A new coal powder fluidized coal discharging device

Abstract

The utility model provides a novel coal powder fluidization coal discharging device belongs to coal powder fluidization coal discharging technical field. This novel coal powder fluidization coal discharging device, including the coal discharging mouth of blowing jar and coal powder blowing jar, the coal discharging mouth of blowing jar is installed in the inside of coal powder blowing jar, the one side of coal powder blowing jar is provided with bottom fluidization pipeline, the inside bottom surface of coal powder blowing jar is installed with fluidization board, the coal discharging mouth of blowing jar is located one end of coal powder boiling zone and is installed with coal inlet filter screen. The utility model discloses through the area of coal discharging mouth of blowing jar and increases coal inlet filter screen, the hole of coal inlet filter screen is the % of the diameter of spray gun, is about mm or so, prevents the large -sized particle to enter the pipeline, prevents the large -sized sundries in the coal powder and enters the coal injection pipeline through the setting of coal inlet filter screen, on the other hand can also break up the caked coal powder under the action of airflow, eliminates the large -sized sundries in the coal powder, prevents the occurrence of blast furnace gun block phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of coal pulverized fluidized coal discharge technology, and more specifically, to a novel coal pulverized fluidized coal discharge device. Background Technology

[0002] Pulverized coal injection (PCI) is a key technology in modern blast furnace ironmaking. It involves directly injecting finely ground pulverized coal into the blast furnace through the tuyeres to replace some of the coke, providing heat and reducing agents for blast furnace smelting, thereby reducing the coke ratio and blast furnace smelting costs. The PCI system includes a pulverizing system and an injection system. The injection tanks in the injection system are responsible for directly injecting and conveying pulverized coal into the blast furnace. The main functions of the injection tanks include the following: (1) It is used to temporarily store coal powder transported from the coal powder silo, which plays a buffer role and ensures the continuity of the coal injection process. By alternating use, it achieves seamless connection between coal loading and coal injection.

[0003] (2) Fluidizing gas (such as nitrogen) is used to make the coal powder fluidized in the tank, thereby improving the fluidity of the coal powder and preventing arching or blockage.

[0004] (3) The injection tank regulates the pressure inside the tank by pressurizing and replenishing gas to provide power for the conveying of pulverized coal. The tank pressure and the pressure of the injection main pipe and the blast furnace distributor must maintain a reasonable pressure difference to ensure that the pulverized coal is stably conveyed to the blast furnace tuyeres.

[0005] The above-mentioned process still has some problems in actual production. The fluidization form of pulverized coal is too simple, and fluidization only occurs in a local area at the top of the fluidizing plate. After the pulverized coal enters the pulverized coal injection pipe, it loses the external gas source for fluidization, resulting in pulverized coal being transported in the subsequent pulverized coal injection pipe. It also affects the continuous and stable metering of pulverized coal, causing fluctuations in the measurement data of the pulverized coal injection quantity, which affects the precise control. Debris entering the injection tank directly enters the coal outlet pipe through the coal inlet and enters the blast furnace, which can easily cause blockage of the pulverized coal injection gun in the blast furnace. Utility Model Content

[0006] To overcome the above deficiencies, this utility model provides a novel coal pulverization fluidized coal discharge device that overcomes or at least partially solves the above technical problems.

[0007] This utility model is implemented as follows: This utility model provides a novel coal pulverized fluidized coal discharge device, including a coal outlet of a pulverized coal injection tank and a coal pulverized coal injection tank. The coal outlet of the pulverized coal injection tank is installed inside the coal pulverized coal injection tank. A bottom fluidization pipe is provided on one side of the coal pulverized coal injection tank. A fluidization plate is installed on the bottom surface of the inside of the coal pulverized coal injection tank. A control valve is installed on one side of the coal outlet of the pulverized coal injection tank. A coal pulverized coal boiling zone is isolated between one end of the coal outlet of the pulverized coal injection tank and the bottom surface of the fluidization plate. A coal injection pipe is fixedly connected to one end of the coal outlet of the pulverized coal injection tank. An air supply pipe is fixedly connected to the outside of the coal injection pipe. A control valve is installed on the outside of the air supply pipe. A coal control valve and an air supply mixer are installed on the outside of the coal injection pipe. A coal inlet filter screen is installed at one end of the coal outlet of the injection tank, which is located in the coal boiling zone.

