Coal and gas separating and filtering device of dust collecting pipe of Faster rotor scale

Abstract

The utility model discloses a coal and gas separating and filtering device for a dust collecting pipe of a Fister rotor weight.The coal and gas separating and filtering device comprises a separating box, the separating box is hollow, the bottom of the separating box is provided with a gas inlet, pulverized coal and air can enter the separating box from the gas inlet, and a first baffle set, a second baffle set and a third baffle set are sequentially arranged in the separating box in the first direction; the negative-pressure air suction assembly is arranged at the top of the separation box and can produce negative-pressure suction force, so that pulverized coal and air move upwards in the separation box and sequentially pass through the first baffle set, the second baffle set and the third baffle set in a continuous S-shaped track. The filter assembly is arranged close to the top of the separation box, and after pulverized coal and air sequentially pass through the first baffle set, the second baffle set and the third baffle set in a continuous S-shaped track, the filter assembly can stop the pulverized coal from continuously moving and enable the air to continuously move through the filter element, so that the effect of separating the pulverized coal from the air is achieved; and blockage caused by accumulation of the pulverized coal in the dust collection pipe above the separation box is avoided, so that the influence on blanking of the rotor scale is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cement production, and in particular to a coal and gas separation and filtering device with a Pfister rotor called a dust collecting pipe. Background Art

[0002] In cement clinker production lines, Pfister rotor scales are used for coal powder metering and transportation, and gas positive pressure is used for material discharge in the discharge pipe. Due to wear between the rotor and the sealing plate of the rotor scale or changes in the gap between the rotor and the sealing plate, gas upstream causes gas resistance, which can easily cause poor coal powder discharge in the coal powder bin. The upward flow of gas will drive the coal powder upward. When the coal powder enters the rotor scale, it will also enter the dust collecting pipe driven by the gas, resulting in too much coal powder in the dust collecting pipe, which will block the dust collecting pipe, thereby affecting the discharge of the rotor scale and causing great instability in production.

[0003] Therefore, we propose a coal and gas separation and filtering device with a Pfister rotor called a dust collecting tube. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a coal and gas separation and filtering device with a Fister rotor called a dust collecting pipe.

[0005] In a first aspect, the present application provides a coal and gas separation and filtering device with a Pfister rotor dust collecting pipe, comprising:

[0006] A separation box, wherein the length direction of the separation box extends along a first direction, the interior of the separation box is hollow, and an air inlet is arranged at the bottom. A first baffle group, a second baffle group, and a third baffle group are sequentially arranged inside the separation box along the first direction, and are used to make the air and coal powder entering from the air inlet move inside the separation box along a continuous S-shaped trajectory, and block the coal powder;

[0007] A negative pressure suction component, which is arranged on the top of the separation box and is connected to the inside of the separation box, and is used to generate negative pressure suction to suck out the air entering the separation box from the air inlet;

[0008] A filter assembly is arranged inside the separation box and close to the top of the separation box, and is used to prevent the coal powder from being sucked out by the negative pressure suction assembly.

[0009] According to the technical solution provided in the embodiment of the present application, the first baffle group includes two first mirror baffles, the second baffle group includes two second mirror baffles, and the third baffle group includes two third mirror baffles. The first mirror baffle, the second mirror baffle and the third mirror baffle are all arranged to be fixedly connected to the inner wall of the separation box through supporting ribs, and the angles between the axes of the first mirror baffle, the second mirror baffle and the third mirror baffle and the first direction are all less than 20°.

[0010] According to the technical solution provided in the embodiment of the present application, a first notch is provided through the second mirror baffle, and a second notch is provided through the third mirror baffle, so that the air and coal powder entering the separation box from the air inlet pass through the first mirror baffle, the first notch and the second notch in sequence along a continuous S-shaped trajectory, and the first mirror baffle, the second mirror baffle and the third mirror baffle can block the coal powder.

