Pneumatic conveying connecting elbow and pneumatic conveying system

Abstract

The utility model relates to a pneumatic conveying connecting elbow and a pneumatic conveying system. The pneumatic conveying connecting elbow comprises an elbow body and two turbulent flow valve sets. The two turbulent flow valve sets are each provided with an air inlet end and an air outlet end, the air inlet ends of the two turbulent flow valve sets are used for being connected with an air source pipeline, the air outlet ends of the two turbulent flow valve sets are connected with the elbow body, and the two ends of the elbow body are used for being connected with material conveying pipes. The air outlet ends of the two turbulent flow valve sets are arranged at intervals in the flowing direction of materials in the elbow body, and the air outlet end of at least one turbulent flow valve set is close to the feeding end of the elbow body. According to the connecting elbow, the air outlet end of the turbulent flow valve group is connected with the elbow body, so that compressed air in the air source pipeline can be independently and directly introduced into the elbow body, materials adhered to the inner wall of the elbow body are washed away, the risk of blocking the elbow body is eliminated, and the elbow body is prevented from being blocked.

Description

Technical Field

[0001] The present disclosure relates to the technical field of pneumatic conveying, and particularly to a connecting elbow for pneumatic conveying and a pneumatic conveying system. Background Art

[0002] Pneumatic conveying technology is a gas-solid two-phase flow technology that uses compressed gas as power for material conveying, and is widely used in the conveying of fly ash, raw materials, etc. in industries such as electric power, chemical industry, and iron and steel.

[0003] In a pneumatic conveying system, the material conveying pipe realizes turning through a connecting elbow. Due to the bending design of the elbow, the material is easily impacted and squeezed at the elbow, resulting in adhesion to the inner wall of the elbow and causing blockage problems. For example, in a pneumatic conveying system and method with the patent number CN202410260812.3 and the name of "A Pneumatic Conveying System and Method", its material conveying pipeline realizes turning through a 90-degree bend, and blockage problems are likely to occur at the turning point. Utility Model Content

[0004] The purpose of the present disclosure is to provide a connecting elbow for pneumatic conveying and a pneumatic conveying system to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above purpose, one aspect of the present disclosure provides a connecting elbow for pneumatic conveying, including an elbow body and two turbulent flow valve groups;

[0006] Both of the two turbulent flow valve groups have an air inlet end and an air outlet end. The air inlet ends of the two turbulent flow valve groups are respectively used to connect with the air source pipeline, the air outlet ends of the two turbulent flow valve groups are respectively connected to the elbow body, the two ends of the elbow body are respectively used to connect with the material conveying pipes, the air outlet ends of the two turbulent flow valve groups are arranged at intervals along the material flow direction in the elbow body, and the air outlet end of at least one of the turbulent flow valve groups is close to the feed end of the elbow body.

[0007] Optionally, the elbow body has an inner curved surface facing the virtual center of the elbow body, and the air outlet ends of the two turbulent flow valve groups are connected to the inner curved surface of the elbow body.

[0008] Optionally, the two turbulent flow valve groups include a first turbulent flow valve group and a second turbulent flow valve group. The first turbulent flow valve group is close to the feed end of the elbow body. The position where the air outlet end of the first turbulent flow valve group is connected to the elbow body is set as a first connection point. The connection line between the end face of the feed end of the elbow body and the virtual center of the elbow body is set as a first line. The connection line between the first connection point and the virtual center of the elbow body is set as a second line. The angle of the first included angle between the first line and the second line is less than or equal to 25°.

[0009] Optionally, the second turbulent flow valve group is close to the discharge end of the elbow body. The position where the air outlet end of the second turbulent flow valve group is connected to the elbow body is set as the second connection point. The line connecting the second connection point and the virtual center of the elbow body is set as the third line. The angle of the second included angle between the second line and the third line is less than or equal to 45°.

[0010] Optionally, the turbulent flow valve group includes a turbulent flow valve, a check valve, a ball valve, and a connecting pipe. The inlet end of the turbulent flow valve is used to connect to the gas source pipeline. The outlet end of the turbulent flow valve is connected to the inlet end of the check valve. The outlet end of the check valve is connected to one end of the ball valve. The other end of the ball valve is connected to one end of the connecting pipe. The other end of the connecting pipe is connected to the elbow body.

