Membrane type water cooling wall structure of boiler

Abstract

The utility model belongs to the technical field of boiler roof tubes, and particularly discloses a boiler membrane type water cooling wall structure which comprises a first membrane type wall, a second membrane type wall, a third membrane type wall and a water cooling unit, the water cooling unit is formed by welding the first membrane type wall, the third membrane type wall and a plurality of second membrane type walls, and the second membrane type walls are located between the first membrane type wall and the third membrane type wall. In order to solve the problem that the roof tube wall is damaged due to the fact that the welding position of an existing roof tube fin is prone to cracking under the influence of stress, the problem is effectively solved through the specific membrane wall structural design and the welding mode, and the stability and the reliability of the boiler water cooling wall are improved.

Description

Technical Field

[0001] This utility model relates to the field of boiler roof tube technology, specifically to a boiler membrane water-cooled wall structure. Background Technology

[0002] In the steel manufacturing industry, boilers provide a large amount of heat energy for steel production, meeting the stringent temperature requirements of processes such as billet heating and rolling. Furthermore, the steam generated by boilers serves as a power source, driving various equipment and providing the necessary kinetic energy for steel manufacturing. In addition, through waste heat recovery, boilers can convert waste heat from the production process into electricity, effectively reducing energy consumption and production costs for enterprises and improving energy efficiency.

[0003] The internal structure of a boiler includes the furnace, boiler drum, header, and water-cooled walls. The furnace provides the heat source for the entire boiler system; the boiler drum is the key part for steam collection and purification; the header is responsible for collecting and distributing the medium in the furnace tubes; and the water-cooled walls absorb the radiant heat of the flame and achieve convective heat transfer. The water-cooled walls are welded from seamless tubes and flat steel. The water-cooled walls themselves and the furnace walls they belong to are suspended from the top plate by a hanging device and can expand freely downwards.

[0004] However, the existing method of connecting the fins of the ceiling pipes is a broken weld connection. Most of the welding points are located on the ceiling pipes. Under stress, the welds crack, causing damage to the ceiling pipe walls. Utility Model Content

[0005] The purpose of this utility model is to provide a boiler membrane water-cooled wall structure to solve the problem of cracking at the weld joint of the existing roof tube fins under stress, which causes damage to the roof tube wall.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: a boiler membrane water-cooled wall structure, comprising membrane wall one, membrane wall two, membrane wall three, and a water-cooling unit. The water-cooling unit is formed by welding membrane wall one, membrane wall three, and several membrane wall twos together. The membrane wall twos are located between membrane wall one and membrane wall three. Membrane wall one includes a roof tube one and a roof tube two. One side of the roof tube one is continuously and fully welded with fins. Both sides of the roof tube two are continuously and fully welded with fins. The two fins are spot-welded together. Membrane wall three includes roof tube three, roof tube four, roof tube five, and roof tube six. The roof tube three, roof tube four, and roof tube six are connected together. Both sides of tube five are continuously and fully welded with fins. One side of the canopy tube six is ​​continuously and fully welded with fins. The fins of the canopy tubes three, four, and five that are close to each other are spot welded together. The fins on the other side of the canopy tube five are spot welded to the fins on one side of the canopy tube six. The membrane wall two includes canopy tubes seven, eight, and nine. Both sides of the canopy tubes seven, eight, and nine are continuously and fully welded with fins. The fins of the canopy tubes seven, eight, and nine that are close to each other are spot welded together. The outermost fins of the canopy tubes seven and nine are spot welded to the fins on the membrane wall one and membrane wall three, respectively.

[0007] The working principle of this utility model is as follows: A boiler membrane water-cooled wall structure, when stress is applied to each roof tube, the continuous full welding of roof tube 1 with fin 1, roof tube 7, roof tube 8 and roof tube 9 with fin 5, roof tube 3, roof tube 4, roof tube 5 with fin 3, and roof tube 6 with fin 4, allows the stress to be evenly distributed along the weld, reducing the stress burden on each roof tube and ensuring stable operation under complex stress environments; at the same time, the spot welding connection of fin 1 with fin 2, fin 5 with fin 2, and fin 5 with fin 3 allows for slight displacement between different membrane walls to release stress and avoid excessive stress accumulation at the connection points.

