Anti-blocking device for pulverized coal injection pipeline

Abstract

The utility model relates to an anti-blocking device for a pulverized coal injection pipeline, which is structurally characterized in that a plurality of purging coal dropping pipelines are communicated with a pulverized coal storage bin, a pulverized coal storage pipe is arranged at the lower part of the pulverized coal storage bin, and a pulverized coal receiving container is connected to the lower end of the pulverized coal storage pipe; the gas conveying pipeline is communicated with the purging coal falling pipeline and the pulverized coal storage pipe at the same time, a first valve is arranged on the purging coal falling pipeline, a second valve is arranged on the pulverized coal storage pipe, and a third valve is arranged on the gas conveying pipeline communicated with the purging coal falling pipeline. A fourth valve is arranged on the gas conveying pipeline communicated with the pulverized coal storage pipe, and pulverized coal backflow prevention devices are arranged on a communication port between the gas conveying pipeline and the purging coal falling pipeline and a communication port between the gas conveying pipeline and the pulverized coal storage pipe respectively. According to the anti-blocking device for the pulverized coal injection pipeline, the problem of pulverized coal blocking in the pulverized coal injection pipeline can be effectively solved, and the safety and the reliability of the anti-blocking device for the pulverized coal injection pipeline are improved.

Description

Technical Field

[0001] The utility model relates to a coal powder injection pipeline, in particular to a coal powder injection pipeline anti-blocking device. Background Art

[0002] The current coal powder injection adopts the process of multi-tank cross-injection. When one injection tank is spraying, the other injection tanks are in the state of coal powder loading, preparation pressure, and waiting for injection. The coal powder stays in the injection pipeline for a long time. Due to the small particle size of the coal powder, it is continuously compacted under high pressure and blocked before the pneumatic ball valve of the coal powder injection pipeline. Or at the moment of the injection tank spraying, a large amount of coal powder passes through the pipeline quickly, which also causes the coal powder to be squeezed and thus blocks the pipeline.

[0003] There are two commonly used methods for unblocking the pipeline. One is to vibrate the coal powder injection pipeline for a long time to break up the accumulated coal powder in the pipeline and achieve the purpose of unblocking the pipeline. This method has low operating efficiency and takes too long to operate. In addition, the blocked points in the pipeline are not cleaned up, which can easily cause secondary blockage. The second method is to remove the pneumatic valve on the blocked pipeline and directly physically unblock the coal powder blocked in the pipeline. Although this method cleans the blocked points more cleanly, the disassembly and installation of the valve are also relatively cumbersome. During the cleaning period, the injection tank cannot be refilled, and part of the coal powder in the original tank needs to be discharged. The cleaning work is arduous and affects the subsequent coal powder injection work.

[0004] At present, there is also a method of adding a purge fluidization pipeline to the coal powder injection pipeline and using gas to purge the pipeline to solve the problem of less serious blockage. When the blockage in the pipeline is more serious, purging it will compress the coal powder in the pipeline more and more. The pressure that the pipeline can withstand is limited. When it reaches the critical value, not only can it no longer be purged and pressurized, but it will also cause the reflux of coal powder, resulting in the purge pipeline and gas storage tank being full of coal powder and unable to be cleaned. When other equipment is pressurized and purged, the coal powder will flow with it, resulting in a series of risks. This method cannot perfectly solve the problem of pipeline blockage in various situations, and it will also cause new safety problems, and still needs further improvement. Utility Model Content

[0005] The utility model aims to provide a device for preventing coal powder injection pipeline from being blocked, so as to solve the problem that the existing method for clearing coal powder injection pipeline cannot effectively solve the pipeline blockage.

