Thermodynamic possibilities and constraints for pure hydrogen production by iron based chemical looping process at lower temperatures

Svoboda, Karel; Słowiński, Grzegorz; Rogut, Jan; Baxter, David

doi:10.1016/j.enconman.2007.05.019

Cited by 145 publications

(75 citation statements)

References 26 publications

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“…9,[16][17][18][19][20] Recent research on chemical looping gasification processes, however, is mostly limited to conceptual studies. Svodoba et al 21,22 examined, using thermodynamic principles, the feasibility of using Fe, Mn, Ni, Cr, and Co based particles for hydrogen production. They concluded that Fe-Fe 3 O 4 is more suitable for chemical looping gasification compared to other particles; they stated that Fe 3 O 4 is difficult to be reduced using a fluidized bed.…”

Section: Introductionmentioning

confidence: 99%

Syngas chemical looping gasification process: Bench‐scale studies and reactor simulations

et al. 2009

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in Wiley InterScience (www.interscience.wiley.com).The syngas chemical looping process co-produces hydrogen and electricity from syngas through the cyclic reduction and regeneration of an iron oxide based oxygen carrier. In this article, the reducer, which reduces the oxygen carrier with syngas, is investigated through thermodynamic analysis, experiments, and ASPEN Plus V R simulation. The thermodynamic analysis indicates that the countercurrent moving-bed reducer offers better gas and solids conversions when compared to the fluidized-bed reducer. The reducer is continuously operated for 15 h in a bench scale moving-bed reactor. A syngas conversion in excess of 99.5% and an oxygen carrier conversion of nearly 50% are obtained. An ASPEN Plus V R model is developed which simulates the reducer performance. The results of simulation are consistent with those obtained from both the thermodynamic analysis and experiments. Both the experiments and simulation indicate that the proposed SCL reducer concept is feasible. V V C 2009 American Institute of Chemical Engineers AIChE J,

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Section: Introductionmentioning

confidence: 99%

Syngas chemical looping gasification process: Bench‐scale studies and reactor simulations

et al. 2009

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“…Ishida et al(2002) and Jin et al(2002) investigated iron oxides CLC. Piotrowski et al (2007), Piotrowski et al (2005) and Mondal et al (2004) studied the kinetics of hematite to wustite on TGA with CO+ H 2 or CO. From the thermodynamic and chemical equilibrium point of view, Svoboda et al (2007) studied the reduction of Fe 203 by H 2, CO, C~and a model syngas and the oxidation of iron by steam. Since coal is considerably more abundant, it would be highly advantageous if the CLHG process could be adapted for solid fuels.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Coal Fueled Chemical Looping Combustion Using Fe3O4 as Oxygen Carrier

Xlang¹,

Sun²,

Wangt³

et al. 2009

Proceedings of the 20th International Conference on Fluidized Bed Combustion

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Chemical-looping combustion (CLC) is a novel combustion technique with CO 2 separation. Magnetite (Fe304) was selected as the oxygen carrier and Shenhua coal (Inner Mongolia, China) as the fuel for this study. The influences of operation temperatures, and coal to Fe 304 mass ratios on the reduction characteristics of the oxygen carrier were investigated using an atmosphere TGA. The sample, comprised of 2.25mg coal and 12.75mg Fe304, was heated to 1000 "C. Experimental results show that the reaction between the coal volatile and Fe 304 began at 700°C while the reaction between the coal char and Fe 304 occurred at 800°C and reached a peak at 900°C. Fe304 was fully reduced into FeO, while some FeO was further reduced to Fe. As the operation temperature rises, the reduction conversion rate increases. At the temperatures of 850°C, 900°C, and 950°C, the reduction conversion rates were 37.1 %, 46.5%, and 54.1% respectively. When the mass ratios of coal to Fe 304 were 5/95, 10/90, 15/85, and 20/80, the reduction conversion rates were 29.5%,40.8%,46.5%, and 46.6% respectively. With the increase of coal to Fe304 mass ratio, the conversion rate increases first and then changes no more. There exists an optimal coal to Fe 304 mass ratio.

