Boiler ash purifying device
By adjusting the height of the ash spraying pipe and optimizing the structure of the air supply components, the problems of dust adhering to the walls of the fluidized bed furnace and the ash being sucked away were solved, thus achieving complete combustion of the ash and extending the lifespan of the fluidized bed furnace.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 李书军
- Filing Date
- 2025-07-03
- Publication Date
- 2026-06-26
AI Technical Summary
Dust tends to adhere to the walls of the fluidized bed furnace, which reduces the lifespan of the ash-burning device and makes the ash easily sucked away, posing a safety hazard.
A fluidized bed furnace ash burning device is designed. By adjusting the height of the ash spray pipe and the structure of the air supply component, the ash is ensured to form a combustion zone at the bottom of the fluidized bed. The air supply component is used to blow away the dust adhering to the inner wall of the furnace, thereby reducing dust adhesion.
It achieves complete combustion of purified ash, reduces the possibility of unburned purified ash being sucked away, reduces safety hazards, and extends the service life of the fluidized bed furnace.
Smart Images
Figure CN224415160U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fluidized bed combustion equipment technology, and in particular to a fluidized bed furnace ash purification device. Background Technology
[0002] The fluidized bed drying kiln is a highly efficient, energy-saving, and environmentally friendly thermal equipment. The fluidized bed furnace body consists of three parts: a combustion chamber, a secondary combustion chamber, and an air distribution chamber. The combustion chamber mainly comprises an air bed, air box, air cap, and slag discharge pipe. Carbon particles with a screened size ≤3mm are transported to the powder silo at the top of the furnace through a closed pipeline. A disc feeder evenly feeds the powder into the fluidized bed furnace, where it mixes with air ejected from the air cap orifices and bottom slag to form a fluidized bed. This generates the high-temperature flue gas required for drying the carbon material, typically controlled at 850℃-1100℃. The high-temperature flue gas then passes through the secondary combustion chamber and air distribution chamber, decreasing to 700℃, where it contacts the carbon material to evaporate and separate its moisture. Purified ash, used as a fuel for generating high-temperature flue gas in fluidized bed furnaces, mainly contains: phosphorus: 0.012%, sulfur: 0.78%, calcium: 20.82%, and fixed carbon: 45.9%. It is highly flammable in air. The ash spraying pipe extends horizontally into the fluidized bed furnace, forming a combustion zone in the upper part of the fluidized bed. During operation, it was found that the purified ash was not completely burned, and only a portion of it was burned. This is mainly because the ash is relatively light and located in the middle of the furnace. When the negative pressure generated by the kiln tail fan changes the direction of the high-temperature flue gas flow, the unburned purified ash is sucked into the dust collector. Due to its high flammability, it poses a safety hazard. At the same time, dust often adheres to the inner wall of the fluidized bed furnace during the combustion of pulverized coal, which reduces the lifespan of the fluidized bed furnace. Utility Model Content
[0003] The purpose of this utility model is to provide a fluidized bed furnace ash-burning device to solve the technical problems existing in the prior art, such as dust easily adhering to the walls of the fluidized bed furnace, reducing the lifespan of the ash-burning device, and the ash being easily sucked away. The various technical effects of the preferred solutions among the many technical solutions provided by this utility model are detailed below.
[0004] To achieve the above objectives, the present invention provides the following technical solution:
[0005] This utility model provides a fluidized bed furnace ash purification device, including a main body, a bellows, and an air supply assembly. A wind cap is mounted on the base of the main body, and a pulverized coal inlet pipe is mounted on the side wall of the main body. The air outlet of the bellows is connected to the base to supply air to the main body to disperse the incoming pulverized coal. An ash purification spray pipe is mounted on the main body, with its height lower than the pulverized coal inlet pipe and a distance of 600-700 mm from the base of the main body. The air supply assembly includes a first air supply pipe mounted on the side wall of the main body and a second air supply pipe mounted inside the main body. The outlet of the first air supply pipe is located on the inner wall of the main body via the side wall, so that the outlet of the first air supply pipe blows into the internal space of the main body. The outlet of the second air supply pipe blows into the inner wall of the main body. The first and second air supply pipes are connected by a tee, and the other end of the tee is used to connect to a blower.
[0006] Preferably, the first air supply duct includes a first main pipe and a plurality of first branch pipes. The first main pipe is disposed on the outside of the main body, the first branch pipes are installed on the side wall of the first main pipe, the first branch pipes pass through the side wall of the main body, and at least two first branch pipes are distributed along the height of the first main pipe.
