Corner anti-abrasion device for CFB boiler furnace

Abstract

The utility model discloses a corner anti-abrasion device for a CFB boiler hearth, relates to the technical field of boiler equipment, and solves the problems that the lower position of a water wall tube at the corner of the existing hearth is seriously abraded, and the existing anti-abrasion method is easy to cause hydrodynamic deterioration to cause tube explosion. The ash blocking device comprises a plurality of ash blocking structures, wherein the ash blocking structures are arranged at four corners in a CFB boiler hearth and are connected with a water cooling wall; the dust blocking structure is of a 90-degree V-shaped structure; a corrugated structure is arranged on the side, connected with the water cooling wall, of the ash blocking structure. The ash blocking structure is arranged on the water cooling wall of the CFB boiler hearth in a downward inclined mode. The plurality of rectifying plates are arranged between two adjacent dust blocking structures in the vertical direction and are connected with the end parts of the dust blocking structures; the rectifying plates are further connected with the water cooling wall. According to the utility model, the type of the ash curtain is adjusted through the ash blocking structure, and the distance between the ash curtain and the pipe as well as the fin is adjusted; and ash particles at the end of the ash blocking structure are prevented from being transversely ejected through the rectifying plate, and adjacent pipes on the outer side are prevented from being abraded.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler equipment, in particular to a corner anti-wear device for a CFB boiler furnace. Background Art

[0002] There is a large amount of circulating material in the furnace of the biomass circulating fluidized bed boiler (CFB boiler), which causes continuous wear on the water-cooled wall heating surface. The material concentration at the lower corner of the water-cooled wall is high and has a tendency to move horizontally, which causes aggravated wear on the lower part of the water-cooled wall tube at the corner of the furnace. In recent years, the method of adding castables to the corners has been used to prevent wear. This method is prone to deterioration of the hydrodynamics of the pipes in the area covered by the castables, causing pipe bursts. Utility Model Content

[0003] In order to solve the above-mentioned problems that the water-cooled wall tubes at the corners of the existing furnaces are seriously worn at the lower part and the existing anti-wear methods are prone to cause water dynamics deterioration and tube bursts, the utility model proposes a corner anti-wear device for the furnace of a CFB boiler. The utility model adjusts the ash curtain type through the ash retaining structure, and adjusts the distance between the ash curtain and the tubes and fins at the same time; the rectifier plate prevents the ash particles at the end of the ash retaining structure from being ejected horizontally, thereby avoiding wear of the adjacent tubes on the outside.

[0004] The utility model proposes a corner anti-wear device for a CFB boiler furnace, which specifically comprises a plurality of ash retaining structures, which are arranged at the four corners inside the CFB boiler furnace and connected to the water-cooled wall; the ash retaining structure is a 90-degree V-shaped structure; and a corrugated structure is arranged on one side where the ash retaining structure is connected to the water-cooled wall.

[0005] Furthermore, the ash retaining structure is arranged on the water-cooled wall of the CFB boiler furnace in a downwardly inclined manner.

[0006] Furthermore, the angle between the dust blocking structure and the horizontal plane is 15 degrees.

[0007] Furthermore, a plurality of ash guiding grooves are arranged on a side of the ash retaining structure away from the water-cooled wall.

[0008] Furthermore, the ash guiding trough is trapezoidal.

[0009] Furthermore, the length of the bottom of the ash guiding chute is smaller than the length of the chute opening.

[0010] Furthermore, the vertical spacing between the plurality of dust blocking structures increases sequentially from bottom to top.

[0011] Furthermore, the corner anti-wear device for the CFB boiler furnace also includes a plurality of rectifier plates, which are arranged between two adjacent ash retaining structures in the vertical direction and connected to the ends of the ash retaining structures; and the plurality of rectifier plates are also connected to the water-cooled wall.

[0012] Furthermore, an expansion joint is arranged on the rectifier plate.

[0013] Furthermore, the dust baffle structure includes two groups of dust baffle plate structures, the dust baffle plate structure includes dust baffle plate one, several dust baffle plates two and dust baffle plate three, the dust baffle plate one, several dust baffle plates two and dust baffle plate three are connected in sequence; the two groups of dust baffle plate structures are connected together through dust baffle plate one; and dust baffle plate three is connected to the rectifier plate.

[0014] The beneficial effects of the corner anti-wear device for a CFB boiler furnace described in the utility model are:

[0015] (1) The utility model discloses a corner anti-wear device for a CFB boiler furnace, which overcomes the problem that the water-cooled wall tubes at the corners of the existing furnace are seriously worn at the lower part and the existing anti-wear method is easy to cause hydrodynamic deterioration and tube burst. The horizontal dust retaining structure and the vertical rectifier plate are adopted to effectively prevent the corners from being worn. No casting material is provided, which can prevent the occurrence of hydrodynamic problems.

