Gotowe bibliografie tematyczne / Pyrolysis Mathematical models

Gotowa bibliografia na temat „Pyrolysis Mathematical models”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 29 stycznia 2023

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Artykuły w czasopismach na temat "Pyrolysis Mathematical models"

Hernowo, Pandit, Carolus B. Rasrendra, Yogi W. Budhi, Jenny Rizkiana, Anton Irawan, Septhian Marno, Yana Meliana, Oki Muraza i Yazid Bindar. "Volatile State Mathematical Models for Predicting Components in Biomass Pyrolysis Products". Journal of Engineering and Technological Sciences 54, nr 1 (2.02.2022): 220108. http://dx.doi.org/10.5614/j.eng.technol.sci.2022.54.1.8.

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Volatile state mathematical models for quantifying the chemical components in volatile biomass pyrolysis products were developed. The component mass yield Yi rate depends linearly on its pseudo kinetic constant and the remaining mass yield. The mass fraction rate of each component was modeled from the derivation of its mass yield rate equation. A new mathematical model equation was successfully developed. The involved variables are: biomass number, temperature, heating rate, pre-exponential factor, and pseudo activation energy related to each component. The component mass fraction yi and the mass yield were predicted using this model within a temperature range. Available experimental pyrolysis data for beechwood and rice husk biomass were used to confirm the developed model. The volatile products were separated into bio-pyrolysis gas (BPG) and a bio-pyrolysis oil (BPO). Five components in the BPG and forty in the BPO were quantified. The pseudo activation energy for each pseudo chemical reaction for a specific component was modeled as a polynomial function of temperature. The component mass fraction and yield are quantifiable using this developed mathematical model equation within a temperature range. The predicted component mass fractions and yields agreed excellently with the available experimental data.

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Khaghanikavkani, Elham, i Mohammed M. Farid. "Mathematical Modelling of Microwave Pyrolysis". International Journal of Chemical Reactor Engineering 11, nr 1 (31.10.2013): 543–59. http://dx.doi.org/10.1515/ijcre-2012-0060.

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Abstract This study deals with a detailed numerical investigation of the microwave heating process in plastic pyrolysis. The pyrolysis of high-density polyethylene (HDPE) was studied using a single-mode microwave cavity, TE10 mode, at 2.45 GHz with two different absorbents, as carbon and silicon carbide, and the results were compared. The temperature distribution inside the sample was determined by solving the conservation equations coupled with the microwave and chemical kinetic equations. Lambert’s law was applied to describe the electromagnetic field in the microwave cavity. The effective heat capacity method was used to account for the latent heat in the melting range of plastic. The heat of the reaction was taken into account using first-order kinetic equations assuming a single-step reaction. One-dimensional model equations were solved using the finite difference method utilising MATLAB codes. The model developed in this study provides a better understanding of the fundamental mechanisms of the microwave pyrolysis of HDPE based on a combination of electromagnetic field and thermal models. The primary focus was to incorporate and investigate the effect of the phase changes and reaction during microwave pyrolysis. The results show that the temperature profile strongly depends on the physical properties of the material. Silicon carbide provides more uniform heating distribution compared with carbon.

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Trninić, Marta. "Mathematical modelling of primary and secondary pyrolysis: State of the art". FME Transactions 48, nr 4 (2020): 733–44. http://dx.doi.org/10.5937/fme2004733t.

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Pyrolysis process converts biomass into liquid, gaseous and solid fuels. Chemical kinetics play a key role in explaining the characteristics of pyrolysis reactions and developing mathematical models. Many studies have been undertaken to understand the kinetics of biomass pyrolysis; however, due to the heterogeneity of biomass and the complexity of the chemical and physical changes that occur during pyrolysis, it is difficult to develop a simple kinetic model that is applicable in every case. In this review, different methods to describe biomass primary and secondary pyrolysis with different types of kinetic mechanisms are discussed.

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Assoumani, Nidhoim, Merlin Simo-Tagne, Fatima Kifani-Sahban, Ablain Tagne Tagne, Maryam El Marouani, Marcel Brice Obounou Akong, Yann Rogaume, Pierre Girods i André Zoulalian. "Numerical Study of Cylindrical Tropical Woods Pyrolysis Using Python Tool". Sustainability 13, nr 24 (15.12.2021): 13892. http://dx.doi.org/10.3390/su132413892.