[0011] According to the technical solution provided in the embodiment of the present application, the negative pressure suction component includes an exhaust pipe, a first flange is provided at the bottom of the exhaust pipe, and the pipe is connected to the top of the separation box through the first flange and is connected to the interior of the separation box, a dust collecting pipe is connected to the top of the exhaust pipe, a first valve is provided between the exhaust pipe and the dust collecting pipe, which is used to control the opening and closing of the flow path between the exhaust pipe and the dust collecting pipe, a suction part is provided on the dust collecting pipe, which is used to provide negative pressure suction, and a negative pressure gauge is provided on the exhaust pipe, which is used to display the air pressure value inside the exhaust pipe.

[0012] According to the technical solution provided in the embodiment of the present application, the filter assembly includes a filter element, which is hollow inside, the top of the filter element is connected to the end of the first flange away from the exhaust pipe, and the filter element passes through the top of the separation box and extends to the inside of the separation box, so as to block the coal powder from entering the exhaust pipe.

[0013] According to the technical solution provided in the embodiment of the present application, it also includes a cleaning component, which includes a compressed gas pipe, one end of which passes through the side wall of the exhaust pipe and extends to the inside of the filter element and is connected to a rotating nozzle, and the other end of which is located outside the exhaust pipe and is connected to a compressed air tank. A solenoid valve is provided on the part of the compressed gas pipe located outside the exhaust pipe, which is electrically connected to an external controller and is used to periodically open and close the flow path of the compressed gas pipe.

[0014] According to the technical solution provided in the embodiment of the present application, a branch pipe is provided on the dust collecting pipe, the branch pipe is connected to the outside, and a second valve is provided on the branch pipe.

[0015] According to the technical solution provided in the embodiment of the present application, the circumferential side walls and the top of the separation box are both provided with a thermal insulation layer.

[0016] In summary, the technical solution specifically discloses a coal and gas separation and filtering device with a Fister rotor called a dust collecting pipe, including a separation box, the length direction of which extends along a first direction, the interior of the separation box is hollow, and an air inlet connected to the interior of the separation box is opened at the bottom, and coal powder and air can enter the interior of the separation box from the air inlet, and a first baffle group, a second baffle group and a third baffle group are sequentially arranged inside the separation box along the first direction; a negative pressure suction component is arranged on the top of the separation box, which can generate negative pressure suction on the coal powder and air entering the separation box from the air inlet, so that the coal powder and The air moves upward in the separation box, passing through the first baffle group, the second baffle group and the third baffle group in sequence in a continuous S-shaped trajectory; a filter assembly is also provided inside the separation box, which is arranged close to the top of the separation box. After the coal powder and air pass through the first baffle group, the second baffle group and the third baffle group in sequence in a continuous S-shaped trajectory, the filter assembly can stop the coal powder from continuing to move, and allow the air to continue to move through the filter element, thereby achieving the effect of separating the coal powder and the air, avoiding the accumulation of coal powder in the dust collecting pipe above the separation box and causing blockage, thereby avoiding affecting the discharge of the rotor scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0018] Figure 1 This is a schematic diagram of a coal and gas separation and filtering device with a Pfister rotor and dust collecting tube.

[0019] Figure 2 Schematic diagram of the separation box.

[0020] Figure 3 Schematic diagram of the exhaust pipe.

[0021] Figure 4 Schematic diagram of the internal structure of the separation box.

[0022] Numbers in the figure: 1, separation box; 2, first baffle group; 3, second baffle group; 4, third baffle group; 5, first mirror baffle; 6, second mirror baffle; 7, third mirror baffle; 8, support rib; 9, first notch; 10, second notch; 11, exhaust pipe; 12, first flange; 13, dust collecting pipe; 14, first valve; 15, negative pressure gauge; 16, filter element; 17, compressed gas pipe; 18, rotating nozzle; 19, compressed air tank; 20, solenoid valve; 21, branch pipe; 22, second valve; 23, insulation layer; 24, stirring steady flow bin; 25, first inner wall; 26, fourth inner wall; DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Embodiment 1

