Anti-backfire device for blast furnace

Abstract

The utility model provides an anti-backfire device for a blast furnace, and belongs to the technical field of blast furnaces. Comprising an inlet head, the outlet end of the inlet head is fixedly connected with an anti-return pipe, the surface of the anti-return pipe is fixedly connected with a discharge pipe, a sliding ball is arranged in the anti-return pipe in a sliding mode, one end of the anti-return pipe is fixedly connected with an end cover, and one end of the discharge pipe is provided with an oxygenation adjusting assembly. A connecting assembly is fixedly installed at one end of the oxygen adding adjusting assembly and one end of the inlet head. The device has the advantages that blowing gas enters the inlet head through the connecting assembly, gas pressure ejects the sliding ball in the anti-return pipe to enable the sliding ball to slide upwards, the blowing gas enters the exhaust pipe and then enters the oxygenation adjusting assembly, oxygen is added through the oxygenation adjusting assembly to adjust the oxygen content, and then the blowing gas and the oxygen adding adjusting assembly are sprayed into the blast furnace together; and when the injection gas stops being introduced, the sliding ball falls into the bottom of the anti-return pipe through self gravity, and the anti-return pipe is closed again, so that high-temperature gas in the blast furnace is prevented from escaping through the anti-return pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of blast furnaces, and in particular relates to a blast furnace backfire prevention device. Background Art

[0002] Under normal coal injection conditions in a blast furnace, the injection pressure in front of the coal gun is 50kpa greater than the pressure in the furnace behind the coal gun, ensuring that the pulverized coal is transported to the furnace. However, when the injection system fails, equipment fails, pipelines are blocked, the pressure of the injection gas (nitrogen or compressed air) suddenly fluctuates greatly, and the blast furnace is viciously damaged, slag is filled in the tuyere, etc., the pressure at the front end of the coal gun will be lower than the pressure in the furnace, causing the high-temperature hot air (about 1200℃) in the furnace to flow back out of the blast furnace. In order to avoid damage to the normal temperature and pressure injection pipelines and auxiliary devices outside the furnace and the expansion of accidents in this case, a safety check valve needs to be installed in front of the coal gun to protect the injection equipment outside the furnace.

[0003] Conventional coal injection check valve structures include swing valves and ball valves. The swing valve's anti-backflow check body is located in the center of the fluid. When conveying solid matter, it has large resistance, fast wear and short life. If the valve mouth is not discovered in time after wear, it often fails to prevent backfire due to poor sealing when backflow occurs in the furnace. The ball valve has an irregular sealing surface and poor sealing effect. The check bodies of both valve bodies are in a suspended unstable state when conveying coal powder. For this reason, we propose an anti-backfire device that is convenient for powder gas mixed conveying. Utility Model Content

[0004] The technical problem to be solved by the utility model is to prevent the high-temperature hot air in the furnace from flowing back out of the blast furnace when conveying coal powder. Aiming at the deficiencies of the prior art, a blast furnace backfire prevention device is provided.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] It includes an entry head, the outlet end of the entry head is fixedly connected to an anti-backflow tube, the surface of the anti-backflow tube is fixedly connected to a discharge tube, a sliding ball is slidably provided inside the anti-backflow tube, the sliding ball is used to close the outlet end of the entry head, one end of the anti-backflow tube is fixedly connected to an end cap, one end of the discharge tube is provided with an oxygenation regulating component, and a connecting component is fixedly installed between the oxygenation regulating component and one end of the entry head.

[0007] Furthermore, the anti-backflow pipe is in the shape of an arc-shaped pipe, and the diameter of the discharge pipe is smaller than the diameter of the anti-backflow pipe.

[0008] Furthermore, the oxygen addition regulating component includes a three-way pipe installed at the outlet of the discharge pipe, a regulating valve is fixedly installed at the inlet at the bottom of the three-way pipe, an oxygen pipe is installed at the bottom of the regulating valve, and the outlet end of the three-way pipe is fixedly installed with the connecting component.

