Ash conveying system and ash conveying method

Abstract

The invention relates to the technical field of material conveying, and discloses an ash conveying system and an ash conveying method.The ash conveying system is characterized in that a plurality of bin pumps are connected; the blockage removing valve is connected with the tail end bin pump; the air conveying main pipeline is connected with the bin pumps through a main air inlet valve, is connected with the bin pumps through fluidizing valves, and is connected with pipelines between the adjacent bin pumps through gulp valves; the main pressure transmitter is arranged on the air conveying main pipeline; the ash conveying system has the initial state that the main air inlet valve, the fluidizing valve and the gulp valve are opened and the blockage removing valve is closed. When the pressure value pk1 is detected, the first state is that the main air inlet valve is closed; when the pressure value pkn is detected, the nth state of the corresponding fluidization valve is closed; when the pressure value pkn + 2 is detected, the air supply valve is closed, and the blockage removing state of the blockage removing valve is opened; and when the pressure value pg is detected, the blocking removal valve is closed in the ending state. The pressure is detected in real time, the valve is automatically opened and closed, ash conveying is adapted, and air consumption and abrasion of the ash conveying pipe are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, and in particular to an ash conveying system and an ash conveying method. Background Art

[0002] In the process of generating electricity in thermal power plants, boilers are generally used. A large amount of ash is generated during the operation of the boiler, which can be reused as industrial materials or building materials. In order to utilize the ash, the ash needs to be collected and transported to the ash bin. Boilers are generally equipped with dust collectors, which are used to collect ash. Thermal power plants generally use a positive pressure dense phase pneumatic conveying system to transport the ash from the ash outlet of the dust collector to the ash bin for storage, and then use vehicles to transport the ash from the ash bin.

[0003] The positive pressure dense phase pneumatic conveying system generally uses one boiler as a unit, and each unit is equipped with 1 to 2 sets of positive pressure dense phase pneumatic conveying systems. The gas volume regulation of the positive pressure dense phase pneumatic conveying system mainly adopts a throttling orifice plate combined with a ball valve. The gas volume of each gas supply point needs to be manually adjusted, which is difficult to adapt to the change of ash volume, often resulting in high gas consumption, easy wear of ash conveying pipes and short life of pipeline parts. Summary of the invention

[0004] In view of this, the present invention provides an ash conveying system to solve the problem that the gas volume regulation of the positive pressure dense phase pneumatic conveying system used for ash conveying in existing thermal power plants mainly adopts a throttling orifice plate combined with a ball valve, and the gas volume of each gas supply point needs to be manually regulated, which is difficult to adapt to the change of ash volume, resulting in large gas consumption, easy wear of the ash conveying pipe and short life of pipeline components.

[0005] In a first aspect, the present invention provides an ash conveying system, comprising:

[0006] A plurality of silo pumps, the outlets of which are sequentially connected along the gas transmission direction, the silo pumps being suitable for receiving ash;

[0007] The drain valve is connected to the output port of the silo pump at the end along the gas transmission direction;

[0008] The air delivery main pipeline, the first output end of which is connected to the output port of the first silo pump along the air delivery direction through the main air inlet valve, the second output end of which is connected to the multiple silo pumps through multiple fluidizing valves; the third output end of which is connected to the pipelines between adjacent silo pumps through multiple air supply valves;

[0009] The main pressure transmitter is installed on the main air delivery pipeline;

[0010] A controller, which is signal-connected to the main air inlet valve, the fluidizing valve, the air supply valve, and the main pressure transmitter;

