海上天然气田乙二醇再生及回收工艺的设计与模拟

Design and Simulation of Ethylene Glycol Regeneration and Recovery Process Applied in Offshore Natural Gas Fields

在乙二醇再生及回收过程中,为了能达到最大限度抑制结垢和腐蚀的发生,减少占地面积和降低运营成本,提出通过带侧线采出的精馏塔完成乙二醇脱水和脱盐的新思路。通过对一步脱水脱盐工艺和全流脱盐工艺不同之处进行对比分析,利用Aspenplus软件确定两个工艺的最佳参数,然后对两个工艺进行了灵敏度分析,确定两种工艺的能耗及年总成本在不同参数下的变化情况。与全流脱水脱盐工艺相比,一步脱水脱盐工艺全年总费用降低了11.5%。同时,在不同进料流量、富乙二醇中的含水量和产出水的盐浓度的情况下,一步脱水脱盐再生工艺的年总成本均低于全流脱盐工艺,更具成本效益。

In the process of ethylene glycol regeneration and recovery, in order to be able to achieve the maximum suppression of scaling and corrosion, reduce the floor space and reduce the operating cost, a new idea of completing ethylene glycol dehydration and desalination through a distillation column with side-stream extraction was proposed. The differences between one-step dehydration and desalination process and full-stream reclamation process were compared and analyzed. The Aspen plus software was used to determine the optimal parameters of the two processes, and then sensitivity analysis was performed to determine the variation of energy consumption and total annual cost of the two processes with different parameters. The total annual cost of the one-step dehydration and desalination process was reduced by 11.5% compared to the full-stream reclamation process. Also, the total annual cost of the one-step dehydration and desalination regeneration process was lower than that of the full-stream reclamation process for different feed flows,water content in the rich glycol and salt concentration of the output water, which was more cost effective.