CO_2捕集的吸收溶解度计算和过程模拟

Absorption solubility calculation and process simulation for CO_2 capture

为了降低CO2吸收法捕集技术的能耗和成本,以目前常用的单乙醇胺(MEA)溶液吸收CO2为例,采用电解质非随机双流体热力学模型(E-NRTL),对溶液中的CO2气体溶解度进行计算,计算过程包含了化学反应平衡和汽液平衡,计算结果和文献数据相吻合。在此基础上,建立了CO2吸收过程模拟程序和包括解吸能耗、气体压缩能耗以及液体输送能耗的过程总体能耗的计算方法,继而通过过程模拟分析了吸收塔和解吸塔压力、溶液浓度和流量等因素对吸收捕集过程的总体能耗的影响,获取了最优的工艺条件,为以后新CO2吸收捕集过程提供能耗分析方法基础。

In order to decrease energy consumption and cost for CO2 capture with Absorption,with monoethanol （MEA） solution as the example and electrolytic non-random two-liquid model（E-NRTL）,CO2 solubility is calculated.In the calculation,chemical reaction equilibria and gas-liquid phase equilibria are included,and calculation results are in good agreement with literature data.Then process simulation software for CO2 Absorption is established,and total energy consumption is calculated including those for regeneration,gas compression and liquid transportation.Different effects to total energy consumption,such as Absorption pressure,regeneration pressure,solution concentration and flow rate,are analyzed and optimized.All these methods can be used for further development of CO2 capture processes with the Absorption method.