Blockage-removing pulverized coal back-blowing collecting device for coal injection gun

Abstract

The utility model relates to the technical field of ferrous metallurgy, in particular to a coal injection gun unblocking pulverized coal blowback collecting device which comprises a pulverized coal collecting barrel, a filter bag, a blowback barrel, a first air inlet pipe, a diffusing pipe, a coal inlet pipe, a second air inlet pipe, a first coal outlet pipe and a second coal outlet pipe. The pulverized coal collecting barrel is used for collecting pulverized coal, the filter bag is used for filtering gas exhausted by the coal injection gun, the diffusing pipe is used for exhausting and pressure relief, the back-blowing barrel is used for back-blowing high-pressure gas, and the high-pressure gas is used for blowing the filter bag, so that the problem of environmental pollution caused by the pulverized coal injection gun to air-blown pulverized coal is solved, and the risk of explosion caused by pulverized coal enrichment in the working environment is avoided; and the risk of pulverized coal explosion caused by overhigh pressure in the pulverized coal collecting barrel is avoided, the problem that the pulverized coal in the barrel body is easy to block a coal discharge pipeline when the pulverized coal collecting barrel discharges the pulverized coal is solved, and meanwhile, the service life of the filter bag is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of iron and steel metallurgy, in particular to a coal powder back-blowing and collecting device for clearing blockage of a coal injection gun. Background Art

[0002] Pulverized coal injection in blast furnace is to inject finely ground coal directly into the furnace from the tuyere of blast furnace to replace coke to provide heat and reduce the cost of pig iron, thus reducing the coke ratio and pig iron cost. It is a major technological revolution in modern blast furnace smelting. However, in actual production, due to frequent blockage of coal gun system, it will not only cause insufficient hourly coal to cause furnace cooling, but also cause problems such as uneven heat distribution in blast furnace and poor gas flow distribution, which seriously affect the smooth operation of blast furnace. The main reasons for the blockage of coal gun are as follows: ① The raw coal at the production site contains more stones, straw, plastic and other debris, which are difficult to grind. After vibration screening, there is still a small part of residue, which is very easy to cause coal gun blockage; ② The moisture content of coal powder is high, the fluidity is poor, the cohesion between coal powder particles is increased, and it is easy to agglomerate, which is easy to cause coal gun blockage; ③ The raw coal grindability coefficient is low, the equipment is aging, etc., which makes the coal powder coarse after screening, which is easy to cause blast furnace coal gun blockage.

[0003] When the coal injection gun is blocked, Chinese patent CN217149221U discloses a coal powder recovery device for treating the blockage of the blast furnace coal injection gun. The treatment process is: close the coal gun, cut off the connection between the furnace and the coal injection pipeline, and then open the pressure relief valve on the coal injection branch pipe to discharge the pressure in the air. Due to the increase in pressure difference, the blocked coal powder in the pipeline will enter the filter bag through the quick connector, single-head wire and welded pipe. By removing the cable tie, the coal powder in the filter bag can be poured out. This device solves the problem of environmental pollution and waste of coal powder caused by coal powder injection into the air. However, since the coal powder is directly sprayed into the filter bag for a long time, the air permeability of the filter bag will be poor. The pressure in the filter bag increases during injection, which is easy to cause the risk of dust explosion. Utility Model Content

[0004] The utility model aims to provide a coal powder back-blowing collection device for clearing blockage of a coal-injection gun, which can collect the sprayed coal powder when the blockage of the spray gun is eliminated. The utility model can filter the coal-containing gas through the filter bag, eliminate the environmental pollution, coal powder waste and dust explosion hazards caused by the coal discharge process, and solve the problem of coal powder blockage in the collection device through the back-blowing collection device.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A coal powder back-blowing collection device for clearing blockage in a coal injection gun comprises a coal powder collecting tube, a filter bag, a back-blowing tube, a first air inlet pipe, a venting pipe, a coal inlet pipe, a second air inlet pipe, a first coal outlet pipe and a second coal outlet pipe.

