工业源含苯VOCs回收工艺的模拟优化

Process Simulation of Industrial Toluene Absorption and Condensation Complex System

针对传统苯系VOCs的处理方式落后、资源浪费、经济性差、易产生二次污染等问题,通过优化现有的吸收工艺,利用Aspen Plus化工模拟软件对整体吸收回收系统过程进行了模拟计算,考察了原料液气比、原料气苯系物浓度、吸收剂用量、吸收塔环境温度变化的影响规律。模拟结果表明,在现有的原料气进气条件下,控制工艺进料的液气比为0.015,吸收压力为1MPa,进气温度为30℃,解吸塔进料塔板数为12,解吸塔回流比为5.51,精馏塔进料塔板数为13,精馏塔回流比为3,冷凝温度-87.5℃,冷凝压力500kPa,可达到最优的工艺效果,VOCs废气可直接达标排放。

In order to achieve efficient recycling,the existing absorption process was optimized and the overall absorption and recovery system was simulated using Aspen Plus chemical simulation software.The effect of the variation of raw material to liquid to vapor ratio,raw gas benzene concentration,absorber dosage and absorber tower ambient temperature was investigated.The simulation results showed that under the existing feed gas conditions,the process could be optimized with a feed liquid to vapor ratio of 0.015,an absorption pressure of 1MPa,a feed gas temperature of 30℃,desorption tower feed plate number of 12,desorption tower reflux ratio of 5.51,a distillation tower feed plate number of 13,a distillation tower reflux ratio of 3,a condensing temperature of-87.5℃and a condensing pressure of 500kPa.The process effect was optimal,and the VOCs could be directly discharged to the standard.The results showed that the composite absorption system had excellent absorption and recovery effect,and could realize the efficient enrichment and recycling of industrial source benzene.