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Dissertations / Theses on the topic 'Gasification reactor'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Earp, David M. "Gasification of biomass in a downdraft reactor." Thesis, Aston University, 1988. http://publications.aston.ac.uk/10218/.

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The objective of this study was to design, construct, commission and operate a laboratory scale gasifier system that could be used to investigate the parameters that influence the gasification process. The gasifier is of the open-core variety and is fabricated from 7.5 cm bore quartz glass tubing. Gas cleaning is by a centrifugal contacting scrubber, with the product gas being flared. The system employs an on-line dedicated gas analysis system, monitoring the levels of H2, CO, CO2 and CH4 in the product gas. The gas composition data, as well as the gas flowrate, temperatures throughout the sys

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2

Mansaray, Kelleh Gbawuru. "Gasification of rice husk in a fluidized bed reactor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0022/NQ31530.pdf.

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3

Z'Graggen, Andreas. "Solar gasification of carbonaceous materials : reactor design, modeling and experimentation /." kostenfrei, 2008. http://e-collection.ethbib.ethz.ch/view/eth:30596.

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4

Hägglund, Philip. "Commissioning of Entrained Flow Reactor for Combustion and Gasification Research." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66204.

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5

Rasol, 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.

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To release energy from chemically stored energy in the biomass was the new investigation in recent years. Utilizing of biomass for this purpose occur in two different ways, directly by burning (combustion) the biomass and indirectly by pyrolysis process which will convert the biomass to three main products, bio- tar, bio- char and synthetic gas. Biomass contains different amount of inorganic compound, especially alkali metals which causes some diverse impacts on combustion, pyrolysis and gasification process such as corrosion, agglomeration and fouling problems. This project aims to investigat

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6

McKinnon, Hamish Alexander. "Improved Hydrogen Production from Biomass Gasification in a Dual Fluidissed Bed Reactor." Thesis, University of Canterbury. Chemical and Process Engineering, 2009. http://hdl.handle.net/10092/4459.

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Biomass gasification is a technology under development that presents a means of generating hydrogen using renewable energy. While many forms of gasification have been investigated, steam gasification using a dual fluidised bed (DFB) reactor has been shown to efficiently produce high hydrogen content producer gas. The aims of this research were to increase the hydrogen yield from the 100kW DFB gasifier installed at the University of Canterbury, and thereby improve the current state of the art of gasifier operation. Calcium carbonate-based minerals such as calcite and dolomite were shown to be

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7

Al-Hwayzee, Mohammed. "Design and development of gasification processes in fluidised bed chemical reactor engineering." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/97762/.

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This thesis focuses on studying and investigation the effects of the hydrodynamic and operating parameters in the air-biomass gasification in a bubbling fluidised bed gasifier under low temperature (< 800°C) conditions and evaluating the potential of the gasification of two solid biomass waste materials, Iraqi date palm wastes and sawdust pinewood. These parameters are air flowrate, particle size of the sand bed material, biomass particle size, static bed height, air equivalence ratio, bed temperature, number of holes in distributor plates and biomass fuel type. A design study was conducted to

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8

Hassan, Mohamed. "Modelling and simulation of biomass gasification in a circulating fluidized bed reactor." Thesis, Aston University, 2013. http://publications.aston.ac.uk/20858/.

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Computational Fluid Dynamics (CFD) has found great acceptance among the engineering community as a tool for research and design of processes that are practically difficult or expensive to study experimentally. One of these processes is the biomass gasification in a Circulating Fluidized Bed (CFB). Biomass gasification is the thermo-chemical conversion of biomass at a high temperature and a controlled oxygen amount into fuel gas, also sometime referred to as syngas. Circulating fluidized bed is a type of reactor in which it is possible to maintain a stable and continuous circulation of solids i

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9

PHOUNGLAMCHEIK, Aekjuthon. "Modellering av pyrolys i roterande trumma." Thesis, KTH, Skolan för kemivetenskap (CHE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173840.

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This project focuses on the numerical modeling of a rotary kiln pyrolyzer such as found in the e.g. WoodRoll multistage gasification process. The model consists of two parts: a granular flow model, and a pyrolyzer model. In the first part, Saeman's equation was employed to develop a model which can describe the behavior of solid granular flow in a rotary kiln without reaction. Residence-time distribution (RTD) is the main aim to study in this part, which was simulated by axial dispersion model (ADM). The model requires only one fitting parameter that is dispersion coefficient (Dax), which was

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10

Hlebak, Joshua J. "Equilibrium Modeling, Design, Construction, and Validation Testing of a Pilot Scale, USS Gasification Reactor." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1314293669.