[0011] Under the control of the controller, the ash conveying system has an initial state in which the main air inlet valve, fluidizing valve and air supply valve are all open and the drain valve is closed; and when the main pressure transmitter detects the pressure value p k1 When the main pressure transmitter detects the pressure value p kn When the pressure value p is detected by the main pressure transmitter, the n-1th fluidizing valve in the gas transmission direction is closed. kn+1 When the pressure value p is detected by the main pressure transmitter, the nth fluidizing valve in the gas transmission direction is closed in the n+1th state; and kn+2 When the main pressure transmitter detects the closing pressure value p g When the drain valve is closed, the initial end state is reached; wherein n is an integer not less than 2, and p g <p k1 <p k2 <... <p kn <p kn+1 <p kn+2 . Beneficial effects: This application adopts the above technical solution to automatically open and close the corresponding valves in real time according to the real-time detected pressure, automatically adapt to the changes in the ash conveying volume, significantly reduce gas consumption, and at the same time reduce the peak gas consumption and the frequency of peak gas consumption, reduce the wear of the ash conveying pipe, thereby extending the service life of pipeline components, automatically operating ash conveying, and reducing manual operations.

[0012] Optionally, it also includes:

[0013] A plurality of ash hoppers are connected to a plurality of silo pumps through feed valves respectively, the ash hoppers are adapted to receive a first set amount of ash, and after the feed valves are opened, the ash enters the corresponding silo pumps;

[0014] The first material level meter is arranged in the ash hopper, and the first material level meter is connected to the controller signal; the controller controls the feeding mechanism to feed ash into the ash hopper; the controller is suitable for controlling the feeding mechanism to stop feeding ash into the ash hopper when the first material level meter detects that the ash in the ash hopper reaches a first set amount. Beneficial effect: The present application adopts the above technical solution, and by setting the first material level meter, the amount of ash in the ash hopper is monitored in real time, so as to prevent the ash conveying system from being turned on when there is no ash in the ash hopper, thereby achieving the effect of saving energy and reducing costs.

[0015] Optionally, it also includes:

[0016] The exhaust valve is connected to the silo pump, and the exhaust valve is suitable for opening when the ash hopper delivers ash to the silo pump. Beneficial effect: The present application adopts the above technical solution, and by setting the exhaust valve, it is beneficial to quickly transport ash from the ash hopper to the silo pump, thereby improving the transportation efficiency.

[0017] Optionally, it also includes:

[0018] The second material level meter is arranged in the silo pump, and the second material level meter is connected to the controller signal; the controller is connected to the feed valve and the exhaust valve by signal; the controller is suitable for controlling the feed valve and the exhaust valve to be closed when the second material level meter detects that the ash in the silo pump reaches the second set amount or the ash is fed into the silo pump for the first set time.

[0019] In a second aspect, the present invention further provides an ash conveying method, using the ash conveying system, comprising:

[0020] Under the control of the controller, open the main air inlet valve, fluidizing valve and air supply valve, and close the drain valve;

[0021] Under the control of the controller, when the main pressure transmitter detects the pressure value p k1 When the main air inlet valve is closed;

[0022] Under the control of the controller, when the main pressure transmitter detects the pressure value p kn When , close the n-1th fluidizing valve along the gas transmission direction;

[0023] Under the control of the controller, when the main pressure transmitter detects the pressure value p kn+1 When , close the nth fluidizing valve along the gas transmission direction;

[0024] Under the control of the controller, when the main pressure transmitter detects the pressure value p kn+2 When the air supply valve is closed and the drain valve is opened to drain the blockage;

[0025] Under the control of the controller, when the main pressure transmitter detects the closing pressure value p g Beneficial effect: This application adopts the above technical solution, automatically opens and closes the corresponding valve in real time according to the real-time detected pressure, automatically adapts to the change of ash conveying volume, significantly reduces gas consumption, and at the same time reduces the peak gas consumption and the frequency of peak gas consumption, reduces the wear of the ash conveying pipe, thereby extending the service life of pipeline components, automatically operates ash conveying, and reduces manual operation.

[0026] Optionally, it also includes:

[0027] Under the control of the controller, when the main pressure transmitter detects the pressure value p gn+2 When the air supply valve is opened, p kn+1 <p gn+2 <p kn+2 Beneficial effects: The present application adopts the above technical solution, and when the conveying pressure is reduced, the air supply valve is opened in real time to ensure reliable conveying of ash and slag.