[0011] Optionally, the turbulent flow valve group further includes a hose. One end of the hose is connected to the inlet end of the turbulent flow valve, and the other end of the hose is used to connect to the gas source pipeline.

[0012] The second aspect of the present disclosure also provides a pneumatic conveying system, including the connecting elbow for pneumatic conveying described above.

[0013] Optionally, the pneumatic conveying system includes a hopper, a silo pump, a ash bunker, a gas source pipeline, a first material conveying pipe, and a second material conveying pipe. The input end of the silo pump is connected to the outlet of the hopper. The output end of the silo pump and the outlet of the gas source pipeline are both connected to one end of the first material conveying pipe. The outlet of the gas source pipeline is located upstream of the silo pump's output end in the conveying direction of the first material conveying pipe. The other end of the first material conveying pipe is connected to one end of the elbow body of the connecting elbow. One end of the second material conveying pipe is connected to the other end of the elbow body, and the other end of the second material conveying pipe is connected to the ash bunker. The air inlet end of the turbulent flow valve group of the connecting elbow is connected to the gas source pipeline.

[0014] Optionally, the pneumatic conveying system further includes a feed valve and a discharge valve. The two ends of the feed valve are respectively connected to the input end of the silo pump and the outlet of the hopper. The two ends of the discharge valve are respectively connected to the output end of the silo pump and one end of the first material conveying pipe.

[0015] Optionally, the pneumatic conveying system further includes a balance valve and a switch valve. The two ends of the balance valve are respectively connected to the hopper and the silo pump. A connection port is provided on the gas source pipeline. One end of the switch valve is connected to the connection port, and the other end of the switch valve is connected to the air inlet end of the turbulent flow valve group.

[0016] In the above technical solution, by connecting the air inlet end of the turbulent flow valve group to the gas source pipeline and the air outlet end of the turbulent flow valve group to the elbow body, the compressed air in the gas source pipeline can be directly introduced to the elbow body alone, so as to wash the materials adhering to the inner wall of the elbow body, wash away the materials, eliminate the risk of blocking the elbow body, and avoid the blockage of the elbow body. It can be understood that when the large-flow compressed air in the gas source pipeline flows into the elbow body after being regulated by the turbulent flow valve group, a turbulent flow effect can be generated, which can accelerate the flow rate of the materials in the elbow body, so that the relative movement speed of the materials in the elbow body is increased, and the materials adhering to the inner wall of the elbow body can be washed away. In addition, through two turbulent flow valve groups, according to the bending condition of the elbow body, the materials adhering to different positions of the elbow body can be washed respectively, which can effectively avoid the blockage of the elbow body by the materials.

[0017] Other features and advantages of the present disclosure will be described in detail in the following specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a connecting elbow for pneumatic conveying according to an embodiment of the present disclosure;

[0020] Figure 2 is a schematic structural diagram of a pneumatic conveying system according to an embodiment of the present disclosure.

[0021] DESCRIPTION OF THE REFERENCE NUMERALS

[0022] 1. Elbow body, 2. Turbulent flow valve group, 21. First turbulent flow valve group, 22. Second turbulent flow valve group, 23. Turbulent flow valve, 24. Check valve, 25. Ball valve, 26. Connecting pipe, 27. Hose, 28. First included angle, 29. Second included angle, 3. Hopper, 4. Silo pump, 41. Feed valve, 42. Discharge valve, 43. Balance valve, 5. Ash bunker, 6. Gas source pipeline, 61. On-off valve, 7. First material conveying pipe, 8. Second material conveying pipe. SPECIFIC EMBODIMENTS

[0023] The following will describe in detail the specific embodiments of the present disclosure with reference to the drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present disclosure, and are not used to limit the present disclosure.

[0024] In the present disclosure, unless otherwise stated, "inside and outside" refer to the inside and outside of the relevant components. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present disclosure, it should also be noted that unless otherwise clearly specified and limited, the terms "arrangement" 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 directly connected or indirectly connected through an intermediate medium. It can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0026] As Figure 1 shown, one aspect of the present disclosure provides a connecting elbow for pneumatic conveying, including an elbow body 1 and two turbulent flow valve groups 2.

