利用高温铜渣余热进行生物质水蒸气汽化的热力学分析

Thermodynamic Analysis on Biomass Steam Gasification Using High-temperature Copper Slag Waste Heat

基于平衡常数法建立生物质水蒸气汽化的热力学平衡模型。模型计算结果表明:生物质水蒸气汽化产气组分趋于稳定的汽化条件为845～950℃、S/B(水蒸气质量与生物质质量之比)为1.5～2.0(g/g),900℃、S/B为1.64时合成气(CO+H2)产量最高,为73.15%。利用高温铜渣显热作为生物质水蒸气汽化吸热反应的外热源,计算不同汽化温度下铜渣的热焓和余热利用率。计算结果表明:汽化温度在720～950℃范围内,铜渣余热利用率为25.28%～60.04%;最优汽化工况下,铜渣余热利用率为31.66%,系统能量转化率高达48%。

A thermodynamic equilibrium model of biomass steam gasification was established based on equilibri um constant method. The calculated results show that biomass steam gasification gas are stable for 845--950 ℃ and S/B of 1.5--2.0（g/g） and the highest syngas （CO＋H2） yield is 73.15% for 900℃ and S/B=1.64. It was calculat ed that enthalpy of copper slag and sensible heat utilization efficiency of copper slag on different gasification tempcra ture using the sensible heat of high temperature copper slag as the heat source of biornass steam gasification. The ca} culated results show that waste heat utilization efficiency of copper slag is 25. 28%---60.04%within the gasification temperature range of 720--950℃and waste heat utilization efficiency of copper slag is 31.66 %and system energy ef fieiency is 48% on optimal conditiom