Pneumatic ash conveying system

Abstract

The invention discloses a pneumatic ash conveying system, and relates to the technical field of pneumatic conveying. According to the technical key points, the device comprises a bin pump, a feeding pipe of the bin pump is connected with a plurality of ash hoppers of a power plant, and ash discharged by the ash hoppers can be collected at the same time through the bin pump; an air inlet of the bin pump is connected with an air supply unit, and the air supply unit can convey compressed air into a sending chamber of the bin pump; the discharging end of the bin pump is connected with one end of the main ash conveying pipe, and the other end of the main ash conveying pipe is connected with the ash bin; the main ash conveying pipe is provided with a blocking blowing pipeline, and the blocking blowing pipeline can blow pressure gas into the main ash conveying pipe and is used for conducting blocking blowing operation on the blocking position in the main ash conveying pipe. The blockage blowing pipeline arranged on one side of the main ash conveying pipe can blow pressure gas into the blockage blowing pipeline, and the blockage blowing pipeline and original compressed air in the main ash conveying pipe achieve the effect of dredging the main ash conveying pipe under the condition that the pipeline is not damaged.

Description

Technical Field

[0001] This application relates to the field of pneumatic conveying technology, and in particular to a pneumatic ash conveying system. Background Technology

[0002] The pneumatic ash conveying system in power plants is an automated device that uses compressed air to transport fly ash in a closed pipeline. It is mainly used for the collection and transfer of dry ash from the ash hopper of the boiler dust collector in thermal power plants. During normal operation of the power plant boiler, the fly ash generated is deposited at the outlet of the electrostatic precipitator and falls through the ash hopper into the silo pump installed below the dust collector. Then, the silo pump uses pneumatic force to transport the fly ash along the ash conveying pipe to the ash silo.

[0003] During the operation of pneumatic ash conveying systems, blockages are inevitable due to factors such as internal wear of the conveying pipes, coarse and unevenly distributed settling ash particles generated during boiler soot blowing, ash moisture content exceeding 6%, or foreign matter contamination. If this problem is not effectively addressed, it can jeopardize the safety of the entire system to varying degrees, posing significant safety hazards. Therefore, it is essential to provide a pneumatic ash conveying system that can help enterprises resolve pipe blockage issues. Summary of the Invention

[0004] This application provides a pneumatic ash conveying system that can help the production unit clear the pipeline in a timely manner when a blockage occurs in the pneumatic ash conveying system.

[0005] The above-mentioned objective of this application is achieved through the following technical solution: A pneumatic ash conveying system includes a silo pump, the feed pipe of which is connected to multiple ash hoppers of a power plant, and the silo pump can simultaneously collect ash discharged from multiple ash hoppers. The air inlet of the chamber pump is connected to an air supply unit, which can deliver compressed air to the sending chamber of the chamber pump. The discharge end of the silo pump is connected to one end of the main ash conveying pipe, and the other end of the main ash conveying pipe is connected to the ash silo. The main ash conveying pipe is equipped with a blow-blocking pipeline, which can spray pressurized gas into the main ash conveying pipe to blow-block the plug positions inside the main ash conveying pipe.

[0006] Furthermore, the air supply unit includes a first conveying fan, the outlet of which is connected to the main air supply pipe, and a first compressed air delivery pipe is connected to the main air supply pipe. The end of the first compressed air delivery pipe away from the first conveying fan is connected to the air inlet of the chamber pump.

[0007] Furthermore, there are three ash hoppers, one of which has its outlet connected to the upper port of the feed pipe of the silo pump, and an inclined ash guide pipe is fixedly connected to one side of the feed pipe of the silo pump. The outlets of the other two ash hoppers are respectively connected to different positions along the length of the ash guide pipe.

[0008] Furthermore, a second compressed air delivery pipe is connected to the highest end of the ash guide pipe, which can deliver compressed air into the ash guide pipe.

[0009] Furthermore, the inlet end of the second compressed air delivery pipe is connected to the main air supply pipe.

[0010] Furthermore, the blow-off pipeline includes a plurality of blow-off aids spaced apart on the main ash conveying pipe. Each blow-off aid is connected to an air tracing pipe, and one end of the air tracing pipe is connected to a second conveying fan, which provides compressed air to the blow-off aids.

[0011] Furthermore, the blowing aid device is specifically a pilot-operated automatic plugging valve.