[0027] Both of the two turbulent flow valve groups 2 have an air inlet end and an air outlet end. The air inlet ends of the two turbulent flow valve groups 2 are respectively used to connect with an air source pipeline 6. The air outlet ends of the two turbulent flow valve groups 2 are respectively connected with the elbow body 1. The two ends of the elbow body 1 are respectively used to connect with material conveying pipes. The air outlet ends of the two turbulent flow valve groups 2 are arranged at intervals along the material flow direction inside the elbow body 1. The air outlet end of at least one turbulent flow valve group 2 is close to the feeding end of the elbow body 1.

[0028] Wherein, the two ends of the elbow body 1 can be respectively connected with the material conveying pipes to realize material conveying. It should be noted that this connecting elbow can be arranged at the corresponding position according to actual needs.

[0029] In the above technical solution, by connecting the air inlet end of the turbulent flow valve group 2 with the air source pipeline 6 and connecting the air outlet end of the turbulent flow valve group 2 with the elbow body 1, the compressed air in the air source pipeline 6 can be directly introduced to the elbow body 1 alone, so as to wash the material adhered to the inner wall of the elbow body 1, wash away the material, eliminate the risk of blocking the elbow body 1, and avoid the blockage of the elbow body 1. It can be understood that when the large-flow compressed air in the air source pipeline 6 flows into the elbow body 1 after being regulated by the turbulent flow valve group 2, a turbulent flow effect can be generated, accelerating the flow rate of the material in the elbow body 1, making the relative movement speed of the material in the elbow body 1 faster, and washing away the material adhered to the inner wall of the elbow body 1. In addition, through the two turbulent flow valve groups 2, according to the bending condition of the elbow body 1, the materials adhered to different positions of the elbow body 1 can be respectively washed, effectively avoiding the blockage of the elbow body 1 by materials.

[0030] Optionally, in an embodiment of the present disclosure, the elbow body 1 has an inner curved surface facing the virtual center of the circle of the elbow body 1, and the air outlet ends of the two turbulent flow valve groups 2 are connected with the inner curved surface of the elbow body 1.

[0031] Due to the bending characteristics of the elbow body 1, the material flows under the action of the air flow, and the material will concentrate on contacting the inner wall of the elbow body 1 away from the virtual center of the circle. In this way, the material will concentrate and adhere to the inner wall of the elbow body 1 away from the virtual center of the circle. Therefore, the air outlet ends of the two turbulent flow valve groups 2 are connected to the inner curved surface of the elbow body 1, so that the air flow blown out from the air outlet ends of the turbulent flow valve groups 2 is directed towards the inner wall of the elbow body 1 away from the virtual center of the circle, and the adhered material can be specifically scoured, improving the anti-blocking effect.

[0032] Optionally, in some examples, the air outlet directions of the two turbulent flow valve groups 2 are set at an angle with the tangent of the elbow body 1, and can be perpendicular to each other, which is beneficial to specifically blowing the adhered material.

[0033] Optionally, in an embodiment of the present disclosure, the two turbulent flow valve groups 2 include a first turbulent flow valve group 21 and a second turbulent flow valve group 22. The first turbulent flow valve group 21 is close to the feed end of the elbow body 1. The position where the air outlet end of the first turbulent flow valve group 21 is connected to the elbow body 1 is set as the first connection point. The connection line between the end face of the feed end of the elbow body 1 and the virtual center of the circle of the elbow body 1 is set as the first line. The connection line between the first connection point and the virtual center of the circle of the elbow body 1 is set as the second line. The angle of the first included angle 28 between the first line and the second line is less than or equal to 25°. By setting like this, it can better specifically scour the adhered material and improve the anti-blocking effect.

