PROCESS SIMULATION OF BIOMASS O2/CO2 STAGED GASIFICATION IN DOWNDRAFT FIXED BED

Zheng Zhihang; Zhang Jiayuan; Li Junyu; Gong Ka; Luo Xiaoqian; Li Qian

doi:10.19912/j.0254-0096.tynxb.2020-1068

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (6) : 239-245. DOI: 10.19912/j.0254-0096.tynxb.2020-1068

PROCESS SIMULATION OF BIOMASS O₂/CO₂ STAGED GASIFICATION IN DOWNDRAFT FIXED BED

Zheng Zhihang¹, Zhang Jiayuan¹, Li Junyu¹, Gong Ka¹, Luo Xiaoqian¹, Li Qian²

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Abstract

An Aspen Plus gasification model for dry birch chips in a downdraft fixed-bed gasifier was developed, in which the predicted the gas composition and gas calorific value and agreement well with the literature results. The sensitivity analysis module was used to simulate the effects of oxygen carbon ratio and CO₂/C on gasification results, and the staging gasification process of O₂/CO₂ was proposed. Compared with the conventional CO₂ gasification characteristics, the influence of CO₂/C on gasification results was analyzed. The results show that the gasification gas with high H₂ and CO concentrations can be obtained with pure oxygen gasification, but its net CO₂ emission is high, and the carbon conversion ratio gradually increases and the cold gas efficiency first increases and then decreases with the increase of oxygen to carbon ratio. When CO₂ is used as gasification agent, the net CO₂ emission decreases gradually with the increase of CO₂/C, but the carbon conversion and cold gas efficiency decrease greatly. Compared with conventional CO₂ gasification, O₂/CO₂ staged gasification can effectively increase carbon conversion and cold gas efficiency while maintaining low CO₂ emission.

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biomass / sensitivity analysis / gasification / Aspen Plus / downdraft fixed bed

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Zheng Zhihang, Zhang Jiayuan, Li Junyu, Gong Ka, Luo Xiaoqian, Li Qian. PROCESS SIMULATION OF BIOMASS O₂/CO₂ STAGED GASIFICATION IN DOWNDRAFT FIXED BED[J]. Acta Energiae Solaris Sinica. 2022, 43(6): 239-245 https://doi.org/10.19912/j.0254-0096.tynxb.2020-1068

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