Supercritical carbon dioxide turbine shaft end sealing method and device adopting dual dry gas sealing
A technology of dry gas sealing and carbon dioxide, which is applied in the direction of steam engine devices, leakage prevention, engine components, etc., can solve the problems of large leakage of dry gas sealing, large leakage, high efficiency and reliability of turbine shaft end, etc., to solve the problem of large leakage , improve reliability, and speed up the effect of development
Pending Publication Date: 2020-08-25
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology
[0004] Traditional labyrinth seals and mechanical seals have problems such as large leakage and inability to achieve high-speed operation, so they are not suitable for high-power and high-speed supercritical carbon dioxide compressors and turbines
The reliability of the dry gas seal is relatively low, and the leakage of the dry gas seal is still relatively large due to the large shaft diameter of the high-power compressor and turbine
Efficient and reliable sealing technology for supercritical carbon dioxide compressor and turbine shaft end has not yet been disclosed
Method used
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[0019] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.
[0020] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.
[0021] Based on the problems in the prior art, the present invention proposes a supercritical carbon dioxide turbine shaft end sealing method based on double dry gas seals, using two dry gas seals to seal the shaft ends of the compressor and the turbine. That is, the present invention uses the first dry gas seal as the main seal, and uses the second dry gas seal as the backup seal when the first dry gas seal fails.
[0022] The double dry gas seal supercritical carbon dioxide turbine shaft end sealin...
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The invention discloses a supercritical carbon dioxide turbine shaft end sealing method and device adopting dual dry gas sealing. The device comprises two dry gas sealing units, wherein the first drygas sealing unit is arranged close to the high-pressure side, and can realize shaft end sealing of a gas compressor and a turbine; the second dry gas sealing unit is arranged close to the low-pressureside, and can realize shaft end supplementary sealing of the gas compressor and the turbine while the first dry gas sealing unit is invalid. The method adopts dual dry gas sealing, second dry gas sealing is taken as standby sealing after the first dry gas sealing is invalid, so that dry gas sealing reliability is improved. Dry gas sealing reliability is improved through dual dry gas sealing, so that unit safety is remarkably improved; a carbon dioxide air-exhausting supercharging unit is arranged between two stages of dry gas seals, so that overall leakage amount of dry gas sealing can be obviously reduced, and therefore, the problem that dry gas sealing leakage amount of a large-power supercritical carbon dioxide turbine shaft and a turbine shaft end is great is solved.
Description
technical field [0001] The invention relates to the technical field of advanced turbine equipment, more specifically, to a method and device for sealing the shaft end of a supercritical carbon dioxide turbine with double dry gas seals. Background technique [0002] The supercritical carbon dioxide power conversion system is an innovative concept of power conversion technology, and the compressor and turbine are the core equipment of the system. [0003] Compressors and turbines are high-speed turbine equipment. Compared with traditional air working fluid, supercritical carbon dioxide compressors and turbines need to solve the sealing problem of supercritical carbon dioxide under high speed and high pressure. The quality of the sealing effect directly affects the system. safety and economy. [0004] Traditional labyrinth seals and mechanical seals have problems such as large leakage and inability to achieve high-speed operation, and are not suitable for high-power and high-s...
Claims
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IPC IPC(8): F01D11/06F01K7/32F01K25/10
CPCF01D11/06F01K7/32F01K25/103
Inventor 刘光旭黄彦平王俊峰
Owner NUCLEAR POWER INSTITUTE OF CHINA