加油站三次油气回收设备是针对加油站储油罐内呼出的高浓度油气进行深度处理的终端治理装备。在加油站油气回收体系中，一次回收针对卸油阶段，二次回收针对加油阶段，而三次回收则是对储油罐内积累的油气进行后处理。当储油罐内气压达到设定值（通常为+150Pa）时，三次油气回收设备自动启动，将油罐内的油气转化为液态汽油回注储油罐或集液罐。

The tertiary oil and gas recovery equipment at gas stations is a terminal treatment equipment that deeply processes high concentration oil and gas exhaled from the storage tanks at gas stations. In the gas station oil and gas recovery system, the first recovery is for the unloading stage, the second recovery is for the refueling stage, and the third recovery is for the post-treatment of the accumulated oil and gas in the storage tank. When the pressure inside the oil storage tank reaches the set value (usually+150Pa), the tertiary oil and gas recovery equipment automatically starts, converting the oil and gas in the tank into liquid gasoline and injecting it back into the storage tank or collection tank.

在技术工艺方面，目前主流的加油站三次油气回收设备主要采用“冷凝+膜分离”双重工艺或“压缩冷凝+膜分离”组合工艺。以“压缩冷凝+膜分离”工艺为例，其全流程为：储油罐内的高浓度油气首先经压缩机加压升温，随后进入冷却器冷凝液化，液态油品回流至储油罐；未冷凝的气体进入膜分离单元，利用高分子膜实现碳氢化合物与空气的高效分离；分离出的烃类物质返回储油罐回收，净化后的空气达标排放。部分设备还集成了吸附单元作为深度处理保障，确保尾气排放浓度满足日趋严格的环保标准。

In terms of technical processes, the current mainstream gas station tertiary oil and gas recovery equipment mainly adopts the dual process of "condensation+membrane separation" or the combination process of "compression condensation+membrane separation". Taking the "compression condensation+membrane separation" process as an example, the entire process is as follows: the high concentration oil and gas in the storage tank is first pressurized and heated by the compressor, then enters the cooler for condensation and liquefaction, and the liquid oil returns to the storage tank; The uncondensed gas enters the membrane separation unit and efficiently separates hydrocarbons from air using a polymer membrane; The separated hydrocarbon substances are returned to the oil storage tank for recovery, and the purified air meets the emission standards. Some equipment also integrates adsorption units as a deep treatment guarantee to ensure that the exhaust emission concentration meets increasingly strict environmental standards.

在性能指标方面，主流的三次油气回收设备要求油气处理能力不低于8m?/h，油气回收率超过96%。尾气排放浓度方面，国家标准限值为25g/m?，但部分地区已加严至10g/m?以下。深圳在全省率先完成加油站三次油气回收治理后，年减排挥发性有机物约320吨，充分体现了该设备的环保效益。专家指出，开展三次油气回收具有“一举三得”的效果——环境效益上实现VOCs减排，安全效益上降低储油罐压力、消除安全隐患，经济效益上回收油品减少损耗。

In terms of performance indicators, mainstream tertiary oil and gas recovery equipment requires an oil and gas processing capacity of not less than 8m?/h and an oil and gas recovery rate of over 96%. In terms of exhaust emission concentration, the national standard limit is 25g/m? But in some areas, it has been tightened to 10g/m? following. After completing three rounds of oil and gas recovery treatment at gas stations in the province, Shenzhen has reduced the annual emission of volatile organic compounds by about 320 tons, fully reflecting the environmental benefits of this equipment. Experts point out that carrying out three rounds of oil and gas recovery has the effect of achieving "three benefits at once" - reducing VOCs emissions in terms of environmental benefits, reducing storage tank pressure and eliminating safety hazards in terms of safety benefits, and recovering oil products to reduce losses in terms of economic benefits.

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