Anti-abrasion device in boiler hearth and transformation method

Abstract

The anti-abrasion device in the boiler hearth is characterized in that the anti-abrasion device comprises a refractory belt and anti-abrasion platforms, the refractory belt is provided with the anti-abrasion platforms, each anti-abrasion platform is composed of a scratch nail and a corundum anti-abrasion plastic layer, the scratch nails are fixed to a fin at the intersection position above the refractory belt in a welded mode, and the scratch nails are welded to the corundum anti-abrasion plastic layer. According to the refractory belt, the height of the refractory belt is increased, a wear-resistant platform is built by corundum wear-resistant plastic in a refractory layer transition area, and after the height is increased, the quantity of solid materials flowing downwards along the pipe wall surface is greatly reduced, so that the wear of the materials to the pipe wall is also reduced; the wear-resisting platform is designed, the flowing direction of materials can be changed through natural accumulation of the materials, and therefore abrasion of the materials to the pipe wall is reduced to a certain degree; abrasion of materials to the pipe wall is reduced, so that the service life of the pipe wall is prolonged, the maintenance cost is saved, and the operation cycle of the boiler is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of boiler equipment, and in particular to an anti-wear device in a boiler furnace and a modification method thereof. Background Art

[0002] The fire-prevention zone is also called the combustion zone, which refers to a layer of refractory material laid around the water-cooled wall tube near the burner elevation. In boilers that use low-quality, difficult-to-burn pulverized coal or circulating fluidized bed boilers, the water-cooled wall around the burner is covered with refractory material, and this covered area is called the fire-prevention zone.

[0003] The main function of the guard belt is to adjust the heat absorption and release during the combustion of pulverized coal, as well as the stability of combustion. When burning pulverized coal with low volatility, the guard belt can reduce the heat absorption of the covered water-cooled wall, increase the temperature of the combustion area, and thus enhance the stability of combustion. When burning pulverized coal with high volatility, the combustion process can be adjusted by reducing the area of ​​the guard belt.

[0004] During boiler operation, the area near the intersection of the fire zone and the water wall is where the material scours the water wall more severely. Long-term local scouring of materials causes serious wear of the tubes and thinning of the tube walls, which will greatly shorten the service life of the tube row in this area. In addition, in order to avoid leakage accidents, the operation cycle of the boiler has to be shortened, which also increases the maintenance cost and is not conducive to the long-term operation of the boiler.

[0005] In view of this, a boiler furnace anti-wear device and a modification method are proposed to solve the above problems. Summary of the invention

[0006] In response to the above technical problems, the present invention provides an anti-wear device and modification method for the boiler furnace, which increases the height of the fire-preserving belt and builds a wear-resistant platform with corundum wear-resistant plastic in the transition zone of the refractory layer to reduce the wear of the material on the pipe wall, thereby increasing the service life of the pipe wall, saving maintenance costs, and extending the operation cycle of the boiler.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] The wear-proof device in the furnace of a boiler is characterized in that it comprises a fire-protection belt and a wear-resistant platform. The fire-protection belt is provided with a wear-resistant platform. The wear-resistant platform is composed of a gripping nail and a corundum wear-resistant plastic layer. The gripping nail is fixed on the fin at the intersection above the fire-protection belt by welding. The outer layer of the gripping nail is provided with a corundum wear-resistant plastic layer.

[0009] Specifically, the cross section of the wear-resistant platform is configured as a T-shaped structure.

[0010] Furthermore, the top surface of the wear-resistant platform is configured as an inclined structure.

[0011] Furthermore, the top surface of the wear-resistant platform near the pipeline is lower than the top surface far from the pipeline.

[0012] The modification method of the anti-wear device in the boiler furnace comprises the following steps:

[0013] S1. Weld the grab nails on the fins at the intersection above the fire zone along the periphery of the furnace;

[0014] S2. Apply a layer of corundum wear-resistant plastic on the welding position of the nail;

[0015] S3. After the plastic is completely dry, the furnace can be started.