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In this paper, the thermal behavior of large pieces of wood pyrolysis has been modeled. Two mathematical models coupling heat transfer equations to chemical kinetics were used to predict the pyrolytic degradation of a 25 mm radius wood sample, assumed to be dry in the first model and wet in the second, when heated to 973.15 K. The reactions involved in the pyrolysis process are assumed to be endothermic. The diffusion of bounded water during the process is taken into account in the second model, where the heat transfer equation has been coupled to that of the diffusion of moisture. This model, although simple, provides more information on the drying and pyrolysis processes during the heating of wood, which is its originality. It can therefore be advantageously used to calculate the temperature distribution in a pyrolysis bed. The equations of the two models, discretized by an explicit finite difference method, were solved numerically by a program written in Python. The validation of both models against experimental work in the literature is satisfactory. The two models allow examination of the temperature profile in the radial direction of wood samples and highlighting of the effect of temperature on some thermal, physical and physicochemical characteristics.

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Нурисламова, Л. Ф., i И. М. Губайдуллин. "Numerical analysis of parameter identifiability for a mathematical model of a chemical reaction". Numerical Methods and Programming (Vychislitel'nye Metody i Programmirovanie), nr 3 (25.07.2018): 282–92. http://dx.doi.org/10.26089/nummet.v19r327.

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Авторами статьи ведутся работы, направленные на разработку численного подхода к анализу параметрической идентифицируемости модели химической реакции методами анализа чувствительности для эффективного исследования и управления процессом химической реакции. Целью настоящей работы является определение параметров, подлежащих идентификации в условиях задаваемой погрешности измерений, химической реакции на примере процесса пиролиза пропана и определение незначимых параметров модели. Выполнена редукция 157-стадийной детальной схемы пиролиза пропана к 30-стадийной схеме. Предложена кинетическая модель для анализа низкотемпературного пиролиза пропана. Модель адекватно описывает выход наблюдаемых продуктов реакции при атмосферном давлении. Идентифицированы параметры кинетической модели пиролиза пропана путем решения обратной задачи химической кинетики. The authors of this paper develop a numerical approach to analyze the parametric identifiability of chemical reaction models by the methods of sensitivity analysis for the efficient study and management of chemical reaction processes. The primary objective of this paper is to determine the parameters to be identified for the propylene pyrolysis process and to determine the insignificant parameters of the model. The 157-step detailed pyrolysis scheme of propane is reduced to the 30-step scheme. A kinetic model is proposed to analyze the low-temperature pyrolysis of propane. This model adequately describes the yield of observed reaction products at atmospheric pressure. The parameters of the kinetic model of propane pyrolysis are identified by solving the inverse problem of chemical kinetics.

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Alvarado Flores, José Juan, Jorge Víctor Alcaraz Vera, María Liliana Ávalos Rodríguez, Luis Bernardo López Sosa, José Guadalupe Rutiaga Quiñones, Luís Fernando Pintor Ibarra, Francisco Márquez Montesino i Roberto Aguado Zarraga. "Analysis of Pyrolysis Kinetic Parameters Based on Various Mathematical Models for More than Twenty Different Biomasses: A Review". Energies 15, nr 18 (7.09.2022): 6524. http://dx.doi.org/10.3390/en15186524.

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Today, energy use is an important and urgent issue for economic development worldwide. It is expected that raw material in the form of biomass and lignocellulosic residues will become increasingly significant sources of sustainable energy in the future because they contain components such as cellulose, hemicellulose, lignin, and extractables with high energy-producing potential. It is then essential to determine the behavior of these materials during thermal degradation processes, such as pyrolysis (total or partial absence of air/oxygen). Pyrolyzed biomass and its residual fractions can be processed to produce important chemical products, such as hydrogen gas (H2). Thermogravimetric (TGA) analysis and its derivative, DTG, are analytical techniques used to determine weight loss as a function of temperature or time and associate changes with certain degradation and mass conversion processes in order to evaluate kinetic properties. Applying kinetic methods (mathematical models) to degradation processes permits obtaining several useful parameters for predicting the behavior of biomass during pyrolysis. Current differential (Friedman) and integral (Flynn–Wall–Ozawa, Kissinger–Akahira–Sunose, Starink, Popescu) models vary in their range of heating speeds (β) and degree of advance (α), but some (e.g., Kissinger’s) do not consider the behavior of α. This article analyzes the results of numerous kinetic studies using pyrolysis and based on thermogravimetric processes involving over 20 distinct biomasses. The main goal of those studies was to generate products with high added value, such as bio-char, methane, hydrogen, and biodiesel. This broad review identifies models and determines the potential of lignocellulosic materials for generating bioenergy cleanly and sustainably.

