CN107057769B - Pulverized coal feeding control device and method - Google Patents
Pulverized coal feeding control device and method Download PDFInfo
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- CN107057769B CN107057769B CN201710024006.6A CN201710024006A CN107057769B CN 107057769 B CN107057769 B CN 107057769B CN 201710024006 A CN201710024006 A CN 201710024006A CN 107057769 B CN107057769 B CN 107057769B
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- lock hopper
- hopper
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2200/00—Details of gasification apparatus
- C10J2200/15—Details of feeding means
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/093—Coal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
A powdered coal feeding controller is composed of a main body and a control system consisting of coal hopper, powdered coal lock hopper, powdered coal hopper, central controller, valves and sensors. The central controller is composed of a sequential control unit, an analog quantity and switching quantity input/output unit, a man-machine interaction unit and a field communication unit, wherein a pulverized coal feeding control method is preset in the central controller, a field feedback signal is judged according to the method, a corresponding time sequence action instruction is generated, a valve is controlled to be opened and closed according to a preset program, and the feeding process of pulverized coal is automatically completed. The invention also greatly reduces the safety risk and failure rate in the feeding process by arranging the double pressure relief valve, the valve position feedback device and the valve action timer, and solves the problems of bridging and unsmooth discharging of the pulverized coal under alternating pressure by arranging the lock bucket suction control process and the lock bucket discharging circulation control process in the pulverized coal feeding control method. The invention has high control precision, strong anti-interference capability, high execution efficiency and small error rate, greatly reduces the operation strength, avoids the error caused by manual operation, and realizes automatic, continuous, stable and safe pressurized feeding of pulverized coal.
Description
Technical Field
The invention relates to feeding of solid powder in the field of energy and chemical industry and an automatic control method thereof, in particular to a pulverized coal feeding control device and method.
Background
The pressurized feeding and conveying of pulverized coal are key to the pulverized coal gasification and pyrolysis technology, and are the core for maintaining the stable long-period operation of a process system. At present, pulverized coal pressurized feeding mainly comprises two technical schemes: one is a dry coal powder alternating pressure pneumatic conveying technology; the other is a coal water slurry conveying technology. In the technical field of pulverized coal pressurized feeding in China, an alternating pressure conveying technology has long been dominant.
The alternating pressure conveying technology adopts a lock hopper system to realize the pressurized conveying process of pulverized coal, and due to the special property of the pulverized coal, bridging and hanging materials are often formed in the lock hopper in the pressurized process, so that the blanking is not smooth. In order to solve the above problems, the prior art adopts two schemes: 1. and (5) feeding and discharging the material to a sending tank system. The bottom of the sending tank is provided with a fluidization plate and a stirrer, and the coal conveying pipe is led out from the top of the tank. The scheme can better solve the bridging problem, but has large installation space, complex system and poor stability; 2. and a discharging and sending tank system. Pressurized from the top of the material dispensing tank and the discharge of material falls into the bottom delivery conduit mainly by gravity. The scheme has the advantages of small installation space, simple system, low maintenance cost, incapability of well solving the bridging problem, low production efficiency, high operation strength and unsatisfactory reliability, and is easy to intervene manually.
Disclosure of Invention
The invention aims to solve the problems of bridging, hanging, low conveying precision, unstable conveying, high operation strength and the like in the pulverized coal alternating pressure feeding process in the prior art. The pulverized coal feeding control device and the pulverized coal feeding control method are provided, so that continuous long-period operation and automatic control of a feeding process are realized, the execution efficiency is high, the operation intensity is greatly reduced, errors caused by manual operation are avoided, and automatic, continuous, stable and safe pressurized feeding of pulverized coal is ensured.
In order to achieve the above object, the pulverized coal feeding control device of the present invention comprises a feeding device body and a control system;
the feeding device body comprises a coal bucket, a pulverized coal lock bucket and a pulverized coal feeding hopper which are sequentially connected;
the control system comprises a central controller, and an automatic control valve and a sensor which are connected with the central controller;
the self-control valve comprises a lock hopper feed valve arranged between the coal hopper and the pulverized coal lock hopper, a lock hopper discharge valve arranged between the pulverized coal lock hopper and the pulverized coal feed hopper, a lock hopper pressurizing valve arranged between the air source and the pulverized coal lock hopper, a feed hopper pressure stabilizing valve arranged between the air source and the pulverized coal feed hopper, a pressure relief pipeline with a lock hopper pressure relief valve connected between the coal hopper and the pulverized coal lock hopper, and a balance pipeline with a pressure balance valve connected between the pulverized coal lock hopper and the pulverized coal feed hopper;
the sensor comprises a lock hopper remote transmission pressure gauge and a lock hopper remote transmission level gauge which are arranged on the pulverized coal lock hopper body, a hopper remote transmission pressure gauge and a hopper remote transmission level gauge which are arranged on the pulverized coal hopper body, and a remote transmission pressure difference gauge which is arranged between the lock hopper remote transmission pressure gauge and the hopper remote transmission pressure gauge.
