A powder delivery bin based on a cross-powder delivery device between different boilers

Abstract

The utility model relates to the field of powder delivery, and in particular to a cross powder delivery device based on different boilers for a powder delivery bin, which comprises powder delivery mechanisms and powder delivery mechanisms, the powder delivery mechanisms are installed on a powder feeder, and are used to deliver the coal powder in the powder feeder to the powder delivery mechanisms through negative pressure, the powder delivery mechanisms comprise a powder delivery main pipe, a first powder delivery hose that is detachably connected to any powder delivery mechanism, and a second powder delivery hose that is connected to a powder delivery pipeline of adjacent hearths, the free ends of the first powder delivery hose and the second powder delivery hose are both connected to the powder delivery main pipe, and the purpose of safely and smoothly delivering coal powder is achieved through the implementation of the scheme.

Description

Technical Field

[0001] This utility model relates to the field of powder conveying, specifically to a powder conveying silo based on a cross-feeding device between different boilers. Background Technology

[0002] The applicant's original boiler was designed for lean coal, but due to changes in external factors, it has been converted to burn high-volatile bituminous coal. This conversion has brought safety hazards to production. For example, high-volatile coal powder is prone to slow oxidation during long-term storage, and the accumulated heat may lead to spontaneous combustion or even explosion when it reaches a critical point, threatening the safety of the power plant. One scenario is that when the boiler malfunctions and shuts down, the coal powder in the 20 feeders supplying the boiler needs to be discharged in a timely manner, usually within 24 hours, otherwise spontaneous combustion is highly likely. The initial solution was to discharge the coal powder from the 20 feeders into the pulverizing silo of the adjacent boiler. Specifically, the 20 feeders were connected to a main pipe via branch pipes, and then the coal powder was sent to the pulverizing silo of the adjacent boiler via the main pipe. The main pipe and branch pipes were rigid pipes, connected by T-joints. However, testing revealed at least two problems:

[0003] 1. If the high-volatile coal powder in the pulverizer of the faulty boiler has sparks, and it is discharged into the pulverizing silo next to the boiler, an explosion is very likely to occur because the pulverizing silo is a larger and enclosed space.

[0004] 2. Coal powder conveying is very difficult. Analysis suggests that the pipeline layout is too complex, and the installation angle of the pipeline is greater than 100° in order to adapt to the installation position of the pulverizing silo. Therefore, a combination of factors leads to excessive resistance in the transmission within the pipeline.

[0005] In summary, a safe and efficient conveying device for transporting pulverized coal needs to be designed. Utility Model Content

[0006] The present invention aims to provide a pulverized coal conveying device based on cross-feeding devices between different boilers, so as to provide a safe and smooth conveying device for pulverized coal.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: The pulverized coal feeding silo is based on a cross-feeding device between different boilers, including a pulverized coal discharging mechanism and a pulverized coal conveying mechanism. The pulverized coal discharging mechanism is installed on the pulverized coal feeder and is used to transfer the pulverized coal in the pulverized coal feeder to the pulverized coal conveying mechanism through negative pressure. The pulverized coal conveying mechanism includes a pulverized coal conveying main pipe and a first pulverized coal conveying hose detachably connected to any pulverized coal discharging mechanism and a second pulverized coal conveying hose connected to the pulverized coal feeding pipe of an adjacent furnace. The free ends of the first pulverized coal conveying hose and the second pulverized coal conveying hose are both connected to the pulverized coal conveying main pipe.

[0008] Preferably, as an improvement, the angle between the first powder conveying hose and the second powder conveying hose and the powder conveying main pipe in the powder conveying direction is 30-90°.

[0009] Preferably, as an improvement, the powder feeding mechanism includes an air compressor and a venturi tube, with the air compressor connected to the compressed air inlet end of the venturi tube and the throat of the venturi tube connected to the discharge port of the powder feeder.

[0010] Preferably, as an improvement, the air pressure output by the air compressor is 0.5-0.7 MPa.

[0011] Preferably, as an improvement, the powder conveying main pipe and the second powder conveying hose are DN150 pipes, and the first powder conveying hose is a DN100 pipe.

[0012] Preferably, as an improvement, the powder conveying main pipe is provided with a steel joint, and the steel joint, the first powder conveying hose and the second powder conveying hose are all provided with flanges.

