PROCESS SIMULATION OF COAL BOTTOM ASH-CATALYZED BIOMASS GASIFICATION COUPLING WITH EX-SITU AND IN-SITU CARBON CARPTURE FOR H2 PRODUCTION

Zhang Chuanhao; Liu Ji; Fu Guozhi; Hu Bin; Ma Zonghu; Du Xiaoze

doi:10.19912/j.0254-0096.tynxb.2023-1684

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (2) : 1-9. DOI: 10.19912/j.0254-0096.tynxb.2023-1684

PROCESS SIMULATION OF COAL BOTTOM ASH-CATALYZED BIOMASS GASIFICATION COUPLING WITH EX-SITU AND IN-SITU CARBON CARPTURE FOR H₂ PRODUCTION

Zhang Chuanhao¹, Liu Ji¹, Fu Guozhi², Hu Bin¹, Ma Zonghu², Du Xiaoze³

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Abstract

The biomass gasification catalyzed by coal bottom ash for H₂ production was studied by Aspen Plus software herein. The ex-situ and in-situ carbon capture was coupled with the catalytic gasification model. The effects of temperature, pressure, CaO/biomass ratio, steam/biomass ratio and addition ratio of coal bottom ash on the composition of syngas and the H₂ yield were studied. As the results, coal bottom ash is beneficial for the H₂ production from biomass gasification, and the H₂ yield can be significantly increased by coal bottom ash. The ex-situ calcium looping almost does not affect the H₂ yield but significantly reduces CO₂ emission. The H₂ volume fraction can be up to 81.0%, with a highest H₂ yield of 106.0 g/kg. The H₂ production technigue enhanced by in-situ CaO sorption promotes the biomass gasification reaction and raises the H₂ yield up to 110.5 g/kg with an H₂ volume fraction of 85.7%. Whereas, its decarbonization ability cannot match the former. According to the levelized cost of hydrogen, in-situ carbon capture has lower cost for H₂ production, and the influence of scale is greater on the ex-situ calcium looping.

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biomass energy / gasification / hydrogen production / carbon capture / coal bottom ash / techno-economic analysis

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Zhang Chuanhao, Liu Ji, Fu Guozhi, Hu Bin, Ma Zonghu, Du Xiaoze. PROCESS SIMULATION OF COAL BOTTOM ASH-CATALYZED BIOMASS GASIFICATION COUPLING WITH EX-SITU AND IN-SITU CARBON CARPTURE FOR H₂ PRODUCTION[J]. Acta Energiae Solaris Sinica. 2025, 46(2): 1-9 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1684

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