醇胺法捕集高炉煤气CO_(2)工艺吸收剂的优选

Optimization of Absorbent for CO_(2) Capture from Blast Furnace Gas by Alcohol Amine Process

为推进碳达峰和碳中和,以高炉煤气碳捕集过程中常用的醇胺吸收剂(MEA,DEA,MDEA)为研究对象,应用Aspen Plus软件建立碳捕集模型,研究吸收剂流量、含量及再沸器热负荷对碳捕集率及解吸率的影响,比较分析不同吸收剂解吸CO_(2)后的再生能耗,筛选综合性能良好的吸收剂。结果表明:相同条件下,3种醇胺吸收剂的吸收性能和解吸性能各具优劣,吸收性能为MEA>DEA>MDEA,解吸性能为DEA>MDEA>MEA;兼顾吸收与解吸性能的再生能耗,3种醇胺吸收剂对CO_(2)的吸收解吸综合性能为MEA>MDEA>DEA;相较DEA和MDEA醇胺吸收剂,MEA醇胺吸收剂更适用在高炉煤气脱碳应用中。

In order to promote carbon peaking and carbon neutralization,alcohol amine absorbents(MEA,DEA,MDEA)commonly used in the process of carbon capture of blast furnace gas were used as research objects.The carbon capture model was established by Aspen Plus software.The effects of absorbent flow rate,content and heat load of reboiler on carbon capture rate and desorption rate were studied,and the regeneration energy consumption of different absorbents after CO2 desorption was compared and analyzed to select the absorbent with good comprehensive performance.The results show that under the same conditions,the absorption performance and desorption performance of three kinds of alcohol amine absorbents have their own advantages and disadvantages,the absorption performance isMEA>DEA>MDEA,and the desorption performance isDEA>MDEA>MEA;Considering the regeneration energy consumption of absorption and desorption performance,the comprehensive performance of CO_(2) absorption and desorption of three kinds of alcohol amine absorbents is MEA>MDEA>DEA;Compared with DEA and MDEA alcohol amine absorbents,MEA alcohol amine absorbent is more suitable for blast furnace gas in the application of decarbonization.