MDEA脱硫脱碳选择性研究

Selectivity of desulfurization and decarbonization by MDEA

利用Aspen HYSYS软件模拟研究天然气加工中贫胺液中MDEA的质量分数、塔板数、吸收压力、气液比等操作参数的变化规律,分析MDEA溶液脱硫脱碳的吸收选择性影响因素。模拟结果表明,在保证净化要求的前提下,吸收塔采用填料塔、适当降低塔板数、设置多股进料且进料位置下移、适当提高原料气温度和贫胺液入塔温度、适当提高气液比等措施均可提高MDEA溶液的选择性,增加产品气的收率,降低装置能耗。

The Aspen HYSYS software was used to simulate the variation of MDEA concentration in the lean amine solution,number of trays,absorption pressure,gas-liquid ratio and other operating parameters in natural gas processing,and the factors affecting the absorption selectivity of desulfurization and decarbonization by MDEA solution were analyzed.The simulation results show that under the premise of ensuring the purification requirements,using the packed tower as absorption tower,appropriately reducing the number of trays,seting multiple feeds and moving the feed position down,appropriately raising the temperatures of the feed gas and the lean amine solution into the tower,and increasing the gas-liquid ratio can improve the selectivity of the MDEA solution,increase the yield of product gas and reduce the energy consumption.