期刊
APPLIED ENERGY
卷 326, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2022.120046
关键词
Biochar steam gasification; In -situ catalysis; Counter -flow gasification; Hydrogen -rich gas; Gasification intensity
资金
- Natural Science Foundation of Inner Mongolia
- [2020MS05043]
This study explores a method for steam gasification of biomass, and enhances the efficiency of biochar fixed bed gasification by adding catalysts. Experimental results show that adding CaO in counter-flow gasification can improve gasification intensity, while the addition of Fe2O3 can increase hydrogen production yield.
It is important to explore a relatively cheap and efficient biomass steam gasification process for the high-value utilization of biomass. Biochar was used as raw material for steam gasification, and the steam gasification of counter-flow biochar fixed bed was enhanced by the in-situ catalysis of Fe2O3 and CaO. By changing the steam flow rate and heating temperature, the operating characteristics of counter-flow gasification were explored and compared with updraft and downdraft gasification. The experimental results show that the addition of CaO in counter-flow gasification can improve the gasifi-cation intensity of biochar at lower temperature and steam flow rate. At 750 degrees C, the biochar loaded with CaO at steam flow rate of 3.75 ml/min has a maximum heating temperature LHV of 11.49 MJ/Nm3. As the heating temperature increases, the hydrogen production yield gradually decreases. At temperature of 850 degrees C and steam flow rate of 3.75 ml/min, the gasification intensity of CaO loaded biochar was 66.44 % higher than that of unloaded biochar, and the gasification intensity was increased by 15.04 % by loading Fe2O3. However, the addition of Fe2O3 can improve the hydrogen production yield of biochar. At 850 degrees C gasification temperature, the hydrogen production yield is 23.25 % higher than that of biochar without catalysis.
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