[0016] Specifically, the material of the grabbing nail is Cr25Ni20.

[0017] Specifically, the height range of the grasping nail welding is 39-41 mm.

[0018] Specifically, the thickness of the corundum wear-resistant plastic is 30 mm.

[0019] Beneficial effects of the present invention:

[0020] The present invention increases the height of the fire-preserving zone and uses corundum wear-resistant plastic to build a wear-resistant platform in the transition zone of the refractory layer. After the height is increased, the amount of solid materials flowing downward along the pipe wall is greatly reduced, so that the wear of the materials on the pipe wall is also reduced;

[0021] The present invention designs a wear-resistant platform, and the formation of the platform can rely on the natural accumulation of materials to change the flow direction of the materials, thereby reducing the wear of the materials on the pipe wall to a certain extent;

[0022] The present invention reduces the wear of the material on the tube wall, thereby increasing the service life of the tube wall, further saving maintenance costs and extending the operating cycle of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the existing structure;

[0024] Figure 2 It is a schematic diagram of the structure after the transformation of the present invention;

[0025] As shown in the figure: 1. Pipeline, 2. Fire-proof belt, 3. Wear-resistant platform. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1

[0030] like Figure 1 The structure before the transformation is shown in FIG. 1 . The intersection of the flame-protecting belt 2 and the water-cooled wall is an area where the water-cooled wall is severely eroded by materials. Long-term local erosion of materials causes serious wear of the tubes and thinning of the tube walls, which will greatly shorten the service life of the tube row in this area.

[0031] like Figure 2 As shown, the height of the fire-preserving belt 2 is increased, and a wear-resistant platform 3 is built with corundum wear-resistant plastic in the transition zone of the refractory layer. The wear-resistant platform 3 is composed of grabbing nails and a corundum wear-resistant plastic layer. Grabbing nails made of Cr25Ni20 are welded around the furnace along the upper edge of the fins at the intersection above the fire-preserving belt. The height is 40mm. A layer of corundum wear-resistant plastic with a thickness of 30mm is applied at the grabbing nail welding position. After the plastic is completely dry, the furnace is started.

[0032] After the height is increased, the amount of solid materials flowing downward along the tube wall is greatly reduced, so the wear of the materials on the tube wall is also reduced, and the formation of the wear-resistant platform 3 can rely on the natural accumulation of materials to change the flow direction of the materials, thereby reducing the wear of the materials on the tube wall to a certain extent, thereby increasing the service life of the tube wall, saving maintenance costs, and extending the operation cycle of the boiler.

[0033] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The anti-wear device in the boiler furnace is characterized by It includes a fire-fighting belt and a wear-resistant platform. The wear-resistant platform is arranged on the fire-fighting belt. The wear-resistant platform is composed of grabbing nails and a corundum wear-resistant plastic layer. The grabbing nails are fixed on the fins at the intersection above the fire-fighting belt by welding. The outer layer of the grabbing nails is provided with a corundum wear-resistant plastic layer.

2. The boiler furnace anti-wear device according to claim 1 is characterized in that The cross section of the wear-resistant platform is arranged in a T-shaped structure.

3. The boiler furnace anti-wear device according to claim 2 is characterized in that The top surface of the wear-resistant platform is arranged in an inclined structure.

4. A method for modifying the anti-wear device in a boiler furnace according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Weld the grab nails on the fins at the intersection above the fire zone along the periphery of the furnace; S2. Apply a layer of corundum wear-resistant plastic on the welding position of the nail; S3. After the plastic material is completely dry, the furnace can be started.

5. The boiler furnace anti-wear device according to claim 4, characterized in that The material of the grabbing nail is Cr25Ni20.

6. The boiler furnace anti-wear device according to claim 4, characterized in that The height range of the grab nail welding is 39-41mm.

7. The boiler furnace anti-wear device according to claim 4, characterized in that The thickness of the corundum wear-resistant plastic is 30 mm.

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