Low-pressure cylinder dry gas sealing device of synthesis gas compressor

The utility model relates to the field of synthesis gas compressors, in particular to a low-pressure cylinder dry gas sealing device of a synthesis gas compressor. The low-pressure cylinder dry gas sealing device comprises a high-pressure cylinder gas inlet pipe and a low-pressure cylinder gas inlet pipe. The high-pressure cylinder gas inlet pipe is connected with one end of a high-pressure cylinder. The other end of the high-pressure cylinder is connected with a high-pressure cylinder exhaust pipe. The low-pressure cylinder gas inlet pipe is connected with one end of a low-pressure cylinder. The other end of the low-pressure cylinder is connected with a low-pressure cylinder exhaust pipe. The first sealing cavity of the low-pressure cylinder is connected with the low-pressure cylinder exhaust pipe through a gas guide pipe. The low-pressure cylinder gas inlet pipe is connected with the high-pressure cylinder gas inlet pipe through a blowdown pipe. A first switch valve is disposed on the low-pressure cylinder gas inlet pipe. The connection of the blowdown pipe and the low-pressure cylinder gas inlet pipe is located between the first switch valve and the low-pressure cylinder. The low-pressure cylinder dry gas sealing device has the advantages that the device is simple in structure, process gas used by the high-pressure cylinder in the synthesis gas compressor is guided to the first sealing cavity of the compressor low-pressure cylinder to perform dry gas sealing, and the problems that when high-pressure nitrogen is guided into the device, the process gas in the low-pressure cylinder is polluted, and the exhaust temperature of the compressor exceeds the standards are solved.