建立干桦木屑在下吸式固定床气化炉中的Aspen Plus气化模型,该模型预测煤气组成和煤气热值,与文献试验结果吻合良好。利用灵敏度分析模块模拟了氧碳比、CO2/C对气化结果的影响,并提出O2/CO2分段气化流程,对比常规的CO2气化特征,分析了CO2/C对气化结果的影响。结果表明,纯氧气化时可获得高H2和CO浓度的气化气,但其净CO2排放量较高,氧碳比增加使碳转化率逐渐增加、冷煤气效率先增加后降低;CO2作为气化剂时,随着CO2/C的增加,净CO2排放量逐渐减少,但碳转化率及冷煤气效率大幅降低;与常规CO2气化相比,O2/CO2分段气化在保持低CO2排放量的同时,可有效增加气化过程中的碳转化率及冷煤气效率。
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.
关键词
生物质 /
灵敏度分析 /
气化 /
Aspen Plus /
下吸式固定床
Key words
biomass /
sensitivity analysis /
gasification /
Aspen Plus /
downdraft fixed bed
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