Incinerator water cooling wall

Abstract

The utility model relates to the technical field of incinerator equipment, solves the problem that a water cooling wall is prone to being abraded and corroded by high-temperature flue gas, and discloses an incinerator water cooling wall which comprises a plurality of water cooling pipes arranged in parallel and fins connected between every two adjacent water cooling pipes. A plurality of flow blocking units are arranged on the outer surface, facing the smoke scouring side, of the water cooling pipe in the circumferential direction, each flow blocking unit comprises two rows of flow blocking assemblies which are symmetrically arranged relative to the middle axial face of the water cooling pipe, and the two rows of flow blocking assemblies are arranged in a staggered mode in the axial direction of the water cooling pipe. Each flow blocking assembly comprises a plurality of flow blocking pieces arranged at intervals in the axial direction of the water cooling pipe, one end of each flow blocking piece is obliquely fixed to the water cooling pipe, smoke channels are formed between the flow blocking pieces and the water cooling pipe, and the opening directions of the smoke channels of the flow blocking pieces on the two columns of flow blocking assemblies are opposite. The flow baffle can buffer the impact force of the flue gas, so that the corrosion of the flue gas to the surface of the water cooling pipe is reduced; and the staggered flow baffles are provided with the flue gas channels through which the flue gas passes, so that the absorption effect of the water cooling wall on the high-temperature flue gas is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of incinerator equipment, and in particular to a water-cooled wall of an incinerator. Background Art

[0002] At present, domestic waste is generally treated by incineration in mechanical furnaces. When the incinerator burns waste, the flames and high-temperature flue gases in the furnace will cause the internal temperature to rise, so water-cooled walls composed of multiple rows of steel pipes are distributed around the furnace of the incinerator. After absorbing the radiant heat, the water-cooled walls will generate steam or hot water in the pipes, which can not only reduce the temperature of the furnace wall, but also improve energy utilization.

[0003] The water-cooled walls in the incinerator include the ceiling water-cooled wall, front wall water-cooled wall, middle wall water-cooled wall and rear wall water-cooled wall. Among them, the ceiling water-cooled wall and middle wall water-cooled wall are directly washed by the ultra-high temperature flue gas, especially the flue gas after combustion contains particles, which makes the water-cooled wall seriously worn and corroded, causing the thinning of the water-cooled wall tubes or even bursting of the tubes, affecting the safe operation of the incinerator and requiring high maintenance costs.

[0004] Currently, one type of water-cooled wall modification is to add castables to the water-cooled wall to delay over-temperature corrosion. However, the castables will reduce the heat exchange area of ​​the water-cooled wall tubes, resulting in a decrease in the thermal efficiency of the boiler, making the subsequent water-cooled wall more susceptible to corrosion. Utility Model Content

[0005] In order to improve the defect that the water-cooled wall is easily worn and corroded by high-temperature flue gas, the present application provides an incinerator water-cooled wall.

[0006] The present application provides an incinerator water-cooled wall, which adopts the following technical solution:

[0007] A water-cooled wall of an incinerator comprises a plurality of water-cooling tubes arranged in parallel and fins connected between two adjacent water-cooling tubes; a plurality of groups of baffle units are circumferentially arranged on the outer surface of the water-cooling tube facing the flue gas scouring side, the baffle units comprise two rows of baffle components symmetrically arranged about the central axis plane of the water-cooling tube, and the two rows of baffle components are staggered along the axial direction of the water-cooling tube; the baffle components comprise a plurality of baffle plates arranged at intervals along the axial direction of the water-cooling tube, one end of the baffle plates is obliquely fixed on the water-cooling tube, a flue gas channel is formed between the baffle plates and the water-cooling tube, and the openings of the flue gas channels of the baffle plates on the two rows of baffle components face oppositely.