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11

Guyemat, Mbourou Sarah Marielle. "Plastic waste gasification using a small scale IR reactor : experimental and modelling analysis." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2480.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2016.<br>The generation of municipal solid waste has increased significantly due to the exponential population growth and it has become a global issue. Gasification technology, an alternative method for waste treatment is a thermochemical process where carbon-based material are exposed to an environment deprived in oxygen, was used for this project. The aim of this thesis is to study the gasification of plastic waste which is a potential alternative energy source using infrared heaters. To achieve this goal, fun

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12

Messenbock, Reinhard Christoph. "Rapid pyrolysis and gasification of coal in a high-pressure wire-mesh reactor." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/7740.

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13

Patel, Nikhil. "Studies On The Combustion And Gasification Of Concentrated Distillery Effluent." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/274.

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The need for effective disposal of huge volumes of industrial waste is becoming more challenging due to expected imposition of stringent pollution control regulations in the near future. Thermochemical conversion, particularly gasification of organics in the waste is considered the best route from the perspective of volume reduction and prevalent eco-friendly concept of waste-to-energy transformation. It is considered imperative to have adequate understanding of basic combustion features as a part of the thermochemical conversion process, leading to gasification. The aim of this thesis is to u

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14

Young, Christopher Michael. "Pressure Effects on Black Liquor Gasification." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11539.

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Gasification of black liquor is an alternative to the combustion of black liquor, which is currently the dominant form of chemical recovery in the paper industry. Gasification of black liquor offers the possibility of higher thermal efficiencies than combustion, reducing manufacturing costs and creating new revenue streams through a forest biorefinery. Pressurizing the gasification reactor further enhances the efficiency advantage of gasification over combustion. This study uses a pressurized entrained flow reactor (PEFR) to study black liquor gasification behavior under pressures, tempera

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15

Zhang, Qinglin. "Mathematical modeling of municipal solid waste plasma gasification in a fixed-bed melting reactor." Doctoral thesis, KTH, Energi- och ugnsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-47451.

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The increasing yield of municipal solid waste (MSW) is one of the main by-products of modern society. Among various MSW treatment methods, plasma gasification in a fixed-bed melting reactor (PGM) is a new technology, which may provide an efficient and environmental friendly solution for problems related to MSW disposals. General objectives of this work are to develop mathematical models for the PGM process, and using these models to analyze the characteristics of this new technology. In this thesis, both experimental measurement and numerical analysis are carried out to evaluate the performanc

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16

Septien, Stringel Joël. "High temperature gasification of millimetric wood particles between 800°C and 1400°C." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0125/document.

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La gazéification de la biomasse a été étudiée dans les conditions d'un réacteur à flux entraîné, à savoir à vitesse de chauffage et à température élevées. Des expériences ont été réalisées dans un four à chute entre 800°C et 1400°C, à partir de particules de bois de taille 0,35 mm et 0,80 mm, dans une atmosphère inerte (100% molaire de N2), ou contenant de la vapeur d’eau (25% molaire). Les expériences ont également été simulées grâce à un modèle 1D avec des résultats positifs, ce qui a permis de mieux comprendre les phénomènes mis en jeu. Les solides obtenus (suies et char) ont été analysés e

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17

Peter, E. Akhator. "Design and Construction of a Small-Scale Fixed-Bed Reactor." Thesis, Högskolan i Borås, Institutionen Ingenjörshögskolan, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17971.

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As biomass and municipal solid wastes become increasingly viable fossil fuels alternatives, more researches are being conducted to improve on the processes for their conversion to energy or energy carriers. Gasification is one of such processes and it forms the core of this project. This project presents a specified design of a small-scale fixed-bed reactor for the purpose of investigating the gasification processes of biomass and municipal solid wastes. Gas extraction ports are evenly distributed along the height of the reactor to extract product gases and accommodate thermo-couples for tempe

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18

Strandberg, Martin. "From torrefaction to gasification : Pilot scale studies for upgrading of biomass." Doctoral thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-103046.

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Increasing the share of biomass, preferably by replacing fossil fuels, is one way to mitigate the present climate change. Fossil coal can be directly replaced by co-combustion of coal and biomass and fossil engine fuels (gasoline and diesel) could potentially partly be replaced by synthetic renewable fuels produced via entrained flow gasification of biomass. The use of biomass in these processes is so far limited, partly because of the fibrous and hygroscopic nature of biomass which leads to problem in storing, transportation, handling and feeding. This thesis demonstrates how the challenging

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19

Vypušťáková, Veronika. "Atmosferické zplyňování biomasy s přídavkem kyslíku a vodní páry." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400509.

