CN114063581B - Intelligent adaptive ash conveying control system for coal-fired power plant - Google Patents
Intelligent adaptive ash conveying control system for coal-fired power plant Download PDFInfo
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- CN114063581B CN114063581B CN202111354858.4A CN202111354858A CN114063581B CN 114063581 B CN114063581 B CN 114063581B CN 202111354858 A CN202111354858 A CN 202111354858A CN 114063581 B CN114063581 B CN 114063581B
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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Abstract
The intelligent adaptive ash conveying control system of the coal-fired power plant is characterized in that a system information interaction module is established in a DCS control system and used for controlling an on-site ash conveying unit system of the coal-fired power plant, and the system information interaction module comprises a coal quality data center, a unit information center, an ash conveying information processing module, an ash conveying system operation module and an operation parameter optimization module; the method has the advantages that ash quantity is calculated according to the designed coal quality characteristics, the actual coal quality of combustion and the real-time coal quantity of entering the furnace, and after the method is operated, blanking time and ash conveying period can be automatically adjusted in real time according to the ash quantity, so that the problems that the feeding time and the ash conveying period of an existing control strategy can only be manually set by operators, the system cannot be adjusted in time due to the change of load and coal quality characteristics, and the optimal operation state of real-time optimizing cannot be achieved due to uneven technical level of operators, and the plant air waste is caused, so that the plant electricity utilization rate is increased.
Description
Technical Field
The invention relates to the technical field of coal-fired power plant control, in particular to an intelligent ash conveying control system for a coal-fired power plant.
Background
The power grid provides higher requirements for depth and flexibility peak shaving of the coal motor unit. The coal motor unit has large volume, and the method is a way for survival of the coal motor unit in the process of depth and flexibility peak regulation, and can realize high-efficiency depth energy conservation and emission reduction of the unit. The reliable and stable operation of the ash conveying system of the coal-fired power generator set is one of important links of safe and efficient operation of the thermal power generator set, but the prior ash conveying system has complex process, the control system can be the most complex one of all ash conveying systems, and the prior problems are mainly as follows:
1. for many years, power generation enterprise technicians are dilemma and the concept of a stability principle of system operation exists, so that a system control strategy cannot be innovated and broken through. The ash conveying period and the feeding time of the existing control strategy of the ash conveying system can only be manually set by operators, a series of adjustment problems caused by the change of the characteristics of load and coal quality of the system are manually adjusted by the operators, but the technical level of the operators is uneven, the system is limited in the operation judgment level in the optimal state and is not timely adjusted, so that the system cannot be operated in the optimal state of real-time optimizing, and the plant electricity consumption is increased due to the fact that the air waste of a plant is not achieved.
2. The control strategy only achieves the ash conveying function under the condition that the valve feedback has no fault, does not have the fault breaking and fault cutting functions, has more system valves and high feedback and fault rate, the switch feedback fault of any valve can influence the operation of the whole electric field ash conveying system, the flexibility peak regulation capacity of a unit is influenced, the ash hopper is accumulated and collapses due to long-time ash conveying limitation, the operation safety of the unit is seriously threatened, and the safety, high efficiency and flexibility operation of a thermal power plant cannot be well exerted.
3. In the prior ash conveying system process, the blank pipe pressure of the ash conveying system changes along with different conveying gas pressures and different pipeline cleanliness degrees, the prior control strategy only manually judges or gives a value according to experience, obviously, the pressure judgment of ash conveying completion cannot change along with the change of preconditions, the ash conveying cycle is long, the ash conveying output is limited, and the ash conveying compressed air is wasted.
4. In the existing ash conveying control concept, an ash conveying system does not collect unit parameters for judgment, but because the unit load and the coal quality characteristics change within a certain time, the load and the coal quality characteristics change to cause the change of ash conveying amount, the ash amount change also requires the response and adjustment of the feeding time and the ash conveying period of the ash conveying system, the ash conveying system has no data interaction with the unit, the ash amount change information generated by the unit is completely unknown, and the ash conveying system can only be adjusted by the operator through the filtering and even does not adjust, so that the resource waste is caused.
5. In the existing ash conveying control concept, a monitoring device for ash blocking is not arranged at a feed inlet of an ash conveying system bin pump, the through flow section of the feed inlet of the bin pump is small and is frequently blocked by sundries, so that ash hopper is frequently blocked and cannot be found in time, full ash collapse accidents occur, and safety operation of a unit is seriously threatened.
