Дисертації з теми "Fluidised bed pyrolyser"
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Chodak, Jillian. "Pyrolysis and Hydrodynamics of Fluidized Bed Media." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32920.
Повний текст джерелаMaster of Science
Jendoubi, Naoufel. "Mécanismes de transfert des inorganiques dans les procédés de pyrolyse rapide de la biomasse : Impacts de la variabilité des ressources lignocellulosiques sur la qualité des bio-huiles." Thesis, Vandoeuvre-les-Nancy, INPL, 2011. http://www.theses.fr/2011INPL062N/document.
Повний текст джерелаBiomass fast pyrolysis is a promising process for the preparation of bio-oils dedicated to energy production. Inorganic species originally present in biomass are known to induce problems such as bio-oil instability, deposits and fouling. The purpose of the present work is to better understand the mechanisms of inorganic species transfer from biomass to bio-oils in fast pyrolysis processes. A methodology is developed for quantifying alkali and alkali-earth species (K, Ca, Mg, Na) distribution in the products (chars and bio-oils) issued from wheat straw and beech wood fast pyrolysis. Two complementary devices are used: a pilot plant fluidized bed reactor, and a horizontal tubular reactor. Mass balances closures are accurately achieved. 99 wt.% of the inorganic species originally contained in biomass are recovered in the chars. Thanks to an original bio-oils fractional condensation device, it is shown that more than 60 wt.% of the inorganic content of overall bio-oil is contained in the aerosols. Different assumptions of possible origins of the aerosols are discussed. Inorganic content of bio-oil is strongly connected to the presence of fine chars particles which are not efficiently separated by the cyclones, and, hence recovered in the bio-oils. The possibilities of upstream or downstream treatments are discussed in order to lower inorganic content of bio-oils. Finally, the mechanisms of inorganics transfers between char particles and a liquid phase, during bio-oil storage, are quantitatively described on the basis of side experiments associated to a model
Mohamed, M. "Fluidised bed gasification and pyrolysis of woodchips." Thesis, University of Leeds, 1989. http://etheses.whiterose.ac.uk/21074/.
Повний текст джерелаKessas, Sid Ahmed. "Etude expérimentale de pyrolyse et de vapogazéification des boues de STEP en réacteurs à lit fluidisé entre 700 et 900°C : comparaison avec les déchets boisés." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0113.
Повний текст джерелаThe gasification of lignocellulosic biomass is viewed as a promising technological solution for theproduction of a high value-added gas that could be used in several applications. However,emerging tensions in the wood market are prompting industrial actors to turn to otherlignocellulosic resources, such as agricultural residues, municipal green waste and sewage sludge(SS). Depending on the case, these wastes are considered as effluents with a zero or negativecost. The objective of this work is to better understand and model the phenomena that occurduring the gasification of sewage sludge and green wastes in a fluidized bed. Firstly, aphysicochemical and textural characterization study of the selected fuels and their chars resultingfrom their rapid pyrolysis as well as a kinetic study on the influence of the pyrolysis temperatureand the nature of solid fuel on the reactivity of char were presented. Then, the results obtainedduring the pyrolysis and steam gasification of wastes, in a fluidized bed gasification pilot plant, arepresented for temperatures ranging between 700 and 900 °C. Parametric studies allows to betterunderstand the effect of operating parameters (temperature, H2O/fuel mass ratio, the nature of thefuel and the kind of the fluidized medium) on the gasification performance and to identify the keyparameters that control the composition, as well as the syngas production yield. Moreover,reaction schemes are proposed based on the experimental results, for the pyrolysis of wastesbetween 700 and 900 °C. Finally, the results of a modelling study of the gasifier, integrating thereactions of pyrolysis, char steam gasification, water-gas shift and tar reforming are presented andcompared to the experimental results in order to better understand the effect of the operatingparameters on the conversion rate of different reactions
Urban, Brook John. "Flash Pyrolysis and Fractional Pyrolysis of Oleaginous Biomass in a Fluidized-bed Reactor." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1431105367.
Повний текст джерелаDe, la Rey Jandri. "Energy efficiency in dual fluidised bed fast pyrolysis." Diss., University of Pretoria, 2015. http://hdl.handle.net/2263/57516.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2015.
tm2016
Chemical Engineering
MEng
Unrestricted
Bamido, Alaba O. "Design Of A Fluidized Bed Reactor For Biomass Pyrolysis." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535372231547049.
Повний текст джерелаMatta, Johnny. "Biomass Fast Pyrolysis Fluidized Bed Reactor: Modelling and Experimental Validation." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35516.
Повний текст джерелаBurton, Alan Hamilton. "Bed agglomeration during biomass fast pyrolysis in a fluidised bed reactor." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/1885.
Повний текст джерелаChern, Jyuung-Shiauu. "The pyrolysis and devolatilisation of coal in a fluidised bed." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627146.
Повний текст джерелаBoukis, Ioannis P. "Fast pyrolysis of biomass in a circulating fluidised bed reactor." Thesis, Aston University, 1997. http://publications.aston.ac.uk/9596/.
Повний текст джерелаMellin, Pelle. "Pyrolysis of biomass in fluidized-beds: in-situ formation of products and their applications for ironmaking." Doctoral thesis, KTH, Energi- och ugnsteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172293.
