Tesis sobre el tema "Gasifiers"
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Duchesne, Marc A. "Slagging in Entrained-flow Gasifiers". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23353.
Texto completoLatif, Ajmal. "A study of the design of fluidized bed reactors for biomass gasification". Thesis, University College London (University of London), 1999. http://discovery.ucl.ac.uk/1349342/.
Texto completoMonaghan, Rory F. D. (Rory Francis Desmond). "Dynamic reduced order modeling of entrained flow gasifiers". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58191.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references.
Gasification-based energy systems coupled with carbon dioxide capture and storage technologies have the potential to reduce greenhouse gas emissions from continued use of abundant and secure fossil fuels. Dynamic reduced order models (ROMs) that predict the operation of entrained flow gasifiers (EFGs) within IGCC (integrated gasification combined cycle) or polygeneration plants are essential for understanding the fundamental processes of importance. Such knowledge can be used to improve gasifier reliability, availability and maintainability, leading to greater commercialization of gasification technology. A dynamic ROM, implemented in Aspen Custom Modeler, has been developed for a range of EFGs. The ROM incorporates multiple feedstocks, mixing and recirculation, particle properties, drying and devolatilization, chemical kinetics, fluid dynamics, heat transfer, pollutant formation, slag behavior and syngas cooling. The ROM employs a reactor network model (RNM) that approximates complex fluid mixing and recirculation using a series of idealized chemical reactors. The ROM was successfully validated for steady-state simulation of four experimental gasifiers. The throughputs of these gasifiers range from 0.1 to 1000 metric tonnes per day (3 kWth - 240 MWth). Sensitivity analysis was performed to identify the parameters most important to ROM accuracy. The most important parameters are found to be those that determine RNM geometry, particle physical and kinetic properties, and slagging. The ROM was used to simulate the steady-state and dynamic performance of a full-scale EFG system. In steady-state mode, the ROM was used to establish base case and fluxant requirements. The base case performance agreed with design specifications. Steady-state simulation was also used to determine important states for dynamic simulation. Six cases were examined in dynamic mode, including gasifier cold start. Dynamic results showed agreement with industrial experience for gasifier start-up times.
by Rory F. D. Monaghan.
Ph.D.
Double, J. M. "The design, evaluation and costing of biomass gasifiers". Thesis, Aston University, 1988. http://publications.aston.ac.uk/9702/.
Texto completoAlonso, Lozano Alvaro. "Coal gasification in entrained flow gasifiers simulation & comparison". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-12726.
Texto completoMirmoshtaghi, Guilnaz. "Biomass gasification in fluidized bed gasifiers : Modeling and simulation". Doctoral thesis, Mälardalens högskola, Framtidens energi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-33426.
Texto completoPuig, Arnavat Maria. "Performance modelling and validation of biomass gasifiers for trigeneration plants". Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/51880.
Texto completoThis thesis develops a simple but rigorous model for simulation, design and preliminary evaluation of trigeneration plants based on biomass gasification. It includes a review and study of various models proposed for the biomass gasification process and different plant configurations. A modified thermodynamic equilibrium model is developed for application to real processes that do not reach equilibrium. In addition, two artificial neural network models, based on experimental published data, are also developed: one for BFB gasifiers and one for CFB gasifiers. Both models offer the opportunity to evaluate the influence of variations of biomass and operating conditions on the quality of gas produced. The different models are integrated into the global model of a small-medium scale biomass gasification trigeneration plant proposing three different configurations for the generation of electricity, heat and cold. These configurations are applied to a case study of the ST-2 polygeneration plant foreseen inCerdanyola del Valles.
Gustafsson, Eva. "Characterization of particulate matter from atmospheric fluidized bed biomass gasifiers". Doctoral thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-11473.
Texto completoSilaen, Armin. "Comprehensive Modeling and Numerical Investigation of Entrained-Flow Coal Gasifiers". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1148.