The pressure relief pipeline is provided with a first lock bucket pressure relief valve and a second lock bucket pressure relief valve.
The lock hopper feeding valve, the lock hopper discharging valve, the lock hopper pressurizing valve, the first lock hopper pressure relief valve, the second lock hopper pressure relief valve, the pressure balance valve and the feed hopper pressure stabilizing valve are automatic control valves provided with executing mechanisms, and feedback analog quantity or switching value signals of the automatic control valves are connected to a central controller.
The central controller comprises a sequence control unit, an analog quantity and switching value input/output unit, a man-machine interaction unit and a field communication unit;
the sequential control unit comprises a sequential control table module, a logic diagram module, a three-position switch type SFC module and a timer module, and the four modules construct a feeding control method, a bucket locking suction control process and a bucket locking discharging circulation control process.
The sequence control unit receives feedback signals of the lock hopper remote transmission pressure gauge, the lock hopper remote transmission material level gauge, the feed hopper remote transmission pressure gauge, the feed hopper remote transmission material level gauge and the remote transmission pressure difference gauge through the field communication unit, generates corresponding time sequence action instructions after analysis through a feeding control method built in the sequence control unit, and is converted into switching value signals issued to the automatic control valve through the field communication unit, and the relevant valves are controlled to be opened and closed according to the instructions.
The sequence control meter module comprises a sequence control function block automatic operation module, a sequence control fault SIS module, a sequence control starting action module, a sequence control resetting action module, a sequence control stopping action module and a cycle timer time-to-action module;
the logic diagram module comprises a sequential control pre-starting condition judging module, a sequential control valve interlocking module, a pulverized coal lock hopper pressure low judging module, a pulverized coal lock hopper material level high judging module, a pulverized coal lock hopper material level low judging module, a pulverized coal feed hopper material level low judging module, a differential pressure gauge high judging module and a sequential control picture button action module;
the three-position switch type SFC module comprises a sequential control main program module;
the timer module comprises a circulation timer module, a discharging timer module, a valve action timer module and a delay timer module.
The man-machine interaction unit displays the steps and the states of the sequence control in real time, and the process parameters are issued to the analog quantity and switching value input/output unit through the operator station and issued to the sequence control unit after being converted by the man-machine interaction unit.
The lock hopper remote transmission pressure gauge and the feed hopper remote transmission pressure gauge adopt a diffusion silicon pressure sensor or a diaphragm type pressure gauge.
The lock hopper remote transmission level gauge and the hopper remote transmission level gauge adopt a radio frequency admittance level gauge, a radar level gauge or a tuning fork level gauge.