[0028] Optionally, it also includes:

[0029] Under the control of the controller, when the main pressure transmitter detects the pressure value p gn+1 When the nth fluidizing valve along the gas transmission direction is opened, p kn <p gn+1 <p kn+1 ;

[0030] Under the control of the controller, when the main pressure transmitter detects the pressure value p gn When the n-1th fluidizing valve along the gas transmission direction is opened, p kn-1 <p gn <p kn Beneficial effects: The present application adopts the above technical solution, and when the conveying pressure is reduced, the corresponding fluidizing valve is opened in real time to ensure reliable conveying of ash and slag.

[0031] Optionally, it also includes:

[0032] Under the control of the controller, when the main pressure transmitter detects the pressure value p g1 When the main intake valve is opened, p g1 <p k1 Beneficial effects: The present application adopts the above technical solution, and when the conveying pressure is reduced, the main air intake valve is opened in real time to ensure reliable conveying of ash and slag.

[0033] Optionally, it also includes:

[0034] Under the control of the controller, when the main pressure transmitter detects the closing pressure value p continuously for the second set time, g When the ash is transported to the ash pit, the main air inlet valve, fluidizing valve and air supply valve are closed, and the ash transport is completed. Beneficial effect: The application adopts the above technical solution to accurately judge the end of ash transport and close the corresponding valves in time, saving gas consumption and reducing costs.

[0035] Optionally, it also includes:

[0036] Under the control of the controller, when the pressure value detected by the main pressure transmitter is always less than the closing pressure value p for a continuous third setting time, g When the ash is transported to the ash pit, the main air inlet valve, fluidizing valve and air supply valve are closed, and the ash transport is completed. Beneficial effect: The application adopts the above technical solution to accurately judge the end of ash transport and close the corresponding valves in time, saving gas consumption and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a connection schematic diagram of the ash conveying system provided in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Silo pump; 2. Drain valve; 3. Air delivery main pipeline; 4. Main air inlet valve; 5. Fluidizing valve; 6. Main pressure transmitter; 7. Ash hopper; 8. First material level meter; 9. Feed valve; 10. Exhaust valve; 11. Main air flow meter; 12. Branch pressure transmitter; 13. Branch air flow meter. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] In a thermal power plant, each boiler unit corresponds to several electrostatic precipitator ash hoppers and several economizer ash hoppers. The positive pressure dense phase pneumatic conveying system is equipped with several ash conveying pipelines, which are divided into coarse and fine ash. Through the switching valve on the top of the silo, the dry ash can be transported to the original ash silo, coarse ash silo or fine ash silo. The ash residue from the electrostatic precipitator ash hopper and the economizer ash hopper enters the silo pump and is then sent to the original ash silo through the ash conveying pipeline. At present, during the feeding stage of the silo pump, the positive pressure dense phase pneumatic conveying system generally uses the silo pump level meter to give priority or set a certain feeding time, without considering whether there is ash in the ash hopper. Each positive pressure dense phase pneumatic conveying system operates independently without mutual interlocking. In order to save compressed air, it can only be transported in turn through manual intervention. Due to the lack of overall scheduling, there are often multiple positive pressure dense phase pneumatic conveying systems conveying at the same time, which significantly increases the peak gas consumption and the frequency of peak gas consumption. It is also due to the above reasons that the present application proposes an ash conveying system and an ash conveying method.

[0043] like Figure 1A specific implementation of the ash conveying system shown includes: multiple silo pumps 1, a drain valve 2, an air conveying main pipeline 3, a main pressure transmitter 6, a controller, multiple ash hoppers 7, a first material level meter 8, an exhaust valve 10 and a second material level meter. The ash conveying system described in this application is an intelligent system used in a thermal power plant. Specifically, four silo pumps 1 can be used as a conveying unit.

