Objective The aim is to solve the problems of high energy consumption,low purified gas flow rate and poor desulfurization selectivity in treating sour gas in natural gas purification plants.Based on Aspen HYSYS process simulation software,a steady-state simulation model of the desulfurization unit in a sour gas purification plant was established.Methods The multi-objective orthogonal test method and the comprehensive frequency analysis method were combined to optimize the four key process parameters of the desulfurization unit,such as the absorption tower tray number,the absorption tower pressure,the amine solution circulation rate and amine solution feed temperature,with the three indexes of the total energy consumption,the flow rate of the purified gas and the selection factor as the comprehensive evaluation indexes.The optimal combination scheme of the desulfurization unit process parameters was determined,and the comprehensive performance of the desulfurization unit before and after optimization was compared and analyzed.Results Firstly,the steady-state simulation model could accurately simulate the desulfurization unit's operation characteristics and meet the engineering application requirements.Secondly,the factors influencing the total process energy consumption ranked in descending order were amine solution circulation rate,absorption tower tray number,absorption tower pressure,and lean amine solution feed temperature;the factors affecting the purified gas flow rate and selection factor are both ranked from top to bottom as absorption tower tray number,absorption tower pressure,amine solution circulation rate,and lean amine solution feed temperature.Thirdly,the optimal combination of the key process parameters for the desulfurization unit was as follows:absorption tower tray number was 12,absorption tower pressure was 5.5 MPa,amine solution circulation rate was 75 t/h,and lean amine solution feed temperature was 28℃.Fourthly,after optimization,the total process energy consumption decreased from 11 316.54 kW to 9 590.61 kW,with a drop of 15.25%;the purified gas flow rate increased from 4 164.53 kmol/h to 4 175.54 kmol/h,with a rise of 0.26%;the selection factor increased from 1.32 to 2.20,with a rise of 66.67%.Conclusions Through the optimization of process parameters,the energy consumption of the desulfurization unit is apparently reduced,the purified gas flow rate is improved to some extent,and the desulfurization selectivity is significantly improved.
natural gas desulfurizationorthogonal testenergy consumption analysispurified gas flow ratedesulfurization selectivityprocess optimization
维普
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