[0008] By adopting the above technical solution, a baffle unit with a baffle plate is arranged on the outer wall of the water-cooled wall facing the flue gas scouring side, which can buffer the impact force of the flue gas and reduce the corrosion of the flue gas on the surface of the water-cooled tube; and the baffle plate has a flue gas channel for the flue gas to pass through, and the buffered flue gas can also contact the surface of the water-cooled tube. The two rows of baffle components in each group of baffle units are staggered, that is, the two baffle plates are staggered, and the openings of the two flue gas channels are facing oppositely, which can make the buffered flue gas better contact the water-cooled tube, ensuring the absorption effect of the water-cooled wall on the high-temperature flue gas, thereby improving the energy utilization rate and extending the service life of the water-cooled wall.

[0009] Optionally, the number of the baffle units is one group, one end of the baffle is connected to the position of the water cooling tube close to the fin, and the other end of the baffle extends to the central axis plane of the water cooling tube perpendicular to the fin.

[0010] By adopting the above technical solution, the number of baffle units is set to only one group, that is, the baffle assembly has only two rows, and the width of each baffle plate is close to the radius length of the water-cooling tube, so that a small number of baffle plates can have a good buffering effect on the high-temperature flue gas, and will not cause the flue gas to stay in front of the water-cooled wall in a disturbed manner, thereby ensuring the normal flow of the flue gas, so that it passes through multiple water-cooled walls in turn and is efficiently heat exchanged step by step.

[0011] Optionally, on the projection of the symmetry plane of the two rows of the baffle components, the two ends of each baffle plate along the axial direction of the water-cooling tube will overlap with the two staggered ends of the baffle plates on the other row of the baffle components.

[0012] By adopting the above technical solution, the two rows of baffle components are arranged to be partially overlapped and staggered, which can further improve the buffering effect on the flue gas and reduce the possibility of the flue gas directly impacting the water cooling pipe.

[0013] Optionally, the baffle is arc-shaped and the arc-shaped concave surface faces the water-cooling tube.

[0014] By adopting the above technical solution, since the high-temperature flue gas directly rushes toward the surface of the water-cooled wall, the baffle is set to be an arc facing the water-cooled tube, which can reduce the damage of the baffle caused by the high-temperature flue gas and better guide the buffered flue gas to the water-cooled tube to ensure the heat exchange efficiency; in addition, the flue gas laterally introduced into the surface of the water-cooled tube will also have a buffering effect on the flue gas that may directly rush in through the gap between the baffles, further reducing the possibility of the flue gas directly rushing into the water-cooled tube.

[0015] Optionally, a surfacing rod is provided at the connection between the baffle plate and the water-cooling pipe, and the surfacing welding material is a nickel-based alloy.

[0016] By adopting the above technical solution, nickel-based alloy is used for surfacing welding at the connection between the baffle plate and the water-cooling tube, which not only improves the stability of the connection between the baffle plate and the water-cooling tube, but also further improves the corrosion resistance, wear resistance, heat resistance and other properties of the baffle plate and the water-cooling tube itself, and will not affect the heat exchange efficiency of the water-cooled wall.

[0017] Optionally, a reinforcement plate connected between the baffle plate and the water cooling pipe is provided in the flue gas channel.

[0018] By adopting the above technical solution, the reinforcing plate can strengthen the support of the baffle plate, reducing the possibility that the baffle plate is deformed by the impact of high-temperature flue gas or even separated from the water-cooling pipe.

[0019] Optionally, each of the baffle plates is connected to two of the reinforcement plates, and the two reinforcement plates are arranged on both sides of the baffle plate along the axial direction of the water-cooling tube.

[0020] By adopting the above technical solution, the reinforcing sheet is set to be thinner and is connected to the baffle sheet at intervals, thereby reducing the contact area with the water-cooling pipe, thereby allowing the buffered flue gas to better contact the water-cooling pipe.

[0021] Optionally, a surface of the fin facing the flue gas is covered with a surfacing layer, and the welding material of the surfacing layer is a nickel-based alloy.

[0022] By adopting the above technical solution, the water-cooling tubes are connected by fins, and the fins can also absorb radiant heat. By surfacing a nickel-based alloy layer on the fins, not only can the corrosion resistance and heat resistance of the water-cooling wall be further improved, but the thickness of the water-cooling tube will not be increased, thereby not affecting the heat exchange efficiency, but can increase the heat exchange effect.

