加油站油气回收系统验收和日常监管，绕不开三个指标：系统密闭性、加油枪气液比、排放口浓度。它们分别对应油气跑到哪去、能不能收回来、收得干不干净。把这三个参数管住，系统的运行水平就基本可控。本文逐一说明它们的含义和日常管理方法。

The acceptance and daily supervision of the gas recovery system at gas stations cannot be separated from three indicators: system tightness, gas-liquid ratio of the refueling gun, and concentration at the discharge port. They correspond to where the oil and gas are going, whether they can be retrieved, and whether they can be fully recovered. By controlling these three parameters, the operational level of the system can be basically controlled. This article explains their meanings and daily management methods one by one.

密闭性：油气不泄露是回收的前提

Sealing: Non leakage of oil and gas is a prerequisite for recovery

一次、二次油气回收系统靠管道和油罐形成密闭回路，密闭性不好，油气从泄漏点跑掉，回收率无从谈起。密闭性检测通常是对系统加压或抽真空，观察压力保持情况，超过允许压降即判定不合格。日常管理中，管线接口、人孔、量油孔、呼吸阀法兰都是易泄漏点，巡检时重点看有无油气味、油渍和锈蚀，发现异常及时排查修复。

The primary and secondary oil and gas recovery systems rely on pipelines and oil tanks to form a closed loop, which is not well sealed. Oil and gas can escape from the leakage point, and the recovery rate cannot be discussed. Tightness testing usually involves applying pressure or vacuuming to the system, observing the pressure holding situation, and determining that it is unqualified if it exceeds the allowable pressure drop. In daily management, pipeline interfaces, manholes, oil measuring holes, and breathing valve flanges are all prone to leakage points. During inspections, focus on checking for oil odors, oil stains, and rust, and promptly investigate and repair any abnormalities found.

气液比：每加一升油收回应有的油气

Gas liquid ratio: for every liter of oil added, recover the appropriate amount of oil and gas

气液比衡量加油过程中回收的油气量与加油量的比例，是二次油气回收的核心指标。气液比过高会把空气抽进油罐，增加三次回收装置的负荷；过低则油气回收不充分，油气从油箱口逸散。日常要用气液比检测仪按规范频次抽检，发现偏离及时调整真空泵或比例阀，保证回收效果和加油体验的平衡。

The gas-liquid ratio measures the ratio of the amount of oil and gas recovered during refueling to the amount of fuel added, and is the core indicator of secondary oil and gas recovery. A high gas-liquid ratio will draw air into the oil tank, increasing the load on the tertiary recovery device; If it is too low, the oil and gas recovery will be insufficient, and the oil and gas will escape from the fuel tank port. In daily life, a gas-liquid ratio detector should be used to randomly check according to the standard frequency. If any deviation is found, the vacuum pump or proportional valve should be adjusted in a timely manner to ensure a balance between the recovery effect and the refueling experience.

排放浓度：三次回收装置的最终答卷

Emission concentration: Final answer sheet of three recycling devices

三次油气回收装置的任务是把油罐区排出的高浓度油气处理到低浓度排放，排放口浓度是衡量其性能的硬指标。装置运行中要持续监测排放浓度，膜分离加压缩冷凝的组合工艺设计上能把排放浓度控制在很低的水平，但前提是装置工况正常：进气浓度、处理量在额定范围内，膜组件和冷凝机组状态良好。排放浓度出现趋势性上升，通常意味着膜组件老化、冷凝效率下降或预处理失效，应尽快排查。

The task of the tertiary oil and gas recovery device is to process the high concentration oil and gas discharged from the oil tank area into low concentration discharge, and the discharge outlet concentration is a hard indicator to measure its performance. Continuous monitoring of emission concentration is required during the operation of the device. The combination process design of membrane separation and compression condensation can control the emission concentration at a very low level, provided that the device operates normally: the inlet concentration and processing capacity are within the rated range, and the membrane components and condensing units are in good condition. The trend of increasing emission concentration usually indicates aging of membrane components, decreased condensation efficiency, or failure of pretreatment, and should be investigated as soon as possible.

把三个指标串起来管理

Link the three indicators together for management

密闭性是基础，气液比管回收过程，排放浓度管最终结果，三者相互影响：密闭性差会拉低回收率，气液比失衡会推高三次回收负荷，进而影响排放浓度。建议加油站建立台账，把密闭性检测、气液比抽检、排放浓度记录放到一起看，数据联动分析，比单看任何一个指标都更能发现系统性问题。

Sealing is the foundation, the gas-liquid ratio tube recovery process, and the final result of the discharge concentration tube all affect each other: poor sealing will lower the recovery rate, and gas-liquid ratio imbalance will push up the tertiary recovery load, thereby affecting the discharge concentration. It is recommended that gas stations establish a ledger to combine airtightness testing, gas-liquid ratio sampling, and emission concentration records for data linkage analysis, which can better identify systemic issues than simply looking at any one indicator.

达标运行不是验收那一刻的事，而是每一次加油、每一轮巡检、每一组数据的累积结果。

Standard operation is not a matter of acceptance at the moment, but the cumulative result of every refueling, every round of inspection, and every set of data.

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