A high temperature resistant supercritical carbon dioxide turbine dry gas sealing device

Abstract

The invention provides a high temperature resistant supercritical carbon dioxide turbine dry gas sealing device, comprising a sealing dynamic ring, a sealing static ring and a spring seat, the sealing dynamic ring and the sealing static ring form a dry gas sealing body, and the sealing dynamic ring and the sealing static ring The gap can form a rigid air film; the sealing static ring and the spring seat are sealed by the first C-shaped sealing ring, the spring seat and the turbine cylinder are connected by the spring and sealed by the second C-shaped sealing ring, the first C-shaped sealing ring The surface of the sealing ring and the second C-shaped sealing ring is coated with a high temperature resistant coating and the interior is made of metal material. The invention adopts the metal C-shaped sealing ring with a high temperature resistant coating on the surface to replace the PTFE sealing ring with poor high temperature resistance in the traditional dry gas seal, and the metal C-shaped sealing ring has strong pressure bearing capacity, good high temperature resistance and elasticity , The high temperature resistant coating has the characteristics of good lubricity and good sliding follow performance, realizing the micro vibration compensation of the dry gas seal under the high speed of the turbine rotor, and realizing the end seal of the supercritical carbon dioxide turbine.

Description

technical field [0001] The invention relates to the technical field of advanced turbine equipment, and more specifically relates to a high-temperature-resistant supercritical carbon dioxide turbine dry gas sealing device. Background technique [0002] The supercritical carbon dioxide power generation system is a Brayton cycle system using supercritical carbon dioxide as the working medium. The cycle process is as follows: first, the supercritical carbon dioxide is boosted by the compressor; Heating; secondly, the working medium enters the turbine to drive the turbine to do work, and the turbine drives the motor to generate electricity; finally, the working medium enters the cooler to return to its original state, and then enters the compressor to form a closed cycle. Among them, when the temperature of carbon dioxide reaches 31.10C and the pressure reaches 7.38MPa, it will become a supercritical state. Its special physical characteristics of low gas viscosity and high liquid...

AI Technical Summary

Problems solved by technology

Because the lubricating performance of carbon dioxide is significantly weaker than that of water, the mechanical seal method used in traditional steam turbines cannot be used in supercritical carbon dioxide turbines. The current research results at home and abroad show that dry gas seals are the preferred shaft end seals for high-power supercritical carbon dioxide turbines. Program

The existing dry gas seal is mainly aimed at the medium and low temperature environment. The sealing ring is mainly made of polytetrafluoroethylene. The polytetrafluoroethylene sealing ring is difficult to withstand the high temperature environment caused by the heat conduction of the turbine cylinder. Therefore, the existing dry gas sealing structure is difficult to meet the requirements. Due to the application requirements of supercritical carbon dioxide turbines under high temperature conditions, the development of efficient and reliable high temperature resistant turbine shaft end seal structures is the key to the development of supercritical carbon dioxide turbines

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