湿法脱臭技术在酸性水汽提装置的应用及改进

Application and Improvement of Wet Deodorization Technology in Sour Water Stripping Unit

酸性水装置罐顶气相含有硫化氢、二氧化硫、氨氮、硫醇、硫醚等硫化物及烃类等恶臭组分,且含量高,易造成周边环境恶化,严重影响现场操作人员健康。采用固定床吸附脱臭技术,存在吸附剂易饱和、长期处理效果不佳的问题。经过考察和认证,在对各种恶臭治理技术进行综合比较后,使用湿法脱臭技术替代固定床吸附技术。湿法脱臭工艺是吸收法的一种,具有反应快、吸收效果好、操作简便、安全可靠等优点,可以达到很好的脱臭效果。湿法脱臭系统投用后,消灭了酸性水大罐臭气直排的现象,现场环境大为改观。但湿法脱臭技术还存在开工阶段尾气中氨含量偏高、脱臭剂罐内专利吸收剂跑失、脱臭后尾气中氨含量比水洗后高、脱臭后尾气中烃含量高等问题。通过现场原因分析并对湿法脱臭技术进行改进,使酸性水罐顶气相达标排放,现场环境得到彻底改善。

The gas in the top of sour water tank contains high concentrations of stench gases such as hydro-gen sulfide,sulfur dioxide,ammonia nitrogen,mercaptan and thioether,which easily lead to the deterioration of surrounding environment and seriously affect the health of operators.Fixed bed adsorption deodorization tech-nology was used to treat the gas,but the absorbent was easy to saturate and the long-term treatment effect was not good.Based on a comprehensive comparison of various odor control technologies,wet deodorization technology was used to replace the fixed bed adsorption technology.As one of the adsorption methods,wet deodorization technology has advantages of quick reaction,good adsorption effect,easy operation and high reliability,and can achieve good deordorization effect.The application of wet deodorization system eliminated the direct discharge of stench gases from sour water tank,greatly improving the environment.However,this technology had problems of high ammonia content in tail gas during startup,loss of patent absorbent in deordorant tank,higher ammonia content in tail gas than in washed gas,and high hydrocarbon content in tail gas.After improving the wet deodorization technology based on cause analysis,the gas in the top of sour water tank meets the discharged standard,and the environment is improved significantly.