MDEA火炬气脱硫装置的模拟与优化

Simulation and Optimization of MDEA Flare Gas Desulfurization Device

以中国石化扬子石油化工有限公司芳烃厂0.25 Mt·a^(-1)的火炬气脱硫装置为研究对象,以扩散理论和离子反应为基础,利用Aspen Plus流程模拟软件对火炬气脱硫装置工艺流程建立稳态模型,通过研究进料条件、MDEA的质量分数、吸收压力等操作参数变化,分析MDEA溶液吸收选择性的影响。结果表明:建立的模型数据计算结果与生产实际相吻合,控制贫液温度35℃左右,提高吸收压力(0.8~0.9MPa(G))可提高MDEA的吸收效果;适当增加MDEA质量分数,可减少MDEA溶液循环量,减少再生塔蒸汽用量,降低装置能耗;当进料组分发生变化时,应及时增加MDEA溶液循环量,确保净化火炬气产品质量合格。

Taking 0.25 Mt·a^(-1)flare gas desulfurization device of Sinopec Yangzi Petrochemical Co., Ltd. aromatics plant as the research object, based on diffusion theory and ion reaction, the Aspen Plus process simulation software was used to establish a steady-state model of the flare gas desulfurization device process. By studying the changes in operating parameters such as feed conditions, MDEA mass fraction, absorption pressure, etc., their influence on MDEA solution absorption selectivity was analyzed. The results showed that the calculated results of the established model data were consistent with the actual production. Controlling the lean liquid temperature to about 35℃ and increasing the absorption pressure(0.8~0.9 MPa(G)) could improve the absorption effect of MDEA;appropriately increasing the MDEA mass fraction could reduce the circulation of MDEA solution toreduce the steam consumption of the regeneration tower and reduce the energy consumption of the device;When the feed composition changed, the MDEA solution circulation volume should be increased in time to ensure the qualified quality of the purified flare gas product.