Slag tapping hole hood of circulating fluidized bed boiler

Abstract

The utility model discloses a blast cap for a slag tapping hole of a circulating fluidized bed boiler, which relates to the technical field of boiler blast caps and comprises a blast cap component, a blast cap air outlet component is arranged at the bottom of the blast cap component, the bottom of the outer wall of the blast cap component penetrates into the blast cap air outlet component, a blast cap base is arranged at the bottom of the blast cap air outlet component, and the blast cap air outlet component is arranged on the blast cap base. The outer wall of the bottom of the air cap air outlet assembly penetrates into the air cap base, and an air cap filter screen assembly is arranged in the air cap base and close to the lower side of the bottom of the air cap air outlet assembly. According to the wind cap, the threads on the connecting pipe in the wind cap air outlet assembly are in threaded connection with the thread groove in the fixed sleeve on the wind cap base, and after the wind cap is used for a period of time, the wind cap air outlet assembly is rotated outwards, so that the wind cap air outlet assembly and the wind cap base are disassembled, and the wind cap is convenient to assemble and disassemble. And therefore, the air cap filter screen assembly is taken out from the interior of the air cap base to be cleaned and replaced, and the air cap filter screen assembly of the air cap can be detached and replaced conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler air caps, in particular to an air cap for a slag outlet of a circulating fluidized bed boiler. Background Art

[0002] Circulating fluidized bed boilers have the advantages of wide fuel adaptability, high desulfurization efficiency in the furnace, low nitrogen oxide emissions, high combustion efficiency, large load adjustment ratio and comprehensive utilization of ash and slag. They are widely used in power station boilers, industrial boilers and other fields. Circulating fluidized bed (CFB) boilers are rapidly developing in the direction of large-scale, high-parameterization and supercriticality. With the continuous increase in boiler capacity, the uniformity of air distribution on the air distribution plate becomes more important. The key difference between circulating fluidized bed boilers and other boilers is the fluidized combustion of bed materials. The primary air passes through the air cap above the air distribution plate to form a jet, so that the bed material is fluidized and ensures sufficient mixing of gas and solid phases. It not only prolongs the residence time of the bed material in the furnace, but also strengthens the heat exchange between the gas and solid phases. The air cap is the key to ensuring that the bed material is uniformly fluidized. The boiler air cap is responsible for evenly conveying the wind to the furnace bed material layer to meet the air required for boiler combustion and control the amount of air supply so that the furnace bed material layer always maintains a fluidized boiling state and the coal is burned thoroughly. The following problems exist in the existing technology:

[0003] The existing circulating fluidized bed boiler slag outlet hood is prone to slag leakage during operation due to the scouring of high-temperature circulating materials. The external and internal components of the hood are also severely worn. Since the hood seat in the hood is firmly fixed to the fluidized bed, it is inconvenient to replace the filter. Secondly, when the hood is not in use, the residue produced after coal combustion is easy to leak through the air outlet, which makes it easy to get blocked. Utility Model Content

[0004] The utility model provides a slag outlet hood for a circulating fluidized bed boiler to solve the problems existing in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A slag outlet hood for a circulating fluidized bed boiler comprises a hood assembly, a hood air outlet assembly is arranged at the bottom of the hood assembly, and the bottom of the outer wall of the hood assembly penetrates into the interior of the hood air outlet assembly, a hood base is arranged at the bottom of the hood air outlet assembly, the outer wall of the bottom of the hood air outlet assembly penetrates into the interior of the hood base, and a hood filter group is arranged inside the hood base near the bottom lower side of the hood air outlet assembly.

[0007] A further improvement of the technical solution of the utility model is that the hood air outlet assembly includes an air outlet pipe 1, an air outlet pipe 2 and a connecting pipe, the upper and lower sides of the outer wall of the air outlet pipe 1 are respectively provided with a plurality of air outlet 1s that are connected inside and outside in a circular array, the outer wall of the air outlet pipe 2 is provided with a plurality of air outlet 2s that are connected inside and outside with the air outlet 1 in a circular array, and the bottom of the outer wall of the connecting pipe is provided with a thread.

[0008] A further improvement of the technical solution of the utility model is that: the three upper and lower air outlets 1 and 2 are arranged on the same vertical line, and the inner diameter of the air outlet 1 is smaller than the inner diameter of the air outlet 2.

[0009] A further improvement of the technical solution of the utility model is that: a fixed sleeve is fixedly connected to the top of the hood base, a threaded groove is provided on the inner wall of the fixed sleeve, the inner wall of the threaded groove is threadedly connected to the outer wall of the thread, a magnetic ring is fixedly connected to the inner wall of the hood base near the fixed sleeve, and a clamping groove is provided on the top of the magnetic ring.

