After entering winter, the operation status of the three oil and gas recovery devices at northern gas stations will show significant changes. Low temperature affects equipment performance and can easily expose hidden dangers that cannot be seen in summer. Doing winter special maintenance in advance can avoid equipment chain failure during severe cold seasons. The following points are based on the general operating rules of VOCs treatment equipment and are applicable to various combined processes of compression condensation and membrane separation for tertiary oil and gas recovery devices.
The temperature drop first affects the condensation process: when the ambient temperature is low, the heat dissipation efficiency of the air-cooled heat exchanger is higher, and the condensation effect is actually better. However, if the refrigeration system is equipped with low-temperature protection, low temperature may cause abnormal refrigeration cycle. Next is the pipeline system, where the water vapor carried in the oil and gas can easily condense and freeze at the pipeline and valves at low temperatures, blocking the return oil pipeline. Furthermore, the viscosity of the compressor lubricating oil increases at low temperatures, causing an increase in resistance and a longer start-up time when the refrigeration unit is started.
Before entering winter, the following checks should be completed: first, whether the insulation layer of the return oil pipeline is intact, and the exposed section should be promptly wrapped with insulation cotton; Secondly, whether there are drainage and coagulation measures at the low point of the pipeline to prevent water accumulation and freezing; The third is whether the compressor oil is suitable for the local winter temperature, and if necessary, replace it with low-temperature viscosity grade lubricating oil; The fourth is whether the heater in the electrical control cabinet is working properly to prevent electrical faults caused by condensation; The fifth is the status of the membrane module intake filter. In winter, the air is dry but there are many sandstorms, so the filtration effect needs to be ensured.
Pay attention to several details during winter operation: after starting the refrigeration unit, let the equipment run without load for a few minutes, and then put it into normal operation after the oil temperature rises; Pay close attention to changes in oil return volume, and a decrease in oil return may be a signal of pipeline ice blockage; If there is snow or ice on the condenser fins, clean them in a timely manner to maintain heat transfer efficiency. If the pry mounted equipment is installed outdoors, the sealing and heating measures of the box should also be checked to avoid the internal equipment being in a sub zero environment for a long time.
If there are common winter faults such as abnormal increase in exhaust pressure, poor oil return, and increased exhaust concentration, first check for ice blockage and oil problems, and then consider equipment failure. Do not blindly disassemble the equipment. The structure of the pry mounted device is compact, and it is recommended to contact the manufacturer for guidance on the disassembly and assembly of compressors and membrane components. Keeping daily records and comparing operational data from different seasons can help identify abnormal trends more quickly.
The core of winter maintenance is three things: antifreeze, insulation, and seasonal maintenance. Be prepared in advance, and the equipment can operate stably throughout the winter.
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