Novel coal injection anti-backfire device

Abstract

A novel coal injection anti-backfire device is arranged between a coal injection gun and a blast furnace and provided with an elbow, when coal is fed, high-pressure coal powder enables a ball in the elbow to overcome the gravity of the ball to be lifted and move along the inner wall of the elbow, the high-pressure coal powder smoothly enters the blast furnace, and when the situations such as equipment faults occur, the coal injection gun end loses pressure, the ball falls back under the gravity, and the coal injection gun end is not damaged. Hot flames in the blast furnace are blocked by the balls to avoid tempering; the clamping part is arranged, so that the quick connector of the device can be disassembled by using tools such as a wrench, and even if the device is slightly deformed, the quick connector can be disassembled through the clamping part; by arranging the quick connector, the device can be quickly assembled and disassembled between the coal injection gun and the blast furnace; by arranging a clamping part and a quick connector, the device can be more conveniently disassembled, assembled, maintained, overhauled and replaced; one end of the device is arranged to be the quick male connector, and the other end of the device is arranged to be the quick female connector, so that the device has obvious directionality structurally, and direction errors during installation are avoided.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace smelting industry, in particular to a novel coal injection backfire prevention device. Background Art

[0002] In the blast furnace smelting industry using coal as fuel, a coal injection gun is usually used to spray high-pressure coal powder into the blast furnace smelting equipment. The coal powder burns in the blast furnace to generate heat for metal smelting. There is also a certain pressure in the blast furnace, but its pressure value is less than the pressure generated by the coal injection gun spraying high-pressure coal powder. The coal injection gun is at the high-pressure end relative to the blast furnace, and the coal powder can enter the blast furnace smoothly. When equipment failure, temporary power outage, fault repair, etc. occur, the pressure at the coal injection gun end may drop rapidly or even disappear. At this time, when the blast furnace is at the high-pressure end relative to the coal injection gun, the hot flame in the blast furnace flows back to the coal injection gun end, and a "flashback" phenomenon occurs, which may cause combustion or even explosion, posing a greater safety hazard. Adding an anti-flashback device between the coal injection gun and the blast furnace can solve the above problem.

[0003] The existing anti-backfire device adopts a valve plate structure, which has a one-way opening and closing characteristic. When high-pressure coal powder passes through the valve plate structure, it can open the valve plate and enter the blast furnace. When the pressure at the coal injection gun end weakens or even disappears, the pressure generated by the hot flame in the blast furnace is blocked by the valve plate and cannot open the valve plate. Since the valve plate and its connecting structure are relatively fragile, the repeated impact of the hot flame in the blast furnace may cause damage to the valve plate and its connecting structure, making the valve plate structure function ineffective.

[0004] The working conditions of blast furnace smelting equipment are complex. To ensure safety, regular maintenance and overhaul are required. When equipment fails, temporary repairs are required to resume production as soon as possible. This requires the anti-backfire device to be easy to disassemble and assemble.

[0005] The anti-flashback device is installed between the coal injection gun and the blast furnace and has directionality. If the anti-flashback device itself has no obvious directionality in structure, the installer is not familiar with the installation direction, or is careless during installation, the installation direction may be inverted, and the anti-flashback device cannot play a role and is not easy to detect in time. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the utility model provides a new coal injection anti-flashback device, which solves the problem that the strength of the existing coal injection anti-flashback device is difficult to meet the working conditions of blast furnace smelting; the coal injection anti-flashback device is easy to disassemble to adapt to the situation where regular maintenance is required during blast furnace smelting; and the problem that the coal injection anti-flashback device may be installed in the wrong direction is solved.