6. The existing ash conveying control concept is that the system is only responsible for conveying ash to an ash warehouse, and does not need to perform qualitative and quantitative analysis and calculation on the ash conveying condition, so that the relevance of system information is poor, when hidden potential safety hazards exist in the system, technicians are difficult to find, effective remedial measures are difficult to make, or the remedial measures are too late to make, the safety and reliability of the system are poor, and the efficient, economical and flexible operation of a unit is affected.
Based on the existence of the problems, the reliability and the safety of the ash conveying system are greatly reduced, and the flexibility of the unit under the background of depth peak regulation is restricted.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an intelligent ash conveying control system for a coal-fired power plant, which is used for controlling an on-site ash conveying unit by establishing a system information interaction module in a DCS control system.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the intelligent adaptive ash conveying control system of the coal-fired power plant is characterized in that a system information interaction module is established in a DCS control system and used for controlling an on-site ash conveying unit system of the coal-fired power plant, and the system information interaction module comprises a coal quality data center 100, a unit information center 200, an ash conveying information processing module 300, an ash conveying system operation module 400 and an operation parameter optimization module 600;
the coal quality data center 100 is configured to record characteristics of the coal quality 101 designed by the unit and characteristics of the coal quality 102 used for combustion, and send coal quality data information to the ash conveying information processing module 300, the ash conveying information processing module 300 obtains a theoretical calculated ash amount 301 according to the data of the coal quality 102 used for combustion and the data of the unit coal quality 202 in the unit information center 200, and informs the ash conveying system operation module 400 of the theoretical calculated ash amount 301, the ash conveying system operation module 400 activates a pressure calibration 405 instruction in the operation of the ash conveying system according to the accumulated ash amount 303, and the ash conveying system operation module 400 starts a self-check 403, namely, controls a valve in a site ash conveying unit system to ensure that the operation is normal; after the self-checking is finished, the pressure calibration 405 performs system pressure rate calibration, namely, a valve in the on-site ash conveying unit system is controlled to perform air pipe pressure test; the system enters an operation state according to the ash quantity after the air pipe pressure test is finished, the function of the operation parameter optimization module 600 is activated to track and optimize the system after the accumulated ash quantity of the unit reaches a set value, the operation parameter optimization module continuously adjusts blanking time through blanking time optimization 601, observes the change trend of ash conveying pressure 521 in the on-site ash conveying unit system after the adjustment is finished, compares ash conveying periods 602 after each adjustment, and searches for the maximum ash conveying quantity in unit time in a cycle.
The unit information center 200 comprises a unit load 201, a unit coal amount 202, a turbine rotating speed 203, a smoke exhaust temperature 204 and a ash falling temperature 205; the method comprises the steps of collecting and identifying starting information of a unit and judging the starting state of the unit; the data of the unit information center 200 is sent to the ash conveying information processing center 300 so as to realize the dynamic change of the real-time ash quantity of the unit in the on-site ash conveying unit system by the ash conveying control system, and the feeding time and the ash conveying period of the bin pumps A1-A4 in the on-site ash conveying unit system of the coal-fired power plant are timely adjusted, so that the ash quantity change caused by the load or the coal quality change of the unit can be intelligently adapted.
In order to judge whether the ash conveying system has ash blocking of the blanking device in the operation process, the on-site ash conveying unit system of the coal-fired power plant adds a temperature-setting measuring point AT1-AT4 AT the blanking port of each bin pump A1-A4, and transmits a signal to a 406 fault diagnosis module of the ash conveying system operation 400, when the temperature of the blanking port of the bin pump A1-A4 is increased to be higher than the set temperature after the system is operated, the blanking port ash blocking identification is automatically activated, namely, the system selects AT1, AT2, AT3 and AT4 to carry out highest value screening and lowest value screening, and when the deviation between the highest value and the lowest value is higher than the set value, the blanking port judged to be the lowest value has ash blocking, and then a warning is sent to prompt maintenance personnel to further check and process.
The unit information center 200 comprises data of a unit coal quantity 202 and a smoke exhaust temperature 204, a counting function of an ash quantity 304 of an ash bin is activated when the ash conveying system detects that the coal quantity enters a hearth and the rate of rise of the smoke exhaust temperature is continuously greater than a set value, and the ash quantity of the ash bin is calculated in real time by combining with the material level 522 of the ash bin of a site ash conveying unit system of a coal-fired power plant, the system compares the calculated ash quantity 301 generated by the unit with the ash quantity 304 of the ash bin, and when the generated deviation between the calculated ash quantity 301 and the ash quantity 304 of the ash bin is enough to cause the ash bin to store ash, an overrun warning function 305 is activated, so that technicians are informed of timely checking the ash bin in advance, and collapse accidents are prevented from being caused by untimely discovery of full ash of the ash bin.