The pulverized coal feed control method of the invention comprises the following steps:
(1) Initializing condition checking: the lock hopper feeding valve, the lock hopper discharging valve, the lock hopper pressurizing valve, the first lock hopper pressure relief valve, the second lock hopper pressure relief valve and the pressure balance valve are closed;
(2) A valve action timer in the central controller is started, and a circulation timer is started;
(3) The second lock hopper pressure release valve and the first lock hopper pressure release valve are sequentially opened to release pressure for the pulverized coal lock hopper, and when the lock hopper remote transmission pressure gauge reaches a preset alarm value, the central controller sends a signal to open the lock hopper feed valve, and the pulverized coal hopper feeds the pulverized coal lock hopper;
(4) When the lock hopper remote transmission level gauge reaches a preset high alarm value, closing a lock hopper feeding valve, and then sequentially closing a first lock hopper pressure release valve and a second lock hopper pressure release valve;
(5) Opening a lock hopper pressurizing valve to pressurize the pulverized coal lock hopper, and closing the lock hopper pressurizing valve when the remote transmission differential pressure gauge reaches a preset alarm value;
(6) Executing a lock hopper suction control process (25): opening the bucket discharging valve, sequentially opening the second bucket pressure relief valve and the first bucket pressure relief valve, starting the delay timer, and sequentially closing the first bucket pressure relief valve and the second bucket pressure relief valve after the preset time is reached;
(7) Executing a lock hopper unloading cycle control process (26): opening a pressure balance valve, starting a discharging timer after the valve is opened, and judging whether the lock hopper remote transmission level gauge reaches a preset low alarm value or not after the discharging timer reaches a preset value: if the lock hopper remote transmission level gauge reaches a preset low alarm value, starting a delay timer, and after the set time is reached, sequentially closing a lock hopper discharge valve and a pressure balance valve, and then sequentially executing the steps (8) and (9); if the lock hopper remote transmission level gauge does not reach a preset low alarm value, sequentially closing a lock hopper discharge valve and a pressure balance valve, and returning to the step (5);
(8) Judging whether the circulation timer exceeds a preset value, if so, ending the program; if not, resetting the circulation timer;
(9) Judging whether a hopper remote-transmission level gauge reaches a preset alarm value or not: if the remote transmission level gauge of the feeding hopper does not reach a preset alarm value, waiting; if the remote-transmission bin level indicator of the feeding hopper reaches a preset alarm value, returning to the step (1) to start the next feeding cycle.
The invention has the beneficial effects that:
advanced pulverized coal feed control methods. The inventive lock hopper suction control process and the lock hopper discharge circulation control process are arranged in the coal feeding control method, so that the lock hopper discharging efficiency is effectively improved, the automatic, continuous, stable and safe pressurized feeding of pulverized coal is successfully realized, and the problems of bridging and unsmooth discharging of pulverized coal under alternating pressure which have long plagued the coal chemical industry are solved; a reliable control system. The system has the advantages of high time sequence control precision, strong anti-interference capability, high execution efficiency and small error rate, greatly reduces the operation intensity, improves the reliability of the process flow, and realizes automatic, continuous, stable and safe pressurized feeding of pulverized coal.
Further, by arranging the lock hopper double pressure relief valve, the valve position feedback device, the double electromagnetic valve and the valve action timer, the safety risk and system faults caused by valve faults are greatly reduced.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
In the figure: 1. a coal bucket; 2. a pulverized coal lock hopper; 3. a pulverized coal hopper; 4. a lock hopper feed valve; 5. a bucket locking discharge valve; 6. a lock hopper pressurizing valve; 7. the first lock hopper pressure release valve; 8. the second lock hopper pressure release valve; 9. a pressure balancing valve; 10. a hopper pressure stabilizing valve; 11. a lock hopper remote transmission pressure gauge; 12. a hopper remote pressure gauge; 13. a remote pressure differential meter; 14. a lock hopper remote transmission level gauge; 15. a hopper remotely transmits a level gauge; 16. a pressure relief line; 17. balance lines; 18. a gas source; 19. a central controller; 20. a sequence control unit; 21. analog quantity and switching quantity input/output units; 22. a man-machine interaction unit; 23. a field communication unit; 24. a feed control method; 25. a lock bucket suction control process; 26. a bucket locking discharging cycle control process; 27. a sequential control meter module; 28. a logic diagram module; 29. a three-position switch-type SFC module; 30. a timer module.
Fig. 2 is a schematic diagram of the central controller 19 according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to FIG. 1, the pulverized coal feed control apparatus of the present invention includes a feeder body and a control system;
the feeding device body comprises a coal bucket 1, a pulverized coal lock bucket 2 and a pulverized coal feeding hopper 3 which are sequentially connected;
the control system comprises a central controller 19 and an automatic control valve and a sensor which are connected with the central controller 19;
the self-control valve comprises a lock hopper feed valve 4 arranged between a coal hopper 1 and a pulverized coal lock hopper 2, a lock hopper discharge valve 5 arranged between the pulverized coal lock hopper 2 and a pulverized coal feed hopper 3, a lock hopper pressurizing valve 6 arranged between an air source 18 and the pulverized coal lock hopper 2, a feed hopper pressure stabilizing valve 10 arranged between the air source 18 and the pulverized coal feed hopper 3, a pressure release pipeline 16 with a first lock hopper pressure release valve 7 and a second lock hopper pressure release valve 8 connected between the coal hopper 1 and the pulverized coal lock hopper 2, and a balance pipeline 17 with a pressure balance valve 9 connected between the pulverized coal lock hopper 2 and the pulverized coal feed hopper 3;
the sensor comprises a lock hopper remote transmission pressure gauge 11 and a lock hopper remote transmission level gauge 14 which are arranged on the body of the pulverized coal lock hopper 2, a hopper remote transmission pressure gauge 12 and a hopper remote transmission level gauge 15 which are arranged on the body of the pulverized coal hopper 3, and a remote transmission pressure difference gauge 13 which is arranged between the lock hopper remote transmission pressure gauge 11 and the hopper remote transmission pressure gauge 12.