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The topic of master´s thesis is atmosferic gasification of biomass by the addition of oxygen and steam. The theoretical part is devoted to the description of biomass, process of gasification, kinds of gasification reactor and product gas. Further experiments are devised depending on the gasification medium and output temperature. In this case, the key aspect is the steam addition control. In the practical part, these experiments are performed in a fluidized bed reactor. Resulting values from samples of gas and tar are subsequently processed and evaluated.

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20

Hejazi, Bijan. "Modeling of biomass steam gasification in a dual fluidized bed reactor with/without lime-based CO₂ capture." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60663.

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Lime-enhanced biomass gasification in a dual fluidized bed (DFB) reactor is a promising technology that allows enhanced hydrogen production from a renewable resource with simultaneous CO₂ capture via calcium looping. In this thesis, modeling Ca-looping in a DFB biomass gasifier is broken down into different steps. Firstly, a comprehensive single particle model is developed, based on conservation of mass, energy and momentum, with two different biomass pyrolysis kinetic schemes for particles of changing thermo-physical properties. Secondly, a coupled particle and reactor model of biomass dryin

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21

Marklund, Magnus. "Pressurized entrained-flow high temperature black liquor gasification : CFD based reactor scale-up method and spray burner characterization /." Luleå : Division of Fluid Mechanics, Luleå University of Technology, 2006. http://epubl.ltu.se/1402-1544/2006/42LTU-DT-0642-SE.pdf.

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22

Aloqaili, Mashal Mohammed. "THE EFFECT OF JATROPHA TORRIFIED BIOMASS AND COAL PREPARATION ON STEAM CO-GASIFICATION IN A FIXED BED REACTOR." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1570.

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Coal fired power stations produce vast amounts of harmful products that may affect our health and environment. Co-gasification of coal and biomass could be a solution to this issue as an emerging technology. Biomass may reduce emissions significantly and it may contribute to reducing capital operational cost while providing high gas yields. This research tests the co-gasification of coal and biomass blended chars. Coal and biomass were both prepared. Coal Illinois No #6 was prepared as coal semi-char and coal-char while Jatropha biomass was torrefied at six different temperatures ranging from

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23

Chuayboon, Srirat. "Solar fuels production from thermochemical gasification and reforming of carbonaceous feedstocks." Thesis, Perpignan, 2019. http://www.theses.fr/2019PERP0019.

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Les procédés thermochimiques solaires étudiés concernent la conversion de charges hydrocarbonées solides ou gazeuses en syngas, ainsi que la réduction d’oxydes en métaux en utilisant l’énergie solaire concentrée pour effectuer les réactions endothermiques, permettant ainsi le stockage de l’énergie solaire intermittente en carburants sans émissions de CO2. Ce travail a pour objectif l’étude expérimentale de trois procédés solaires incluant la gazéification de biomasse, le reformage de méthane en boucle chimique, et la carboréduction de ZnO et MgO. La gazéification et le reformage permettent la

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24

Ribas, Vinicius Eduardo. "Estudo da utilização de concentradores solares para o processo de gaseificação de biomassa - concepção de um reator químico solar." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-25082016-095328/.

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Há décadas a energia solar atrai pesquisadores de todo o planeta devido ao seu enorme potencial de aplicações como fonte de energia térmica. Com a crescente preocupação com o Meio Ambiente e a busca por fontes renováveis de energia, o interesse pelo aproveitamento da energia proveniente do Sol cresceu ainda mais. Apesar de desafios como a intermitência e a sazonalidade solares, e a dificuldade de transporte desta forma de energia, a busca por técnicas de armazenamento visa mitigar estes problemas. Uma alternativa termoquímica é a produção de combustíveis solares, ou seja, combustíveis obtidos

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25

Rocha, Melissa Rodrigues de la. "Simulação de um reator de combustão e gaseificação através de uma rede de reatores equivalentes baseada em fluidodinâmica computacional." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/149181.

