A CFB boiler flue outlet ash cleaning device

Abstract

This utility model relates to a CFB boiler flue outlet ash cleaning device, belonging to the field of circulating fluidized bed technology. The device includes a CFB boiler assembly, which includes a horizontal flue. A cleaning component extending to the outside of the horizontal flue is slidably sealed at the inner bottom of the horizontal flue. This utility model achieves ash cleaning inside the horizontal flue through a connecting structure design between the extraction component and the cleaning component. Furthermore, this design facilitates the storage of the cleaning component. Compared to traditional fixed installation structures, this retractable design protects the internal air vents of the air cap, effectively preventing dust adhesion and blockage, thus extending its service life. Simultaneously, the threaded connection design of the fixing ring and sealing sleeve allows for the disassembly and replacement of individual air caps, ensuring efficient and streamlined disassembly and replacement procedures for operators.

Description

Technical Field

[0001] This utility model belongs to the field of circulating fluidized bed technology, specifically relating to a CFB boiler flue outlet ash cleaning device. Background Technology

[0002] CFB boilers, or circulating fluidized bed boilers, have high fly ash concentrations in the flue gas at the furnace outlet during operation. As the boiler operates, ash easily accumulates in the horizontal flue at the furnace outlet, especially during boiler load reduction. When the flue gas flow rate and velocity decrease, a large amount of ash particles are deposited in the horizontal flue. This ash accumulation reduces the flow area of ​​the horizontal flue at the furnace outlet, increases the flue gas velocity, and affects the separation efficiency of the cyclone separator. Therefore, it is necessary to design an ash cleaning device for the flue outlet of a CFB boiler.

[0003] For example, announcement number CN222527677U, entitled "A Soot Removal Device for the Horizontal Flue at the Furnace Outlet of a Circulating Fluidized Bed Boiler," includes a furnace, a horizontal flue, a cyclone separator, a high-temperature superheater, a low-temperature superheater, and an economizer. It also includes a soot removal device, with one end positioned at the bottom of the horizontal flue and the other end at the lower end of the economizer. The soot removal device includes a primary air preheater, a conveying duct, a conveying branch duct, and a soot removal module. The soot removal module is located at the bottom inside the horizontal flue and includes a main duct, branch ducts, a connecting rod, and a small air cap. This utility model removes a small portion of the soot through a bypass pipe of the primary air preheater. The primary air is drawn to the bottom of the horizontal flue at the furnace outlet and enters the ash removal device. The small air cap loosens and fluidizes the accumulated ash in the horizontal flue at the furnace outlet, and then enters the cyclone separator with the flue gas to achieve the purpose of cleaning the ash accumulation in the horizontal flue at the furnace outlet. However, the existing technology of the ash removal module's small air cap is installed in a fixed position at the bottom of the horizontal flue. This fixed method causes the ash to adhere to the outside of the small air cap during the later ash guiding work of the horizontal flue, causing blockage at the air hole position, affecting the later exhaust efficiency, and it is also inconvenient to disassemble and replace the small air cap separately later. Utility Model Content

[0004] The purpose of this utility model is to provide a simple and reasonably designed ash cleaning device for the flue outlet of a CFB boiler in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A CFB boiler flue outlet ash cleaning device includes a CFB boiler assembly, the CFB boiler assembly includes a horizontal flue, the bottom of the horizontal flue is sealed and slidably sealed with an ash cleaning component extending to the outside therefrom, and the bottom of the ash cleaning component is fixedly connected to an exhaust component that communicates with the inside of the CFB boiler assembly.

[0007] As a further optimization of this utility model, the CFB boiler assembly also includes a boiler, the horizontal flue is fixedly connected to one side of the top of the boiler, the other side of the horizontal flue is fixedly connected to a cyclone dust collector, and the bottom of the cyclone dust collector is fixedly connected to the bottom of the boiler. The top of the cyclone dust collector is fixedly connected to a connecting flue, and the bottom of the connecting flue is fixedly connected to an installation chamber.

