Pneumatic ash conveying system and using method thereof

Abstract

The invention relates to a pneumatic ash conveying system. Comprising a bin pump, a feeding valve, a gate, an air blowing assembly, an air storage pump, an exhaust valve and a conveying valve, wherein the feeding valve is used for uniformly feeding materials into the bin pump; the gate is used for opening or closing the bin pump; the air blowing assembly is used for blowing air into the bin pump; the blowing assisting assembly is used for blowing air into the conveying pipe; the ash bin is arranged at an ash discharging position; the feeding valve and the gate are arranged at the top of the bin pump; a fifth pipe is arranged between the third pipe and the fourth pipe; a blockage removing valve is arranged on the fifth pipe; the fifth pipe is communicated with the third pipe, and the other end of the fifth pipe is communicated with an ash hopper above the bin pump. The problems that the conveying efficiency of a pneumatic conveying system is unstable due to the fact that a conveying pipeline is prone to being blocked in the conveying and filtering process of the pneumatic conveying system, and serious potential safety hazards exist due to the fact that the air pressure in a filtering device is prone to being too large when a conveying device is blocked are solved.

Description

Technical Field

[0001] The invention relates to the field of pneumatic ash conveying, and in particular to a pneumatic ash conveying system and a use method thereof. Background Art

[0002] In the prior art, pneumatic conveying, also known as air flow conveying, utilizes the energy of air flow to convey granular materials along the direction of air flow in a closed pipe. It is a specific application of fluidization technology. The pneumatic conveying device has a simple structure and is easy to operate. It can be used for horizontal, vertical or inclined conveying. During the conveying process, physical operations such as heating, cooling, drying and air flow classification of materials or certain chemical operations can also be performed simultaneously.

[0003] There are two types of pneumatic conveying systems: pressure and gravity. The pressure conveying system can be divided into negative pressure and positive pressure according to the pressure of the conveyed air. In the negative pressure pneumatic conveying system, under the suction action of the exhaust equipment, the air and the ash in the ash hopper are sucked into the conveying pipeline and sent to the ash unloading facility. The air and ash are separated by the dust collecting device, and the ash is sent to the ash bin through the ash discharge device. The purified air is discharged into the atmosphere through the exhaust equipment. The exhaust equipment of the negative pressure pneumatic conveying system generally adopts a dry negative pressure fan or a water ring vacuum pump. A hydraulic vacuum device can also be used for wet ash discharge.

[0004] The pneumatic conveying systems currently on the market generally have the problem that the transmission pipelines are prone to blockage during the conveying and filtration process, resulting in unstable conveying efficiency of the conveying system. At the same time, when the conveying device is blocked, the air pressure inside the filtering device is prone to be too high, posing a serious safety hazard. Summary of the invention

[0005] The embodiments of the present application provide a pneumatic ash conveying system and a method of using the same, thereby solving the problem in the prior art that the transmission pipeline of the pneumatic conveying system is prone to blockage during the conveying and filtering process, resulting in unstable conveying efficiency of the conveying system. At the same time, when the conveying device is blocked, the air pressure inside the filtering device is prone to be too high, posing a serious safety hazard.

[0006] The technical solution adopted in the embodiments of the present application is as follows.

[0007] A pneumatic ash conveying system comprises a silo pump, a feed valve for uniformly discharging materials into the silo pump, a gate for opening or closing the silo pump, a blowing assembly for blowing air into the silo pump, an air storage pump arranged at the air outlet end of the blowing assembly, an exhaust valve for discharging the pressure in a transmission pipe, a conveying valve for controlling the discharge of materials in the silo pump, a blowing assisting assembly for blowing air into the transmission pipe and an ash silo at an ash unloading location; the feed valve and the gate are both arranged at the top of the silo pump; a first pipe is arranged at the outlet end of the blowing assembly; the first pipe is arranged at the outlet end of the blowing assembly; the second ... A pipe is connected to the inlet of the air storage pump; the outlet end of the air storage pump is connected to the second pipe; the outlet end of the second pipe is connected to the silo pump; a third pipe is connected in parallel to the second pipe; the blowing auxiliary assembly is arranged on the third pipe; a fourth pipe is arranged at the outlet end of the silo pump; the other end of the fourth pipe is connected to the ash silo; a fifth pipe is arranged between the third pipe and the fourth pipe; a drain valve is arranged on the fifth pipe; the fifth pipe is connected to the third pipe, and the other end of the fifth pipe is connected to the ash hopper above the silo pump.

