Dry dedusting ash conveying pipeline pressure reduction device and method

Abstract

The invention relates to a depressurization device and method for a dry dedusting and ash conveying pipeline, and relates to the technical field of blast furnace ironmaking. The device comprises a dry dust removal bin body and a centralized dust discharge bin body, the dry dust removal bin body is communicated with the centralized dust discharge bin body, the dry dust removal bin body is further communicated with an abrasive bin body, and an abrasive nitrogen mixing device is arranged on the abrasive bin body and used for introducing blowing assisting nitrogen. The device has the effects that ash blocks adhered to the inner wall of the pipeline can be conveniently removed, so that the ash conveying pressure in the pipeline is reduced, and the frequency and the labor intensity of manual disassembly and blockage removal are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnace ironmaking, and in particular to a dry dust removal and ash conveying pipeline pressure reduction device and method. Background Art

[0002] Dry bag dust removal is a dust removal and purification device for blast furnace gas in the blast furnace ironmaking production process. Its technical feature is the use of bags and pulse nitrogen to separate dust and clean gas in blast furnace gas, which can protect and improve the service life of gas pipeline facilities and residual pressure power generation equipment, and has the effect of energy saving and environmental protection. At present, most blast furnace operating areas in the existing technology use dry bag dust removal systems, and use pipeline pneumatic ash conveying devices to transport the dust separated from blast furnace gas, which can avoid dust and gas leakage during the ash conveying process, and is safer and more environmentally friendly.

[0003] However, in the actual production process, a small amount of water vapor will be mixed in the coal gas due to the production raw materials and production process. After these coal gases pass through the furnace top riser, downpipe, gravity dust removal and other pipelines and facilities, the coal gas temperature will drop, and the water vapor in the coal gas will also condense and precipitate. The precipitated water will increase the humidity and viscosity of the dust ash, which makes these dusts easily adhere to the ash conveying pipeline wall, causing the pipeline ash conveying pressure to increase, and in severe cases, blockage will occur; when the ash conveying pipeline is blocked and the pressure increases, the current solution can only be to dismantle the blocked pipeline in sections, flush or knock on the ash blocks adhered to the pipe wall. This method is time-consuming and labor-intensive, and the above phenomenon occurs frequently in the cold winter season, which greatly increases the labor intensity of the operators. In addition, there is a risk of gas leakage during the pipeline disassembly and assembly, and the safety hazards are greatly increased, so it needs to be improved. Summary of the Invention

[0004] In order to facilitate the removal of ash blocks adhered to the inner wall of the pipeline, thereby reducing the ash conveying pressure in the pipeline and reducing the number of manual disassembly and unblocking times and labor intensity, the present application provides a dry dust removal and ash conveying pipeline pressure reduction device and method.

[0005] In the first aspect, the present application provides a dry dust removal and ash conveying pipeline pressure reduction device adopts the following technical solution:

[0006] A dry dust removal and ash conveying pipeline pressure reduction device includes a dry dust removal bin and a centralized ash discharge bin. The dry dust removal bin is connected to the centralized ash discharge bin, and the dry dust removal bin is also connected to an abrasive bin. The abrasive bin is provided with an abrasive nitrogen mixing device, and the abrasive nitrogen mixing device is used to introduce blowing nitrogen.

[0007] Preferably, the abrasive silo includes an abrasive storage silo, the top of the abrasive storage silo is connected to an abrasive input pipe, a hydraulic abrasive input valve is provided on the abrasive input pipe, the lower end of the abrasive storage silo is connected to an electric ash unloading valve and a frequency modulation motor, the electric ash unloading valve is connected to an abrasive nitrogen mixing device, the abrasive nitrogen mixing device includes a boiling valve body, the side wall of the boiling valve body is connected to an abrasive-nitrogen high-pressure output valve, a pneumatic nitrogen blow-assist valve and a pneumatic nitrogen boiling valve.

[0008] Preferably, a pressure release pipe is also provided on the upper surface of the abrasive storage bin body, and the pressure release pipe includes a vertical section, a bent section and a horizontal section. A safety valve, a safety valve manual inspection valve and a safety valve bleed pipe are provided on the vertical section of the pressure release pipe, a dust filter cloth is provided in the bent section of the pressure release pipe, a pneumatic equalizing valve is provided on the bent section of the pressure release pipe, and a pneumatic bin body pressurizing valve is provided on the horizontal section of the pressure release pipe.