[0008] As a further optimization of this utility model, the dust removal assembly includes multiple fixing rings fixedly installed at the bottom of the horizontal flue, with sealing sleeves threaded onto the outer sides of the multiple fixing rings, and a connecting main pipe slidably sealingly passing through the bottom of each of the multiple sealing sleeves. A wind cap placed inside the horizontal flue is threaded onto the outer side of each of the multiple connecting main pipes, and multiple air holes are opened on the outer side of each of the multiple wind caps.

[0009] As a further optimization of this utility model, the bottom of the multiple main connecting pipes is fixedly connected to three branch pipes, the bottom of the three branch pipes is fixedly connected to a main connecting pipe, and a fixing block is fixedly installed on the bottom of the boiler and the cyclone dust collector on the side closest to each other. An electric push rod is fixedly installed on the top of each of the two fixing blocks, and the output end of the top of the two electric push rods is connected to the bottom of the three branch pipes.

[0010] As a further optimization of this utility model, the air extraction assembly includes an air pump fixedly connected to the bottom of one side of the installation chamber. A connecting air pipe is fixedly installed at the top output end of the air pump and placed below the connecting main pipe. A control valve is fixedly connected to the top of the connecting air pipe, and a connecting hose is fixedly connected to the top of the control valve. The top of the connecting hose is fixedly connected to the bottom of the connecting main pipe.

[0011] As a further optimization of this utility model, a fixing ring is fixedly installed on the top of the boiler, the cyclone dust collector and the outside of the installation chamber, and a support frame is fixedly installed at both ends of the fixing ring.

[0012] The beneficial effects of this utility model are as follows: This utility model, through the interconnected structure design of the air extraction component and the dust removal component, can realize the cleaning of ash accumulation inside the horizontal flue. Moreover, the design of this mechanism can also facilitate the storage of the dust removal component. Compared with the traditional fixed installation structure design, this storage method can protect the air holes inside the air cap, effectively preventing dust from adhering and causing blockage of the air holes, thereby extending its service life. At the same time, with the threaded connection design of the fixing collar and sealing sleeve, it is also possible to disassemble and replace the individual air cap, ensuring the efficiency and steps of disassembly and replacement for operators. Attached Figure Description

[0013] Figure 1 This is a front view of the overall structure of this utility model;

[0014] Figure 2 This is a rear view of the overall structure of this utility model;

[0015] Figure 3 This is a cross-sectional view of the overall structure of this utility model;

[0016] Figure 4 This is a three-dimensional structural diagram of the dust removal component of this utility model. Figure 1 ;

[0017] Figure 5 This is a three-dimensional structural diagram of the dust removal component of this utility model. Figure 2 ;

[0018] Figure 6 This is a three-dimensional structural exploded view of the dust removal component of this utility model;

[0019] Figure 7 This is a utility model Figure 3 Enlarged view of point A in the middle.

[0020] In the diagram: 1. CFB boiler assembly; 100. Boiler; 101. Horizontal flue; 102. Cyclone dust collector; 103. Installation compartment; 104. Connecting flue; 2. Ash removal assembly; 200. Fixing block; 201. Electric push rod; 202. Connecting branch pipe; 203. Connecting main pipe; 204. Sealing sleeve; 205. Air vent; 206. Air cap; 207. Fixing collar; 208. Connecting main pipe; 3. Air extraction assembly; 300. Air pump; 301. Connecting air pipe; 302. Control valve; 303. Connecting hose. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example 1