The invention has the advantages that:
1. the intelligent ash conveying control system for the coal-fired power plant overcomes the dilemma that technicians of coal-fired power generation enterprises are diligent and the technical innovation cannot be broken through due to the novel control concept and the principle of stability of system operation, and the system carries out ash amount calculation according to the designed coal quality characteristics, the actual coal burning characteristics and the real-time coal feeding amount by establishing a control model, so that the technology is beneficial to the early ash amount of the technicians. Meanwhile, after the system operates, the blanking time and the ash conveying period can be automatically adjusted in real time according to the ash amount, so that the problems that the system is required to be adjusted in time due to the change of the characteristics of load and coal quality and the technical level of the operating personnel is uneven, the optimal operation state of real-time optimizing cannot be achieved due to the fact that the system is adjusted, and the air waste of a plant is caused, and the power consumption of the plant is increased are overcome.
2. The invention can realize the self-diagnosis and fault early warning functions of the equipment by the methods of primary parameter calibration, system initial state comparison and the like, and can identify the authenticity of the feedback fault of the system valve. The system overcomes the defects that the prior complex process valve has more feedback and high failure rate, the prior control system has no failure, failure recognition, and the switching feedback failure of any valve can affect the whole row and the operation dilemma of the whole electric field ash conveying system, improves the reliability and the stability of the system, and improves the flexibility peak regulation capability of a unit.
3. The invention executes one empty pipe pressure calibration after each start of system operation or system maintenance operation, reflects the empty pipe pressure of the system to be operated with the most real working condition, and makes the empty pipe pressure not affected by external conditions at the end of ash conveying least, so as to ensure that the empty pipe pressure at the end of normal ash conveying is judged correctly, and the ash conveying time is the shortest, thereby achieving the purposes of high ash conveying efficiency and air conveying saving. The method overcomes the defects that the existing control strategy is limited in ash output and waste ash-conveying compressed air because the blank pipe pressure cannot be changed along with the change of external conditions due to the fact that a value is given empirically, and the like.
4. The invention can realize information interaction with the unit, sense the change of ash conveying amount caused by the change of load and coal quality characteristics of the unit, adjust the feeding time and the ash conveying period of the system in real time so as to ensure that the system achieves real-time optimizing operation, overcome unnecessary resource waste caused by slow response speed of ash amount operators, and improve the efficiency of the unit.
5. According to the intelligent ash conveying control system for the coal-fired power plant, the temperature point is increased at the blanking port of the bin pump, so that the ash flowing condition of the blanking port can be identified in the normal running process of the system, the occurrence of ash filling and collapse accidents of an ash bucket due to the fact that ash blocking cannot be found in time due to the fact that the ash blocking is caused by the monitoring device of the ash conveying system bin pump, and the running safety of equipment is improved.
6. The intelligent adaptive ash conveying control system for the coal-fired power plant can realize the real-time sensing of the balance condition of the ash quantity generated by a unit and the ash discharge quantity of the ash conveying system, the system automatically compares the generated ash quantity of the unit with the total ash inlet quantity of an ash warehouse, and when the generated ash quantity and the ash inlet quantity of the ash warehouse generate larger deviation, the system warns when the generated ash quantity and the ash inlet quantity of the ash warehouse are enough to cause the ash deposit of an ash hopper to have safety risks, and reminds technicians to check the ash hopper in time so as to prevent the occurrence of full ash collapse accidents of the ash hopper.
Drawings
FIG. 1 is a diagram showing the information interaction of each functional block of the control system of the present invention.
FIG. 2 is a schematic diagram of an ash handling unit system in the field.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The intelligent adaptive ash conveying control system of the coal-fired power plant is characterized in that a system information interaction module is established in a DCS control system and used for controlling an on-site ash conveying unit system of the coal-fired power plant, and the intelligent adaptive ash conveying control system comprises a coal quality data center 100, a unit information center 200, an ash conveying information processing module 300, an ash conveying system operation module 400 and an operation parameter optimization module 600; the on-site ash conveying unit system of the coal-fired power plant is shown as a chart 2, the chart is a ash conveying unit, the ash conveying unit comprises one or more ash conveying bin pumps and one or more valves, and a system information interaction module is shown as a chart 1.