Повний текст джерелаJärn och stålindustrin stod för 8 % av alla koldioxidutsläpp i Sverige, 2011. Alternativa energibärare undersöks i denna avhandling. Genom pyrolys av biomassa, fås en energirik fast produkt, och samtidigt en gasformig och en vätskeformig produkt (bio-olja). Om en fluidbäddsreaktor används kan största möjliga mervärde tillföras de kombinerade produkterna. Djupare förståelse för pyrolys i fluidbäddar har eftersträvats med hjälp fluiddynamikberäkningar (CFD) och detaljerade kinetikscheman. Den fasta produkten har undersökts som bio-injektion i masugnar. En ny approach för modellering av primär och sekundär pyrolys separat, har utvecklats i denna avhandling. En biomassapartikel avflyktigas under pyrolys. Primär pyrolys är nedrytningen av den fasta biomassan till intermediärer (flyktiga ämnen) som kan lämna partikeln. Sekundärpyrolys är nedbrytning av dessa flyktiga ämnen, som primärt sker i gasfas. Primärpyrolysen (i detta arbete, 35 ämnen och 15 reaktioner) sker mestadels i bäddzonen och därmed behöver modellen ta hänsyn till den komplexa fysiska interaktionen av biomassapartiklarna med fluidbäddsmediet (sand) och fluidiseringsgasen. Detta åstadkoms med hjälp av Euleriska faser och interaktionstermer, samt en lösare för hantering av styva reaktionssystem. Sekundärpyrolysen sker huvudsakligen utanför bäddzonen. Fluiddynamiken är enklare men kemin är mer komplex, med fler ämnen närvarande. Att tidseffektivt köra beräkningarna, för sekundärpyrolysen (134 ämnen, 4169 reaktioner) åstadkoms med hjälp Dimensionsreducering, Kemiagglomerering och In-situtabulering (ISAT); som implementerats i en sannolikhetstäthetsfunktion (PDF). En analys av de numeriska beräkningarna antyder att de kan matchas med experimentella resultat, med avseende på tryckprofil, temperaturprofil, utbyte av gasformiga, fasta och vätskeformiga produkter. Dessutom, med några undantag, kan beräkningarna matchas ganska väl med de viktigaste gasformiga produkterna. Därmed kan de huvudsakliga fysiska och kemikaliska mekanismerna representeras av modellen men förbättringar är givetvis möjliga. En parameterstudie av reaktionsatmosfärer (dvs fluidiseringsgaser) genomfördes, för att förstå processen bättre. Modellen visade på betydande effekter av atmosfären, fysisk (både under primär och sekundärpyrolys), och kemiskt (under sekundärpyrolysen). Under primärpyrolysen undersöktes den fysiska inverkan av reaktionsatmosfärer (N2, H2O). När ånga jämfördes med kvävgas, visade det sig att värmeflödet sker mer homogent på både bäddnivå och på partikelnivå, med ångatmosfär. Under sekundärpyrolysen, så antyder resultaten på att turbulensinteraktion spelar en viktig roll för accelererad oönskad sekundärpyrolys av de vätskebildande ämnena. Ånga som är en av de undersökta atmosfärerna (N2, H2O, H2, CO, CO2), resulterade i den lägsta omfattningen av sekundärpyrolys. Dock så ledde en ångatmosfär varken till den lägsta residenstiden, den lägsta peaktemperaturen eller den lägsta radikalkoncentrationen; som alla normalt motverkar sekundärpyrolysen. Ett repeterat case, med hög turbulens i inloppet, gav betydande sekundärpyrolys av de vätskebildande ämnena. Attraktiviteten av approachen är given men mer testning och utveckling behövs, som också påkallats av andra forskare. Den fasta produkten efter pyrolys kallas träkol. Angående dess applicering i masugnar, så visar modelleringsresultaten att full substitution av fossilt kol går att göra. Betydande minskningar i koldioxidutsläpp är därmed möjliga. Energibesparingar är dessutom möjligt, tack vare det höga syreinnehållet i träkol (och biobränslen generellt), vilket ger större volymer av masugnsgas med högre värmevärde (och mindre sensibel värme som inte är utvinnbar). Energibesparingar är möjliga även om hänsyn tas till högre eleffekt för syrgasanrikning i blästerluften och en högre injektionsåtgång på energibasis. En översikt över biomassatillgången och existerande teknikleverantörer i Sverige, indikerar att all injektion i Masugn 3 (i Luleå) kan ersättas med biomassa. Baserat på statistik från 2008, så kan ersatt kol med träkol, minska de platsspecifika koldioxidutsläppen med 28.1 % (eller 17.3 % av alla utsläpp från stålindustrin). Som jämförelse kan torrifierad biomassa and obehandlad biomassa reducera utsläppen med 6.4 % respektive 5.7 %.
QC 20150827
Agarwal, Gaurav. "Solid Fuel Blend Pyrolysis-Combustion Behavior and Fluidized Bed Hydrodynamics." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51677.
Повний текст джерелаPh. D.
Wiggers, Vinicyus Rodolfo. "Simulação, projeto e construção de uma unidade piloto multi-proposito para pirolise de residuos." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267412.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: A pirólise, uma das muitas alternativas de processos de conversão química de resíduos sólidos, tem recebido uma atenção especial de ambientalistas, engenheiros e da comunidade científica. Este processo tem sido testado em um número incontável de plantas piloto, e muitos sistemas em escala industrial já são operados com sucesso. Sofrendo aquecimento em uma atmosfera livre de oxigênio, muitas substâncias orgânicas de cadeia longa, podem ser fracionadas via craqueamento térmico e reações de condensação, em frações gasosas, líquidas e sólidas de menor peso molecular com maior valor econômico. Ao contrário da incineração que é altamente exotérmica, a pirólise é endotérmica, ocorre numa faixa de temperatura da ordem de 300 a 600°C e apresenta vantagens como a menor formação de dioxinas e a possibilidade de processo autotérmico. Este trabalho tem o propósito de simular, projetar e construir uma planta piloto de pirólise em reator de leito móvel através de solução de modelos matemáticos e métodos numéricos. Além disso, pretende-se desenvolver uma estratégia do tipo problema inverso para ajuste numérico de parâmetros térmicos e cinéticos do processo. Para tanto, projetou-se e montou-se um aparato experimental em escala piloto, com finalidade multi-propósito, para aquisição de dados do processo com e sem reação, mediante o desenvolvimento e uso do modelo microscópico unidimensional e permanente de conservação da massa e da energia
Abstract: Pyrolysis, one of many solid waste chemical conversion processes, has been receiving a special atenttion from engineers, researches and environment specialists. The pyrolysis has been tested in many pilot plants, and some industrial plants are operated with success. Heating in a controled atmosphere absenced of oxygen, an organic portion of waste materials can be converted into mixture gases, oils with lower molecular weight and others products with higher economic value. This trasnformation occurs through thermal cracking and condensation reaction. Whereas incineration is exothermic, pyrolysis is endothermic and runs in range temperatures from 300 to 600°C. This process still presents some advantages like smaller dioxines formation than the incineration and also the possibility of autothermal operation of the process This work has the propose to simulate, project and build a pilot plant of pyrolysis with a fluidised bed reactor, by using mathematical modelling and numerical methods for simulation of the process It also intends to develop strategies to solve an inverse problem to predict thermal and kinetics parameters of the model from experimental data obtaneid in a pilot plant and a metodology to determine a thermic and kinetic parameters of solid waste. To get this objective, a microscopic model l-D and steady state, of mass and energy conservation was developed, the simulation for design and the construction of an experimental aparatus in a pilot plant scale was realized, to get a process data with and without reaction, to intend a scale-up from process
Mestrado
Desenvolvimento de Processos Químicos
Mestre em Engenharia Química
Christodoulou, Mélina. "Pyrolyse de bois dans les conditions d'un lit fluidisé : étude expérimentale et modélisation." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0200/document.