[0013] Preferably, as an improvement, the powder conveying header is a rigid steel pipe.

[0014] The principle and advantages of this scheme are:

[0015] 1. This solution directly delivers pulverized coal to the coal feeding pipeline in the normally operating furnace, thereby directly burning it and avoiding the explosion risk that could easily be caused by previously delivering pulverized coal to the pulverizing silo.

[0016] 2. By designing the first coal conveying hose as a hose structure, the connection between the first coal conveying hose and different coal feeders can be easily changed according to the actual coal conveying situation, realizing a point-to-point single pipeline layout strategy, simplifying the entire pipeline system structure, reducing unnecessary pipeline bends and branches, thereby significantly reducing system resistance and improving the efficiency and stability of coal powder conveying.

[0017] 3. Without making any modifications to the existing pulverizing and conveying equipment, this solution cleverly utilizes a "diffuse" strategy to flexibly address the special properties of high volatile coal, minimizing potential risks and effectively improving production safety and overall operating efficiency at low cost, thereby maximizing cost-effectiveness.

[0018] 4. By organically combining the unit system and the main system, the flexibility of the unit system (first and second coal conveying hoses) is retained, while the efficient sharing of resources is achieved through the main system (coal conveying main pipe). Through a carefully designed conveying system, we have successfully solved the problem of storing high-volatile coal powder, while avoiding the huge investment and long-term downtime associated with traditional modification schemes. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the powder dispensing mechanism.

[0021] The reference numerals in the accompanying drawings include: powder feeder 1, powder dispensing mechanism 2, first powder conveying hose 3, powder conveying main pipe 4, second powder conveying hose 5, steel connector 6, hose connector 7, powder delivery pipe 8, venturi tube 9, compressed air hose 10. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The basic implementation examples are as follows: Figure 1 , Figure 2 As shown: The pulverized coal feeding silo is based on a cross-feeding device between different boilers, including a pulverized coal discharging mechanism 2 and a pulverized coal conveying mechanism. The pulverized coal discharging mechanism 2 is installed at the discharge port of the pulverizer 1 and is used to adsorb the pulverized coal in the pulverizer 1 into the pulverized coal conveying mechanism through negative pressure. In this embodiment, the pulverized coal discharging mechanism 2 includes an air compressor and a venturi tube 9. The output port of the air compressor is connected to the compressed air inlet end of the venturi tube 9 through a compressed air hose 10. The throat of the venturi tube 9 is sealed to the discharge port of the pulverizer 1. The use of the compressed air hose 10 as the connecting material, with its good flexibility and disassembly, greatly facilitates the installation, adjustment, and maintenance of the pipeline, ensuring rapid response in emergency situations and guaranteeing production safety and efficiency. The air pressure output by the air compressor is 0.5-0.7 MPa. The compressed air hose 10 is a DN50 rubber hose.

[0024] The powder conveying mechanism includes a powder conveying main pipe 4, a first powder conveying hose 3, and a second powder conveying hose 5. The powder conveying main pipe 4 is made of DN150 rigid steel pipe. Using a steel pipe of this size can effectively convey the powder and ensure conveying efficiency. If a DN100 rigid steel pipe is used, the transmission resistance inside the pipe will be too high. If a DN200 rigid steel pipe is used, the air velocity inside the pipe will be insufficient, and the powder cannot be carried by the airflow. One end of the first powder conveying hose 3 is detachably installed at the output end of the Venturi tube 9 below the powder feeder 1 that needs to release powder, and the other end is detachably connected to the powder conveying main pipe 4. One end of the second powder conveying hose 5 is detachably connected to the powder conveying main pipe 4, and the other end is detachably connected to an adjacent or any powder conveying pipe 8 in a normally operating furnace.

