很多加油站经营者分不清一、二、三次油气回收的区别，三次油气回收设备作为油罐区末端处理核心装备，主要用来处理储油罐温度变化、卸油作业带来的罐内超压油气，解决储罐“大小呼吸”造成的油气外溢问题，是加油站满足环保检测、消除罐区汽油异味、实现油气资源化回收的关键设备。一次回收管控卸油环节油气回流，二次回收管控加油时油箱挥发油气，而三次回收负责处理地下储油罐内部多余油气，三者协同才能完成完整油气闭环治理，缺少三次设备，即便一二回收完好，高温天气油罐依然会向外排放油气，导致环保检测不达标。

Many gas station operators cannot distinguish between primary, secondary, and tertiary oil and gas recovery. The tertiary oil and gas recovery equipment, as the core equipment for terminal treatment in oil tank areas, is mainly used to deal with temperature changes in storage tanks and overpressure oil and gas caused by unloading operations. It solves the problem of oil and gas overflow caused by the "big and small breathing" of storage tanks and is a key equipment for gas stations to meet environmental protection testing, eliminate gasoline odors in tank areas, and achieve oil and gas resource recovery. The first recycling process controls the backflow of oil and gas during the unloading process, the second recycling process controls the volatilization of oil and gas from the fuel tank during refueling, and the third recycling process is responsible for treating excess oil and gas inside the underground storage tank. Only through the cooperation of the three can a complete closed-loop management of oil and gas be achieved. Without the third recycling equipment, even if the first and second recycling processes are intact, the oil tank will still discharge oil and gas outside during high temperature weather, resulting in environmental testing not meeting standards.

目前市面上主流三次油气回收包含吸附式、冷凝式以及冷凝加吸附复合工艺。超低温冷凝工艺通过多级制冷把油气降至低温，让汽油蒸汽直接液化变回液态汽油回收，优点是无活性炭耗材更换，危废产出少，运行稳定，适合大、中型加油站；传统活性炭吸附设备依靠炭床捕捉油气，再通过真空解析脱附处理，设备投入成本低，但需要定期更换活性炭，会产生危废，要做好危废台账管理。设备会根据油罐压力自动启停，行业常规启动压力设置为150Pa左右，罐内压力超过阈值自动开启处理，压力回落之后自动待机，减少不必要能耗消耗。

At present, the mainstream three stage oil and gas recovery processes on the market include adsorption, condensation, and a combination of condensation and adsorption. The ultra-low temperature condensation process uses multi-stage refrigeration to lower the temperature of oil and gas, allowing gasoline vapor to directly liquefy and return to liquid gasoline for recovery. The advantages are no replacement of activated carbon consumables, less hazardous waste output, stable operation, and suitable for large and medium-sized gas stations; Traditional activated carbon adsorption equipment relies on a carbon bed to capture oil and gas, and then undergoes vacuum desorption treatment. The equipment investment cost is low, but it requires regular replacement of activated carbon, which can generate hazardous waste. Therefore, it is necessary to manage the hazardous waste ledger well. The equipment will automatically start and stop according to the pressure of the oil tank. The industry standard starting pressure is set at around 150Pa. If the pressure inside the tank exceeds the threshold, it will automatically start and process. After the pressure drops, it will automatically standby to reduce unnecessary energy consumption.

在设备选型上，不能只看设备报价，要结合加油站实际工况。首先核算加油站日均销量、油罐总容积，重点考虑集中卸油、夏季高温环境下的油气峰值排放量，保障设备处理能力留有冗余。其次必须确认设备具备完整防爆资质，整机所有电气元件达到防爆等级，加油站属于易燃易爆场所，防爆合格证是硬性门槛，不可忽视。控制系统建议选择带PLC触摸屏的全自动机型，支持运行数据存储、故障报警，部分机型可对接环保在线监测平台，方便生态环境部门核查台账记录。同时还要考量现场安装空间，多数三次油气回收设备为撬装一体化，现场仅需对接油气管路与电源，大幅降低施工难度。

In equipment selection, we cannot only look at the equipment quotation, but also consider the actual working conditions of the gas station. Firstly, calculate the daily average sales volume of gas stations and the total volume of oil tanks, with a focus on centralized oil unloading and peak oil and gas emissions in high temperature environments during summer, to ensure redundancy in equipment processing capacity. Secondly, it is necessary to confirm that the equipment has complete explosion-proof qualifications, and all electrical components of the whole machine have reached the explosion-proof level. Gas stations are flammable and explosive places, and the explosion-proof certificate is a hard threshold that cannot be ignored. It is recommended to choose a fully automatic model with PLC touch screen for the control system, which supports operation data storage and fault alarm. Some models can be connected to the environmental protection online monitoring platform to facilitate the verification of ledger records by the ecological environment department. At the same time, the installation space on site should also be considered. Most of the three oil and gas recovery equipment is integrated with a lever, and only the oil and gas pipelines and power supply need to be connected on site, greatly reducing the difficulty of construction.

日常运维直接关系设备使用寿命和排放达标。日常巡检需要查看进气、回油、排气阀门处于开启状态，排污口定期打开清理积液，防止冷凝液体堆积影响设备效率；严禁设备长期断电，卸油作业期间必须保障三次回收装置处于可用状态。常见故障包含设备频繁启停、排放口出现明显汽油气味，多数来自管路泄漏、压力传感器偏移、冷凝系统制冷效率下降，要及时排查校准，不要带故障长期运行。很多加油站环保检测不合格，不是设备本身质量问题，而是忽视日常巡检维护，小故障拖成超标问题。

Daily operation and maintenance are directly related to the service life and emission standards of equipment. Daily inspections require checking that the intake, return, and exhaust valves are in the open position, and that the drain outlet is regularly opened to clean up accumulated liquid, in order to prevent the accumulation of condensed liquid from affecting equipment efficiency; Long term power outages of equipment are strictly prohibited, and during oil unloading operations, the tertiary recovery device must be ensured to be in a usable state. Common faults include frequent start stop of equipment, obvious gasoline odor at the discharge outlet, mostly caused by pipeline leaks, pressure sensor offset, and decreased refrigeration efficiency of the condensation system. It is necessary to promptly troubleshoot and calibrate, and avoid long-term operation with faults. Many gas stations fail environmental inspections, not because of the quality of the equipment itself, but because they neglect daily inspections and maintenance, resulting in minor malfunctions leading to exceeding standards.

一套合格的加油站三次油气回收设备，不仅帮助企业顺利通过环保验收，回收得到的液态汽油还可以重新利用，减少油品损耗，长期使用可以实现降本增效，是加油站环保升级改造的刚需配置。

A set of qualified gas station tertiary oil and gas recovery equipment not only helps enterprises pass environmental protection inspections smoothly, but also allows the recovered liquid gasoline to be reused, reducing oil loss. Long term use can achieve cost reduction and efficiency improvement, making it a necessary configuration for gas station environmental upgrading and transformation.

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