Coal feeding device

Abstract

This utility model discloses a coal feeding device, including a main conveying pipe. The main conveying pipe is inclined at a certain angle to the horizontal and is arranged at a suitable distance from the furnace. The bottom end of the main conveying pipe is connected to the furnace at a suitable distance from the furnace. A sealing air duct and a coal-feeding port are arranged at the upper end of the main conveying pipe. A material discharge port is also provided on the main conveying pipe below the sealing air duct and the coal-feeding port. A coal-spreading air duct is arranged at the lower part of the main conveying pipe. The sealing air duct and the coal-spreading air duct are connected to the positive pressure hot air of the system. The coal feeding device of this utility model is equipped with a material discharge port, a sealing air duct, a coal-spreading air duct, a coal-feeding port, and other parts, ensuring safe and reliable fuel delivery and allowing for manual clearing in case of an accident. It is equipped with a lightweight hanging device to suspend the coal feeding device on a membrane water-cooled wall, making installation simple, convenient, and safe. It is equipped with a sealed cover to ensure that the cover does not deform or crack during long-term use in high-temperature environments.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, and in particular to a coal feeding device. Background Technology

[0002] The coal feeding device is a crucial component of a circulating fluidized bed boiler, and its structure is extremely important for boiler operation. Traditional coal feeding devices were bulky, making transportation, installation, disassembly, and maintenance inconvenient and costly. They were also prone to wear, deformation, and coal blockage, all of which could affect the safe operation of the boiler. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model designs a coal feeding device.

[0004] The present invention adopts the following technical solution:

[0005] A coal feeding device includes a main conveying pipe, which is inclined at an angle to the horizontal and arranged on the furnace. The bottom end of the main conveying pipe is connected to the furnace. A sealing air duct and a coal feeding port are arranged at the upper end of the main conveying pipe. A material discharge port is also provided on the main conveying pipe below the sealing air duct and the coal feeding port. A coal spreading air duct is arranged at the lower part of the main conveying pipe. The sealing air duct and the coal spreading air duct are connected to the positive pressure hot air of the system.

[0006] Sealed air ducts and coal feeding ducts are connected to the positive pressure hot air system to promote and ensure the safe transport of fuel in the main conveying pipe. A blind flange-type coal clearing port is installed, which can be opened in case of an emergency to manually clear any internal fuel blockages. The main conveying pipe is inclined at a certain angle to the horizontal and positioned at a suitable height from the furnace. The pipe diameter is designed according to the appropriate speed, which is beneficial for fuel transport and avoids direct erosion of the air caps inside the furnace, preventing wear. It also reasonably avoids the ash inlet in the furnace, playing a crucial role in reducing the carbon content of the bottom ash and improving boiler efficiency. Sealed air ducts are located above the main conveying pipe and are connected to the positive pressure hot air system. With an appropriate flow rate design, they promote fuel transport in the main conveying pipe and provide a sealing effect, ensuring safe transport. Coal feeding ducts are located at the bottom and are also connected to the positive pressure hot air system. With an appropriate flow rate design, they promote fuel transport in the main conveying pipe, prevent coal from sticking or caking at the furnace inlet, and prevent backflow of flue gas inside the furnace.

[0007] Preferably, the discharge port is arranged vertically, and its bottom is connected to the main conveying pipe. This facilitates the fuel's descent using its own gravity.

[0008] Preferably, the sealed air duct and the coal inlet are fixedly connected to the main conveying pipe via flanges.

[0009] Preferably, the main delivery pipe is welded to a steel plate connected to the membrane water-cooled wall using a lightweight hanging device.

[0010] Preferably, the lightweight hanging device uses a horizontal long pipe clamp to fix the main delivery pipe.

[0011] Preferably, the bottom of the main conveying pipe is sealed with a cover to prevent flue gas leakage from the furnace and ensure safe operation.

[0012] Preferably, the outer circumference of the casing is provided with multiple expansion joints to prevent deformation and cracking of the casing during long-term use in high-temperature environments.

[0013] Preferably, the main conveying pipe, the sealing air duct, and the coal feeding air duct are all made of stainless steel. The smooth interior facilitates fuel transport and allows for long-term use in high-temperature environments, while also being wear-resistant and reliable.

[0014] Preferably, the housing is welded to the membrane water-cooled wall using a comb-shaped plate structure.

[0015] The beneficial effects of this utility model are as follows: The coal feeding device of this utility model is equipped with parts such as a material discharge port, a sealed air duct, a coal feeding air duct, and a coal chute, which ensures the safe and reliable transportation of fuel and allows for manual clearing in case of an accident; it is equipped with a lightweight hanging device to suspend the coal feeding device on the membrane water-cooled wall, making installation simple, convenient, and safe; and it is equipped with a sealed cover to ensure that the cover does not deform or crack during long-term use in high-temperature environments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the main delivery pipe assembly in this utility model;

[0018] Figure 3 yes Figure 1 A cross-sectional view along the AA direction;

[0019] Figure 4 yes Figure 1 A cross-sectional view along the BB direction;

[0020] Figure 5 yes Figure 2 A schematic diagram of a combined structure of the material drop outlet and the main conveying pipe;

[0021] Figure 6 This is a schematic diagram of one structure of the cover in this utility model;

[0022] Figure 7 yes Figure 6 A view in the C direction;

[0023] Figure 8 yes Figure 7 A cross-sectional view along the DD direction;

[0024] Figure 9 yes Figure 7 A schematic diagram of a type of expansion joint.