Повний текст джерелаThis study contributes to the French biomass gasification project: Gaya project. It is a large R&D project financed by ADEME and coordinated by GDF SUEZ. The project GAYA will develop a demonstration platform for a new biomass gasification and methanation process. In this context, our objective is to build a biomass pyrolysis model, representative of the conditions encountered in the fluidized bed gasifier developed in this project. An experimental machine, the vertical image furnace, has been developed to reproduce the heat conditions of the fluidized bed gasifier at 850°C. This experimental model permits to collect all the pyrolysis products for a later analysis. Then, kinetics parameters are determined from both the physico-chemical process and the optimization of experimental results. The thermal cracking of condensable vapours, is studied during the first 300th milliseconds after their ejection from the biomass particle. For this purpose, cracking experiments are led on the experimental machine which combines a tubular pyrolysis reactor and a continuous self-stirred tank cracking reactor. The model developed allows us to represent the biomass pyrolysis introduced in the gasification reactor
Wildegger-Gaissmaier, Anna Elisabeth. "Fluidized bed utilization of South Australian coals." Title page, contents and abstract only, 1988. http://web4.library.adelaide.edu.au/theses/09PH/09phw672.pdf.
Повний текст джерелаAuthier, Olivier. "Etude découplée des phénomènes physicochimiques impliqués dans les réacteurs de gazéification de la biomasse. Application au cas d'un lit fluidisé double." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL015N/document.
Повний текст джерелаAmong the biomass gasification technologies, the dual fluidized bed gasifier may be used to produce a methane-rich syngas. Analysis of all the physicochemical phenomena involved inside the gasifier is difficult because they all occur simultaneously. In this thesis, the main chemical reactions are decoupled and studied independently one of each other at the scale of original laboratory facilities in thermal conditions close to those encountered in the gasifier. Intraparticular reactions of biomass pyrolysis and gas/solid reactions (char-steam gasification and catalytic thermal cracking of vapors on olivine) are carried out with an image furnace. Experiments related to gas-phase vapors thermal cracking are performed inside a continuous self stirred tank reactor. All the products formed by the reactions are recovered and analyzed. Mass balance closures are achieved accurately. Controlling steps of each reaction are discussed on the basis of a characteristic times analysis. Kinetic parameters are determined according to both processes modelings and optimizations from the experimental results. Different ways of possible methane formation and consumption mechanisms are identified and discussed. The gasifier is modelled by considering a single-particle model (primary pyrolysis reactions), secondary reactions, solids and gas-phase hydrodynamics and transfers. Finally, the decoupling methodology is validated from the comparison of model results with measurements performed at the 8 MW Güssing gasifier (Austria)
Antreou, Evangelia. "Improved microwave-assisted pyrolysis of HDPE using catalysts and a fluidised-bed reactor." Thesis, University of Cambridge, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648805.
Повний текст джерелаPapakidis, Konstantinos. "Computational modelling of the fast pyrolysis of biomass in bubbling fluidised bed reactors." Thesis, Aston University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.497372.
Повний текст джерелаGerhauser, Heiko. "CFD applied to the fast pyrolysis of biomass in fluidised beds." Thesis, Aston University, 2003. http://publications.aston.ac.uk/9645/.
Повний текст джерелаWang, Xiaoquan. "Biomass fast pyrolysis in fluidized bed product cleaning by in-situ filtration /." Enschede : University of Twente [Host], 2006. http://doc.utwente.nl/51114.
Повний текст джерелаMiddleton, Stephen Philip. "Partitioning of sulphur and nitrogen in pyrolysis and gasification of coal in a fluidised bed." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/27972.
Повний текст джерелаHung, Jessica Joy. "The Production of Activated Carbon from Coconut Shells Using Pyrolysis and Fluidized Bed Reactors." Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/243968.
Повний текст джерелаCooke, Louise A. "The effect of a ZSM-5 containing catalyst on the fluidised bed fast pyrolysis of pine wood." Thesis, Aston University, 1999. http://publications.aston.ac.uk/9626/.