[0007] The above-mentioned coal-injection gun blockage-clearing coal powder back-blowing collection device, the coal powder collecting cylinder is divided into two parts: a cylinder body and a cylinder cover, the cylinder body and the cylinder cover are connected by a flange, the cylinder cover is provided with a first air inlet pipe and a discharge pipe, the cylinder body is provided with a circular ring-shaped support frame, the side wall is connected to a coal inlet pipe, the bottom end of the cylinder body is conical, and the bottom is connected to a first coal outlet pipe.

[0008] The filter bag includes a filter bag body, a frame and a circular ring bracket. The filter bag body is sleeved on the outer surface of the frame. The frame includes multiple steel rings and multiple vertical rods. The longitudinal section of the vertical rod is "L"-shaped and the interior is a hollow structure. The vertical part of the vertical rod is provided with multiple circular holes. The circular holes are located on the outer side wall of the vertical part of the vertical rod that contacts the filter bag body. The outer side wall of the transverse part of the vertical rod is connected to the lower end face of the circular ring bracket. The pipe openings of the transverse part of the vertical rod are all connected to the side walls of the ventilation pipe. The pipe opening at one end of the ventilation pipe connected to the vertical rod is a closed end, and the other end is connected to the first air inlet pipe through a hose.

[0009] The above-mentioned coal powder back-blowing collection device for clearing blockage of the coal injection gun has the upper end of the back-blowing tube connected to the first coal outlet pipe and the lower end connected to the second coal outlet pipe. The bottom end of the back-blowing tube is conical, and the side wall of the conical bottom end is connected to the second air inlet pipe.

[0010] The above-mentioned coal powder back-blowing collection device for clearing blockage in the coal injection gun, the second air intake pipe is provided with a valve, the valve shaft end of the valve is connected to the lower side wall of the second air intake pipe, when the valve is opened, the angle between the valve and the lower side wall of the second air intake pipe is an obtuse angle, and the valve is provided with a return spring.

[0011] The above-mentioned coal powder back-blowing and collecting device for clearing blockage of the coal injection gun has valves on the first air inlet pipe, the vent pipe, the coal inlet pipe, the second air inlet pipe, the first coal outlet pipe and the second coal outlet pipe.

[0012] The beneficial effects of adopting the above technical solution are:

[0013] The utility model provides a filter bag to filter the gas discharged from the coal-injection gun, so that the gas without coal powder is discharged from the vent pipe, thereby solving the problem of environmental pollution caused by coal-injection gun spraying coal powder into the air, avoiding the risk of explosion caused by coal powder enrichment in the working environment, and at the same time, the venting effect of the vent pipe also avoids the risk of coal powder explosion caused by excessive pressure inside the coal-injection collection tube. The coal powder is collected by the coal-injection collection tube, and the processed coal powder can be reused, thereby avoiding the waste of coal powder resources. When the coal-injection gun is cleared, the gas sprayed from the coal-injection gun is discharged into the coal-injection collection tube, and is not directly discharged into the filter bag. The high-pressure gas is directly sprayed into the filter bag body through the circular hole on the frame, which can blow off the coal powder attached to the surface of the filter bag body and avoid the coal powder from clogging the filter bag pores, thereby extending the service life of the filter bag. The high-pressure gas is back-blown by the back-blowing tube, thereby solving the problem that the coal powder in the cylinder body is easy to clog the coal discharge pipe when the coal powder is discharged from the coal-injection collection tube.

[0014] The utility model has a simple structure, is environmentally friendly and energy-saving, solves the clogging problem of the coal injection gun, and also takes into account the clogging problem of the coal powder collecting tube and the service life of the filter bag, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] Figure 1 This is a schematic diagram of the structure of the utility model (not drawn to scale);

[0017] Figure 2 It is a schematic diagram of the enlarged structure of the A part of the utility model (not drawn to scale);

[0018] Figure 3 This is a cross-sectional view of the utility model in the direction of B (not drawn to scale)

[0019] Figure 4 It is a schematic diagram of the enlarged structure of the C portion of the utility model (not drawn to scale).