The coal quality data center 100 is configured to record characteristics of the coal quality 101 designed by the unit and characteristics of the coal quality 102 used for combustion, and send coal quality data information to the ash conveying information processing module 300, the ash conveying information processing module 300 obtains a theoretical calculated ash quantity 301 according to the data of the coal quality 102 used for combustion and the data of the unit coal quantity 202 in the unit information center 200, and informs the ash conveying system operation module 400 of the theoretical calculated ash quantity 301, the ash conveying system operation module 400 activates a pressure calibration 405 instruction in the ash conveying system operation according to the accumulated ash quantity 303, the ash conveying system operation module 400 starts self-checking 403, that is, controls valves 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519, keep a closed state, and switches 511, 512, 513, 514, 516, 518, 519 ensure normal operation; after the self-checking is finished, the pressure calibration 405 performs system pressure rate calibration, namely, valves 501, 502, 503, 504, 505, 506, 507, 508, 509, 510 in a field ash conveying unit system are controlled to be opened, 511, 512, 513, 514, 515, 516, 517, 518, 519 are opened under the state that the valves are kept closed, 511 is opened, the system is boosted, the system boosting rate is recorded as K5110, when the ash conveying pressure 521 approaches to the system pressure 520, the valve 511 is closed, the recording system keeps the decompression rate as K5111, the valve 513 is opened, the system is decompressed, and the system decompression rate is recorded as K5130; after the recording is completed, the valve is closed 513 to test the air pipe pressure 404, and the valves 501, 504, 506, 508, 510 and 519 are opened first, and then the valves 511, 512 and 518 are opened; recording the blank pipe pressure as K5210 when the pressure change rate of the ash conveying system pressure 521 is 0; the system enters an operation state according to the ash quantity after the air pipe pressure test is finished, the function of the operation parameter optimization module 600 is activated to track and optimize the system when the accumulated ash quantity of the unit reaches 5 tons, the operation parameter optimization module continuously adjusts blanking time through blanking time optimization 601, observes the change trend of ash conveying pressure 521 in the on-site ash conveying unit system after the adjustment is finished, compares ash conveying periods 602 after each adjustment, and searches for the maximum ash conveying quantity in unit time in a cycle. The ash conveying system of the coal-fired unit can be intelligently adapted to the change of the unit load and the self-optimizing operation of the coal quality characteristic change under the condition of no intervention, the system is ensured to be in an optimal state in real time so as to save and convey compressed air to the greatest extent, and the electricity consumption of the air compressor is reduced, so that the station power consumption is reduced.
In order to accurately diagnose the influence and risk of faults on the system operation, the intelligent ash conveying control system of the coal-fired power plant is characterized in that when the system valve feedback has faults, the fault diagnosis 406 function of the ash conveying system operation 400 is activated, the fault point is identified true or false, namely when the valve 511 feedback bad quality or feedback disappearance in the on-site ash conveying unit system is carried out, under the precondition that the system cannot judge the valve physical position switch, the system stops running an ash conveying program, closes the valves 511, 512, 513, 514, 515, 516, 517, 518 and 519, closes the valve 513 after 30S is opened or closes the ash conveying pressure 521 when the descending rate is 0; opening the valve 511 and observing the change condition of the ash conveying pressure 521, if the ash conveying pressure 521 is unchanged, the valve 512 has a fault, and sending out a request maintenance alarm; if the value of the ash delivery pressure 521 is close to the value of the system pressure 520 after the valve 513 is opened, the valves 512, 518 and 519 are opened, when 521 is stable and is compared with the original value K5210 of the initialized empty pipe pressure 521, and when the difference value is within +/-0.03, the system judges that the fault signal of the valve 511 is distorted, and the system executes normal operation; if the comparison with the original value K5210 shows that the difference is within +/-0.03, the system judges that the fault signal is true, and the system sends out a request maintenance alarm.
