CO_(2)驱采气脱水过程模拟与工艺参数优化

Simulation and Parameter Optimization for Dehydration Process of CO_(2) Flooding Gas in Oilfield

在“双碳”目标的大趋势下,研究CO_(2)的转化与利用对促进低碳社会的构建具有重要的意义。以CO_(2)驱采气为原料,构建了CO_(2)驱采出气脱水与精馏提纯耦合工艺过程模型。基于现场工业装置数据,对CO_(2)驱采出气脱水工艺进行了模拟,探究了影响精馏塔顶物流中水含量的工艺参数,并得到了优化后的操作参数。在不增加塔板数目,维持塔操作压力4.52 MPa的最小工艺改动前提下,采用优化后的CO_(2)驱采出气脱水过程模型操作参数,仅需提升精馏塔物质的量回流比至0.34,即可满足精馏塔顶物流中水含量≤200×10^(-6)的这一工艺指标。此时工艺总能耗为7455.60 kW,较优化前的工艺总能耗增加了196.16 kW。

Under the general trend of"peak carbon dioxide emissions and carbon neutral"goal,the research on the transformation and utilization of CO_(2) is of great significance to promote the construction of low-carbon society.A coupled process model of dehydration and distillation purification of CO_(2) flooding gas in oilfield was established.Based on the industrial device data,the dehydration process of CO_(2) flooding gas in oilfield was simulated,the process parameters affecting the water content in the overhead logistics of distillation tower were explored,and the optimized operation parameters were obtained.Without increasing the number of plates and maintaining the minimum process change of the tower operating pressure of 4.52 MPa,the optimized parameters of the oilfield CO_(2) flooding gas dehydration process model are adopted.Only by increasing the molar reflux ratio of the distillation tower to 0.34,the process index of water content≤200×10^(-6) in the overhead stream of the distillation tower can be met.The total energy consumption of the process is 7455.60 kW,which is 196.16 kW higher than that before optimization.