[0026] Please refer to Figures 1 to 4 As shown, a coal and gas separation and filtering device of a dust collecting pipe of a Fister rotor scale comprises a separation box 1, which is a rectangular parallelepiped extending in a first direction, and is hollow inside the separation box 1, and an air inlet communicating with the inside thereof is arranged at the bottom, and a stirring type steady flow bin 24 is connected to the bottom of the air inlet, and the stirring type steady flow bin 24 is used to discharge coal powder, and the coal powder is transported into the rotor scale by a positive pressure discharge method, and due to wear between the rotor and the sealing plate of the rotor scale or a change in the gap between the rotor and the sealing plate, the gas flows upward and drives the coal powder to enter the separation box 1 from the air inlet;

[0027] like Figure 1 As shown, the first baffle group 2, the second baffle group 3 and the third baffle group 4 are sequentially arranged inside the separation box 1 along the first direction, which are used to block the coal powder and separate the air from the coal powder; wherein the first baffle group 2 is close to the bottom of the separation box 1; the first direction is Figure 1 Middle vertical direction;

[0028] Specifically, Figure 1 and Figure 4 As shown, the separation box 1 has a first inner wall 25 and a second inner wall arranged in parallel along the second direction, and also has a third inner wall and a fourth inner wall 26 arranged in parallel along the third direction. The first inner wall 25 and the second inner wall are provided with rib groups corresponding to the first baffle group 2, the second baffle group 3 and the third baffle group 4. The rib group includes two supporting ribs 8, and the two supporting ribs 8 are fixedly connected to the first inner wall 25 and the second inner wall respectively, and the two supporting ribs 8 are staggered. The second direction is Figure 1 The middle horizontal direction, the third direction is Figure 4 The middle arrow indicates a direction, the first direction is perpendicular to the second direction and perpendicular to the third direction, and the second direction is perpendicular to the third direction;

[0029] Optionally, the support rib 8 is a triangular structure having adjacent first and second hypotenuses, wherein the first hypotenuses of the two support ribs 8 are fixedly connected to the first inner wall 25 and the second inner wall respectively, and at this time, the first hypotenuse is parallel to the first direction, and the angle between the first hypotenuse and the second hypotenuse is less than 20°.

[0030] like Figure 4 As shown, the first baffle group 2 includes two first mirror baffles 5, the second baffle group 3 includes two second mirror baffles 6, and the third baffle group 4 includes two third mirror baffles 7. The two first mirror baffles 5 are respectively fixedly connected to the second oblique edges of the two corresponding support ribs 8, the two second mirror baffles 6 are respectively fixedly connected to the second oblique edges of the two corresponding support ribs 8, and the two third mirror baffles 7 are respectively fixedly connected to the second oblique edges of the two corresponding support ribs 8, and the angles between the axes of the first mirror baffles 5, the second mirror baffles 6 and the third mirror baffles 7 and the first direction are all less than 20°;

[0031] The side walls of the two first mirror baffles 5 that are far away from each other in the second direction are fixedly connected to the first inner wall 25 and the second inner wall respectively, the side walls of the two second mirror baffles 6 that are far away from each other in the second direction are fixedly connected to the first inner wall 25 and the second inner wall respectively, and the side walls of the two third mirror baffles 7 that are far away from each other in the second direction are fixedly connected to the first inner wall 25 and the second inner wall respectively;

[0032] The side walls of the two first mirror baffles 5 that are separated from each other in the third direction are fixedly connected to the third inner wall and the fourth inner wall 26 respectively, the side walls of the two second mirror baffles 6 that are separated from each other in the third direction are fixedly connected to the third inner wall and the fourth inner wall 26 respectively, and the side walls of the two third mirror baffles 7 that are separated from each other in the third direction are fixedly connected to the third inner wall and the fourth inner wall 26 respectively;

[0033] A first notch 9 is provided through the second mirror baffle 6, and the first notch 9 is located in the middle and upper part of the second mirror baffle 6; a second notch 10 is provided through the third mirror baffle 7, and the second notch 10 is located in the upper part of the third mirror baffle 7;