[0009] Furthermore, a threaded head is fixedly installed on the top of the end cover, the top of the threaded head is threadedly connected to an oxygen inlet cleaning valve, and a shunt pipe is fixedly connected to the middle of the oxygen pipe, and the shunt pipe is fixedly installed with the oxygen inlet cleaning valve.

[0010] Furthermore, the connection assembly includes two groups of connection pipes threadedly connected to the entry head and one end of the three-way pipe, and one end of the connection pipe is provided with a quick connector.

[0011] Furthermore, the connecting assembly includes two groups of adjusting cylinders respectively arranged at one end of the entry head and the oxygenation adjusting assembly, one end of the adjusting cylinder is fixedly connected to a sealing frame, the sealing frame and the inner part of the adjusting cylinder are slidably provided with a connecting cylinder, one end of the connecting cylinder is fixedly connected to a sealing head, a sealing gasket is provided on one side of the sealing head, one side of the sealing head abuts against the inner wall of the adjusting cylinder, and the surface of the connecting cylinder is fixedly connected to a rotating head.

[0012] Furthermore, a boss frame is provided on one side of one group of the connection components, and a curved surface matching with a sliding ball is provided on one side of the boss frame, and the sliding ball abuts against the side where the curved surface of the boss frame is located.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. The injection gas enters the inlet head through the connecting assembly. The gas pressure pushes open the sliding ball inside the anti-backflow pipe, causing the sliding ball to slide upward and no longer block the entrance of the anti-backflow pipe. The injection gas enters the discharge pipe and then enters the oxygen adding and regulating assembly. After the oxygen content is adjusted by adding oxygen through the oxygen adding and regulating assembly, it is sprayed into the blast furnace together. When the injection gas is stopped, the sliding ball falls to the bottom of the anti-backflow pipe by its own gravity, and the anti-backflow pipe is re-closed to prevent the high-temperature gas in the blast furnace from escaping through the anti-backflow pipe.

[0015] 2. Increase the oxygen content of the injected gas by adjusting the oxygen addition adjustment component, and on the premise of safe production, increase oxygen enrichment to promote full combustion and increase production capacity.

[0016] 3. The device is connected to the device for injecting pulverized coal mixed gas and the blast furnace through quick connectors. The weight of the oxygen pipe and the regulating valve ensures that the air inlet of the anti-backflow pipe is always at the bottom to avoid the anti-backflow pipe from rotating due to the quick connector. As a result, the ball can be blocked after falling, making the anti-backfire function of the device more stable.

[0017] 4. Since the injected gas is a mixture of coal powder and gas, when the coal powder enters the anti-backflow pipe, it is easy to adhere to the inner wall of the anti-backflow pipe and affect the falling of the sliding ball. At this time, open the oxygen inlet cleaning valve and close the regulating valve. Oxygen enters the anti-backflow pipe through the diversion pipe, and the coal powder is brushed from the top of the anti-backflow pipe to keep the anti-backflow pipe clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0019] Figure 1 : A three-dimensional structural diagram of Example 1 of the utility model;

[0020] Figure 2 : A schematic diagram of the cross-section structure of Embodiment 1 of the present invention;

[0021] Figure 3 : A schematic diagram of the cross-section structure of Embodiment 2 of the present invention;

[0022] Figure 4 : A three-dimensional structural diagram of Example 3 of the present utility model;

[0023] Figure 5 : A schematic diagram of the structure after being decomposed after being cut away in Example 3 of the present utility model.

