Repair method of water-cooled furnace wall of incinerator

Abstract

The present invention relates to the technical field of incinerators, and in particular to a method for repairing a water-cooled furnace wall of an incinerator. The method comprises the following steps: first, removing the coke layer and erosion layer on the furnace wall surface until the metal parts are exposed on the furnace wall surface; then, using the exposed metal parts as welding points, laying an anchoring grid structure along the furnace wall surface; welding the anchoring grid structure to the welding points; and then spraying refractory material on the furnace wall and the anchoring grid structure to form a reline. The method achieves rapid repair of the water-cooled furnace wall of the incinerator through the dismantling step, the anchoring arrangement step, and the relining step, thereby avoiding the problem that the water-cooled furnace wall of the incinerator is difficult to repair and has high maintenance costs. The method has simple steps, requires a small dismantling area, effectively reduces the intensity of manual labor, and can fully utilize the original old lining for relining, resulting in high repair efficiency, resource conservation, and reduced repair costs.

Description

Technical Field

[0001] The invention relates to the technical field of incinerators, and in particular to a method for repairing a water-cooled furnace wall of an incinerator. Background Art

[0002] The water-cooled walls of an incinerator are heated surfaces arranged around the furnace, with water or a steam-water two-phase mixture flowing through the tubes. To prevent erosion and wear of the water-cooled walls by dust-laden flue gases, a layer of castable material is constructed on their surface. The water-cooled walls absorb heat from the furnace flames and protect the walls. The presence of the water-cooled walls prevents the flames from partially or completely contacting the walls, thus providing protection. Furthermore, the water-cooled walls serve to suspend the furnace walls and prevent coking.

[0003] The current technology for water-cooled incinerator walls involves welding pins and anchors onto the walls, then applying castables or plastics to protect them from erosion, corrosion, and wear from high-temperature, dusty flue gases. During maintenance, these walls are difficult to remove due to the high strength of the refractory material, requiring the use of jackhammers. This often results in pipe bursts, disrupting normal operation. Furthermore, the overall demolition area is large, resulting in long repair cycles and high costs. Summary of the Invention

[0004] The present invention provides a method for repairing a water-cooled furnace wall of an incinerator, which is used to solve the defects of the prior art that the water-cooled furnace wall is difficult to repair and has high maintenance costs, thereby realizing the reconstruction of the lining of the water-cooled furnace wall, saving resources and reducing costs.

[0005] The present invention provides a method for repairing a water-cooled furnace wall of an incinerator, comprising:

[0006] Remove the coke layer and erosion layer on the furnace wall surface until the metal parts are exposed on the furnace wall surface;

[0007] Setting welding points based on the metal part;

[0008] Laying an anchoring grid structure along the surface of the furnace wall, and connecting the anchoring grid structure to the welding points;

[0009] The furnace wall and the anchoring grid structure are sprayed with refractory material to form a re-lining.

[0010] According to one embodiment of the present invention, the step of removing the coke layer and the erosion layer on the furnace wall surface until the metal parts are exposed on the furnace wall surface includes:

[0011] Use pneumatic tools to remove the refractory materials at the preset welding points at intervals of 100 to 400 mm.

[0012] According to one embodiment of the present invention, the further embodiment includes:

[0013] Remove loose refractory materials from the furnace wall surface and use high-pressure air to blow away the remaining refractory lining.

[0014] According to one embodiment of the present invention, the step of setting welding points based on the metal part includes:

[0015] The metal parts exposed on the surface of the furnace wall are used as welding points, and the distance between adjacent metal parts is set at 200-300mm.

[0016] According to one embodiment of the present invention, the further embodiment includes:

[0017] Flat steel is welded to serve as welding points at the preset welding point positions where metal parts are missing on the furnace wall surface.

[0018] According to one embodiment of the present invention, the further embodiment includes:

[0019] The soldering points are polished to reveal the original color of the metal.

[0020] According to one embodiment of the present invention, the step of laying the anchoring grid structure along the furnace wall surface includes:

[0021] The anchoring grid structure is formed into a unit of 2 square meters, and multiple units of the anchoring grid structure are spliced ​​together.

[0022] According to one embodiment of the present invention, the step of spraying refractory material on the furnace wall and the anchoring grid structure to form a re-lining comprises:

[0023] Spray the corresponding refractory material according to the original lining material of the furnace wall.

[0024] According to one embodiment of the present invention, the refractory material includes one or more of sol-gel bonded silicon carbide, mullite and corundum.