[0008] The beneficial effects of this invention are as follows: The combination of continuous full welding and spot welding in the connection method overcomes the problem of traditional partial welding connections being prone to cracking under stress, effectively improving the reliability of the roof tube fin connection, reducing the risk of roof tube wall damage, and extending the service life of the boiler water-cooled wall. The connection methods between the membrane walls and between the roof tubes and fins make the entire water-cooled wall structure a stable whole, better able to withstand the thermal and mechanical loads during boiler operation, ensuring stable boiler operation.

[0009] Option 2, which is a preferred option of the basic option, has arc-shaped protective plates welded onto all of the following pipes: roof pipe 1, roof pipe 2, roof pipe 3, roof pipe 4, roof pipe 5, roof pipe 6, roof pipe 7, roof pipe 8, and roof pipe 9. By setting up the arc-shaped protective plates, the stress on the pipes can be further eliminated.

[0010] Option 3, which is a preferred option of Option 2, has an arc of 45°. When the arc of the arc-shaped protective plate is 45°, the arc length of the arc-shaped protective plate is one-eighth of the pipe, which reduces the contact area between the arc-shaped protective plate and the pipe, thereby keeping the arc-shaped protective plate away from the weld of the pipe and further reducing stress.

[0011] Option 4, a preferred option of the basic option, has openings on two adjacent fins, and two adjacent roof tubes 7 and 9 located on the openings are curved; by setting the curves and openings, it is convenient to install a camera that can directly see the flame.

[0012] Option 5, which is a preferred option of Option 4, has a bending angle of 35° between two adjacent roof tubes 7 and 9; this ensures structural flexibility without affecting the strength of the entire water-cooled wall structure.

[0013] Option 6, which is a preferred option of the basic option, is that the spacing between the top tubes 7, 8 and 9 is equal, with a spacing of 120mm. The equal spacing design is conducive to the uniform flow of the medium in the water-cooled wall, ensuring the uniformity of heat transfer and improving the heat exchange efficiency of the water-cooled wall. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a boiler membrane water-cooled wall structure according to the present invention;

[0015] Figure 2 yes Figure 1 Sectional view at point BB;

[0016] Figure 3 This is a front view of the membrane wall in the boiler membrane water-cooled wall structure of this utility model;

[0017] Figure 4 yes Figure 3 Sectional view at point AA;

[0018] Figure 5 This is a top view of the membrane wall in the boiler membrane water-cooled wall structure of this utility model;

[0019] Figure 6 This is a front view of membrane wall two in a boiler membrane water-cooled wall structure of this utility model;

[0020] Figure 7 This is a top view of membrane wall two in a boiler membrane water-cooled wall structure of this utility model;

[0021] Figure 8 This is a front view of membrane wall three in a boiler membrane water-cooled wall structure of this utility model;

[0022] Figure 9This is a top view of membrane wall three in a boiler membrane water-cooled wall structure according to this utility model. Detailed Implementation

[0023] The present invention will be further described in detail below through specific embodiments:

[0024] The reference numerals in the accompanying drawings of the instruction manual include: 1-Membrane wall type one, 2-Membrane wall type two, 3-Membrane wall type three, 101-Roof tube one, 102-Roof tube two, 103-Fin one, 104-Fin two, 301-Roof tube three, 302-Roof tube four, 303-Roof tube five, 304-Roof tube six, 305-Fin three, 306-Fin four, 201-Roof tube seven, 202-Roof tube eight, 203-Roof tube nine, 204-Fin five, 4-Arc-shaped protective plate.

[0025] like Figures 1 to 9As shown: A boiler membrane water-cooled wall structure includes a membrane wall 1, a membrane wall 2, a membrane wall 3, and a water-cooling unit. The water-cooling unit is formed by welding the membrane wall 1, the membrane wall 3, and several membrane walls 2 together. The membrane walls 2 are located between the membrane wall 1 and the membrane wall 3. The membrane wall 1 includes a roof tube 101 and a roof tube 2 102. One side of the roof tube 101 is continuously and fully welded with fins 103. Both sides of the roof tube 2 are continuously and fully welded with fins 2 104. The fins 103 and fins 2 104 are spot welded together. Wall 3 includes ceiling pipe 301, ceiling pipe 4 302, ceiling pipe 5 303, and ceiling pipe 6 304. Both sides of ceiling pipes 301, 402, and 5 303 are continuously and fully welded with fins 305. One side of ceiling pipe 6 304 is continuously and fully welded with fins 4 306. The fins 305 on the adjacent sides of ceiling pipes 301, 402, and 5 303 are spot-welded together. The fins 305 on the other side of ceiling pipe 5 303 are spot-welded to fins 4 306. Membrane wall 2 includes a ceiling... Pipe 7 201, ceiling pipe 8 202, and ceiling pipe 9 203 are all continuously and fully welded to both sides with fins 5 204. The fins 5 204 on the adjacent sides of ceiling pipes 7 201, 8 202, and 9 203 are spot welded together. The outermost fins 3 305 of ceiling pipes 7 201 and 9 203 are spot welded to fins 2 104 and 3 305 respectively. The spacing between ceiling pipes 7 201, 8 202, and 9 203 is equal. The spacing is 120mm. Each of the roof tubes 101, 102, 301, 402, 53, 6304, 7201, 8202, and 9203 is welded with an arc-shaped guard plate 4 with an arc of 45°. There are openings on two adjacent fins 305. The two adjacent roof tubes 7201 and 9203 located on the openings are curved with a bending angle of 35°.