[0034] Therefore, by setting the first notch 9 and the second notch 10, and the two first mirror baffles 5, the two second mirror baffles 6 and the two third mirror baffles 7 are staggered through the supporting ribs 8, the coal powder and air entering the separation box 1 from the air inlet first move upward through the bottom of the two first mirror baffles 5, then continue to move upward through the bottom of the second mirror baffle 6 and the first notch 9, and finally pass through the bottom of the third mirror baffle 7 and the second notch 10. The movement trajectory is a continuous S-shape, and the coal powder is blocked by the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 in turn on the movement trajectory, and Since the angles between the axes of the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 and the first direction are all less than 20°, the contact area between the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 and the coal powder is effectively increased, and a large amount of coal powder is effectively blocked from ascending with the air, thereby achieving the effect of coal gas separation, and the blocked coal powder can fall back to the bottom of the separation box 1 under the action of gravity. Since the friction coefficients of the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 are very small, the coal powder can slide down along the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 under the action of gravity.

[0035] The negative pressure suction component is arranged on the top of the separation box 1 and is connected to the inside of the separation box 1, and is used to generate negative pressure suction to suck out the air entering the separation box 1 from the air inlet;

[0036] Specifically, Figures 1 to 3 As shown, a through hole communicating with the interior of the separation box 1 is provided at the top, and the negative pressure suction assembly includes an exhaust pipe 11, a first flange 12 is provided at the bottom of the exhaust pipe 11, and the first flange 12 is connected to the top of the separation box 1 by bolts, so that the exhaust pipe 11 is connected to the through hole, and a dust collecting pipe 13 is provided at the top of the exhaust pipe 11, and the top of the dust collecting pipe 13 is connected to the box body (not shown in the figure), and a negative pressure suction piece is provided in the box body, and the negative pressure suction force generated by the negative pressure suction piece makes the exhaust pipe 11 have negative pressure suction force, so that the air inside the separation box 1 can be sucked and transported into the box body;

[0037] Furthermore, a negative pressure gauge 15 is provided on the exhaust pipe 11, which can display the air pressure value inside the exhaust pipe 11;

[0038] A first valve 14 is provided between the exhaust pipe 11 and the dust collecting pipe 13;

[0039] Specifically, a second flange is arranged at the top of the exhaust pipe 11, a third flange is arranged at the bottom of the dust collecting pipe 13, and the top and bottom of the first valve 14 are respectively connected to the third flange and the second flange, thereby, by opening the first valve 14, the air flow passage between the exhaust pipe 11 and the dust collecting pipe 13 can be opened, so that the exhaust pipe 11 has negative pressure suction, and closing the first valve 14 can stop the negative pressure suction; wherein, the type of the first valve 14 is, for example: a butterfly valve;

[0040] Furthermore, the dust collecting pipe 13 is flange-connected with an expansion joint;

[0041] Furthermore, a branch pipe 21 is provided on the dust collecting pipe 13, and one end of the branch pipe 21 away from the dust collecting pipe 13 is connected to the outside, and a second valve 22 is provided at the end of the branch pipe 21 away from the dust collecting pipe 13. By opening the second valve 22, the passage between the dust collecting pipe 13 and the external air can be opened. When the negative pressure value in the exhaust pipe 11 is too large, air pressure compensation is performed by opening the second valve 22; wherein the type of the second valve 22 is, for example: a butterfly valve.

[0042] The filter assembly includes a filter element 16, the filter element 16 is hollow inside, and the top of the filter element 16 and the bottom of the first flange 12 are located inside the separation box 1 and above the third baffle group 4, which can isolate the coal powder and the air, separate the coal powder and the air, and prevent the coal powder from entering the exhaust pipe 11;

[0043] The filter element 16 is made of metal powder as raw material, and is formed by cold pressing and then sintered by high temperature vacuum. It has a certain precision and can block coal powder on the surface of the filter element 16, while air can pass through the filter element.

[0044] A cleaning component, which is used to clean the coal powder attached to the surface of the filter element 16, thereby blowing off the coal powder to avoid clogging the filter element 16;

[0045] Specifically, the cleaning component includes a compressed gas pipe 17, one end of the compressed gas pipe 17 passes through the side wall of the exhaust pipe 11 and extends to the inside of the filter element 16, and is connected to a rotating nozzle 18, the other end of the compressed gas pipe 17 is located outside the exhaust pipe 11, and is connected to a compressed air tank 19, and the part of the compressed gas pipe 17 located outside the exhaust pipe 11 is provided with a solenoid valve 20, the solenoid valve 20 is electrically connected to an external controller, and the external controller can periodically open the solenoid valve 20 at a fixed time, so that the compressed air in the compressed air tank 19 is ejected from the rotating nozzle 18, thereby cleaning the coal powder attached to the surface of the filter element 16 and causing the coal powder to fall to the bottom of the separation box 1.

