Method for quickly clearing blockage of conical part of dry dedusting box body

Abstract

The invention discloses a method for quickly removing blockage of a conical part of a dry dedusting box body, belongs to the technical field of metallurgical industry, and solves the problems that the box body of the existing blast furnace is easy to block and the production is influenced. The method comprises the following steps: blowing by introducing nitrogen into the conical part of the box body to dilute accumulated dust of the conical part and remove dust easy to fall on the surface, and then rapping the outer part of the box body by adopting a long-handle hammer to loosen the caked dust on the inner wall of the box body so as to facilitate the falling of the caked dust. And then high-pressure airflow is injected into the conical part of the box body through an air compression gun, so that cakes are knocked down, the preliminary blockage clearing effect is achieved, then pressure building is conducted by opening a bin pump fluidization valve, when the pressure reaches a good value, a feeding valve is rapidly opened, accumulated dust of the conical part is subjected to back flushing through the pressure airflow, and the pressure airflow can conduct more comprehensive back flushing on blocked dust. According to the method for quickly clearing the blockage of the conical part of the dry dedusting box, the blockage is quickly and effectively cleared, and smooth production is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical industry, and in particular to a method for quickly clearing blockage at a cone portion of a dry dust removal box. Background Art

[0002] Blast furnaces in the iron and steel metallurgical industry generate a large amount of dust during the production process. The existing dust removal methods are usually divided into wet dust removal and dry dust removal. In dry dust removal, the increase in smelting intensity, high oxygen enrichment rate and the use of economic raw materials cause the blast furnace top temperature to continue to decrease. After the blast furnace top temperature is reduced, the blast furnace gas is in a low temperature and high pressure state, and the steam in the gas is precipitated as mechanical water, resulting in the formation of compaction due to the high humidity of gas ash in the dry dust collector. During the ash unloading process, the box, ash conveying pipeline and ash storage bin are easily blocked, resulting in the dry dust removal system box pressure difference far exceeding the standard, forcing the blast furnace to take measures to control oxygen enrichment and maintain the top temperature, which will also cause the blast furnace output to decrease and the coke ratio to increase significantly, seriously affecting the normal production of the blast furnace. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for quickly clearing blockages in the cone part of a dry dust removal box in view of the above-mentioned deficiencies in the prior art, which can quickly and effectively clear blockages and ensure smooth production, and has the characteristics of being easy to use and highly practical.

[0004] The technical solution adopted by the present invention is: a method for quickly clearing blockage in the cone of a dry dust removal box, and the specific operating steps are as follows:

[0005] 1) First close the feed valve and discharge valve of the box, then open the sealing door of the cone of the box and let in nitrogen for purge to dilute the ash accumulated in the cone;

[0006] 2) Use a long-handled hammer to vibrate the outside of the box to loosen the dust clumps on the inner wall of the box so that the clumps can fall off;

[0007] 3) First remove the feed valve, insert a high-pressure air gun into the pipe where the feed valve is installed, and use the high-pressure air gun to inject high-pressure airflow into the cone to knock down the agglomerates. After the injection is completed, install the feed valve;

[0008] 4) First open the fluidizing valve of the silo pump to hold the pressure, then quickly open the feed valve to backflush the ash accumulated in the cone;

[0009] 5) Block the tee at the end of the ash conveying pipeline, input nitrogen into the ash conveying pipeline, and backflush the cone of the box through the ash conveying pipeline;

[0010] 6) Open the sealed door of the cone of the box, and use a cleaning shovel to manually clean the cone of the box and the inner wall of the box. When the blockage is cleared, quickly withdraw the cleaning shovel and close the cone of the box in time;

[0011] 7) Open the feed valve and discharge valve to resume the dust removal operation of the dry dust removal box.

[0012] Furthermore, when nitrogen is introduced, the nitrogen pressure is increased, and the frequency of blowing and ash conveying is adjusted. The box blowing pressure is adjusted from the original 450kpa to 560kpa. After the blowing is completed, the cone of the box is closed, the ash conveying pressure is adjusted from the original 380kpa to 560kpa and the intercepting orifice is removed.

[0013] Furthermore, before the spraying, the discharge valve is closed and the spraying is carried out in a continuous pressurizing manner.

[0014] Furthermore, the frequency of backflushing of the box is increased from once every 60 minutes to once every 45 minutes.

[0015] Furthermore, during the high-pressure air gun spraying process, an inclined rotating spraying method is adopted, and the spraying angle is 30° to 60°.

