基于Aspen HYSYS软件的天然气脱酸流程模拟与优化

基于Aspen HYSYS软件,针对天然气中的烃类和胺类组分分别选用Peng-Robinson状态方程和Acid Gas-Chemical Solvents状态方程,对处理量为100×104 m3/d的天然气脱酸装置进行模拟,分别考察胺液中哌嗪质量分数、胺液循环量、吸收塔和再生塔理论板数、贫胺液进吸收塔温度等操作参数对...

Simulation and optimization of natural gas deacidification process based on Aspen HYSYS

The Peng-Robinson equation of state and the Acid Gas-Chemical Solvents equation of state were selected for the hydrocarbon and amine components in natural gas in Aspen HYSYS software to simulate the natural gas deacidification unit of which the processing capacity was 100×104 m3/d. The effects such as piperazine mass fraction in amine liquid， circulating volume of amine liquid， theoretical plate number of absorption tower and regeneration tower， and operating parameters of lean amine liquid entering absorption tower temperature on natural gas deacidification were investigated and simulation optimization was carried out. The results showed that the CO2 volume fraction at the top of the absorption tower of the natural gas deacidification unit was 23 × 10-6 and the H2S volume fraction was less than 1 × 10-6. The simulated and optimized operating conditions were as followed: the operating pressure of the amine liquid flash tank was 500 kPa， the bottom pressure of the regeneration tower was 100 kPa， the mass fraction of CO2 in N-methyldiethanolamine （MDEA） in the lean amine liquid regenerated at the bottom of the regeneration tower was 0.3%， the heat load of the bottom reboiler was 4 891 kW， the temperature of the lean amine liquid entering the absorption tower was 50 ℃， the circulation rate of MDEA was 80 m3/h， the mass fraction of MDEA was 36%， the mass fraction of piperazine was 4% and the theoretical plates of the absorption tower and the regeneration tower were both 10 pieces.