[0008] (II) Technical solution

[0009] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A novel coal injection backfire prevention device is provided with a coal inlet pipe and a coal outlet pipe, the coal inlet pipe is connected to the coal outlet pipe, an elbow is further connected between the coal inlet pipe and the coal outlet pipe, the lower port of the two ports of the elbow is connected to the coal inlet pipe, the elbow is provided with a hole corresponding to the coal outlet pipe, the coal inlet pipe, the elbow and the coal outlet pipe are all welded and connected; a sphere is provided in the elbow, the inner diameters of the coal inlet pipe and the coal outlet pipe are both smaller than the diameter of the sphere, and the inner diameter of the elbow is not smaller than the diameter of the sphere; the coal inlet pipe is provided with a first annular recess adapted to the sphere, and the first annular recess The recess is smoothly connected to the inner wall of the elbow; the port of the elbow away from the coal inlet pipe is connected with an end cover; a clamping portion is arranged on the outer periphery of the coal inlet pipe, and the outer contour of the clamping portion is a regular N-gon, and N is an even number greater than 3; the end of the coal inlet pipe away from the elbow is connected with a quick-connect joint, and the outer periphery of the end of the quick-connect joint close to the coal inlet pipe is provided with a clamping portion; the end of the coal outlet pipe away from the elbow is also connected with a quick-connect joint, and the outer periphery of the end of the quick-connect joint close to the coal outlet pipe is provided with a clamping portion; of the two quick-connect joints, one is arranged as a quick-connect male joint, and the other is arranged as a quick-connect female joint.

[0011] Preferably, the end of the coal inlet pipe away from the elbow is provided with an external thread, and the quick-connect joint connected to the coal inlet pipe is provided with an internal thread adapted thereto; the end of the coal outlet pipe away from the elbow is provided with an external thread, and the quick-connect joint connected to the coal outlet pipe is provided with an internal thread adapted thereto.

[0012] Preferably, a second annular recess is provided on the outer periphery near the outer end of the quick-connect male joint, a through hole is provided on the side wall near the outer end of the quick-connect female joint, an optical axis is provided between the side walls of the through hole, and the axial direction of the optical axis is perpendicular to the axial direction of the quick-connect female joint, an eccentric rod is sleeved on the outer periphery of the optical axis, two through holes are relatively provided on the side wall of the quick-connect female joint, and two eccentric rods are correspondingly provided, and the two eccentric rods are relatively provided, and the eccentric rods are provided with an eccentric sleeve, a pull rod, and a pull ring, the eccentric sleeve is sleeved on the outer periphery of the optical axis, the eccentric sleeve is connected to the pull rod, and the end of the pull rod away from the eccentric sleeve is connected to the pull ring; an O-ring is circumferentially embedded in the middle part of the inner wall of the quick-connect female joint; when the quick-connect male joint and the quick-connect female joint have adaptation requirements, the outer periphery of the two eccentric sleeves of the quick-connect female joint is adapted to the second annular recess of the quick-connect male joint, and the outer end of the quick-connect male joint corresponds to the O-ring.

[0013] Preferably, the coal inlet pipe, the coal outlet pipe and the inner wall of the elbow are all provided with wear-resistant and impact-resistant linings, and the inner diameter of the wear-resistant and impact-resistant lining of the elbow is not less than the diameter of the sphere.

[0014] Preferably, the wear-resistant and impact-resistant lining material is set to one of alumina ceramics, silicon carbide ceramics, silicon nitride ceramics, and zirconium oxide ceramics.

[0015] Preferably, the spherical material is set to be one of alumina ceramics, silicon carbide ceramics, silicon nitride ceramics, zirconium oxide ceramics, and carbon bearing steel.

[0016] (III) Beneficial effects

[0017] The utility model provides a new type of coal injection backfire prevention device, which has the following beneficial effects:

[0018] By setting an elbow between the coal inlet pipe and the coal outlet pipe, when coal is fed in, the high-pressure coal powder causes the sphere in the elbow to overcome its own gravity and lift up and move along the inner wall of the elbow, so that the coal inlet pipe and the coal outlet pipe remain unobstructed, and the high-pressure coal powder enters the blast furnace smoothly. When equipment failure, temporary power outage, fault repair, etc. occur, the coal inlet pipe end loses pressure, the sphere falls back under gravity, and the hot flame in the blast furnace enters the coal outlet pipe, so that the sphere is in close contact with the first annular depression of the coal inlet pipe, preventing it from entering the coal injection gun end to avoid flashback.

[0019] By setting the clamping part, the quick-connect joint of the new coal injection anti-flashback device can be disassembled using tools such as a wrench. Even if the new coal injection anti-flashback device is slightly deformed, it can be disassembled through the clamping part; by setting the quick-connect joint, the new coal injection anti-flashback device can be quickly installed and removed between the coal injection gun and the blast furnace. By setting the clamping part and the quick-connect joint, the device can be disassembled, maintained, repaired and replaced more conveniently.

