尾气回收料精馏工艺的模拟研究

Simulation of distillation process for recycled material from exhaust gas

为了降低改良西门子法精馏过程的能耗,模拟和优化了尾气回收料精馏过程中脱重-脱轻和脱轻-脱重2种工艺路线,比较了2种工艺路线的综合热负荷。结果表明,脱重-脱轻工艺脱轻塔的总热负荷小于脱轻-脱重工艺的脱轻塔的总热负荷,进料1时小了约43 k W,进料2时小了约34 k W,进料3时小了14 k W。脱重-脱轻工艺的脱重塔的总热负荷则明显大于脱轻-脱重工艺的脱重塔的总热负荷,进料1时高出约50 k W,进料2时高出约41 k W,进料3时高出约34 k W。对于尾气回收料精馏而言,脱重-脱轻工艺的综合热负荷大于脱轻-脱重工艺的综合热负荷,脱轻-脱重工艺是更好的精馏工艺路线。原因是,相对于脱轻-脱重工艺,脱重-脱轻工艺脱重塔需要处理的物料流量更大,塔顶温度要更低。

To lower the energy consumption in the modified Siemens process, the simulation and optimization of the distillation process for recycled materials from exhaust gas, including the process of removing light components after removal of heavy components and the process of removing heavy components after removal of light components, are performed. The results show that, under the same feed composition, separation requirements and operating pressure, the total heat duty of the column removing light components of the former process is lower than that of the column removing light components of the latter process for three kinds of feed composition. Meanwhile the total heat duty of the column removing heavy components of the former process is considerably higher than that of the column removing heavy components of the latter process. The latter process is suitable for the distillation of recycled material from exhaust gas because of its lower comprehensive heat duty, which is due to the larger material flow volume and lower overhead temperature of the column removing heavy components of the former process.