Shaft end sealing method and device of supercritical carbon dioxide turbine through dry gas coupling labyrinth seal

Abstract

The invention discloses a shaft end sealing method and device of a supercritical carbon dioxide turbine through a dry gas coupling labyrinth seal. The method adopts a dry gas seal to achieve shaft endsealing of an air compressor and the turbine, and adopts a labyrinth seal to reduce the leakage amount of carbon dioxide when the dry gas seal fails. The shaft end sealing device comprises a dry gasseal unit and a labyrinth seal unit, wherein the dry gas seal unit can realize shaft end sealing of the air compressor and the turbine, and the labyrinth seal unit can reduce the leakage amount of carbon dioxide when the dry gas seal fails. The sealing method includes the step of coordinating control over the air inlet temperature and flow of the dry gas seal and the step of monitoring control over dry gas seal leakage after the air compressor and the turbine are started. According to the device and method, efficient shaft end sealing of the high-power high-rotating-speed supercritical carbondioxide air compressor and the turbine is achieved by using the dry gas seal, the leakage amount of the air compressor and the turbine is reduced during dry gas seal failure through the labyrinth seal, safe shutdown of the air compressor and the turbine is ensured, and the unit safety is remarkably improved.

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 a dry gas coupling labyrinth seal. 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. They are not suitable for high-po...

AI Technical Summary

Problems solved by technology

[0004] Traditional labyrinth seals and mechanical seals have problems such as large leakage and inability to achieve high-speed operation. They are not suitable for high-power and high-speed supercritical carbon dioxide compressors and turbines. The dry gas seal has a good sealing effect, but the long-term operation reliability Weaker than traditional seals

There is currently no known effective supercritical carbon dioxide compressor and turbine shaft end seal method

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