[0020] By arranging two ends of the novel coal injection anti-flashback device, one end is provided with a quick-connect male joint and the other end is provided with a quick-connect female joint, the novel coal injection anti-flashback device has obvious directionality in structure, thus avoiding direction errors during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0022] Figure 2 It is a schematic cross-sectional view of the structure of the utility model;

[0023] Figure 3 This is a right side view schematic diagram of the coal inlet pipe of the utility model;

[0024] Figure 4 This is a cross-sectional view of the utility model quick-connect female connector;

[0025] Figure 5 This is a cross-sectional view of the quick-connect male connector of the utility model;

[0026] Figure 6This is a schematic diagram of the connection state of the quick-connect male connector and the quick-connect female connector of the utility model (the eccentric rod is not buckled);

[0027] Figure 7 This is a schematic diagram of the connection state of the quick-connect male connector and the quick-connect female connector of the utility model (the eccentric rod is buckled);

[0028] Figure 8 This is a schematic diagram of the lifting state of the ball under the action of high-pressure coal powder in the utility model;

[0029] Fig. 9 It is a schematic diagram of the sphere falling back under the action of the hot flame of the blast furnace.

[0030] 1-coal inlet pipe, 11-first annular depression, 2-coal outlet pipe, 3-elbow, 4-sphere, 5-end cover, 6-clamping part, 7-quick-connector, 71-quick-connector male connector, 711-second annular depression, 72-quick-connector female connector, 721-through hole, 722-optical axis, 723-eccentric rod, 7231-eccentric sleeve, 7232-pull rod, 7233-pull ring, 8-O-ring, 9-wear-resistant and impact-resistant lining. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "inside" and "outside" etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0034] Please refer to the figure Figure 1-Figure 3 , Figure 8-Figure 9The utility model embodiment provides a technical solution: a novel coal injection backfire prevention device, which is provided with a coal inlet pipe 1 and a coal outlet pipe 2, wherein the coal inlet pipe 1 is connected to the coal outlet pipe 2, and an elbow 3 is further connected between the coal inlet pipe 1 and the coal outlet pipe 2, wherein the lower port of the two ports of the elbow 3 is connected to the coal inlet pipe 1, and the elbow 3 is provided with a hole corresponding to the coal outlet pipe 2, and the coal inlet pipe 1, the elbow 3 and the coal outlet pipe 2 are all welded and connected; a sphere 4 is provided in the elbow 3, the inner diameters of the coal inlet pipe 1 and the coal outlet pipe 2 are both smaller than the diameter of the sphere 4, and the inner diameter of the elbow 3 is not smaller than the diameter of the sphere 4; the coal inlet pipe 1 is provided with a first annular recess 11 adapted to the sphere 4 , the first annular recess 11 is smoothly connected to the inner wall of the elbow 3; the port of the elbow 3 away from the coal inlet pipe 1 is connected with an end cover 5; the outer periphery of the coal inlet pipe 1 is provided with a clamping portion 6, the outer contour of the clamping portion 6 is a regular N-gon, and N is an even number greater than 3, the end of the coal inlet pipe 1 away from the elbow 3 is connected with a quick connector 7, and the outer periphery of the end of the quick connector 7 close to the coal inlet pipe 1 is provided with a clamping portion 6, the end of the coal outlet pipe 2 away from the elbow 3 is also connected with a quick connector 7, and the outer periphery of the end of the quick connector 7 close to the coal outlet pipe 2 is provided with a clamping portion 6; of the two quick connectors 7, one is set as a quick male connector 71, and the other is set as a quick female connector 72. It should be particularly noted that: the port of the elbow 3 is the opening at the end of the elbow 3; the first annular recess 11 (such as Figure 3 As shown) is conducive to the close contact between the inner wall of the coal inlet pipe 1 and the ball 4 to form a good seal; the first annular recess 11 is smoothly connected to the inner wall of the elbow 3 (as shown Figure 2 The significance of the fastener 7 is that when the ball 4 moves toward the coal inlet pipe 1, the ball 4 is prevented from colliding with the coal inlet pipe 1, which may damage the ball 4 itself and affect the sphericity. The clamping portion 6 can be clamped with a wrench to complete the assembly and disassembly of the quick-connect joint 7. Usually, the clamping portion 6 (as shown in FIG. 1 ) of the coal inlet pipe 1 is clamped. Figure 3The clamping part 6 of the quick-connect joint 7 is used as a fixed clamping part, and the clamping part 6 of the quick-connect joint 7 is used as a movable clamping part, that is, the clamping part 6 of the coal inlet pipe 1 is fixed by a tool such as a wrench, and the clamping part 6 of the quick-connect joint 7 is rotated by other tools such as a wrench to complete the loading and unloading of the quick-connect joint 7; the two quick-connect joints 7, one is set as a quick-connect male joint 71, and the other is set as a quick-connect female joint 72. The significance is that the new coal injection anti-flashback device has obvious directionality in structure, which can avoid the problem of wrong installation direction when it is installed between the coal injection gun and the blast furnace. That is to say, before installation, the coal injection gun and the blast furnace are pre-installed with quick-connect joints that are compatible with the new coal injection anti-flashback device. Connecting joints. Since the 7 types of quick-connect connectors on both sides of the new coal-injection anti-flashback device are different, the structure has obvious directionality and will not cause the wrong installation direction. If the direction is wrong, the docking installation cannot be completed. The above-mentioned settings are helpful for the user to form internal specifications, that is, to determine the type of quick-connect connector set at the output end of the coal-injection gun. If quick-connect female connectors are uniformly used, quick-connect male connectors are uniformly set at the input end of the blast furnace. The ends of the device connected to the coal-injection gun and the blast furnace are respectively set to quick-connect male connectors and quick-connect female connectors. When the user has multiple sets of blast furnace equipment, it is particularly important to establish unified specifications, which can help enterprises achieve efficient loading and unloading and safe and standardized management.