[0012] Furthermore, a low-pressure pipe is connected to one end of the main ash conveying pipe near the ash silo, and pneumatic ball valves are provided on the pipe section of the main ash conveying pipe behind the connection point with the low-pressure pipe and on the low-pressure pipe.

[0013] Furthermore, the end of the low-pressure pipe furthest from the main ash conveying pipe is connected to the inlet of the power plant dust collector.

[0014] Furthermore, electromagnetic control valves are installed on the main air supply pipe, the first compressed air delivery pipe, the second compressed air delivery pipe, and the tracing air pipe.

[0015] In summary, this application includes at least one of the following beneficial technical effects: The silo pump of this application can simultaneously collect ash discharged from multiple ash hoppers, thus reducing the amount of pipelines required for the pneumatic ash conveying system on-site. Consequently, the overall system failure rate and the overall cost of the pneumatic ash conveying system can be reduced. When the silo pump becomes clogged during use, the blowing pipeline installed on one side of the main ash conveying pipe can blow pressurized gas into it. This gas, together with the existing compressed air in the main ash conveying pipe, can clear the blockage without damaging the pipeline, ensuring the safety and reliability of the entire system during use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this application.

[0018] Reference numerals in the attached drawings: 1. Silo pump; 2. Ash hopper; 3. Air supply unit; 31. First conveying fan; 32. Main air supply pipe; 33. First compressed air conveying pipe; 4. Main ash conveying pipe; 5. Ash silo; 6. Blow-out pipe; 61. Auxiliary blowing device; 62. Tracing air pipe; 63. Second conveying fan; 7. Ash guide pipe; 8. Second compressed air conveying pipe; 9. Low-pressure pipe; 10. Pneumatic ball valve; 11. Electromagnetic control valve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0020] like Figure 1 As shown, this application discloses a pneumatic ash conveying system, which includes a silo pump 1. The feed pipe of the silo pump 1 is connected to multiple ash hoppers 2 of the power plant. The silo pump 1 can collect the ash discharged from multiple ash hoppers 2 at the same time. The air inlet of the chamber pump 1 is connected to an air supply unit 3, which can deliver compressed air to the sending chamber of the chamber pump 1. The discharge end of the silo pump 1 is connected to one end of the main ash conveying pipe 4, and the other end of the main ash conveying pipe 4 is connected to the ash silo 5. A blow-blocking pipe 6 is installed on the main ash conveying pipe 4. The blow-blocking pipe 6 can spray pressurized gas into the main ash conveying pipe 4 to blow-block the plug positions in the main ash conveying pipe 4.

[0021] In the above embodiments, there are often more than one ash hopper 2 in the power plant. Typically, a silo pump 1 is installed under each ash hopper 2, and each silo pump 1 requires a gas supply pipeline connected from the gas supply equipment. This not only requires the production enterprise to purchase more silo pumps 1, increasing enterprise expenses, but also increases the failure rate and space occupation due to the increased pipeline layout, and makes maintenance inconvenient. In the ash conveying system of this application, one silo pump 1 can simultaneously collect ash discharged from multiple ash hoppers 2. This not only reduces the number of silo pumps 1 purchased, but also simplifies the on-site pipeline layout, thereby effectively reducing the equipment failure rate. The ash from different ash hoppers 2 is first collected in the same silo pump 1, and then uniformly transported to the ash silo 5 along the main ash conveying pipe 4 from the sending chamber within that silo pump 1. Compared to the prior art method of connecting the silo pumps 1 under each ash hopper 2 in series, it is more convenient for enterprises to adjust the ash flow rate in the main ash conveying pipe 4, and the risk of pipeline blockage is also reduced.

[0022] The main ash conveying pipe 4 is the primary path for material transport between the silo pump 1 and the ash silo 5, and it is also the main location where pipe blockages occur. Therefore, this application adds a blow-off pipe 6 to the main ash conveying pipe 4. The blow-off pipe 6 can spray pressurized gas into the main ash conveying pipe 4, which, together with the existing pressurized gas in the main ash conveying pipe 4, acts on the blockage point. By causing a sudden increase in pressure on one side of the blockage point, the gas is forced open within the main ash conveying pipe 4, thereby achieving the effect of unblocking the main ash conveying pipe 4. Since the blockage point in the pipe is opened by gas, this will not cause damage to the pipe.