[0009] Preferably, a bin pressure gauge and a manual inspection valve for the pressure gauge are also provided on the top of the abrasive storage bin.

[0010] Preferably, the pipeline pressure value applicable to the device is 0.05Mpa-0.12Mpa.

[0011] In a second aspect, the present application also provides a method for reducing the pressure of a dry dust removal ash conveying pipeline, comprising the following steps:

[0012] S1: Stop discharging ash from the dry dust removal bin and the centralized dust discharge bin, and start the abrasive bin and the abrasive nitrogen mixing device;

[0013] S2: Before injecting abrasive into the abrasive storage silo, it is necessary to confirm that the pneumatic silo pressurizing valve, electric ash unloading valve, pneumatic nitrogen auxiliary blowing valve, pneumatic nitrogen boiling valve, and abrasive-nitrogen high-pressure output valve are closed, confirm that the frequency modulation motor is in the stopped state, open the pneumatic equalizing valve, confirm that the pressure displayed on the silo pressure gauge is zero, connect the abrasive input pipe to the ash discharge pipe of the ash tank truck, and after completing the above preparations, open the hydraulic abrasive input valve to add abrasive. After the filling is completed, close the hydraulic abrasive input valve and the pneumatic equalizing valve;

[0014] S3: After the filling is completed, the ash conveying pipe is cleared and blocked, and the hydraulic abrasive input valve and the pneumatic pressure equalizing valve are confirmed to be closed. The abrasive-nitrogen high-pressure output valve, boiling valve body, pneumatic nitrogen boiling valve, pneumatic nitrogen auxiliary blowing valve, pneumatic bin pressurizing valve and electric ash unloading valve are opened in sequence, and the frequency modulation motor is adjusted to the appropriate number of revolutions.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. The device of the present application does not require changes to the existing dry dust removal equipment structure. Only the relevant abrasive supply device needs to be added, which is a simple modification. This facilitates the removal of dust blocks adhered to the inner wall of the pipeline, thereby reducing the dust conveying pressure in the pipeline, reducing the number of manual disassembly and unblocking operations, saving manpower and material resources, and reducing the safety risks of gas operations.

[0017] 2. The abrasive selected in this application is gravity dust removal granular ash, which is composed of blast furnace raw material ash with a particle size of about 5 mm, has a certain hardness and roughness, and this material can be transported together with dry bag dust removal ash to sintering ingredients or new materials for reuse, and has good reuse value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural block diagram of a dry dust removal and ash conveying pipeline pressure reduction method in Example 1 of the present application.

[0019] Figure 2 This is a structural schematic diagram of an abrasive bin and an abrasive nitrogen mixing device of a dry dust removal and ash conveying pipeline pressure reduction device in Example 1 of the present application.

[0020] Figure 3 This is a structural schematic diagram of a dry dust removal and ash conveying pipeline pressure reduction device in Example 2 of the present application.

[0021] Explanation of the accompanying symbols: 1. Abrasive input pipeline; 2. Hydraulic abrasive input valve; 3. Safety valve; 4. Manual inspection valve for safety valve; 5. Safety valve vent pipe; 6. Pressure release pipe; 7. Dust removal filter cloth; 8. Pneumatic equalizing valve; 9. Pneumatic silo pressurizing valve; 10. Abrasive storage silo; 11. Electric ash unloading valve; 12. Frequency modulation motor; 13. Pneumatic nitrogen auxiliary blowing valve; 14. Pneumatic nitrogen boiling valve; 15. Boiling valve body; 16. Abrasive-nitrogen high-pressure output valve; 17. Silo pressure gauge; 18. Manual inspection valve for pressure gauge; 19. Dry dust removal silo; 20. Centralized ash discharge silo; 21. Abrasive silo; 22. Abrasive nitrogen mixing device; 23. High material level sensor; 24. Bottom material level sensor. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-3 This application is described in further detail.

[0023] Example 1:

[0024] Example 1 of the present application discloses a dry dust removal ash conveying pipeline pressure reduction device. Figure 1 and Figure 2, including a dry dust removal bin body 19 and a centralized dust discharge bin body 20. The dry dust removal bin body 19 is connected to the centralized dust discharge bin body 20. The dry dust removal bin body 19 is also connected to an abrasive bin body 21. The abrasive bin body 21 is provided with an abrasive nitrogen mixing device 22. The abrasive nitrogen mixing device 22 is used to introduce blowing nitrogen.