[0006] The utility model is implemented as follows: a device for preventing coal powder injection pipeline from being blocked, comprising a coal powder storage bin, a plurality of purging and dropping coal pipelines for being connected to the coal powder injection pipeline are connected to the coal powder storage bin, a coal powder storage pipe is provided at the lower part of the coal powder storage bin, a coal powder receiving container is connected to the lower end of the coal powder storage pipe, a gas delivery pipeline is connected to the purging and dropping coal pipeline and the coal powder storage pipe at the same time, a first valve is provided on the purging and dropping coal pipeline, a second valve is provided on the coal powder storage pipe, a third valve is provided on the gas delivery pipeline connected to the purging and dropping coal pipeline, a fourth valve is provided on the gas delivery pipeline connected to the coal powder storage pipe, and coal powder backflow prevention devices are respectively provided on the connecting port between the gas delivery pipeline and the purging and dropping coal pipeline and on the connecting port between the gas delivery pipeline and the coal powder storage pipe.

[0007] As a further improvement of the structure of the anti-blocking device for coal powder injection pipeline of the utility model, the coal powder backflow prevention device includes a baffle plate arranged on the connecting port, a plurality of jet holes are opened on the baffle plate, a jet pipe is arranged on the jet holes, and a plurality of umbrella-shaped coal blocking parts are arranged on the baffle plate, and the umbrella-shaped coal blocking parts and the jet pipe are both located on a side of the baffle plate away from the gas delivery pipeline.

[0008] As a further improvement of the structure of the anti-blocking device for coal powder injection pipeline of the utility model, the gas delivery pipeline includes a gas delivery main pipe and a plurality of gas delivery branches, the gas delivery branches are connected to the coal purge pipeline or the coal powder storage pipe, and a fifth valve is arranged on the gas delivery main pipe.

[0009] As a further improvement of the structure of the anti-blocking device for the coal powder injection pipeline of the utility model, there are two coal blowing and dropping pipelines, and the two coal blowing and dropping pipelines are connected to the coal powder injection pipeline in sequence.

[0010] As a further improvement of the structure of the anti-clogging device for coal powder injection pipeline of the utility model, an elbow is arranged between the coal blowing and dropping pipeline and the coal powder receiving container.

[0011] As a further improvement to the structure of the anti-blocking device for coal powder injection pipeline of the utility model, the coal powder storage bin is a spherical container.

[0012] The utility model discloses a coal powder injection pipeline anti-blocking device, which uses gas purging, pressurization, and reflux to process the blocked position in the coal powder injection pipeline, and repeats the process for many times, so that the coal powder at the blocked point can be completely cleaned, thereby improving the cleaning effect and extending the time of secondary blockage, which not only saves labor costs and energy costs, but also improves the stability and reliability of the injection process system. After the blocked position is cleaned, the coal powder injection pipeline can be continuously purged and fluidized by gas to ensure the activity of the coal powder in the pipeline, greatly extending the time of re-blocking and reducing the probability of pipeline blockage. When dealing with pipeline blockage problems, the injection tank can be refilled and pressurized without affecting it. After the blockage problem is solved, the coal powder injection operation can be carried out in time, avoiding the risk of coal shortage in the blast furnace, ensuring the sustainable injection of coal powder, and reducing the combustion and use cost of blast furnace operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model.

[0014] Figure 2 It is a structural diagram of a pulverized coal backflow prevention device of the utility model.

[0015] Figure 3 It is a reference diagram for use of the present utility model.

[0016] In the figure: 1. Coal powder storage bin; 2. Purge coal pipeline; 3. Coal powder storage pipe; 4. Coal powder discharge pipe; 5. Coal powder receiving container; 6. Gas delivery main pipe; 7. Gas delivery branch pipe; 8. Coal powder backflow prevention device; 9. First valve; 10. Second valve; 11. Third valve; 12. Fourth valve; 13. Fifth valve; 14. Blowing tank; 15. Coal powder blowing pipe; 16. Sixth valve; 17. Seventh valve; 18. Eighth valve; 8-1. Baffle; 8-2. Jet hole; 8-3. Jet pipe; 8-4. Umbrella-shaped coal baffle. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model will be further described below in conjunction with the accompanying drawings.