[0008] A method for using pneumatic ash conveying comprises the following steps:

[0009] S1: discharge materials into and out of the silo pump until the materials in the silo pump reach the material level;

[0010] S2: The air blowing component injects compressed air into the air storage pump. When the material level in the silo pump reaches a certain level, the compressed air enters the gasification chamber at the bottom of the silo pump through the second pipe, and then diffuses through the fluidized bed. While the material is fully fluidized, the air pressure in the pump gradually increases.

[0011] S3: When the pressure in the silo pump reaches the set delivery pressure value, the pressure sensor sends a signal, the blow-assisting component opens, and after a delay of a few seconds, the delivery valve automatically opens, the fluidization of the material on the fluidized bed is enhanced, the delivery begins, and the material in the pump gradually decreases;

[0012] S4: When the material in the silo pump is transported, and the pressure drops to or close to the set silo clearing pressure value, the air storage pump and the blowing-assisting assembly are closed, and the delivery valve is closed after a certain delay, thus completing a working cycle.

[0013] As a further improvement of the above technical solution: S1: A further method for feeding and discharging materials into and out of the silo pump until the materials in the silo pump reach the material level is: after the silo pump is put into operation, the feed valve is opened, and the materials fall freely into the pump body, and when the material level meter sends a full material signal or reaches the set time, the feed valve is automatically closed; in this process, the feed time is the main control measure, and the material level meter control is a backup measure; as long as the material level is reached or the feed time is reached, the feed valve is automatically closed.

[0014] As a further improvement of the above technical solution: the further working process of S3: the PLC system automatically identifies the pressure in the conveying pipeline. When the pressure is higher than the alarm pressure, the system automatically opens the drain valve during the conveying process to discharge the pressure in the conveying pipeline to the ash hopper on the upper part of the silo pump, and uses the negative pressure generated when the pressure is emptied to draw back the material blocked in the conveying pipeline and pour it into the ash hopper. When the pressure in the conveying pipeline is lower than the silo clearing pressure, the conveying process is stopped and the pressurization process is carried out. During the conveying process, if the pressure in the pipeline is still at the conveying blockage pressure during the conveying process, the above-mentioned process of opening the drain valve is repeated, and it is circulated repeatedly in sequence until the pressure in the pipeline during the conveying process can be reduced to the silo clearing pressure. At this point, the conveying blockage fault is automatically eliminated by the control system.

[0015] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0016] 1. Due to the use of silo pumps, several groups can be arranged in series. The outlet end of each group of silo pumps is provided with a fourth pipe, and the outlet end of the fourth pipe is connected to the ash silo. A gate and a feed valve are provided on the top of the silo pump. The feed valve controls the amount of material entering the silo pump. A second pipe is provided at the air inlet end of the silo pump, and the second pipe is connected to the air storage pump. The air storage pump is connected to the blowing assembly through the first pipe. The blowing assembly injects compressed air into the air storage pump, and the compressed air is injected into the second pipe through the air storage pump to apply pressure to the silo pump. A third pipe is provided on the second pipe, and the third pipe is connected to the second pipe. The outlet end of the third pipe is connected to the fourth pipe. A blowing assist assembly is provided on the third pipe. The blowing assist assembly is started when the fourth pipe is blocked, so as to clear the blockage in the third pipe. A fifth pipe is provided on the fourth pipe, and the other end of the fifth pipe is connected to the ash hopper above the silo pump, so that the material blocked in the third pipe is circulated and processed, and the pressure is released from the fifth pipe, thereby realizing the dredging of the blockage in the pipeline, and the negative pressure generated when the pressure is emptied is used to back-draw the material blocked in the conveying pipeline.