[0046] The circumferential side walls and the top of the separation box 1 are provided with a heat-insulating layer 23 to keep the temperature inside the separation box 1 stable and avoid coal powder agglomeration caused by a large temperature difference between the inside and outside of the separation box 1.

[0047] Working principle: When discharging coal powder, positive pressure discharging is adopted, and the positive pressure air transports the coal powder to the stirring steady flow bin 24, and then the coal powder is transported to the rotor scale through the stirring steady flow bin 24. Due to the wear between the rotor and the sealing plate of the rotor scale or the change in the gap between the rotor and the sealing plate, the sealing is damaged, so that the gas flows upward and drives the coal powder and air into the separation box 1 from the air inlet. At this time, by starting the negative pressure suction piece in the box and opening the first valve 14, the suction force generated by the negative pressure suction piece acts on the exhaust pipe 11, so that negative pressure is generated inside the exhaust pipe 11, so as to achieve the effect of generating suction for the coal powder and air in the separation box 1. By adjusting the opening of the second valve 22, the negative pressure in the exhaust pipe 11 is adjusted, and the negative pressure is controlled between -50pa-0pa through the negative pressure value display of the negative pressure gauge 15;

[0048] The coal powder and air are driven into the separation box 1 by the gas upflow, and the coal powder and air are attracted upward by the negative pressure suction. The coal powder and air move along a continuous S-shaped trajectory inside the separation box 1, passing through the first baffle group 2, the second baffle group 3 and the third baffle group 4 in turn. In this process, most of the coal powder is first blocked by the first mirror baffle 5, and falls back to the bottom of the separation box 1 under the action of gravity. The remaining coal powder continues to move upward with the air through the bottom of the first mirror baffle 5, and then part of the coal powder is blocked by the second mirror baffle 6. The remaining coal powder continues to move upward with the air through the bottom of the second mirror baffle 6 and the first notch 9, and is then blocked by the third mirror baffle 7. At this time, a small part of the coal powder still passes through the bottom of the third mirror baffle 7 and the second notch 10. Under the negative pressure suction, the coal powder is blocked on the surface of the filter element 16, and the air enters the exhaust pipe 11 through the filter element 16, and enters the box body through the dust collecting pipe 13, and is discharged;

[0049] After long-term operation, coal powder will continue to adhere to the surface of the filter element 16, and the external controller can periodically open the solenoid valve 20 to allow the compressed air in the compressed air tank 19 to be ejected from the rotating nozzle 18, thereby cleaning the coal powder attached to the surface of the filter element 16 and causing the coal powder to fall; the angles between the axes of the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 and the first direction are all less than 20°, so that the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 have a sufficient inclination angle to enable the coal powder to slide quickly;

[0050] The blown-off coal powder falls onto the third mirror baffle 7, and is then dropped onto the second mirror baffle 6 by gravity. The coal powder blocked by the second mirror baffle 6 falls onto the first mirror baffle 5 by gravity. Since the friction coefficients of the first mirror baffle 5, the second mirror baffle 6 and the third mirror baffle 7 are very small, the coal powder will slide and fall back to the bottom of the separation box 1, thereby achieving the separation effect of coal powder and air, and avoiding the coal powder clogging the dust collecting pipe 13 and affecting the discharge of the rotor scale.

