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Assembly used for mounting radial sealing pad of air preheater

A radial sealing and air preheater technology, applied in heat exchanger sealing device, combustion method, indirect carbon dioxide emission reduction, etc., can solve the problem of increasing air leakage rate, affecting boiler operation efficiency, and increasing secondary air side smoke Air leakage and other issues on the air side to achieve the effect of optimizing the sealing performance

Active Publication Date: 2016-10-26
四川东能节能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the air preheater in a thermal power plant is running, the rotor operates at a high temperature of about 360 degrees Celsius for a long time. After the rotor deforms like a mushroom, there will be a gap between it and the fan-shaped plate, which will increase the side smoke of the primary and secondary air. The amount of air leakage on the gas side increases the air leakage rate and affects the operating efficiency of the boiler

Method used

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  • Assembly used for mounting radial sealing pad of air preheater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 As shown, an assembly for installing the radial sealing plate of an air preheater includes a bimetal 4 and two rotating shafts 3 parallel to each other. The bimetal 4 is two pieces, and the two bimetal 4 The two ends of each are fixed with connection blocks 2, and the connection blocks 2 at both ends of one bimetal sheet 4 are hingedly connected to the corresponding connection block 2 on the other bimetal sheet 4 through different rotating shafts 3, and the connected two bimetal sheets The sheets 4 are in a layered relationship with each other;

[0027] When the two bimetallic strips 4 are heated, the deformation directions are opposite, and when the temperature of any bimetallic strip 4 rises, the middle part of the bimetallic strip 4 protrudes toward the side away from the other bimetallic strip 4;

[0028] When the two bimetallic strips 4 are heated and deformed, the end of at least one bimetallic strip 4 can rotate around the corresponding rotating sh...

Embodiment 2

[0032] The present embodiment is further limited on the basis of embodiment 1, as figure 1 As shown, in order to facilitate the application of this component to the air preheater, the middle parts of the two bimetallic sheets 4 are provided with the first connecting bolts 5, and one of the bimetallic sheets 4 is connected to the support through the first connecting bolts 5 on it. Plate 1, another piece of bimetal 4 is connected with pallet 6 through the first connecting bolt 5 on it. The above support plate 1 is used for the installation of this component on the air preheater, and the above tray 6 is used for installing the sealing sheet.

[0033] Since the ambient temperature of the assembly changes greatly, in order to improve the anti-loosening performance between the components in the assembly, each first connecting bolt 5 is provided with a spring washer.

[0034] When the ambient temperature of the assembly changes, the distance between the connecting block 2 on each bi...

Embodiment 3

[0038] This embodiment is further limited on the basis of any one of the technical solutions provided by any one of the above embodiments, and the two bimetallic sheets are wrapped with a heat-resistant layer. The heat-resistant layer is used to delay the temperature change of the bimetal: because the deformation of the rotor is relatively slow, by setting the heat-resistant layer, the thermal resistance of the heat-resistant layer can prolong the time of the temperature change process of the bimetal to avoid the deformation of the rotor. When it is small, such as during a period of time when the air preheater is just started, the large deformation of the bimetal will cause excessive force between the sealing plate and the sector plate, thus causing damage to the sealing plate or the bimetal.

[0039] In this embodiment, the above heat-resisting layer adopts heat-retaining glass fiber or nano heat-insulating material.

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Abstract

The invention discloses an assembly used for mounting a radial sealing pad of an air preheater. The assembly comprises two bimetal sheets and further comprises two rotating shafts parallel with each other, the two ends of the two bimetal sheets are all fixedly provided with connecting blocks, the connecting blocks at the two ends of one of the bimetal sheets are separately connected with corresponding connecting blocks on the other bimetal sheet through different rotating shafts in a hinging manner, and the two connected bimetal sheets are of a stacked relationship; when the two bimetal sheets are heated, the deformation directions are opposite; and when the two bimetal sheets deform after being heated, the end parts of at least one bimetal sheet can rotate around the corresponding rotating shafts. As the final staying position of the sealing pad connected to the assembly is more accurate, the controlled precision of the sealing pad position is higher, the sealing pad performs a great seal performance, and at the same time, the controllable performance of stress between the sealing pad and a fan-shaped plate is great. Therefore, the service life of the sealing pad adopting the assembly can reach more than three years without being maintained.

Description

technical field [0001] The invention relates to the field of sealing components of an air preheater, in particular to an assembly used for installing radial sealing sheets of an air preheater. Background technique [0002] Rotary air preheater, referred to as air preheater, is a heat exchange device for large boilers. Compared with tubular air preheaters, it has the advantages of compact structure, small volume, high heat exchange surface density, light weight of the whole machine, and low metal consumption. It is widely used in power plant boilers due to the characteristics of small quantity, convenient layout and installation, and light corrosion at low temperature. 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. T...

Claims

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Application Information

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IPC IPC(8): F23L15/00F28F11/02
CPCF23L15/00F28F11/02Y02E20/34
Inventor 蒋宁唐亦军冯敏
Owner 四川东能节能技术有限公司
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