Texto completoPallay, Krista Joy. "Surface Modifications to Mitigate Refractory Degradation in High-Temperature Black Liquor Gasifiers". Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10488.
Texto completoKieffer, Benoit. "Potential market for small-scale gasifiers in rural areas of developing countries". Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145649.
Texto completoSouza-Santos, Marcio Luiz de. "Modelling and simulation of fluidized-bed boilers and gasifiers for carbonaceous solids". Thesis, University of Sheffield, 1987. http://etheses.whiterose.ac.uk/1857/.
Texto completoXu, Qixiang. "Investigation of Co-Gasification Characteristics of Biomass and Coal in Fluidized Bed Gasifiers". Thesis, University of Canterbury. Chemical and Process, 2013. http://hdl.handle.net/10092/8399.
Texto completoGöransson, Kristina. "Internal Tar/CH4 Reforming in Biomass Dual Fluidised Bed Gasifiers towards Fuel Synthesis". Doctoral thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-22984.
Texto completoGasification-based Biorefinery for Mechanical Pulp Mills
Kuhn, John N. "Investigation of catalytic phenomena for solid oxide fuel cells and tar removal in biomass gasifiers". Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1186755244.
Texto completoBrooks, Amelia (Amelia Samek). "Modeling of char oxidation in fluidized bed biomass gasifiers : effects of transport and chemical kinetics". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98959.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (page 36).
Technologies for the conversion of biomass to liquid fuels are important to develop because the demand for liquid fuels remains unchanged even with the necessity of limiting dependence on fossil fuels. Fluidized Bed Biomass Gasification (FBBG) is one such technology that can perform the initial step of converting raw biomass into syngas as an intermediate to liquid fuels. The char that is left in the reactor after devolatilization can be oxidized in order to maximize the amount of biomass carbon that is converted to gaseous carbon and generate heat to drive endothermic gasification reactions. This paper examines the rate of each of the three processes that occur during char conversion (external diffusion, chemical reactions, and intraparticle diffusion) to determine which process limits the rate of the reaction under a range of conditions. It was determined that at most FBBG operating points, the rate of char conversion will be limited by the rate of diffusion of oxygen through the particle's boundary layer and through its pores. Only at low reactor temperatures and small particle diameters will the reaction rate be purely kinetically limited. An overall rate expression accounting for all three processes has been formulated which can be implemented in more detailed reactor models.
by Amelia Brooks.
S.B.
Kuhn, John. "Investigation of catalytic phenomena for solid oxide fuel cells and tar removal in biomass gasifiers". The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1186755244.
Texto completoGonzalez, Anselmo Dueñas 1968. "Caracterização e análise comparativa de cinzas provenientes da queima de biomassa". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265872.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: O presente trabalho apresenta o desenvolvimento de um processo de caraterização das cinzas das biomassas bagaço de cana-de-açúcar, eucalipto e capim elefante após sua queima quando utilizadas para geração de energia alternativa. É, então, analisada a influência de parâmetros físico-químicos na qualidade final das cinzas. O parâmetro químico avaliado foi a interpretação da composição elementar das cinzas estudadas por análises de Espectrometria de Fluorescência de Raios-X e Cromatografia de Íons e por Análise Química por, objetivando a caracterização e reutilização desses resíduos. As amostras de cinzas de biomassas estudadas neste trabalho, foram analisadas quanto à presença dos elementos Cloro (Cl-), Alumínio (em Al2O3), Cálcio (em CaO), Ferro (em Fe2O3), Fósforo (em P2O5), Magnésio (em MgO), Manganês (em MnO), Potássio (em K20), Sódio (em Na2O) e Silício (em SiO2), e foram