[0023] Furthermore, such as Figure 1 As shown, the air supply unit 3 includes a first conveying fan 31. The air outlet of the first conveying fan 31 is connected to the main air supply pipe 32. A first compressed air conveying pipe 33 is connected to the main air supply pipe 32. The end of the first compressed air conveying pipe 33 away from the first conveying fan 31 is connected to the air inlet of the chamber pump 1.

[0024] In the above embodiments, the first conveying fan 31 of this application consists of an air compressor and a dryer. It delivers pressurized dry air to the silo pump 1 through the main air supply pipe 32 and the first compressed air conveying pipe 33, thereby providing power to the silo pump 1 to send the ash material in its delivery chamber to the ash silo 5 along the main ash conveying pipe 4.

[0025] Air compressors are a common type of air compression equipment that can generate air at the required pressure. However, if the air compressor draws in air with high humidity, the moisture in the air will decrease in temperature as the air pressure increases during the compression process. When the dew point temperature is reached, the moisture will condense into liquid water. If the compressed air generated by the air compressor is directly sent to the silo pump 1, it may cause the ash material to become damp after contact with it, increasing its adhesion. During the conveying process, the particles will continuously agglomerate, and the frictional resistance with the pipeline will also increase, eventually leading to blockage of the main ash conveying pipe 4. Therefore, a dryer needs to be connected to the air compressor outlet to treat the moisture in the compressed air.

[0026] Furthermore, such as Figure 1 As shown, there are three ash hoppers 2. The discharge port of one ash hopper 2 is connected to the upper port of the feed pipe of the silo pump 1. An inclined ash guide pipe 7 is fixedly connected to one side of the feed pipe of the silo pump 1. The discharge ports of the other two ash hoppers 2 are respectively connected to different positions along the length of the ash guide pipe 7.

[0027] In the above embodiments, the ash guide pipe 7 of this application is a closed pipe in an inclined state (its state can be achieved by setting supports of different heights at both ends of the ash guide pipe 7). The ash hoppers 2 of the power plant are usually located at the same height. Since the ash guide pipe 7 is in an inclined state, the height of the ash guide pipe 7 corresponding to the discharge port of different ash hoppers 2 will be different. In order to make the ash material in the ash hopper 2 flow smoothly along the vertical direction to the ash guide pipe 7, an extension pipe can be set according to the distance between the ash hopper 2 and the ash guide pipe 7 directly below it, which is responsible for conveying the ash material in the ash hopper 2 to the ash guide pipe 7. The lower end of the ash guide pipe 7 is connected to the feed pipe of the silo pump 1, and their connection point is located below the discharge port valve of the ash hopper 2 above the feed pipe of the silo pump 1. A feeder is also provided on the feed pipe of the silo pump 1 below the connection point between it and the ash guide pipe 7. In addition to controlling the conveying amount of the silo pump 1 by operating the valves under different ash hoppers 2, the amount of ash material output from the three ash hoppers 2 can also be uniformly controlled by the feeder.

[0028] Furthermore, such as Figure 1 As shown, the highest end of the ash guide pipe 7 is connected to a second compressed air delivery pipe 8, which can deliver compressed air into the ash guide pipe 7.

[0029] In the above embodiments, after the ash material discharged from the two ash hoppers 2 connected to the ash guide pipe 7 falls into the ash guide pipe 7, it mainly relies on its own gravity to move downward along the ash guide pipe 7. However, during this process, the inner wall of the ash guide pipe 7 will come into contact with the ash particles and generate friction on them. The direction of the friction is opposite to the target direction of the ash material movement (the target of the ash material movement along the ash guide pipe 7 is the silo pump 1). This will hinder the movement of the ash material, and in severe cases, it may even cause blockage in the ash guide pipe 7.

[0030] Therefore, this application connects a second compressed air delivery pipe 8 to the highest end of the water guide pipe. Compressed air can be blown into the closed ash guide pipe 7 through the second compressed air delivery pipe 8. The compressed air is used to increase the kinetic energy of the ash material in the ash guide pipe 7, so as to help the ash material flow efficiently through the ash guide pipe 7 to the silo pump 1.

[0031] Furthermore, such as Figure 1 As shown, the air inlet of the second compressed air delivery pipe 8 is connected to the main air supply pipe 32.

[0032] In the above embodiments, the compressed air required for the second compressed air delivery pipe 8 is also drawn from the first delivery fan 31, which saves the trouble of supplying air separately to the second compressed air delivery pipe 8.

