影响N-甲基二乙醇胺脱碳装置二氧化碳吸收性能的工艺参数优化

基于N-甲基二乙醇胺(MDEA)脱碳工业装置,考察了贫胺液MDEA浓度、吸收塔贫胺液与合成气的质量比、吸收塔压力、再生塔蒸汽用量与贫胺液循环量的质量比等工艺条件对CO2脱除效果的影响。结果表明,随着上述各工艺参数的增大,净化气中CO2的含量均呈先快后慢的降低趋势,MDEA溶液对CO2的吸收性能明显增强。在吸收塔压力为3.1 MPa,温度为45℃,贫胺液中MDEA的质量分数为30%,贫胺液循环量为75 t/h,合成气的进料量为17 t/h,再生塔蒸汽用量与贫胺液循环量的质量比为0.08的优化条件下,合成气中CO2组分的摩尔分数由10.22%可降至0.01%,脱碳率大于99.5%。

Optimization for process parameaters of influencing absorption capacity of CO2 in a N-methyldiethanolamine decarbonization unit

The process paramerters,such as Nmethyldiethanolamine （MEDA） content in lean solution,mass ratio of lean amine solution to syngas,pressure of absorption tower and mass ratio of steam consumption to lean amine solution circulation in regeneration tower,which influenced CO2 absorption,were investigated in a MEDA decarbonization unit.The results showed that with the increase of above mentioned process parameters,CO2 content in purified syngas reduced fast first and then slowly,and the absorption of CO2 in MDEA solution was significantly enhanced.Under the optimal conditions of absorption tower pressure 3.1 MPa,temperature 45 ℃,mass fraction of MDEA in lean solution 30％,circulation of lean amine solution 75 t/h,feeding rate of syngas 17 t/h,mass ratio of steam consumption to lean amine solution circulation 0.08,the mole fraction of CO2 in purified syngas reduced to 0.01％ from 10.22％,and the decarbonization rate was above 99.5 ％.