[0007] Preferably, the second air supply duct includes a second main pipe and a plurality of second branch pipes. The second main pipe extends into the interior of the body through the base. The second branch pipes are installed on the side wall of the second main pipe and are arranged circumferentially along the side of the second main pipe, and a plurality of them are arranged along the height of the second main pipe.
[0008] Preferably, the second main pipe is disposed at a height of 3000-3200mm within the main body, the second branch pipe is disposed at a distance of 580-300mm from the bottom of the main body, and the distance between two adjacent second branch pipes is 750-850mm.
[0009] Preferably, the distance between the coal powder inlet pipe and the base at the main body is 200-2200 mm.
[0010] Preferably, the internal space of the lower middle part of the body is set in a cone shape.
[0011] Preferably, the main body is provided with a slag discharge port, which is located at the position of the base.
[0012] Preferably, the body also includes a partition, which forms an opening with the bottom or side of the body to allow gas to flow in an S-shape.
[0013] The technical solution provided in this application document has the following beneficial effects:
[0014] This utility model provides a fluidized bed furnace ash purification device, including a main body, a bellows, and an air supply assembly. A pulverized coal inlet pipe is provided on the side wall of the main body, and air caps are provided on the base at the bottom of the main body. The air outlet of the bellows is connected to the base to supply air to the main body and disperse the incoming pulverized coal. Due to the relatively thick side wall of the main body, the pulverized coal inlet pipe is inclined to facilitate the downward sliding of the pulverized coal under its own weight. Multiple air caps are provided on the base of the main body, evenly distributed to form a channel for air to enter the main body. The bellows are connected to the base, and the air supplied by the bellows is delivered into the main body through the air caps. Specifically… The wind cap is a connecting pipe with one end set as a closed section. Multiple outlets are evenly distributed on the side wall of the connecting pipe to reduce the probability of slag entering the wind box. To ensure complete combustion of the purified ash, the height of the purified ash spraying pipe is lower than the pulverized coal inlet pipe. Specifically, the distance between the purified ash spraying pipe and the base of the main body is 600-700 mm. In the fluidized bed furnace purified ash burning device, the bottom ash thickness ranges from 500-550 mm. When the pulverized coal is blown by the wind box, the height of the bottom of the fluidized bed layer is 600-70 mm from the bottom of the main body. Because the purified ash is relatively light, to reduce the probability of it being sucked away, the purified ash spraying pipe is installed inside the furnace... The installation height is 600-700mm, meaning the ash outlet of the ash spraying pipe is located at the lower part of the fluidized bed. This allows the ash to form a combustion zone at the bottom of the fluidized bed. Unburned ash moves upwards under negative pressure, passing through the middle and upper parts of the fluidized bed sequentially. After passing through these three zones, the ash is fully burned, the furnace slag volume is normal, and there is no unburned ash in the dust collector, effectively reducing ash discharge and preventing unburned ash from being drawn away by the dust collection system. Simultaneously, the air supply assembly includes a first air supply duct located outside the main body and a second air supply duct located inside the main body. The first air supply duct passes through the side wall of the main body and reaches the interior of the main body. The outlet of the first air supply duct is installed on the inner wall of the main body so that the outlet of the first air supply duct blows air into the interior space of the main body. The air from the outlet of the second air supply duct blows air into the inner wall of the main body. Specifically, the first air supply duct and the second air supply duct are connected by a T-junction, and the other end of the T-junction is used to connect to a blower. This ensures that the pressure inside the first air supply duct and the second air supply duct are the same. With this configuration, cold air is blown into the interior of the main body through the first air supply duct and cold air is blown into the side wall of the main body through the second air supply duct. This blows away the dust layer attached to the inner side wall of the main body and reduces the probability of dust adhering to the interior of the main body. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a sectional view of the main view of a fluidized bed furnace ash purification device provided in Embodiment 1 of this utility model.
[0017] Figure 2 This is a cross-sectional view of a fluidized bed furnace ash purification apparatus as shown in a side view according to an exemplary embodiment.
[0018] Figure 3 yes Figure 1 A magnified view of part A in the image.
[0019] In the diagram: 1. Main body; 11. Pulverized coal inlet pipe; 12. Purified ash spraying pipe; 13. Baffle plate; 14. Ash discharge port; 2. Base; 3. Air box; 4. Air cap; 5. Air supply assembly; 51. First main pipe; 52. First branch pipe; 53. Second main pipe; 54. Second branch pipe. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] This specific embodiment provides a fluidized bed furnace ash-burning device, which solves the technical problems in the prior art where dust easily adheres to the walls of the fluidized bed furnace, leading to a reduction in the lifespan of the fluidized bed furnace ash-burning device and the ash being easily sucked away.