[0008] In a preferred embodiment, an internal fluidizing gas pipeline is fixedly connected to the outside of the pulverized coal injection pipeline, and an internal fluidizing gas control valve and an internal fluidizing gas regulating valve are respectively installed on the outside of the internal fluidizing gas pipeline.

[0009] In a preferred embodiment, an annular channel for fluidized gas is fixedly connected between the fluidized gas pipeline, the coal outlet of the injection tank, and the pulverized coal pipeline.

[0010] In a preferred embodiment, the coal inlet filter screen is made of stainless steel, and the mesh size of the coal inlet filter screen is 5mm.

[0011] In a preferred embodiment, the inside of the coal outlet of the injection tank is provided with a pulverized coal channel, the inside of the pulverized coal channel is installed with a fluidizing mesh inside the pipe sleeve, and the inside of the pulverized coal channel is circulated with a fluidizing gas flow.

[0012] In a preferred embodiment, the coal inlet filter screen is spherical.

[0013] The present invention provides a novel pulverized coal fluidized bed discharge device, the advantages of which include: 1. By installing a coal inlet filter screen, a coal inlet filter screen is added in the area of ​​the coal outlet of the injection tank. The holes of the coal inlet filter screen are % of the diameter of the injection gun, about mm. This prevents large particles from entering the pipeline. The installation of the coal inlet filter screen not only prevents large particles of impurities in the pulverized coal from entering the pulverized coal injection pipeline, but also breaks up clumps of pulverized coal under the action of airflow, eliminating large foreign particles inside the pulverized coal and preventing blast furnace lance blockage.

[0014] 2. By setting up an annular fluidizing gas channel inside the pipeline, the outside of the annular channel is gas and the inside is pulverized coal. The gas from the outside enters the pulverized coal channel evenly through the permeable gaps, which performs secondary fluidization on the pulverized coal in the pipeline, eliminates the pulverized coal settling phenomenon in the pulverized coal pipeline, eliminates the conventional "dust flow" and "plunger flow", and makes the pulverized coal flow and transport evenly under the action of fluidizing gas, thereby achieving the purpose of eliminating the pulsation phenomenon in pulverized coal transportation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure provided by an embodiment of the present utility model; Figure 2 A schematic diagram of the coal inlet filter screen structure provided for an embodiment of this utility model.