When the feedback of bad quality or feedback of the valve 512 in the on-site ash conveying unit system is lost, under the precondition that the ash conveying control system cannot judge the physical position switch of the valve, the system stops running an ash conveying program, closes the valves 511, 512, 513, 514, 515, 516, 517, 518 and 519, closes the valves 51330S after opening the valves 51330S or closes the ash conveying pressure 521 when the descending rate is 0; opening the valve 512 and observing the change condition of the ash conveying pressure 521, if the ash conveying pressure 521 is unchanged, judging that the valve 512 has a fault, sending out a request maintenance alarm, opening the valves 512, 518 and 519 when the ash conveying pressure 521 is close to the value of the system pressure 520, comparing the ash conveying pressure 521 with the original value K5210 of the initialized empty pipe pressure 521 after being stable, and when the difference value is smaller than 0.05KPa, judging that the fault signal is true by the system, and sending out the request maintenance alarm; when the difference is greater than 0.05KPa, the system determines that the fault signal is true and the system will perform a normal operation, as compared to the original value K5210 of the blank pipe pressure 521.
When the feedback of bad quality or feedback of the valve 513 in the on-site ash conveying unit system is lost, under the precondition that the ash conveying control system cannot judge the physical position switch of the valve, the system stops running the ash conveying program, closes valves 511, 512, 513, 514, 515, 516, 517, 518 and 519, closes after opening valve 513 for 30S or closes when the descending rate of ash conveying pressure 521 is 0; opening the valve 511 and observing the change condition of the ash conveying pressure 521, if the change rate of the ash conveying pressure 521 is smaller than the value of K5110, closing the valve 511 when the ash conveying pressure is close to the system pressure 520 or the pressure increasing rate is 0, if the pressure releasing speed of the system is larger than the value of the pressure maintaining rate K5111, judging that the valve 513 has a fault, and sending out a request maintenance alarm; if the pressure release speed of the system is equal to or smaller than the value of the pressure release rate K5111, the system judges that the fault signal is distorted, and the system executes normal operation.
When the feedback of bad quality or feedback of the valve 514 in the on-site ash conveying unit system is lost, under the precondition that the ash conveying control system cannot judge the physical position switch of the valve, the system stops running an ash conveying program, closes the valves 511, 512, 513, 514, 515, 516, 517, 518 and 519, closes the valves 51330S after opening the valves 51330S or closes the ash conveying pressure 521 when the descending rate is 0; opening the valve 511 and observing the change condition of the ash conveying pressure 521, if the change rate of the ash conveying pressure 521 is smaller than the value of the pressure maintaining and releasing rate K5110 in the pressurizing process, closing the valve 51 when the ash conveying pressure is close to the system pressure 520 or the pressure increasing rate is 0, if the pressure releasing rate of the system is greater than the value of the pressure maintaining and releasing rate K5111, judging that the valve 514 has a fault, and sending out an overhaul request alarm; if the pressure release speed of the system is equal to or smaller than the value of the pressure release rate K5111, the system judges that the fault signal is distorted, and the system executes normal operation.
When the feedback of bad quality or feedback of the valve 515 in the on-site ash conveying unit system is lost, under the precondition that the ash conveying control system cannot judge the physical position switch of the valve, the system stops running the ash conveying program, and the valves 511, 512, 513, 514, 515, 516, 517, 518 and 519 are closed, and after the valve 30S is opened 513, the valve is closed or the ash conveying pressure 521 is closed when the descending rate is 0. Opening 511 the valve and observing the change condition of the ash conveying pressure 521, if the change rate of the ash conveying pressure 521 is smaller than the value of K5110, closing 511 the valve when the ash conveying pressure is close to the system pressure 520 or the pressure increasing rate is 0, if the pressure releasing speed of the system is larger than the value of the pressure maintaining rate K5111, judging 515 that the valve has a fault, and sending out a request maintenance alarm; if the pressure release speed of the system is equal to or smaller than the value of the pressure release rate K5111, the system judges that the fault signal is distorted, and the system executes normal operation.
When the feedback of bad quality or feedback of the valve 516 in the on-site ash conveying unit system is lost, under the precondition that the ash conveying control system cannot judge the physical position switch of the valve, the system stops running the ash conveying program, the valves 511, 512, 513, 514, 515, 516, 517, 518 and 519 are closed, the valve 30S is opened 513, and then the valve is closed or the ash conveying pressure 521 is closed when the descending rate of the ash conveying pressure 521 is 0. Opening 511 the valve and observing the change condition of the ash conveying pressure 521, if the change rate of the ash conveying pressure 521 is smaller than the value of K5110, closing 511 the valve when the ash conveying pressure is close to the system pressure 520 or the pressure increasing rate is 0, if the pressure releasing speed of the system is larger than the value of the pressure maintaining rate K5111, judging 516 that the valve has a fault, and sending out a request maintenance alarm; if the pressure release speed of the system is equal to or smaller than the value of the pressure release rate K5111, the system judges that the fault signal is distorted, and the system executes normal operation.