[0023] In summary, the present application includes at least one of the following beneficial effects:

[0024] 1. The staggered arc-shaped baffles are arranged on the outer wall of the water-cooled wall facing the flue gas scouring side, which can buffer the impact of the flue gas and reduce the corrosion of the flue gas on the surface of the water-cooled tube. The baffles have flue gas channels for the flue gas to pass through. The buffered flue gas can still contact the surface of the water-cooled tube, ensuring the absorption effect of the water-cooled wall on the high-temperature flue gas, thereby improving the energy utilization rate and extending the service life of the water-cooled wall;

[0025] 2. The connection between the baffle and the water-cooling tube, as well as the fins, are welded, which can effectively improve the corrosion resistance, wear resistance, heat resistance and other properties of the water-cooling wall, and can also improve the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the water-cooled wall of the incinerator in the embodiment of the present application;

[0027] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0028] Figure 3 2 is a schematic diagram of the structure of the connection between the water cooling tube and the fin in the embodiment of the present application;

[0029] Figure 4 It is a top view of the water-cooled wall of the incinerator in the embodiment of the present application.

[0030] Explanation of the reference numerals: 1. water cooling tube; 2. fin; 3. baffle assembly; 31. baffle plate; 32. flue gas channel; 33. cladding rod; 34. reinforcement plate; 35. cladding layer; 4. connecting layer. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 This application is described in further detail.

[0032] Reference Figure 1 and Figure 2 The embodiment of the present application discloses a water-cooled wall of an incinerator, comprising a plurality of water-cooled tubes 1 arranged in parallel and fins 2 connected between two adjacent water-cooled tubes 1; a plurality of groups of baffle units are arranged circumferentially on the outer surface of the water-cooled tube 1 facing the flue gas flushing side, and the baffle units include two rows of baffle components 3 arranged symmetrically with respect to the central axis of the water-cooled tube 1, and the two rows of baffle components 3 are staggered along the axial direction of the water-cooled tube 1; the baffle components 3 include a plurality of baffle plates 31 arranged at intervals along the axial direction of the water-cooled tube 1, one end of the baffle plates 31 is obliquely fixed on the water-cooled tube 1, a flue gas channel 32 is formed between the baffle plates 31 and the water-cooled tube 1, and the openings of the flue gas channels 32 of the baffle plates 31 on the two rows of baffle components 3 face oppositely. The baffle plates 31 can buffer the impact force of the flue gas, thereby reducing the corrosion of the flue gas on the surface of the water-cooled tube 1; and the staggered baffle plates 31 have flue gas channels 32 for the flue gas to pass through, thereby ensuring the absorption effect of the water-cooled wall on the high-temperature flue gas.

[0033] In other embodiments, the baffle units may be provided in multiple groups, and the baffle plates 31 may be formed by cutting from a flat plate.

[0034] In this embodiment, refer to Figure 2, the number of baffle units is set to only one group, that is, the baffle assembly 3 has only two rows, the baffle plate 31 is made of the same alloy steel or stainless steel as the water-cooling tube 1, the thickness of the baffle plate 31 is preferably consistent with the tube wall thickness of the water-cooling tube 1, and the angle between the baffle plate 31 and the surface of the water-cooling tube 1 is preferably between 5-30°, one end of the baffle plate 31 is connected to the position of the water-cooling tube 1 close to the fin 2, and the other end of the baffle plate 31 extends to the central axis plane perpendicular to the water-cooling tube 1 and the fin 2, which is equivalent to the width of each baffle plate 31 being close to the radius length of the water-cooling tube 1, so that a small number of baffle plates 31 can have a good buffering effect on the high-temperature flue gas, and will not cause the flue gas to disturb and stay in front of the water-cooling wall, thereby ensuring the normal flow of the flue gas, so that it can pass through multiple water-cooling walls in sequence and be efficiently heat exchanged step by step.