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No presente trabalho são empregadas ferramentas de fluidodinâmica computacional (CFD) como base à criação de uma rede de reatores equivalente para o estudo de um reator de leito fluidizado borbulhante em escala piloto pertencente à CIENTEC-RS, empregado para a gaseificação de carvão das minas de Candiota-RS. Inicialmente, foram conduzidas simulações fluidodinâmicas em meio reacional gasoso (utilizando metano e ar) para análise do comportamento do escoamento no gaseificador. A partir de medições do equipamento real e dados de projeto do mesmo foi implementada no software CFX 13.0 a geometria do

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26

Botha, Frederick Johannes. "Simulation of a syngas from coal production plant coupled to a high temperature nuclear reactor." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71785.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: In light of the rapid depletion of the world’s oil reserves, concerns about energy security prompted the exploration of alternative sources of liquid fuels for transportation. One such alternative is the production of synthetic fuels with the indirect coal liquefaction process or Coal-To-Liquids (CTL) process. In this process, coal is burned in a gasifier in the presence of steam and oxygen to produce a synthesis gas or syngas, consisting mainly of hydrogen and carbon monoxide. The syngas is then converted to liquid fue

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Chiuta, Steven. "The potential utilization of nuclear hydrogen for synthetic fuels production at a coal–to–liquid facility / Steven Chiuta." Thesis, North-West University, 2010. http://hdl.handle.net/10394/4840.

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The production of synthetic fuels (synfuels) in coal–to–liquids (CTL) facilities has contributed to global warming due to the huge CO2 emissions of the process. This corresponds to inefficient carbon conversion, a problem growing in importance particularly given the limited lifespan of coal reserves. These simultaneous challenges of environmental sustainability and energy security associated with CTL facilities have been defined in earlier studies. To reduce the environmental impact and improve the carbon conversion of existing CTL facilities, this paper proposes the concept of a nuclear–assis

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28

Teixeira, Priscila Lane Lemos. "GaseificaÃÃo do Glicerol a Vapor em Leito Fixo e Meio Poroso NÃo CatalÃtico e CÃlculo do BalanÃo EnergÃtico." Universidade Federal do CearÃ, 2012. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=8937.

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FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico<br>Como o processo de gaseificaÃÃo do glicerol adquire um balanÃo energÃtico desfavorÃvel, Ã sugerida a operaÃÃo de um gaseificador como dispositivo de heat recovery. Nesse contexto, um reator de leito fixo Ã operado com gases de exaustÃo a uma temperatura de 820ÂC como fonte de energia e injeÃÃo eletrÃnica contÃnua de glicerol e Ãgua. O reator de leito fixo foi construÃdo com aÃo inox AISI 310 e com capacidade volumÃtrica de 3,73 litros e como material poroso do leito a alumina com 1,5 mm de diÃmetro. O experimento utilizo

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Pellegrino, Roberto. "Gaseificação de carvão mineral com adição de vapor e remoção de H2S, em leito fluidizado." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264140.

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Orientador: Caio Glauco Sanchez<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-07T01:30:03Z (GMT). No. of bitstreams: 1 Pellegrino_Roberto_M.pdf: 5673705 bytes, checksum: ab5152461f33f423ca032ca41d02c786 (MD5) Previous issue date: 2006<br>Resumo: O presente trabalho aborda a influência da adição de vapor d¿água no rendimento do gás combustível e na remoção de H2S do carvão mineral misturado com dolomita e gaseificado em reator de leito fluidizado. Para isso foi necessária a construção de um gaseificador d

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Vissotto, João Paulo 1982. "Cogaseificação de serragem de pinus e lodo de esgoto em leito fluidizado." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264144.

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Orientador: Caio Glauco Sánchez<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-23T18:32:48Z (GMT). No. of bitstreams: 1 Vissotto_JoaoPaulo_M.pdf: 17443827 bytes, checksum: 1532a467facbbea36dcaa47864ef9b7d (MD5) Previous issue date: 2013<br>Resumo: Este trabalho aborda o estudo da cogaseificação de dois tipos de resíduos de biomassas (serragem de pinus e lodo de esgoto sanitário esgoto sanitário e industrial da cidade de Americana - SP) com o objetivo de comprovar experimentalmente os efeitos sinérgicos de

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Rodrigues, Rodolfo. "Modelagem cinética e de equilíbrio combinadas para simulação de processos de gaseificação." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/140478.

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A gaseificação é um processo de conversão termoquímica que compreende a oxidação parcial de um combustível para convertê-lo em uma mistura gasosa (“syngas”). Geralmente a modelagem desses processos utiliza uma descrição cinética detalhada ou os aproximam ao equilíbrio químico. Ambas as abordagens têm vantagens e desvantagens, bem como limitações. O objetivo deste trabalho foi o desenvolvimento de uma nova modelagem fenomenológica de processos de gaseificação através de um modelo “híbrido” aqui chamado de modelo híbrido adaptativo por zonas (HAZ). Este modelo assumiu que o gaseificador é repres

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Dubinová, Petra. "Zplyňování biomasy v kyslíkové atmosféře." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400508.

