Novel anti-backfire device

Abstract

The utility model relates to the technical field of metallurgical tuyere coal injection equipment, in particular to a novel anti-backfire device which comprises a bent pipe, a first connecting pipe is fixedly connected to the bottom end of the bent pipe, a pipe cap is installed at the top end of the bent pipe, a second connecting pipe communicated with the interior of the bent pipe is fixedly connected to the side wall, away from the first connecting pipe, of the bent pipe, and the second connecting pipe and the first connecting pipe are coaxially arranged. A plugging ball is movably arranged in the bent pipe, and a spring used for elastically extruding the plugging ball is installed in the pipe cap. The anti-backfire device has the characteristic of effectively improving the anti-backfire effect.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical tuyere coal injection equipment, in particular to a novel anti-backfire device. Background Art

[0002] In the existing metal smelting technology, spraying pulverized coal into the furnace through a coal injection gun is still the main way and medium of conveying fuel for blast furnace ironmaking. The coal injection gun is generally made of heat-resistant seamless steel pipe.

[0003] At present, the coal injection gun system consists of a coal injection gun tube, a manual ball valve, etc. In recent years, with the increase in blast furnace smelting intensity, the coal powder injection flow rate has increased. If there is a pressure difference between the inside and outside of a normally operating blast furnace, the hot air from the blast furnace may flow back, causing damage to the coal injection gun or coal powder reflux combustion.

[0004] To solve the above problems, related technologies such as the Chinese utility model patent with authorization announcement number CN220555700U discloses a coal injection gun backfire prevention device, including a feed pipe, a quick connector is arranged on the feed pipe, the quick connector includes a first quick connector and a second quick connector, the first quick connector is arranged at the left end of the feed pipe, the second quick connector is arranged at the right end of the feed pipe through a connecting seat, a bent pipe is arranged on the connecting seat, a steel ball is arranged in the bent pipe, and a mounting seat is arranged at the top of the bent pipe.

[0005] Under normal circumstances, the steel ball is blown to the top of the elbow by the coal powder, and the coal powder is normally transported to the blast furnace. When the coal powder is stopped, the steel ball falls down and blocks the channel in the connection seat to solve the problem of flashback. However, in actual use, the speed of the steel ball falling due to its own weight or the speed of falling due to the obstruction of the attachment on the inner wall of the elbow may not be as fast as the flashback speed, resulting in the steel ball not blocking the channel in time and the problem of incomplete anti-flashback effect. Utility Model Content

[0006] In order to solve the problem that the anti-flashback effect in the background technology is not thorough, the utility model provides a novel anti-flashback device.

[0007] The novel anti-flashback device provided by the utility model adopts the following technical solutions:

[0008] A novel anti-backfire device comprises a bent pipe, a pipe 1 is fixedly connected to the bottom end of the bent pipe, a pipe cap is installed at the top end of the bent pipe, a pipe 2 which is connected to the inside of the bent pipe is fixedly connected to the side wall of the bent pipe away from the pipe 1, the pipe 2 is coaxially arranged with the pipe, a sealing ball is movably arranged in the bent pipe, and a spring for elastically squeezing the sealing ball is installed in the pipe cap.

[0009] By adopting the above technical solution, when coal powder is normally conveyed, the coal powder drives the sealing ball to move to the top of the bent pipe and the spring is elastically compressed; when the conveying is stopped, the sealing ball is accelerated to fall under the dual effects of the spring elastic potential energy and the sealing ball's own weight to seal the pipeline, thereby effectively improving the overall anti-backfire effect of the device.

[0010] Optionally, the spring is in a curved shape adapted to the curved pipe.

[0011] By adopting the above technical solution, the spring and the bent pipe are adapted to facilitate concentrated force application to the blocking ball.

[0012] Optionally, a conical sealing surface is provided at the junction between the bent pipe and the first connecting pipe.

[0013] By adopting the above technical solution, the conical sealing surface can more effectively contact with the sealing ball to cooperate with the sealing.

[0014] Optionally, a guide pipe is fixedly connected to the inner wall of the second connecting pipe near the bent pipe, a gap for coal powder to flow is provided between the guide pipe and the second connecting pipe, an annular groove is provided on the inner wall of the second connecting pipe facing the guide pipe, a filter box connected to the annular groove is fixedly connected to the bottom of the second connecting pipe, and a collection box is installed at the bottom of the filter box.

[0015] By adopting the above technical solution, under the guidance of the guide pipe, the coal powder around the pipeline enters the annular groove, the filter box and the collecting box, and the coal powder in the middle of the pipeline is blocked by the blocking ball, thereby improving the overall anti-backfire effect.

[0016] Optionally, the guide pipe includes a reduced diameter portion which gradually reduces in diameter from the curved pipe to the connecting pipe and an extended portion which is in the shape of a straight pipe.

[0017] By adopting the above technical solution, a two-stage guiding effect is formed, which not only guides the coal flow during normal coal injection, but also guides the coal flow during tempering.

[0018] In summary, the present invention includes at least one of the following beneficial technical effects:

[0019] During normal coal transportation, the coal powder drives the plugging ball to move to the top of the elbow, and the spring is elastically compressed; when transportation stops, the plugging ball is accelerated to fall down under the dual effects of the spring elastic potential energy and the deadweight of the plugging ball to plug the pipeline, thereby effectively improving the overall anti-flashback effect of the device;

[0020] The spring and the elbow are adapted to facilitate concentrated force application on the blocking ball;

[0021] Under the guidance of the guide pipe, the coal powder around the pipeline enters the annular groove, filter box and collecting box, and the coal powder in the middle of the pipeline is blocked by the blocking ball, which improves the overall anti-backfire effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a cross-sectional view of a novel anti-flashback device according to an embodiment of the utility model.