[0035] In other embodiments, the baffle plates 31 in two rows of baffle assemblies 3 may be arranged at staggered intervals.

[0036] In this embodiment, refer to Figure 2 In order to further improve the buffering effect on the flue gas, on the projection of the symmetry plane of the two rows of baffle components 3, the two ends of each baffle plate 31 along the axial direction of the water-cooling tube 1 will overlap with the ends of the two staggered baffle plates 31 on the other row of baffle components 3, and the overlapping length of each end is preferably one tenth of the length of the baffle plate 31. Furthermore, the ends of the baffle plates 31 of the two rows of baffle components 3 can be abutted together to improve the structural stability. The two rows of baffle components 3 are arranged to be partially overlapped and staggered, which reduces the possibility of the flue gas directly impacting the water-cooling tube 1.

[0037] Because the high-temperature flue gas directly rushes to the surface of the water-cooled wall, in order to reduce the damage of the high-temperature flue gas to the baffle 31, refer to Figure 3 The baffle 31 is stamped into an arc shape with steel, and the arc-shaped concave surface of the baffle 31 faces the water-cooling tube 1. The arc-shaped surface not only increases the structural strength, but also has a good guiding effect. At the same time, the openings of the two flue gas channels 32 are facing each other, which can better guide the buffered flue gas to the water-cooling tube 1, thereby ensuring the heat exchange efficiency. In addition, the flue gas laterally introduced into the surface of the water-cooling tube 1 will also have a buffering effect on the flue gas that may be directly washed through the gap between the baffles 31, further reducing the possibility of the flue gas directly washing the water-cooling tube 1.

[0038] In order to further improve the connection strength between the baffle plate 31 and the water cooling pipe 1, refer to Figure 3 and Figure 4, a reinforcing sheet 34 connected between the baffle plate 31 and the water-cooling tube 1 is provided in the flue gas passage 32. The material of the reinforcing sheet 34 is consistent with that of the baffle plate 31, and the reinforcing sheet 34 is fixed to the baffle plate 31 and the water-cooling tube 1 by welding. In some embodiments, the length of the reinforcing sheet 34 may be consistent with the length of the baffle plate 31; in this embodiment, the reinforcing sheet 34 is configured in the form of a thin sheet, and each baffle plate 31 is connected to two reinforcing sheets 34, and the two reinforcing sheets 34 are arranged on both sides of the baffle plate 31 along the axial direction of the water-cooling tube 1. The reinforcing sheet 34 can strengthen the support of the baffle plate 31, reduce the possibility of the baffle plate 31 being deformed by the impact of high-temperature flue gas or even detached from the water-cooling tube 1, and the reinforcing sheet 34 is configured to be thinner and connected to the baffle plate 31 at intervals, so as to reduce the contact area with the water-cooling tube 1, thereby allowing the buffered flue gas to better contact the water-cooling tube 1.

[0039] Reference Figure 4 , cladding rods 33 are arranged around the connection between the baffle plate 31 and the water-cooling tube 1, and cladding rods 33 are also arranged around the connection between the reinforcement plate 34 and the water-cooling tube 1, and the cladding material of the cladding rods 33 is a nickel-based alloy. The use of nickel-based alloy for cladding at the connection between the baffle plate 31 and the reinforcement plate 34 and the water-cooling tube 1 can not only improve the stability of the connection between the baffle plate 31 and the water-cooling tube 1, but also further improve the corrosion resistance, wear resistance, heat resistance and other properties of the baffle plate 31 and the water-cooling tube 1, and will not affect the heat exchange efficiency of the water-cooling wall.

[0040] The water cooling tubes 1 are connected by fins 2, which can also absorb the radiant heat. Figure 4 The surface of the fin 2 facing the flue gas is covered with a cladding layer 35, and the welding material of the cladding layer 35 is also a nickel-based alloy, which can not only further improve the corrosion resistance and heat resistance of the water-cooled wall, but also will not increase the thickness of the water-cooled tube 1, and thus will not affect the heat exchange efficiency, but can increase the heat exchange effect.