caracterizadas conforme os percentuais em massa dos elementos presentes. Os resultados obtidos mostraram a possibilidade de reutilização adequada de cinzas das biomassas em função da alteração das propriedades químicas do solo, por ocorrência de elevação dos níveis de pH, Cálcio (Ca), Fósforo (P), redução dos teores de Alumínio (Al) trocável e melhoria substancial da capacidade de agregação das partículas e fertilização do solo. Também foram associadas as influências dos elementos presentes nas cinzas como alternativa viável na composição do cimento Portland, em especial, o Silício (em SiO2). As cinzas das biomassas possuem nutrientes que estão na forma solúvel e são libertados ao longo do tempo devido à sua decomposição contínua e também pela solubilidade dos compostos químicos, o que, consequentemente, torna os nutrientes menos suscetíveis à lixiviação
Abstract: This paper presents the development of a process of characterization of the ashes of biomass bagasse from sugar cane, eucalyptus and elephant grass after its burning when used for alternative energy generation. It then analyzed the influence of physicochemical parameters on the final quality of the ash. The chemical parameter evaluated was the interpretation of the elemental composition of the ash studied by analysis Fluorescence Spectrometry X-Ray and Ion Chromatography and Chemical Analysis, aiming at characterization and reuse of the waste. The ashes from biomass samples studied in this work were analyzed for the presence of chlorine (Cl-), aluminum (as Al2O3), calcium (as CaO), iron (as Fe2O3), phosphorus (as P2O5), Magnesium elements (as MgO), manganese (as MnO), Potassium (as K20) Sodium (as Na2O) and silicon (as SiO2), and were characterized as the weight percentage of the elements present. The results showed the possibility of proper reuse of ashes of biomass due to changes in chemical properties of the soil, by the occurrence of elevated levels of pH, calcium (Ca), phosphorus (P), reduced levels of aluminum (l) the significant improvement exchangeable capacity of aggregation of particles and soil fertilization. Were also associated with the influences of the elements present in the ash as a viable alternative in the composition of the Portland cement, in particular, silicon (as SiO2). The ash of the biomass have nutrients that are in soluble form and are released over time due to its continuous decomposition and also by the solubility of the chemical compounds, which consequently makes them less susceptible to leaching nutrients
Mestrado
Termica e Fluidos
Mestre em Engenharia Mecânica
Stoesser, Philipp [Verfasser]. "Investigation of solid-phase processes during the conversion of biogenic slurry in entrained-flow gasifiers / Philipp Stoesser". München : Verlag Dr. Hut, 2020. http://d-nb.info/1219475548/34.
Texto completoRutherford, John Peter. "Heat and Power Applications of Advanced Biomass Gasifiers in New Zealand's Wood Industry A Chemical Equilibrium Model and Economic Feasibility Assessment". Thesis, University of Canterbury. Chemical and Process Engineering, 2006. http://hdl.handle.net/10092/1142.
Texto completoVan, Dyk Johannes Chrisstoffel. "Manipulation of gasification coal feed in order to increase the ash fusion temperature of the coal to operate the gasifiers at higher temperatures / Johannes Chrisstoffel van Dyk". Thesis, North-West University, 2006. http://hdl.handle.net/10394/1331.
Texto completoThesis (M. Ing. (Chemical Engineering))--North-West University, Potchefstroom Campus, 2006
Visagie, Johannes Petrus. "Generic gasifier modelling : evaluating model by gasifier type". Diss., University of Pretoria, 2008. http://hdl.handle.net/2263/26000.
Texto completoDissertation (MEng)--University of Pretoria, 2008.
Chemical Engineering
unrestricted
Visagie, J. P. "Generic gasifier modelling evaluating model by gasifier type /". Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-07022009-133535.
Texto completoArdila, Yurany Camacho 1985. "Gaseificação da biomassa para a produção de gás de síntese e posterior fermentação para bioetanol : modelagem e simulação do processo". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266052.