[0033] Furthermore, such as Figure 1 As shown, the blow-blocking pipeline 6 includes multiple blowing aids 61 spaced apart on the main ash conveying pipe 4. Each blowing aid 61 is connected to an air tracing pipe 62. One end of the air tracing pipe 62 is connected to a second conveying fan 63, which provides compressed air to the blowing aids 61.

[0034] In the above embodiments, taking a main ash conveying pipe 4 with a length of 300 meters and a diameter of 100 mm as an example, the installation positions of two adjacent auxiliary blowing devices 61 on the main ash conveying pipe 4 should not exceed 4 meters. This ensures that when the main ash conveying pipe 4 is blocked, the nearest auxiliary blowing device 61 can be found at the blockage point. In actual installation, the production enterprise can also adjust the specific arrangement position of the auxiliary blowing devices 61 on the pipeline according to the actual site conditions. For example, if the first 50% of the main ash conveying pipe 4 near the silo pump 1 is prone to blockage, the auxiliary blowing devices 61 can be mainly set in the first half of the main ash conveying pipe 4, and the number of auxiliary blowing devices 61 can be reduced in the second half of the main ash conveying pipe 4, thus avoiding redundant installation.

[0035] The second conveying fan 63 of this application, like the first conveying fan 31, consists of an air compressor and a dryer. The compressed air generated by the air compressor is dried by the dryer and then delivered to the air tracing pipe 62. The air tracing pipe 62 distributes this compressed air to each blowing device 61. The reason why this application chooses to add a separate air compressor for the blowing pipe 6 instead of connecting a pipe from the main air supply pipe 32 to supply air to the air tracing pipe 62 is that during the process of conveying ash material, the air pressure in the main ash conveying pipe 4 will fluctuate with the material concentration and pipe resistance. Correspondingly, the compressed air pressure distributed to other equipment will also fluctuate. If the blowing pipe 6 and the ash conveying pipe share the same air source, the air pressure in the blowing pipe 6 will be unstable, resulting in a decrease in the clearing effect. When blockage occurs, the blowing device needs to quickly release a high-pressure airflow of about 0.7MPa within 0.1 to 0.3 seconds to quickly impact the blockage material. An independent air source can ensure that the high-pressure airflow ejected by the blowing device 61 is constant.

[0036] Furthermore, such as Figure 1 As shown, the blowing device 61 is specifically a pilot-operated automatic plugging valve.

[0037] In the above embodiments, the pilot-operated automatic throttling valve is equipped with a pressure gauge to monitor the pressure in the main ash conveying pipe 4 at its installation location. When the flow of ash material in the main ash conveying pipe 4 is obstructed, that is, when a plug forms in the main ash conveying pipe 4, the local pressure in the main ash conveying pipe 4 increases. When the pressure exceeds the set threshold of the pilot-operated automatic throttling valve (the threshold of a conventional pilot-operated automatic throttling valve is set at about 0.3 MPa, that is, when the pressure in the pipeline reaches 0.3 MPa, the pilot-operated automatic throttling valve can start working), the pressure difference in the valve will push the valve core of the pilot-operated automatic throttling valve to move, opening the main valve channel. The high-pressure gas flow will quickly be injected into the blockage point of the main ash conveying pipe 4 through the valve body. After the blockage point is cleared and the flow of ash material in the main ash conveying pipe 4 returns to normal, the pilot-operated automatic throttling valve will automatically close to avoid continuous gas consumption.

[0038] The pilot-operated automatic plugging valve can automatically detect the pressure inside the main ash conveying pipe 4. When the pressure in the pipe reaches the pressure required to open the automatic plugging device, pressurized gas is automatically injected into the pipe to effectively treat the blockage at the corresponding location. It automatically closes after the main ash conveying pipe 4 is restored. This eliminates the hassle of manual inspection of pipe blockages (a common method in enterprises is for workers to use a hammer to tap along the main ash conveying pipe 4 to locate the blockage through sound, and then take appropriate measures to remove it). Both the efficiency of clearing blockages and the safety of the ash conveying system are effectively improved.

[0039] Furthermore, such as Figure 1As shown, a low-pressure pipe 9 is connected to one end of the main ash conveying pipe 4 near the ash silo 5. Pneumatic ball valves 10 are installed on the pipe section of the main ash conveying pipe 4 behind the connection point with the low-pressure pipe 9 and on the low-pressure pipe 9.