[0022] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the following embodiments are not limited to those necessary for the solution of the utility model as described in the claims.
[0023] Reference Figures 1-3This utility model provides a fluidized bed ash purification device, including a main body 1, a wind box 3, and an air supply assembly 5. A pulverized coal inlet pipe 11 is provided on the side wall of the main body 1, and a wind cap 4 is provided on the base 2 at the bottom of the main body 1. The air outlet of the wind box 3 is connected to the base 2 to supply air to the main body 1 and disperse the incoming pulverized coal. Because the side wall of the main body is relatively thick, the pulverized coal inlet pipe 11 is inclined to facilitate the pulverized coal sliding downwards under its own weight. Multiple wind caps 4 are provided on the base 2 of the main body 1, evenly distributed to form a channel for air to enter the main body 1. The wind box 3 and the base 2 are connected... The air is connected to the base 2, and the air conveyed by the air box 3 is conveyed into the body 1 through the air cap 4. Specifically, the air cap 4 is a connecting pipe with one end set as closed. The side wall of the connecting pipe is evenly provided with multiple outlets, which can reduce the probability of slag entering the air box 3. In the existing technology, since a combustion zone is formed in the upper part of the boiling layer, the position of the ash spraying pipe 12 is relatively high. It was found during operation that the ash was not completely burned, and only part of the ash could be burned. This is mainly because the ash is relatively light and is located in the middle of the furnace. When the negative pressure generated by the kiln tail fan changes the direction of the high-temperature flue gas flow, the unburned ash is sucked into the dust collector. Because it is very easy to spontaneously combust, it poses a safety hazard. To ensure complete combustion of the purified ash, the height of the purified ash spraying pipe 12 is lower than that of the pulverized coal inlet pipe 11. Specifically, the distance between the purified ash spraying pipe 12 and the base 2 of the main body 1 is 600-700 mm. In the fluidized bed furnace, the bottom ash thickness ranges from 500-550 mm. When the pulverized coal is blown by the bellows, the height of the bottom of the fluidized bed layer is 500-750 mm from the bottom of the main body. Since the purified ash is relatively light, to reduce the chance of the purified ash being sucked away, the purified ash spraying pipe is installed at a height of 600-700 mm in the furnace. That is, the ash outlet of the purified ash spraying pipe is set at the lower part of the fluidized bed layer, so that the purified ash forms a combustion zone at the bottom of the fluidized bed layer. During the upward movement of the unburned purified ash under negative pressure, it passes through the middle and upper parts of the fluidized bed layer in sequence. After passing through these three areas, the purified ash can be fully burned, the amount of slag in the furnace is normal, and there is no unburned purified ash in the dust collector, reducing safety hazards.
[0024] Secondly, in order to reduce dust adhesion inside the body 1, the air supply assembly 5 includes a first air supply pipe disposed outside the body 1 and a second air supply pipe disposed inside the body 1. The first air supply pipe passes through the side wall of the body 1 to reach the interior of the body 1, and the outlet of the first air supply pipe is installed on the inner wall of the body 1 so that the outlet of the first air supply pipe blows into the interior space of the body 1, and the air from the outlet of the second air supply pipe blows into the inner wall of the body 1. Specifically, the first air supply pipe and the second air supply pipe are connected by a T-junction, and the other end of the T-junction is used to connect to a blower. This ensures that the pressure inside the first air supply pipe and the second air supply pipe is the same. With this configuration, cold air is blown into the interior of the body 1 through the first air supply pipe and cold air is blown into the side wall of the body 1 through the second air supply pipe, which disperses the dust layer adhering to the inner side wall of the body 1 and reduces the probability of dust adhering inside the body 1.
[0025] Further optimizing the design, the first air supply duct includes a first main pipe 51 and multiple first branch pipes 52. The first main pipe 51 is located on the outside of the main body 1, and the first branch pipes 52 are installed on the side wall of the first main pipe 51, passing through the side wall of the main body 1. At least two first branch pipes 52 are distributed along the height of the first main pipe 51. Thus, the outlets of the multiple first branch pipes 51 on the side wall of the main body 1 are distributed along the height direction of the main body 1. Figure 2 It is known that multiple first main pipes 51 are provided along the periphery of the body 1, so that the outlets of the first branch pipes 52 are provided on at least two sides of the body 1, thereby reducing the adhesion of dust and extending the service life of the body 1.
[0026] Further optimization of the scheme: the second air supply duct includes a second main pipe 53 and multiple second branch pipes 54. The second main pipe 53 extends into the interior of the body 1 through the base 2. The second branch pipes 54 are installed on the side wall of the second main pipe 53 and are arranged circumferentially along the side of the second main pipe 53. Multiple branch pipes are also arranged along the height of the second main pipe 53.
