Pendulum type sealing device used for rotary air preheater of thermal power boiler

Abstract

The invention belongs to the field of sealing of rotary air preheaters of thermal power boilers, and particularly relates to a pendulum type sealing device used for a rotary air preheater of a thermal power boiler. The pendulum type sealing device mainly solves the problems that a rotary air heater of a thermal power plant is short in sealing device service life, large in maintenance workload, high in failure rate, serious in air leakage, high in cost and high air preheater power consumption. The pendulum type sealing device mainly comprises a sector plate, a buffer guide plate, pendulum type sealing strips, a shaft, a supporting frame, an air preheater rotor and the like. According to the pendulum type sealing strips, slight close contact between the sealing strips and the sector plate can be achieved through the structural characteristics of the pendulum type sealing strips, the sealing effect is guaranteed, the friction force between the sealing strips and the sector plate is small, wear between the sector plate and the sealing strips is reduced, and power consumption of the air preheater is reduced. Meanwhile, the multiple sealing strips are installed on the same shaft in parallel, independent rotation around the shaft can be achieved, and the sealing requirement of the sector plate and the air preheater rotor under the deformation condition can be met.

Description

technical field [0001] The invention belongs to the sealing field of a rotary air preheater of a thermal power boiler, and in particular relates to a pendulum-type sealing device for a rotary air preheater of a thermal power boiler. Background technique [0002] Large-scale thermal power boilers usually use a rotary air preheater to heat the cold air. This heating method has the advantages of high heat transfer efficiency and small footprint, but it also has the problem of more air leakage. In order to reduce air leakage, a sealing device should be designed between the dynamic and static parts of the rotary air preheater, but the sealing devices currently used have problems such as severe wear, short life, high failure rate, and large air leakage, which not only increases maintenance Maintenance workload, but also reduces the boiler thermal efficiency. At the same time, the sealing device increases the frictional resistance between the dynamic and static parts of the air pr...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of the rotary air preheater, such as short service life of the sealing device, large maintenance workload, high failure rate, serious air leakage, high cost and high power consumption of the air preheater, the present invention provides a rotary air preheater with an advanced principle and a simple structure. A pendulum-type sealing device that can be used in the rotary air preheater of a thermal power boiler

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