Texto completoTese (doutorado) ¿ Universidade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: A produção de biocombustíveis a partir da biomassa apresenta-se como uma alternativa para suprir as limitadas reservas de petróleo. A biomassa, atualmente, está sendo usada para diferentes processos termoquímicos, entre os quais a gaseificação é o de maior destaque. A gaseificação produz gás de síntese que é uma mistura, principalmente, de CO, H2 e CO2. Este gás serve para produzir energia, diferentes produtos químicos e biocombustíveis, como por exemplo, o bioetanol. A partir do gás de síntese, a produção de bioetanol pode ser realizada usando catalisadores químicos ou biocatalisadores, sendo este último processo conhecido como fermentação do gás de síntese. Para o processo integrado de gaseificação da biomassa e posterior fermentação para produção de bioetanol, as informações na literatura são escassas, o que dificulta avaliar a viabilidade desta nova tecnologia, em termos de condições operacionais. O uso de modelos matemáticos e sua simulação computacional podem auxiliar neste estudo. A literatura dispõe de vários estudos envolvendo simulações computacionais aplicadas à gaseificação de diferentes biomassas. Porém, poucos abordam a caracterização real do processo e as propriedades da biomassa utilizada, considerando apenas as propriedades para o carvão mineral, o que acaba gerando divergência nos resultados. Além disso, a maioria fundamenta suas simulações em modelos simples com base na caracterização elementar-imediata, que acaba limitando o desenvolvimento de plantas virtuais, que são baseadas na análise composicional da biomassa quando focadas na produção de bioetanol como etapa final ou como integração do processo. Assim, este trabalho tem como objetivos estudar o processo completo de gaseificação e realizar um estudo preliminar da fermentação do gás de síntese, mediante simulações computacionais, para definir as melhores condições e variáveis que afetam o processo global quando o bagaço de cana-de-açúcar é utilizado como matéria-prima. As simulações foram desenvolvidas utilizando o simulador comercial Aspen Plus¿ e os resultados validados com dados experimentais da literatura e dados obtidos nos Laboratórios LDPS/LOPCA/BIOEN/FEQ/UNICAMP. Para a completa simulação do processo, várias etapas foram estudadas e divididas para melhor entendimento. Foram desenvolvidos modelos matemáticos para predizer propriedades necessárias para o desenvolvimento de processos termoquímicos. Simulações baseadas nas análises elementar-imediata e composicional da biomassa foram realizadas para definir a decomposição inicial da biomassa, demonstrando os diferentes rendimentos e produtos que são gerados e que são a base da etapa inicial da gaseificação. Simulações completas da gaseificação foram desenvolvidas para estudar a gaseificação em diferentes tipos de reatores. A influência das condições de operação na gaseificação como temperatura, razão de equivalência (ER), injeção de vapor e temperatura do pré-aquecedor do ar no desempenho do gaseificador foram avaliadas. Com as condições operacionais da gaseificação definidas foi proposta uma simulação para representar a fermentação do gás de síntese. A partir dos resultados obtidos foi constatado que a composição do gás de síntese é alterada pelo aumento do ER e pela injeção de vapor no processo, e diferentes concentrações de bioetanol são obtidas quando a pressão de entrada do gás de síntese é alterada
Abstract: The production of biofuels from biomass is presented as an alternative to save the limited oil reserves. Currently, biomass is being used for different thermochemical processes, including gasification which is the most prominent. Gasification produces synthesis gas which is a mixture mainly of CO, H2 and CO2. This gas is used to produce energy, several chemicals and biofuels, such as ethanol. The ethanol from synthesis gas may be produced using chemical catalysts or biocatalysts, this latter process is known as fermentation of syngas. The information in the literature is scarce for the integrated gasification of biomass and subsequent fermentation to produce ethanol, making it difficult to see the feasibility of this new technology, in terms of operating conditions. The use of mathematical models and their computer simulation can help this study. Typically, numerous studies involving computer simulations, applied to different biomass gasification, are found in the literature. However, few of them approach the real characterization of process and properties for used biomass, considering only the properties for coal, which ends up generating divergence in the results. Moreover, most of the simulations are grounded on simple models based on proximate-ultimate characteristics, which end up limiting the development of virtual plants, which are based on biomass compositional analysis when focused on the