[0034] Among them, the angle of the first included angle 28 between the first line and the second line is less than or equal to 25°, that is to say, the first turbulent flow valve group 21 is close to the feed end of the elbow body 1 and does not occupy a position that is too far back. It can be understood that due to the bending characteristics of the elbow body 1, in order to maintain the connection with the material connection pipe 26, the feed end of the elbow body 1 is relatively flat and not greatly bent. As the distance from the feed end of the elbow body 1 increases, the bending degree of the elbow body 1 increases, and the probability of the material adhering to the inner wall of the elbow body 1 increases. Therefore, the first turbulent flow valve group 21 can effectively scour the material adhering to the position close to the feed end of the elbow body 1, so that the material is blown away to avoid blockage. If the first turbulent flow valve group 21 is too far back, it is easy to cause blockage at the feed end of the elbow body 1. In some examples, the angle of the first included angle 28 between the first line and the second line can be 15°, 20° or 25°.

[0035] Optionally, in an embodiment of the present disclosure, the second turbulent flow valve group 22 is close to the discharge end of the elbow body 1. The position where the air outlet end of the second turbulent flow valve group 22 is connected to the elbow body 1 is set as the second connection point. The line connecting the second connection point and the virtual center of the elbow body 1 is set as the third line. The angle of the second included angle 29 between the second line and the third line is less than or equal to 45°. By setting it like this, the position near the discharge end in the middle of the elbow body 1 can be effectively purged, so as to blow away the adhered materials and avoid the blockage of the elbow body 1.

[0036] Among them, the angle of the second included angle 29 between the second line and the third line is less than or equal to 45°, that is to say, the second turbulent flow valve group 22 is close to the middle position of the elbow body 1. It can be understood that due to the bending characteristics of the elbow body 1, the bending degree at the middle position of the elbow body 1 is the largest, and the probability of the material adhering to the inner wall of the elbow body 1 is relatively large. Therefore, the second turbulent flow valve group 22 can effectively scour the materials adhering to the middle position near the elbow body 1, so as to blow away the materials and avoid blockage. And for the discharge end of the elbow body 1, due to the connection with the material conveying pipe, its bending degree is small, and the material flows outwards, so it is not easy to adhere to the inner wall of the elbow body 1. In some examples, the angle of the second included angle 29 between the second line and the third line can be 30°, 40° or 45°.

[0037] Optionally, in an embodiment of the present disclosure, the turbulent flow valve group 2 includes a turbulent flow valve 23, a check valve 24, a ball valve 25 and a connecting pipe 26. The inlet end of the turbulent flow valve 23 is used to be connected to the gas source pipeline 6. The outlet end of the turbulent flow valve 23 is connected to the inlet end of the check valve 24. The outlet end of the check valve 24 is connected to one end of the ball valve 25. The other end of the ball valve 25 is connected to one end of the connecting pipe 26. The other end of the connecting pipe 26 is connected to the elbow body 1.

[0038] Among them, the turbulent flow valve 23 can adjust the air flow rate. The check valve 24 can prevent the air or materials flowing in the elbow body 1 from flowing back to the turbulent flow valve 23. And the ball valve 25 can be opened or closed to directly divert the air from the gas source pipeline 6 to the elbow body 1.

[0039] In some examples, the turbulent flow valve 23 can be an intelligent turbulent flow valve 23. The intelligent turbulent flow valve 23 can be integrated with a pressure detection device and a controller. The pressure detection device, the ball valve 25, and the turbulent flow valve 23 are electrically connected to the controller. The pressure detection device can detect the pressure inside the elbow body 1. The intelligent turbulent flow valve 23 can be set with a pressure threshold. If the pressure inside the elbow body 1 is greater than or equal to the pressure threshold, it means that there is a risk of blockage in the elbow body 1. At this time, the controller can control the ball valve 25 to open and adjust the air flow through the turbulent flow valve 23 to achieve the scouring of the adhered material inside the elbow body 1 and eliminate the risk of blockage in the elbow body 1. When the pressure inside the elbow body 1 is less than the pressure threshold, the controller can control the ball valve 25 to close.

[0040] Optionally, in an embodiment of the present disclosure, the turbulent flow valve group 2 further includes a hose 27. One end of the hose 27 is connected to the inlet end of the turbulent flow valve 23, and the other end of the hose 27 is used to be connected to the gas source pipeline 6. By providing the hose 27, it is convenient to connect the inlet end of the turbulent flow valve 23 to the gas source pipeline 6, and it is convenient to connect the elbow to the material conveying pipe.