Повний текст джерелаSilva, Fabio Nascimento da. "Estudo da pirolise de poliamida-12 em leito fluidizado borbulhante." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264085.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: O objetivo do presente trabalho consiste em avaliar a degradação térmica de poliamida-12 obtida como resíduo de processos de prototipagem rápida por via pirolítica para obtenção de produtos líquidos e gasosos que possam ser usados como insumos e para a geração de energia em indústrias. Foram utilizadas diferentes configurações no leito fluidizado, alterando parâmetros de temperatura, velocidade de fluidização e altura do leito de inerte. A poliamida-12 é utilizada em máquinas de prototipagem rápida para confecção de moldes e peças. Após cerca de 250 horas de utilização, o material perde suas características originais sendo, então, descartado. O descarte da poliamida é feito armazenando o material em tambores até que seja elaborada uma solução alternativa. O estudo da pirólise de poliamida-12 apontou que o material é convertido em gás e produto líquido, não sendo gerado resíduo sólido após o processo. O gás gerado possui concentrações consideráveis de H2 e N2. Foi demonstrado que baixas velocidades de fluidização e elevadas temperaturas favorecem a formação de gás, contudo, a altura do leito fixo não influenciou de maneira significativa os resultados. O estudo comprova a aplicabilidade da reciclagem de PA-12 por processos de pirólise, gerando basicamente gás de síntese. Palavras Chave: Poliamida-12, pirólise, reciclagem, pirólise de polímeros
Abstract: The aim of this work is to evaluate the thermal degradation by pyrolysis of polyamide-12 obtained as residue from rapid prototyping processes for generation of liquids and gaseous products that should be used as supplies and to energy generation on industries. Were utilized different bed's configurations, changing parameters as temperature, fluidization air speed and inert bed's height. The polyamide-12 is utilized in rapid prototyping machines for the confection of moulds and pieces. After about 250 hours of utilization, the material loses it original characteristics and it is discarded. The discard of used polyamide has been done by saving the material in gallons until another way be elaborated. The study of pyrolysis of polyamide-12 shown the material conversion into gas and liquid product, without production of solid waste after the process. The gas has considerable concentrations of H2 and N2. It was demonstrated that low fluidized gas speed and high temperatures increases the gas formation, however, the fixed bed height did not have several influence in the results. This study confirms the applicability of PA-12 recycling by pyrolysis processes, generating synthesis gas. Key Words: Polyamide-12, pyrolysis, recycling, polymers pyrolysis
Mestrado
Termica e Fluidos
Mestre em Engenharia Mecânica
Gulshan, Samina. "Fast Pyrolysis of Biomass in a Fluidized Bed for Production of Bio-oil and Upgradation by Ex-situ Catalytic Bed." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254895.
Повний текст джерелаFramställning av bioolja från biomassa är ett av de bästa alternativen som kan ersätta fossilabränslen i transportsektorn. Pyrolys är en av de mest lovande teknologierna för att framställabioolja från biomassa. Bioolja behöver dock uppgraderas på grund av en hög andeloxygenerade föreningar. Katalytisk snabbpyrolys är en effektiv metod för att producera ochuppgradera sådan bioolja, antingen genom in-situ eller ex-situ processuppställning. Denna studie presenterar en experimentell undersökning av snabbpyrolys av lignocellulosiskbiomassa kombinerat med ex-situ katalytisk uppgradering. Processen består av fyra delar:förbereda lämplig partikelstorlek av biomassa, pyrolys, ex-situ fastbädd och kondensering avångor. Pyrolysexperiment har genomförts med vätgas med och utan katalysator för attundersöka utbytet av olika pyrolysprodukter. Resultaten visar att en katalytisk uppgraderingger en ökad andel gasprodukt samt ett lågt utbyte av olja. Stor andel syre avlägsnades från oljansom CO och CO2 genom krackningsreaktioner i den katalytiska bädden. Oljeutbytet var lägrevid katalytiska experiment, men visade ett lovande energivärde pga en minskad andel vattensamt ett lägre syratal. Utbytet av kol var detsamma för katalytiska och icke-katalytiskaexperiment.
Myo, Min Win. "Thermochemical conversion characteristics of gas and tar generation from waste biomass and plastics." Kyoto University, 2020. http://hdl.handle.net/2433/253264.
Повний текст джерелаCadile, Claudia. "Modélisation DEM et approche expérimentale de la dynamique d'un système réactif en lit fluidisé dense : application à la gazéification de la biomasse." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4769/document.
Повний текст джерелаEnergy production from green and renewable resources, such as biomass, are currently experiencinga significant growth. Thermochemical conversion of this biomass by gasification is a process usedfor over a century but still requires significant developments in terms of rentability optimizationand quality improvement of products gases.The work carried out in collaboration between the CNIM company and the IUSTI laboratoryallowed the establishment of a numerical simulation tool to study locally different coupled phenomenaoccurring in a dense fluidized bed gasification reactor. The chosen approach, DEM (DiscreteElement Method), is based on the monitoring of particle packets. The simulation results werecompared to experimental measurements realised in IUSTI and LERMAB laboratories : measuringpressure in a shallow fluidized bed and characterization of pyrolysis reaction with the timetracking of particle density by an innovative method, temperature and the composition of theproducts gases. On a larger scale, the numerical code predictions were compared with velocity,particles mixing and segregation profiles from experimental measurements of the literature. Theobtained numerical results of bi-solid fluidized bed with and without chemical reactions are ingood agreement with the experimental measurements. It helped to highlight the strong couplingbetween hydrodynamic and thermochemical phenomena.This work opens up new perspectives on the experimental plan and numerical simulation whichDEM approach has shown great potential. The extrapolation of the DEM model for the simulationof gasification industrial reactors remains a challenge in terms of computer resources
Arnould, Philippe. "Mise en oeuvre de lits fluidises sous plasma : application a la decomposition de la calcite et modelisation." Paris 6, 1986. http://www.theses.fr/1986PA066009.
Повний текст джерелаLe, Dirach Jocelyn. "Contribution à l'industrialisation d'un procédé de gazéification." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL024N.