production of ethanol as the final step or as integration process. Thus, the aims of this work are to study the complete gasification process and to carry out a preliminary study of synthesis gas fermentation, through computer simulations, in order to define the best conditions and variables that affect this global process when sugarcane bagasse is used as raw material. The simulations were developed using Aspen Plus ¿ simulator and the results validated with experimental data from literature and data obtained in the laboratories LDPS / LOPCA / BIOEN / FEQ / UNICAMP. For the full simulation of the process, several steps were studied and divided for a better understanding. Mathematical models were developed to predict properties required for the development of thermochemical processes. Simulations based on biomass analysis as proximate-ultimate and compositional were done to define the initial decomposition of biomass, demonstrating the different yields and products that are generated and which are the basis of the initial stage of the gasification. Complete simulations of gasification were carried out to study different types of gasification reactors. The influence of operating conditions at gasification performance was investigated; variables such as temperature, equivalence ratio (ER), steam injection and preheater temperature were evaluated. With the set conditions of gasification was proposed a simulation to represent the fermentation of syngas. It was demonstrated that the synthesis gas composition is changed when increased the ER and steam injection; and different ethanol concentrations are obtained when the input pressure of the synthesis gas is changed
Doutorado
Desenvolvimento de Processos Químicos
Doutora em Engenharia Quimica
James, Rivas Arthur Mc Carty. "The effect of biomass, operating conditions, and gasifier design on the performance of an updraft biomass gasifier". Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/13794.
Texto completoDepartment of Biological and Agricultural Engineering
Wenqiao Yuan
Gasification is an efficient way to produce energy from biomass, which has significant positive impacts on the environment, domestic economy, national energy security, and the society in general. In this study, a lab-scale updraft biomass gasifier was designed, built, and instrumented for stable gasification using low-bulk density biomass. Related accessories, such as a biomass feeder, inlet air temperature controller, air injection nozzle, and tar cracking system, were also developed to enhance gasifier performance. The effect of operation parameters on gasifier performance was studied. Two operational parameters, including air flow rate and feed-air temperature, were studied on three sources of biomass: prairie hay, sorghum biomass, and wood chips. Results showed that higher air flow rate increased tar contents in syngas for all three types. It was also found that different biomasses gave significantly different tar contents, in the order of wood chips>sorghum biomass>prairie hay. Feed-air temperature did not have a significant effect on tar content in syngas except for prairie hay, where higher feed air temperature reduced tar. A statistical model was implemented to study differences on syngas composition. Results showed that different biomasses produced syngas with different high heating value, e.g., wood chips > prairie hay > sorghum biomass. CO composition also showed differences by feed air temperature and biomass, e.g. prairie hay>wood chips>sorghum biomass, but H[subscript]2 did not show significant differences by either biomass type or operating conditions. Moreover, because of the downstream problems caused by tars in syngas such as tar condensation in pipelines, blockage and machinery collapse, an in-situ tar cracking system was developed to remove tars in syngas. The tar cracking device was built in the middle of the gasifier’s combustion using gasification heat to drive the reactions. The in-situ system was found to be very effective in tar removal and syngas enhancement. The highest tar removal of 95% was achieved at 0.3s residence time and 10% nickel loading. This condition also gave the highest syngas HHV increment of 36% (7.33 MJ/m[superscript]3). The effect of gas residence time and Ni loading on tar removal and syngas composition was also studied. Gas residence of 0.2-0.3s and Ni loading of 10% were found appropriate in this study.
Fraser, Thomas. "Numerical modelling of an inverted cyclone gasifier". Thesis, Cardiff University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407403.
Texto completoSalman, Hassan. "Biomass feeding system for a cyclone gasifier". Licentiate thesis, Luleå tekniska universitet, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25666.
Texto completoGentile, Maria. "Alkali attack of coal gasifier refractory lining". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45668.