[0016] Furthermore, when the long-handled hammer is used to vibrate the outside of the box, water mist is transported into the inside of the box through the atomizer.

[0017] Beneficial Effects

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] The invention discloses a method for quickly clearing blockage in the cone of a dry dust removal box. First, nitrogen is introduced into the cone of the box for purging to dilute the dust accumulated in the cone and remove the dust that is easy to fall off the surface. Then, a long-handled hammer is used to vibrate the outside of the box to loosen the dust collected on the inner wall of the box so that the clumps can fall off. Then, a high-pressure airflow is injected into the cone of the box through a compressed air gun to knock down the clumps and achieve preliminary clearing. Then, the fluidization valve of the silo pump is opened to hold the pressure. When the pressure reaches a good level, the feed valve is quickly opened to clean the cone with the pressurized airflow. The accumulated ash is backblown, and the pressurized airflow can more comprehensively backblow the blocked dust. At the same time, nitrogen is also input through the ash conveying pipeline to increase the backblowing airflow, which is conducive to cleaning the nitrogen input on the ash conveying pipeline more cleanly. At this time, most of the blocked dust has been cleaned up. Finally, the cleaning shovel is used manually to remove the remaining blockages on the cone part of the box and the inner wall of the box. In this way, when the box is found to be blocked, the cone part of the box can be quickly cleared, thereby ensuring smooth production and effectively increasing the output of the blast furnace. It is easy to use and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0021] Among them: 1-box body, 2-box cone sealing door, 3-feed valve, 4-discharge valve, 5-ash conveying pipeline, 6-air inlet pipe, 7-tee pipe, 8-bin pump fluidizing valve, 9-nitrogen pump, 10-cone. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0023] See also Figure 1 As shown, a method for quickly clearing blockage in the cone of a dry dust removal box of the present invention, the specific operating steps are as follows:

[0024] 1) First, close the feed valve 3 and the discharge valve 4 of the box body, then open the sealing door 2 of the cone part of the box body and introduce nitrogen for purging to dilute the ash accumulated in the cone part 10;

[0025] 2) Use a long-handled hammer to vibrate the outside of the box 1 to vibrate the box 1 so that the dust ash agglomerated on the inner wall of the box 1 is loosened so that the agglomerates can fall off;

[0026] 3) First, remove the feed valve 3, insert a high-pressure air gun into the pipe where the feed valve 3 is installed, and use the high-pressure air gun to inject high-pressure airflow into the cone 10 to knock down the agglomerates. After the injection is completed, install the feed valve 3;

[0027] 4) First open the fluidizing valve 8 of the silo pump to hold the pressure, inject nitrogen into the box 1 through the nitrogen pump 9, and then quickly open the feed valve 3 to backflush the ash accumulated in the cone 10;

[0028] 5) A plugging plate is installed at the tee pipe 7 at the end of the ash conveying pipeline 5, and nitrogen is input into the ash conveying pipeline 5. The nitrogen flows in through the air inlet pipe 6, and back-blows the cone 10 of the box 1 through the ash conveying pipeline 5;

[0029] 6) Open the sealed door 2 of the cone of the box, and use a cleaning shovel to manually clean the cone of the box and the inner wall of the box 1. When the blockage is cleared, quickly withdraw the cleaning shovel and close the sealed door 2 of the cone of the box in time;

[0030] 7) Open the feed valve 3 and the discharge valve 4 to resume the dust removal operation of the dry dust removal box.

[0031] Specifically, when nitrogen is introduced, the nitrogen pressure is increased, and the frequency of blowing and ash conveying is adjusted. The blowing pressure of box 1 is adjusted from the original 450kpa to 560kpa. After the blowing is completed, the cone of the box is closed, the ash conveying pressure is adjusted from the original 380kpa to 560kpa, and the intercepting orifice is removed to increase the air pressure, so that the injection pressure is stronger and the impact force on the dust and scaling is greater, which is conducive to spraying the dust and scaling down and can be cleaned quickly. Removing the intercepting orifice makes the air flow larger, effectively preventing dust accumulation and further aggravating blockage.

[0032] Preferably, before spraying, the discharge valve 4 is closed and continuous pressurization is adopted to reduce the pressure difference in the box and ensure the air permeability of the box bag.

[0033] Furthermore, the backflushing frequency of the box is increased from once every 60 minutes to once every 45 minutes. By increasing the backflushing frequency, the pressure difference in the box is reduced, the air permeability of the bag in the box is ensured, and large-scale compaction of dust in the box is prevented.

