Dry gas seal system for centrifugal compressors
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Please, experts, let us know the functions and sources of each type of gas source. Thank you
The sealing gas is your process gas, while the buffer gas/isolation gas is provided by the dry gas system, usually nitrogen. The buffer gas carries the process gas to the flare for combustion, and the isolation gas is introduced into the process gas flowing into the compressor. Near the bearing housing, it is also necessary to prevent bearing oil from leaking.
This system consists of pre-air, isolation air, and sealing air. Photos cannot be uploaded
Schematic diagram of the dry gas seal system for centrifugal compressors
For centrifugal compressors, I have worked with three-stage seals: a low-pressure seal for isolating air, a high-pressure seal for isolating air, and a hot-high-pressure seal for isolating air. These gases are all nitrogen at various pressure levels. Low-pressure seal gas is used to prevent the compressor lubricant from seeping into the compressor side. High-pressure sealing gas prevents the high-pressure material inside the compressor from leaking out.
This post was last edited by foam_ZPTK on 2017-12-30 07:56. Your system should use a double-end dry gas seal; the main function of the pre-sealing gas is to provide a clean working environment for the dry gas seal. Generally, the pre-sealing gas is taken from the outlet gas of the unit itself, enters the dry gas seal system first, and is then injected into the sealing chamber after being filtered. Through internal comb-tooth throttling within the unit, a continuous flow is maintained into the unit, thereby preventing dirty gases from inside the unit from entering the sealed chamber and contaminating the dry gas seal.
Yes, it is indeed a double-end face seal. There is a pressure difference between the pre-air and the balance tube. The balance tube is connected to the process gas. Sir, is the sealing gas part of the sealed dry gas system, and is the isolation gas used to prevent oil from entering the dry gas system? Thank you
Yes, it is indeed a double-end face seal. There is a pressure difference between the pre-air and the balance tube. The balance tube is connected to the process gas. Sir, is the sealing gas part of the sealed dry gas system, and is the isolation gas used to prevent oil from entering the dry gas system? Thank you
Sir, by the way, I have a question about the pressure difference. How is the pressure difference determined? Is the process gas at a higher pressure than the external gas?