[0024] Among them, 10, inlet head; 11, anti-backflow pipe; 12, discharge pipe; 13, sliding ball; 14, end cover; 15, boss frame; 20, adjusting cylinder; 21, sealing frame; 22, connecting cylinder; 23, sealing head; 24, sealing gasket; 25, rotating head; 30, oxygen addition adjustment component; 31, three-way pipe; 32, regulating valve; 33, oxygen pipe; 34, threaded head; 35, oxygen inlet cleaning valve; 36, diverter pipe; 40, connecting pipe; 41, quick connector. DETAILED DESCRIPTION

[0025] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0026] Example 1: See Figure 1-2The present embodiment is a blast furnace backfire prevention device, which includes an inlet head 10, an outlet end of the inlet head 10 is fixedly connected to an anti-backfire pipe 11, a surface of the anti-backfire pipe 11 is fixedly connected to a discharge pipe 12, one end of the discharge pipe 12 is provided with an oxygen addition adjustment component 30, the oxygen addition adjustment component 30 and one end of the inlet head 10 are fixedly installed with a connecting component, the injection gas enters the inlet head 10 through the connecting component, and the anti-backfire pipe 11 is internally provided with a sliding ball 13, and the sliding ball 13 is used to close the inlet head 1 0, the gas pressure pushes open the sliding ball 13 inside the anti-backflow tube 11, causing the sliding ball 13 to slide upward and no longer block the entrance of the anti-backflow tube 11. One end of the anti-backflow tube 11 is fixedly connected with an end cover 14. The injection gas enters the discharge pipe 12 and then enters the oxygen addition adjustment component 30. After the oxygen is added by the oxygen addition adjustment component 30 to adjust the oxygen content, it is sprayed into the blast furnace together. When the injection gas is stopped, the sliding ball 13 falls to the bottom of the anti-backflow tube 11 by its own gravity, and the anti-backflow tube 11 is re-closed.

[0027] See also Figure 1-2 The anti-backflow tube 11 is in the shape of an arc tube, the diameter of the discharge tube 12 is smaller than the diameter of the anti-backflow tube 11, and the sliding ball of the arc-shaped anti-backflow tube 11 moves more smoothly.

[0028] See also Figure 1-2 The oxygen addition regulating assembly 30 includes a three-way pipe 31 installed at the outlet of the discharge pipe 12. A regulating valve 32 is fixedly installed at the inlet at the bottom of the three-way pipe 31. The handle of the regulating valve 32 is turned to adjust the amount of oxygen entering to avoid excessive oxygen entering. An oxygen pipe 33 is installed at the bottom of the regulating valve 32. Pressurized oxygen enters the regulating valve 32 through the oxygen pipe 33, and then enters the three-way pipe 31 through the regulating valve 32. The outlet end of the three-way pipe 31 is fixedly installed with the connecting assembly, and then discharged into the blast furnace through the connecting assembly.

[0029] See also Figure 1-5 A boss frame 15 is provided on one side of the connection component to which the entry head 10 is connected. A curved surface matching the sliding ball 13 is provided on one side of the boss frame 15. The sliding ball 13 abuts against the side where the curved surface of the boss frame 15 is located. The boss frame 15 with the curved surface fits more closely with the sliding ball 13, thereby increasing the sealing effect of the sliding ball 13.

[0030] Beneficial effects:

[0031] 1. The injection gas enters the inlet head 10 through the connecting assembly. The gas pressure pushes open the sliding ball 13 inside the anti-backflow tube 11, causing the sliding ball 13 to slide upward and no longer block the entrance of the anti-backflow tube 11. The injection gas enters the discharge pipe 12 and then enters the oxygen addition adjustment assembly 30. After the oxygen is added by the oxygen addition adjustment assembly 30 to adjust the oxygen content, the gas is sprayed into the blast furnace together. When the injection gas is stopped, the sliding ball 13 falls to the bottom of the anti-backflow tube 11 by its own gravity, and the anti-backflow tube 11 is re-closed to prevent the high-temperature gas in the blast furnace from escaping through the anti-backflow tube 11.

[0032] 2. The oxygen content of the injected gas is increased by adjusting the oxygen addition adjustment component 30, and under the premise of safe production, oxygen enrichment is increased to promote full combustion and increase production capacity.

