(467b) Process Design of Hydrogen Production from Coal and Co2 Separation
AIChE Annual Meeting
2006 Annual Meeting
Sustainability [CoSponsored by The Society of Chemical Engineers, Japan (SCEJ)]
Sustainable Power Systems
Wednesday, November 15, 2006 - 3:35pm to 3:55pm
Hydrogen is being considered as nonfossil alternative fuels worldwide in a future. Because of increasing hydrogen consumption it will be required to produce more than the present production of hydrogen. We proposed the effective hydrogen production process from coal gasification. In the process the carbon dioxide separation step using gas hydrate and the sift reaction step for producing more hydrogen were integrated with the gasification step. In gasification step the raw gas consisted mainly of hydrogen and carbon monoxide under high pressure is obtained. In sift reaction step, the raw gas further reacted with steam, and the synthetic gas of hydrogen and carbon dioxide is produced. Carbon dioxide is removed from the synthetic gas by forming carbon dioxide hydrate in the separation step. In addition, the thermodynamic equilibrium of the gas constituents was calculated in each step. The effect of solid carbon activity under high pressure was considered. The constituents of the raw gas were predicted. Based upon above results the operating condition for producing the largest amount of hydrogen in the proposed process was determined.