A self-compensating radial sealing system for air preheater rotor deformation

Abstract

The invention provides a rotor deformation self-compensation type radial sealing system for an air preheater. The rotor deformation self-compensation type radial sealing system for the air preheater comprises a rotor, a sealing board, a rotor radial sealing mechanism arranged between the rotor and the sealing board, and a linear differential expansion type drive device, wherein the linear differential expansion type drive device generates driving force through temperature, and maintains that the absolute position of the rotor radial sealing mechanism keeps unchanged along with changes of a temperature field so as to compensate for a radial air leakage interval of the air preheater. When the rotor droops and deforms in a thermal state, the linear differential expansion type drive device relatively shifts due to the linear differential expansion, then the distance between a sealing piece installation frame and the rotor is changed, it is maintained that a rotor radial sealing piece does not ascend along with rotor deformation, and the absolute position of the rotor radial sealing piece keeps unchanged. The rotor deformation self-compensation type radial sealing system for the air preheater is simple in structure, capable of greatly reducing the air leakage rate, free of manual intervention, high in response speed, low in cost, convenient to adjust, low in maintenance cost and long in service life.

Description

technical field [0001] The invention relates to the technical field of a rotary air preheater, in particular to a radial sealing system of a rotor deformation self-compensating type of a rotary air preheater. Background technique [0002] The air preheater, referred to as the air preheater, is an essential equipment for large-scale thermal power boiler systems. It heats the air entering the furnace by absorbing the heat of the flue gas to achieve the purpose of energy saving and environmental protection. By improving the heat transfer efficiency of the air preheater, it can effectively improve One of the important tasks to improve the efficiency of the air preheater is to reduce the air leakage rate. Reliable calculations show that every 1% increase in the air leakage rate of the air preheater will increase the coal consumption of power supply by 0.06-0.08g / kwh. . While wasting a lot of energy, it also causes wear and tear inside the air preheater and shortens the life of ...

AI Technical Summary

Problems solved by technology

The automatic air leakage control system has improved the air leakage of the air preheater to a certain extent, but it has also brought about operation and maintenance problems such as thermal jamming of the system, frequent sensor damage, ash leakage from the lifting rod, and failure of the electronic control device, etc., resulting in the overall failure of the equipment. Operation ratio is not high

However, the spring flexible seal has a complex structure, short life, high replacement cost and poor economy. It is difficult to make up for the investment in equipment by reducing the economic benefits brought by air leakage.

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