膜吸收法从烟气中分离二氧化碳的性能分析

Performance analysis of CO_2 separation from glue gas with membrane absorption method

膜吸收法是从烟气中分离二氧化碳的一种有效方法。建立了热再生和真空闪蒸能耗模型,分析了不同因素对再生能耗的影响。其中反应热分别为热再生和真空闪蒸再生能耗的46%和59.2%,是再生能耗的主要部分。热再生流程再生总能耗为4.140 4 MJ/kgCO2,膜真空闪蒸再生流程再生总能耗为3.241 1 MJ/kg-CO2,约为热再生流程的78%。在两种流程中,再生能耗在热再生流程和真空闪蒸再生流程所占比重分别为60%和62.74%,虽然真空闪蒸流程中再生能耗比重有所上升,但总能耗仍低于热再生流程。最后考察了膜吸收流程和化学吸收流程的经济性,结果表明膜吸收-真空闪蒸流程具有较强的竞争性。

Membrane absorption is an effective way to capture CO2 from flue gas. Regeneration energy consumption models of heat- regeneration and vacuum flash processes were established. Effects on regeneration energy consump- tion under various conditions were discussed. The heat of reaction accounted for 46 % and 59. 2 % of the regeneration energy consumption, respectively. The total regeneration energy consumption of vacuum flash process was 3. 2411 MJ/kgCO2, which was 78% of the heat- regeneration process （4, 1404 MJ/kgCO2）. The proportions of regenera- tion energy consumption in the two processes were 60 % and 62. 74 %, respectively. Although the proportion of re- generation energy consumption in membrane vacuum flash scheme increased, the total energy consumption was still lower than heat - regeneration process. The economic analysis was investigated between membrane absorption processes and chemical absorption process, and the results indicate that membrane absorption - vacuum flash process has competitive advantage.