混合胺法深度脱碳的工艺参数模拟优化

Parameter Optimization Simulation of Deep Decarbonization Process Using Mixed Amines Solvent

采用K-E模型对混合胺法深度脱碳的工艺流程进行了模拟,并以净化效果和塔顶排放气体的损耗为约束条件,以再沸器的加热功率为目标函数,在给定吸收塔和再生塔基本参数条件下,对回流比、再沸比及胺液配比进行了优化。因为加热功率最小点处于极限酸气负荷附近,此时再减少胺液循环量会使加热功率急剧增加,因而设计时应留有足够余量,但可以此作为胺液配比优化的依据,根据模拟结果,在DEA含量为10%～13%(质量分数)时净化效果最佳。

Simulations of natural gas deep decarbonization process with MDEA- DEA solvent are done with K-E model. When the constraint conditions are purification effect, the overhead gas losses, the objective function is the heating power of the reboiler,and the basic parameters of the absorber and regeneration tower are given, the reflux ratio, reboil ratio and mixture ratio of amine are optimized. As the minimum point of the heating power is near limit acid gas load, and the reduction of the amine solution circulating load will lead to rapid increase of the heating power, so it is nec-essary to leave enough design margin, which can provide ba-sis for the optimizations of the amine solution ratio.The purification effect is perfect when the concentration of DEA is 10%～13% according to simulation results.