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生物质气化是一种可有效利用生物质能源的热化学转化技术。该文利用大型化工流程模拟软件Aspen Plus建立生物质在流化床气化炉内空气水蒸气气化模型,并研究气化温度对产气组分的影响。将模拟结果与试验结果进行了对比,吻合良好,表明该模型具有一定的适用性。利用灵敏度分析功能研究了空气当量比(equivalence ratio,ER)和水蒸气/生物质质量比(S/B)对产气组分、热值以及气化效率的影响。结果表明:提高气化温度,产气中H2和CO2含量增加,而CO和CH4含量减小;在空气当量比为0.27时气化效率最高;当S/B取1.3~1.7范围时,产气热值较高,可达11.8MJ/m3。
Biomass gasification is a thermochemical conversion technology that makes efficient use of biomass energy. In this paper, a large-scale chemical process simulation software Aspen Plus was used to establish the air-water vaporization model of biomass in a fluidized bed gasifier and the influence of gasification temperature on the components of gas production. The simulation results are compared with the experimental results, and the results are in good agreement. It shows that the model has some applicability. The effects of air equivalence ratio (ER) and water vapor / biomass mass ratio (S / B) on gas composition, calorific value and gasification efficiency were studied using sensitivity analysis. The results show that: increasing the gasification temperature, the content of H2 and CO2 in the gas increases, while the content of CO and CH4 decreases; the gasification efficiency is the highest when the air equivalence ratio is 0.27; when the S / B takes the range of 1.3 to 1.7, Higher calorific value, up to 11.8MJ / m3.