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- W2499256134 abstract "Two chemical-looping gasification systems, the Syngas Redox (SGR) process and the Chemical Looping Reforming (CLR) process, were developed for the production of hydrogen from coal. Both processes are based on the cyclic reduction and oxidation reaction of iron oxide composite particles. In the SGR process, coal reacts first with a mixture of steam and oxygen to produce syngas. The syngas is then oxidized in a fixed-bed reactor to carbon dioxide and water vapor by iron oxide particles, simultaneously reducing these particles to their metallic form. The metallic particles are oxidized by steam after breakthrough is seen, regenerating them into iron oxide, while producing pure hydrogen. To produce hydrogen continuously, two or more reactors can be operated in alternating modes. Coal gasification and particle reduction are combined in a single reactor in the CLR process. The reactions are performed in a moving-bed reactor, with particles flowing countercurrently to the reactant gas. After reduction by coal in the first reactor, the particles are transported pneumatically by inert gas to a second moving bed reactor where they are oxidized with steam, producing a near-pure hydrogen stream. Following this oxidation, the particles are transported back to the first reactor to repeat the reduction process. Extensive work was performed on particle development, where iron oxide was identified as the optimum metal oxide for use in the processes due to the combination of favorable thermodynamic equilibria, reaction rate, and stability at high temperatures. The SGR and the CLR processes were demonstrated in a bench scale reactor setup. Experiments proved that these processes can produce pure CO 2and H 2streams as predicted. Process simulations showed that the SGR and CLR can reach theoretical efficiencies ranging from 74% to 86%, respectively, with no additional carbon dioxide separation or extensive cleaning operations. Due to the high conversion efficiencies, good economics and environmental benefits, these processes are attractive for the large scale production of hydrogen from coal. Hence, this work also includes designs for a pilot scale reactor unit to perform large scale demonstrations. The unit is designed to produce continuously about 25 kW (thermal) of hydrogen from coal." @default.
- W2499256134 created "2016-08-23" @default.
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- W2499256134 date "2007-01-01" @default.
- W2499256134 modified "2023-09-27" @default.
- W2499256134 title "Development of chemical looping gasification processes for the production of hydrogen from coal" @default.
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