[0040] In the above embodiments, a low-pressure pipe 9 is connected to the end of the main ash conveying pipe 4 (i.e., the side of the main ash conveying pipe 4 near the silo). The pressure in the low-pressure pipe 9 is at least lower than the pressure in the main ash conveying pipe 4. Specifically, the low-pressure pipe 9 can be maintained at the required low pressure by connecting it to a negative pressure device and a negative pressure pipeline. In this way, when the main ash conveying pipe 4 is blocked, even if the blowing device 61 fails, the pneumatic ball valve 10 on the low-pressure pipe 9 can be opened. After the low-pressure pipe 9 and the main ash conveying pipe 4 are connected, the low-pressure pipe 9 depressurizes the pipeline on the side of the blockage point in the main ash conveying pipe 4 near the ash silo 5, forming a pressure difference on both sides of the blockage point. At the same time, the low-pressure pipe 9 itself will also use suction force to peel off the ash material on the surface of the blockage point on the side of the ash silo 5, thereby gradually clearing the blockage point in the main ash conveying pipe 4.

[0041] In most cases, the blowing device 61 works normally and can handle most ash blockage problems in the main ash conveying pipe 4. When a blockage occurs that the blowing device 61 cannot handle, on-site technicians can close the pneumatic ball valve 10 on the main ash conveying pipe 4 and open the pneumatic ball valve 10 on the low-pressure pipe 9. At this time, the low-pressure pipe 9 is connected to the main ash conveying pipe 4. The connection point between the negative pressure pipe and the main ash conveying pipe 4 is located at the end of the main ash conveying pipe 4. Blockage in pneumatic conveying pipelines often occurs in the initial section of the main ash conveying pipe 4 at the outlet of the silo pump 1 transmitter. This is because the ash flow rate is low, the concentration is high, and the flow pattern is unstable in the initial section. This ensures that the connection point between the negative pressure pipe and the main ash conveying pipe 4 is always located on the side of the plugging point closer to the ash silo 5. After the low-pressure pipe 9 and the main ash conveying pipe 4 are connected, the pressure on the side of the plugging point in the main ash conveying pipe 4 closer to the ash silo 5 will also become low pressure. After the blowing device 61, which is close to the silo pump 1 on the side of the plugging point, is started, the pressure difference on both sides of the plugging point will generate greater squeezing force, which helps to improve the ability of this application to clear the plugging point in the main ash conveying pipe 4.

[0042] Furthermore, such as Figure 1 As shown, the end of the low-pressure pipe 9 furthest from the main ash conveying pipe 4 is connected to the inlet of the power plant dust collector.

[0043] In the above embodiments, the flue gas from the power plant boiler contains a large amount of dust particles. If these dust particles are directly discharged into the atmosphere, it will inevitably cause air pollution. Therefore, the power plant uses a dust collector to treat the dust particles in the flue gas before it is discharged, in order to achieve ultra-low emission targets. The exhaust gas discharged from the boiler is sent to the dust collector by an induced draft fan. Therefore, the exhaust gas flows at high speed at the inlet of the dust collector. Taking the electrostatic precipitator commonly used in power plants as an example, the flue gas velocity at the inlet of the electrostatic precipitator can reach about 10 meters per second. According to the Bernoulli equation principle in fluid mechanics, the higher the fluid velocity, the lower the pressure at its location. Compared with the fluid, the surrounding gas with a lower velocity or that is stationary is under high pressure. At this time, a pressure difference is generated between the two, and the gas with a higher velocity will exert a suction force on the surrounding gas.