Texto completoAn experimental test system was designed to simulate the operating conditions found in nonslagging coal gasifiers. The reaction products that form when refractory linings in coal gasifiers are exposed to alkali impurities (sodium or potassium) were experimentally determined. Analysis of selected physical and chemical properties of the reaction products, which typically form between the alkali and the refractory will lead to a better understanding of the mechanisms behind refractory failures associated with alkali attack.
The reaction products sodium aluminate (Na₂O⋅Al₂O₃), N₂C₃A₅ (2Na₂O·3CaO·5A1₂O₃), nepheline (Na20â ¢Al203â ¢2SiO2), potassium aluminate, (K2Oâ ¢Al203), and kaliophilite (K2Oâ ¢Al203â ¢2Si02) were synthesized and their solubility in water and coefficients of linear thermal expansion were: measured. Of the compounds tested, the formation of potassium aluminate would be the most detrimental to the gasifier lining. The linear thermal expansion of potassium aluminate was 2.05% from room temperature to 800°C, which was twice as large as the other compounds. Potassium aluminate also possessed the highest solubility in water which was 8.893/L at 90°C.
Master of Science
Sun, Tawei. "Alkali attack of coal gasifier refractory linings". Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94471.
Texto completoM.S.
Lee, Kyoung-Ho. "Alkali attack on coal gasifier refractory lining". Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80163.
Texto completoMaster of Science
Hoi, W. H. "Gasification of rubberwood in a downdraft gasifier". Thesis, Aston University, 1991. http://publications.aston.ac.uk/9798/.
Texto completoKandamby, Naminda Harisinghe. "Mathematical modelling of gasifier fuelled gas turbine combustors". Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267305.
Texto completoAlauddin, Zainal Alimuddin Zainal. "Performance and characteristics of a biomass gasifier system". Thesis, Cardiff University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399202.
Texto completoRathbone, R. R. "Gasification and combustion in fluidised bed". Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233249.
Texto completoLu, You. "Computational Scheme Guided Design of a Hybrid Mild Gasifier". ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1526.
Texto completoKasedde, Hillary. "Hazard and Safety Evaluation of Gasifier Installations in Uganda". Thesis, KTH, Energiteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-194335.
Texto completoKusar, Henrik. "Catalytic combustion of gasified waste". Doctoral thesis, KTH, Chemical Engineering and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3600.
Texto completoThis thesis concerns catalytic combustion for gas turbineapplication using a low heating-value (LHV) gas, derived fromgasified waste. The main research in catalytic combustionfocuses on methane as fuel, but an increasing interest isdirected towards catalytic combustion of LHV fuels. This thesisshows that it is possible to catalytically combust a LHV gasand to oxidize fuel-bound nitrogen (NH3) directly into N2without forming NOX. The first part of the thesis gives abackground to the system. It defines waste, shortly describesgasification and more thoroughly catalytic combustion.
The second part of the present thesis, paper I, concerns thedevelopment and testing of potential catalysts for catalyticcombustion of LHV gases. The objective of this work was toinvestigate the possibility to use a stable metal oxide insteadof noble metals as ignition catalyst and at the same timereduce the formation of NOX. In paper II pilot-scale tests werecarried out to prove the potential of catalytic combustionusing real gasified waste and to compare with the resultsobtained in laboratory scale using a synthetic gas simulatinggasified waste. In paper III, selective catalytic oxidation fordecreasing the NOX formation from fuel-bound nitrogen wasexamined using two different approaches: fuel-lean andfuel-rich conditions.
Finally, the last part of the thesis deals with deactivationof catalysts. The various deactivation processes which mayaffect high-temperature catalytic combustion are reviewed inpaper IV. In paper V the poisoning effect of low amounts ofsulfur was studied; various metal oxides as well as supportedpalladium and platinum catalysts were used as catalysts forcombustion of a synthetic gas.
In conclusion, with the results obtained in this thesis itwould be possible to compose a working catalytic system for gasturbine application using a LHV gas.