Повний текст джерелаDiversification of energy sources based on renewable energies must contribute to reduce the share of fossil fuels in power generation, in agreement with the European directives which impose to France to generate 21% of its energy from renewable energies before 2010.The present work reported in this manuscript focus on the industrialization of a wood gasification process for the production of heat and electricity. Experiments of wood fast pyrolysis were performed under various experimental conditions (flux density between 0.9 and 6.3 MW/m2, moisture between 0 and 60%) for understanding and analysis of fundamental phenomena related to the gasification of wood. The various products (char, condensible vapours and gases) are recovered and analyzed. The results help to determine the yields of each of the products for various experimental conditions.The numerical modeling of wood pyrolysis phenomena has been achieved on the basis of kinetic data found through literature review and then compared to the experimental results. Even if there is no perfect agreement, orders of magnitude are respected. These models are used as a basis to develop a gasification reactor model for Güssing DFB reactor, including the hydrodynamics description, wood pyrolysis, char gasification, vapours and gases reactions. This model is used to determine the efficiency of the reactor and its various operating parameters
Mesa, Perez Juan Miguel. "Testes em uma planta de pirolise rapida de biomassa em leito fluidizado : criterios para sua otimização." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/257207.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola
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Resumo: Neste trabalho são apresentados e discutidos testes experimentais conduzidos na planta de pirólise rápida de biomassa da Unicamp visando à operação estável do reator de leito fluidizado em regime borbulhante. Esses resultados permitiram identificar os principais problemas relativos à operação do reator, assim como analisar as possíveis causas e as soluções postas em prática. O problema de maior influência sobre o trabalho estável do reator foi o vazamento de gases da pirólise pelo sistema de alimentação, mostrando-se como solução mais eficaz, o aumento da porcentagem de preenchimento da rosca alimentadora com biomassa. Após a estabilização da operação do reator, estudou-se a influência da porcentagem de ar em relação ao estequiométrico e da altura do leito fixo de inerte sobre as características de qualidade e rendimento dos finos de carvão. O estudo permitiu concluir que, para 8% de ar em relação ao estequiométrico e 207 mm de altura do leito fixo de areia, a pirólise acontece de forma mais intensa. Essa análise parte do princípio de que a pirólise é um processo de concentração de carbono nos finos de carvão e liberação de oxigênio da biomassa. Tomando-se como base os resultados anteriores, foram conduzidos novos testes visando à coleta e caracterização de amostras de bio-óleo. Os resultados mostraram que tanto a viscosidade quanto o teor de insolúveis das amostras de bio-óleo apresentaram altos valores, quando comparados com dados da literatura. Com base na experiência acumulada dos estudos anteriores é proposta e parcialmente avaliada uma estratégia para a otimização e a mudança de escala do processo de pirólise em leito fluidizado. A estratégia objetiva o uso das informações obtidas a partir dos modelos matemáticos ajustados no reator modelo para o projeto de reatores comerciais. O procedimento anterior mostra-se eficiente quando os fatores independentes e seus níveis durante a otimização do processo no reator modelo são criteriosamente selecionados. Finalmente, são mostradas, por meio de um exemplo, as dificuldades durante a mudança de escala quando os experimentos realizados no reator modelo não são planejados com o objetivo de reduzir as distorções na escalada
Abstract: This research discusses a strategy to optimize and scale up the pyrolysis process in fluidized bed. The strategy uses adjusted mathematical models applied to the model reactor to the project commercial reactors. Several steps of that procedure were appraised based on the adjusted model for the percentage of elutriated fine charcoal in the model reactor. It was verified that, during the scale-up, the mathematical model was not effective; however it predicts problems associated to the change of scale. Exploratory tests were carried out to guarantee the stable operation of the reactor, which made possible the identification of the main problems related to the procedure during the fast pyrolysis in fluidized bed with atmospheric air. The possible causes of the problems, as well their solutions, are also analyzed. The greater difficulty in the operation was the leak of pyrolitic gases through the feeding system. The increase of the percentage of biomass stuffing of the feeding thread was the most effective solution to avoid gas leaking. When the reactor operation was stabilized, the influence of the percentage of air in relation to the stoichiometric and the height of the inert fixed bed on the quality characteristics and yield of the fine charcoal. That study allowed conclude that, for 8% of air in relation to the stoichiometric and 207 mm of the fixed sand bed height, the pyrolysis happens in a more intense way. The analysis was based on the principle that the pyrolysis process is a process to concentrate carbon in charcoal and release oxygen from the biomass. Finally, bio-oil samples were collected using a centrifugal separator and characterized. The viscosity and the insoluble content presented high values, when compared with the literature data. Based on those results, a system to bio-oil recovery was projected and built. It combines the direct contact followed by centrifugal separation
Doutorado
Construções Rurais e Ambiencia
Doutor em Engenharia Agrícola
Camargo, Fernando de Lima. "Estudo da pirolise rapida de bagaço de cana em reator de leito fluidizado borbulhante." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264132.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: O conteúdo de energia da biomassa pode ser explorado por combustão direta ou outros processos de conversão: físicos, biológicos e termoquímicos. Entre os processos termoquímicos há a pirólise que é atrativa devido à conversão de biomassa sólida para produtos líquidos apresentando algumas vantagens tais como no transporte, no armazenamento, na manufatura, reprocessamento e flexibilidade na produção. O objetivo deste trabalho foi construir e operar um reator de leito fluidizado em escala de bancada com alimentação contínua de biomassa para converter o bagaço de cana de açúcar em líquidos via pirólise rápida. O reator construído tem 0,095 m de diâmetro interno e foi utilizado areia fina como material inerte. Foi desenvolvido um novo alimentador para controlar a alimentação contínua de biomassa no leito e um sistema isocinético de amostragem com o objetivo de quantificar os produtos gerados no processo. Uma metodologia experimental foi escrita para a realização de testes de pirólise rápida de biomassa. Experimentos foram realizados usando catalisadores de craqueamento de petróleo (FCC) e injeção de água no fluxo para avaliar a influência destes fatores no processo. Temperatura e altura estática do leito também foram consideradas neste estudo. A altura estática do leito e a temperatura foram as variáveis mais relevantes na maioria dos testes realizados e necessitam de atenção especial na conversão para produtos líquidos
Abstract: The energy content of biomass can be exploited by direct combustion or after conversion by physical, biological and thermochemical processes. Among the thermochemical processes there is the pyrolysis that is an attractive process because it provokes the conversion of solid biomass into liquids products. Such conversion presents many advantages in transport, storage, handling, retrofitting, combustion and flexibility in production and marketing. The goal of this work was to build and operate a bench scale fluidized bed reactor to convert sugarcane bagasse into liquid products by fast pyrolysis. The reactor design presents 0,095 m internal diameter and fine sand was used as inert material for the fluidized bed. A new hopper to control the continuous feed of biomass in the reactor and an isokinetic sampling device to quantify the products obtained in the process. An experimental methodology was written for tests with biomass. Experimental essays carried out with fluid catalytic cracking and water injection in the stream in order to verify these effects in the process. Temperature and static height of the bed was also considered in this study. The static height of the bed and the temperature were the variables more important, requiring special attention in the conversion process
Doutorado
Termica e Fluidos
Doutor em Engenharia Mecânica
Borges, Fernanda Cabral. "Estudo do processamento termoquímico de biomassas com micro-ondas : pirólise rápida de biomassas residuais e microalgas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/100151.