[0041] As Figure 2 shown, the second aspect of the present disclosure also provides a pneumatic conveying system, including the connecting elbow for pneumatic conveying described above. It should be noted that the connecting elbow for pneumatic conveying can be installed at a suitable position according to actual use needs.

[0042] Optionally, in an embodiment of the present disclosure, the pneumatic conveying system includes a hopper 3, a bin pump 4, a silo 5, a gas source pipeline 6, a first material conveying pipe 7, and a second material conveying pipe 8. The input end of the bin pump 4 is connected to the outlet of the hopper 3. The output end of the bin pump 4 and the outlet of the gas source pipeline 6 are both connected to one end of the first material conveying pipe 7. The outlet of the gas source pipeline 6 is located upstream of the first material conveying pipe 7 compared with the output end of the bin pump 4. The other end of the first material conveying pipe 7 is connected to one end of the elbow body 1 of the connecting elbow. One end of the second material conveying pipe 8 is connected to the other end of the elbow body 1, and the other end of the second material conveying pipe 8 is connected to the silo 5. The air inlet end of the turbulent flow valve group 2 of the connecting elbow is connected to the gas source pipeline 6.

[0043] Among them, the ash hopper 3 is the temporary storage and transfer position of the material. Through the silo pump 4, the material in the ash hopper 3 can be transported to the first material conveying pipe 7, and then conveyed to the ash bunker 5 through the first material conveying pipe 7, the connecting elbow and the second material conveying pipe 8 for collection and storage. The air source pipeline 6 is used to supply compressed air. The compressed air flows from the outlet of the air source pipeline 6 to the first material conveying pipe 7, forming a flowing air current in the first material conveying pipe 7, the connecting elbow and the second material conveying pipe 8. After the silo pump 4 transports the material to the first material conveying pipe 7, the flowing air current can drive the material to move, realizing pneumatic conveying. In some examples, the outlet of the air source pipeline 6 is communicated with the output end of the silo pump 4, and then the output end of the silo pump 4 is communicated with one end of the first material conveying pipe 7.

[0044] Among them, the number of the first material conveying pipe 7, the second material conveying pipe 8 and the connecting elbow can be specifically set according to the actual conveying length, and there is no excessive limitation here. The ash hoppers 3 in the pneumatic conveying system correspond one-to-one with the silo pumps 4, or multiple ones can also be set, respectively for temporarily storing materials at different positions and realizing transfer.

[0045] Optionally, in an embodiment of the present disclosure, the pneumatic conveying system further includes a feed valve 41 and a discharge valve 42. The two ends of the feed valve 41 are respectively connected to the input end of the silo pump 4 and the outlet of the ash hopper 3, and the two ends of the discharge valve 42 are respectively connected to the output end of the silo pump 4 and one end of the first material conveying pipe 7.

[0046] Among them, the feed valve 41 is used to control the conduction and cut-off between the input end of the silo pump 4 and the outlet of the ash hopper 3, so as to control whether the material in the ash hopper 3 enters the silo pump 4. The discharge valve 42 is used to control the conduction and cut-off between the output end of the silo pump 4 and the first material conveying pipe 7, so as to control whether the material is transported from the silo pump 4 to the first material conveying pipe 7.

[0047] Optionally, in an embodiment of the present disclosure, the pneumatic conveying system further includes a balance valve 43 and a switch valve 61. The two ends of the balance valve 43 are respectively connected to the ash hopper 3 and the silo pump 4. A connection port is provided on the air source pipeline 6. One end of the switch valve 61 is connected to the connection port, and the other end of the switch valve 61 is connected to the air inlet end of the turbulence valve group 2.

[0048] Among them, the two ends of the balance valve 43 are used to communicate with the inside of the ash hopper 3 and the inside of the silo pump 4, for balancing the air pressure inside the ash hopper 3 and the inside of the silo pump 4. The switch valve 61 is used to control the conduction or cut-off between the air source pipeline 6 and the air inlet end of the turbulence valve group 2, facilitating the maintenance of the turbulence valve group 2. The number of the switch valves 61 can be the same as and correspond one-to-one with the number of the turbulence valve groups 2.