The coal bucket 1 of the invention is normal pressure equipment, stores enough qualified coal dust from the coal pulverizing system, and ensures continuous feeding to the coal powder lock bucket 2 during the operation of the device.
The pulverized coal lock hopper 2 is an alternating pressure device. The upper part is connected with the coal hopper 1 through a lock hopper feed valve 4, and the lower part is connected with the pulverized coal hopper 3 through a lock hopper discharge valve 5. The central controller 19 controls the opening and closing of the first lock hopper pressure release valve 7, the second lock hopper pressure release valve 8, the lock hopper pressure charging valve 6, the lock hopper feeding valve 4 and the lock hopper discharging valve 5 through analyzing analog quantity signals transmitted by the lock hopper remote transmission pressure gauge 11 and the lock hopper remote transmission material level gauge 14 which are arranged on the pulverized coal lock hopper 2, and the technical processes of normal-pressure receiving and pressure discharging of the pulverized coal lock hopper 2 are completed.
The pressure release pipeline 16 of the pulverized coal lock hopper 2 is provided with a first lock hopper pressure release valve 7 and a second lock hopper pressure release valve 8, and when one pressure release valve is blocked and stuck by pulverized coal, the other pressure release valve can be normally closed in a large probability. Meanwhile, the valve position feedback device and the valve action timer are arranged to act with the design in a combined way, so that the safety risk caused by valve faults is greatly reduced.
The pulverized coal hopper 3 is a pressurized device on which a hopper pressure stabilizing valve 10, a hopper remote pressure gauge 12 and a hopper remote level gauge 15 are mounted. Pressure control aspect: the hopper stabilizing valve 10 and the hopper remote pressure gauge 12 form a control loop, and the central controller 19 correspondingly changes the opening of the hopper stabilizing valve 10 by analyzing analog quantity signals fed back by the hopper remote pressure gauge 12, so as to maintain the pressure stability of the pulverized coal hopper 3. Level control aspect: when the discharging timer is up, an interlocking signal is sent to the central controller 19, and the lock hopper discharging valve 5 is closed, so that the material level of the pulverized coal hopper 3 is controlled to meet the process requirements.
The lock hopper feed valve 4 and the lock hopper discharge valve 5 are wear-resistant disc valves, so that the condition that the valve is blocked by pulverized coal can be effectively avoided. The lock hopper remote pressure gauge 11 and the hopper remote pressure gauge 12 adopt indirect pressure taking type pressure gauges, and can effectively prevent pulverized coal from blocking a pressure taking pipeline. The detection technology adopted by the lock hopper remote transmission level gauge 14 and the feed hopper remote transmission level gauge 15 is not easy to hang materials, and the generation of false material level is avoided.
The sequential control unit 20 of the central controller 19 is provided with a lock suction control process 25 and a lock discharge cycle control process 26. The lock hopper suction control process 25 is to open the first lock hopper pressure release valve 7 and the second lock hopper pressure release valve 8, and enhance the fluidity of pulverized coal through the pressure release suction process, so as to promote the pulverized coal lock hopper 2 to discharge smoothly. The lock hopper discharging cycle control process 26 is a process of judging whether the lock hopper remote transmission level gauge 14 reaches a low alarm value after the discharging timing time of the pulverized coal lock hopper 2 is up, or else, re-executing the discharging program of the pulverized coal lock hopper 2. In the alternating pressure coal feeding process, the discharging difficulty caused by the pulverized coal bridging often occurs, and the lock bucket discharging circulation control process 26 is arranged, so that the loosening and discharging processes can be repeated when the pulverized coal lock bucket 2 is not smooth in discharging, the manual operation intensity is greatly reduced, and the error in repeated operation is avoided.