[0023] like Figure 1 , Figure 2 , Figure 3As shown, a CFB boiler flue outlet ash cleaning device includes a CFB boiler assembly 1, which includes a boiler 100. A horizontal flue 101 is fixedly connected to one side of the top of the boiler 100, and a cyclone dust collector 102 is fixedly connected to the other side of the horizontal flue 101. The cyclone dust collector 102's structural design allows the soot generated during combustion inside the boiler 100 to enter the cyclone dust collector 102 through the horizontal flue 101. The cyclone dust collector 102's design facilitates the cyclone separation of larger impurities within the soot. A connecting pipe is fixedly connected to the bottom of the cyclone dust collector 102, with one side of the connecting pipe fixedly connected to the bottom of one side of the boiler 100. Larger impurities filtered by the cyclone dust collector 102 can re-enter the boiler 100 through the connecting pipe for secondary combustion. The top of the cyclone dust collector 102 is fixedly connected to a connecting flue 104, and the bottom of the connecting flue 104 is fixedly connected to an installation chamber 103. The connection between the cyclone dust collector 102 and the installation chamber 103 can be achieved through the structural design of the connecting flue 104. The installation chamber 103 is equipped with a high-temperature superheater, a low-temperature superheater, an economizer, and a wind controller from top to bottom. This facilitates the absorption of heat from the high-temperature flue gas filtered by the cyclone dust collector 102, which is used to heat the water inside the external water tank. The steam generated by heating the water is converted into electrical energy for storage. The top of the boiler 100, the cyclone dust collector 102, and the installation chamber 103 are all fixedly installed with fixing rings. Support frames are fixedly installed at both ends of the fixing rings to facilitate the support and placement of the boiler 100, the cyclone dust collector 102, the installation chamber 103, and the components above them.

[0024] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7As shown, multiple fixing collars 207 are fixedly installed at the bottom of the horizontal flue 101. Sealing sleeves 204 are threaded onto the outer surfaces of the fixing collars 207. Multiple actuating blocks are fixedly installed at the bottom of the sealing sleeves 204 to facilitate rotation later. The inner bottom of each sealing sleeve 204 has an opening, through which a connecting main pipe 203 slides and seals. A wind cap 206, located at the bottom of the horizontal flue 101, is threaded onto the top of the outer surface of each connecting main pipe 203. Multiple wind caps 206 have multiple air holes 205 on their outer surfaces, allowing the sealing sleeves 204 to be rotated and disengaged from the fixing collars later. When the external part of 207 is in place, it is convenient for operators to disassemble and replace the individual wind caps 206 later. The bottom of multiple main connecting pipes 203 is fixedly connected to three branch connecting pipes 202 located below the bottom of the horizontal flue 101. A main connecting pipe 208 is fixedly connected to the middle of the bottom of the three branch connecting pipes 202. Connecting plates are fixedly installed on both sides of the bottom of the three branch connecting pipes 202. Fixing blocks 200 are fixedly installed on the bottom of the boiler 100 and the cyclone dust collector 102 on the side closest to each other. Electric push rods 201 are fixedly installed on the top of each of the two fixing blocks 200. The output ends of the tops of the two electric push rods 201 are fixedly connected to the connecting plates at the bottom of the three branch connecting pipes 202. Later... The electric push rod 201 drives the connecting branch pipe 202 to move the connecting main pipe 203 and the vent cap 206 up and down within the sealing sleeve 204 and the bottom of the horizontal flue 101, facilitating the storage of the vent cap 206 and preventing soot from adhering to the outside of the vent cap 206 and clogging the air vent 205. An air pump 300 is fixedly installed on the bottom side of one side of the installation chamber 103. An air inlet pipe is fixedly connected to the input end of the air pump 300, and the air inlet pipe is connected to the bottom of the installation chamber 103. A connecting air pipe 301 is fixedly installed on the output end of the air pump 300, located below the connecting main pipe 208. A control valve 302 is fixedly connected to the top of the connecting air pipe 301. A connecting hose 303 is fixedly connected to the top, and the top of the connecting hose 303 is fixedly connected to the bottom of the connecting main pipe 208. Later, the connecting hose 303 and the connecting gas pipe 301 are connected by the control valve 302. Then, the flue gas discharged from the installation chamber 103 can be extracted by the air pump 300. Then, the gas can enter the interior of the connecting main pipe 208 and the connecting branch pipe 202 through the connecting gas pipe 301 and the connecting hose 303. Finally, it enters the interior of the air cap 206 through the connecting main pipe 203 and is discharged through the air hole 205 to clean the soot inside the horizontal flue 101. After the ash is cleaned, the flue gas velocity at the furnace outlet is reduced, which helps to improve the boiler efficiency.

