A fixed self-compensating sealing sheet for air preheater and its sealing system

Abstract

The invention discloses an air preheater stationary self-compensation sealing fin and a sealing system comprising the air preheater stationary self-compensation sealing fin. The air preheater stationary self-compensation sealing fin comprises a sealing fin body and a first driving fin. The sealing fin body is in a long strip shape. The first driving fin is arranged in the length direction of the sealing fin body. The first driving fin clings to and is fixedly connected with the sealing fin body. The fixed connection area of the first driving fin and the sealing fin body is called as a driving belt. In the width direction, one end of the sealing fin body goes beyond the first driving fin to form a free end, the driving belt is located on the half side, away from the free end, of the sealing fin body in the width direction, the thermal expansion coefficient of the first driving fin is larger than that of the sealing fin body, and the air preheater stationary self-compensation sealing fin is provided with an installation hole. From a cold state to a thermal state of an air preheater, a rotor deforms in a mushroom shape; while, after the sealing fin is installed in place, deformation along with a rotor partition plate is avoided almost. Compared with other sealing technologies, the air preheater stationary self-compensation sealing fin has the comprehensive advantages of being low in cost, high in reliability and good in sealing performance.

Description

technical field [0001] The invention relates to a fixed self-compensating sealing sheet of an air preheater and a sealing system containing it, belonging to the field of air preheater sealing. Background technique [0002] Rotary air preheater is a kind of heat exchange equipment used in large coal-fired power plant boilers. It uses the heat of boiler flue gas to heat the air required for combustion, so as to improve the efficiency of the boiler. The rotor of the air preheater changes from the cold state to the hot state. Due to the different temperature of the upper and lower ends and the weakening of the rigidity of the steel after heating, a "mushroom" deformation occurs. The traditional rigid sealing sheet is fixed on the rotor diaphragm by bolts in sections. As the rotor diaphragm deforms, the air leakage clearance also changes. Based on the "mushroom-shaped" deformation mechanism of the rotor, appropriate cold clearances are reserved in the axial and radial positions ...

AI Technical Summary

Problems solved by technology

[0005] In short, the air leakage problem in the radial triangular air leakage area at the hot end has not been completely resolved, and with the development of the unit to a larger capacity, the diameter of the air preheater rotor continues to increase. If no measures are taken, the radial triangular air leakage area at the hot end will Air leakage share is increasing

Images