When the feedback of bad quality or feedback of the valve 517 in the on-site ash conveying unit system is lost, under the precondition that the ash conveying control system cannot judge the physical position switch of the valve, the system stops running the ash conveying program, the valves 511, 512, 513, 514, 515, 516, 517, 518 and 519 are closed, the valve 30S is opened 513, and then the valve is closed or the ash conveying pressure 521 is closed when the descending rate is 0. Opening 511 the valve and observing the change condition of the ash conveying pressure 521, if the change rate of the ash conveying pressure 521 is smaller than the value of K5110, closing 511 the valve when the ash conveying pressure is close to the system pressure 520 or the pressure increasing rate is 0, if the pressure releasing speed of the system is larger than the value of the pressure maintaining rate K5111, judging 517 that the valve has a fault, and sending out a request maintenance alarm; if the pressure release speed of the system is equal to or smaller than the value of the pressure release rate K5111, the system judges that the fault signal is distorted, and the system executes normal operation.
When the feedback of bad quality or feedback of a valve 518 in a field ash conveying unit system disappears, under the precondition that an ash conveying control system cannot judge that the physical position of the valve is opened and closed, the system stops running an ash conveying program, the valves 513, 514, 515, 516 and 517 are closed, the valves 511, 512, 518 and 519 are opened, the blank pipe pressure of ash conveying pressure 521 is observed, if the ash conveying pressure 521 and the like are smaller than +/-0.03 KPa of blank pipe pressure K5210, the system judges that the actual physical position of the valve 518 is correct, the system judges that a fault signal is distorted, and the system executes normal operation; if the value of the ash delivery pressure 521 is less than 0.04 KPa of the empty pipe pressure K5210, the actual physical position of the valve 518 is determined to be incorrect, the system determines that the fault signal is true, and a request for maintenance alarm is sent.
When the feedback of bad quality or feedback of a valve 519 in a field ash conveying unit system disappears, under the precondition that an ash conveying control system cannot judge that the physical position of the valve is opened or closed, the system stops running an ash conveying program, the valves 513, 514, 515, 516 and 517 are closed, the valves 511, 512, 518 and 519 are opened, the blank pipe pressure of ash conveying pressure 521 is observed, if the ash conveying pressure 521 is equal to or smaller than the blank pipe pressure K5210, the actual physical position of the valve 519 is judged to be correct, the system judges that a fault signal is distorted, and the system executes normal operation; if the ash delivery pressure 521 is greater than the air pipe pressure K5210, judging that the actual physical position of the valve 519 is wrong, judging that the fault signal is true by the system, and sending out a request maintenance alarm; the system can accurately diagnose and identify the authenticity of the fault under the condition of any valve fault through the judgment, so that the system is ensured not to be stopped due to the feedback distortion of the valve, the running reliability and stability of the system are ensured, and the availability ratio of the system is improved.
The unit information center 200 comprises a unit load 201, a unit coal amount 202, a turbine rotating speed 203, a smoke exhaust temperature 204 and a ash falling temperature 205; the method comprises the steps of collecting and identifying starting information of a unit and judging the starting state of the unit; the data of the unit information center 200 is sent to the ash conveying information processing center 300 so as to realize that an ash conveying system perceives the dynamic change of the real-time ash quantity of the unit, and the feeding time and the ash conveying period of bin pumps A1-A4 in a site ash conveying unit system of a coal-fired power plant are timely adjusted, so that the ash quantity change caused by the load or the coal quality change of the unit can be intelligently adapted.
In order to judge whether the ash conveying system is blocked by a blanking device in the operation process, the on-site ash conveying unit system of the coal-fired power plant is provided with temperature measuring points AT1-AT4 AT blanking ports of each bin pump A1-A4, and transmits signals to a 406 fault diagnosis module of the ash conveying system operation 400, when the temperature of the blanking ports of the bin pumps A1-A4 is increased by more than 15 degrees after the system is operated, the blanking ports are automatically activated to be identified by blocking ash, namely, the system selects AT1, AT2, AT3 and AT4 to carry out highest value screening and lowest value screening, when the deviation between the highest value and the lowest value is more than 15 degrees, the blanking port judged to be the lowest value is blocked, a warning is sent to prompt an overhaul personnel to further check and process, so that the bin pump blanking port with the smallest flow area is prevented from blocking sundries and lacking effective monitoring means, the occurrence of full ash collapse accident of an ash bucket is caused by frequent ash blocking failure to be found in time, and the safe operation of a unit is improved.