[0010] A further improvement of the technical solution of the utility model is that the hood filter assembly includes a filter plate, the bottom of the filter plate is fixedly connected to an iron ring, the outer wall of the iron ring is magnetically connected to the inner wall of the slot, and the top outer wall of the filter plate is fixedly connected to four L-shaped blocks in a circular array.

[0011] A further improvement of the technical solution of the utility model lies in that: the hood assembly includes an umbrella-shaped column, the bottom of the umbrella-shaped column is fixedly connected to a connecting tube, and the upper and lower sides of the top of the outer wall of the connecting tube are provided with two connecting holes whose number is the same as the first air outlet and which penetrate inside and outside in an annular array, and the bottom of the outer wall of the connecting tube is provided with one connecting hole whose number is the same as the second air outlet and which penetrate inside and outside in an annular array, the bottom of the umbrella-shaped column is provided with one arc-shaped slider on the left and right sides close to the connecting tube, and the left and right sides of the bottom of the outer wall of the connecting tube are provided with two arc-shaped sliders.

[0012] A further improvement of the technical solution of the utility model is that: the two arc-shaped sliders 1 are arranged in a mirror image, the two arc-shaped sliders 2 are arranged in a mirror image, the inner diameter of the connecting hole 2 is the same as the inner diameter of the air outlet 1 and they are interconnected, the inner diameter of the connecting hole 1 is the same as the inner diameter of the air outlet 2 and they are interconnected, and the outer wall of the connecting tube overlaps the inner walls of the air outlet pipe 1 and the air outlet pipe 2.

[0013] A further improvement of the technical solution of the utility model lies in that: a limiting groove 1 is provided on the side of the top of the air outlet duct 1 close to the arc-shaped slider 1, and a limiting groove 2 is provided on the side of the inner wall of the air outlet duct 2 close to the arc-shaped slider 2. The two limiting grooves 2 are arranged in a mirror image, and the outer wall of the arc-shaped slider 1 is slidably connected to the inner wall of the limiting groove 1. The arc-shaped slider 1 on the right side is arranged at the front side of the right limiting groove 1, and the arc-shaped slider 1 on the left side is arranged at the rear side of the left limiting groove 1. The outer wall of the arc-shaped slider 2 is slidably connected to the inner wall of the limiting groove 2. The arc-shaped slider 2 on the right side is arranged at the front side of the right limiting groove 2, and the arc-shaped slider 2 on the left side is arranged at the rear side of the left limiting groove 2.

[0014] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0015] 1. The utility model provides a hood for a slag outlet of a circulating fluidized bed boiler, which adopts the cooperation among a hood air outlet assembly, a hood base and a hood filter assembly, and is threadedly connected with a threaded groove in a fixed sleeve on the hood base through a thread on a connecting pipe in the hood air outlet assembly. After the hood has been used for a period of time, the hood air outlet assembly and the hood base are disassembled by rotating the hood air outlet assembly outward, so that the hood filter assembly can be taken out from the inside of the hood base for cleaning and replacement, thereby solving the problem that the existing hood for a slag outlet of a circulating fluidized bed boiler is prone to slag leakage due to the scouring of high-temperature circulating materials during operation, and the external and internal components of the hood are also severely worn. Since the hood seat in the hood is firmly fixed to the fluidized bed, it is inconvenient to replace the filter, and the beneficial effect of facilitating the disassembly and replacement of the hood filter assembly of the hood is achieved.

[0016] 2. The utility model provides a slag outlet hood for a circulating fluidized bed boiler, which adopts the cooperation between the hood assembly and the hood air outlet assembly. When air is discharged, the connecting tube on the hood assembly is rotated to rotate the umbrella-shaped column along the inside of the hood air outlet assembly, and the connecting hole 1 and the connecting hole 2 on the hood assembly are connected and aligned with the air outlet 1 and the air outlet 2 on the hood air outlet assembly, so that the wind force inside the boiler and the high-temperature circulating materials can be discharged smoothly. When air is not discharged, the connecting tube on the hood assembly is rotated back to rotate the connecting hole 1 and the connecting hole 2 on the hood assembly to between the air outlet 1 and the air outlet 2, so that the air outlet 1 and the air outlet 2 are closed to avoid slag leakage. This solves the problem that when the hood is not in use, the residue produced after the combustion of coal is easy to leak through the air outlet, resulting in blockage, and achieves the beneficial effect of effectively avoiding slag leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the slag outlet air cap of the circulating fluidized bed boiler of the utility model;

[0018] Figure 2 It is a schematic diagram of the disassembled three-dimensional structure of the slag outlet hood of a circulating fluidized bed boiler of the utility model;

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the hood filter assembly of the utility model;

[0020] Figure 4 The utility model is a schematic diagram of the disassembly of the three-dimensional structure of the hood assembly and the hood air outlet assembly;

[0021] Figure 5 It is a partial cross-sectional schematic diagram of the three-dimensional structure of the hood air outlet assembly of the utility model.