Keywords:Catalytic combustion; Gasified waste; LHVfuel; RDF; Biomass; Selective catalytic oxidation; NH3; NOX;Palladium; Platinum; Hexaaluminate; Garnet; Spinel;Deactivation; Sulfur; Poisoning
Kithinji, Jacob P. "Extraction and chromatography of supercritical fluids". Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329092.
Texto completoAl-Farraji, Abbas. "Chemical engineering and reactor design of a fluidised bed gasifier". Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/104985/.
Texto completoNsamba, Hussein Kisiki. "Performance evaluation and modelling of a small-scale biomass gasifier". Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/50699/.
Texto completoFang, Liane Jessica y Caroline M. Hane-Weijman. "Characteristics of pine needle combustion in a semi-gasifier burner". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68836.
Texto completo"June 2011." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 29).
The motivation behind this report was to develop a stronger understanding of pine needle combustion behavior in a semi-gasifier, in order to ultimately design an effective pine needle cook stove for people in the developing world. Pine needles are a cheap, energy-dense fuel source that can be harnessed for cooking purposes, but they are often physically or chemically altered prior to being used as a fuel. The challenge remains to develop a stove that uses unprocessed pine needles. Using principles of a semi-gasification biomass stove, this paper explores the combustion and burn characteristics of unprocessed pine needles by measuring the effects of temperature in a configured burner when altering primary and secondary airflow into the burner. Experiments showed that pine needles in a semi-gasifier combust in two regimes--one characterized by secondary combustion of volatiles released from the primary burn of raw pine needles, and another characterized by the smoldering of pine needle charcoal. Each regime needed unique balances between primary air and secondary airflow. The first regime required a relatively low primary airflow with a high secondary airflow, while the second regime needed a high primary airflow to maintain charring and low or no secondary airflow. The balance of airflow in the first regime was crucial in determining whether the volatiles combusted or were released as plumes of smoke. The findings of this report can be used as an initial benchmark and resource in the further development of an existing proof-of-concept prototype, which was built by the authors with a team of MIT students and affiliates and a community partner in Uttarakhand, India.
by Liane Jessica Fang and Caroline M. Hane-Weijman.
S.B.
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Texto completoSilaen, Armin. "Simulation of Coal Gasification Process Inside a Two-Stage Gasifier". ScholarWorks@UNO, 2004. http://scholarworks.uno.edu/td/198.
Texto completoEvans, G. D. "Development and operation of an open-core downdraft gasifier system". Thesis, Aston University, 1992. http://publications.aston.ac.uk/9784/.
Texto completoHu, Ming. "Instrumentation and tar measurement systems for a downdraft biomass gasifier". Thesis, Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1678.
Texto completoGunarathne, Duleeka. "Optimization of the performance ofdown-draft biomass gasifier installedat National Engineering Research &Development (NERD) Centre ofSri Lanka". Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-78994.
Texto completoBrown, Jock William. "Biomass Gasification: Fast Internal Circulating Fluidised Bed Gasifier Characterisation and Comparison". Thesis, University of Canterbury. Chemical and Process Engineering, 2006. http://hdl.handle.net/10092/1187.
Texto completoGopalakrishnan, Prasanth. "Modelling of Biomass Steam Gasification in a Bubbling Fluidized Bed Gasifier". Thesis, University of Canterbury. Chemical and Process Engineering, 2013. http://hdl.handle.net/10092/8675.
Texto completoRanwell, Pierre. "A numerical model of the moving bed gasifier / by Pierre Ranwell". Thesis, North-West University, 1997. http://hdl.handle.net/10394/3660.
Texto completoThesis (Ph.D. (Mechanical Engineering))--North-West University, Potchefstroom Campus, 1998.
Rabell, Ferran Santiago. "Modeling and exergoeconomic analysis of biomass gasification in a downdraft gasifier". Thesis, KTH, Skolan för kemivetenskap (CHE), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146595.
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