[0025] According to one embodiment of the present invention, the thickness of the furnace wall is sprayed to 40 mm by spraying the refractory material.

[0026] The present invention provides a method for repairing a water-cooled furnace wall in an incinerator. First, the coke layer and erosion layer on the furnace wall surface are removed, exposing the metal parts on the furnace wall surface. The exposed metal parts are then used as welding points to lay an anchoring grid structure along the furnace wall surface. The anchoring grid structure is welded to the welding points, and the furnace wall and anchoring grid structure are then sprayed with refractory material to form a reline. This method, through the steps of removal, anchoring arrangement, and relining, enables rapid repair of the water-cooled furnace wall of an incinerator, avoiding the problems of difficult repair and high maintenance costs associated with water-cooled furnace walls. The method features simple procedures, minimizes the area removed, effectively reduces labor intensity, and fully utilizes the existing old lining for relining, resulting in high repair efficiency, resource conservation, and reduced repair costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a flowchart of the steps of the method for repairing the water-cooled furnace wall of an incinerator provided by an embodiment of the present invention;

[0029] Figure 2 This is a schematic structural diagram of a water-cooled furnace wall before repair provided by an embodiment of the present invention;

[0030] Figure 3 Schematic diagram of the structure of the steel wire mesh provided by an embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the internal structure of a water-cooled furnace wall provided by an embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the spraying operation structure provided by an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of a water-cooled furnace wall after repair provided by an embodiment of the present invention;

[0034] Figure 7 It is a schematic diagram of the internal structure of the incinerator provided by an embodiment of the present invention.

[0035] Reference numerals:

[0036] 1. Water-cooled furnace wall; 2. Metal parts; 3. Original lining; 4. Steel wire mesh; 5. Repair-welded flat steel; 61. Air compressor; 62. Discharge scraper; 63. Mixer; 64. Nozzle; 65. Water tank; 66. Plunger pump; 67. Transport pipeline; 7. Re-lining; 71. Silicon carbide spray material area; 72. Corundum spray material area; 73. Corundum mullite spray material area; 74. Mullite spray material area. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0041] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0042] The following combination Figure 1-Figure 7 Specific embodiments of the present invention are described.

[0043] like Figure 1 As shown, an embodiment of the present invention provides a method for repairing a water-cooled furnace wall of an incinerator, the method comprising the following steps:

[0044] Step 1: remove the coke layer and the erosion layer on the furnace wall surface, so that the metal parts 3 inside the water-cooled furnace wall 1 are exposed on the furnace wall surface.

[0045] like Figure 2 As shown, the water-cooled furnace wall 1 originally had multiple metal parts 2 inside, and the original lining 3 covered the metal parts 2. During repair, pneumatic tools were used to remove the coke layer and erosion layer on the surface of the furnace wall, revealing the original lining 3 and metal parts 2.

[0046] In this step, the metal part 2 is exposed in order to use the metal part 2 as a welding point in the subsequent steps. Therefore, after the metal part 2 is exposed, it is necessary to check whether the position of the welding point of the exposed metal part 2 meets the requirements.

[0047] Specifically, pneumatic tools can be used to remove the refractory material at the fin position at the preset welding point according to the pipe spacing of about 100 to 400 mm. After the removal is completed, the remaining original lining 3 is inspected one by one, loose refractory material is removed, and the remaining refractory lining is blown away with high-pressure air.

[0048] Step 2: Setting welding points based on metal part 2.

[0049] In this step, welding spots are arranged along the height and width of the water-cooled furnace wall 1, and the original metal parts 2 are used as welding spots so that other objects can be welded.

[0050] In one embodiment, the distance between adjacent metal pieces 2 may be set to 200-300 mm.

[0051] like Figure 3 As shown, preferably, the plurality of metal parts 2 are arranged in a rectangular shape, and the size of the rectangular shape is 200-300 mm×200-300 mm.

[0052] In this step, in order to ensure that the metal part 2 is welded firmly, the surface of the metal part 2 needs to be polished, and the metal part 2 at each welding point is polished to the original color of the metal to ensure that the welding is firm.

[0053] In one embodiment, the water-cooled furnace wall 1 lacks a metal part 2 at a local preset welding point. A repair flat steel 5 can be provided at the local missing welding point, and the repair flat steel 5 plays a role equivalent to that of the metal part 2.

[0054] Similarly, the flat steel 5 for each welding point is polished to the original color of the metal to ensure that the welding is firm.