[0022] In the figure: 1. hood assembly; 11. umbrella-shaped column; 12. connecting tube; 13. connecting hole 1; 14. connecting hole 2; 15. arc-shaped slider 1; 16. arc-shaped slider 2; 2. hood air outlet assembly; 21. air outlet pipe 1; 210. air outlet 1; 211. limiting slide groove 1; 22. air outlet pipe 2; 220. air outlet 2; 221. limiting slide groove 2; 23. connecting pipe; 24. thread; 3. hood base; 31. fixing sleeve; 32. thread groove; 33. magnetic ring; 330. card slot; 4. hood filter assembly; 41. filter plate; 42. iron ring; 43. L-shaped card block. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods:

[0024] like Figure 1 As shown, the utility model provides a slag outlet hood for a circulating fluidized bed boiler, comprising a hood assembly 1, a hood outlet assembly 2 is arranged at the bottom of the hood assembly 1, and the bottom of the outer wall of the hood assembly 1 penetrates into the interior of the hood outlet assembly 2, a hood base 3 is arranged at the bottom of the hood outlet assembly 2, the bottom outer wall of the hood outlet assembly 2 penetrates into the interior of the hood base 3, and a hood filter assembly 4 is arranged near the bottom lower side of the hood outlet assembly 2 inside the hood base 3;

[0025] A hood assembly 1, a hood air outlet assembly 2, a hood base 3 and a hood filter assembly 4 are provided. The cooperation between the hood air outlet assembly 2 and the hood base 3 facilitates the disassembly and installation of the hood air outlet assembly 2 and the hood base 3, and also facilitates the cleaning and replacement of the hood filter assembly 4. By operating the hood assembly 1, the air outlet in the hood can be opened and closed, thereby improving the air outlet efficiency and avoiding the leakage of slag when no air is emitted.

[0026] like Figure 2As shown, the utility model provides a technical solution for the slag outlet hood of a circulating fluidized bed boiler: the hood air outlet assembly 2 includes an air outlet pipe 1 21, an air outlet pipe 22 and a connecting pipe 23, the upper and lower sides of the outer wall of the air outlet pipe 1 21 are respectively provided with a plurality of air outlets 1 210 that are connected inside and outside in a circular array, the outer wall of the air outlet pipe 22 is provided with a plurality of air outlets 220 that are connected inside and outside with the air outlet 1 210 in a circular array, the outer wall bottom of the connecting pipe 23 is provided with a thread 24, the upper and lower three air outlets 1 210 and the air outlet 2 220 are arranged on the same vertical line, and by arranging the air outlet 1 210 and The air outlet 220 improves the air outlet efficiency of the hood. The inner diameter of the air outlet 1 210 is smaller than the inner diameter of the air outlet 220. The top of the hood base 3 is fixedly connected with a fixed sleeve 31. The inner wall of the fixed sleeve 31 is provided with a threaded groove 32. The inner wall of the threaded groove 32 is threadedly connected with the outer wall of the thread 24. The inner part of the fixed sleeve 31 is screwed together with the outer wall of the connecting pipe 23 to facilitate the installation and disassembly of the hood air outlet assembly 2 and the hood base 3. The hood base 3 is fixedly connected with a magnetic ring 33 near the inner wall of the fixed sleeve 31. The top of the magnetic ring 33 is provided with a slot 330.

[0027] like Figure 3 As shown, the utility model provides a technical solution for the slag outlet hood of a circulating fluidized bed boiler: the hood filter assembly 4 includes a filter plate 41, the bottom of the filter plate 41 is fixedly connected with an iron ring 42, the outer wall of the iron ring 42 is magnetically connected to the inner wall of the slot 330, and the top outer wall of the filter plate 41 is fixedly connected with four L-shaped blocks 43 in an annular array, which are engaged in the slot 330 through the iron ring 42. The filter plate 41 is magnetically attracted to the magnetic ring 33, which is convenient for replacing and cleaning the filter plate 41.