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Ismailov, Bakhtiyar, Zhanat Umarova, Khairulla Ismailov, Aibarsha Dosmakanbetova i Saule Meldebekova. "Mathematical modeling and algorithm for calculation of thermocatalytic process of producing nanomaterial". Indonesian Journal of Electrical Engineering and Computer Science 23, nr 3 (1.09.2021): 1590. http://dx.doi.org/10.11591/ijeecs.v23.i3.pp1590-1601.

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<p>At present, when constructing a mathematical description of the pyrolysis reactor, partial differential equations for the components of the gas phase and the catalyst phase are used. In the well-known works on modeling pyrolysis, the obtained models are applicable only for a narrow range of changes in the process parameters, the geometric dimensions are considered constant. The article poses the task of creating a complex mathematical model with additional terms, taking into account nonlinear effects, where the geometric dimensions of the apparatus and operating characteristics vary over a wide range. An analytical method has been developed for the implementation of a mathematical model of catalytic pyrolysis of methane for the production of nanomaterials in a continuous mode. The differential equation for gaseous components with initial and boundary conditions of the third type is reduced to a dimensionless form with a small value of the peclet criterion with a form factor. It is shown that the laplace transform method is mainly suitable for this case, which is applicable both for differential equations for solid-phase components and calculation in a periodic mode. The adequacy of the model results with the known experimental data is checked.</p>

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Makoba, Mmoloki, Daniel Erich Botha, Mpho Thabang Rapoo, László Zsolt Szabó, Thapelo Shomana, Paul Serban Agachi i Edison Muzenda. "A Review on Botswana Coal Potential from a Pyrolysis and Gasification Perspective". Periodica Polytechnica Chemical Engineering 65, nr 1 (6.07.2020): 80–96. http://dx.doi.org/10.3311/ppch.12909.

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Coal pyrolysis and gasification are promising options for the future of Botswana as the country has large coal reserves with severe limitations in terms of export options. Coal characterization facilities will be required in order to harness its full potential and methods such as proximate, ultimate and chemical structure analysis (FTIR, Raman spectroscopy and X-ray diffraction techniques) were investigated. The paper presents a brief history of pyrolysis and gasification, typical types of the reactors as well as factors that influence product selection for Botswana coal. Coal pyrolysis and gasification are complex processes and it is difficult to define the mechanisms of product formation. However, there are several kinetic models that are relevant to the sub-bituminous coal of Botswana which were proposed by researchers to describe the formation of the compounds and mathematical models that were validated by other researchers on mass and heat transfer as also presented herein.

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Szubel, M., A. Dernbecher i T. Dziok. "Determination of kinetic parameters of pyrolysis of wheat straw using thermogravimetry and mathematical models". IOP Conference Series: Earth and Environmental Science 214 (23.01.2019): 012131. http://dx.doi.org/10.1088/1755-1315/214/1/012131.

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Донской, Игорь Геннадьевич. "Mathematical modelling of woody particles pyrolysis in a fixed bed". Вычислительные технологии, nr 6(23) (16.01.2019): 14–24. http://dx.doi.org/10.25743/ict.2018.23.6.003.