[0025] It should be noted that this CFB boiler flue outlet ash cleaning device, during use, connects the connecting hose 303 and the connecting gas pipe 301 by opening the control valve 302. Then, the air pump 300 extracts the flue gas discharged from the installation chamber 103. The gas then enters the connecting main pipe 208 and the connecting branch pipe 202 through the connecting gas pipe 301 and the connecting hose 303, and finally enters the air cap 206 through the connecting main pipe 203, and is then discharged through the air hole 205 to clean the ash inside the horizontal flue 101. After ash cleaning, the flue gas velocity at the furnace outlet decreases, which helps improve boiler efficiency. Furthermore, before the ash cleaning operation, the electric push rod 201 needs to be used to circulate the gas. The connecting branch pipe 202 drives the connecting main pipe 203 and the air cap 206 to move inside the sealing sleeve 204, and then to the bottom of the horizontal flue 101. This facilitates the cleaning of the accumulated ash inside. By storing the air cap 206 and the air hole 205, the blockage of the air hole 205 caused by soot accumulation can be reduced, thus extending their service life. After the ash is cleaned, the air cap 206 and the air hole 205 can be moved down and stored by the electric push rod 201. At the same time, when the individual sealing sleeve 204 is rotated to fix the external connection of the fixing ring 207, the individual air cap 206 and the air hole 205 can be easily disassembled and replaced, ensuring the efficiency and convenience of later replacement.

[0026] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A CFB boiler flue outlet ash cleaning device, comprising a CFB boiler assembly (1), characterized in that, The CFB boiler assembly (1) includes a horizontal flue (101), and a cleaning assembly (2) extending to the outside of the inner bottom of the horizontal flue (101) is sealed and slidably connected to it. The bottom of the cleaning assembly (2) is fixedly connected to an extraction assembly (3) that communicates with the inside of the CFB boiler assembly (1).

2. A CFB boiler flue outlet ash cleaning device according to claim 1, characterized in that: The CFB boiler assembly (1) also includes a boiler (100), the horizontal flue (101) is fixedly connected to one side of the top of the boiler (100), the other side of the horizontal flue (101) is fixedly connected to a cyclone dust collector (102), and the bottom of the cyclone dust collector (102) is fixedly connected to the bottom of the boiler (100). The top of the cyclone dust collector (102) is fixedly connected to a connecting flue (104), and the bottom of the connecting flue (104) is fixedly connected to an installation chamber (103).

3. A CFB boiler flue gas pass outlet ash cleaning device according to claim 2, characterized in that: The cleaning assembly (2) includes multiple fixing collars (207) fixedly installed at the bottom of the horizontal flue (101). The external threads of the multiple fixing collars (207) are fitted with sealing sleeves (204). The bottom of the multiple sealing sleeves (204) is slidably sealed through a connecting main pipe (203). The external threads of the multiple connecting main pipes (203) are fitted with wind caps (206) placed inside the horizontal flue (101). The external surfaces of the multiple wind caps (206) are provided with multiple air holes (205).

4. A CFB boiler flue gas pass outlet ash cleaning device according to claim 3, characterized in that: The bottom of the multiple main connecting pipes (203) is fixedly connected to three branch pipes (202), and the bottom of the three branch pipes (202) is fixedly connected to a main connecting pipe (208). The bottom of the boiler (100) and the cyclone dust collector (102) on the side closest to each other is fixedly installed with a fixing block (200). The top of the two fixing blocks (200) is fixedly installed with an electric push rod (201), and the output end of the top of the two electric push rods (201) is connected to the bottom of the three branch pipes (202).

5. A CFB boiler flue gas pass outlet soot cleaning device according to claim 4, characterized in that: The air extraction assembly (3) includes an air pump (300) fixedly connected to the bottom of one side of the installation chamber (103). The output end of the air pump (300) is fixedly installed with a connecting air pipe (301) located below the connecting main pipe (208). The top of the connecting air pipe (301) is fixedly connected to a control valve (302). The top of the control valve (302) is fixedly connected to a connecting hose (303), and the top of the connecting hose (303) is fixedly connected to the bottom of the connecting main pipe (208).

6. The ash removal device for the outlet of a CFB boiler flue according to claim 2, characterized in that: The top of the boiler (100), cyclone dust collector (102) and installation chamber (103) are all fixedly installed with fixing rings, and the two ends of the fixing rings are fixedly installed with support frames.

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