The unit information center 200 comprises data of a unit coal quantity 202 and a smoke exhaust temperature 204, an ash conveying system detects that the coal quantity enters a hearth, the rate of rise of the smoke exhaust temperature is continuously greater than 0.1, and the counting function of an ash quantity 304 of an ash bin is activated for 5 minutes, and the ash quantity of the ash bin is calculated in real time by combining the material level 522 of the ash bin of a site ash conveying unit system of a coal-fired power plant, the system compares the calculated ash quantity 301 generated according to the unit with the ash quantity 304 of the ash bin, when the generated calculated ash quantity 301 and the ash quantity 304 of the ash bin deviate enough to cause the ash bin to store ash, an overrun warning function 305 is activated, and technicians are informed of timely checking the ash bin in advance, so that collapse accidents are prevented from being caused by untimely discovery of full ash of the ash bin.
According to the invention, the coal quality characteristics are obtained through a man-machine exchange mode, the generated ash amount is analyzed and calculated in real time, the feeding time, the ash feeding period and the empty pipe end ash conveying pressure of the ash conveying system bin pump are automatically adjusted according to the calculated ash amount, and the influence of the ash conveying system on the operating personnel and the influence of the technical level deviation of the operating personnel on the operating efficiency of the system when the unit load and the coal quality characteristics change in the conventional control strategy are overcome. The ash conveying system of the coal-fired unit can be intelligently adapted to the change of the unit load and the change of the coal quality characteristic under the condition of no intervention, and can automatically find the optimal operation, so that the system is ensured to be in an optimal state in real time, compressed air is saved to the greatest extent, and the electricity consumption of the air compressor is reduced, thereby reducing the station power consumption.
In order to overcome the influence of valve feedback faults on a program, a new ash conveying system control strategy adopts fault identification and diagnosis modes, namely when valve fault feedback bad quality or feedback disappearance exists, under the condition that a system cannot judge a valve physical position switch, the system stops running an ash conveying program to perform system fault identification, namely stopping an ash conveying system, performing system punching, empty pipe pressure checking, single fault channel ash conveying and other checking, confirming the switching state of fault points or fault equipment, ensuring that the system normally starts the system again to recover ash conveying under the condition of feedback faults, ensuring the stability and reliability of the system, and stopping the whole ash conveying system to wait for processing instead of feedback bad quality or once signals disappear; if the checking result shows that the gas leakage of the system affects the operation safety of the ash conveying system, an overhaul alarm is sent out or operators are informed to perform manual isolation, so that the operation reliability of the system is improved.
In order to correctly identify the empty pipe pressure under different ash conveying system pressure conditions, when the ash conveying system is started after first delivery and each maintenance, the system automatically performs one-time empty pipe pressure measurement under the current ash conveying pressure, compares and judges that the empty pipe pressure of the ash conveying system is within +/-0.03 of a normal value, and ensures that the ash conveying pipeline is in an unblocked state. The end time of the ash conveying system after normal ash conveying is convenient to determine;
in order to accurately evaluate the running state of the unit, the ash quantity generated by the unit in real time is accurately calculated, the ash conveying system acquires data such as the load of the unit, the coal quantity, the rotating speed of the gas turbine, the exhaust gas temperature and the like in real time, and the data are used for feedback of the ash conveying system for sensing the generation of the ash quantity after logic judgment, so that the feeding time and the ash conveying period of the bin pump are timely adjusted, and the ash quantity change caused by the load or the coal quality change of the unit can be intelligently adapted.
The temperature measuring point is added at the inlet of the bin pump of the ash conveying system, after the ash conveying system is put into operation, the amount of ash at the inlet of the bin pump of the ash conveying system is indirectly perceived according to the temperature of the ash, whether the feeding of the bin pump is normal or not is judged according to the temperature, and potential safety hazards caused by ash blocking at the feeding hole of the bin pump can be effectively identified. Preventing the occurrence of ash-filling collapse accidents of the ash bucket caused by the failure of timely finding out ash blocking. The flexible, safe and reliable operation of the unit is effectively ensured.
In order to enable the ash conveying system to sense the balance condition of the generated ash amount and the discharged ash amount of the unit in real time, the system automatically compares the generated ash amount of the unit with the total ash inlet amount of the ash warehouse, and when the generated ash amount and the ash inlet amount of the ash warehouse generate larger deviation, the warning is sent when the generated ash amount and the ash inlet amount are enough to cause the ash deposit of the ash hopper to have safety risks, the technician is reminded to check the ash hopper in time so as to prevent the occurrence of the full ash collapse accident of the ash hopper.