[0017] In the diagram: 1. Coal outlet of the pulverized coal injection tank; 2. Fluidized coal boiling zone; 3. Fluidizing plate; 4. Control valve one; 5. Bottom fluidizing pipe; 6. Coal control valve; 7. Gas mixer; 8. Pulverized coal injection pipe; 9. Control valve two; 10. Gas supply pipe; 11. Coal inlet filter screen; 12. Fluidized gas flow in the pipe; 13. Fluidized net in the inner sleeve of the pipe; 14. Pulverized coal channel; 15. Annular fluidized gas channel in the pipe; 16. Fluidized gas pipe in the pipe; 17. Fluidized gas control valve in the pipe; 18. Fluidized gas regulating valve in the pipe; 19. Pulverized coal injection tank. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Reference Figures 1-2This utility model provides a technical solution: a novel pulverized coal fluidized coal discharge device, including a coal outlet 1 of a pulverized coal injection tank and a pulverized coal injection tank 19. The coal outlet 1 is installed inside the pulverized coal injection tank 19. A bottom fluidization pipe 5 is provided on one side of the pulverized coal injection tank 19. A fluidization plate 3 is installed on the bottom surface inside the pulverized coal injection tank 19. A control valve 4 is installed on one side of the coal outlet 1. A pulverized coal boiling zone 2 is isolated between one end of the coal outlet 1 and the bottom surface of the fluidization plate 3. A pulverized coal injection pipe 8 is fixedly connected to one end of the coal outlet 1. An air supply pipe 10 is fixedly connected to the outside of the pulverized coal injection pipe 8. A control valve 2 9 is installed on the outside of the pulverized coal injection pipe 8, and a coal control valve 6 and a gas mixing device 7 are installed on the outside of the pulverized coal injection pipe 8. In the above, the pulverized coal in the pulverized coal injection tank 19 enters the bottom fluidized tank through the bottom fluidized pipe 5 and the control valve 1 4, and is discharged through the fluidized plate 3. The pulverized coal on the fluidized plate 3 boils, forming a pulverized coal boiling zone 2 near the coal outlet 1 of the injection tank. The fluidized coal enters the gas mixing device 7 through the coal outlet 1 of the injection tank and the coal outlet control valve 6. The gas enters the final pulverized coal injection pipe 8 through the gas filling pipe 10 and the related control valve 2 9, and enters the blast furnace through the pulverized coal injection pipe 8, thereby completing the purpose of coal discharge. A coal inlet filter 11 is installed at one end of the coal outlet 1 of the injection tank, located in the coal boiling zone 2. A coal powder channel 14 is provided inside the coal outlet 14, and a fluidizing mesh 13 is installed inside the coal powder channel 14. A fluidizing gas flow 12 flows through the coal powder channel 14. A fluidizing gas pipeline 16 is fixedly connected to the outside of the coal injection pipeline 8. A fluidizing gas control valve 17 and a fluidizing gas regulating valve 18 are installed on the outside of the fluidizing gas pipeline 16. The coal inlet filter 11 is made of stainless steel, with 5mm holes and a spherical shape. The fluidizing gas is controlled by the fluidizing gas control valve 17 and the fluidizing gas regulating valve 18. The amount of fluidizing gas in the pipeline can be adjusted according to the amount and speed of pulverized coal injection. If the pulverized coal flow rate in the pipeline is relatively slow, the regulating valve is opened to increase the amount of fluidizing gas in the pipeline; conversely, it is reduced to ensure that the pulverized coal conveying speed is greater than the settling speed and to prevent settling pulsation. In the above, by adding a coal inlet filter screen 11 in the area of ​​the coal outlet 1 of the injection tank, the hole size of the coal inlet filter screen 11 is 30% of the diameter of the injection gun, about 5mm, to prevent large particles from entering the pipeline. The setting of the coal inlet filter screen 11 prevents large particles of debris in the pulverized coal from entering the pulverized coal injection pipeline 8. On the other hand, it can also break up the lumps of pulverized coal under the action of airflow, eliminate large foreign objects inside the pulverized coal, and prevent the blast furnace lance blockage.

[0020] An annular fluidized gas channel 15 is fixedly connected between the fluidized gas pipeline 16, the coal outlet 1 of the injection tank, and the pulverized coal pipeline 8. The annular fluidized gas channel 15 is made of a breathable fluidizing mesh. The outside of the annular fluidized gas channel 15 is gas, and the inside is pulverized coal. The gas from the outside enters the pulverized coal channel 14 evenly through the permeable gaps, which performs secondary fluidization on the pulverized coal in the pipeline, eliminates the pulverized coal settling phenomenon in the pulverized coal pipeline, eliminates the conventional "dust flow" and "plunger flow", and makes the pulverized coal flow and transport evenly under the action of the fluidized gas, thereby achieving the purpose of eliminating the pulverization phenomenon in the transport of pulverized coal.