[0033] Embodiment 2: Embodiment 2 is a further improvement made on the basis of Embodiment 1, see Figure 1-3 In a blast furnace backfire prevention device of this embodiment, the connecting components include connecting pipes 40. Two groups of connecting pipes 40 are threadedly connected to one end of the entry head 10 and the three-way pipe 31 respectively. A quick connector 41 is provided at one end of the connecting pipe 40. The quick connector is combined with an external quick connector seat. This part is the prior art and will not be repeated. One side of a group of connecting pipes 40 close to the entry head 10 is fixedly connected to the boss frame 15.

[0034] Beneficial effect: The device is connected to the device for injecting pulverized coal mixed gas and the blast furnace respectively through the quick connector 41. The weight of the oxygen pipe 33 and the regulating valve 32 ensures that the air inlet part of the anti-backflow pipe 11 is always at the bottom, thereby preventing the anti-backflow pipe 11 from rotating due to the quick connector 41 and the anti-backflow pipe 11 from being inverted and unable to prevent backfire. As a result, the ball can be blocked at the entry head after falling, making the anti-backfire function of the device more stable.

[0035] Embodiment 3: Embodiment 3 is a further improvement made on the basis of Embodiment 1, see Figure 3 In the present embodiment, a blast furnace backfire prevention device is provided, a threaded head 34 is fixedly installed on the top of the end cover 14, an oxygen inlet cleaning valve 35 is threadedly connected to the top of the threaded head 34, the oxygen inlet cleaning valve 35 is opened and the regulating valve 32 is closed, a shunt pipe 36 is fixedly connected to the middle of the oxygen pipe 33, the shunt pipe 36 and the oxygen inlet cleaning valve 35 are fixedly installed, oxygen enters the anti-backfire pipe 11 through the shunt pipe 36 and the oxygen inlet cleaning valve 35, and flushes the coal powder adhered to the anti-backfire pipe 11.

[0036] Beneficial effect: Since the injected gas is a mixture of coal powder and gas, when the coal powder enters the anti-backflow pipe 11, it is easy to adhere to the inner wall of the anti-backflow pipe 11 and affect the falling of the sliding ball 13. At this time, the oxygen inlet cleaning valve 35 is opened and the regulating valve 32 is closed. Oxygen enters the anti-backflow pipe 11 through the diversion pipe 36, flushes the coal powder from the top of the anti-backflow pipe 11, and keeps the anti-backflow pipe 11 clean.

[0037] Embodiment 4: Embodiment 4 is a further improvement made on the basis of Embodiment 1, see Figure 4-5 In the embodiment of the present invention, a blast furnace backfire prevention device, the connection components all include an adjustment cylinder 20, two groups of adjustment cylinders 20 are respectively arranged at one end of the entry head 10 and the oxygen addition adjustment component 30, one side of the adjustment cylinder 20 close to the entry head 10 is fixedly connected with a threaded pipe, the boss frame 15 is fixedly installed at one end of the threaded pipe, a group of adjustment cylinders 20 close to the oxygen addition adjustment component 30 is fixedly connected to the oxygen addition adjustment component 30, one end of the adjustment cylinder 20 is fixedly connected with a sealing frame 21, the sealing frame 21 and the inner sliding of the adjustment cylinder 20 are provided with a connecting cylinder 22, one end of the connecting cylinder 22 is fixedly connected with a sealing head 23, the sealing head 2 A sealing gasket 24 is provided on one side of 3, one side of the sealing head 23 abuts against the inner wall of the regulating cylinder 20, and a rotating head 25 is fixedly connected to the surface of the connecting cylinder 22. When the rotating head 25 is rotated, the rotating head drives the connecting cylinder 22 to rotate, so that the connecting cylinder 22 is rotated into the inner thread cylinder in the external device. At this time, the sealing frame 21 abuts against the end of the external inner thread cylinder, and the position of the rotating regulating device is rotated to make the oxygen addition regulating component 30 vertically downward. The connecting cylinder 22 drives the sealing head 23 to move, so that the sealing head 23 and the inner wall of the regulating cylinder 20 are squeezed to complete the sealing, and the sealing effect between the sealing head 23 and the regulating cylinder 20 is increased by the sealing gasket 24.