[0017] 2. Since the feed valve is opened after the silo pump is put into operation, the material falls freely into the pump body. When the material level meter sends a full material signal or reaches the set time, the feed valve is automatically closed. In this process, the feed time is the main control measure, and the material level meter control is the backup measure. As long as the material level is reached or the feeding time is reached, the feed valve is automatically closed. This step is to measure the material. The blowing component injects compressed air into the air storage pump. When the material level in the silo pump is reached, the compressed air enters from the gasification chamber at the bottom of the silo pump through the second pipe, and then diffuses through the fluidized bed. While the material is fully fluidized, the air pressure in the pump gradually rises. This step applies pressure to the silo pump to transport the material. When the pressure in the silo pump reaches the set conveying pressure value, the pressure sensor sends a signal, the blowing component opens, and after a delay of a few seconds, the conveying valve automatically opens, the fluidization of the material on the fluidized bed is enhanced, and the conveying begins. The material in the pump gradually Reduce; this step is to evenly transport the materials when no blockage occurs; when the conveying pipeline is blocked, the PLC system automatically identifies the pressure in the conveying pipeline. When the pressure is higher than the alarm pressure, the system automatically opens the drain valve during the conveying process to discharge the pressure in the conveying pipeline to the ash hopper on the upper part of the silo pump, and uses the negative pressure generated when the pressure is emptied to backdraw the blocked materials in the conveying pipeline and pour them into the ash hopper. When the pressure in the conveying pipeline is lower than the clearing pressure, the conveying process is stopped and the pressurization process is carried out. During the conveying process, if the pressure in the pipeline is still at the conveying blockage pressure during the conveying process, the above-mentioned process of opening the drain valve is repeated, and the cycle is repeated in sequence until the pressure in the pipeline detected during the conveying process can be reduced to the clearing pressure. At this point, the conveying blockage fault is automatically eliminated by the control system, thereby realizing the dredging of the blockage in the pipeline, and using the negative pressure generated when the pressure is emptied to backdraw the blocked materials in the conveying pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the flow of the pneumatic ash conveying system and its use method in the present invention.

[0019] Figure 2 It is a schematic diagram of the flow of the pneumatic ash conveying system and its use method in the present invention.

[0020] In the figure: 1. silo pump; 2. feed valve; 3. gate; 4. blowing assembly; 5. air storage pump; 6. exhaust valve; 7. conveying valve; 8. blowing auxiliary assembly; 9. ash silo; 11. first pipe; 12. second pipe; 13. third pipe; 14. fourth pipe; 15. fifth pipe; 16. drain valve. DETAILED DESCRIPTION

[0021] The embodiments of the present application provide a pneumatic ash conveying system and a method of using the same, thereby solving the problem in the prior art that the transmission pipeline of the pneumatic conveying system is prone to blockage during the conveying and filtering process, resulting in unstable conveying efficiency of the conveying system. At the same time, when the conveying device is blocked, the air pressure inside the filtering device is prone to be too high, posing a serious safety hazard.

[0022] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] A pneumatic ash conveying system comprises a silo pump 1, a feed valve 2 for uniformly discharging materials in the silo pump 1, a gate 3 for opening or closing the silo pump 1, a blowing assembly 4 for blowing air into the silo pump 1, an air storage pump 5 arranged at the air outlet end of the blowing assembly 4, an exhaust valve 6 for discharging the pressure in a transmission pipe, a conveying valve 7 for controlling the discharge of materials in the silo pump 1, a blowing assisting assembly 8 for blowing air into the transmission pipe, and an ash silo 9 at an ash unloading location; the feed valve 2 and the gate 3 are both arranged at the top of the silo pump 1; a first pipe 11 is arranged at the outlet end of the blowing assembly 4; the first pipe 11 is connected to the inlet of the air storage pump 5; the outlet end of the air storage pump 5 is connected to the second pipe 12; the outlet end of the second pipe 12 is connected to the silo pump 1; the second pipe 12 is connected in parallel with the third pipe 13; the blowing assembly 8 is arranged on the third pipe 13; the outlet end of the silo pump 1 is provided with a fourth pipe 14; the other end of the fourth pipe 14 is connected to the ash silo 9; a fifth pipe 15 is arranged between the third pipe 13 and the fourth pipe 14; the fifth pipe 15 is provided with a drain valve 16; the fifth pipe 15 is connected to the third pipe 13, and the other end of the fifth pipe 15 is connected to the ash hopper above the silo pump 1.