[0018] like Figure 1As shown, the utility model includes a coal powder storage bin 1, on which are connected a plurality of purging and dropping coal pipes 2 for communicating with coal powder blowing pipes 15, a coal powder storage pipe 3 is provided at the lower part of the coal powder storage bin 1, a coal powder receiving container 5 is connected to the lower end of the coal powder storage pipe 3, a gas delivery pipeline is simultaneously connected with the purging and dropping coal pipe 2 and the coal powder storage pipe 3, a first valve 9 is provided on the purging and dropping coal pipe 2, a second valve 10 is provided on the coal powder storage pipe 3, a third valve 11 is provided on the gas delivery pipeline connected with the purging and dropping coal pipe 2, a fourth valve 12 is provided on the gas delivery pipeline connected with the coal powder storage pipe 3, and coal powder backflow prevention devices 8 are respectively provided on the connecting ports between the gas delivery pipeline and the purging and dropping coal pipe 2 and on the connecting ports between the gas delivery pipeline and the coal powder storage pipe 3.

[0019] like Figure 3 As shown, the utility model is connected to the coal powder injection pipe 15. When the coal powder injection pipe 15 of the injection tank 14 is blocked, the utility model is used to deal with it. Through the cooperation of various valves, the gas enters the coal powder injection pipe 15 through the gas transmission pipeline and the purging and dropping coal pipeline 2, and the blocked part inside is purged and pressurized. Then, a large amount of coal powder in the coal powder injection pipe 15 falls back into the coal powder storage bin 1 and the coal powder storage pipe 3 through the purging and dropping coal pipeline 2. Then, the coal powder in the coal powder storage bin 1 and the coal powder storage pipe 3 is discharged into the coal powder receiving container 5. The above steps are repeated to purge the coal powder injection pipe 15 for multiple times, flush out the coal powder blocked in the coal powder injection pipe 15, and collect the coal powder in the coal powder receiving container 5. The coal powder can be reused.

[0020] In addition, the third valve 11 and the fourth valve 12 can be opened a small part to continuously purge and fluidize the coal powder injection pipe 15 with conveying gas to prevent blockage in the coal powder injection pipe 15. At the same time, the coal powder entering the coal powder storage bin 1 and the coal powder storage pipe 3 can be fluidized to prevent backlog.

[0021] The pulverized coal storage bin 1 is a spherical container, which can eliminate dead corners in the bin and prevent the accumulation of pulverized coal from causing safety risks.

[0022] An elbow is provided between the coal purging and dropping pipeline 2 and the coal powder receiving container 5. The use of the elbow can eliminate dead corners in the pipeline and prevent coal powder from accumulating.

[0023] The gas delivery pipeline includes a gas delivery main pipe 6 and a plurality of gas delivery branches 7. The gas delivery branch pipes 7 are connected to the coal purge pipeline 2 or the coal powder storage pipe 3. A fifth valve 13 is provided on the gas delivery main pipe 6. The gas delivery main pipe 6 is connected to a high-pressure gas source to deliver gas to each gas delivery branch pipe 7. The gas source is air or nitrogen.

[0024] In order to prevent coal powder from entering the gas delivery pipeline, coal powder backflow prevention devices 8 are respectively provided on the connecting opening between the gas delivery branch pipe 7 and the purging coal pipeline 2 and on the connecting opening between the gas delivery branch pipe 7 and the coal powder storage pipe 3.

[0025] like Figure 2 As shown, the pulverized coal backflow prevention device 8 includes a baffle 8-1 arranged on the connecting port, the baffle 8-1 covers the entire connecting port, a plurality of jet holes 8-2 are opened on the baffle 8-1, the gas delivery branch pipe 7 is connected with other pipelines through the jet holes 8-2, and the high-pressure gas in the gas delivery branch pipe 7 is ejected through the jet holes 8-2. At the same time, a jet pipe 8-3 is arranged on each jet hole 8-2, and a plurality of umbrella-shaped coal blocking members 8-4 are arranged on the baffle 8-1. The umbrella-shaped coal blocking member 8-4 and the jet pipe 8-3 are both located on the side of the baffle 8-1 away from the gas delivery pipeline, and the jet pipe 8-3 and the umbrella-shaped coal blocking member 8-4 work together to prevent the pulverized coal from flowing back.

