关键词: 储运罐区, VOCs回收装置, 变压吸附, 油气吸收, 催化氧化, 非甲烷总烃, 吸收温度, 吸附剂

Abstract:

In recent years, with the improvement of environmental protection requirements, the Ministry of Environmental Protection of the People's Republic of China has issued relevant pollutant emission standards. The emission requirements for volatile organic compounds(VOCs) have been raised from 25,000 mg/m³ to 120 mg/m³. The eastern coastal areas of China have implemented stricter emission standards. A complete set of VOCs recovery unit was built for the oil and gas produced by volatilization during storage and transportation. Due to certain design defects of the original VOCs recovery device, the VOCs emission in the exhaust gas does not meet the standard requirements, and the mass concentration reaches 3,000～5,000 mg/m³, which can only be discharged after being treated by the catalytic oxidation device. After in-depth analysis of the causes of non-compliance of the exhaust gas of VOCs device, by optimizing the process flow of VOCs recovery device and improving the ratio of adsorbent, the VOCs content of the exhaust gas of VOCs recovery unit can be controlled within 50 mg/m³, which can achieve direct standard discharge, so as to effectively reduce the load of catalytic oxidation device, and fully recover oil and gas hydrocarbon resources, which has good economic and environmental protection value.

Key words: storage tank farm, VOCs recycle unit, pressure swing adsorption, oil and gas absorption, catalytic oxidation, NMHC, absorbing temperature, adsorbent;