[0035] See also Figure 2 , Figure 4-Figure 5 In this embodiment, the end of the coal inlet pipe 1 away from the elbow 3 is provided with an external thread, and the quick connector 7 connected to the coal inlet pipe 1 is provided with an internal thread adapted thereto; the end of the coal outlet pipe 2 away from the elbow 3 is provided with an external thread, and the quick connector 7 connected to the coal outlet pipe 2 is provided with an internal thread adapted thereto.

[0036] See also Figure 4-Figure 7In this embodiment, a second annular recess 711 is provided on the outer periphery near the outer end of the quick-connect male connector 71, a through hole 721 is provided on the side wall near the outer end of the quick-connect female connector 72, an optical axis 722 is provided between the side walls of the through hole 721, and the axial direction of the optical axis 722 is perpendicular to the axial direction of the quick-connect female connector 72, an eccentric rod 723 is sleeved on the outer periphery of the optical axis 722, two through holes 721 are relatively provided on the side wall of the quick-connect female connector 72, two eccentric rods 723 are correspondingly provided, the two eccentric rods 723 are relatively provided, and the eccentric rod 723 is provided with an eccentric sleeve 7231, pull rod 7232, pull ring 7233, the eccentric sleeve 7231 is sleeved on the outer periphery of the optical axis 722, the eccentric sleeve 7231 is connected to the pull rod 7232, and the end of the pull rod 7232 away from the eccentric sleeve 7231 is connected to the pull ring 7233; an O-ring 8 is circumferentially embedded in the middle of the inner wall of the quick connect female joint 72; when the quick connect male joint 71 and the quick connect female joint 72 have adaptation requirements, the outer periphery of the two eccentric sleeves 7231 of the quick connect female joint 72 is adapted to the second annular recess 711 of the quick connect male joint 71, and the outer end of the quick connect male joint 71 corresponds to the O-ring 8. It should be particularly noted that: in the present embodiment, the quick-connect male connector and the quick-connect female connector do not need to be directly connected, so the statement "when the quick-connect male connector and the quick-connect female connector have adaptation requirements..." is a selective requirement, that is, the quick-connect male connector and the quick-connect female connector are not necessarily set to be adapted, but the adaptation setting of the quick-connect male connector and the quick-connect female connector has practical significance, which is mainly reflected in adaptability and interchangeability, which can help the user save costs and improve efficiency; quick-connect connectors adapted to both ends of the new coal injection anti-flashback device are pre-installed at the output end of the coal injection gun and the input end of the blast furnace, wherein the quick-connect male connector 71 and the quick-connect female connector 72 are connected, that is, the quick-connect male connector 71 is extended into the quick-connect female connector until it abuts against the O-ring 8, such as Figure 6 As shown, the two eccentric rods 723 are then rotated synchronously so that the eccentric sleeve 7231 of the eccentric rod 723 abuts against the second annular recess 711 of the quick-connect male connector 71, as shown in FIG. Figure 7 As shown, the docking is completed.