Claims (4)
1. The intelligent adaptive ash conveying control system for the coal-fired power plant is characterized in that a system information interaction module is established in a DCS control system and used for controlling an on-site ash conveying unit system of the coal-fired power plant, and the system information interaction module comprises a coal quality data center (100), a unit information center (200), an ash conveying information processing module (300), an ash conveying system operation module (400) and an operation parameter optimization module (600);
the coal quality data center (100) is used for recording the characteristics of the coal quality (101) of the set design and the characteristics of the coal quality (102) for combustion, sending coal quality data information to the ash conveying information processing module (300), obtaining theoretical calculated ash quantity (301) by the ash conveying information processing module (300) according to the data of the coal quality (102) for combustion and the data of the set coal quantity (202) in the set information center (200), informing the ash conveying system operation module (400) of the theoretical calculated ash quantity (301), enabling the ash conveying system operation module (400) to activate a pressure calibration (405) instruction in the operation of the ash conveying system according to the accumulated ash quantity (303), and starting self-checking (403) by the ash conveying system operation module (400), namely controlling a valve in a site ash conveying unit system to ensure the normal operation of the valve; performing system pressure rate calibration after the self-checking is finished (405), namely controlling a valve in a site ash conveying unit system to perform an empty pipe pressure test; the system enters an operation state according to the ash quantity after the air pipe pressure test is finished, the operation parameter optimization module (600) is activated to track and optimize the system after the accumulated ash quantity of the unit reaches a set value, the operation parameter optimization module continuously adjusts blanking time through blanking time optimization (601), and observes the change trend of ash conveying pressure (521) in the on-site ash conveying unit system after the adjustment is finished, compares ash conveying periods (602) after each adjustment, and searches for the maximum ash conveying quantity in unit time in a cycle.
2. The intelligent ash conveying control system for the coal-fired power plant according to claim 1, wherein the unit information center (200) comprises a unit load (201), a unit coal amount (202), a turbine rotating speed (203), a smoke discharging temperature (204) and an ash falling temperature (205); the method comprises the steps of collecting and identifying starting information of a unit and judging the starting state of the unit; the data of the unit information center (200) is sent to the ash conveying information processing module (300) so as to realize the dynamic change of the real-time ash quantity of the unit in the on-site ash conveying unit system by the ash conveying control system, and the feeding time and the ash conveying period of the bin pumps A1-A4 in the on-site ash conveying unit system of the coal-fired power plant are timely adjusted, so that the ash quantity change caused by the load or the coal quality change of the unit can be intelligently adapted.
3. The intelligent ash conveying control system for the coal-fired power plant according to claim 1, wherein in order to judge whether the ash conveying system is blocked by a blanking device in the operation process, a temperature measuring point AT1-AT4 is additionally arranged AT a blanking port of each bin pump A1-A4 of the coal-fired power plant on-site ash conveying unit system, a signal is transmitted to a fault diagnosis (406) module of an ash conveying system operation module (400), when the temperature of the blanking port of each bin pump A1-A4 is increased to be larger than a set value after the system is operated, the ash blocking recognition of the blanking port is automatically activated, namely, the system selects AT1, AT2, AT3 and AT4 to carry out highest value screening and lowest value screening, and when the deviation between the highest value and the lowest value is larger than the set value, the blanking port judged to be the lowest value is blocked, and a warning is sent to prompt an maintainer to further check and process.
4. The intelligent ash conveying control system for the coal-fired power plant according to claim 1, wherein the unit information center (200) comprises data of unit coal quantity (202) and smoke discharge temperature (204), the ash conveying system detects that the coal quantity enters a hearth and smoke discharge temperature rising rate is continuously greater than a set value, a counting function of ash quantity (304) of an ash bin is activated in a time delay mode, the ash quantity of the ash bin is calculated in real time by combining with a material level (522) of an ash bin of an on-site ash conveying unit system of the coal-fired power plant, the system compares the calculated ash quantity (301) generated by the unit with the ash quantity (304) of the ash bin, when deviation between the generated calculated ash quantity (301) and the ash quantity (304) of the ash bin is enough to cause safety risk of ash bin storage, an overrun warning (305) function is activated, technicians are informed to check the ash bin in time, and collapse accidents are prevented from being caused by untimely discovery.
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