Повний текст джерелаSome concepts of biorefineries are based on thermochemical processes and fast pyrolysis is one of the most promising of these processes. The fast pyrolysis products are biooil, fuel gas and char, with typical distribution of 50:30:20 in weight basis. The bio-oil is the main product, and it can be directly used as fuel, or post-processed in order to obtain higher value added chemicals. The microwave heating, widely used in green chemistry, begins to be studied as an alternative heating. However the yields achieved in bio-oil are lower than those obtained by the conventional fast pyrolysis, mainly due to its low heating rates. To solve this problem this thesis is proposing the use of microwave absorbers to improve the heating process, and that also allow semi-continuous and continuous feeding of biomass to the process. The use of fluidized bed and catalysts can be integrated into this concept. The fast pyrolysis conditions are achieved due to increased heating rate of biomass, which becomes heated in a hybrid way by heat conduction mechanism from heated microwave absorbers, and directly through the dielectric heating from microwaves. The increase in heating rates results in higher reaction rates, allowing higher yields of bio-oil. This concept has been experimentally tested in a bench scale unit for processing waste biomass and microalgae using silicon carbide (SiC) as a microwave absorber. High heating rates were observed, the heated biomass and the volatiles were removed from the reactor almost instantaneously. A maximum bio-oil yield of 65% and 64% was obtained for wood sawdust and corn stover, respectively. The same system was used to test the catalytic fast pyrolysis. Microalgae were processed with and without the presence of HZSM-5. Yields of 57% and 59% of bio-oil were achieved for Chlorella sp. and Nannochloropsis, respectively. Higher yields of bio-oil were observed compared to the literature. These results suggest that the concept of fast microwave-assisted pyrolysis is technically feasible, requiring further studies to demonstrate its economic viability.
Saghir, Muhammad. "A novel pyroformer system for biomass intermediate pyrolysis with in-situ char-promoted reforming (by char re-circulation) of pyrolysis vapours and potential integration of pyroformer with commercial scale fluidised bed gasifier to enable pyrogasification." Thesis, Aston University, 2018. http://publications.aston.ac.uk/37694/.
Повний текст джерелаRasol, Hepa. "Influence of Potassium on Gasification Performance." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10350.
Повний текст джерелаHsu, Chen Pei, and 許晨霈. "A study of rice husk fast pyrolysis in a bubbling fluidized bed pyrolyzer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/03296721485500609001.
Повний текст джерелаSwart, Stephen David. "Design, modelling and construction of a scalable dual fluidised bed reactor for the pyrolysis of biomass." Diss., 2012. http://hdl.handle.net/2263/29849.
Повний текст джерела- A literature study was done in order to obtain a theoretical foundation for the current project.
- A novel dual fluidised bed reactor system was designed, which included the block flow diagram and the process and instrumentation diagram for the system.
- A cold unit of the system was built in order to test the performance of the system.
- A comprehensive model for the system was developed, which included mass and energy balance considerations, hydrodynamics and reaction kinetics.
- A complete pilot-scale system of the proposed design was built and tested at the University of Pretoria.
- The current research offers the opportunity for the forestry sector to shift its focus from the production of traditional wood products, such as pulp and paper, to products such as specialised chemicals.
- The bio-oil produced in the dual fluidised bed system can be upgraded to renewable liquid fuels, which may help reduce the dependence of the infrastructure on fossil fuels.
- The dual fluidised bed system provides an opportunity for capturing and removing CO2 from the atmosphere in the form of bio-char. It is therefore considered to be a carbon-negative process, and may help reduce the concentration of greenhouse gases.
- The bio-char produced in the dual fluidised bed system can be used to feed nutrients back to plantation floors in the forestry sector, thereby aiding the growth of further plantations.
Dissertation (MEng)--University of Pretoria, 2013.
Chemical Engineering
unrestricted
Grobler, Arthur Bachelor Lofté. "Scalable dual fluidised bed system for fast pyrolysis of woody biomass." Diss., 2015. http://hdl.handle.net/2263/43758.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2015.
Chemical Engineering
MEng
Unrestricted
Lee, Ying Tso, and 李盈作. "Pyrolysis of Polyethylene and Polypropylene in a Fluidized Bed." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/19853088356384125106.
Повний текст джерела逢甲大學
化學工程研究所
82
While growing numbers of plastic waste creating disposal problem,the recycling of plastic waste is getting important topic. The major plastic waste in Taiwan are LDPE,HDPE,PP,PVC, PS,and ABS.The amount of plastic is about one million tons per year and 410,000 tons of total plastic waste may recycle,reuse ,or resourse. From energy view point,it is also evident that the pyrolysis make plastic waste more resources recovery than the others,such as combustion,landfill ,...etc.. The experimental work was carried out in a bubbling fluidized bed which consist of a perforated distributor,and with a stainless column of 100cm bed height(10cm ID),and 100 cm in freeboard(25 cm ID). The polyethylene and the polypropylene are converted into gas,oils,and char by pyrolysis in various temperature and two different catalysts. The experimental temperature was controlled initially by electrical heating,then by autothermal reaction.The autothermal pyrolysis is a physical and chemical conversion process. According to the selected operating parameters,the conversion proceeds either by gasification,by liqquefaction, or by combustion. In this study we found that the product compostion was affected by temperature,heating rate, airfactor and catalyst.
Chiou, Yue-Han, and 邱約翰. "Fast Pyrolysis of Woody Biomass in a Fluidized Bed." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/30052670536754692760.
Повний текст джерела國立中興大學
森林學系所
98
Fast pyrolysis is a thermochemical process in which biomass is rapidly heated in the absence of oxygen. Fast pyrolysis of biomass is one of the most promising technologies for converting biomass into liquid fuels. In this study, a 30 kWth bubbling fluidized bed reactor operating with an inert atmosphere was employed to produce bio-oils from the woody biomass such as Dimocarpus longan and Swietenia macrophylla. The kinetics of the pyrolysis of woody feedstocks using thermogravimetric analysis were examined. Also the effects of operating conditions, such as superifical gas velocity, feeding rate, pyrolysis temperature, freeboard temperature and temperature of cooling water on the bio-oil yield from fast pyrolysis of woody feedstocks with/without bark were investigation. The results show that the activation energy of Dimocarpus longan and Swietenia macrophylla are 48.70 kJ mol-1 and 56.23 kJ mol-1, respectively. The bio-oil yield increased with decreasing the gas velocity and freeboard temperature, but with increasing the feeding rate. The optimal pyrolysis temperature for the production of bio-oil was 500oC, and the highest bio-oil yield is 36.91 wt.%. However, The bark of woody biomass would lower the bio-oil yield. In addition, the water content of bio-oil increased with increasing the pyrolysis temperature. Moreover, the HHV on dry basis of bio-oil is between 34-49 MJ kg-1, and the char yield is about 24 wt.%. It can also be found that the yields of syngas, CO and CH4, increased with increasing the pyrolysis temperature, but CO2 content shows the contrary results.
