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.
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.
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.
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.
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.
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.
Mr. Li 13526990215
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