[0025] The silo pump 1 can be provided with several groups in series, and the outlet end of each group of silo pumps 1 is provided with a fourth pipe 14, and the outlet end of the fourth pipe 14 is connected to the ash silo 9. The top of the silo pump 1 is provided with a gate 3 and a feed valve 2, and the feed valve 2 controls the amount of material entering the silo pump 1. The air inlet end of the silo pump 1 is provided with a second pipe 12, and the second pipe 12 is connected to the air storage pump 5. The air storage pump 5 is connected to the blowing component 4 through the first pipe 11. The blowing component 4 injects compressed air into the air storage pump 5, and the compressed air is injected into the second pipe 12 through the air storage pump 5. Pressure is applied to the silo pump 1, and a third tube 13 is provided on the second tube 12. The third tube 13 is connected to the second tube 12, and the outlet end of the third tube 13 is connected to the fourth tube 14. A blowing component 8 is provided on the third tube 13. The blowing component 8 is started when the fourth tube 14 is blocked to clear the blockage in the third tube 13. A fifth tube 15 is provided on the fourth tube 14, and the other end of the fifth tube 15 is connected to the ash hopper above the silo pump 1, so that the material blocked in the third tube 13 is circulated and the pressure is released from the fifth tube 15.

[0026] Due to the use of a silo pump 1, several groups can be arranged in series, and the outlet end of each group of silo pumps 1 is provided with a fourth pipe 14, and the outlet end of the fourth pipe 14 is connected to the ash bin 9. The top of the silo pump 1 is provided with a gate 3 and a feed valve 2, and the feed valve 2 controls the amount of material entering the silo pump 1. The air inlet end of the silo pump 1 is provided with a second pipe 12, and the second pipe 12 is connected to the air storage pump 5. The air storage pump 5 is connected to the blowing component 4 through the first pipe 11. The blowing component 4 injects compressed air into the air storage pump 5, and the compressed air is injected into the second pipe 12 through the air storage pump 5, so as to pressurize the silo pump 1. The second pipe 12 is provided with a third The third pipe 13 is connected to the second pipe 12, the outlet end of the third pipe 13 is connected to the fourth pipe 14, the third pipe 13 is provided with a blowing component 8, the blowing component 8 is started when the fourth pipe 14 is blocked, so as to clear the blockage in the third pipe 13, the fourth pipe 14 is provided with a fifth pipe 15, the other end of the fifth pipe 15 is connected to the ash hopper above the silo pump 1, so that the material blocked in the third pipe 13 is circulated and the pressure is released from the fifth pipe 15, thereby clearing the blockage in the pipeline, and using the negative pressure generated when the pressure is emptied to back-pump the blocked material in the conveying pipeline.

[0027] The method for using pneumatic ash conveying in this embodiment comprises the following steps:

[0028] S1: discharge materials into and out of the silo pump until the materials in the silo pump reach the material level;

[0029] S2: The air blowing component injects compressed air into the air storage pump. When the material level in the silo pump reaches a certain level, the compressed air enters the gasification chamber at the bottom of the silo pump through the second pipe, and then diffuses through the fluidized bed. While the material is fully fluidized, the air pressure in the pump gradually increases.

[0030] S3: When the pressure in the silo pump reaches the set delivery pressure value, the pressure sensor sends a signal, the blow-assisting component opens, and after a delay of a few seconds, the delivery valve automatically opens, the fluidization of the material on the fluidized bed is enhanced, the delivery begins, and the material in the pump gradually decreases;

[0031] S4: When the material in the silo pump is transported, and the pressure drops to or close to the set silo clearing pressure value, the air storage pump and the blowing-assisting assembly are closed, and the delivery valve is closed after a certain delay, thus completing a working cycle.

[0032] S1: A further method for feeding and discharging materials into and out of the silo pump until the materials in the silo pump reach the material level is as follows: after the silo pump is put into operation, the feed valve is opened, and the materials fall freely into the pump body. When the material level meter sends a full material signal or reaches the set time, the feed valve is automatically closed. In this process, the feed time is the main control measure, and the material level meter control is the backup measure. As long as the material level is reached or the feed time is reached, the feed valve is automatically closed.