Jyun-JchinJhan and 詹峻智. "system development and product analysis for the fluidized bed fast pyrolysis." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/gp4x24.
Повний текст джерела國立成功大學
航空太空工程學系
105
In this study, both system development and experimental investigation were conducted for fluidized bed fast pyrolysis. The design of a fluidized bed pyrolysis system, including a fluidized bed reactor, a feeder, a cyclone and a condenser, was carried out in order to improve the system performance and efficiency. Rice husk was chosen as the feedstock based on its availability in Taiwan. The product distributions from fluidized bed pyrolysis were studied with varying temperature, carrier gas flow rate and biomass feeding. The results showed that the optimal experimental conditions for obtaining the maximum bio-oil yield were at the temperature between 400 ℃ and 450 ℃ , the flow rate of 45 L /min and biomass feeding of 21.3 g per inject time. The analysis of GC-MS indicated that the major components of bio-oil contain n-hexadecanoic acid, octadecaoic acid, 9-octadecenoic acid and decanoic acid. The element and property analysis of bio-oil demonstrated that the bio-oil has high oxygen content and low heating value. The analysis of GC-TCD showed that the major components of non-condensable gas are CO2, H2, CH4 and N2.
Firdaus, Ahmad Hanif, and 歐識賢. "Fast Pyrolysis of Palm Kernel Shell Biomass in Fluidized Bed Reactor." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/g6t9ga.
Повний текст джерела國立中央大學
機械工程學系
102
ABSTRACT In this thesis, palm kernel shell (PKS) biomass are pyrolyzed in a fast pyrolysis system using fluidized bed reactor and ceramic balls as fluidizing medium, with CO2 as fluidization gas. The purpose of this research is to find the effect of operating parameters, such as reactor temperature (350º - 550ºC), fluidizing gas flow rate (5-15 liter/min) and heating rates (1, 5, 10 K/min) on the yield of each pyrolysis product (bio-oils, gas, and char). The composition of PKS biomass and their product are investigated according to ASTM (American Society for Testing and Materials) standard methods. The result shows that the maximum bio-oil yield is 20.4 wt.%, occurred at 500ºC and the flow rate of CO2 is 10 liter/min, the other product are char with 36.0 wt.% and gas with 43.6 wt.%. Char decreases with increasing reactor temperature and CO2 flow rate. A opposite, the gas product increases with increasing reactor temperature and CO2 flow rate above 10 liter/min. From TG (thermogravimetry) and DTG (differential thermogravimetry) analysis, the weight loss are generally divided into 3 parts. First, occurred from 100ºC to 220ºC, presented the moisture and extractive evaporations. The second weight loss occurred at 240ºC - 400ºC, the thermal decomposition of cellulose and hemicellulose and the third, the weight loss above 400ºC until 900ºC is mainly due to the decomposition of lignin. The DTG curves have two peaks. The first peak is assigned to devolatilization of hemicellulose, while the second peak is cellulose. The effects of the heating rate on the DTG curve and maximum decomposition rate are investigated. At higher heating rates, individual conversions are reached at higher temperatures. For the heating rate of 1 K/min, the first and second peak occurred at 280 ºC and 380ºC. For 5 K/min, they occurred at 305 ºC and 390 ºC. They occurred at 310 ºC and 405 ºC for 10 K/min. The maximum of the decomposition rate is also slightly shifted towards higher temperature. CHNO content of bio oils are 67.70 wt.%, 9.70 wt.%, 0.90 wt.%, and 21.70 wt.%, respectively. Bio-char have high carbon content, around 62.87 wt.%, other elemental compositions are 2.54 wt.% of hydrogen, nitrogen with 0.56 wt.%, 0.01 wt.% for sulfur, and oxygen with 10.80 wt.%. Proximate analysis of PKS bio char gets 23.18 wt.% of ash, 3.30 wt.% of moisture, also HHV, volatile matter, and fixed carbon with 23.56 MJ/kg, 17.86 wt.%, and 58.96 wt.%, respectively. When using CO2 utilized as fluidization gas, the gas product has compositions similar to previous study, and consists mostly of CO2 (Over 50 vol.%), followed by CO, and little amount of CH4 and H2. Keywords: Biomass, palm kernel shell, fast pyrolysis, bio-oil
Luo, Cheng Xin, and 駱呈欣. "Operating parameters of autothermal pyrolysis of plastic waste in a fluidized bed." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/07044592163214159701.
Повний текст джерелаJalalifar, S. "Operational management of fast pyrolysis process using numerical modelling." Thesis, 2020. https://eprints.utas.edu.au/35036/1/Jalalifar_whole_thesis.pdf.
Повний текст джерелаMOUDGALYA, KANNAN MANI. "EFFECTIVE DIFFUSIVITIES IN CHAR PARTICLES (DIFFUSION, FAST FOURIER TRANSFORM, PYROLYSIS, COAL, FLUIDIZED BED)." Thesis, 1985. http://hdl.handle.net/1911/15925.
Повний текст джерелаTseng, Cheng-Wei, and 曾正偉. "Fast pyrolysis of rice husks in a fluidized-bed for bio-oil production." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/vj34qp.