[0028] like Figure 4As shown, the utility model provides a technical solution for the slag outlet hood of a circulating fluidized bed boiler: the hood assembly 1 includes an umbrella-shaped column 11, the bottom of the umbrella-shaped column 11 is fixedly connected to a connecting tube 12, the upper and lower sides of the top of the outer wall of the connecting tube 12 are provided with connecting holes 14 of the same number as the air outlet 1 210 and through the inside and outside, the outer wall bottom of the connecting tube 12 is provided with connecting holes 13 of the same number as the air outlet 220 and through the inside and outside, the bottom of the umbrella-shaped column 11 is provided with arc-shaped sliders 15 on the left and right sides near the connecting tube 12, and the left and right sides of the bottom of the outer wall of the connecting tube 12 are respectively provided with arc-shaped sliders 15. An arc-shaped slider 2 16 is provided, the two arc-shaped sliders 15 are mirror-imaged, the two arc-shaped sliders 2 16 are mirror-imaged, the inner diameter of the connecting hole 2 14 is the same as the inner diameter of the air outlet 1 210 and they are interconnected, the inner diameter of the connecting hole 13 is the same as the inner diameter of the air outlet 2 220 and they are interconnected, the outer wall of the connecting tube 12 overlaps the inner wall of the air outlet pipe 1 21 and the air outlet pipe 2 22, and the connecting hole 13 and the connecting hole 2 14 on the connecting tube 12 are interconnected with the air outlet 1 210 and the air outlet 2 220 on the air outlet pipe 1 21 and the air outlet pipe 2 22, thereby adjusting the air outlet of the hood.

[0029] like Figure 5 As shown, the utility model provides a technical solution for the slag outlet hood of a circulating fluidized bed boiler: a limiting chute 211 is provided on the top of an air outlet pipe 21 near a side of an arc-shaped slider 15, and a limiting chute 221 is provided on the inner wall of an air outlet pipe 22 near a side of an arc-shaped slider 16, the two limiting chute 221 are mirror-imaged, the outer wall of the arc-shaped slider 15 is slidably connected to the inner wall of the limiting chute 211, the right arc-shaped slider 15 is arranged at the front side of the right limiting chute 211, and the left arc-shaped slider One 15 is arranged at the rear side of the left side limiting slide groove one 211, the outer wall of the arc-shaped slider two 16 is slidably connected with the inner wall of the limiting slide groove two 221, the right side arc-shaped slider two 16 is arranged at the front side of the right side limiting slide groove two 221, and the left side arc-shaped slider two 16 is arranged at the rear side of the left side limiting slide groove two 221, and the arc-shaped slider one 15 and the arc-shaped slider two 16 slide along the limiting slide groove one 211 and the limiting slide groove two 221 respectively, thereby driving the connecting tube 12 to rotate to open and close the air outlet in the hood.

[0030] The working principle of the slag outlet air cap of the circulating fluidized bed boiler is described in detail below.

[0031] like Figure 1-5As shown, when in use, first, the filter plate 41 is engaged into the card slot 330 through the iron ring 42, so that the filter plate 41 is magnetically fixed on the magnetic ring 33, and then the threaded groove 32 inside the fixing sleeve 31 is screwed and connected with the thread 24 on the outer wall of the connecting pipe 23, so that the hood air outlet assembly 2 and the hood base 3 are connected and fixed. After the hood has been used for a period of time, the hood air outlet assembly 2 and the hood base 3 are separated by turning away the hood base 3, and the filter plate 41 is taken out through the L-shaped card block 43 on the filter plate 41, so that the filter plate 41 is easy to clean and replace. When the boiler is working, the umbrella-shaped column 11 rotates the connecting cylinder 12 so that the arc-shaped slider 11 is rotated. 5 and the arc-shaped slider 2 16 slide along the limiting slide groove 1 211 and the limiting slide groove 2 221 respectively, and align the connecting hole 13 and the connecting hole 2 14 on the connecting tube 12 with the air outlet 1 210 and the air outlet 2 220, so that air can be discharged through the air outlet 1 210 and the air outlet 2 220 at the same time, thereby improving the air outlet efficiency and allowing the wind force inside the boiler and the high-temperature circulating materials to be discharged smoothly. When no air is discharged, by rotating the connecting tube 12 back, the connecting hole 13 and the connecting hole 2 14 on the hood assembly 1 are rotated to the middle of the air outlet 1 210 and the air outlet 2 220, and the air outlet 1 210 and the air outlet 2 220 are closed to avoid slag leakage.

[0032] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A slag outlet hood for a circulating fluidized bed boiler, comprising a hood assembly (1), characterized in that: A hood outlet assembly (2) is arranged at the bottom of the hood assembly (1), and the bottom of the outer wall of the hood assembly (1) penetrates into the interior of the hood outlet assembly (2), a hood base (3) is arranged at the bottom of the hood outlet assembly (2), the bottom outer wall of the hood outlet assembly (2) penetrates into the interior of the hood base (3), and a hood filter assembly (4) is arranged inside the hood base (3) near the bottom lower side of the hood outlet assembly (2).

