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Thermal compensation sealing device applied to hot end of air pre-heater and mounting structure of thermal compensation sealing device

A technology of sealing device and installation structure, applied in the directions of engine sealing, lighting and heating equipment, combustion methods, etc., can solve the problem of large air leakage in the radial triangle air leakage area of ​​the hot end, and achieve the elimination of the triangle air leakage area and high reliability. , the effect of poor deformation stability

Pending Publication Date: 2020-05-29
四川辉胜至成电力工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 solved, and with the development of the unit toward large capacity, the diameter of the air preheater rotor continues to increase Large, if no measures are taken, the air leakage share in the radial triangular air leakage area at the hot end will become larger and larger

Method used

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  • Thermal compensation sealing device applied to hot end of air pre-heater and mounting structure of thermal compensation sealing device
  • Thermal compensation sealing device applied to hot end of air pre-heater and mounting structure of thermal compensation sealing device
  • Thermal compensation sealing device applied to hot end of air pre-heater and mounting structure of thermal compensation sealing device

Examples

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Embodiment 1

[0043] Such as Figure 2-3 As shown, a heat compensation sealing device applied to the hot end of the air preheater, including a first sealing sheet and a second sealing sheet; as Figure 4-5 As shown, the first sealing sheet and the second sealing sheet are long strips; the first sealing sheet is provided with more than two first expansion gaps along the length direction, and the length direction of the first expansion gap is the same as the length of the first sealing sheet The direction is vertical, the second sealing sheet is provided with more than two second expansion gaps along the length direction, the length direction of the second expansion gap is perpendicular to the length direction of the second sealing sheet; the first sealing sheet and the second sealing sheet are attached to each other Together, and the length direction of the first sealing sheet and the second sealing sheet are consistent, the first expansion gap and the second expansion gap are distributed in...

Embodiment 2

[0045] On the basis of Example 1, the following improvements are further made: In order to facilitate installation and facilitate the sealing device to form a cantilever beam structure along the radial direction of the air preheater rotor, the first sealing sheet and the second sealing sheet are provided with two holes along the length direction. More than two waist-shaped holes, the number of waist-shaped holes on the first sealing sheet is equal to the number of waist-shaped holes on the second sealing sheet, and the positions are the same, and the length direction of the waist-shaped holes on the first sealing sheet is consistent with the width direction of the first sealing sheet. The length direction of the waist-shaped hole on the second sealing sheet is consistent with the width direction of the second sealing sheet.

Embodiment 3

[0047] On the basis of Example 2, the following improvements were further made: In order to further improve the deformation stability and deformation capacity of the sealing device, and simultaneously enhance the repeatability of cold and heat alternation, as Figure 4 As shown, the upper and lower ends of the waist-shaped hole in the length direction of the first sealing sheet are provided with first expansion slits penetrating with the waist-shaped hole. In order to take into account the requirements of strength and stability, the length of the first expansion gap at the upper end of the waist hole is 2 / 3 of the distance from the upper end of the waist hole to the free end of the first sealing sheet, and the first expansion gap at the lower end of the waist hole is The edge of the fixed end of the first sealing sheet passes through. Such as Figure 5 As shown, the fixed end between two adjacent waist-shaped holes on the second sealing sheet is provided with a second expansi...

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Abstract

The invention discloses a thermal compensation sealing device applied to a hot end of an air pre-heater and a mounting structure of the thermal compensation sealing device. The thermal compensation sealing device comprises a first sealing plate and a second sealing plate, wherein both the first sealing plate and the second sealing plate are in the shapes of long strips; two or more first expansionseams are formed in a length direction in the first sealing plate, and two or more second expansion seams are formed in a length direction in the second sealing plate; the first sealing plate and thesecond sealing plate are mutually fitted together, the length direction of the first sealing plate is consistent with that of the second sealing plate, and the first expansion beams and the second expansion beams are distributed in a staggered mode; the fixed end of the first sealing plate and the fixed end of the second sealing plate are fixedly connected by spot welding; and a thermal expansioncoefficient of the first sealing plate is different from that of the second sealing plate. The thermal compensation sealing device can eliminate a conventional triangular air leakage area of the airpre-heater, remarkably reduces an air leakage rate of the air pre-heater, increases deformation amount while a sealing device is heated, and strengthens elastic deformation, cold-heat alternating repeatability, and deformation stability.

Description

technical field [0001] The invention relates to a thermal compensation sealing device applied to the hot end of an air preheater and its installation structure, 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 difference in temperature between 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. With the deformation of the rotor diaphragm, the air leakage gap also changes. Based on the "mushroom-shaped" deformation mechanism of the rotor, appropriate cold clearances are reserved in the axial ...

Claims

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Application Information

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IPC IPC(8): F16J15/16F16J15/3284F23L15/02
CPCF16J15/164F16J15/3284F23L15/02Y02E20/34
Inventor 王徐珩菁
Owner 四川辉胜至成电力工程有限公司