Boiler water wall with heat receiving surface resistant to erosion

Abstract

The utility model relates to a kind of boiler water-cooled wall of heated surface anti-abrasion, including water-cooled wall pipe, and the fin being connected between water-cooled wall pipe, further including welded on the anti-abrasion grating of water-cooled wall, and the anti-abrasion plate being connected on anti-abrasion grating, the anti-abrasion grating includes grid-shaped arrangement's horizontal plate and vertical plate, the side of vertical plate is equipped with the connecting plate that is attached to fin, the back of anti-abrasion plate is equipped with the arc-shaped recess corresponding with water-cooled wall pipe, front is equipped with several horizontal baffle, both sides are equipped with the ear plate that is attached to the front of connecting plate, the connecting plate is equipped with pressing plate and fixed bolt, fixed bolt is screwed and connects the front of connecting plate in pressing plate;Realized that anti-abrasion plate is connected on anti-abrasion grating, utilize the arc-shaped recess of back attachment water-cooled wall pipe, instead of the heated surface of water-cooled wall pipe to accept flue gas scouring, extend the service life of water-cooled wall pipe, and there is horizontal baffle on the front of anti-abrasion plate, secondary deceleration outside anti-abrasion grating is carried out, reduce flue gas particle to anti-abrasion plate scouring, erosion.

Description

Technical Field

[0001] This invention relates to the field of boiler water-cooled wall technology, and more particularly to a boiler water-cooled wall with anti-abrasion properties on the heated surface. Background Technology

[0002] The water-cooled wall is the main heating component of the boiler, consisting of several rows of steel pipes distributed around the boiler furnace. During boiler operation, impurities such as coal ash, unreacted limestone, and limestone desulfurization reaction products are transported to the boiler by the incoming airflow and combustion heat. These flue gas particles fall along the furnace walls at different heights, forming an internal material circulation. This cascading material forms a wall-adhering flow, which erodes the water-cooled wall, causing severe wear on the membrane wall's heating surface. To address the wear problem caused by flue gas particles eroding the boiler water-cooled wall, an anti-wear grid consisting of overlapping horizontal and vertical plates is typically welded onto the heating surface of the water-cooled wall. The collision of flue gas particles with the horizontal and vertical plates generates splashing and reflection motions, forcing the high-speed flowing particles to slow down and reducing wear on the water-cooled wall. However, some areas on the heating surface of the water-cooled wall are directly eroded by flue gas particles, making it difficult to effectively reduce particle velocity. In these areas, the wear-resistant plates on the tube surface thin out more quickly, affecting the service life of the heating surface. Replacement is required every time the boiler is shut down, resulting in significant replacement costs. Therefore, designing a boiler water-cooled wall that can reduce the erosion velocity of flue gas particles and slow down the thinning of the wear-resistant plates has become an urgent technical problem to be solved. Summary of the Invention

[0003] To solve the above problems, the present invention provides a boiler water-cooled wall with a heat-receiving surface that is resistant to abrasion.

[0004] The present invention provides a boiler water-cooled wall with anti-abrasion properties for the heated surface, comprising water-cooled wall tubes and fins connected between the water-cooled wall tubes, as well as an anti-abrasion grid welded to the water-cooled wall and an anti-abrasion plate connected to the anti-abrasion grid. The anti-abrasion grid comprises horizontal and vertical plates arranged in a grid pattern. The sides of the vertical plates are provided with connecting plates that fit against the fins. The back of the anti-abrasion plate is provided with an arc-shaped groove corresponding to the water-cooled wall tube. The front is provided with several horizontal partitions, and the sides are provided with ear plates that fit against the front of the connecting plates. The connecting plates are provided with pressure plates and fixing bolts, and the fixing bolts are threadedly connected to the pressure plates on the front of the connecting plates.