[0044] The output ports of multiple silo pumps 1 are connected in sequence along the gas transmission direction, and the silo pumps 1 are suitable for receiving ash. The drain valve 2 is connected to the output port of the silo pump 1 at the end of the gas transmission direction. The first output end of the air transmission main pipeline 3 is connected to the output port of the first silo pump 1 along the gas transmission direction through the main air intake valve 4, and the second output end of the air transmission main pipeline 3 is respectively connected to multiple silo pumps 1 through multiple fluidizing valves 5; a parallel branch pressure transmitter 12 and a branch air flow meter 13 can be set on the pipeline before each fluidizing valve 5 in the reverse direction of the gas transmission direction; the branch pressure transmitter 12 can display the pressure value in the pipeline in real time, and the branch air flow meter 13 can display the transmission gas consumption in real time. The third output end of the air transmission main pipeline 3 is respectively connected to the pipeline between adjacent silo pumps 1 through multiple air replenishment valves. The main pressure transmitter 6 is arranged on the air conveying main pipeline 3, and the main pressure transmitter 6 can display the pressure value in the pipeline in real time; further, the main air flow meter 11 can be connected in parallel with the main pressure transmitter 6, and the main air flow meter 11 can display the conveying air consumption in real time. The controller is connected to the main air intake valve 4, the fluidizing valve 5, the air supply valve, and the main pressure transmitter 6 by signals. Under the control of the controller, the ash conveying system has an initial state in which the main air intake valve 4, the fluidizing valve 5, and the air supply valve are all open, and the drain valve 2 is closed; and has an initial state in which the main air intake valve 4, the fluidizing valve 5, and the air supply valve are all open, and the drain valve 2 is closed; and has an initial state in which the main pressure transmitter 6 detects a pressure value p k1 When the main intake valve 4 is closed, the first state; and when the main pressure transmitter 6 detects a pressure value p kn When the n-1th fluidizing valve 5 along the gas transmission direction is closed, the nth state; and when the main pressure transmitter 6 detects the pressure value p kn+1 When the nth fluidizing valve 5 along the gas transmission direction is closed, the n+1th state; and when the main pressure transmitter 6 detects the pressure value p kn+2 When the main pressure transmitter 6 detects the closing pressure value p g When the drain valve 2 is closed, the initial end state is reached; wherein n is an integer not less than 2, and p g <p k1 <p k2 <... <p kn <p kn+1 <p kn+2 Specifically, when four silo pumps 1 form a delivery unit, p k10.1MPa, p k2 0.12MPa, p k3 0.14MPa, p k4 0.16MPa, p k5 0.18MPa, p k6 0.22MPa, p g 0.03MPa; that is, when the main pressure transmitter 6 detects a pressure value of 0.1MPa, the main air inlet valve 4 is closed; when the main pressure transmitter 6 detects a pressure value of 0.12MPa, the first fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects a pressure value of 0.14MPa, the second fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects a pressure value of 0.16MPa, the third fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects a pressure value of 0.18MPa, the fourth fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects a pressure value of 0.22MPa, the air supply valve is closed and the drain valve 2 is opened; in the drain state, the ash is transported to the next transport unit or ash bin. When the main pressure transmitter 6 detects a pressure value of 0.03MPa, the drain valve 2 is closed.

[0045] Multiple ash hoppers 7 are connected to multiple silo pumps 1 through feed valves 9 respectively. The ash hoppers 7 are suitable for receiving a first set amount of ash, and after the feed valves 9 are opened, the ash enters the corresponding silo pump 1. The first material level meter 8 is arranged in the ash hopper 7. Specifically, the first material level meter 8 can be installed 0.5 meters above the flange of the ash hopper 7 to ensure the ash feed amount to the ash hopper 7 each time; the first set amount is an empirical value. The first material level meter 8 is connected to the controller signal; the controller controls the feed mechanism to feed ash into the ash hopper 7; the controller is suitable for controlling the feed mechanism to stop feeding ash into the ash hopper 7 when the first material level meter 8 detects that the ash in the ash hopper 7 reaches the first set amount.