[0051] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A coal and gas separation and filtering device with a Pfister rotor and dust collecting pipe, characterized in that: include: A separation box (1), wherein the length direction of the separation box (1) extends along a first direction, the interior of the separation box (1) is hollow, and an air inlet is arranged at the bottom; a first baffle group (2), a second baffle group (3) and a third baffle group (4) are arranged in sequence along the first direction inside the separation box (1), and are used to make the air and coal powder entering from the air inlet move along a continuous S-shaped trajectory inside the separation box (1) and block the coal powder; A negative pressure suction component, the negative pressure suction component is arranged on the top of the separation box (1) and is connected to the interior of the separation box (1), and is used to generate negative pressure suction to suck out the air entering the interior of the separation box (1) from the air inlet; A filter assembly is arranged inside the separation box (1) and close to the top of the separation box (1), and is used to prevent the coal powder from being sucked out by the negative pressure suction assembly.

2. The coal and gas separation and filtering device of the Pfister rotor dust collecting pipe according to claim 1 is characterized in that: The first baffle group (2) comprises two first mirror baffles (5), the second baffle group (3) comprises two second mirror baffles (6), and the third baffle group (4) comprises two third mirror baffles (7); the first mirror baffle (5), the second mirror baffle (6) and the third mirror baffle (7) are all fixedly connected to the inner wall of the separation box (1) via supporting ribs (8), and the angles between the axes of the first mirror baffle (5), the second mirror baffle (6) and the third mirror baffle (7) and the first direction are all less than 20°.

3. The coal and gas separation and filtering device of the Pfister rotor dust collecting pipe according to claim 2 is characterized in that: The second mirror baffle (6) is provided with a first notch (9) through it, and the third mirror baffle (7) is provided with a second notch (10) through it, so that the air and coal powder entering the separation box (1) from the air inlet pass through the first mirror baffle (5), the first notch (9) and the second notch (10) in sequence along a continuous S-shaped trajectory, and the first mirror baffle (5), the second mirror baffle (6) and the third mirror baffle (7) are capable of blocking the coal powder.

4. The coal and gas separation and filtering device of the Pfister rotor dust collecting pipe according to claim 1 is characterized in that: The negative pressure suction component comprises an exhaust pipe (11); a first flange (12) is provided at the bottom of the exhaust pipe (11), and the exhaust pipe (11) is connected to the top of the separation box (1) through the first flange (12), and is communicated with the interior of the separation box (1); a dust collecting pipe (13) is connected to the top of the exhaust pipe (11); a first valve (14) is provided between the exhaust pipe (11) and the dust collecting pipe (13), and is used to control the opening and closing of the flow path between the exhaust pipe (11) and the dust collecting pipe (13); an air suction member is provided on the dust collecting pipe (13), and is used to provide negative pressure suction; and a negative pressure gauge (15) is provided on the exhaust pipe (11), and is used to display the air pressure value inside the exhaust pipe (11).

5. The coal and gas separation and filtering device of the Fister rotor dust collecting pipe according to claim 4 is characterized in that: The filter assembly comprises a filter element (16) which is hollow inside, the top of the filter element (16) being connected to an end of the first flange (12) away from the exhaust pipe (11), and the filter element (16) passing through the top of the separation box (1) and extending into the interior of the separation box (1) to prevent the coal powder from entering the exhaust pipe (11).

6. A coal and gas separation and filtering device for a Pfister rotor dust collecting pipe according to claim 5, characterized in that: The cleaning assembly also includes a cleaning component, the cleaning component including a compressed gas pipe (17), one end of the compressed gas pipe (17) passing through the side wall of the exhaust pipe (11) and extending to the interior of the filter element (16) and connected to a rotating nozzle (18), and the other end of the compressed gas pipe (17) is located outside the exhaust pipe (11) and connected to a compressed air tank (19), and a solenoid valve (20) is provided on the portion of the compressed gas pipe (17) located outside the exhaust pipe (11), which is electrically connected to an external controller and is used to periodically open and close the flow path of the compressed gas pipe (17).

7. The coal and gas separation and filtering device of the Fister rotor dust collecting pipe according to claim 4 is characterized in that: The dust collecting pipe (13) is provided with a branch pipe (21), the branch pipe (21) is connected to the outside, and a second valve (22) is provided on the branch pipe (21).

8. The coal and gas separation and filtering device of the Fister rotor dust collecting pipe according to claim 1 is characterized in that: The circumferential side walls and the top of the separation box (1) are both provided with a thermal insulation layer (23).

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