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运用流程模拟软件对干气-液化气胺液循环系统进行了严格模拟,分析了富液H_2S含量、贫液H_2S含量、MDEA浓度、富液进塔温度对溶剂再生能耗的影响,并对液化气脱硫塔富液的串级利用进行了模拟。结果表明:在脱硫指标满足的条件下,干气-液化气脱硫系统富液H_2S含量可提高至20g/L左右,贫液H_2S含量控制在1.1g/L左右为最佳;固定脱硫塔净化气中H_2S含量不变,胺液系统存在最佳的贫液H_2S含量,在此贫液H_2S含量下,蒸汽消耗最低;MDEA浓度主要影响脱硫塔效果,进而影响胺液循环量,在系统不出现发泡时,应尽可能提高MDEA浓度;从节省蒸汽的角度讲,富液进再生塔温度越高越好,实际进塔温度可优化至设计值;胺液串级利用解决了富液不富、硫容分配不均等胺液系统现存的问题,由于循环氢脱硫塔贫液质量要求不高,可将H_2S含量不高的富液进行串级再利用。
The process simulation software was used to simulate the circulation system of dry gas - liquefied gas and liquid amine. The influence of H_2S content in liquid, the content of H_2S in lean liquid, the concentration of MDEA and the temperature of rich liquid on the regeneration of solvent was analyzed. Gas desulphurization fluid rich cascade use of the simulation. The results show that under the condition of satisfying the desulfurization index, the content of H_2S in the rich liquid of the dry gas-liquefied gas desulfurization system can be increased to about 20g / L, while the content of H_2S in the lean liquid can be controlled at about 1.1g / L. H_2S content in the same amine solution system, there is H_2S content of the best lean solution in the liquid ammonia system, the lowest vapor consumption under the H_2S content of the lean liquid; MDEA concentration mainly affect the desulfurization tower effect, and then affect the amine solution circulation, Bubble, should be as high as possible MDEA concentration; from the perspective of saving steam, rich liquid into the regeneration tower temperature as high as possible, the actual tower temperature can be optimized to the design value; tandem use of amine solution to solve the rich liquid is not rich, The existing problems of the amine liquid system with unequal distribution of sulfur capacity are that the liquid rich in H 2 S can be cascaded and reused due to the poor quality of the lean liquid in the circulating hydrogen desulfurization tower.