[0020] In the figure: 1. quick connector; 2. coal powder collecting cylinder; 3. filter bag; 4. backblowing cylinder; 5. first air inlet pipe; 6. vent pipe; 7. coal inlet pipe; 8. second air inlet pipe; 9. first coal outlet pipe; 10. second coal outlet pipe; 21. cylinder body; 22. cylinder cover; 23. angle steel; 24. support frame; 31. filter bag body; 33. circular bracket; 34. nut; 321. steel ring; 322. vertical rod; 331. ventilation pipe; 332. hose; 41. valve; 42. return spring; 51. first air inlet pipe valve; 61. vent pipe valve; 71. coal inlet pipe valve; 81. second air inlet pipe valve; 91. first coal outlet pipe valve; 101. second coal outlet pipe valve. DETAILED DESCRIPTION

[0021] Example

[0022] like Figure 1-4 As shown, the utility model includes a coal powder collecting cylinder 2, a filter bag 3, a backblowing cylinder 4, a first air inlet pipe 5, a venting pipe 6, a coal inlet pipe 7, a second air inlet pipe 8, a first coal outlet pipe 9 and a second coal outlet pipe 10.

[0023] The coal powder collecting cylinder 2 is divided into two parts, namely a cylinder body 21 and a cylinder cover 22. The cylinder body 21 and the cylinder cover 22 are connected by a flange. The cylinder cover is provided with a first air inlet pipe 5 and a discharge pipe 6. A plurality of angle steels 23 are welded around the inner wall of the cylinder body 21. A circular ring-shaped support frame 24 is welded above the angle steel 23. The side wall of the cylinder body 21 is connected with a coal inlet pipe 7, and the coal inlet pipe 7 is located below the angle steel 23. The bottom end of the cylinder body 21 is conical, and the bottom is connected with a first coal outlet pipe 9.

[0024] The filter bag 3 includes a filter bag body 31, a frame and a circular ring bracket 33. The filter bag body 31 is sleeved on the outer surface of the frame. The frame includes a plurality of steel rings 321 and a plurality of vertical rods 322. The steel rings 321 and the vertical rods 322 are welded and connected. The longitudinal section of the vertical rods 322 is "L"-shaped and has a hollow structure inside. The vertical portion of the vertical rods 322 is provided with a circular hole. The circular hole is located on the outer side wall of the vertical portion of the vertical rods 322 that contacts the filter bag body 31. The outer side wall of the horizontal portion of the vertical rods 322 is connected to the lower end face of the circular ring bracket 33. The pipe openings of the horizontal portion of the vertical rods 322 are all connected to the side walls of the ventilation pipes 331. One end of the air pipe 331 connected to the vertical rod 322 is a closed end, and the other end is connected to the first air inlet pipe 5 through a hose 332. The above arrangement allows the high-pressure gas entering from the first air inlet pipe 5 to enter the interior of the vertical rod 322 through the ventilation pipe 331, and be blown out through the circular hole on the side wall of the vertical rod 322, thereby blowing the filter bag body 31. By switching the first air inlet pipe valve 51, the filter bag body 31 is shaken, thereby causing the coal powder on the filter bag body 31 to fall off. At the same time, the high-pressure gas directly blows the filter bag body 31 through the circular hole, and can also blow off the coal powder in the pores inside the filter bag body 31, thereby ensuring the air permeability of the filter bag body 31 and extending the service life of the filter bag body 31. The circular bracket 33 is connected to one side of the opening of the filter bag body. The circular bracket 33, one side of the opening of the filter bag body and the support frame 24 are connected by a nut 34 to ensure that the filter bag body 31 will not fall off the frame. When the filter bag body 31 needs to be replaced, the flange between the cylinder 21 and the cylinder cover 22 is opened, the cylinder cover 22 is removed, and the nut 34 is unscrewed to remove the filter bag body 31. The first air inlet pipe 5 is connected to the ventilation pipe 331 by a hose 332, which makes it easier to take and put the filter bag body 31.