[0049] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0050] In addition, it should be noted that, in the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0051] Furthermore, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A connecting elbow for pneumatic conveying, characterized in that, It includes an elbow body and two turbulent flow valve groups; Both of the two turbulent flow valve groups have an air inlet end and an air outlet end. The air inlet ends of the two turbulent flow valve groups are respectively used for connecting with an air source pipeline. The air outlet ends of the two turbulent flow valve groups are respectively connected with the elbow body. The two ends of the elbow body are respectively used for connecting with a material conveying pipe. The air outlet ends of the two turbulent flow valve groups are arranged at intervals along the material flow direction inside the elbow body, and the air outlet end of at least one turbulent flow valve group is close to the feed end of the elbow body.

2. The connecting elbow for pneumatic conveying according to claim 1, characterized in that, The elbow body has an inner curved surface facing the virtual center of the elbow body, and the air outlet ends of the two turbulent flow valve groups are connected with the inner curved surface of the elbow body.

3. The connecting elbow for pneumatic conveying according to claim 1, wherein The two turbulent flow valve groups include a first turbulent flow valve group and a second turbulent flow valve group. The first turbulent flow valve group is close to the feed end of the elbow body. The position where the air outlet end of the first turbulent flow valve group is connected with the elbow body is set as a first connection point. The connection line between the end face of the feed end of the elbow body and the virtual center of the elbow body is set as a first line. The connection line between the first connection point and the virtual center of the elbow body is set as a second line. The angle of a first included angle between the first line and the second line is less than or equal to 25°.

4. The connecting elbow for pneumatic conveying according to claim 3, characterized in that, The second turbulent flow valve group is close to the discharge end of the elbow body. The position where the air outlet end of the second turbulent flow valve group is connected with the elbow body is set as a second connection point. The connection line between the second connection point and the virtual center of the elbow body is set as a third line. The angle of a second included angle between the second line and the third line is less than or equal to 45°.

5. The connecting elbow for pneumatic conveying according to any one of claims 1-4, characterized in that The turbulent flow valve group includes a turbulent flow valve, a check valve, a ball valve and a connecting pipe. The inlet end of the turbulent flow valve is used for connecting with the air source pipeline. The outlet end of the turbulent flow valve is connected with the inlet end of the check valve. The outlet end of the check valve is connected with one end of the ball valve. The other end of the ball valve is connected with one end of the connecting pipe. The other end of the connecting pipe is connected with the elbow body.

6. The connecting elbow for pneumatic conveying according to claim 5, characterized in that, The turbulent flow valve group further includes a hose. One end of the hose is connected with the inlet end of the turbulent flow valve, and the other end of the hose is used for connecting with the air source pipeline.

7. A pneumatic conveying system, characterized in that, It includes the connecting elbow for pneumatic conveying according to any one of claims 1-6.

8. The pneumatic conveying system according to claim 7, wherein, The pneumatic conveying system includes a hopper, a bin pump, a ash silo, an air source pipeline, a first material conveying pipe and a second material conveying pipe. The input end of the bin pump is connected with the outlet of the hopper. The output end of the bin pump and the outlet of the air source pipeline are both connected with one end of the first material conveying pipe. The outlet of the air source pipeline is located upstream of the first material conveying pipe compared with the output end of the bin pump. The other end of the first material conveying pipe is connected with one end of the elbow body of the connecting elbow. One end of the second material conveying pipe is connected with the other end of the elbow body. The other end of the second material conveying pipe is connected with the ash silo. The air inlet end of the turbulent flow valve group of the connecting elbow is connected with the air source pipeline.

9. The pneumatic conveying system according to claim 8, wherein The pneumatic conveying system further includes a feed valve and a discharge valve. Two ends of the feed valve are respectively connected to the input end of the silo pump and the outlet of the ash hopper. Two ends of the discharge valve are respectively connected to the output end of the silo pump and one end of the first material conveying pipe.

10. The pneumatic conveying system according to claim 8, wherein The pneumatic conveying system further includes a balance valve and a switching valve. Two ends of the balance valve are respectively connected to the ash hopper and the silo pump. A connection port is provided on the gas source pipeline. One end of the switching valve is connected to the connection port, and the other end of the switching valve is connected to the air inlet end of the turbulent flow valve group.

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