[0021] Specifically, the working process or principle of this novel pulverized coal fluidized bed coal discharge device is as follows: During use, the pulverized coal in the pulverized coal injection tank 19 enters the bottom fluidized tank through the bottom fluidized pipe 5 and control valve 4, and is discharged through the fluidized plate 3. The pulverized coal on the fluidized plate 3 boils, forming a pulverized coal boiling zone 2 near the coal outlet 1 of the injection tank. The fluidized coal enters the gas mixing unit 7 through the coal outlet 1 of the injection tank and the coal discharge control valve 6. The gas enters the final pulverized coal injection pipe 8 through the gas supply pipe 10 and related control valve 9, and then enters the blast furnace through the pulverized coal injection pipe 8, thereby completing the purpose of coal discharge. The fluidized gas control valve 17 and the fluidized gas regulating valve 18 in the pipeline can be used to adjust the pulverized coal injection according to the pulverized coal injection process. The amount and speed of fluidizing gas in the pipeline are adjusted. If the coal powder flow rate in the pipeline is relatively slow, the regulating valve is opened to increase the amount of fluidizing gas in the pipeline; conversely, it is reduced to ensure that the coal powder conveying speed is greater than the settling speed and to prevent settling pulsation. In the above, by adding a coal inlet filter screen 11 in the area of ​​the coal outlet 1 of the injection tank, the hole size of the coal inlet filter screen 11 is 30% of the diameter of the injection gun, about 5mm, to prevent large particles from entering the pipeline. The setting of the coal inlet filter screen 11 prevents large particles of debris in the coal powder from entering the coal injection pipeline 8. On the other hand, it can also break up the clumps of coal powder under the action of airflow, eliminate large particles of foreign matter inside the coal powder, and prevent the blast furnace lance blockage.

[0022] It should be noted that the fluidizing gas control valve 17 and the fluidizing gas regulating valve 18 in the pipeline are existing devices or equipment, or devices or equipment that can be implemented by existing technology. Their power supply, specific composition and principle are clear to those skilled in the art, so they will not be described in detail.

Claims

1. A novel pulverized coal fluidized bed discharge device, comprising a coal outlet (1) of a pulverized coal injection tank and a pulverized coal injection tank (19), characterized in that, The coal outlet (1) of the injection tank is installed inside the pulverized coal injection tank (19). A bottom fluidization pipe (5) is provided on one side of the pulverized coal injection tank (19). A fluidization plate (3) is installed on the bottom surface of the inside of the pulverized coal injection tank (19). A control valve (4) is installed on one side of the coal outlet (1) of the injection tank. A pulverized coal boiling zone (2) is isolated between one end of the coal outlet (1) of the injection tank and the bottom surface of the fluidization plate (3). A pulverized coal injection pipe (8) is fixedly connected to one end of the coal outlet (1) of the injection tank. A gas supply pipe (10) is fixedly connected to the outside of the pulverized coal injection pipe (8). A control valve (9) is installed on the outside of the gas supply pipe (10). A coal control valve (6) and a gas supply mixer (7) are installed on the outside of the pulverized coal injection pipe (8). The coal outlet (1) of the injection tank is equipped with a coal inlet filter screen (11) at one end located in the coal boiling zone (2).

2. The novel pulverized coal fluidized bed discharge device according to claim 1, characterized in that, The pulverized coal injection pipe (8) is fixedly connected to the outside of the pipe fluidizing gas pipe (16), and the pipe fluidizing gas control valve (17) and the pipe fluidizing gas regulating valve (18) are respectively installed on the outside of the pipe fluidizing gas pipe (16).

3. The novel coal pulverization fluidized bed discharge device according to claim 2, characterized in that, The fluidized gas pipeline (16), the coal outlet (1) of the injection tank, and the pulverized coal pipeline (8) are fixedly connected by an annular channel (15) for fluidized gas.

4. The novel coal pulverized fluidized bed discharge device according to claim 3, characterized in that, The coal inlet filter screen (11) is made of stainless steel, and the size of the holes in the coal inlet filter screen (11) is 5mm.

5. A novel coal pulverized fluidized bed discharge device according to claim 4, characterized in that, The coal outlet (1) of the injection tank is provided with a coal powder channel (14), and a fluidized net (13) is installed inside the coal powder channel (14). Fluidized airflow (12) flows inside the coal powder channel (14).

6. A novel coal pulverized fluidized bed discharge device according to claim 5, characterized in that, The coal inlet filter screen (11) is spherical.

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