[0033] Further working process of S3: PLC system automatically identifies the pressure in the conveying pipeline. When the pressure is higher than the alarm pressure, the system automatically opens the drain valve during the conveying process to discharge the pressure in the conveying pipeline to the ash hopper on the upper part of the silo pump. The negative pressure generated when the pressure is emptied is used to draw back the blocked materials in the conveying pipeline and pour them into the ash hopper. When the pressure in the conveying pipeline is lower than the silo clearing pressure, the conveying process is stopped and the pressurization process is carried out. During the conveying process, if the pressure in the pipeline is still at the conveying blocking pressure during the conveying process, the above-mentioned process of opening the drain valve is repeated, and the cycle is repeated in sequence until the pressure in the pipeline during the conveying process can be reduced to the silo clearing pressure. At this point, the conveying blocking fault is automatically eliminated by the control system.

[0034] After the silo pump 1 is put into operation, the feed valve 2 is opened, and the material falls freely into the pump body. When the material level meter sends a full material signal or reaches the set time, the feed valve 2 is automatically closed. In this process, the feed time is the main control measure, and the material level meter control is the backup measure. As long as the material level is reached or the feeding time is reached, the feed valve 2 is automatically closed. This step is to meter the material. The blowing component 4 injects compressed air into the air storage pump 5. When the material level in the silo pump 1 is reached, the compressed air enters from the gasification chamber at the bottom of the silo pump 1 through the second pipe 12, and then diffuses through the fluidized bed. While the material is fully fluidized, the air pressure in the pump gradually increases. This step applies pressure to the silo pump 1 to transport the material. When the pressure in the silo pump 1 reaches the set conveying pressure value, the pressure sensor sends a signal, the blowing component 8 opens, and after a delay of a few seconds, the conveying valve 7 automatically opens. The fluidization of the material on the fluidized bed is strengthened, the conveying begins, and the material in the pump gradually decreases; this step is to uniformly convey the material when no blockage occurs; when the conveying pipeline is blocked, the PLC system automatically identifies the pressure in the conveying pipeline. When the pressure is higher than the alarm pressure, the system automatically opens the drain valve 16 during the conveying process to discharge the pressure in the conveying pipeline to the upper ash hopper of the silo pump 1, and uses the negative pressure generated when the pressure is emptied to backdraw the blocked material in the conveying pipeline and pour it into the ash hopper. When the pressure in the conveying pipeline is lower than the clearing pressure, the conveying process is stopped and the pressurization process is carried out. During the conveying process, if the pressure in the pipeline is still at the conveying blocking pressure during the conveying process, the above process of opening the drain valve 16 is repeated, and it is circulated repeatedly in sequence until the pressure in the pipeline detected during the conveying process can be reduced to the clearing pressure. At this point, the conveying blockage fault is automatically eliminated by the control system.

[0035] Since the feed valve 2 is opened after the silo pump 1 is put into operation, the material falls freely into the pump body, and when the material level meter sends a full material signal or reaches the set time, the feed valve 2 is automatically closed; in this process, the feed time is the main control measure, and the material level meter control is the backup measure; as long as the material level is reached or the feeding time is reached, the feed valve 2 is automatically closed; this step is to meter the material; the blowing component 4 injects compressed air into the air storage pump 5, and when the material level in the silo pump 1 is reached, the compressed air enters from the gasification chamber at the bottom of the silo pump 1 through the second pipe 12, and then diffuses through the fluidized bed. While the material is fully fluidized, the air pressure in the pump gradually increases; this step applies pressure to the silo pump 1 to transport the material; when the pressure in the silo pump 1 reaches the set conveying pressure value, the pressure sensor sends a signal, the blowing component 8 opens, and after a delay of a few seconds, the conveying valve 7 automatically opens, the fluidization of the material on the fluidized bed is enhanced, and the conveying begins. The material gradually decreases; this step is to evenly transport the material when no blockage occurs; when the conveying pipeline is blocked, the PLC system automatically identifies the pressure in the conveying pipeline. When the pressure is higher than the alarm pressure, the system automatically opens the drain valve 16 during the conveying process to discharge the pressure in the conveying pipeline to the upper ash hopper of the silo pump 1, and uses the negative pressure generated when the pressure is emptied to backdraw the blocked material in the conveying pipeline and pour it into the ash hopper. When the pressure in the conveying pipeline is lower than the clearing pressure, the conveying process is stopped and the pressurization process is performed. During the conveying process, if the pressure in the pipeline is still at the conveying blocking pressure during the conveying process, the above process of opening the drain valve 16 is repeated, and the cycle is repeated in sequence until the pressure in the pipeline detected during the conveying process can be reduced to the clearing pressure. At this point, the conveying blockage fault is automatically eliminated by the control system, thereby achieving dredging of the blockage in the pipeline, and backdrawing the blocked material in the conveying pipeline by using the negative pressure generated when the pressure is emptied.