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Biomass gasification using air with addition of oxygen can be the right way to increase the quality of the syngas produced. This thesis aims to characterize the gasification process using oxygen-enriched air and verify its effect on the gas. The theoretical part deals with description of the technology with an emphasis on various gasifying agents and different possibilities of increasing gas quality. The practical part contains the results of measurements on the atmospheric fluidized bed reactor and their evaluation. The experiment was performed with various oxygen enrichment taking into accou

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Ross, David. "Devolatilisation and volatile matter combustion during fluidised-bed gasification of low-rank coal." Title page, contents and summary only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phr823.pdf.

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Bibliography: leaves 234-252. The devolution times of seven coals were determined by measuring the centre temperature response for single particles held stationary in a bench scale atmospheric fluidised-bed reactor.

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Billaud, Joseph. "Gazéification de la biomasse en réacteur à flux entrainé : études expérimentales et modélisation." Thesis, Ecole nationale des Mines d'Albi-Carmaux, 2015. http://www.theses.fr/2015EMAC0010/document.

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Ce travail porte sur l'étude de la gazéification de biomasse en Réacteur à Flux Entrainé (RFE), dans le contexte du développement de procédés pour la production de biocarburants de deuxième génération. L'objectif de cette thèse est de modéliser les différents phénomènes qui régissent la conversion de la biomasse dans des conditions représentatives d'un RFE. La pyrolyse et la gazéification de particules de hêtre de taille comprise entre 315 et 415 µm ont été étudiées entre 800 et 1400°C en four à chute de laboratoire. L'influence de l'ajout de H2O, de CO2 et de O2 sur les produits de gazéificat

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Mortazavi, Hamid Reza. "Rubbling and structural stability of underground coal gasification reactors /." Thesis, Connect to this title online; UW restricted, 1989. http://hdl.handle.net/1773/7051.

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Soncini, Ryan Michael. "Computational Simulation of Coal Gasification in Fluidized Bed Reactors." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/78733.

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The gasification of carbonaceous fuel materials offers significant potential for the production of both energy and chemical products. Advancement of gasification technologies may be expedited through the use of computational fluid dynamics, as virtual reactor design offers a low cost method for system prototyping. To that end, a series of numerical studies were conducted to identify a computational modeling strategy for the simulation of coal gasification in fluidized bed reactors. The efforts set forth by this work first involved the development of a validatable hydrodynamic modeling strategy

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Meillot, Erick. "Contribution a l'etude d'un plasma d'arc de vapeur d'eau : application a la gazeification de charbon pulverise en plasma d'arc." Toulouse 3, 1988. http://www.theses.fr/1988TOU30030.

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On presente le developpement d'un prototype preindustriel d'une torche a plasma d'arc de vapeur d'eau. Calcul des proprietes thermodynamiques (composition chimique, enthalpie massique, chaleur specifique) du systeme ar/h::(2)o, a pression constante, entre 700 et 15000 k. On presente les evolutions des coefficients de transport du systeme ar/h::(2)o en fonction de la temperature. La thermolyse de l'eau est abordee a l'aide d'un modele numerique. Dimensionnement d'un reacteur plasma pour la synthese de gaz produit sont calcules pour differents types de charbon. Modele numerique de simulation de

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Fukutome, Asuka. "VAPOR-PHASE REACTION AND ITS ROLE IN CELLULOSE GASIFICATION." Kyoto University, 2017. http://hdl.handle.net/2433/218023.

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Adhikari, Shreya. "EXPERIMENTAL AND KINETIC ANALYSIS OF CATALYTIC GASIFICATION." Cleveland State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=csu1406058470.

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Perkins, Gregory Martin Parry Materials Science &amp Engineering Faculty of Science UNSW. "Mathematical modelling of underground coal gasification." Awarded by:University of New South Wales. Materials Science and Engineering, 2005. http://handle.unsw.edu.au/1959.4/25518.

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Mathematical models were developed to understand cavity growth mechanisms, heat and mass transfer in combination with chemical reaction, and the factors which affect gas production from an underground coal gasifier. A model for coal gasification in a one-dimensional spatial domain was developed and validated through comparison with experimental measurements of the pyrolysis of large coal particles and cylindrical coal blocks. The effects of changes in operating conditions and coal properties on cavity growth were quantified. It was found that the operating conditions which have the greatest im

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Latif, 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/.

