CO2气氛下生物质气化制氢的数值分析

Numerical analysis on hydrogen production based on biomass gasification in CO2 atmosphere

中文关键词: 生物质气化  制氢  ASPEN PLUS  CO2

英文关键词: biomass gasification  hydrogen production  ASPEN PLUS  CO2

中文摘要:

      生物质气化制氢有重要的工业应用价值，本文采用ASPEN PLUS软件数值模拟了稻壳在流化床中的气化过程。本次模拟运用吉布斯自由能最小化原理，选择RGibbs和RYield模块，采用CO2作为气化剂，计算获得了气化温度、CO2质量流量、CO2和稻壳质量比和碳转化率对产氢率的影响规律。结果表明：在CO2质量流量为200kg/h时，H2的生成率高达43%。随着CO2/B增加，CO和CO2体积分数逐渐升高，CH4体积分数下降，H2体积分数在不同的气化温度下趋于平稳（600~700℃）或下降（800~1000℃）。随着气化温度升高，碳转化率增加；随着CO2和稻壳质量比的升高，碳转化率下降。

英文摘要:

      Hydrogen production based on biomass gasification has an important industry application.Biomass gasification in the fluidized bed was simulated numerically with ASPEN PLUS software, and the principle of the Gibbs free energy minimization and RGibbs and RYield modules were used. The gasifier agents adopted CO2. The influences of the mass flux of CO2, gasification temperature, the mass ratio of CO2 to rice husk and the carbon conversion rate on the yield of hydrogen were analyzed. The yield rate of hydrogen reached 43% when mass flux of CO2 was 200kg/h. As the mass ratio of CO2 to rice husk increased, the volume fractions of CO and CO2 rose gradually, the volume fraction of CH4 reduced, and the volume fractions of H2 tended to a stable state when the gasification temperature ranged from 600 ℃ to 700 ℃ and reduced when the gasification temperature changed from 800 ℃ to 1000 ℃. As the gasification temperature rose, the carbon conversion rate increased; and as CO2/B rose, the carbon conversion rate reduced.