离子液体吸收法碳捕集系统的热力学分析

Thermodynamic analysis of carbon capture system based on ionic liquid absorption

中文关键词: 二氧化碳捕集  离子液体  过程系统  

英文关键词: CO2 capture  ionic liquids  process systems  

中文摘要:

      离子液体是极具潜力的CO2捕集溶剂，设计了适用于离子液体的CO2捕集系统，并对四种离子液体的热力学性能进行了分析。利用NRTL模型对热力性能计算所需的溶解度数据等物性进行了关联计算。在1.0MPa-6.0MPa的吸收压力范围内，离子液体捕集CO2的总能耗随吸收压力升高先减小后增大；在343.15K-403.15K的解吸温度范围内，解吸CO2的热耗会随解吸温度的升高而升高。对于[Emim][DEP], 解吸温度为403.15K时系统解吸热耗为6.710GJ/tCO2，相比于解吸温度为343.15K时升高了3.845倍。此外我们还确定了离子液体的最优捕集工况。在最优工况下，四种离子液体中[Emim][DEP]的捕集能耗最低，其最优吸收压力和解吸温度分别为3300kPa、343.15K，此时捕集的总能耗为2.217GJ/tCO2。

英文摘要:

      Ionic liquids are highly promising solvents for CO2 capture, and a CO2 capture system applicable to ion-ic liquids was designed and the thermodynamic performance of four ionic liquids were analyzed. Ther-modynamic properties such as solubility data required for thermodynamic analysis were correlated using the NRTL model. For the absorption pressure range of 1.0MPa-6.0MPa, the total energy consumption of CO2 capture by ionic liquids decreases and then increases with the increasing absorption pressure; For the desorption temperature range of 343.15K-403.15K, the heat consumption of desorbing CO2 increas-es with the increasing desorption temperature. For [Emim][DEP], the heat consumption of desorbing CO2 is 6.710GJ/tCO2 when the desorption temperature is 403.15K, which is 3.845 times higher than that when the desorption temperature is 343.15K. In addition, we determined the optimal CO2 capture condi-tions for the ionic liquid. Under the optimal conditions, [Emim][DEP] has the lowest energy consump-tion among the four ionic liquids, and its optimal absorption pressure and desorption temperature are 3300kPa and 343.15K, at which the total energy consumption of CO2 capture is 2.217 GJ/tCO2.