[0046] The exhaust valve 10 is connected to the silo pump 1, and the exhaust valve 10 is suitable for opening when the ash hopper 7 feeds ash into the silo pump 1. The output end of the exhaust valve 10 can be connected to the ash hopper 7 to use exhaust gas to promote the transportation of ash from the ash hopper 7 to the corresponding silo pump 1. The second level meter is arranged in the silo pump 1, and the second level meter is connected to the controller signal; the controller is connected to the feed valve 9 and the exhaust valve 10 by signal; the controller is suitable for controlling the feed valve 9 and the exhaust valve 10 to close when the second level meter detects that the silo pump 1 reaches the second set amount of ash or the silo pump 1 is fed with ash for a first set time. The second level meter can also be connected to the alarm signal, and the alarm sends an alarm signal when the second level meter detects that the silo pump 1 reaches the second set amount of ash. The controller can also formulate control logic, set feeding time and air intake, etc. according to the ash-to-gas ratio parameters calculated by design. The ash-to-gas ratio is the ratio of the ash amount to the air amount.

[0047] The present invention also provides an ash conveying method, which uses the ash conveying system and comprises the following steps:

[0048] S1. Under the control of the controller, open the main air inlet valve 4, the fluidizing valve 5 and the air supply valve, and close the drain valve 2. Specifically, the air supply valve, the fluidizing valve 5 and the main air inlet valve 4 may be opened in sequence; when the four silo pumps 1 are a conveying unit, the air supply valve, the fourth fluidizing valve 5 along the gas transmission direction, the third fluidizing valve 5 along the gas transmission direction, the second fluidizing valve 5 along the gas transmission direction, the first fluidizing valve 5 along the gas transmission direction and the main air inlet valve 4 may be opened in sequence.

[0049] S2. Under the control of the controller, when the main pressure transmitter 6 detects the pressure value p k1 When the main air inlet valve 4 is closed, the main air inlet valve 4 is closed. Further, under the control of the controller, when the main pressure transmitter 6 detects the pressure value p g1 When the main intake valve 4 is opened, p g1 <p k1 .

[0050] S3. Under the control of the controller, when the main pressure transmitter 6 detects the pressure value p kn When the n-1th fluidizing valve 5 along the gas transmission direction is closed, the pressure value p is detected by the main pressure transmitter 6. gn When the n-1th fluidizing valve 5 along the gas transmission direction is opened, p kn-1 <p gn <p kn .

[0051] S4. Under the control of the controller, when the main pressure transmitter 6 detects the pressure value p kn+1When the nth fluidizing valve 5 along the gas transmission direction is closed, the pressure value p is detected by the main pressure transmitter 6. gn+1 When the nth fluidizing valve 5 along the gas transmission direction is opened, p kn <p gn+1 <p kn+1 .

[0052] S5. Under the control of the controller, when the main pressure transmitter 6 detects the pressure value p kn+2 When the main pressure transmitter 6 detects the pressure value p gn+2 When the air supply valve is opened, p kn+1 <p gn+2 <p kn+2 .

[0053] S6, under the control of the controller, when the main pressure transmitter 6 detects the closing pressure value p g When the drain valve 2 is closed.

[0054] S7, under the control of the controller, when the main pressure transmitter 6 continues to detect the closing pressure value p within the second set time, g When the main air inlet valve 4, the fluidizing valve 5 and the air supply valve are closed, the ash conveying is finished. Further, under the control of the controller, when the pressure value detected by the main pressure transmitter 6 is always less than the closing pressure value p for a continuous third set time, g When the main air inlet valve 4, the fluidizing valve 5 and the air supply valve are closed, the ash conveying is finished. The third set time is greater than the second set time.