[0026] The distance between the edge of the umbrella-shaped coal baffle 8-4 and the baffle 8-1 is smaller than the distance between the port of the jet pipe 8-3 and the baffle 8-1. The gas can flow out through the gap between the jet pipe 8-3 and the umbrella-shaped coal baffle 8-4 and the baffle 8-1. When the coal powder wants to enter the gas delivery branch pipe 7, it will first be blocked by the umbrella-shaped coal baffle 8-4. Even if the coal powder enters the gap between the umbrella-shaped coal baffle 8-4 and the baffle 8-1, it still has to pass through the jet pipe 8-3 protruding from the baffle 8-1 before it can enter the jet hole 8-2. This structure can greatly reduce the probability of coal powder flowing back into the gas delivery branch pipe 7.

[0027] In addition, the gas in the gas delivery branch pipe 7 needs to continuously purge and pressurize the coal powder injection pipe 15 through the coal powder backflow prevention device 8. The gas passes through the injection hole 8-2 and the injection pipe 8-3, bypasses the umbrella-shaped coal blocking device, and enters the purge and coal drop pipeline. The falling coal powder falls on the umbrella-shaped coal blocking device and the injection pipe 8-3. The gas injection disturbance will take away the coal powder on the umbrella-shaped coal blocking device and the injection pipe 8-3, and there will be no accumulation. At the same time, the coal powder will not flow back to the gas delivery branch pipe 7 and the gas delivery main pipe 6.

[0028] For the anti-clogging device for the coal powder injection pipe 15 of the utility model, there can be multiple blowing and dropping coal pipes 2. Specifically, there are two blowing and dropping coal pipes 2. The two blowing and dropping coal pipes 2 are connected to the coal powder injection pipe 15 in sequence. The coal powder injection pipe 15 is purged at multiple points through the two blowing and dropping coal pipes 2. The two blowing and dropping coal pipes 2 and the coal powder storage bin 1 form a Y-shaped structure.

[0029] like Figure 3As shown, when the two purging and dropping coal pipes 2 are connected to the coal powder injection pipe 15, a sixth valve 16 and a seventh valve 17 are respectively arranged on the coal powder injection pipe 15 in front of the two purging and dropping coal pipes 2 and between the two purging and dropping coal pipes 2, and an eighth valve 18 is arranged at the rear of the coal powder injection pipe 15.

[0030] The usage of the utility model is as follows:

[0031] When the pulverized coal injection pipe 15 of the injection tank 14 is blocked, first close the seventh valve 17 and the eighth valve 18, open the sixth valve 16, close the fourth valve 12, close the first valve 9 and the second valve 10; then open the fifth valve 13, the gas is distributed to each gas delivery branch pipe 7 through the gas delivery main pipe 6, open the third valve 11, the gas enters the pulverized coal injection pipe 15 through the purge and discharge pipe, and purges and pressurizes the blocked part; then close the third valve 11, open the first valve 9, and the pulverized coal injection pipe 15 is A large amount of coal powder inside falls back into the coal powder storage bin 1 and the coal powder storage pipe 3 through the purging and dropping pipe; close the first valve 9, open the second valve 10, and discharge the coal powder in the coal powder storage bin 1 and the coal powder storage pipe 3 through the coal powder discharge pipe 4 to the coal powder receiving container 5; close the second valve 10, open the third valve 11, and continue to purge and pressurize the blocked part; then close the third valve 11, open the first valve 9, and a large amount of coal powder in the coal powder injection pipe 15 falls back into the coal powder storage bin 1 and the coal powder storage pipe 3 through the purging and dropping pipe;

[0032] The above steps are repeated until the blocked coal powder in the coal powder injection pipe 15 is flushed away, and the compacted coal powder is collected in the coal powder receiving container 5, and the coal powder in the coal powder receiving container 5 is manually transported to the belt or raw coal bin for reuse.