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Рассмотрена задача термического разложения совокупности последовательно расположенных древесных частиц с учетом внешнего тепломассообмена с газовым потоком и внутренних физико-химических процессов (теплопроводность, диффузия, фильтрация, сушка и химическая реакция). Математическая модель строится из субмоделей одиночных частиц, сопряженных по потокам теплоты и массы. Результаты численных расчетов позволяют исследовать динамическое поведение частиц в условиях плотного слоя, что представляет интерес при проектировании малых энергетических установок на биотопливе. The development of new energy technologies requires the improvement of mathematical models to describe the physical and chemical processes taking place in power plants. The process of wood particles fixed-bed pyrolysis is investigated in this paper: this process takes place both in the traditional combustion of wood fuels in fixed-bed boilers and in energotechnology processes aimed at producing combustible gases and chemical products (tar, charcoal). The problem of pyrolysis of a set of successively located wood particles is considered. Each particle is considered as an object with an internal distribution of temperature, pressure and concentrations. A system of equations is constructed for a single particle, including external heat and mass transfer between the particles and the ambient gas flow combined with internal physicochemical processes (heat conduction, diffusion, filtration, drying and chemical brutto-reaction of the organic mass decomposition producing gases and solid residue). The temperature of the gas in the pores of the particles is equal to the temperature of the solid. Using the model of pyrolysis of a single particle, it is possible to reproduce the known experimental data. The mathematical model of a fixed-bed pyrolysis is based on submodels of single particles, conjugated over heat and mass flows. The interaction between the particles composing the layer is reduced to heat fluxes: radiant heat transfer between the surfaces of adjacent particles occurs in the bed, as well as convective heat transfer between the heated gas and particles. The result is that each next particle layer is heated at a smaller temperature difference. On the one hand, the intensity of heat transfer decreases, on the other hand, the efficiency of using heat increases. The results of numerical calculations make it possible to study the dynamic behavior of particles in a fixed bed, which is of interest in the design of small power plants using biofuels.

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Rozprawy doktorskie na temat "Pyrolysis Mathematical models"

Donskoi, Eugene. "The mathematical modelling of direct reduction in iron ore/coal composites including the modelling of coal pyrolysis". Thesis, Queensland University of Technology, 2000.

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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.

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Urbina, Nelson D. "A Multivariate Model for Identification of Bacteria using Pyrolysis-GC/MS". Thesis, Uppsala University, Department of Mathematics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-122468.

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Mirjana, Ćeranić. "Uticaj procesnih parametara na pirolizu i gasifikaciju oklaska kukuruza". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95537&source=NDLTD&language=en.

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U doktorskoj disertaciji vršeno je ispitivanje procesa pirolize i gasifikacijeoklaska kukuruza. Istraživanje procesa pirolize obuhvatalo je definisanjeuticaja procesnih parametara (temperature pirolize, reakcionog vremena,brzine zagrevanja i veliĉine ĉestica) na prinos ĉvrstog ostatka i pirolitiĉkoggasa. Osim toga, vršeno je ispitivanje sastava gasa u zavisnosti odtemperature. UtvrĊeno je da ispitivani procesni parametri imaju uticaj naprinos ĉvrstog ostatka i bio-ulja, kao i na prinos i sastav pirolitiĉkog gasa.Tokom ispitivanja procesa gasifikacije razvijen je funkcionalni matematiĉkimodel gasifikacije oklaska kukuruza u struji vazduha koji bi trebalo daomogući optimizaciju procesa gasifikacije goriva u cilju dobijanja gasovitogproizvoda.
Doctoral dissertation investigates pyrolysis and gasification of corncob.Investigation of pyrolysis process included defining the influence of processparameters (pyrolysis temperature, reaction time, heating rate and particlesize) on pyrolysis gas and char yield. Also, temperature dependence ofpyrolysis gas composition was investigated. It was confirmed that processparameters influence char and bio-oil yield and pyrolysis gas yield andcomposition. A functional mathematical model of air-stream gasification ofcorncob was developed in order to enable optimization of gasificationprocess with the objective of obtaining gaseous product.

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Milan, Milotić. "Uticaj procesnih parametara na pirolizu i gasifikaciju otpadnih automobilskih pneumatika". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=93324&source=NDLTD&language=en.

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U disertaciji je prikazan matematički modelgasifikacije otpadnih automobilskih pneumatika.Modelom je istražen uticaj količine ubačenog vazduhai vodene pare u gasifikator i temperatura gasifikacijena prinos gasovitih produkata. Numerička proceduraje riješena Newton-Raphson metodom a brojnevrijednosti molskih udjela gasovitih komponenata uravnotežnoj mješavini dobijene su korišćenjemprogramskog jezika C.U drugom dijelu disertacije prikazano jeeksperimentalno ispitivanje pirolize otpadnihautomobilskih pneumatika. Eksperimentalni rezultatiukazuju da na prinos gasa, odnosno na prinos čvrstog(koksnog) ostatka značajno utiču parametri: veličinačestice otpadne gume, temperatura pirolize i brzinazagrijavanja uzorka.
The dissertation presents a mathematical model ofgasification of waste automotive tires. The modelexamined the impact of the amount of the loaded air andwater vapor in the gasifier and gasification temperatureto yield gaseous products. The numerical procedure isresolved Newton-Raphson method and the numericalvalues of mole portions of gaseous components in theequilibrium mixture obtained using the programminglanguage C.In the second part of the thesis is shownexperimentally testing pyrolysis of waste automotivetires. Experimental results indicate that the yield of gas,or to yield a solid (coke) significantly affect the rest of theparameters: the size of the particles of waste rubberpyrolysis temperature and heating rate of the sample.