[0005] With the above structure, by connecting the wear-resistant plate to the position on the heated surface of the water-cooled wall that is directly subjected to flue gas scouring, the wear-resistant plate replaces the heated surface itself and avoids thinning of the heated surface of the water-cooled wall tubes. Because the wear-resistant plate is connected within the mesh of the wear-resistant grid, the horizontal and vertical plates initially slow down the scouring speed of the flue gas. Then, the flue gas particles collide with the horizontal partitions on the front of the wear-resistant plate, further slowing down the flue gas speed, thus improving the wear-resistant plate's anti-wear capability and reducing replacement costs. The ear plates on both sides of the wear-resistant plate are attached to the front of the connecting plate, ensuring... The fixed bolt threaded connection pressure plate is on the front of the connecting plate. The pressure plate presses the ear plate onto the connecting plate for fixation. The fixing bolt can be rotated to separate the pressure plate from the connecting plate. The pressure plate can be removed and the wear plate can be taken away for replacement. This realizes that the wear plate is connected to the wear-resistant grid. The arc-shaped groove on the back fits the water-cooled wall tube, replacing the heated surface of the water-cooled wall tube to receive the flue gas scouring, thus extending the service life of the water-cooled wall tube. A transverse baffle is provided on the front of the wear plate to perform secondary deceleration outside the wear-resistant grid, reducing the scouring and erosion of the wear plate by flue gas particles.

[0006] As a further improvement of this utility model, the wear-resistant plate also includes several wear-resistant tiles, which are arranged and spliced ​​with the horizontal partition in the vertical direction to form the wear-resistant plate. The arc-shaped groove is provided on the inner side of the wear-resistant tile and the horizontal partition, the ear plate is provided on both sides of the wear-resistant tile, the horizontal partition is provided with a vertical insertion rod along the edge of the arc-shaped groove, and the upper and lower end faces of the wear-resistant tile are provided with insertion holes that match the insertion rod.

[0007] With the above structure, the wear-resistant tiles and the horizontal partitions are arranged and spliced ​​in the vertical direction to form the wear-resistant plate. During splicing, different numbers of wear-resistant tiles are arranged between the horizontal partitions, and the spacing of the horizontal partitions is flexibly adjusted to match the scouring intensity of the flue gas particles. The insertion rods on the horizontal partitions are inserted into the insertion holes on the wear-resistant tiles to prevent the horizontal partitions from falling out between the wear-resistant tiles when splicing the wear-resistant plate, thus reducing the difficulty of the splicing operation.

[0008] As a further improvement of this utility model, the end face of the insertion rod is provided with a raised spherical surface.

[0009] With the above structure, the end face of the insertion rod is provided with a raised spherical surface. When the insertion rod of the transverse partition is inserted into the insertion hole of the anti-wear tile, the spherical surface contacts the opening of the insertion hole to guide it, making it easier for the insertion rod to be aligned with the insertion hole.

[0010] As a further improvement of this utility model, the back of the pressure plate is provided with extrusion teeth for pressing against the ear plate.

[0011] With the above structure, the pressure of the pressure plate on the ear plate is increased by the extrusion teeth on the back of the pressure plate to press against the ear plate, thus preventing the ear plate from sliding.

[0012] As a further improvement of this utility model, both the surface of the water-cooled wall tube and the front of the wear-resistant plate are provided with a nickel-chromium-molybdenum wear-resistant layer.

[0013] With the above structure, a nickel-chromium-molybdenum anti-wear layer is provided on both the surface of the water-cooled wall tube and the front of the anti-wear plate. The nickel-chromium-molybdenum anti-wear layer is composed of a nickel-chromium-molybdenum alloy, which further improves the corrosion resistance and wear resistance of the water-cooled wall tube and the anti-wear plate, and extends the service life of the water-cooled wall. Attached Figure Description

[0014] Figure 1 The diagram shown is a structural schematic of this utility model and the pressure plate in its removed state.

[0015] Figure 2 The diagram shows the assembled structure of the abrasion-resistant plate.