[0041] In addition, refer to Figure 1 and Figure 4 The parallel water-cooling tubes 1 and fins 2 form a row of water-cooling walls. Because the size of the incineration boiler is very large, multiple water-cooling walls are generally used to splice along the length direction to form a complete water-cooling wall. Preferably, the connection between two adjacent water-cooling walls is also treated with nickel-based alloy for surfacing to form a connecting layer 4. The thickness of the connecting layer 4 is 2-4 times that of the surfacing layer 35 to further improve the connection strength and corrosion resistance.

[0042] The implementation principle of the water-cooled wall of an incinerator in the embodiment of the present application is:

[0043] When the high-temperature flue gas directly flushes the water-cooled wall, a plurality of staggered and arc-shaped baffles 31 can buffer the impact of the flue gas and reduce the corrosion of the flue gas on the surface of the water-cooled tube 1. The arc-shaped structure of the baffle 31 and the support of the reinforcing sheet 34 can improve the structural strength of the baffle 31. In addition, the baffle 31 has a flue gas channel 32 for the flue gas to pass through, and the openings of the two flue gas channels 32 face each other. The buffered flue gas can also contact the surface of the water-cooled tube 1, so that the buffered flue gas can better contact the water-cooled tube 1, ensuring the absorption effect of the water-cooled wall on the high-temperature flue gas, thereby improving the energy utilization rate and extending the service life of the water-cooled wall.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An incinerator water-cooled wall, characterized in that: The invention comprises a plurality of water-cooling tubes (1) arranged in parallel and fins (2) connected between two adjacent water-cooling tubes (1); a plurality of groups of baffle units are arranged circumferentially on the outer surface of the water-cooling tube (1) facing the flue gas flushing side, the baffle units comprising two rows of baffle components (3) arranged symmetrically with respect to the central axis plane of the water-cooling tube (1), and the two rows of baffle components (3) are arranged staggered along the axial direction of the water-cooling tube (1); the baffle components (3) comprise a plurality of baffle plates (31) arranged at intervals along the axial direction of the water-cooling tube (1), one end of the baffle plate (31) is fixed obliquely on the water-cooling tube (1), a flue gas channel (32) is formed between the baffle plate (31) and the water-cooling tube (1), and the openings of the flue gas channels (32) of the baffle plates (31) on the two rows of baffle components (3) face oppositely.

2. The incinerator water-cooled wall according to claim 1, characterized in that: The number of the baffle units is one group, one end of the baffle plate (31) is connected to a position of the water cooling tube (1) close to the fin (2), and the other end of the baffle plate (31) extends to a mid-axis plane perpendicular to the water cooling tube (1) and the fin (2).

3. The incinerator water-cooled wall according to claim 2, characterized in that: On the projection of the symmetric plane of the two rows of baffle components (3), the two ends of each baffle plate (31) along the axial direction of the water cooling tube (1) will overlap with the ends of two staggered baffle plates (31) on the other row of baffle components (3).

4. The incinerator water-cooled wall according to claim 2, characterized in that: The baffle (31) is arc-shaped, and the arc-shaped concave surface faces the water cooling tube (1).

5. The incinerator water-cooled wall according to claim 1, characterized in that: A surfacing electrode (33) is provided at the connection between the baffle plate (31) and the water cooling tube (1), and the surfacing welding material is a nickel-based alloy.

6. The incinerator water-cooled wall according to claim 1 or 4, characterized in that: A reinforcing sheet (34) connected between the baffle sheet (31) and the water cooling tube (1) is provided in the smoke channel (32).

7. The incinerator water-cooled wall according to claim 6, characterized in that: Each of the baffle plates (31) is connected to two of the reinforcement plates (34), and the two reinforcement plates (34) are arranged on both sides of the baffle plate (31) along the axial direction of the water cooling tube (1).

8. The incinerator water-cooled wall according to claim 1, characterized in that: The surface of the fin (2) facing the flue gas is covered with a surfacing layer (35), and the welding material of the surfacing layer (35) is a nickel-based alloy.

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