[0025] Reference Figure 1 and Figure 2 The abrasive bin body 21 includes an abrasive storage bin body 10, the top of the abrasive storage bin body 10 is connected to an abrasive input pipe 1, and a hydraulic abrasive input valve 2 is provided on the abrasive input pipe 1. The lower end of the abrasive storage bin body 10 is connected to an electric ash unloading valve 11 and a frequency modulation motor 12. The electric ash unloading valve 11 is connected to an abrasive nitrogen mixing device 22. The abrasive nitrogen mixing device 22 includes a boiling valve body 15, and the side wall of the boiling valve body 15 is connected to an abrasive-nitrogen high-pressure output valve 16, a pneumatic nitrogen auxiliary blowing valve 13 and a pneumatic nitrogen boiling valve 14; in this embodiment, the abrasive selected in this application is gravity dust removal granular ash, which is composed of blast furnace raw material ash with a particle size of about 5 mm, has a certain hardness and roughness, and the material can be transported together with dry bag dust removal ash to sintering ingredients or new materials for reuse, and has good reuse value.

[0026] Reference Figure 1 and Figure 2 A pressure release pipe 6 is also provided on the upper surface of the abrasive storage bin body 10. The pressure release pipe 6 includes a vertical section, a bent section and a horizontal section. A safety valve 3, a safety valve manual inspection valve 4 and a safety valve bleed pipe 5 are provided on the vertical section of the pressure release pipe 6. A dust removal filter cloth 7 is provided in the bent section of the pressure release pipe 6. A pneumatic equalizing valve 8 is provided on the bent section of the pressure release pipe 6. A pneumatic bin pressurizing valve 9 is provided on the horizontal section of the pressure release pipe 6. In this embodiment, in order to ensure environmental protection requirements and avoid dust being discharged into the air during pressure equalization, the dust removal filter cloth 7 should be replaced in time when it becomes dirty to avoid pressure equalization blockage.

[0027] Reference Figure 1 A silo pressure gauge 17 and a manual pressure gauge inspection valve 18 are also provided on the top of the abrasive storage silo 10. The pipeline pressure value applicable to the device of this application is 0.05Mpa-0.12Mpa.

[0028] The implementation principle of a dry dust removal and ash conveying pipeline pressure reduction device in Example 1 of the present application is: an abrasive tank pump and related pipeline valve groups are added to the end of the ash conveying pipeline, and the device is opened when the pressure of the ash conveying pipeline increases. The device will use high-pressure nitrogen to spray abrasives with a particle size of 3-5mm into the ash conveying pipeline, so as to achieve the effect of impacting and grinding the ash blocks adhered to the pipe wall.

[0029] The present application also discloses a method for reducing the pressure of a dry dust removal ash conveying pipeline, comprising the following steps:

[0030] S1: Stop the dry dust removal bin 19 and the centralized dust discharge bin 20, and start the abrasive bin 21 and the abrasive nitrogen mixing device 22;

[0031] S2: Before injecting abrasive into the abrasive storage bin 10, it is necessary to confirm that the pneumatic bin pressurizing valve 9, the electric ash unloading valve 11, the pneumatic nitrogen auxiliary blowing valve 13, the pneumatic nitrogen boiling valve 14, and the abrasive-nitrogen high-pressure output valve 16 are closed, and the frequency modulation motor 12 is in the stopped state. The pneumatic equalizing valve 8 is opened, and the pressure displayed on the bin pressure gauge 17 is confirmed to be zero. The abrasive input pipe 1 is connected to the ash discharge pipe of the ash tank truck. After completing the above preparations, the hydraulic abrasive input valve 2 is opened to add abrasive. After the filling is completed, the hydraulic abrasive input valve 2 and the pneumatic equalizing valve 8 are closed;

[0032] S3: After the filling is completed, the ash conveying pipe is cleared and blocked, and the hydraulic abrasive input valve 2 and the pneumatic equalizing valve 8 are confirmed to be closed. The abrasive-nitrogen high-pressure output valve 16, boiling valve body 15, pneumatic nitrogen boiling valve 14, pneumatic nitrogen auxiliary blowing valve 13, pneumatic bin pressurizing valve 9 and electric ash unloading valve 11 are opened in sequence, and the frequency modulation motor 12 is adjusted to the appropriate number of revolutions.