[0044] One end of the low-pressure pipe 9 in this application is connected to the pipe section at the inlet of the power plant dust collector, and the other end of the low-pressure pipe 9 is connected to the main ash conveying pipe 4. When the main ash conveying pipe 4 is blocked, the pneumatic ball valve 10 on the low-pressure pipe 9 is opened and the pneumatic ball valve 10 on the main ash conveying pipe 4 is closed. The space between the blockage point in the main ash conveying pipe 4 near the ash hopper 5 and the pneumatic ball valve 10 on it will be connected to the dust collector inlet pipe through the low-pressure pipe 9. The air in the space between the blockage point in the main ash conveying pipe 4 near the ash hopper 5 and the pneumatic ball valve 10 on it is equivalent to a high-pressure zone compared with the air at the dust collector inlet. The pipe at the inlet of the electrostatic precipitator will generate a suction force on the space near the blockage point near the ash hopper 5 through the low-pressure pipe 9. This force helps to peel off the powder material near the ash hopper 5 in the main ash conveying pipe 4. On the other hand, the blowing device 61 on the side of the blockage point near the silo pump 1 will be activated, impacting the blockage point from the other side. While the compressed air impacts, it will also peel off the powder on the surface of the blockage point. In this way, powder peeling points can appear on both sides of the blockage point at the same time, which helps to gradually thin the blockage point. As the thickness of the blockage point decreases, the pressure difference formed by the high-pressure area generated by the blowing device 61 and the low-pressure area generated by the suction at the dust collector inlet can quickly and efficiently clear the blockage point. Thus, even when faced with rare stubborn blockage points, the pneumatic ash conveying system of this application can easily cope with them.

[0045] Taking the DN100 main ash conveying pipe 4 as an example, the compressed air blown out by the auxiliary blowing device 61 generates a high-pressure zone of 0.3MPa on the side of the blockage point near the ash hopper 5. The standard air density is based on 1.225 kg / m³ (this value is the air density under normal temperature and pressure), and the flue gas velocity at the dust collector inlet is based on 10m / s. The air velocity on the side of the blockage point near the ash hopper 5 in the main ash conveying pipe 4 is assumed to be stationary. After connecting the low-pressure pipe 9 between the main ash conveying pipe 4 and the dust collector inlet, without considering the change in height, it can be calculated from the relevant formula in Bernoulli's principle that the low-pressure pipe 9 can generate a suction force of about 70Pa on the main ash conveying pipe 4. If the power plant uses a negative pressure electrostatic precipitator, this pressure difference will be even greater.

[0046] If the main ash conveying pipe 4 is DN100, the space near the ash hopper 5 at the blockage point will exert a suction force of 100 Pa on the low-pressure pipe 9 (this pressure is far lower than the standard atmospheric pressure of 101 kPa). According to the pressure difference formula: (1) Where P1 is the pressure value of the blockage point near the silo pump 1, and P2 is the pressure value of the blockage point near the ash silo 5; Substituting P1=0.3MPa and P2=100Pa into equation (1), we can calculate =299900Pa.

[0047] The DN100 main ash conveying pipe 4 indicates that the pipe has a nominal diameter of 100mm. Ignoring the wall thickness, according to the formula for the area of ​​a circle: (2) Where A is the cross-sectional area of ​​the main ash conveying pipe 4, and r is the radius of the main ash conveying pipe 4; based on the diameter of the main ash conveying pipe 4, r can be calculated to be 0.05m. Substituting this into equation (2), the cross-sectional area of ​​the main ash conveying pipe 4 can be calculated to be 0.007854m². 2 .

[0048] The formula for calculating pressure in fluid mechanics is: (3) Substituting the pressure difference value obtained in equation (1) and the cross-sectional area of ​​the main ash conveying pipe 4 obtained in equation (2) into equation (3), we can obtain F as 2355.41N. This value is the impact force generated at the blockage point when the main ash conveying pipe 4 is blocked. This value is sufficient to open up most of the blockage points of ash material in the main ash conveying pipe 4.

[0049] Furthermore, such as Figure 1 As shown, electromagnetic control valves 11 are installed on the main air supply pipe 32, the first compressed air delivery pipe 33, the second compressed air delivery pipe 8, and the tracing air pipe 62.

[0050] In the above embodiments, by installing an electromagnetic control valve 11 on the above-mentioned pipeline, the production unit can conveniently control the on / off state of different pipelines as needed.

[0051] The implementation principle of this embodiment is as follows: When the pneumatic ash conveying system of this application is in use, when any ash hopper 2 connected to the silo pump 1 or when they all have a discharge requirement, its discharge port is opened, and the silo pump 1 is started to use the compressed air supplied by the first conveying fan 31 to convey the ash material to the ash silo 5 along the main ash conveying pipe 4.

[0052] When a blockage occurs in the main ash conveying pipe 4, the auxiliary blowing device 61 near the blockage point on the side close to the silo pump 1 will automatically start when the pressure at the blockage point reaches its preset value. The compressed air supplied by the second conveying fan 63 will be used to pulse and clear the blockage at the blockage point. After the blockage at the main ash conveying pipe 4 is cleared, its internal pressure will return to normal. At this time, the second conveying fan 63 and the auxiliary blowing device 61 will stop working, and the pneumatic ash conveying system will return to normal operation.