The pulverized coal feed control method of the invention comprises the following steps:
(1) Initializing condition checking:
the lock hopper feed valve 4, the lock hopper discharge valve 5, the lock hopper charging valve 6, the first lock hopper pressure release valve 7, the second lock hopper pressure release valve 8 and the pressure balance valve 9 are all in a closed state;
(2) A valve action timer in the central controller 19 is started, and a circulation timer is started;
(3) The second lock hopper pressure release valve 8 and the first lock hopper pressure release valve 7 are sequentially opened to release pressure for the pulverized coal lock hopper 2. When the lock hopper remote transmission pressure gauge 11 reaches a preset alarm value of 0-1000 KPa, the central controller 19 sends out a signal to open the lock hopper feed valve 4, and the coal hopper 1 feeds the pulverized coal lock hopper (2);
(4) When the lock hopper remote transmission level gauge 14 reaches a preset high alarm value of 0-90%, closing the lock hopper feed valve 4, and then sequentially closing the first lock hopper relief valve 7 and the second lock hopper relief valve 8;
(5) Opening the lock hopper pressurizing valve 6 to pressurize the pulverized coal lock hopper 2, and closing the lock hopper pressurizing valve 6 when the remote transmission differential pressure gauge 13 reaches a preset alarm value of 0-1000 KPa;
(6) The lock hopper suction control process 25 is performed: opening the bucket unloading valve 5, sequentially opening the second bucket relief valve 8 and the first bucket relief valve 7, starting a delay timer, and sequentially closing the first bucket relief valve 7 and the second bucket relief valve 8 after timing to 0-1000 s;
(7) The lock hopper discharge cycle control process 26 is performed: opening the pressure balance valve 9, starting a discharging timer after the valve is opened, and judging whether the lock hopper remote transmission level gauge 14 reaches a preset low alarm value of 0-90% after the discharging timer reaches 0-2000 s: if the lock hopper remote transmission level gauge 14 reaches a preset low alarm value of 0-90%, starting a delay timer, after timing for 0-1000 s, sequentially closing the lock hopper discharge valve 5 and the pressure balance valve 9, and then sequentially executing the steps (8) and (9); if the lock hopper remote transmission level gauge 14 does not reach the preset low alarm value of 0-90%, sequentially closing the lock hopper discharge valve 5 and the pressure balance valve 9, and returning to the step (5);
(8) Judging whether the cycle timer exceeds 10-10000 s. If the time is over, the program is ended; if not, resetting the circulation timer;
(9) Judging whether the hopper remote-transmission level gauge 15 reaches an alarm value of 0-90%: if the feed hopper remote transmission level gauge 15 does not reach the alarm value of 0-90%, waiting; if the remote-transmission bin level gauge 15 of the feeding hopper reaches the alarm value of 0-90%, returning to the step (1) to start the next feeding cycle.
Referring to fig. 2, a central controller 19 of a pulverized coal feed control apparatus is constructed based on a distributed control system, and is composed of a sequential control unit 20, an analog quantity and switching quantity input/output unit 21, a man-machine interaction unit 22, and a site communication unit 23.
The sequence control unit 20 comprises a sequence control table module 27, a logic diagram module 28, a three-position switch type SFC module 29 and a timer module 30, wherein the four groups of modules construct a feeding control method 24, a bucket locking suction control process 25 and a bucket locking discharging circulation control process 26.
The sequence control meter module 27 comprises a sequence control function block automatic operation module, a sequence control fault SIS module, a sequence control starting action module, a sequence control resetting action module, a sequence control stopping action module and a cycle timer time-to-action module; the logic diagram module 28 comprises a sequential control pre-starting condition judging module, a sequential control valve interlocking module, a pulverized coal lock hopper pressure low judging module, a pulverized coal lock hopper material level high judging module, a pulverized coal lock hopper material level low judging module, a pulverized coal feed hopper material level low judging module, a differential pressure gauge high judging module and a sequential control picture button action module; the three-position switch type SFC module 29 comprises a sequential control main program module; the timer module 30 includes a cycle timer module, a discharge timer module, a valve action timer module, and a delay timer module.
The process parameters and instructions sent by the operator station are converted by the analog quantity and switching value input/output unit 21 and then sent to the sequence control unit 20 by the man-machine interaction unit 22; meanwhile, the man-machine interaction unit 22 can display the steps and states of sequential control in real time, so that the purposes of controlling the running state of a program and changing various control parameters in real time by an operator are achieved, errors of manual operation are avoided, and the operation flexibility is improved.