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“…. 48 Figura 2.14-Diagrama do arranjo experimental utilizados por Stehle et al (2011) (Fontana, 1987 Svoboda et al (2007) , Stamatiou (2012) e Nigro (2015 Simões-Moreira et al (2016) …”

Section: Lista De Figurasunclassified

“…Na figura 3.4 é apresentado o equilíbrio termodinâmico entre Ferro, gás hidrogênio e vapor de água (Fe-H 2 -H 2 O) de acordo com a temperatura e o volume de vapor de água na mistura de gases, sendo possível prever a formação da fase de acordo com a composição e temperatura. Svoboda et al (2007)). …”

Section: Análise Termodinâmica E Cinética Químicaunclassified

“…Na primeira coluna desta tabela é apresentado a temperatura e nas colunas subsequentes estão a variação da entalpia de formação (∆h Analisando as tabelas 3.1, 3.2 e 3.3 conclui-se que a oxidação em temperatura menor é mais favorável termodinamicamente, e que com temperaturas menores a concentração de gás hidrogênio (H 2 %) é maio do que em temperaturas elevadas, de acordo com o diagrama de equilíbrio apresentado na figura 3.4 (Svoboda et al, 2007). Na análise da cinética química, utilizam-se os modelos simplificados da reação de oxidação em alta temperatura.…”

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Estudo experimental do processo de oxidação do ferro com vapor de água para a produção de gás hidrogênio.

Goto¹

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AgradecimentosOs agradecimentos principais são direcionados ao Prof. Dr. José Roberto Simões Moreira pela orientação e ao Prof. Dr. Marcelo Breda Mourão pela ajuda e direcionamento deste trabalho. Ao técnico do SISEA Thyago Reynaldo e para os técnicos do PMT Lívio, Danilo, Rafael e Rubens pela ajuda. Aos colegas do laboratório LM 2 C 2 César, LinaMaria, Matheus e o estagiário Gustavo pela ajuda. Aos meus colegas e (Ex)-integrantes do laboratório SISEA Bruno, Eli, Erick, Beethoven, Adrienne, Bernardo e pelo apoio e dedicação. A todos amigos e colegas pelo apoio. Finalmente, agradeço à minha família, pelo apoio e a minha namorada Pamela Jordana pelo companheirismo e paciência. À CAPES pela concessão da bolsa de mestrado para a realização desta pesquisa. ResumoNeste trabalho, foi estudado a oxidação do ferro com vapor d'água em forno elétrico, para a produção de gás hidrogênio. Partindo-se da revisão bibliográfica, escolheu-se o ferro devido suas propriedades e por apresentar um bom rendimento, além disso o ferro é um material barato e abundante. Na estudo experimental foi três experimentos diferentes. No primeiro, o ferro foi oxidado em forno elétrico em temperaturas de 600 a 1000• C, variando a cada 100• C, e tempo fixado em 3 horas. Na segunda série de experimento, foi fixado a temperatura em 800• C e variou a duração do processo de oxidação de 1 a 4 horas, com variação de 1 hora. E na terceira série de experimentos foi realizado a análise termogravimétrica para avaliação da cinética química do processo de oxidação. Os resultados dos experimentos indicaram a produção de gás hidrogênio em quantidades maiores em temperatura de 1000• C. Além disso foi possível observar que a taxa de oxidação do ferro é maior durante a primeira hora de ensaio. A estimativa de hidrogênio produzido é de 0,9549 g/min − m 2 em oxidação a 1000• C. Já nos resultados da termogravimetria foi obtido a energia de ativação de 147 kJ/mol. Palavras-chaves:Hidrogênio, Oxidação de ferro, Ciclos termoquímicos, Combustível solar. AbstractIn this work was studied the oxidation of iron by steam in the electric furnace to produce hydrogen. The first step was the literature review and iron oxide was chose to be oxidized, due to its characteristics and good yield. Furthermore, the iron is a cheap and abundant in the earth. In the experimental studies was conducted three different experiments. The First one, the iron was oxidized in the electric furnace in the temperature range of 600 -1000• C with a variation of 100 • C and the oxidation time was fixed in 3 hours. The second experiment was conducted with fixed temperature of 800• C and varied the oxidation time, the range of time was from 1 to 4 hours with a variation of 1 hour. The third experiment was the thermogravimetric analysis to study the chemical kinetics, with three different temperature, 600, 800 and 1000• C. The result of studies showed that a high temperature the hydrogen production increased and decreased with low temperature. Furthermore, the high oxidation rate was observed in the first h...

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Thermodynamic possibilities and constraints for pure hydrogen production by iron based chemical looping process at lower temperatures

Cited by 145 publications

References 26 publications

Syngas chemical looping gasification process: Bench‐scale studies and reactor simulations

Syngas chemical looping gasification process: Bench‐scale studies and reactor simulations

Investigation of Coal Fueled Chemical Looping Combustion Using Fe3O4 as Oxygen Carrier

Estudo experimental do processo de oxidação do ferro com vapor de água para a produção de gás hidrogênio.

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