[0037] See also Figure 2 In this embodiment, the inner walls of the coal inlet pipe 1 , the coal outlet pipe 2 , and the elbow 3 are all provided with wear-resistant and impact-resistant linings 9 , and the inner diameter of the wear-resistant and impact-resistant lining 9 of the elbow 3 is not less than the diameter of the sphere 4 .

[0038] See also Figure 2 In this embodiment, the wear-resistant and impact-resistant lining 9 is made of one of alumina ceramics, silicon carbide ceramics, silicon nitride ceramics, and zirconium oxide ceramics.

[0039] See also Figure 2In this embodiment, the material of the sphere 4 is set to be one of alumina ceramics, silicon carbide ceramics, silicon nitride ceramics, zirconium oxide ceramics, and carbon bearing steel.

[0040] Working principle and use process of the utility model: when in use, the coal injection anti-flashback device is first installed between the coal injection gun and the blast furnace. Since one end of the two ends of the coal injection anti-flashback device is a quick-connect male connector 71 and the other end is a quick-connect female connector 72, it has directionality and will not cause errors in the installation direction. The coal injection gun injects high-pressure coal powder toward the blast furnace, passes through the new coal injection anti-flashback device, and the coal powder enters the coal inlet pipe 1. The impact and pressure generated by the sphere 4 cause the sphere 4 to overcome its own gravity and lift up, and move in the elbow 3 in the direction away from the coal inlet pipe 1. The coal inlet pipe 1 is connected to the coal outlet pipe 2, and then the coal powder enters the blast furnace; when encountering equipment failure, temporary power outage, fault repair and other situations, the pressure at the coal injection gun end is weakened or even disappears, and the hot flame in the blast furnace moves toward the coal injection gun. Since the pressure generated at the coal injection gun end is not enough to overcome the gravity of the sphere 4, the sphere 4 falls back to the end connected to the coal inlet pipe 1 in the elbow 3, and under the pressure generated by the blast furnace hot flame, it is in close contact with the first annular recess 11 of the coal inlet pipe 1, forming a good seal, blocking the hot flame from entering the coal injection gun end, thereby preventing the occurrence of "flashback". The working conditions of blast furnace smelting equipment are complex. To ensure safety, regular maintenance and overhaul are required. The new type of coal injection anti-flashback device can be conveniently removed from the coal injection gun and the blast furnace through the quick connector 7. The components of the new type of coal injection anti-flashback device can be conveniently disassembled through the clamping portion 6, that is, the quick connector 7 is removed from the new type of coal injection anti-flashback device. The usual operation method is to fix the clamping portion 6 of the coal inlet pipe 1 with a wrench or other tools, and rotate the clamping portion 6 of the quick connector 7 with other wrenches or other tools to complete the disassembly. After disassembly, the internal wear of the new type of coal injection anti-flashback device can be checked, or the quick connector 7 can be used to replace it. It is worth noting that even if the new type of coal injection anti-flashback device is slightly deformed, it can be disassembled through the clamping portion 6.