[0026] The implementation method of this embodiment is as follows: When stress is applied to each roof tube, the continuous full welding of roof tube 101 with fin 103, roof tube 7 201, roof tube 8 202, and roof tube 9 203 with fin 5 204, roof tube 3 301, roof tube 4 302, roof tube 5 303 with fin 3 305, and roof tube 6 304 with fin 4 306 allows the stress to be evenly distributed along the weld, reducing the stress burden on each roof tube and ensuring stable operation under complex stress environment; the spot welding connection of fin 103 with fin 2 104, fin 5 204 with fin 2 104, and fin 5 204 with fin 3 305 allows for small displacement between different membrane walls to release stress and avoid excessive stress accumulation at the connection point; at the same time, the curved surface of the arc-shaped guard plate 4 can change the direction of stress transmission, allowing the stress to be dispersed along the arc-shaped surface.

[0027] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A boiler membrane water-cooled wall structure, characterized in that, It includes a membrane wall first (1), a membrane wall second (2), a membrane wall third (3) and a water cooling unit. The water cooling unit is formed by welding the membrane wall first (1), the membrane wall third (3) and several membrane walls second (2) together. The membrane walls second (2) are located between the membrane wall first (1) and the membrane wall third (3). The membrane wall first (1) includes a roof tube first (101) and a roof tube second (102). One side of the roof tube first (101) is continuously and fully welded with fin first (103). The two sides of the second roof tube (102) are continuously and fully welded with fins (104). The first fin (103) is spot welded to the second fin (104). The membrane wall three (3) includes a third roof tube (301), a fourth roof tube (302), a fifth roof tube (303), and a sixth roof tube (304). The two sides of the third roof tube (301), the fourth roof tube (302), and the fifth roof tube (303) are continuously and fully welded with fins (305). One side of the roof tube six (304) is continuously and fully welded with fin four (306). The fin three (305) of the roof tube three (301), roof tube four (302) and roof tube five (303) on one side of each other are spot welded together. The fin three (305) on the other side of the roof tube five (303) is spot welded to the fin four (306). The membrane wall two (2) includes roof tube seven (201), roof tube eight (202) and roof tube nine (203). Both sides of the roof tubes 7 (201), 8 (202), and 9 (203) are continuously and fully welded with fins 5 (204). The fins 5 (204) of the roof tubes 7 (201), 8 (202), and 9 (203) are spot welded to each other on the side closest to each other. The outermost fins 3 (305) of the roof tubes 7 (201) and 9 (203) are spot welded to fins 2 (104) and fins 3 (305) respectively.

2. The boiler membrane water-cooled wall structure according to claim 1, characterized in that, Arc-shaped protective plates (4) are welded onto the first (101), second (102), third (301), fourth (302), fifth (303), sixth (304), seventh (201), eighth (202) and ninth (203) roof pipes.

3. A boiler membrane water-cooled wall structure according to claim 2, characterized in that, The arc of the arc-shaped guard plate (4) is 45°.

4. The boiler membrane water-cooled wall structure according to claim 1, characterized in that, An opening is formed on each of the two adjacent fins (305), and the two adjacent roof tubes (201) and roof tubes (203) located on the opening are curved.

5. A boiler membrane water-cooled wall structure according to claim 4, characterized in that, The bending angle of the two adjacent roof tubes 7 (201) and 9 (203) is 35°.

6. A boiler membrane water-cooled wall structure according to claim 1, characterized in that, The spacing between the seven (201), eight (202) and nine (203) roof pipes is equal, with a spacing of 120mm.

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