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The present study is in two parts, the first part describes an investigation that was undertaken to determine the feasibility and hydrodynamic behaviour of a cold model circulating fluidized bed system proposed for the continuous combustion-gasification of biomass. The design is based on the principle that the char produced in the gasifier is circulated with the bed material and combusted in a separate reactor to generate the heat required for the gasification process. While high solid circulation rates are required to maintain the heat balance, product and flue gas mixing between the two unit

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Hodge, Elizabeth Marjorie Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "The coal char-CO2 reaction at high temperature and pressure." Publisher:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/43634.

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Integrated gasification combined cycle is an advanced electricity generation technology, based on coal gasification. Wider deployment requires further research into the components of the process, including coal gasification. The coal gasification reactions are the slowest step in the gasifier and therefore determine size and operating conditions. Understanding the rate of the gasification reactions at high temperatures is crucial for accurate design and optimisation of the gasification process. While the rates have been measured at low temperature, limited data exist at the high temperatures a

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Baumlin, Sébastien. "Craquage thermique des vapeurs de pyrolyse-gazéification de la biomasse en réacteur parfaitement auto-agité par jets gazeux." Thesis, Vandoeuvre-les-Nancy, INPL, 2006. http://www.theses.fr/2006INPL041N/document.

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ALes gaz issus des procédés de pyrolyse-gazéification de la biomasse doivent être épurés. Ils contiennent des vapeurs condensables (goudrons), des aérosols, des particules solides fines, des composés soufrés et des métaux alcalins qu’il s’agit d’éliminer avant leur utilisation sur des turbines (production d’électricité) ou comme gaz de synthèse. Les expériences rapportées dans ce travail concernent les vapeurs condensables et leur conversion par craquage thermique. Les vapeurs sont produites par pyrolyse de la biomasse dans un premier réacteur (RP) à 540°C. Elles sont ensuite craquées dans un

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Tremel, Alexander [Verfasser]. "Reaction Kinetics of Solid Fuels during Entrained Flow Gasification / Alexander Tremel." München : Verlag Dr. Hut, 2013. http://d-nb.info/1031843787/34.

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Dai, Peng. "Modelling non-catalytic gas-solid reactions." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271240.

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The overall objective of the work described in this Dissertation was to develop and verify a general reaction and diffusion model for non-catalytic reactions between gases and porous solids, particularly those relevant to the clean use of fossil fuels. Here, the internal pore structure of the solid was characterised by observing the kinetics in a regime limited only by intrinsic chemical reaction. It was hypothesised that a simple arbitrary function, f(X), determined from experimental measurements of rate vs. conversion in a kinetically-controlled regime, could be used in place of formal, math

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SAMS, DAVID ALAN. "THE KINETICS AND MECHANISM OF THE POTASSIUM-CATALYZED CARBON/CARBON DIOXIDE GASIFICATION REACTION." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188012.

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The catalytic effect of potassium on the rate of CO₂ gasification of a bituminous coal char and a pure carbon substrate is investigated. The gasification rate depends on both the catalyst concentration (K/C atomic ratio) and the internal porous structure of the solid. For low values of the K/C atomic ratio, the initial gasification rate (mg carbon gasified per initial gram carbon per min) increases sharply with the addition of catalyst; at higher values, the rate profile levels off. The sharp increase in rate is due to the activation of reaction sites while the plateau is attributed to the sat

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Chlubna, Martin. "Zplyňování biomasy se směsí kyslíku a vodní páry." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417847.

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The aim of this diploma thesis is to describe the gasification of biomass with a mixture of oxygen and water vapor. The theoretical part is focused on the gasification process, gasification reactors and the quality of the resulting gas. In the experimental part we look for the ideal ratio of oxygen to water vapor, which are used as gasification media. Subsequent measurements are carried out on the fluidized bed reactor, the results of which are further processed and evaluated.

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Lang, Mason J. "CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE." Cleveland State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342.

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Duncan, Kirsteen. "Pseudo-spectral and path-following techniques with applications to problems in biology and the gasification of coal." Thesis, Heriot-Watt University, 1988. http://hdl.handle.net/10399/962.

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DeYoung, Stefan [Verfasser]. "Numerical Simulation of Entrained Flow Gasification with Focus on Char Reaction Kinetics / Stefan DeYoung." München : Verlag Dr. Hut, 2019. http://d-nb.info/1188516086/34.

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