[0055] Step three: lay the anchoring grid structure along the furnace wall surface and connect the anchoring grid structure with the welding points.

[0056] In this step, the anchoring grid structure is arranged along the height and width direction of the water-cooled furnace wall 1, such as Figure 3 As shown, the anchoring grid structure can be a wire mesh 4.

[0057] Preferably, the steel mesh 4 is characterized by a diameter or thickness of ≥2 mm, a hole pitch of 30-90 mm, and a mesh shape of the steel mesh 4 that can be diamond, square, hexagonal, or the like.

[0058] In one embodiment, the material of the steel mesh 4 is heat-resistant steel, and the material of the steel mesh 4 is preferably 12Cr13, 06Cr19Ni10, 06Cr25Ni20, etc.

[0059] like Figure 4 As shown, when the wire mesh 4 is set, the wire mesh 4 is 10 to 50 mm away from the outermost side of the water-cooled furnace wall 1, and the wire mesh 4 is welded to the metal part 2 at the preset welding point position and the repair flat steel 5 to fix the wire mesh 4.

[0060] Preferably, the steel mesh 4, the metal part 2 and the repair flat steel 5 are fixed by full welding.

[0061] In one embodiment, the wire mesh 4 is cut and overlapped at about 2 square meters, and the size of the wire mesh 4 is set according to the repair area.

[0062] Step 4: Spray refractory material on the furnace wall and anchoring grid structure to form a re-lined surface.

[0063] After the welding of the steel mesh 4 is completed, refractory material is sprayed on the water-cooled furnace wall 1 and the steel mesh 4 , and the steel mesh 4 is covered with the refractory material to form a reconstituted lining 7 , thereby completing the repair of the water-cooled furnace wall 1 .

[0064] like Figure 5 As shown, the water-cooled furnace wall 1 is sprayed using a spraying device. The spraying device includes an air compressor 61, which is sequentially connected to a discharge scraper 62 and a mixer 63 via a transport line 67. A water tank 65 is connected to a plunger pump 66 via another line, which is then connected to a nozzle 64 via a transport line 67. The water-cooled furnace wall 1 is sprayed through the nozzle 64, completing the construction of the reline 7.

[0065] The water-cooled furnace wall 1 after spraying is as follows Figure 6 As shown, preferably, the thickness of the furnace wall is sprayed to 40 mm by spraying refractory material.

[0066] In this embodiment, the refractory material is sprayed according to the original lining material of the furnace wall. The refractory material includes one or more of sol-gel bonded silicon carbide, mullite and corundum.

[0067] like Figure 7As shown, different locations within the incinerator have different linings for the water-cooled furnace walls. These include silicon carbide spray coating area 71, corundum spray coating area 72, corundum-mullite spray coating area 73, and mullite spray coating area 74. During spraying, a sol-gel combination of silicon carbide, mullite, or corundum spray coating is applied to a thickness of 40 mm, depending on the existing lining material.

[0068] After the re-lining 7 is completed, the surface is partially modified manually to make the thickness meet the requirements and the surface smooth.

[0069] This method achieves rapid repair of the water-cooled furnace wall of an incinerator through a removal step, an anchoring arrangement step, and a relining step, thereby avoiding the difficulty of repairing the water-cooled furnace wall of an incinerator and the high maintenance cost. The method has simple steps, requires minimal demolition area, effectively reduces labor intensity, and fully utilizes the existing old lining for relining, resulting in high repair efficiency, resource conservation, and reduced repair costs. Two specific embodiments of this repair method are described below.

[0070] Example 1:

[0071] When repairing the water-cooled furnace wall of a channel of a garbage incinerator, pneumatic tools are used to remove the coke layer and erosion layer on the surface of the furnace wall to expose the original color of the lining and metal parts 2. Then, the positions of the welding points of the exposed metal parts 2 are checked to see if they meet the requirements.

[0072] Add new welding points and use pneumatic tools to remove the refractory materials at the fin positions at the preset welding points according to the distance of three pipes.

[0073] After the dismantling is completed, the remaining lining is inspected one by one, loose refractory materials are removed, and the remaining refractory lining is blown away with high-pressure air.

[0074] Arrange welding points along the height and width of the water-cooled furnace wall 1, use the original metal parts 2, with a spacing of 300mm×300mm, and weld flat steel 5 at the local missing welding points. The welding point positions need to be polished to the original color of the metal to ensure that the welding is firm.