The sequence control unit 20 of the central controller 19 receives feedback signals of the lock hopper remote-transmission pressure gauge 11, the lock hopper remote-transmission material level gauge 14, the feed hopper remote-transmission pressure gauge 12, the feed hopper remote-transmission material level gauge 15 and the remote-transmission pressure difference gauge 13 through the field communication unit 23, generates corresponding time sequence action instructions after analysis through a feeding control method 24 built in the sequence control unit 20, and is converted into switching value signals through the field communication unit 23, and relevant valves are controlled to be opened and closed according to the instructions, so that the pressurized feeding process of pulverized coal is automatically completed.
Claims (8)
1. A pulverized coal feed control apparatus, characterized in that: comprises a feeding device body and a control system;
the feeding device body comprises a coal bucket (1), a pulverized coal lock bucket (2) and a pulverized coal feeding hopper (3) which are connected in sequence;
the control system comprises a central controller (19), and an automatic control valve and a sensor which are connected with the central controller (19);
the automatic control valve comprises a lock hopper feeding valve (4) arranged between the coal hopper (1) and the pulverized coal lock hopper (2), a lock hopper discharging valve (5) arranged between the pulverized coal lock hopper (2) and the pulverized coal feed hopper (3), a lock hopper pressurizing valve (6) arranged between the air source (18) and the pulverized coal lock hopper (2), a feed hopper pressure stabilizing valve (10) arranged between the air source (18) and the pulverized coal feed hopper (3), a pressure release pipeline (16) with the lock hopper pressure release valve is connected between the coal hopper (1) and the pulverized coal lock hopper (2), and a balance pipeline (17) with a pressure balance valve (9) is connected between the pulverized coal lock hopper (2) and the pulverized coal feed hopper (3); the pressure relief pipeline (16) is provided with a first lock hopper pressure relief valve (7) and a second lock hopper pressure relief valve (8), and the first lock hopper pressure relief valve (7) is positioned between the second lock hopper pressure relief valve (8) and the pulverized coal lock hopper (2);
the sensor comprises a lock hopper remote transmission pressure gauge (11) and a lock hopper remote transmission level gauge (14) which are arranged on a pulverized coal lock hopper (2) body, a hopper remote transmission pressure gauge (12) and a hopper remote transmission level gauge (15) which are arranged on a pulverized coal hopper (3) body, and a remote transmission pressure difference gauge (13) which is arranged between the lock hopper remote transmission pressure gauge (11) and the hopper remote transmission pressure gauge (12);
the central controller (19) comprises a sequence control unit (20), an analog quantity and switching value input/output unit (21), a man-machine interaction unit (22) and a field communication unit (23);
the sequential control unit (20) comprises a sequential control table module (27), a logic diagram module (28), a three-position switch SFC module (29) and a timer module (30), and the four groups of modules construct a feeding control method (24), a bucket locking suction control process (25) and a bucket locking discharging circulation control process (26).
2. The pulverized coal feed control apparatus as set forth in claim 1, wherein: the lock hopper feeding valve (4), the lock hopper discharging valve (5), the lock hopper pressurizing valve (6), the first lock hopper pressure release valve (7), the second lock hopper pressure release valve (8), the pressure balance valve (9) and the hopper stabilizing valve (10) are self-control valves provided with executing mechanisms, and analog quantity or switching value signals fed back by the self-control valves are connected into the central controller (19).
3. The pulverized coal feed control apparatus as set forth in claim 1, wherein: the sequence control unit (20) receives feedback signals of the lock hopper remote-transmission pressure gauge (11), the lock hopper remote-transmission material level gauge (14), the feed hopper remote-transmission pressure gauge (12), the feed hopper remote-transmission material level gauge (15) and the remote-transmission pressure difference gauge (13) through the field communication unit (23), generates corresponding time sequence action instructions after analysis through a feeding control method (24) arranged in the sequence control unit (20), and is converted into a switching value signal issued to the self-control valve through the field communication unit (23), and the relevant valve is controlled to be opened and closed according to the instructions.
4. The pulverized coal feed control apparatus as set forth in claim 1, wherein: the sequence control meter module (27) comprises a sequence control function block automatic operation module, a sequence control fault SIS module, a sequence control starting action module, a sequence control resetting action module, a sequence control stopping action module and a cycle timer time-to-action module;
the logic diagram module (28) comprises a sequential control pre-starting condition judging module, a sequential control valve interlocking module, a pulverized coal lock hopper pressure low judging module, a pulverized coal lock hopper material level high judging module, a pulverized coal lock hopper material level low judging module, a pulverized coal feed hopper material level low judging module, a differential pressure gauge high judging module and a sequential control picture button action module;
the three-position switch type SFC module (29) comprises a sequential control main program module;
the timer module (30) includes a cycle timer module, a discharge timer module, a valve action timer module, and a delay timer module.