[0025] When the coal injection gun is clearing coal powder, the sprayed coal powder adheres to the filter bag 3 or falls into the bottom of the cylinder 21. The gas without coal powder is discharged through the vent pipe 6, which prevents environmental pollution. The coal powder is collected by the cylinder 21, avoiding the risk of explosion caused by coal powder enrichment in the working environment. At the same time, the venting effect of the vent pipe 6 also avoids the risk of coal powder explosion caused by excessive pressure inside the cylinder 21.

[0026] The upper end of the back-blowing tube 4 is connected to the first coal outlet pipe 9, and the lower end is connected to the second coal outlet pipe 10. The bottom end of the back-blowing tube 4 is conical, and a second air inlet pipe 8 is connected to the side wall of the conical bottom end; when the coal powder collecting tube 2 is blocked by coal powder, high-pressure gas can be back-blown through the second air inlet pipe 8 to clear the blockage.

[0027] The air outlet end of the second air inlet pipe 8 is inclined upward and is provided with a valve 41. The valve shaft end of the valve 41 is connected to the lower side wall of the second air inlet pipe 8. When the valve 41 is opened, the angle between the valve 41 and the lower side wall of the second air inlet pipe 8 is an obtuse angle, ensuring that the high-pressure gas entering from the second air inlet pipe 8 rushes upward into the first coal outlet pipe 9, so as to clear the coal powder blocked at the bottom end of the cylinder 21. A return spring 42 is provided on the valve 41; when the second air inlet pipe 8 takes in air, the valve 41 will be pushed open by the gas to close the second air inlet pipe valve 81, and the valve 41 will be reset under the drive of the return spring 42.

[0028] The first air inlet pipe 5, the vent pipe 6, the coal inlet pipe 7, the second air inlet pipe 8, the first coal outlet pipe 9 and the second coal outlet pipe 10 are all provided with valves, which are the first air inlet pipe valve 51, the vent pipe valve 61, the coal inlet pipe valve 71, the second air inlet pipe valve 81, the first coal outlet pipe valve 91 and the second coal outlet pipe valve 101.

[0029] A quick connector 1 is provided on one side of the coal inlet pipe 7 outside the coal powder collecting tube 2, and the quick connector 1 is used for quickly connecting a blocked coal injection gun.

[0030] When the coal injection gun is clearing coal powder:

[0031] Method 1: Connect the coal injection gun to the quick connector 1, open the vent pipe valve 61 and the coal inlet pipe valve 71, close the other valves, open the coal injection gun to exhaust (coal), and blow the gas with coal powder into the cylinder 21. Due to the filtering effect of the filter bag 3, the coal powder finally falls on the bottom of the cylinder 21, and the vent pipe 6 discharges the gas without coal powder to release the pressure inside the cylinder 21.

[0032] Method 2, connect the coal injection gun to the quick connector 1, open the first air inlet pipe valve 51 and the coal inlet pipe valve 71, close the other valves, use high-pressure gas to back-blow and pressurize the inside of the cylinder 21 through the first air inlet pipe 5, open the vent pipe valve 61, and while releasing the pressure, due to the continuous air intake of the first air inlet pipe 5, a siphon principle is generated on the cylinder 21, so that a negative pressure is generated in the cylinder 21, and the coal powder blocked in the coal injection gun is further sucked out. Pressurizing once may not have the effect of unblocking the coal injection gun, and it can be repeated many times until the blocked coal injection gun is unblocked.

[0033] When a certain amount of coal powder accumulates in the coal powder collecting tube 2 and needs to be discharged:

[0034] Method 1: Open the first air inlet pipe valve 51, the first coal outlet pipe valve 91 and the second coal outlet pipe valve 101, close the remaining valves, and use high-pressure gas to intermittently back-blow the inside of the cylinder 21 through the first air inlet pipe 5 (the first air inlet pipe valve 51 can be opened and closed every 5-10 seconds) to make the filter bag body 31 vibrate, thereby blowing off the coal powder attached to the filter bag 3 and causing the coal powder to fall into the bottom of the cylinder 21. The coal powder at the bottom of the cylinder 21 naturally flows out through the first coal outlet pipe valve 91 and the second coal outlet pipe valve 101.