[0016] 1-Water-cooled wall tube, 2-Fin, 3-Abrasion-resistant plate, 4-Horizontal plate, 5-Vertical plate, 6-Connecting plate, 7-Arc-shaped groove, 8-Horizontal partition, 9-Ear plate, 10-Pressure plate, 11-Fixing bolt, 12-Abrasion-resistant tile, 13-Insertion rod, 14-Insertion hole, 15-Spherical surface, 16-Extruded protrusion. Detailed Implementation

[0017] like Figures 1-2 The boiler water-cooled wall shown is designed to prevent abrasion on the heated surface. It includes water-cooled wall tubes 1 and fins 2 connected between the water-cooled wall tubes 1. It also includes an anti-abrasion grid welded to the water-cooled wall and an anti-abrasion plate 3 connected to the anti-abrasion grid. The anti-abrasion grid includes horizontal plates 4 and vertical plates 5 arranged in a grid pattern. The side of the vertical plate 5 is provided with a connecting plate 6 that fits against the fins 2. The back of the anti-abrasion plate 3 is provided with an arc-shaped groove 7 corresponding to the water-cooled wall tube 1. The front is provided with several horizontal partitions 8. The sides are provided with ear plates 9 that fit against the front of the connecting plate 6. The connecting plate 6 is provided with a pressure plate 10 and a fixing bolt 11. The fixing bolt 11 is threadedly connected to the pressure plate 10 on the front of the connecting plate 6.

[0018] By connecting the wear-resistant plate 3 to the position on the heated surface of the water-cooled wall that is directly subjected to flue gas scouring, the heated surface of the water-cooled wall tube 1 is prevented from being thinned. The wear-resistant plate 3 is connected within the mesh of the wear-resistant grid. Firstly, the horizontal plates 4 and vertical plates 5 slow down the scouring speed of the flue gas. Then, the flue gas particles collide with the horizontal partition plate 8 on the front of the wear-resistant plate 3, further slowing down the flue gas speed. This improves the wear resistance of the wear-resistant plate 3 and reduces replacement costs. The ear plates 9 on both sides of the wear-resistant plate 3 are attached to the front of the connecting plate 6, and the fixing bolts 11 are threadedly connected to the pressure plate. 10 On the front of the connecting plate 6, the pressure plate 10 presses the ear plate 9 onto the connecting plate 6 for fixation. The fixing bolt 11 can be rotated to separate the pressure plate 10 from the connecting plate 6. The pressure plate 10 can be removed and the anti-wear plate 3 can be taken away for replacement. This realizes that the anti-wear plate 3 is connected to the anti-wear grid, and the arc-shaped groove 7 on the back is used to fit the water-cooled wall tube 1, replacing the heated surface of the water-cooled wall tube 1 to receive the flue gas scouring, thus extending the service life of the water-cooled wall tube 1. A transverse partition 8 is provided on the front of the anti-wear plate 3 to perform secondary deceleration outside the anti-wear grid, reducing the scouring and erosion of the anti-wear plate 3 by flue gas particles.

[0019] The wear-resistant plate 3 also includes several wear-resistant tiles 12, which are arranged and assembled with the horizontal partition 8 in a vertical direction to form the wear-resistant plate 3. The arc-shaped groove 7 is provided on the inner side of the wear-resistant tile 12 and the horizontal partition 8. The ear plate 9 is provided on both sides of the wear-resistant tile 12. The horizontal partition 8 is provided with a vertical insertion rod 13 along the edge of the arc-shaped groove 7. The upper and lower end faces of the wear-resistant tile 12 are provided with insertion holes 14 that match the insertion rod 13.

[0020] The wear-resistant plate 3 is formed by arranging and splicing the wear-resistant tiles 12 and the horizontal partitions 8 in a vertical direction. During splicing, different numbers of wear-resistant tiles 12 are arranged between the horizontal partitions 8, and the spacing of the horizontal partitions 8 is flexibly adjusted to match the scouring intensity of the flue gas particles. The insertion rods 13 on the horizontal partitions 8 are inserted into the insertion holes 14 on the wear-resistant tiles 12 to prevent the horizontal partitions 8 from falling out between the wear-resistant tiles 12 when splicing the wear-resistant plate 3, thus reducing the difficulty of the splicing operation.