[0033] After the blockage problem of the coal powder injection pipe 15 is solved, close the second valve 10, open the third valve 11, the first valve 9 and the fourth valve 12, fully open the first valve 9, and open a small part of the third valve 11 and the fourth valve 12 to continuously purge and fluidize the coal powder injection pipe 15 with gas to prevent the occurrence of blockage problems in the pipeline. At the same time, fluidize the coal powder entering the coal powder storage bin 1 and the coal powder storage pipe 3 to prevent backlog.

[0034] The utility model uses gas purging, pressurization, and reflux to process the blocked position in the coal powder injection pipe 15, and repeats it many times to completely clean the coal powder at the blocked point, improve the cleaning effect, and extend the time of secondary blockage, which not only saves labor costs and energy costs, but also improves the stability and reliability of the injection process system. After the blocked position is cleaned, the coal powder injection pipe 15 can also be continuously purged and fluidized with gas to ensure the activity of the coal powder in the pipeline, greatly extend the time of re-blocking, and reduce the probability of pipeline blockage.

[0035] When the utility model is used to deal with the problem of pipeline blockage, the injection tank 14 can perform the operations of replenishing materials and preparing pressure. After the blockage problem is solved, the coal powder injection operation can be carried out in time, avoiding the risk of coal shortage in the blast furnace, ensuring the sustainable injection of coal powder, and reducing the combustion and use cost of the blast furnace operation. In addition, after the compacted coal powder in the coal powder injection pipe 15 is discharged from the system, it is subjected to secondary treatment and reused, which not only avoids the situation where the compacted coal powder blocks the coal powder injection pipe 15 again, but also does not waste coal resources.

Claims

1. A device for preventing clogging of a pulverized coal injection pipeline, characterized in that: The invention comprises a coal powder storage bin, on which a plurality of purging and dropping coal pipes for being connected with the coal powder injection pipe are connected, a coal powder storage pipe is provided at the lower part of the coal powder storage bin, a coal powder receiving container is connected to the lower end of the coal powder storage pipe, a gas delivery pipe is connected with the purging and dropping coal pipe and the coal powder storage pipe at the same time, a first valve is provided on the purging and dropping coal pipe, a second valve is provided on the coal powder storage pipe, a third valve is provided on the gas delivery pipe connected with the purging and dropping coal pipe, a fourth valve is provided on the gas delivery pipe connected with the coal powder storage pipe, and coal powder backflow prevention devices are respectively provided on the connecting port between the gas delivery pipe and the purging and dropping coal pipe and on the connecting port between the gas delivery pipe and the coal powder storage pipe.

2. The anti-blocking device for coal powder injection pipeline according to claim 1 is characterized in that: The pulverized coal backflow prevention device includes a baffle plate arranged on the connecting port, a plurality of gas injection holes are opened on the baffle plate, a gas injection pipe is arranged on the gas injection holes, a plurality of umbrella-shaped coal blocking parts are arranged on the baffle plate, and the umbrella-shaped coal blocking parts and the gas injection pipe are both located on a side of the baffle plate away from the gas delivery pipeline.

3. The anti-blocking device for coal powder injection pipeline according to claim 1, characterized in that: The gas delivery pipeline includes a gas delivery main pipe and a plurality of gas delivery branches, the gas delivery branches are connected to the coal purge pipeline or the coal powder storage pipe, and a fifth valve is arranged on the gas delivery main pipe.

4. The anti-clogging device for coal powder injection pipeline according to claim 1, characterized in that: There are two coal blowing and dropping pipelines in total, and the two coal blowing and dropping pipelines are connected to the coal powder injection pipeline in sequence.

5. The anti-clogging device for coal powder injection pipeline according to claim 1, characterized in that: An elbow is provided between the coal-purging pipeline and the coal powder receiving container.

6. The anti-clogging device for coal powder injection pipeline according to claim 1, characterized in that: The pulverized coal storage bin is a spherical container.

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