[0023] Figure 2 yes Figure 1 Section view along line AA.

[0024] Explanation of the reference numerals: 1. bent pipe; 10. pipe cap; 11. sealing surface; 2. pipe connection 1; 3. pipe connection 2; 30. annular groove; 4. sealing ball; 5. spring; 6. guide pipe; 60. reduced diameter portion; 61. extension portion; 7. filter box; 8. collection box. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 -Attached Figure 2 The utility model is described in further detail.

[0026] The utility model embodiment discloses a novel anti-flashback device, which is installed on a coal injection gun. Figure 1 The novel anti-backfire device includes a 90° elbow 1, a pipe 2 is fixedly connected to the bottom end of the elbow 1, a pipe 2 is fixedly connected to the side wall of the elbow 1 away from the pipe 2, and the pipe 2 3 is connected to the inside of the elbow 1. The pipe 2 3 is coaxially arranged with the pipe 2, and the pipe 2, the elbow 1 and the pipe 2 3 form a channel for coal powder to flow. During the normal coal delivery process, the coal powder is transported from the pipe 2 to the pipe 2 3.

[0027] Reference Figure 1 A pipe cap 10 is detachably mounted on the top of the elbow 1, and a blocking ball 4 is movably arranged in the elbow 1. The blocking ball 4 can be a ceramic ball or a steel ball, and the diameter of the blocking ball 4 is smaller than the inner diameter of the elbow 1. A conical blocking surface 11 is provided at the joint between the elbow 1 and the connecting pipe 2, and the passage is closed when the blocking ball 4 abuts against the blocking surface 11.

[0028] Reference Figure 1 A spring 5 is fixed inside the pipe cap 10. The spring 5 is curved and fits the elbow 1. When the coal powder is normally transported, the coal powder drives the blocking ball 4 to rise to the top of the elbow 1. At this time, the spring 5 is elastically compressed and accumulates elastic potential energy. When the transportation stops, the blocking ball 4 is accelerated by its own gravity potential energy and the elastic potential energy of the spring 5, thereby accelerating the blocking speed and improving the anti-flashback effect.

[0029] Reference Figure 1 , Figure 1 The middle dotted line indicates the flow direction of coal powder during the tempering process. In order to further reduce the coal powder entrained by the tempering and entering the connecting pipe 2, a guide pipe 6 is provided on the inner wall of the connecting pipe 3 near the elbow 1. The guide pipe 6 includes a reduced diameter portion 60 which gradually reduces in diameter from the elbow 1 to the connecting pipe 23 and a straight tube-shaped extension portion 61. The reduced diameter portion 60 is fixedly connected to the inner wall of the connecting pipe 23, and a gap for coal powder to flow is provided between the extension portion 61 and the connecting pipe 23.

[0030] Reference Figure 1 and Figure 2 An annular groove 30 is provided on the inner wall of the connecting pipe 2 3 facing the guide pipe 6, and a filter box 7 for receiving and filtering coal powder is fixedly connected to the bottom wall of the connecting pipe 2 3, and a collecting box 8 is installed at the bottom of the filter box 7. The coal powder in the tempering process around the channel can enter the annular groove 30, the filter box 7 and the collecting box 8 under the guidance of the guide pipe 6, and the coal powder in the tempering process in the middle of the channel can be blocked by the blocking ball 4.

[0031] The implementation principle of the new anti-flashback device of the embodiment of the utility model is as follows: during normal coal injection, the coal powder drives the sealing ball 4 to enter the top of the curved pipe 1, and the spring 5 is elastically compressed; when the coal injection is stopped, the sealing ball 4 is accelerated to fall and abut against the sealing surface 11 under the dual effects of the elastic drive of the spring 5 and the deadweight of the sealing ball 4; if flashback occurs, a part of the coal powder entrained by the flashback is blocked by the sealing ball 4, and the other part enters the collecting box 8 under the guidance of the guide pipe 6, thereby effectively improving the anti-flashback effect of the device.

[0032] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A novel anti-flashback device, comprising a curved pipe (1), a pipe connection (2) being fixedly connected to the bottom end of the curved pipe (1), a pipe cap (10) being installed at the top end of the curved pipe (1), a pipe connection (3) being fixedly connected to the side wall of the curved pipe (1) away from the pipe connection (2) and communicating with the interior of the curved pipe (1), the pipe connection (3) being coaxially arranged with the pipe connection (2), a blocking ball (4) being movably arranged in the curved pipe (1), characterized in that: A spring (5) for elastically squeezing the sealing ball (4) is installed in the pipe cap (10).

2. The novel anti-flashback device according to claim 1 is characterized in that: The spring (5) is in a curved shape adapted to the curved pipe (1).

3. The novel anti-flashback device according to claim 1 is characterized in that: A conical sealing surface (11) is provided at the connection point between the bent pipe (1) and the connecting pipe 1 (2).

4. The novel anti-flashback device according to claim 1 is characterized in that: A guide pipe (6) is fixedly connected to the inner wall of the second pipe (3) near the bent pipe (1), a gap for coal powder to flow is provided between the guide pipe (6) and the second pipe (3), an annular groove (30) is provided on the inner wall of the second pipe (3) facing the guide pipe (6), a filter box (7) in communication with the annular groove (30) is fixedly connected to the bottom of the second pipe (3), and a collecting box (8) is installed at the bottom of the filter box (7).

5. The novel anti-flashback device according to claim 4 is characterized in that: The guide pipe (6) comprises a reduced diameter portion (60) which gradually reduces in diameter from the curved pipe (1) toward the second pipe (3) and an extended portion (61) which is in the shape of a straight pipe.

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