[0075] A steel mesh 4 is arranged along the height and width of the water-cooled furnace wall 1. The steel mesh 4 is characterized by a diameter of 6 mm, a hole pitch of 80 mm × 100 mm, a diamond mesh, and a distance of 20 mm from the outermost side of the water-cooled furnace wall 1. The steel mesh 4 is cut and overlapped according to about 2 square meters. The steel mesh 4 is fixed to the metal part 2 and the flat steel by full welding.

[0076] The original lining material is mullite, such as Figure 7As shown, the corundum mullite spray coating area 73 adopts a spraying method to construct a sol-gel combined with mullite and other materials spray coating with a thickness of 40 mm. The specific material weight ratio is: 0-5 mullite 68%, 180 mesh mullite powder 18%, 5u coke gem powder 8%, 92 silica fume 4%, high alumina cement 2%, plus sodium tripolyphosphate 0.15%, sodium hexametaphosphate 0.1%, and silica sol 8%.

[0077] Finally, the surface is partially modified manually to ensure that the thickness meets the requirements and the surface is smooth.

[0078] Example 2:

[0079] During repairs on the water-cooled furnace wall of a CFB boiler, pneumatic tools are used to remove the coke and erosion layers on the surface of the furnace wall 1, exposing the original lining and metal component 2. The weld locations of the exposed metal component 2 are then inspected for compliance. For new welds, pneumatic tools are used to remove the refractory material at the fin locations at the pre-set weld points, at intervals of three pipes. After removal, the remaining lining is inspected location by location, loose refractory material removed, and high-pressure air is used to purge the remaining refractory material.

[0080] Welding points are arranged along the height and width of the water-cooled furnace wall 1. Using the existing metal parts 2, the gaps are spaced 250mm x 250mm apart. Flat steel bars 5 are welded to the missing weld points. The weld points need to be polished to the original metal color to ensure a secure weld. A wire mesh with a diameter of 4mm and a hexagonal mesh with a hole spacing of 100mm x 120mm is arranged along the height and width of the water-cooled furnace wall. The wire mesh is 20mm away from the outermost edge of the water-cooled furnace wall. The wire mesh is cut and overlapped at about 2 levels. The wire mesh, metal parts, and flat steel bars are fixed with full welding.

[0081] The original lining 3 is made of silicon carbide, and the sol-gel combined with silicon carbide and other materials spray coating is 30mm thick by spraying. The specific material weight ratio is: 0-5 silicon carbide 68%, 200 mesh silicon carbide powder 12%, 5u high alumina micropowder 8%, alumina powder 6%, 92 silica fume 4%, high alumina cement 2%, additional polycarboxylate 0.1%, and silica sol 10%.

[0082] Finally, the surface is partially modified manually to ensure that the thickness meets the requirements and the surface is smooth.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for repairing a water-cooled furnace wall of an incinerator, characterized in that: include: Remove the coke layer and erosion layer on the furnace wall surface until the metal parts are exposed on the furnace wall surface; Setting welding points based on the metal part; Laying an anchoring grid structure along the surface of the furnace wall, and connecting the anchoring grid structure to the welding points; spraying refractory material on the furnace wall and the anchoring grid structure to form a re-lining; The step of removing the coke layer and the erosion layer on the furnace wall surface until the metal parts are exposed on the furnace wall surface comprises: Use pneumatic tools to remove the refractory materials at the preset welding points at intervals of 100 to 400 mm; Also includes: The loose refractory material on the surface of the furnace wall is removed and the residual refractory lining is blown away by high-pressure air; the step of setting the welding point based on the metal parts includes: The metal parts exposed on the surface of the furnace wall are used as welding points, and the distance between adjacent metal parts is set at 200-300mm; and further comprising: Welding flat steel as welding points at the preset welding point positions where metal parts are missing on the furnace wall surface, and also including: The welding points are polished to expose the original metal color of the welding points; the step of laying the anchoring grid structure along the furnace wall surface includes: The anchoring grid structure is formed into a unit of 2 square meters, and multiple units of the anchoring grid structure are spliced ​​together; the step of spraying refractory material on the furnace wall and the anchoring grid structure to form a re-lining includes: The corresponding refractory material is sprayed according to the original lining material of the furnace wall, and the thickness of the furnace wall is sprayed to 40 mm by spraying the refractory material.

2. The method for repairing the water-cooled furnace wall of an incinerator according to claim 1, characterized in that: The refractory material includes one or more of sol-gel bonded silicon carbide, mullite and corundum.

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