5. The pulverized coal feed control apparatus as set forth in claim 1, wherein: the human-computer interaction unit (22) displays the steps and the states of sequence control in real time, and the process parameters are issued to the analog quantity and switching value input/output unit (21) through the operator station and issued to the sequence control unit (20) after being converted by the human-computer interaction unit (22).
6. The pulverized coal feed control apparatus as set forth in claim 1, wherein: the lock hopper remote transmission pressure gauge (11) and the feed hopper remote transmission pressure gauge (12) adopt a diffusion silicon pressure sensor or a diaphragm type pressure gauge.
7. The pulverized coal feed control apparatus as set forth in claim 1, wherein: the lock hopper remote transmission level gauge (14) and the feed hopper remote transmission level gauge (15) adopt a radio frequency admittance level gauge, a radar level gauge or a tuning fork level gauge.
8. A method of controlling a pulverized coal feed control apparatus as claimed in claim 1, comprising the steps of:
(1) Initializing condition checking: the lock hopper feeding valve (4), the lock hopper discharging valve (5), the lock hopper pressurizing valve (6), the first lock hopper pressure release valve (7), the second lock hopper pressure release valve (8) and the pressure balance valve (9) are closed;
(2) A valve action timer in the central controller (19) is started, and a circulation timer is started;
(3) The second lock hopper pressure release valve (8) and the first lock hopper pressure release valve (7) are sequentially opened to release pressure for the pulverized coal lock hopper (2), when the lock hopper remote transmission pressure gauge (11) reaches a preset alarm value, the central controller (19) sends a signal to open the lock hopper feed valve (4), and the pulverized coal hopper (1) feeds the pulverized coal lock hopper (2);
(4) When the lock hopper remote transmission level gauge (14) reaches a preset high alarm value, the lock hopper feed valve (4) is closed, and then the first lock hopper pressure release valve (7) and the second lock hopper pressure release valve (8) are sequentially closed;
(5) Opening a lock hopper pressurizing valve (6) to pressurize the pulverized coal lock hopper (2), and closing the lock hopper pressurizing valve (6) when a remote transmission differential pressure gauge (13) reaches a preset alarm value;
(6) Executing a lock hopper suction control process (25): opening the bucket discharging valve (5), sequentially opening the second bucket pressure release valve (8) and the first bucket pressure release valve (7), starting a delay timer, and sequentially closing the first bucket pressure release valve (7) and the second bucket pressure release valve (8) after the preset time is reached;
(7) Executing a lock hopper unloading cycle control process (26): opening a pressure balance valve (9), starting a discharging timer after the valve is opened, and judging whether a lock hopper remote transmission level gauge (14) reaches a preset low alarm value or not after the discharging timer reaches a preset value: if the lock hopper remote transmission level gauge (14) reaches a preset low alarm value, starting a delay timer, and after the set time is reached, sequentially closing the lock hopper discharge valve (5) and the pressure balance valve (9), and then sequentially executing the steps (8) and (9); if the lock hopper remote transmission level gauge (14) does not reach a preset low alarm value, sequentially closing the lock hopper discharge valve (5) and the pressure balance valve (9), and returning to the step (5);
(8) Judging whether the circulation timer exceeds a preset value, if so, ending the program; if not, resetting the circulation timer;
(9) Judging whether a hopper remote transmission level gauge (15) reaches a preset alarm value or not: if the remote transmission bin level gauge (15) of the feeding hopper does not reach a preset alarm value, waiting; if the remote-transmission bin level gauge (15) of the feeding hopper reaches a preset alarm value, returning to the step (1) to start the next feeding cycle.
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| CN109062154B (en) * | 2018-08-02 | 2019-12-31 | 国家能源投资集团有限责任公司 | Sequential control method for feed preprocessor, storage medium and electronic equipment |
| JP7324417B2 (en) * | 2019-08-09 | 2023-08-10 | 三菱マテリアル株式会社 | Continuous ore feeder |
| CN115058263B (en) * | 2022-08-01 | 2024-04-16 | 陕西延长石油（集团）有限责任公司 | Pulverized coal pressurized continuous feeding device and method |
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