[0035] Method 2, open the first coal outlet pipe valve 91 and the second coal outlet pipe valve 101. Under normal circumstances, the coal powder will flow out naturally due to gravity. However, the coal powder that blocks the coal injection gun often contains debris, coarse particles or high water content. After this type of coal powder enters the cylinder 21, it will be blocked at the first coal outlet pipe valve 91 and cannot be discharged. At this time, the dispersion pipe valve 61, the second air inlet pipe valve 81, the first coal outlet pipe valve 91 and the second coal outlet pipe valve 101 can be opened, and high-pressure gas can be introduced through the second air inlet pipe 8 to back-blow the valve port of the first coal outlet pipe valve 91, so that the blocked coal powder can be discharged smoothly, and then the second air inlet pipe valve 81 can be closed. When the coal powder in the cylinder 21 is discharged, the second air inlet pipe valve 81 is opened again to blow out the coal powder that falls into the second air inlet pipe 8 during the back-blow process.

[0036] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coal powder back-blowing collection device for clearing blockage of a coal injection gun, comprising a coal powder collection tube (2), a filter bag (3), a back-blowing tube (4), a first air inlet pipe (5), a venting pipe (6), a coal inlet pipe (7), a second air inlet pipe (8), a first coal outlet pipe (9) and a second coal outlet pipe (10), characterized in that: The coal powder collecting cylinder (2) is divided into two parts, namely a cylinder body (21) and a cylinder cover (22). The cylinder body (21) and the cylinder cover (22) are connected by a flange. The cylinder cover (22) is provided with a first air inlet pipe (5) and a discharge pipe (6). A circular ring-shaped support frame (24) is provided inside the cylinder body (21). The side wall is connected to a coal inlet pipe (7). The bottom end of the cylinder body (21) is conical and is connected to a first coal outlet pipe (9). The filter bag (3) comprises a filter bag body (31), a frame and a circular ring frame (33). The filter bag body (31) is sleeved on the outer surface of the frame. The frame comprises a plurality of steel rings (321) and a plurality of vertical rods ( 322), the vertical rod (322) has an "L"-shaped longitudinal section and a hollow structure inside, a plurality of circular holes are provided in the vertical portion of the vertical rod (322), and the circular holes are located on the outer wall of the vertical portion of the vertical rod (322) contacting the filter bag body (31), the outer wall of the transverse portion of the vertical rod (322) is connected to the lower end surface of the circular bracket (33), the pipe openings of the transverse portion of the vertical rod (322) are all connected to the side wall of the ventilation pipe (331), one end of the ventilation pipe (331) connected to the vertical rod (322) is a closed end, and the other end is connected to the first air inlet pipe (5) through a hose (332).

2. The device for collecting coal powder back-blowing for clearing blockage of coal injection gun according to claim 1 is characterized by: The upper end of the back-blowing cylinder (4) is connected to the first coal outlet pipe (9), and the lower end is connected to the second coal outlet pipe (10). The bottom end of the back-blowing cylinder (4) is conical, and the side wall of the conical bottom end is connected to the second air inlet pipe (8).

3. The device for collecting coal powder back-blowing for clearing blockage of coal injection gun according to claim 1 or 2, characterized in that: The second air intake pipe (8) is provided with a valve (41), the valve shaft end of the valve (41) is connected to the lower side wall of the second air intake pipe (8), when the valve (41) is opened, the angle between the valve (41) and the lower side wall of the second air intake pipe (8) is an obtuse angle, and the valve (41) is provided with a return spring (42).

4. The device for collecting coal powder back-blowing for clearing blockage of coal injection gun according to claim 1 is characterized by: Valves are provided on the first air inlet pipe (5), the venting pipe (6), the coal inlet pipe (7), the second air inlet pipe (8), the first coal outlet pipe (9) and the second coal outlet pipe (10).

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