Dry gas sealing device suitable for supercritical working medium

Abstract

The invention discloses a dry gas sealing device suitable for a supercritical working medium. Two-stage level dry gas seal is composed of a static ring-moving ring-static ring structure. The sealed supercritical working medium flows through, in the radial direction, a first-stage dry gas seal, and then flows through, in the radial direction, the flow channel between the moving ring and a cavity wall, and then flows through a second-stage dry gas seal. Divergent clearance is adopted in the first-stage dry gas seal, cooling channels are separately arranged on the two static rings, and a heat transfer enhancement structure is arranged on the cavity wall to reduce the end face temperature of a sealing ring. The sealed supercritical working medium is subjected to two-stage level dry gas seal, the leakage rate is greatly reduced, and the sealing performance is good. The dry gas sealing device suitable for the supercritical working medium has the remarkable advantages of reducing the temperature of the sealing ring, reducing the leakage rate and ensuring the sealing performance, and has broad market prospect.

Description

technical field [0001] The invention relates to a dry gas sealing device suitable for supercritical working fluid, which can be used for the sealing of rotating machinery in supercritical power cycles. Background technique [0002] The continuous increase in power demand has made the operating parameters of the generator set continue to increase, even reaching a supercritical state. The supercritical working fluid has good physical properties and thermal stability, which makes the supercritical working fluid power cycle have high efficiency. At the same time, the sealing of rotating mechanical equipment of supercritical generator sets has also become a research focus. [0003] As a non-contact seal, the dry gas seal has outstanding advantages such as low power consumption, low leakage, less wear, and long life. It is widely used in rotating mechanical equipment of large-scale units. Periodically distributed micron-scale shallow grooves are processed on the static or dynami...

AI Technical Summary

Problems solved by technology

[0004] Nevertheless, the supercritical working fluid parameters are relatively high, which brings great challenges to the sealing performance

In addition, the high temperature of the supercritical working fluid increases the temperature of the sealing ring of the dry gas seal, which leads to thermal deformation and increases the risk of seal failure

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