[0021] The end face of the insertion rod 13 is provided with a raised spherical surface 15.

[0022] The end face of the insertion rod 13 is provided with a raised spherical surface 15. When the insertion rod 13 of the transverse partition 8 is inserted into the insertion hole 14 of the anti-wear tile 12, the spherical surface 15 contacts the opening of the insertion hole 14 to guide it, making it easier for the insertion rod 13 to be aligned with the insertion hole 14.

[0023] The back of the pressure plate 10 is provided with extrusion teeth 16 for pressing against the ear plate 9.

[0024] By providing pressing protrusions 16 on the back of the pressure plate 10 to press against the ear plate 9, the pressure of the pressure plate 10 on the ear plate 9 is increased, thus preventing the ear plate 9 from sliding.

[0025] Both the surface of the water-cooled wall tube 1 and the front of the wear-resistant plate 3 are provided with a nickel-chromium-molybdenum wear-resistant layer.

[0026] Both the surface of the water-cooled wall tube 1 and the front of the wear-resistant plate 3 are provided with a nickel-chromium-molybdenum wear-resistant layer, which is composed of a nickel-chromium-molybdenum alloy. This further improves the corrosion resistance and wear resistance of the water-cooled wall tube 1 and the wear-resistant plate 3, and extends the service life of the water-cooled wall.

Claims

1. A boiler water-cooled wall with anti-abrasion properties for the heated surface, comprising water-cooled wall tubes (1) and fins (2) connected between the water-cooled wall tubes (1), characterized in that: It also includes a wear-resistant grid welded to the water-cooled wall and a wear-resistant plate (3) connected to the wear-resistant grid. The wear-resistant grid includes horizontal plates (4) and vertical plates (5) arranged in a grid pattern. The side of the vertical plate (5) is provided with a connecting plate (6) that fits into the fin (2). The back of the wear-resistant plate (3) is provided with an arc-shaped groove (7) corresponding to the water-cooled wall tube (1). The front is provided with several horizontal partitions (8). The sides are provided with ear plates (9) that fit into the front of the connecting plate (6). The connecting plate (6) is provided with a pressure plate (10) and a fixing bolt (11). The fixing bolt (11) is threaded to the pressure plate (10) on the front of the connecting plate (6).

2. The boiler water-cooled wall with anti-abrasion properties for the heated surface according to claim 1, characterized in that: The wear-resistant plate (3) also includes several wear-resistant tiles (12), which are arranged and spliced ​​with the horizontal partition (8) in the vertical direction to form the wear-resistant plate (3). The arc-shaped groove (7) is provided on the inner side of the wear-resistant tile (12) and the horizontal partition (8). The ear plate (9) is provided on both sides of the wear-resistant tile (12). The horizontal partition (8) is provided with a vertical insertion rod (13) along the edge of the arc-shaped groove (7). The upper and lower end faces of the wear-resistant tile (12) are provided with insertion holes (14) that match the insertion rod (13).

3. The boiler water-cooled wall with anti-abrasion properties for the heated surface according to claim 2, characterized in that: The end face of the insertion rod (13) is provided with a raised spherical surface (15).

4. The boiler water-cooled wall with anti-abrasion properties for the heated surface according to claim 1, characterized in that: The back of the pressure plate (10) is provided with extrusion teeth (16) for pressing against the ear plate (9).

5. A boiler water-cooled wall with anti-abrasion properties for the heated surface according to claim 1, characterized in that: Both the surface of the water-cooled wall tube (1) and the front of the wear-resistant plate (3) are provided with a nickel-chromium-molybdenum wear-resistant layer.

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