Cause analysis of cylinder volume liquid: The ammonia cooling system of the continuous reforming unit is not used. When the hydrogen gas passes through the contact system, the temperature does not fall, and the heavy components in the hydrogen cannot be precipitated and condense into a liquid. The hydrogen is transported from continuous reforming to diesel hydrogenation for a long distance, and the pipeline has no heat preservation, which is equivalent to an equal pressure cooling process, and heavy components such as C in the medium condense into a liquid. The new hydrogen of the compressor has a low outlet temperature, and the medium condenses into a liquid after being compressed due to the low temperature. The oil volume of the cylinder block lubricating oil is too large, causing the lubricating oil to accumulate. Solution: Under the coordination of the refinery plant, the continuous reforming unit uses an ammonia cooling system to make the heavy components in the hydrogen as much as possible to be absorbed by the reforming reaction when passing through the re-contact system, so that the recombination in the hydrogen The fractional content dropped from the original 8 to about 5. The frequency of de-liquidening of the new hydrogen inlet liquid separation tank was increased in the device (from 1 time / 8h to 1 time / 4h). Take measures to reduce the amount of cooling water in the cylinder of the compressor and increase the temperature of the outlet, so as to be as close as possible to the upper limit of the design, to avoid increasing the amount of liquid generated by the medium during the compression process due to low temperature. Reduce the amount of lubricant injected into the cylinder and piston, packing and tie rods, from 8 drops per minute to 4 drops per minute. Due to the above measures, the continuous operation time of the hydrogen combined compressor has been extended from the original half a month to more than one year. Since July 2001, the operation has been good, which has ensured the normal production of the device and reduced the downtime. Moreover, inspection and maintenance costs have dropped by 200,000 yuan per year. In the case where the heavy component content in the fresh hydrogen gas is too high, the oil volume of the cylinder block lubricating oil is too large, and the liquid removal is not timely, the compressor valve piece is subjected to excessive impact force and fatigue fracture occurs. Attention must be paid to the working environment of the compressor and the process conditions of the gas valve so that the compressed medium meets the process requirements to ensure long-term operation of the unit and the unit.