[0016] (2) The utility model discloses a corner anti-wear device for a CFB boiler furnace, which can adjust the ash curtain type by arranging a trapezoidal ash guide groove on the transversely arranged ash retaining structure, so that the distance between the ash curtain and the tube and the fin is the same, and at the same time, the problem of ash curtain rotation caused by the circular ash guide groove can be prevented;

[0017] (3) The utility model discloses a corner anti-wear device for a CFB boiler furnace, wherein the ash retaining structures arranged transversely have spacings that are gradually increased in the height direction, thereby reducing the heat transfer effect on the water-cooled wall;

[0018] (4) The utility model discloses a corner anti-wear device for a CFB boiler furnace, in which vertical guide plates are arranged at the ends of two adjacent ash retaining structures in the vertical direction to prevent ash particles from being ejected laterally from the ends of the ash retaining structures and wearing the adjacent pipes on the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is a structural schematic diagram of an ash retaining structure of a corner anti-wear device for a CFB boiler furnace according to the utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the ash retaining structure of the corner anti-wear device for the CFB boiler furnace and the boiler furnace according to the utility model;

[0023] Figure 3 It is a schematic diagram of the connection structure of the ash retaining structure and the rectifier plate of a corner anti-wear device for a CFB boiler furnace described in the utility model;

[0024] Figure 4 It is a schematic diagram of the change in the vertical distance between a plurality of ash retaining structures of a corner anti-wear device for a CFB boiler furnace according to the utility model;

[0025] Among them: 1-ash blocking structure, 11-ash blocking plate one, 12-ash blocking plate two, 13-ash blocking plate three, 14-ash guide groove, 15-corrugated structure, 2-rectifier plate, 21-expansion joint, 3-water cooling pipe, 4-furnace. DETAILED DESCRIPTION

[0026] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:

[0027] Specific implementation method 1: See Figure 1-Figure 4 The present embodiment is described in detail. The corner anti-wear device for the CFB boiler furnace described in the present embodiment specifically comprises a plurality of ash retaining structures 1, which are arranged at the four corners inside the CFB boiler furnace and connected to the water-cooled wall; the ash retaining structure 1 is a V-shaped structure, and the corner of the V-shaped structure is 90 degrees; a corrugated structure 15 is arranged on one side where the ash retaining structure 1 is connected to the water-cooled wall, and the position of the water-cooled pipe 3 of the water-cooled wall is avoided by the cooperation of the corrugated structure 15 and the water-cooled wall, and the ash retaining structure 1 and the fins of the water-cooled wall are directly welded together.

[0028] The ash retaining structure 1 is arranged on the water-cooled wall of the CFB boiler furnace at an angle of 15 degrees to the horizontal plane; the material moving down along the water-cooled wall moves to the ash retaining structure 1 arranged horizontally, and is ejected in a direction away from the water-cooled wall, destroying the flow along the wall, reducing the amount of material flowing along the wall, and reducing wear; at the same time, the material accumulates on the ash retaining structure 1, forming a soft landing structure, which can prevent the material from wearing the water-cooled wall when it is ejected and turned.

[0029] The ash retaining structure 1 is provided with a plurality of ash guide grooves 14 on the side away from the water-cooled wall. The ash guide grooves 14 are trapezoidal. The length of the groove bottom of the ash guide grooves 14 is less than the length of the groove opening. The ash guide grooves 14 make the distance between the ash curtain and the tube and the fins the same. The trapezoidal structure makes the ash curtain fall flatly, and no circular ash guide groove turbulence will be generated.

[0030] like Figure 4As shown, the ash retaining structure 1 is provided with multiple layers in the height direction, and the vertical spacing between the plurality of ash retaining structures 1 increases from bottom to top. As the height in the furnace increases, the material concentration decreases rapidly, and the spacing of the ash retaining structures 1 increases in the height direction, which can reduce the decrease in heat transfer caused by the destruction of the wall-adhering flow.

[0031] The corner anti-wear device for the CFB boiler furnace also includes a plurality of rectifier plates 2, which are arranged between two adjacent ash retaining structures 1 in the vertical direction and connected to the ends of the V-shaped structures of the ash retaining structures 1; the plurality of rectifier plates 2 and the fins of the water-cooled wall are connected by welding; as the spacing between the ash retaining structures 1 increases from bottom to top in the vertical direction, the number of rectifier plates 2 between two adjacent ash retaining structures 1 also increases, and the ends of the uppermost and lowermost two rectifier plates 2 are flush with the edges of the ash retaining structures 1, such as Figure 3 As shown in the figure, the length of the rectifier plate 2 is 200 mm. The ash blocking structure 1 is far away from the two ends of the furnace corners, which is prone to ash lateral ejection, causing wear of adjacent pipes. Vertical rectifier plates 2 are set at the ends to prevent wear of the pipes and eliminate vortex flow at the furnace corners.

[0032] An expansion joint 21 is provided in the middle of the rectifier plate 2 .