[0025] In the diagram: 1. Main conveying pipe, 2. Material drop port, 3. Sealed air duct, 4. Coal feeding air duct, 5. Coal discharge port, 6. Lightweight hanging device, 7. Cover, 8. Expansion joint, 9. Comb plate structure. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0027] Example: Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, a coal feeding device includes a main conveying pipe 1, a feed inlet 2, a sealing air duct 3, a coal spreading air duct 4, and a coal outlet 5. The feed inlet 2, sealing air duct 3, and coal spreading air duct 4 are respectively combined with the main conveying pipe 1 as shown in the diagram, wherein the coal outlet 5 is sealed with a blind flange. The main conveying pipe 1 is arranged at a suitable distance from the furnace, forming a certain angle with the horizontal. The diameter of the main conveying pipe 1 is designed according to a suitable speed. The main conveying pipe 1, feed inlet 2, sealing air duct 3, and coal spreading air duct 4 are all made of stainless steel. Both the sealing air duct 3 and the coal spreading air duct 4 are connected to the system's positive pressure hot air, with appropriate flow rate designs selected to promote fuel transport within the main conveying pipe 1, and to seal and prevent adhesion or agglomeration, as well as prevent flue gas backflow.

[0028] like Figure 4 As shown, the lightweight hanging device 6 fixes the main delivery pipe 1 to the membrane water-cooled wall. The fixing position is selected in the middle of the main delivery pipe 1 and is accurately positioned and welded to the fixing point of the membrane water-cooled wall.

[0029] like Figures 6-9 As shown, the casing 7 is a comb-shaped plate structure welded to the membrane water-cooled wall. The casing steel plate at the connection point with the main delivery pipe 1 has pre-drilled holes to allow for sealing and welding after the main delivery pipe 1 is inserted during installation. Multiple expansion joints 8 are installed on the casing.

[0030] The main conveying pipe 1 of this utility model's coal feeding device is inclined at a certain angle to the horizontal, designed with an appropriate speed, and positioned at a suitable height from the furnace. The sealed air duct 1 and coal feeding air duct 4 are configured with appropriate flow rates. All ducts are connected to the system's positive pressure hot air, ensuring safe fuel delivery and preventing adhesion or caking. A blind flange-type coal chute 5 is also provided, which can be opened in case of an accident for manual clearing of internal fuel blockages. The entire coal feeding device is suspended from the membrane water-cooled wall by a lightweight hanging device 6, making installation simple and reliable. Furthermore, the bottom of the coal feeding device is sealed with a cover 7 equipped with multiple expansion joints 8, preventing deformation and cracking of the cover during long-term use in high-temperature environments.

[0031] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A coal feeding device, comprising a main conveying pipe, the main conveying pipe being inclined at an angle to the horizontal, the main conveying pipe being arranged on the furnace, and the bottom end of the main conveying pipe being connected to the furnace, characterized in that, The upper end of the main conveying pipe is equipped with a sealing air duct and a coal outlet. A material discharge port is also provided on the main conveying pipe below the sealing air duct and the coal outlet. A coal spreading air duct is configured at the lower part of the main conveying pipe. The sealing air duct and the coal spreading air duct are connected to the positive pressure hot air of the system.

2. The coal feeding device according to claim 1, characterized in that, The material discharge port is arranged vertically, and the bottom of the material discharge port is connected to the main conveying pipe.

3. The coal feeding device according to claim 1, characterized in that, The sealed air duct and the coal inlet are fixedly connected to the main conveying pipe via flanges.

4. The coal feeding device according to claim 1, characterized in that, The main delivery pipe is welded to a steel plate connected to the membrane water-cooled wall using a lightweight hanging device.

5. The coal feeding device according to claim 4, characterized in that, The lightweight hanging device uses a horizontal long pipe clamp to fix the main delivery pipe.

6. The coal feeding device according to claim 1, characterized in that, The bottom of the main delivery pipe is sealed with a cover.

7. The coal feeding device according to claim 6, characterized in that, Multiple expansion joints are provided around the outer edge of the casing.

8. The coal feeding device according to claim 1, characterized in that, The main conveying pipe, the sealed air duct, and the coal spreading air duct are all made of stainless steel.

9. The coal feeding device according to claim 6, characterized in that, The casing is constructed by welding a comb-shaped plate structure onto the membrane water-cooled wall.

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