[0055] Specifically, when four silo pumps 1 form a delivery unit, p k1 0.1MPa, p k2 0.12MPa, p k3 0.14MPa, p k4 0.16MPa, p k5 0.18MPa, p k6 0.22MPa, p g 0.03MPa, p g1 0.09MPa, p g2 0.11MPa, p g3 0.13MPa, p g4 0.15MPa, p g5 0.17MPa, p g5is 0.2MPa; the second set time is 20 seconds, and the third set time is 45 seconds. That is, when the main pressure transmitter 6 detects a pressure value of 0.1MPa, the main air intake valve 4 is closed; when the main pressure transmitter 6 detects that the pressure value drops to 0.09MPa, the main air intake valve 4 is opened again. When the main pressure transmitter 6 detects a pressure value of 0.12MPa, the first fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects that the pressure value drops to 0.11MPa, the first fluidizing valve 5 along the gas transmission direction is opened again. When the main pressure transmitter 6 detects a pressure value of 0.14MPa, the second fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects that the pressure value drops to 0.13MPa, the second fluidizing valve 5 along the gas transmission direction is opened again. When the main pressure transmitter 6 detects a pressure value of 0.16MPa, the third fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects that the pressure value drops to 0.15MPa, the third fluidizing valve 5 along the gas transmission direction is opened again. When the main pressure transmitter 6 detects a pressure value of 0.18MPa, the fourth fluidizing valve 5 along the gas transmission direction is closed; when the main pressure transmitter 6 detects that the pressure value drops to 0.17MPa, the first fluidizing valve 5 along the gas transmission direction is opened again. When the main pressure transmitter 6 detects a pressure value of 0.22MPa, the air supply valve is closed and the drain valve 2 is opened; when the main pressure transmitter 6 detects that the pressure value drops to 0.2MPa, the air supply valve is opened again. When the main pressure transmitter 6 detects a pressure value of 0.03MPa, the drain valve 2 is closed, and then the air supply valve, the fourth fluidizing valve 5 along the gas transmission direction, the third fluidizing valve 5 along the gas transmission direction, the second fluidizing valve 5 along the gas transmission direction, the first fluidizing valve 5 along the gas transmission direction, and the main air intake valve 4 are opened in sequence. During the ash transportation process, when the main pressure transmitter 6 continuously detects 0.03MPa for 20 seconds, the main air intake valve 4, the air supply valve, the first fluidizing valve 5 along the gas transmission direction, the second fluidizing valve 5 along the gas transmission direction, the third fluidizing valve 5 along the gas transmission direction, the fourth fluidizing valve 5 along the gas transmission direction, and the air supply valve are closed in sequence, and the ash transportation is completed. Or in the process of conveying ash, when the main pressure transmitter 6 detects a pressure value less than 0.03MPa for 45 seconds, the main air inlet valve 4, the air supply valve, the first fluidizing valve 5 along the gas transmission direction, the second fluidizing valve 5 along the gas transmission direction, the third fluidizing valve 5 along the gas transmission direction, the fourth fluidizing valve 5 along the gas transmission direction and the air supply valve are closed in sequence, and the ash conveying is completed.

[0056] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An ash conveying system, characterized in that: include: A plurality of silo pumps (1), the output ports of which are connected in sequence along the gas transmission direction, the silo pumps (1) being suitable for receiving ash; The drain valve (2) is connected to the output port of the silo pump (1) at the end along the gas transmission direction; The air delivery main pipeline (3) has a first output end connected to the output port of the first silo pump (1) along the air delivery direction through a main air inlet valve (4); the second output end of the air delivery main pipeline (3) is respectively connected to the plurality of silo pumps (1) through a plurality of fluidizing valves (5); the third output end of the air delivery main pipeline (3) is respectively connected to the pipelines between adjacent silo pumps (1) through a plurality of air supply valves; A main pressure transmitter (6) is arranged on the main air delivery pipeline (3); A controller, which is signal-connected to the main air inlet valve (4), the fluidizing valve (5), the air supply valve, and the main pressure transmitter (6); Under the control of the controller, the ash conveying system has an initial state in which the main air inlet valve (4), the fluidizing valve (5) and the air supply valve are all opened, and the drain valve (2) is closed; and having a function of: when the main pressure transmitter (6) detects a pressure value p k1 When the main pressure transmitter (6) detects the pressure value p kn When the n-1th fluidizing valve (5) along the gas transmission direction is closed, the nth state; and when the main pressure transmitter (6) detects the pressure value p kn+1 When the pressure value p is detected by the main pressure transmitter (6), the nth fluidizing valve (5) along the gas transmission direction is closed in the n+1th state; and kn+2 When the main pressure transmitter (6) detects the closing pressure value p g When the drain valve (2) is closed, the initial end state is reached; wherein n is an integer not less than 2, and p g <p k1 <p k2 <... <p kn <p kn+1 <p kn+2 .

