二次油气回收就是将汽车在加油时所挥发产生的油气给回收起来，二次回收就是采用加油枪收集然后再返回到储油罐内。这一阶段就是二次回收。二次回收系统，有集中式还有分散式的，这两种回收系统有什么特点呢：

Secondary oil and gas recovery is the process of recovering the oil and gas evaporated during refueling of a car. Secondary recovery involves using a fuel gun to collect the gas and then returning it to the storage tank. This stage is secondary recycling. What are the characteristics of centralized and decentralized secondary recycling systems

二次回收集中式系统：

Centralized system for secondary recycling:

这种回收系统，它是加油站内的所有加油枪的回气都是共用一台集中式油气回收真空泵的，这种集中式的真空泵就比较灵活真接安装在靠近罐区的区域就可以。

This recycling system uses a centralized oil and gas recovery vacuum pump for all refueling guns in the gas station. This centralized vacuum pump is more flexible and can be directly installed in the area near the tank area.

它的主要优点就是 ：

Its main advantages are:

变频调速，运行成本低、控制；配电及控制仅涉及配电室，与加油机不发生直接，施工难度小；加油机内安装简单，适合所有机型和所有加油站；远离加油场所，加油时感觉到的噪声更小；单泵zui高回气量可达：600L/min；

Variable frequency speed regulation, low operating cost and control; The distribution and control only involve the distribution room and do not directly interact with the fuel dispenser, making the construction difficult; The installation inside the fuel dispenser is simple and suitable for all models and all gas stations; Stay away from refueling areas and feel less noise when refueling; The maximum return air volume of a single pump can reach 600L/min;

但是这种也有缺点主要体现在以下：

But this also has its drawbacks, mainly reflected in the following:

泵运转时间比分散式长，对电机要求较高；一台真空泵带多把枪，一旦真空泵出现问题，可能会影响加油站的正常运营。

The running time of the pump is longer than that of the dispersed type, which requires higher requirements for the motor; A vacuum pump with multiple guns, once there is a problem with the vacuum pump, it may affect the normal operation of the gas station.

而分散式的回收真空泵，就是加油站内的每条加油枪都是采用对应的回气管路独立安装分散式的真空泵。这种分散式的也是有好坏。

The decentralized recycling vacuum pump means that each fuel gun in the gas station is independently installed with a corresponding return air pipeline. This decentralized approach also has its pros and cons.

分散式真回收真空泵优点:可以一泵一枪，也可以进行组合；单个真空泵故障，不影响其它加油枪油气回收；每台加油机可独立构成系统，便于在不同站点间更换；控制简单；

Advantages of decentralized vacuum pump for recycling: It can be pumped one gun at a time or combined; A single vacuum pump failure does not affect the recovery of oil and gas from other refueling guns; Each fuel dispenser can independently form a system, making it easy to replace between different stations; Simple control;

这种分散式的的缺点就是需要加油机内必须有足够的安装空间，改造费用昂贵。

The disadvantage of this decentralized system is that there must be sufficient installation space inside the fuel dispenser, and the renovation cost is expensive.

我们不管是采用哪种回收系统，我们都需要做好保养。加油站的员工必须要做到：每次开机以前都必须检查确认主机无异常情况。长期停用（四周以上）后，再重新开机时，在开机前应按试机步骤所述的内容进行检查。每个月应清扫一次主机内散热器和泵头上的灰尘，以免影响散热效果。每6个月应按试机步骤所述的内容做一次例行检查。每12个月对排放浓度做一次检测。主机周围应保持清洁，不要在主机附近堆放粉尘大的物品。下雪天要及时清理主机周围的积雪，以免影响通风效果。

Regardless of which recycling system we use, we need to do a good job of maintenance. Gas station employees must ensure that the main unit is checked and confirmed to have no abnormal conditions before each start-up. After long-term disuse (more than four weeks), when restarting, check according to the test steps before starting up. The dust on the radiator and pump head inside the host should be cleaned once a month to avoid affecting the heat dissipation effect. A routine inspection should be conducted every 6 months according to the steps described in the trial operation. Conduct emission concentration testing every 12 months. The area around the host should be kept clean, and items with high dust should not be piled up near the host. On snowy days, it is necessary to clean up the snow around the host in a timely manner to avoid affecting the ventilation effect.