耦合技术对炼化企业蒸汽吹扫废气的处理

为了解决炼化企业停车检修蒸汽吹扫废气难处理这一行业难题，采用喷淋水洗、膜分离、低温催化氧化组成的移动式废气处理技术，对某炼厂裂解重馏分罐蒸汽蒸煮和吹扫过程所产生废气进行处理。结果表明：进气非甲烷总烃浓度可达24 000 mg·m⁻³，温度为 80~95 ℃；尾气中非甲烷总烃指标全部低于12 mg·m⁻³，去除率达99%以上，烃类物质的回收率可达75%；喷淋单元的功能是降低废气温度，去除酸性气体并回收重质烃类；膜分离单元有效提升装置运行稳定性，提高有机物回收效率；低温催化技术可对不可凝烃类进行深度处理。该处理技术能够为困扰炼厂的停检修蒸汽吹扫废气的治理提供参考。

Treatment of waste gas from steam purging in refining and chemical enterprises by coupling technology

To solve the difficult problem of treating high-temperature and high concentration organic waste gas from steam purging in refining and chemical enterprises, an advanced mobile waste gas treatment technology with spray water washing, membrane separation and low-temperature catalytic oxidation, was used to treat waste gas produced during the steam cleaning and purging of splitting decomposition heavy distillate tank in a refining and chemical plant. The results showed that the concentration of non methane total hydrocarbon at inlet could reach about 24 000 mg·m−3, the temperature was between 80~95 ℃; the concentrations of non methane total hydrocarbon in exhaust gas were all lower than 12 mg·m−3, the removal rate could reach above 99%, and the recovery rate of hydrocarbon could reach 75%. The function of spray unit was to reduce the temperature of waste gas, remove acid gas and recover heavy hydrocarbon. The membrane separation unit could effectively to improve the operation stability of the device and the recovery efficiency of organic matters; the low temperature catalytic oxidation could performance advance treatment of non-condensable hydrocarbons. This technology can provide reference for control the waste gas from steam purging which troubles the petrochemical company.