低温甲醇净化合成油尾气重整气的模拟分析

Simulation of Rectisol Process for Purifying the Reformed Gas of Synthetic Oil Tail Gas

根据低温甲醇净化工艺流程,利用Aspen Plus软件建立了费托合成油尾气重整气的低温甲醇净化过程的数学模型,获得了净化气流量、各组分体积分数等关键参数,并与实际数据对比,二者相互吻合.采用灵敏度分析方法进行了分析优化,结果表明吸收塔装置处理负荷可提高8.84%.当吸收塔负荷不变、且净化气出口CO2的体积分数低于0.5%时,贫甲醇液的温度控制范围为-44～-41℃,吸收塔贫甲醇液量和热再生塔的蒸馏速率分别降低了11.96%和9.55%,净化过程总能耗下降9.43%.

Based on actual Rectisol process, its simulation for purifying the reformed gas of F-T synthesis tail gas using Aspen Plus software was carried out, some key parameters including flow rate of purified gas and volume fraction of each component were obtained, and the results calculated from Aspen Plus were in consistent with the actual data. The related parameters were optimized using sensitivity analysis method. At last, the capacity of adsorption tower could be improved by 8.84% at the existing operating conditions. The suitable temperature range of methanol was from -44 to -41 ℃, and the flow rate of methanol to the adsorption tower was decreased by 11.96%, at the same time, the distillation rate of thermal regeneration tower was decreased by 9.55%, when the load of reformed gas was steady and CO2 content in the purified gas was controlled by 0.5%（fp）, the energy consumption of the purified process was reduced by 9.43% under the optimized conditions.