[0027] The second main pipe 53 is installed at a height of 3000-3200mm inside the main body 1, and the second branch pipe 54 is installed at a distance of 1580-3100mm from the bottom of the main body 1. The distance between two adjacent second branch pipes 54 is 750-850mm. In order to ensure wind pressure balance, the first branch pipe 52 is installed at the same height as the second branch pipe 54.
[0028] In addition, in order to ensure that the pressure inside the first main pipe 51 and the second main pipe 53 is equal, an equalization box is installed between the first air supply pipe and the second air supply pipe.
[0029] The scheme is further optimized so that the distance between the coal powder inlet pipe 11 and the base 2 at the main body 1 is 2100-2200 mm, which makes it convenient for the coal powder to be dispersed when falling, and to form a boiling layer under the action of the bellows.
[0030] To further optimize the design, the internal space in the lower middle part of the main body 1 is set into a cone shape to facilitate slag collection.
[0031] The main body 1 is provided with a slag discharge port, which is located at the base 2.
[0032] To further optimize the design, in order to facilitate gas flow and reduce dust from following the gas flow, the main body 1 also has a baffle 13. The baffle 13 and the bottom or side of the main body 1 form an opening for gas flow, so that the gas layer flows in an S-shape.
[0033] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., used herein to indicate the orientation or positional relationship shown in the accompanying drawings, are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
[0036] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments. The multiple solutions provided in this application contain their own basic solutions, are independent of each other, and do not restrict each other, but they can also be combined with each other without conflict to achieve multiple effects.
[0037] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A fluidized bed furnace ash purification device, characterized in that, The system includes a main body (1), a bellows (3), and an air supply assembly (5). A wind cap (4) is mounted on the base (2) of the main body (1). A pulverized coal inlet pipe (11) is mounted on the side wall of the main body (1). The air outlet of the bellows (3) is connected to the base (2) to supply air to the main body (1) to disperse the incoming pulverized coal. A purifying ash spray pipe (12) is mounted on the main body (1). The height of the purifying ash spray pipe (12) is lower than that of the pulverized coal inlet pipe (11), and the purifying ash spray pipe (12) is located at a distance from the base of the main body (1). 2) The distance is 600-700 mm. The air supply assembly (5) includes a first air supply pipe disposed on the side wall of the main body (1) and a second air supply pipe disposed inside the main body (1). The outlet of the first air supply pipe is disposed on the inner wall of the main body (1) through the side wall of the main body (1) so that the outlet of the first air supply pipe blows towards the internal space of the main body (1), and the air from the outlet of the second air supply pipe blows towards the inner wall of the main body (1). The first air supply pipe and the second air supply pipe are connected by a tee, and the other end of the tee is used to connect to the blower.
2. The fluidized bed furnace ash purification device according to claim 1, characterized in that, The first air supply duct includes a first main pipe (51) and a plurality of first branch pipes (52). The first main pipe (51) is located on the outside of the body (1). The first branch pipes (52) are installed on the side wall of the first main pipe (51). The first branch pipes (52) pass through the side wall of the body (1), and at least two of the first branch pipes (52) are distributed along the height of the first main pipe (51).
3. The fluidized bed furnace ash purification device according to claim 1, characterized in that, The second air supply pipe includes a second main pipe (53) and a plurality of second branch pipes (54). The second main pipe (53) extends into the interior of the body (1) through the base (2). The second branch pipes (54) are installed on the side wall of the second main pipe (53) and are arranged circumferentially along the side of the second main pipe (53). At the same time, a plurality of them are arranged along the height of the second main pipe (53).
4. The fluidized bed furnace ash purification device according to claim 3, characterized in that, The second main pipe (53) is installed at a height of 3000-3200mm inside the main body (1), the second branch pipe (54) is installed at a distance of 1580-3100mm from the bottom of the main body (1), and the distance between two adjacent second branch pipes (54) is 750-850mm.
5. The fluidized bed furnace ash purification device according to claim 1, characterized in that, The distance between the coal powder inlet pipe (11) and the base (2) at the main body (1) is 2100-2200 mm.
6. The fluidized bed furnace ash purification device according to claim 1, characterized in that, The lower middle part of the body (1) has a conical internal space.
7. The fluidized bed furnace ash purification device according to claim 1, characterized in that, The main body (1) is provided with a slag discharge port, which is located at the position of the base (2).
8. The fluidized bed furnace ash purification device according to claim 1, characterized in that, The body (1) also has a partition (13) inside, and the partition (13) forms an opening with the bottom or side of the body (1) to allow gas to flow in an S-shape.