[0025] The angle between the first and second pulverized coal conveying hoses 3 and 5 and the pulverized coal conveying main pipe 4 in the pulverized coal conveying direction is 30-90°, which ensures smooth pulverized coal conveying throughout the process. Specifically, a 45° steel connector 6 is fixedly installed on the pulverized coal conveying main pipe 4, and the steel connector 6 is equipped with a flange; both the first and second pulverized coal conveying hoses 3 and 5 are equipped with hose connectors 7, which are also equipped with flanges. This allows the first and second pulverized coal conveying hoses 3 and 5 to be replaced between the various steel connectors 6 on the pulverized coal conveying main pipe 4, as well as between the various pulverized coal discharging mechanisms 2. The first pulverized coal conveying hose is a DN100 pipe, and the second pulverized coal conveying hose and the pulverized coal conveying main pipe are DN150 pipes. By matching the different pipe diameters of the above-mentioned pipes, the conveying resistance of the pulverized coal conveying mechanism can be significantly reduced, while ensuring conveying efficiency.

[0026] Specific operating instructions:

[0027] like Figure 1 As shown, when a fault occurs in furnace No. 2, the upper end of the first pulverized coal conveying hose 3 is connected to any one of the pulverized coal feeding mechanisms 2 among the 20 pulverized coal feeders 1 that feed pulverized coal to furnace No. 2 (the solid lines in the figure represent the first pulverized coal conveying hose 3 and the second pulverized coal conveying hose 5 that are already connected and working). Its lower end is connected to the nearest steel joint 6 on the pulverized coal conveying main pipe 4 (other unconnected steel joints 6 are sealed with flange plates). One end of the second pulverized coal conveying hose 5 is connected to the steel joint 6 closest to furnace No. 1, and its other end is connected to the pulverized coal conveying pipe 8 of furnace No. 1 to directly deliver pulverized coal to furnace No. 1.

[0028] After the pulverized coal in feeder 1 has been discharged, the upper end of the first pulverized coal conveying hose 3 is detached and installed on the pulverized coal discharging mechanism 2 of the next feeder 1 to continue discharging pulverized coal. This cycle continues until all 20 feeders have finished discharging pulverized coal. By discharging pulverized coal sequentially to each feeder, a point-to-point single pipeline layout strategy is achieved, avoiding problems such as uneven pulverized coal discharging caused by resistance and conveying load.

[0029] This project successfully achieved the longest material transport distance within the same boiler, spanning approximately 40 meters. It also successfully achieved the longest material transport distance for pulverized coal within the pulverized coal silos of adjacent boilers, spanning approximately 80 meters.

[0030] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A pulverized coal feeding silo based on a cross-feeding device between different boilers, characterized in that: It includes a pulverizing mechanism and a pulverizing conveying mechanism. The pulverizing mechanism is installed on the pulverizer and is used to transfer the pulverized coal in the pulverizer to the pulverizing conveying mechanism by negative pressure. The pulverizing conveying mechanism includes a pulverizing main pipe, a first pulverizing hose detachably connected to any pulverizing mechanism, and a second pulverizing hose connected to the pulverizing pipeline of an adjacent furnace. The free ends of the first pulverizing hose and the second pulverizing hose are both connected to the pulverizing main pipe.

2. The pulverized coal feeding silo based on the cross-feeding device between different boilers according to claim 1, characterized in that: The angle between the first and second powder conveying hoses and the powder conveying main pipe in the powder conveying direction is 30-90°.

3. The pulverized coal feeding silo based on the cross-feeding device between different boilers according to claim 2, characterized in that: The powder feeding mechanism includes an air compressor and a venturi tube. The air compressor is connected to the compressed air inlet end of the venturi tube, and the throat of the venturi tube is connected to the discharge port of the powder feeder.

4. The pulverized coal feeding silo based on the cross-pulverized coal feeding device between different boilers according to claim 3, characterized in that: The air compressor outputs an air pressure of 0.5–0.7 MPa.

5. The pulverized coal feeding silo according to claim 4, based on a cross-feeding device between different boilers, is characterized in that: The powder conveying main pipe and the second powder conveying hose are DN150 pipes, and the first powder conveying hose is a DN100 pipe.

6. The pulverized coal feeding silo according to claim 5, based on a cross-feeding device between different boilers, is characterized in that: The powder conveying main pipe is equipped with a steel joint, and flanges are provided on the steel joint, the first powder conveying hose, and the second powder conveying hose.

7. The pulverized coal feeding silo based on the cross-pulverized coal feeding device between different boilers according to claim 6, characterized in that: The powder conveying header is a rigid steel pipe.

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