[0033] The dust baffle structure 1 includes two groups of dust baffle plate structures, which include dust baffle plate 1 11, several dust baffle plates 2 12 and dust baffle plates 3 13. The dust baffle plate 1 11, several dust baffle plates 2 12 and dust baffle plates 3 13 are connected in sequence; one end of the dust baffle plate 1 11 is a bevel and the other end is a straight edge. The two groups of dust baffle plate structures are connected together through the bevel of the dust baffle plate 1 11 to form a 90-degree V-shaped structure; both ends of the dust baffle plate 2 are straight edges; one end of the dust baffle plate 3 13 is a straight edge and the other end is a bevel; the end of the bevel edge of the dust baffle plate 3 13 is connected to the rectifier 2. The length of the dust baffle plate 1 11, several dust baffle plates 2 12 and dust baffle plates 3 13 is 165 mm; expansion joints are reserved between the dust baffle plate 1 11, several dust baffle plates 2 12 and dust baffle plates 3 13 during installation, and several dust baffle plates of the two groups of dust baffle plate structures are welded together during on-site installation.

[0034] Summarizing the above implementation cases, the corner anti-wear device for the CFB boiler furnace described in the utility model overcomes the problem that the lower part of the water-cooled wall tube at the corner of the existing furnace is seriously worn and the existing anti-wear method is easy to cause hydrodynamic deterioration and tube burst. The horizontal ash retaining structure 1 and the vertical rectifier plate 2 are adopted to effectively prevent the corner wear, and no casting material is set to prevent the occurrence of hydrodynamic problems. The corner anti-wear device for the CFB boiler furnace described in the utility model can adjust the ash by setting a trapezoidal ash guide groove 14 on the horizontally set ash retaining structure 1. The utility model discloses a corner anti-wear device for a CFB boiler furnace, in which the distances between the ash retaining structures 1 arranged horizontally are gradually increased along the height direction, so as to reduce the heat transfer effect on the water-cooled wall; the utility model discloses a corner anti-wear device for a CFB boiler furnace, in which vertical guide plates 2 are arranged at the ends of two adjacent ash retaining structures 1 in the vertical direction, so as to prevent ash particles at the ends of the ash retaining structures 1 from being ejected horizontally and wearing the adjacent tubes on the outside.

[0035] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the utility model. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A corner anti-wear device for a CFB boiler furnace, characterized in that: The invention comprises a plurality of ash retaining structures (1), wherein the ash retaining structures (1) are arranged at the four corners of the furnace of a CFB boiler and connected to the water-cooled wall; the ash retaining structure (1) is a 90-degree V-shaped structure; and a corrugated structure (15) is arranged on one side where the ash retaining structure (1) is connected to the water-cooled wall.

2. The corner anti-wear device for a CFB boiler furnace according to claim 1, characterized in that: The ash retaining structure (1) is arranged on the water-cooled wall of the CFB boiler furnace in a downwardly inclined manner.

3. The corner anti-wear device for a CFB boiler furnace according to claim 2, characterized in that: The angle between the dust blocking structure (1) and the horizontal plane is 15 degrees.

4. The corner anti-wear device for a CFB boiler furnace according to any one of claims 1 to 3, characterized in that: A plurality of ash guide grooves (14) are arranged on the side of the ash retaining structure (1) away from the water-cooling wall.

5. The corner anti-wear device for a CFB boiler furnace according to claim 4, characterized in that: The ash guide groove (14) is trapezoidal.

6. The corner anti-wear device for a CFB boiler furnace according to claim 5, characterized in that: The length of the bottom of the ash guide trough (14) is smaller than the length of the trough opening.

7. The corner anti-wear device for a CFB boiler furnace according to claim 1, characterized in that: The vertical spacing between the plurality of dust blocking structures (1) increases sequentially from bottom to top.

8. The corner anti-wear device for a CFB boiler furnace according to claim 1 or 7, characterized in that: The corner anti-wear device for the CFB boiler furnace also includes a plurality of rectifier plates (2), which are arranged between two adjacent ash retaining structures (1) in the vertical direction and connected to the ends of the ash retaining structures (1); the plurality of rectifier plates (2) are also connected to the water-cooled wall.

9. The corner anti-wear device for a CFB boiler furnace according to claim 8, characterized in that: An expansion joint (21) is provided on the rectifying plate (2).

10. The corner anti-wear device for a CFB boiler furnace according to claim 9, characterized in that: The dust baffle structure (1) comprises two groups of dust baffle plate structures, the dust baffle plate structures comprising a dust baffle plate one (11), a plurality of dust baffle plates two (12) and a dust baffle plate three (13), the dust baffle plate one (11), a plurality of dust baffle plates two (12) and a dust baffle plate three (13) being connected in sequence; the two groups of dust baffle plate structures are connected together via the dust baffle plate one (11); and the dust baffle plate three (13) is connected to the rectifying plate (2).

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