[0041] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A new type of coal injection anti-flashback device, characterized in that: A coal inlet pipe (1) and a coal outlet pipe (2) are provided, wherein the coal inlet pipe (1) is connected to the coal outlet pipe (2), and an elbow (3) is further connected between the coal inlet pipe (1) and the coal outlet pipe (2), wherein the lower port of the two ports of the elbow (3) is connected to the coal inlet pipe (1), and the elbow (3) is provided with a hole corresponding to the coal outlet pipe (2), and the coal inlet pipe (1), the elbow (3) and the coal outlet pipe (2) are all welded and connected; a sphere (4) is provided in the elbow (3), the inner diameters of the coal inlet pipe (1) and the coal outlet pipe (2) are both smaller than the diameter of the sphere (4), and the inner diameter of the elbow (3) is not smaller than the diameter of the sphere (4); the coal inlet pipe (1) is provided with a first annular recess (11) adapted to the sphere (4), and the first annular recess (11) The end of the coal inlet pipe (1) is connected to the inner wall of the elbow (3); the end of the elbow (3) away from the coal inlet pipe (1) is connected to an end cover (5); the outer periphery of the coal inlet pipe (1) is provided with a clamping portion (6), the outer contour of the clamping portion (6) is a regular N-gon, and N is an even number greater than 3; the end of the coal inlet pipe (1) away from the elbow (3) is connected to a quick-connect joint (7), and the outer periphery of the end of the quick-connect joint (7) close to the coal inlet pipe (1) is provided with a clamping portion (6); the end of the coal outlet pipe (2) away from the elbow (3) is also connected to a quick-connect joint (7), and the outer periphery of the end of the quick-connect joint (7) close to the coal outlet pipe (2) is provided with a clamping portion (6); of the two quick-connect joints (7), one is provided as a quick-connect male joint (71) and the other is provided as a quick-connect female joint (72).

2. The novel coal injection anti-flashback device according to claim 1 is characterized in that: The end of the coal inlet pipe (1) away from the elbow (3) is provided with an external thread, and the quick-connect joint (7) connected to the coal inlet pipe (1) is provided with an internal thread adapted thereto; the end of the coal outlet pipe (2) away from the elbow (3) is provided with an external thread, and the quick-connect joint (7) connected to the coal outlet pipe (2) is provided with an internal thread adapted thereto.

3. The novel coal injection anti-flashback device according to claim 1 is characterized in that: A second annular recess (711) is provided on the periphery near the outer end of the quick-connect male connector (71), a through hole (721) is provided on the side wall near the outer end of the quick-connect female connector (72), an optical axis (722) is provided between the side walls of the through hole (721), and the axial direction of the optical axis (722) is perpendicular to the axial direction of the quick-connect female connector (72), an eccentric rod (723) is sleeved on the periphery of the optical axis (722), two through holes (721) are relatively provided on the side wall of the quick-connect female connector (72), two eccentric rods (723) are correspondingly provided, the two eccentric rods (723) are relatively provided, and the eccentric rod (723) is provided with an eccentric sleeve (7231), a pull rod (7232), a pull ring (7233), the eccentric sleeve (7231) is sleeved on the outer periphery of the optical axis (722), the eccentric sleeve (7231) is connected to the pull rod (7232), and the end of the pull rod (7232) away from the eccentric sleeve (7231) is connected to the pull ring (7233); an O-ring (8) is circumferentially embedded in the middle of the inner wall of the quick-connect female joint (72); when the quick-connect male joint (71) and the quick-connect female joint (72) have adaptation requirements, the outer periphery of the two eccentric sleeves (7231) of the quick-connect female joint (72) is adapted to the second annular recess (711) of the quick-connect male joint (71), and the outer end of the quick-connect male joint (71) corresponds to the O-ring (8).

4. The novel coal injection anti-flashback device according to claim 1 is characterized in that: The inner walls of the coal inlet pipe (1), the coal outlet pipe (2) and the elbow (3) are all provided with wear-resistant and impact-resistant linings (9), and the inner diameter of the wear-resistant and impact-resistant lining (9) of the elbow (3) is not less than the diameter of the sphere (4).

5. The novel coal injection anti-flashback device according to claim 4 is characterized in that: The wear-resistant and impact-resistant lining (9) is made of one of alumina ceramics, silicon carbide ceramics, silicon nitride ceramics and zirconium oxide ceramics.

6. The novel coal injection anti-flashback device according to any one of claims 1 to 5, characterized in that: The material of the sphere (4) is one of alumina ceramics, silicon carbide ceramics, silicon nitride ceramics, zirconium oxide ceramics, and carbon bearing steel.

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