[0053] If the pressure gauge at the blower 61 still does not recover after continuously supplying compressed air to the plug point for 3-5 minutes, the technician can close the pneumatic ball valve 10 on the main ash conveying pipe 4 and open the pneumatic ball valve 10 on the low-pressure pipe. At this time, the air inlet pipe at the dust collector inlet of the power plant is connected to the space on the side of the plug point near the ash hopper on the main ash conveying pipe 4, and the pressure in the space on the side of the plug point near the ash hopper 5 is reduced, thereby increasing the pressure difference on both sides of the plug point. At the same time, the blower 61 and the low-pressure pipe 9 have a peeling effect on the powder on the surface of the plug point from both sides, which can further improve the unblocking effect of the plug point in the main ash conveying pipe 4. Since the main function of the power plant dust collector is to separate and collect ash in the gas, even if it enters the dust collector along the low-pressure pipe 9 after the plug point is flushed out, it will not have an adverse effect on the dust collector.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A pneumatic ash conveying system, characterized in that: Includes a silo pump (1), the feed pipe of which is connected to multiple ash hoppers (2) of the power plant, and the silo pump (1) can collect the ash discharged from multiple ash hoppers (2) at the same time; The air inlet of the chamber pump (1) is connected to an air supply unit (3), which can deliver compressed air to the sending chamber of the chamber pump (1). The discharge end of the silo pump (1) is connected to one end of the main ash conveying pipe (4), and the other end of the main ash conveying pipe (4) is connected to the ash silo (5); The main ash conveying pipe (4) is equipped with a blow-blocking pipe (6), which can spray pressurized gas into the main ash conveying pipe (4) to blow-block the plug position in the main ash conveying pipe (4).

2. The pneumatic ash conveying system according to claim 1, characterized in that: The air supply unit (3) includes a first conveying fan (31), the outlet of the first conveying fan (31) is connected to the main air supply pipe (32), the main air supply pipe (32) is connected to a first compressed air conveying pipe (33), and the end of the first compressed air conveying pipe (33) away from the first conveying fan (31) is connected to the air inlet of the chamber pump (1).

3. The pneumatic ash conveying system according to claim 2, characterized in that: There are three ash hoppers (2). The outlet of one of the ash hoppers (2) is connected to the upper port of the feed pipe of the silo pump (1). An inclined ash guide pipe (7) is fixedly connected to one side of the feed pipe of the silo pump (1). The outlets of the other two ash hoppers (2) are respectively connected to different positions along the length of the ash guide pipe (7).

4. The pneumatic ash conveying system according to claim 3, characterized in that: The highest end of the ash guide pipe (7) is connected to a second compressed air delivery pipe (8), which can deliver compressed air into the ash guide pipe (7).

5. The pneumatic ash conveying system according to claim 4, characterized in that: The air inlet of the second compressed air delivery pipe (8) is connected to the main air supply pipe (32).

6. The pneumatic ash conveying system according to claim 4 or 5, characterized in that: The blow-blocking pipeline (6) includes a plurality of blow-assisted devices (61) spaced apart on the main ash conveying pipe (4). Each blow-assisted device (61) is connected to an air tracing pipe (62). One end of the air tracing pipe (62) is connected to a second conveying fan (63). The second conveying fan (63) is used to provide compressed air to the blow-assisted devices (61).

7. The pneumatic ash conveying system according to claim 6, characterized in that: The blowing device (61) is specifically a pilot-operated automatic plugging valve.

8. The pneumatic ash conveying system according to any one of claims 1 to 5, characterized in that: The main ash conveying pipe (4) is connected to a low-pressure pipe (9) at one end near the ash silo (5). Pneumatic ball valves (10) are provided on the pipe section of the main ash conveying pipe (4) behind the connection point with the low-pressure pipe (9) and on the low-pressure pipe (9).

9. The pneumatic ash conveying system according to claim 8, characterized in that: The end of the low-pressure pipe (9) away from the main ash conveying pipe (4) is connected to the inlet of the power plant dust collector.

10. The pneumatic ash conveying system according to claim 6, characterized in that: Electromagnetic control valves (11) are installed on the main air supply pipe (32), the first compressed air delivery pipe (33), the second compressed air delivery pipe (8), and the accompanying air pipe (62).

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