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Rompho, Nopadol. "Preliminary study of modeling of NO formation during black liquor combustion". Thesis, 1997. http://hdl.handle.net/1957/34401.

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The importance of two sources of NO formation, nitrogen in combustion air and nitrogen in the fuel, during black liquor combustion was studied using a laminar entrained flow reactor. Pyrolysis and combustion experiments were conducted in nitrogen atmosphere and in a mixture of argon and helium in the composition 99% argon, 1% helium. The experiments were performed at three different temperatures: 700, 900, and 1100��C and at two residence times: 0.6 and 1.6 seconds. The results indicated that there was NO formation from the combustion air which was found to be prompt NO. There was NO formation from combustion air at all temperatures, and it decreased as temperature increased. Depending on conditions, prompt NO formation accounted for 6-80% of the total NO formation. NO reduction experiments were conducted to investigate the effect of molten sodium carbonate on NO reduction. The experiments were performed at two different temperatures, 800��C which is lower than the melting point of sodium carbonate and 900��C which is higher than the melting point of sodium carbonate. The rate constant for NO reduction was calculated and was found to agree well with that obtained in a previous study. The effect of the molten sodium carbonate on NO reduction was found to be negligible during black liquor pyrolysis. The rate in absence of any reducing gas components could explain NO reduction during black liquor combustion only to a limited extent. Models for nitrogen evolution during pyrolysis and combustion were developed by using data from previous studies. A model for nitrogen release during pyrolysis was developed as a function of residence time and temperature. Nitrogen release during pyrolysis was also found to be directly proportional to carbon release and the rate of nitrogen evolution with respect to the rate of carbon evolution decreased as temperature increased.
Graduation date: 1997

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Wildegger-Gaissmaier, Anna Elisabeth. "Fluidized bed utilization of South Australian coals / Anna Elisabeth Wildegger-Gaissmaier". Thesis, 1988. http://hdl.handle.net/2440/18806.

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Książki na temat "Pyrolysis Mathematical models"

Rompho, Nopadol. Preliminary study of modeling of NO formation during black liquor combustion. 1997.

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Części książek na temat "Pyrolysis Mathematical models"

Butt, A. R., M. G. Jepson i J. Moodie. "Communicating Chemical Processes — A Transputer Model of the British Coal Twin-Bed Pyrolyser/Combustor". W European Consortium for Mathematics in Industry, 95–98. Wiesbaden: Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-09834-8_14.

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Oladokun, Olagoke, Bemgba Bevan Nyakuma i Arshad Ahmad. "Fundamental Theories and Kinetic Models for the Pyrolysis of Lignocellulosic Biomass Wastes". W Handbook of Research on Resource Management for Pollution and Waste Treatment, 123–51. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0369-0.ch007.

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Biomass agricultural waste has a great potential for meeting part of the world energy need and is completely environmentally friendly. One conversion method is thermochemical processes and specifically, pyrolysis. Pyrolysis converts the lignocellulose waste to fuel and essential chemicals into three products: biogas, bio-oil, and biochar. However, performance issues limit the potential of lignocellulose pyrolysis such as design and operation of pyrolysis reactor for effective heat transfer from the heat source to the biomass feedstock. Therefore, this study presents the necessary tools for pyrolysis scientists and engineers in determining the optimal operation and design of lignocellulose agricultural waste pyrolysis. The tools consist of mathematical equations that govern the lignocellulose kinetics (model and model-free) and pyrolysis reactor macro and micro models. A practical model for hydrogen production from pyrolysis bio oil solidifies the viability of biomass as an energy source.

