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Treatment method for preventing expansion and cracking of boiler

An anti-expansion and boiler technology, which is applied in the field of expansion and cracking of boilers, can solve problems such as boiler tube burst, and achieve the effects of increasing service life, reducing impact and ensuring safe operation.

Inactive Publication Date: 2019-06-11
DATANG HUAYIN ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems of the existing supercritical "W" flame boiler caused by expansion and cracking of the boiler tube, and to provide a boiler anti-expansion and cracking treatment method, which not only helps to change the frequent explosion of this type of boiler. At the same time, it can also provide experience guidance for the remediation of supercritical "W" flame boilers of the same type, and further provide reference opinions for the optimization design of boiler plants

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  • Treatment method for preventing expansion and cracking of boiler
  • Treatment method for preventing expansion and cracking of boiler
  • Treatment method for preventing expansion and cracking of boiler

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Embodiment 1

[0058] as combined Figure 1-Figure 9 , a boiler anti-expansion and cracking treatment method in this embodiment is mainly aimed at the method for technical improvement of boilers in the industry that are prone to expansion and cracks, and specifically includes a structural improvement method for the header 100 under the water wall, The structural improvement method of the front water wall at the ceiling floor, the structure improvement method of the ceiling outlet intermediate header 700, the structural improvement method of the connection between the middle partition wall and the side wall in the area of ​​the side wall lower header 830, etc. At present, the water-cooled wall lower header 100 in the supercritical "W" flame boiler in the industry is composed of a plurality of water-cooled wall diversity boxes 110. The two water-cooled wall diversity boxes 110 are welded and fixed together, but due to the low strength of the welds at the joints, it is easy to cause unilateral ...

Embodiment 2

[0064] A kind of boiler anti-expansion pulling crack treatment method of this embodiment, its structure is basically the same as embodiment 1, further, as Figure 4-Figure 5 As shown, this embodiment also includes structural improvements to the front water-cooled wall at the ceiling and bottom plate, and the specific improvement method is as follows: Step B1: Weld the membrane between two adjacent membrane water-cooled wall tubes 500 located in the boiler ceiling and bottom plate area type sealing plate 520, and weld the pre-buried filling plate 510 at the height center position between two adjacent membrane type water-cooled wall tubes 500, wherein the membrane type sealing plate 520 and the pre-buried filling plate 510 are well-known boilers in the industry The conventional structural design in the area of ​​the ceiling and floor will not be repeated here.

[0065] Step B2: Weld the flat steel 400 at the height center position outside the pre-embedded filling plate 510, the ...

Embodiment 3

[0068] A kind of boiler anti-expansion pulling crack treatment method of this embodiment, its structure is basically the same as embodiment 1, further, as Figure 6-Figure 8 As shown, this embodiment also includes structural improvements to the ceiling outlet intermediate header 700, wherein the ceiling outlet intermediate header 700 is composed of a plurality of intermediate diversity boxes, and a fixing device is used between two adjacent intermediate headers. Full welding The two intermediate headers are welded and fixed together in the form of welding, but due to the low strength of the welds at the joints, it is easy to cause unilateral weld de-soldering and other situations, and under the influence of thermal expansion, it is easy to damage the roof outlet intermediate header. The 700 is expanded and cracked, which affects the normal use of the ceiling outlet intermediate header 700. Therefore, for the structural improvement of the middle header 700 at the outlet of the ...

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Abstract

The invention discloses a treatment method for preventing expansion and cracking of a boiler, and belongs to the technical field of expansion and cracking of boilers. The treatment method includes structural improvement of a tube seat part of a water wall lower collecting box. An improvement method includes the following steps that joint of two adjacent water wall diversity collecting boxes is cut, a locating hold hoop is added on the joint, one side of the locating hold hoop is welded to the water wall diversity collecting boxes, and the other side of the locating hold hoop is only erected with the water wall diversity collecting boxed; a water wall sealing plate is formed by mutually lap-jointing and splicing a first water wall sealing plate and a second water wall sealing plate, and theouter sides of the first water wall sealing plate and the second water wall sealing plate are correspondingly welded to a light-pipe water wall pipe. According to the treatment method for preventingexpansion and cracking of the boiler, the propose is to overcome the problems of existing pipe bursting of the boiler of a supercritical W flame boiler due to expansion and cracking and the like are overcome, the treatment method for preventing expansion and cracking of the boiler is provided, a passive situation of frequency pipe bursting of the boiler with the supercritical W flame boiler is changed advantageously, and experience guiding is provided for renovation of the supercritical W flame boiler.

Description

technical field [0001] The invention relates to the technical field of boiler expansion and cracking, and more specifically relates to a treatment method for preventing expansion and cracking of boilers. Background technique [0002] Boiler tube bursts are mainly concentrated in the water wall, superheater, reheater and economizer, collectively referred to as "four tube bursts". The reasons for the occurrence of "four-pipe explosion and leakage" are: long-term overtemperature and overpressure, poor welding quality, expansion resistance of metal pipes, cracks caused by thermal stress, erosion and wear of pipe wall fly ash, excessive temperature rise or drop rate, low temperature smoke Gas corrosion, excessive local heat load, improper shutdown and maintenance, etc. [0003] The 600MW class supercritical “W” flame boiler designed and produced by Beijing B&W Company based on the related technology of American B&W Company, due to the deficiencies in theory, design and manufactu...

Claims

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Application Information

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IPC IPC(8): F23M5/08
Inventor 李炜龙和平邹红兵
Owner DATANG HUAYIN ELECTRIC POWER
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