Dear sea friends, I would like to ask: for the ammonia compressor’s dry gas seal, the required pressure difference for the first-stage seal in the low-pressure cylinder is 0.2 Mp, while it is 0.5 Mpaa for the high-pressure cylinder
Thread Content
I would like to ask fellow sailors why the pressure difference requirements for the primary seal gas and the secondary balance pipe in the dry gas seals of ammonia compressors are different between the low-pressure and high-pressure cylinders: it is required to be controlled at 0.2 Mpa for the low-pressure cylinder, while 0.5 Mpa is required for the high-pressure cylinder. Medium: gaseous ammonia. The inlet and outlet pressure levels for the low-pressure cylinder are 0.06–0.317 MpaA, while those for the high-pressure cylinder are 0.288–1.71 MpaA. Ensuring flow rate is understandable, but the pressure in the syngas compressor cylinder is much higher; for both the high-pressure and low-pressure cylinders, a control level of 0.2 Mpa is sufficient. Why?
The mechanical structure of some gas seals divides the pressure into three areas: one is the pressure inside the cylinder, and the other is the pressure of the sealing gas. In between, there is also a mixture gas pressure (either for recovery or evacuation), with the sealing gas and compressed gas leaking into the mixing chamber respectively. This not only suppresses the leakage of compressed gas but also ensures that there is no uncontrolled leakage into the atmosphere. Baidu Images has a schematic diagram in the gas seal section; I’m not sure if it corresponds to your principle of gas sealing, but it’s provided for reference.