[0034] Furthermore, during the high-pressure air gun spraying process, an inclined rotating spraying method is adopted, and the spraying angle is 30° to 60°. The inclined angle has a stronger spraying force on the accumulated dust, which is conducive to the falling of the accumulated dust.

[0035] Furthermore, when a long-handled hammer is used to vibrate the outside of the box, water mist is delivered to the inside of the box through an atomizer to soften the blockage, making it easier for the long-handled hammer to loosen it and facilitate subsequent quick cleaning.

[0036] The method for quickly clearing the blockage of the cone of a dry dust removal box of the present embodiment is to first blow nitrogen into the cone 10 of the box 1 to dilute the dust accumulated in the cone 10 and remove the dust that is easy to fall off the surface. Then, a long-handled hammer is used to vibrate the outside of the box 1 to loosen the dust collected on the inner wall of the box 1 so that the clumps can fall off. Then, a high-pressure airflow is injected into the cone 10 of the box through a compressed air gun to knock down the clumps, thereby achieving preliminary clearing. Then, the pressure is maintained by opening the fluidizing valve 8 of the silo pump. When the pressure reaches a good level, the pressure is quickly beaten. Open the feed valve 3, and use the pressure airflow to backflush the dust accumulated in the cone 10. The pressure airflow can backflush the blocked dust more comprehensively. At the same time, nitrogen is also input through the ash conveying pipeline. Increasing the backflush airflow is conducive to cleaning the nitrogen input on the ash conveying pipeline 5 more cleanly. At this time, most of the blocked dust has been cleaned up. Finally, the blockages remaining on the cone of the box and the inner wall of the box 1 are manually removed by using a cleaning shovel. In this way, when the box is found to be blocked, the cone of the box can be quickly cleared, thereby ensuring smooth production and effectively increasing the output of the blast furnace. The method for quickly clearing the blockage of the cone of a dry dust removal box of the present invention can quickly and effectively clear the blockage, ensure smooth production, and has the characteristics of being easy to use and highly practical.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for quickly clearing blockage in the cone of a dry dust removal box, characterized in that: The specific steps are as follows: 1) First close the feed valve and discharge valve of the box, then open the sealing door of the cone of the box and let in nitrogen for purge to dilute the ash accumulated in the cone; 2) Use a long-handled hammer to vibrate the outside of the box to loosen the dust clumps on the inner wall of the box so that the clumps can fall off; 3) First remove the feed valve, insert a high-pressure air gun into the pipe where the feed valve is installed, and use the high-pressure air gun to inject high-pressure airflow into the cone to knock down the agglomerates. After the injection is completed, install the feed valve; 4) First open the fluidizing valve of the silo pump to hold the pressure, then quickly open the feed valve to backflush the ash accumulated in the cone; 5) Block the tee at the end of the ash conveying pipeline, input nitrogen into the ash conveying pipeline, and backflush the cone of the box through the ash conveying pipeline; 6) Open the sealed door of the cone of the box, and use a cleaning shovel to manually clean the cone of the box and the inner wall of the box. When the blockage is cleared, quickly withdraw the cleaning shovel and close the sealed door of the cone of the box in time; 7) Open the feed valve and discharge valve to resume the dust removal operation of the dry dust removal box.

2. A method for quickly clearing blockage in the cone of a dry dust removal box according to claim 1, characterized in that: When nitrogen is introduced, the nitrogen pressure is increased, the frequency of blowing and ash conveying is adjusted, and the box blowing pressure is adjusted from the original 450kpa to 560kpa. After the blowing is completed, the cone of the box is closed, the ash conveying pressure is adjusted from the original 380kpa to 560kpa and the intercepting orifice is removed.

3. A method for quickly clearing blockage in the cone of a dry dust removal box according to claim 2, characterized in that: Before spraying, close the discharge valve and spray in a continuous pressurized manner.

4. A method for quickly clearing blockage in the cone of a dry dust removal box according to claim 1, characterized in that: Increase the backflush frequency of the box from once every 60 minutes to once every 45 minutes.

5. A method for quickly clearing blockage in the cone of a dry dust removal box according to claim 1, characterized in that: During the high-pressure air gun spraying process, an inclined rotating spraying method is adopted, and the spraying angle is 30° to 60°.

6. A method for quickly clearing blockage in the cone of a dry dust removal box according to claim 1, characterized in that: When the long-handled hammer is used to vibrate the outside of the box, water mist is transported into the inside of the box through the atomizer.

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