[0036] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A pneumatic ash conveying system, characterized in that: The invention comprises a silo pump (1), a feed valve (2) for uniformly discharging materials into the silo pump (1), a gate (3) for opening or closing the silo pump (1), a blowing assembly (4) for blowing air into the silo pump (1), an air storage pump (5) arranged at the air outlet end of the blowing assembly (4), an exhaust valve (6) for discharging the pressure in a transmission pipe, a conveying valve (7) for controlling the discharge of materials in the silo pump (1), an auxiliary blowing assembly (8) for blowing air into the transmission pipe, and an ash bin (9) at an ash unloading location; the feed valve (2) and the gate (3) are both arranged at the top of the silo pump (1); a first pipe (11) is arranged at the outlet end of the blowing assembly (4); the first pipe (11) is connected to the inlet of the air storage pump (5); The outlet of the air storage pump (5) is connected to a second pipe (12); the outlet of the second pipe (12) is connected to the silo pump (1); a third pipe (13) is connected in parallel to the second pipe (12); the blowing auxiliary assembly (8) is arranged on the third pipe (13); a fourth pipe (14) is arranged at the outlet of the silo pump (1); the other end of the fourth pipe (14) is connected to the ash silo (9); a fifth pipe (15) is arranged between the third pipe (13) and the fourth pipe (14); a drain valve (16) is arranged on the fifth pipe (15); the fifth pipe (15) is connected to the third pipe (13), and the other end of the fifth pipe (15) is connected to the ash hopper above the silo pump (1).

2. A method for using pneumatic ash conveying, characterized in that: The following steps are involved: S1: discharge materials into and out of the silo pump until the materials in the silo pump reach the material level; S2: The air blowing component injects compressed air into the air storage pump. When the material level in the silo pump reaches a certain level, the compressed air enters the gasification chamber at the bottom of the silo pump through the second pipe, and then diffuses through the fluidized bed. While the material is fully fluidized, the air pressure in the pump gradually increases. S3: When the pressure in the silo pump reaches the set delivery pressure value, the pressure sensor sends a signal, the blow-assisting component opens, and after a delay of a few seconds, the delivery valve automatically opens, the fluidization of the material on the fluidized bed is enhanced, the delivery begins, and the material in the pump gradually decreases; S4: When the material in the silo pump is transported, and the pressure drops to or close to the set silo clearing pressure value, the air storage pump and the blowing-assisting assembly are closed, and the delivery valve is closed after a certain delay, thus completing a working cycle.

3. The method for using pneumatic ash conveying as claimed in claim 2, characterized in that: S1: A further method for feeding and discharging materials into and out of the silo pump until the materials in the silo pump reach the material level is as follows: after the silo pump is put into operation, the feed valve is opened, and the materials fall freely into the pump body. When the material level meter sends a full material signal or reaches the set time, the feed valve is automatically closed. In this process, the feed time is the main control measure, and the material level meter control is the backup measure. As long as the material level is reached or the feed time is reached, the feed valve is automatically closed.

4. The method for using pneumatic ash conveying as claimed in claim 2, characterized in that: Further working process of S3: PLC system automatically identifies the pressure in the conveying pipeline. When the pressure is higher than the alarm pressure, the system automatically opens the drain valve during the conveying process to discharge the pressure in the conveying pipeline to the ash hopper on the upper part of the silo pump, and uses the negative pressure generated when the pressure is emptied to draw back the blocked material in the conveying pipeline and pour it into the ash hopper. When the pressure in the conveying pipeline is lower than the silo clearing pressure, the conveying process is stopped and the pressurization process is carried out. During the conveying process, if the pressure in the pipeline is still at the conveying blocking pressure during the conveying process, the above-mentioned process of opening the drain valve is repeated, and it is circulated repeatedly in sequence until the pressure in the pipeline during the conveying process can be reduced to the silo clearing pressure. At this point, the conveying blocking fault is automatically eliminated by the control system.

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