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Why does the compressor need nitrogen sealing? How much nitrogen is generally required for nitrogen sealing? Take a 1920 m/h unit as an example.
Nitrogen sealing can prevent process gas from leaking from the cylinder to the crankcase and other compartments, and is a safety measure. However, the specific dosage and pressure should be calculated based on working pressure and other data.
The nitrogen seal in the crankcase of the reciprocating compressor is mainly to prevent the explosion caused by the intrusion of process gas.； In addition, it can also play a certain role in protecting lubricating oil.
Most of the shaft end seals of centrifugal compressors now use dry gas seals, and clean gas needs to be supplied between the dynamic and stationary rings of the dry gas seal to generate a gas film to seal the medium. On the one hand, it prevents process gas from leaking out, and on the other hand, it prevents lubricating oil from entering. Nitrogen is the best isolation gas. The pressure depends on the process gas outlet pressure. The flow rate is not very large. The dry gas seal manufacturer can provide data based on the parameters.
Nitrogen sealing mainly prevents process gas leakage, and can also prevent lubricating oil from entering the cylinder.
Taken together: Both reciprocating compressors and centrifugal compressors use nitrogen seals. They are mainly used for flammable, explosive or toxic process gases to take the leaked gas to the exhaust gas treatment device. ； In addition, it can also play a certain role in protecting lubricating oil. If the shaft end seal of the centrifugal compressor adopts nitrogen seal, it must use dry gas seal. In addition to the above operations, the nitrogen seal also needs to provide a certain pressure, and the pressure must be higher than the pressure of the transported gas. .
If nitrogen is used in a dry gas seal, is the gas flowing or fixed?
And then it goes into the torch line together with the process gas?
Mainly to prevent flammable and explosive gases from entering, for safety reasons
Our compressor nitrogen sealing pressure is: The packing nitrogen seal is 0.25MPa and the isolation chamber nitrogen seal pressure is 0.05MPa. The main function of the nitrogen seal is to prevent hydrogen leakage from causing an explosion, so a slightly positive pressure nitrogen protection is added to blow the leaked hydrogen into the flare system.