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Rueda-Ordóñez, Yesid Javier, Érico de Godois Baroni, Lizeth Katerine Tinoco-Navarro i Katia Tannous. "Modeling the Kinetics of Lignocellulosic Biomass Pyrolysis". W Innovative Solutions in Fluid-Particle Systems and Renewable Energy Management, 92–130. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8711-0.ch004.

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The study of the kinetics involved in lignocellulosic biomass pyrolysis has received great attention in the last decades and different mathematical models have been derived. In this chapter, a literature review was performed in order to summarize the existing models that use thermogravimetric data to estimate the kinetic parameters, which are important to improve and optimize the process. Additionally, a case study was presented exemplifying the application of kinetic modeling for the residue of one Brazilian species (Brazil nut woody shell). The isoconversional models of Ozawa-Flynn-Wall, modified Coats-Redfern, and Friedman were applied, as well as three and four independent parallel reactions models. The four reactions model presented the best fit between experimental and theoretical data, providing a better representation of the biomass pyrolysis reaction.

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Dhaundiyal, Alok, Suraj B. Singh i Muammel M. Hanon. "Comparative Evaluation of Crisp and Fuzzy Schemes to Solve Chemical Kinetic Models". W Advanced Fuzzy Logic Approaches in Engineering Science, 132–61. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5709-8.ch007.

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This study investigates the application of the crisp and the fuzzy schemes to evaluate the kinetic parameters of thermal decomposition of biomass. A distributed reactivity model is considered for the demonstration of mathematical methods for pyrolysis of biomass. The numerical solution is assessed on the assumption that it follows Laplace's method for asymptotic evaluation of integral. A parabolic regime of temperature is subjected to examination by the thermal analysis. The relevant parameters and variables related to biomass and distribution function are assessed on the basis of crisp and fuzzy perspectives. A distributed reactivity method relies on the modelling of pyrolysis reactions where an overlapping of parallel reactions leads to reactivity distribution, which can be symbolised by any distribution functions. Therefore, the normal distribution pattern is assumed to be involved in the given problem of pyrolysis. The temperature regime is supposed to follow the equation of parabola, T=at^2+c.

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Ranzi, E. "Pyrolysis: Mathematical Modeling of Hydrocarbon Pyrolysis Reactions". W Reference Module in Chemistry, Molecular Sciences and Chemical Engineering. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-12-409547-2.11542-2.

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Perminov, Valeriy Afanasievich. "Mathematical Modeling of Steppe Fires". W Predicting, Monitoring, and Assessing Forest Fire Dangers and Risks, 48–62. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1867-0.ch002.

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The chapter presents a mathematical model of the initiation and spread of the steppe fire. The mathematical model is based on the laws of mechanics of multiphase reacting media. The main physicochemical processes describing the drying, pyrolysis, and combustion of gaseous and condensed pyrolysis products are taken into account. As a result of the numerical solution, the distributions of the velocity, temperature, and concentration fields of the components of the gas and condensed phases were determined. The dependence of the rate of spread of the steppe fire on the main parameters of the state of vegetation cover and wind speed was studied. The mathematical model presented in the chapter can be used to predict the spread of steppe fires for various types of steppe vegetation and meteorological conditions, as well as for preventive measures.

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Migliavacca, Gabriele, Emilio Parodi, Loretta Bonfanti, Tiziano Faravelli, Sauro Pierucci i Eliseo Ranzi. "A general mathematical model of solid fuels pyrolysis". W Sustainable Development of Energy, Water and Environment Systems, 279–88. CRC Press, 2004. http://dx.doi.org/10.1201/b17383-36.

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Streszczenia konferencji na temat "Pyrolysis Mathematical models"

Haseli, Y., J. A. van Oijen i L. P. H. de Goey. "Mathematical Modeling of Heat and Mass Transfer Processes During Pyrolysis and Combustion of a Single Biomass Particle". W ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58096.