[0033] Example 2:

[0034] Reference Figure 3 Different from Example 1, Example 2 is adapted to modern production and convenient for personnel control. On the basis of Example 1, automation and electrification design are added. Specifically, the hydraulic abrasive input valve 2, pneumatic equalizing valve 8, pneumatic bin pressurizing valve 9, pneumatic nitrogen blowing valve 13, pneumatic nitrogen boiling valve 14 and abrasive-nitrogen high-pressure output valve 16 in Example 1 are replaced by pneumatic control valves, and are equipped with a switch signal capture device, and a high material level sensor 23 and a bottom material level sensor 24 are set; all pneumatic control valves are controlled by nitrogen. Since there is a nitrogen gas source in the design application situation and nitrogen is an inert gas, it is suitable for coal gas areas.

[0035] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A dry dust removal and ash conveying pipeline pressure reduction device, characterized by: It includes a dry dust removal bin and a centralized dust discharge bin. The dry dust removal bin is connected to the centralized dust discharge bin. The dry dust removal bin is also connected to an abrasive bin. An abrasive nitrogen mixing device is provided on the abrasive bin for introducing blowing nitrogen.

2. A dry dust removal and ash conveying pipeline pressure reduction device according to claim 1, characterized in that: The abrasive bin body includes an abrasive storage bin body, the top of the abrasive storage bin body is connected to an abrasive input pipe, the abrasive input pipe is provided with a hydraulic abrasive input valve, the lower end of the abrasive storage bin body is connected to an electric ash unloading valve and a frequency modulation motor, the electric ash unloading valve is connected to an abrasive nitrogen mixing device, the abrasive nitrogen mixing device includes a boiling valve body, and the side wall of the boiling valve body is connected to an abrasive-nitrogen high-pressure output valve, a pneumatic nitrogen blowing-assisting valve and a pneumatic nitrogen boiling valve.

3. A dry dust removal and ash conveying pipeline pressure reduction device according to claim 2, characterized in that: A pressure release pipe is also provided on the upper surface of the abrasive storage bin body, and the pressure release pipe includes a vertical section, a bent section and a horizontal section. A safety valve, a manual safety valve inspection valve and a safety valve bleed pipe are provided on the vertical section of the pressure release pipe. A dust filter cloth is provided in the bent section of the pressure release pipe. A pneumatic equalizing valve is provided on the bent section of the pressure release pipe. A pneumatic bin body pressurizing valve is provided on the horizontal section of the pressure release pipe.

4. The dry dust removal and ash conveying pipeline pressure reduction device according to claim 2, characterized in that: A bin pressure gauge and a manual inspection valve for the pressure gauge are also provided on the top of the abrasive storage bin.

5. The dry dust removal and ash conveying pipeline pressure reduction device according to claim 1 is characterized in that: The device is suitable for a pipeline pressure value of 0.05Mpa-0.12Mpa.

6. A dry dust removal ash conveying pipeline pressure reduction method, characterized in that: The steps include: S1: Stop discharging ash from the dry dust removal bin and the centralized dust discharge bin, and start the abrasive bin and the abrasive nitrogen mixing device; S2: Before injecting abrasive into the abrasive storage silo, it is necessary to confirm that the pneumatic silo pressurizing valve, electric ash unloading valve, pneumatic nitrogen auxiliary blowing valve, pneumatic nitrogen boiling valve, and abrasive-nitrogen high-pressure output valve are closed, confirm that the frequency modulation motor is in the stopped state, open the pneumatic equalizing valve, confirm that the pressure displayed on the silo pressure gauge is zero, connect the abrasive input pipe to the ash discharge pipe of the ash tank truck, and after completing the above preparations, open the hydraulic abrasive input valve to add abrasive. After the filling is completed, close the hydraulic abrasive input valve and the pneumatic equalizing valve; S3: After the filling is completed, the ash conveying pipe is cleared and blocked, and the hydraulic abrasive input valve and the pneumatic pressure equalizing valve are confirmed to be closed. The abrasive-nitrogen high-pressure output valve, boiling valve body, pneumatic nitrogen boiling valve, pneumatic nitrogen auxiliary blowing valve, pneumatic bin pressurizing valve and electric ash unloading valve are opened in sequence, and the frequency modulation motor is adjusted to the appropriate number of revolutions.

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