2. The slag outlet hood for a circulating fluidized bed boiler according to claim 1, characterized in that: The hood air outlet assembly (2) comprises an air outlet pipe 1 (21), an air outlet pipe 2 (22) and a connecting pipe (23); the upper and lower sides of the outer wall of the air outlet pipe 1 (21) are respectively provided with a plurality of air outlet 1s (210) which are connected inside and outside in a circular array; the outer wall of the air outlet pipe 2 (22) is provided with a plurality of air outlet 2s (220) which are connected inside and outside with the air outlet 1 (210); and the bottom of the outer wall of the connecting pipe (23) is provided with a thread (24).

3. The slag outlet hood for a circulating fluidized bed boiler according to claim 2, characterized in that: The three upper and lower air outlets 1 (210) and 2 (220) are arranged on the same vertical line, and the inner diameter of the air outlet 1 (210) is smaller than the inner diameter of the air outlet 2 (220).

4. The slag outlet hood for a circulating fluidized bed boiler according to claim 3, characterized in that: The top of the hood base (3) is fixedly connected to a fixed sleeve (31), the inner wall of the fixed sleeve (31) is provided with a thread groove (32), the inner wall of the thread groove (32) is threadedly connected to the outer wall of the thread (24), the hood base (3) is fixedly connected to the inner wall of the fixed sleeve (31) near the magnetic ring (33), and the top of the magnetic ring (33) is provided with a slot (330).

5. The slag outlet hood for a circulating fluidized bed boiler according to claim 1, characterized in that: The hood filter assembly (4) comprises a filter plate (41), the bottom of the filter plate (41) is fixedly connected to an iron ring (42), the outer wall of the iron ring (42) is magnetically connected to the inner wall of the slot (330), and the top outer wall of the filter plate (41) is fixedly connected to four L-shaped blocks (43) in an annular array.

6. The slag outlet hood for a circulating fluidized bed boiler according to claim 1, characterized in that: The hood assembly (1) comprises an umbrella-shaped column (11), the bottom of the umbrella-shaped column (11) is fixedly connected to a connecting tube (12), the upper and lower sides of the top of the outer wall of the connecting tube (12) are provided with connecting holes (14) of the same number as the first air outlet (210) and penetrating inside and outside in an annular array, the bottom of the outer wall of the connecting tube (12) is provided with connecting holes (13) of the same number as the second air outlet (220) and penetrating inside and outside in an annular array, the bottom of the umbrella-shaped column (11) is provided with arc-shaped sliders (15) on the left and right sides near the connecting tube (12), and the left and right sides of the bottom of the outer wall of the connecting tube (12) are provided with arc-shaped sliders (16) on the left and right sides.

7. The slag outlet hood for a circulating fluidized bed boiler according to claim 6, characterized in that: The two arc-shaped sliders 1 (15) are arranged in a mirror image, the two arc-shaped sliders 2 (16) are arranged in a mirror image, the inner diameter of the connecting hole 2 (14) is the same as the inner diameter of the air outlet 1 (210) and they are interconnected, the inner diameter of the connecting hole 1 (13) is the same as the inner diameter of the air outlet 2 (220) and they are interconnected, and the outer wall of the connecting tube (12) overlaps the inner wall of the air outlet pipe 1 (21) and the air outlet pipe 2 (22).

8. The slag outlet hood for a circulating fluidized bed boiler according to claim 7, characterized in that: A limiting slide groove 1 (211) is provided at the top of the air outlet pipe 1 (21) on a side close to the arc-shaped slider 1 (15), and a limiting slide groove 2 (221) is provided at the inner wall of the air outlet pipe 2 (22) on a side close to the arc-shaped slider 2 (16). The two limiting slide grooves 2 (221) are arranged in a mirror image. The outer wall of the arc-shaped slider 1 (15) is slidably connected to the inner wall of the limiting slide groove 1 (211). The right arc-shaped slider 1 (15) is arranged at the front side of the right limiting slide groove 1 (211), and the left arc-shaped slider 1 (15) is arranged at the rear side of the left limiting slide groove 1 (211). The outer wall of the arc-shaped slider 2 (16) is slidably connected to the inner wall of the limiting slide groove 2 (221). The right arc-shaped slider 2 (16) is arranged at the front side of the right limiting slide groove 2 (221), and the left arc-shaped slider 2 (16) is arranged at the rear side of the left limiting slide groove 2 (221).

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