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A detailed mathematical model is developed for simulation of heat and mass transfer processes during the pyrolysis and combustion of a single biomass particle. The kinetic scheme of Shafizadeh and Chin is employed to describe the pyrolysis process. The light gases formed during the biomass pyrolysis is assumed to consist of methane, carbon dioxide, carbon monoxide, hydrogen and water vapor with given mass fractions relevant to those found in the experiments of high heating conditions. The combustion model takes into account the reactions of oxygen with methane, hydrogen, carbon monoxide, tar and char as well as gasification of char with water vapor and carbon dioxide. Appropriate correlations taken from past studies are used for computation of the rate of these reactions. The model allows calculation of time and space evolution of various parameters including biomass and char densities, gaseous species and temperature. Different experimental data reported in the literature are employed to validate the pyrolysis and combustion models. The reasonable agreement obtained between the predictions and measured data reveals that the presented model is capable of successfully capturing various experiments of wood particle undergoing a pyrolysis or combustion process. In particular, the role of gas phase reactions within and adjacent to particle on the combustion process is examined. The results indicate that for the case of small particles in the order of millimeter size and less, one may neglect any effects of gas phase reactions. However, for larger particles, a combustion model may need to include hydrogen oxidation and even carbon monoxide combustion reactions.

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Singh, Kaushlendra, Mark Risse, K. C. Das i John Worley. "Determination of Composition of Cellulose and Lignin Mixtures Using Thermo Gravimetric Analysis (TGA)". W 15th Annual North American Waste-to-Energy Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/nawtec15-3222.

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The proportional composition of cellulose, hemicellulose, lignin and minerals in a biomass plays a significant role in the proportion of pyrolysis products (bio-oil, char, and gases). Traditionally, the composition of biomass is chemically determined, which is a time consuming process. This paper presents the results of a preliminary investigation of a method using thermo-gravimetric analysis for predicting the fraction of cellulose and lignin in lignin-cellulose mixtures. The concept is based on a newly developed theory of Pyrolytic Unit Thermographs (PUT). The Pyrolytic Unit Thermograph (PUT) is a thermograph showing rate of change of biomass weight with respect to temperature for a unit weight loss. These PUTs were used as input for two predictive mathematical procedures that minimize noise to predict the fractional composition in unknown lignin-cellulose mixtures. The first model used linear correlations between cellulose/lignin content and peak decomposition rate while the second method used a system of linear equations. Results showed that both models predicted the composition of lignin-cellulose mixture within 7 to 18% of measured value. The promising results of this preliminary study will certainly motivate further refinement of this method through advanced research.

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Kenarsari, Saeed Danaei, i Yuan Zheng. "A Numerical Study of Fast Pyrolysis of Beetle Killed Pine Trees". W ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62991.

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Since 1990s, as a result of unprecedented drought and warm winters, mountain pine beetles have devastated mature pine trees in the forests of western North America from Mexico to Canada. Especially, in the State of Wyoming, there are more than 1 million acres of dead forest now. These beetle killed trees are a source of wildfire and if left unharvested will decay and release carbon back to the atmosphere. Fast pyrolysis is a promising method to transfer the beetle killed pine trees into bio-oils. In the present study, an unsteady state mathematical model is developed to simulate the fast pyrolysis process, which converts solid pine wood pellets into char (solid), bio-oils (liquid) and gaseous products in the absence of oxidizer in a temperature range from 500°C to 1000°C within short residence time. The main goal of the study is to advance the understanding of kinetics and convective and radiative heat transfer in biomass fast pyrolysis process. Conservation equations of total mass, species, momentum, and energy, coupled with the chemical kinetics model, have been developed and solved numerically to simulate fast pyrolysis of various cylindrical beetle killed pine pellets (10 mm diameter and 3 mm thickness) in a reactor (30 mm inside diameter and 50 mm height) exposed to various radiative heating flux (0.2 MW/m2 to 0.8 MW/m2). A fast pyrolysis kinetics model for pine wood that includes competitive path ways for the formation of solid, liquid, and gaseous products plus secondary reactions of primary products has been adapted. Several heat transfer correlations and thermo property models available in the literature have been evaluated and adapted in the simulation. Finite element method is used to solve the conservation equations and a 4th order Runge-Kutta method is used to solve the chemical kinetics. Unsteady-state two dimensional temperature and product distributions throughout the entire pyrolysis process were simulated and the simulated product yields were compared to the experimental data available in the literature. This study demonstrates the importance of the secondary reactions and appropriate convective and radiative modeling in the numerical simulation of biomass fast pyrolysis.

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Nakamura, Masato, Hanwei Zhang, Karsten Millrath i Nickolas J. Themelis. "Modeling of Waste-to-Energy Combustion With Continuous Variation of the Solid Waste Fuel". W ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55342.

