混合胺溶剂吸收CO_2的内冷流程模拟

Process simulation with intercoolers for CO_2 absorption with a mixed amine solution

为降低醇胺溶液吸收法捕集分离CO_2的能耗问题,采用在吸收塔增加内部冷却即内冷的方法,使用乙醇胺和甲基二乙醇胺混合溶剂水溶液,采用化工模拟软件AMSIM进行了CO_2吸收的过程模拟。分析了内冷位置、一级和二级内冷的冷却量、贫液流量和混合溶液浓度对捕集能耗的影响。结果表明采用混合胺溶剂和内冷流程的CO_2捕集能耗比乙醇胺传统流程的能耗降低了17%,说明将捕集溶剂和捕集流程结合起来进行研究,可以明显降低CO_2捕集能耗。

CO2absorption with alkanolamines was the most commonly used CO2 capture technology,while huge energy consumption limited its further application. In order to lower the energy consumption,intercoolers were added in the absorption tower. Process simulation was carried out with a commercial software AMSIM in the area of chemical engineering,and a mixed aqueous solvent of ethanolamine and methyldiethanolamine was used. Effects of intercooler positions,first and second intercooler heat amounts,lean amine solution flowrate and amine concentrations were analyzed. The results showed that energy consumption with the mixed solvent and intercoolers was deceased by17% compared with that of absorption process with the aqueous ethanolamine solvent and without intercoolers. The results showed that the integrated research on capture solvents and capture flowsheets could reduce energy consumption significantly.