Dry gas seal self-cooling structure and method

Abstract

The invention provides a dry gas seal self-cooling structure and method. The dry gas seal self-cooling structure comprises a movable ring, a fixed ring, a pushing ring and a spring seat which are matched with one another, wherein the spring seat is provided with a plurality of rows of inner-cooling micro ring holes from inside to outside in a radial direction; every row of the inner-cooling microring holes comprises a plurality of rows of inner-cooling micro ring holes which are formed in a width direction of the spring seat; the multiple rows of inner-cooling micro ring holes and the multiple rows of inner-cooling micro ring holes communicate with one another inside the spring seat to define an inner-cooling micro ring hole matrix; and an inlet of the inner-cooling micro ring hole matrixcommunicates with upstream high-pressure seal isolating gas, and an outlet of the inner-cooling micro ring hole matrix communicates with downstream atmosphere to define a micro hole cooling channel which penetrates through upstream and downstream of dry gas seal. The method adopts the dry gas sealing self-cooling structure to perform dry gas seal cooling. The dry gas seal self-cooling structure completely utilizes a process and a condition in a normal working process of dry gas seal to effectively control a work temperature of a key sealing gasket of the dry gas seal, and increases a use temperature of the dry gas seal to be 600 DEG C or higher.

Description

technical field [0001] The invention relates to the technical field of sealing device structures, and more specifically, to a dry gas sealing self-cooling structure and method. 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 density make it have good fluidity, high hea...

AI Technical Summary

Problems solved by technology

However, the existing dry gas seal is limited by the temperature tolerance of the flexible plastic sealing ring used between the surfaces of its key components, and can only be used in medium and low temperature environments below 300°C, which cannot meet the high temperature conditions of supercritical carbon dioxide turbines. Application requirements

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