[0038] Beneficial Effects

[0039] 1. By separating the connecting tube 22 from the entry head 10, and the connecting tube 22 from the oxygenation adjustment assembly 30, the device can be rotated and adjusted before installation, so as to avoid the oxygenation adjustment assembly 30 turning upward and causing the anti-backflow pipe 11 to be inverted and unable to prevent backfire. In addition, the retractable connecting tube 22 facilitates the separate disassembly and assembly of the device, which is more convenient to use.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blast furnace backfire prevention device, characterized in that: The invention comprises an entry head (10), wherein an outlet end of the entry head (10) is fixedly connected to an anti-backflow pipe (11), a surface of the anti-backflow pipe (11) is fixedly connected to an outlet pipe (12), a sliding ball (13) is slidably arranged inside the anti-backflow pipe (11), and the sliding ball (13) is used to close the outlet end of the entry head (10), one end of the anti-backflow pipe (11) is fixedly connected to an end cap (14), one end of the outlet pipe (12) is provided with an oxygenation regulating component (30), and a connection component is fixedly installed on the oxygenation regulating component (30) and one end of the entry head (10).

2. The blast furnace backfire prevention device according to claim 1, characterized in that: The anti-backflow pipe (11) is in the shape of an arc-shaped pipe, and the diameter of the discharge pipe (12) is smaller than the diameter of the anti-backflow pipe (11).

3. The blast furnace backfire prevention device according to claim 1, characterized in that: The oxygen addition regulating assembly (30) comprises a three-way pipe (31) installed at the outlet of the discharge pipe (12); a regulating valve (32) is fixedly installed at the inlet at the bottom of the three-way pipe (31); an oxygen pipe (33) is installed at the bottom of the regulating valve (32); and the outlet end of the three-way pipe (31) is fixedly installed with the connecting assembly.

4. The blast furnace backfire prevention device according to claim 3, characterized in that: A threaded head (34) is fixedly mounted on the top of the end cover (14), an oxygen inlet cleaning valve (35) is threadedly connected to the top of the threaded head (34), a shunt pipe (36) is fixedly connected to the middle of the oxygen pipe (33), and the shunt pipe (36) is fixedly mounted on the oxygen inlet cleaning valve (35).

5. The blast furnace backfire prevention device according to claim 3, characterized in that: The connection components each comprise a connection pipe (40), two groups of connection pipes (40) being threadedly connected to one end of the entry head (10) and the three-way pipe (31), respectively, and a quick connector (41) is provided at one end of the connection pipe (40).

6. The blast furnace backfire prevention device according to claim 3 or 4, characterized in that: The connection components each comprise an adjustment cylinder (20), two groups of adjustment cylinders (20) being respectively arranged at one end of the entry head (10) and the oxygenation adjustment component (30), one end of the adjustment cylinder (20) being fixedly connected to a sealing frame (21), a connection cylinder (22) being slidably arranged inside the sealing frame (21) and the adjustment cylinder (20), one end of the connection cylinder (22) being fixedly connected to a sealing head (23), one side of the sealing head (23) being provided with a sealing gasket (24), one side of the sealing head (23) being in contact with the inner wall of the adjustment cylinder (20), and a rotating head (25) being fixedly connected to the surface of the connection cylinder (22).

7. The blast furnace backfire prevention device according to claim 1, characterized in that: A boss frame (15) is provided on one side of the connection assembly to which the entry head (10) is connected, and an arc surface matching the sliding ball (13) is provided on one side of the boss frame (15), and the sliding ball (13) abuts against the side of the boss frame (15) where the arc surface is located.

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