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A mathematical model of a mass-burn, waste-to-energy combustion chamber has been developed that includes stochastic representation of the variability of the fuel (municipal solid waste, MSW). The drying, pyrolysis, gasification and combustion processes on the moving grate are governed by several factors such as proximate and ultimate analysis, particle size, moisture, heating value, and bulk density, all of which change continuously. This extreme variability has not been considered in past mathematical models of WTE combustion that used mean values of the MSW properties. The Monte Carlo stochastic method has been applied to provide a time series description of the continuous variation of solid wastes at the feed end of the traveling grate. The combustion of the solid particles on the grate is simulated using percolation theory. The feed variation and the percolation theory models are combined with the FLIC two-dimensional bed model developed by Sheffield University to project the transient phenomena in the bed, such as the break-up of waste particles and the channeling of combustion air throughout the bed, and their effects on the combustion process.

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Fernando, Niranjan, Muhammad Amin, Mahinsasa Narayana, Thamali Jayawickrama, Asadumllah i Sanath Jayasena. "A mathematical model for Pyrolysis of biomass". W 2015 Moratuwa Engineering Research Conference (MERCon). IEEE, 2015. http://dx.doi.org/10.1109/mercon.2015.7112311.

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Tuntsev, Denis V., Rushan R. Safin, Rustam G. Hismatov, Rifkat A. Halitov i Vladimir I. Petrov. "The mathematical model of fast pyrolysis of wood waste". W 2015 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS). IEEE, 2015. http://dx.doi.org/10.1109/meacs.2015.7414929.

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Farana, Radim, i Radek Svoboda. "Operational recommendations for pyrolysis unit cooler based on mathematical model". W 2013 14th International Carpathian Control Conference (ICCC). IEEE, 2013. http://dx.doi.org/10.1109/carpathiancc.2013.6560515.

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Agarwal, Gaurav, Gang Liu i Brian Lattimer. "Pyrolysis and Combustion Energetic Characterization of Coal-Biomass Fuel Blends". W ASME 2013 Power Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/power2013-98313.

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A simultaneous thermogravimetric analyzer (STA) and a microscale combustion calorimeter (MCC) were used to investigate the energetic properties of coal, biomass and mixture samples. The STA was used to measure the gravimetric and energetic response of a pyrolyzing sample under inert atmosphere. A pyrolysis mathematical model was used to calculate the heat of pyrolysis of samples from the STA data. The MCC was used to quantify the dynamic heat output from the combustion of the gases produced during the pyrolysis process. The measurement of heat output as a function of temperature was used to calculate the heat of combustion of fuels. It was found that the co-pyrolysis of coal and biomass fuel mixtures exhibited a weighted additive gravimetric and energetic behavior, both from pyrolysis and combustion aspects. It was further validated and concluded that the weighted sum prediction for the heat of pyrolysis and heat of combustion for the coal-biomass fuel mixtures must be conducted on the basis of their individual volatile mass contributions, and not on the basis of initial fuel mixture proportion.

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Yuen, R., G. de Vahl Davis, E. Leonardi, G. H. Yeoh i V. Chandrasekaran. "A Computational Model for Enclosure Fires Incorporating Pyrolysis of Cellulosic Fuel". W ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0617.

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Abstract Flame spread and fire over cellulosic materials occur when the burning region supplies sufficient heat to the virgin solid to cause gasification. Under proper conditions, the reaction between the generated volatiles and the oxidant (air) may be sustained. The characteristics of the flame spread are therefore the result of heat and mass transfer processes as well as finite-rate gas phase chemical kinetics. We describe here a new three-dimensional mathematical model to study flame spread over cellulosic fuels. Both the pyrolysis and burning of a vertical timber wall of a room and the turbulent flow, combustion and radiation in the room, are included. The predictions of this model have been compared with the results of an experiment. Excellent agreement has been achieved.

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Menseidov, Dz, I. Zheleva i M. Filipova. "Test and training model of a pyrolysis unit with three vertical tigels". W APPLICATION OF MATHEMATICS IN TECHNICAL AND NATURAL SCIENCES: 12th International On-line Conference for Promoting the Application of Mathematics in Technical and Natural Sciences - AMiTaNS’20. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0034771.

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