A two-tower sour water stripping unit is studied in this paper. Based on a detailed analysis for the mechanism of sour water stripping process, the process is simulated by sour water package in PRO/Ⅱ software, focusing on the factors affecting the energy consumption of the unit, such as for H2S stripping tower, the ratio of cold feed, inlet temperature of hot feed and feeding position; for NH3 stripping tower, the ratio of recycle condensed wastewater, feed temperature and inlet position. The optimal operation parameters are proposed as follows: for H2S stripping tower, the ratio of the cold feed is 0. 02, the hot feed temperature is 408 K; for NH3 stripping tower, the feed temperature is 435 K, the optimal feed inlet position is at 2nd plate and without recycle of condensed waste water. Options for saving energy-use are also obtained; canceling the heat exchange between hot feed water of H2S stripping tower and NH3 containing waters adding heat exchange among top gas of NH3 stripping tower, steam condensate of reboilers and the hot feed water of H2 S stripping tower. Simulation results show that after adopting these measures, the energy consumption of this unit reduces by 22. 3%.%在分析污水汽提机理的基础上,运用流程模拟软件PRO/Ⅱ、选择酸水工艺包对污水汽提双塔工艺流程进行模拟.重点探讨H2S汽提塔冷污水进料比例、热进料温度、热进料位置和NH3汽提塔进料温度、进料位置、循环冷凝污水比例等对污水汽提装置能耗的影响,提出以下装置优化工艺参数:H2S汽提塔冷污水进料比例0.02,热进料温度408 K;NH3汽提塔进料温度435 K,进料位置为第2块塔板,取消循环冷凝污水.基于流程模拟分析提出污水汽提双塔工艺流程用能改进措施:取消H2S汽提塔热进料污水与含NH3污水换热,增加NH3汽提塔塔顶气、装置蒸汽冷凝水与H2S汽提塔热进料污水换热.模拟结果表明,采用以上措施进行用能改造后,装置能耗降低了22.3％.
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