Novel non-deformation constant-air-leakage-rate sealing device for air pre-heater

Abstract

The invention discloses a novel non-deformation constant-air-leakage-rate sealing device of an air pre-heater. The flexible sealing device comprises a floating plate, a limiting mechanism and a flexible sealing mechanism, the flexible sealing mechanism is installed at the upper end of the floating plate through a connecting piece, the limiting mechanism is arranged between the floating plate and a bin grid plate and comprises a limiting plate and a limiting supporting hook, and the limiting supporting hook is arranged on the rear side of the limiting plate in the rotating direction; a limiting groove is formed between the limiting supporting hook and the sealing side of the limiting plate, the floating plate is placed in the limiting groove, and the front end face of the limiting plate is attached to the rear end face of a fixed reinforcing plate fixed to the center cylinder. The non-deformation constant air leakage rate device has the beneficial effects that compared with an existing non-deformation constant air leakage rate device, the structure is simple, installation is firm and reliable, and the problem that the existing non-deformation constant air leakage rate device is complex in assembly and disassembly procedures due to various structural parts is solved; and potential safety hazards caused by the fact that a limiting device is limited in welding position, poor in welding effect and prone to falling off after being collided, abraded and impacted by the sector plate are avoided, and disassembly, assembly and maintenance are convenient.

Description

technical field [0001] The invention relates to the technical field of sealing the hot end of an air preheater, and more particularly relates to a novel non-deformable and constant air leakage rate sealing device for an air preheater. Background technique [0002] The air preheater is a device that uses the heat of the flue gas discharged from the boiler to preheat the air required to enter the boiler for combustion, or as a recovery device for the heat of the boiler flue gas, so that the above heat can be used as fuel for dehumidification, heating and other purposes. The purpose of this equipment setup is to increase the efficiency of the boiler. [0003] The existing air preheater can be divided into tube box type and rotary type. The rotary air preheater is widely used in power plant boilers because of its large heat exchange area per unit volume and compact layout. However, the rotary air preheater The mushroom-like deformation of the rotor in the hot state will cause t...

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Problems solved by technology

It can be seen that the existing non-deformation and constant air leakage rate sealing device has many parts, complex structure, cumbersome installation, high precision requirements, and due to design problems, the structural welding position behind the limit device along the direction of rotation is limited, and the welding strength is insufficient. In the long-term start-stop process, the floating plate and the fan-shaped plate may be detached due to friction and impact, and the swing limit of the floating plate will be lost, which will cause potential safety hazards in operation, and the five limit devices corresponding to each floating plate are installed independently. Yes, it is difficult to adjust the coaxiality, and it is easy to be offset and displaced due to friction during use, resulting in jamming or even locking of the floating plate during operation, unable to achieve floating sealing, and the air leakage rate of the air preheater is greatly increased , when most of the floating plates lose the function of floating seal, the whole device will lose the function of constant sealing without deformation, and the air leakage rate is even higher than before the modification, which seriously affects the safety and economy of the whole boiler operation, and the maintenance cost is high. High difficulty

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