2. The ash conveying system according to claim 1, characterized in that: Also includes: A plurality of ash hoppers (7) are connected to a plurality of silo pumps (1) respectively through feed valves (9), wherein the ash hoppers (7) are adapted to receive a first set amount of ash, and after the feed valves (9) are opened, the ash enters the corresponding silo pumps (1); A first material level meter (8) is arranged in the ash hopper (7), and the first material level meter (8) is connected to the controller by signal; the controller controls the feeding mechanism to feed ash into the ash hopper (7); the controller is suitable for controlling the feeding mechanism to stop feeding ash into the ash hopper (7) when the first material level meter (8) detects that the ash in the ash hopper (7) reaches a first set amount.

3. The ash conveying system according to claim 2, characterized in that: Also includes: The exhaust valve (10) is connected to the silo pump (1), and the exhaust valve (10) is suitable for opening when the ash hopper (7) delivers ash to the silo pump (1).

4. The ash conveying system according to claim 3, characterized in that: Also includes: A second material level meter is arranged in the silo pump (1), and the second material level meter is connected to the controller signal; The controller is signal-connected to the feed valve (9) and the exhaust valve (10); the controller is suitable for controlling the feed valve (9) and the exhaust valve (10) to close when the second material level meter detects that the ash in the silo pump (1) reaches a second set amount or when the ash is fed into the silo pump (1) for a first set time.

5. An ash conveying method, using the ash conveying system according to any one of claims 1 to 4, characterized in that: include: Under the control of the controller, the main air inlet valve (4), the fluidizing valve (5) and the air supply valve are opened, and the drain valve (2) is closed; Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p k1 When the main air inlet valve (4) is closed; Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p kn When the n-1th fluidizing valve (5) along the gas transmission direction is closed; Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p kn+1 When the nth fluidizing valve (5) along the gas transmission direction is closed; Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p kn+2 When the air supply valve is closed and the blockage relief valve (2) is opened, the blockage is relieved; Under the control of the controller, when the main pressure transmitter (6) detects the closing pressure value p g When the drain valve (2) is closed.

6. The ash conveying method according to claim 5, characterized in that: Also includes: Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p gn+2 When the air supply valve is opened, p kn+1 <p gn+2 <p kn+2 .

7. The ash conveying method according to claim 6, characterized in that: Also includes: Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p gn+1 When the nth fluidizing valve (5) along the gas transmission direction is opened, p kn <p gn+1 <p kn+1 ; Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p gn When the n-1th fluidizing valve (5) along the gas transmission direction is opened, p kn-1 <p gn <p kn .

8. The ash conveying method according to claim 7, characterized in that: Also includes: Under the control of the controller, when the main pressure transmitter (6) detects the pressure value p g1 When the main intake valve (4) is opened, p g1 <p k1 .

9. The ash conveying method according to claim 8, characterized in that: Also includes: Under the control of the controller, when the main pressure transmitter (6) continuously detects the closing pressure value p within the second set time, g When the main air inlet valve (4), the fluidizing valve (5) and the air supply valve are closed, the ash conveying is completed.

10. The ash conveying method according to claim 9, characterized in that: Also includes: Under the control of the controller, when the pressure value detected by the main pressure transmitter (6) is always less than the closing pressure value p for a continuous third set time, g When the main air inlet valve (4), the fluidizing valve (5) and the air supply valve are closed, the ash conveying is completed.

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