低温甲醇洗PSRK热力学方程改进与全流程模拟

The revised PSRK thermodynamic equation and whole process simulation of rectisol

低温甲醇洗工艺广泛应用于酸性气体净化,但在Aspen Plus软件中,软件自带的热力学方程不能准确模拟该流程。为了提高热力学方程计算的精确度,文中首先使用Aspen Plus软件内置的PENG-ROB,PK-ASPEN,PSRK热力学方程,模拟低温甲醇洗工艺中的脱硫塔和脱碳塔。模拟结果表明:这3个方程的模拟结果和实际数据均存在差距,但PSRK方程的模拟结果和实际数据最接近。在此基础上,文中修正了PSRK方程中部分二元交互作用参数,修正后的PSRK方程能够准确模拟脱硫塔和脱碳塔,关键流股中关键组分的模拟结果与实际数据吻合良好。另外,为了增加模拟的实用性,文中设置了撕裂流股和收敛模块,模拟了低温甲醇洗全流程,为低温甲醇洗流程的设计计算提供了可靠的技术支持。

Rectisol was widely used as sour gas purification, however, it cannot be accurately described with the thermodynamic equation in the Aspen Plus. In order to improve calculation precision of thermodynamic equation, PENG-ROB, PK-ASPEN, PSRK thermodynamic equations in the Aspen Plus were used to simulate the desulfurization tower and decarbonization tower. Despite the results demonstrate a gap between the simulation results of three equations and the actual data. PSRK equation is proved to be the best one of them. On this basis, the part of binary interaction parameters are corrected to accurately simulate the desulfurization tower and decarbonization tower, and the result of the key components in the key stream precisely matches the actual data. Additionally, in order to increase the usability of simulation, the paper sets tear streams and convergence modules to simulate, the whole process, which provided a reliable technology support for rectisol process design and calculation.