Повний текст джерела國立中央大學
能源工程研究所
105
The research can be discussed in two aspects, including fluidizing condition-liquid yield and pyrolysis condition-chemical analysis. Firstly, the main factor that affects minimum fluidizing velocity (umf) is particle size. When gas velocity falls on 2.33 umf, average oil yield is about 20wt.% which is better than other values, and the pH value is higher, which means bio-oil is hard to second-react with acidic matters in it. Temperature doesn’t have many things to do with fluidizing pressure drop as the value of each size keeps the same; When particle size falls on 0.40mm, there is the best yield of all, 32.18 wt.%. And carbon conversion rate is also higher as acidity is weaker. C, H, O three elements take the majority in bio-oil. For C, is about 20wt.%, for H, is about 10-15wt.%, for the rest part is O as N and S are very few. Secondly, at 500℃, there are higher oil-yield of 23wt%-32wt%, and so as HHV, the best one is 7254.1kcal/kg. And acidity is weaker while conversion rate is better. For the reason that TGA analysis models of biomass in heating mode have been set up by some researchers while isothermal mode haven’t and needs shorter time to reach steady temperature, this research use isothermal mode to test the thermal-gravimetric loss of biomass observe the properties of pyrolysis, and calculate the pyrolysis dynamic parameters. The chemicals that have apparent area concentration in bio-oil are Acetic anhydride, 1,2-benzenediol, 2-methylphenol and phenol. Finally, consider those correlation coefficients, the fluidizing pressure drops are negatively related to oil yields. When pressure drops get smaller, closer to 2 umf, the oil yields get higher, which means that the minimum bubbling velocity, umb, is quite close to 2umf ; In chemicals contained in the oil, 2-hydroxyl-3-methyl-2-cyclopenten-1-one is dominant in carbon content, HHV and pH value, and is positively related to them; Meanwhile, acetic anhydride and toluene are negatively related to carbon content, HHV, carbon conversion rate; 4-methylphenol is highly positively related to carbon conversion rate.
Chang, Ching Houng, and 張錦煌. "Recycling of Scrape Tires to Oil and Carbon Black by Pyrolysis in a Fluidized Bed." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/58904883617818651905.
Повний текст джерела逢甲大學
化學工程研究所
82
With growing number of car and motorcycle, waste tire re- cycling has become a necessity because of the huge piles of tires that represent a threat to the environment. The used tires represent a source of energy and valuable chemical pro- ducts. Pyrolysis can make tires a decent fuel for utilities. Comparing with incineration, landfill and retreading, pyrolysis is a more suitable and economical way to deal with used tires. In our experiments,a laboratory-scal fluidized bed was used to pyrolysis scrapp tires,controlled by limited air supply. For searching the best operational condiction, bed material size, feed material size,and gas velocity were concerned. the compo- sitions and properties of the pyrolytic oils and solid were de- termined in relation to pyrolysis temperatureup up to 843K. The experimental work was carried out initially by electrical heating, then by autothermal reaction. The experimential results was found that without external heating, pyrolysis could carry out by partial combusition and auto thermal cracking, temperature was affected by airfactor, temperature had a significant influence on the composition of products, and the yield of gasoline was affected by zeolite. The scrap tires produced approximately 29% oil,16% gas,20% char 15% water .
Chiu, Cheng-wei, and 邱正瑋. "Fabrication of nano-TiN powder by pyrolysis conversion of TiO2 in a fluidized bed furnace." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/06311054698068321555.
Повний текст джерела大同大學
材料工程學系(所)
92
Nano-structure TiN powders were prepared by using anatase-TiO2 and graphite mixtures as the precursor. Prior to thermal conversion, the mixture of TiO2 and graphite was milled in a high energy attritor to enhance the validity of carbothermic reduction. The nano-TiN powders were thermal converted by introducing N2 into a low pressure circulated fluidized-bed reactor which was previously evacuated to the pressure around 10-1 torr The formation of TiN compound is greatly enhanced by high-energy milling due to the reduced crystallite size, large grain boundary area, presence of amorphous phases and the increased defect concentration in the powder reactants given by the high-energy milling. Crystallites size of the powder mixtures decreased as increasing of milling time. The nano-TiN formation can be accomplished at a relatively low reaction temperatures and short reaction time via severe milling of TiO2 + graphite mixtures. The experiment results evidenced that the carbothermic reduction could not be occurred if the powder mixture of TiO2 + graphite had not been undergone a severe milling
SUARSANA, PURNA ANUGRAHA, and 安普納. "ANALYSIS OF FAST PYROLYSIS PHENOMENA IN FLUIDIZED BED REACTOR OF PALM KERNEL SHELL (PKS) BIOMASS." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/08981004855078481402.
Повний текст джерела國立中央大學
機械工程學系
102
The fast pyrolysis phenomena in fluidized bed reactor of Palm Kernel Shell such as the effect of temperature fluidization gas, velocity fluidization gas and mass flow rate of biomass on product yield of fast pyrolysis PKS biomass were investigated based on the Euler-Euler approach in this work. The temperature of fluidization is varied of 723, 743 and 763K. The velocity of fluidization gas is varied of 0.059, 0.088 and 0.117 m/s. The mass flow rate is varied of 2.42, 3.63 and 4.84 g/s. Result of CFD simulation studies is: the temperature of fluidization gas, velocity of fluidization gas and mass flow rate of biomass is effect on product yield of fast pyrolysis PKS Biomass. The increasing temperature of fluidization gas is lead to increasing of mass fraction tar and decreasing of mass fraction char and gas. At temperature 763K, the mass fraction of tar is 49.26%, mass fraction of char and gas are 27.78% and 22.96%. The increasing velocity of fluidization gas is lead to increasing tar and decreasing mass fraction of char and gas until velocity of 0.088m/s, after that the trend of product yield fast pyrolysis is vice versa. At velocity 0.088m/s, the mass fraction of tar, char and gas are 50.09%, 27.06% and 22.86%. The increasing mass flow rate of biomass is lead to increasing the mass fraction of tar and decreasing mass fraction of char and gas. At the mass flow rate 4.84 g/s, the mass fraction of tar, char and gas are 50.36%, 26.89% and 22.77%. Keywords: Fast pyrolysis, PKS biomass, fluidized bed, product yield
An-ChengLee and 黎安成. "Fluidized Bed Fast Pyrolysis of Miscanthus and Hydro-processing for Upgrading the Produced Bio-oil." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/37ak8z.
Повний текст джерела