CN103941606A - Thermal power plant weighing coal feeder control logic - Google Patents
Thermal power plant weighing coal feeder control logic Download PDFInfo
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- CN103941606A CN103941606A CN201410155008.5A CN201410155008A CN103941606A CN 103941606 A CN103941606 A CN 103941606A CN 201410155008 A CN201410155008 A CN 201410155008A CN 103941606 A CN103941606 A CN 103941606A
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Abstract
The invention provides thermal power plant weighing coal feeder control logic. An operating personnel given coal quantity instruction module, a DCS logical operation module, an integrating instrument, a frequency converter and a motor are connected in sequence, the motor is further connected with a weighing sensor and a rotating speed sensor, and the signal output end of the weighing sensor and the signal output end of the rotating speed sensor are connected to the integrating instrument. The thermal power plant weighing coal feeder control logic is characterized in that the signal output end of the DCS logical operation module is connected to the frequency converter. DCS output signals are directly output to the frequency converter, DCS logic is redesigned, a PID controller is added, therefore operating personnel can input instructions by hand to control a coal feeder to operate, the influence of integrating instrument faults on drastic fluctuation of coal quantity is eliminated, load down operation and oiling operation of a unit are avoided, safe and stable operation of the unit is guaranteed, and oil consumption is reduced.
Description
Technical field
The present invention relates to a kind of Weighing type coal feeder in heat power plant steering logic.
Background technology
At present, existing weighing coal feeder belt conveyer scale control principle is: as shown in Figure 1, the feeder adhesive tape running speed signal that the coal amount signal that LOAD CELLS is collected and speed probe collect draws instantaneous flow rate signal by integral algorithm, by DCS(scattered control system) to coal output steering order, feeder is controlled on the spot integrating instrument and is received after DCS instruction by contrasting with instantaneous coal amount, after calculating, send instructions to frequency converter, again by Frequency Converter Control feeder rotating speed, thereby reach the object of controlling coal amount.For this reason, DCS not design directly sends instruction to frequency converter, as shown in Figure 1, especially do not have PID controller to connect wherein so that signal variable numerical value is maintained, but maintain signal variable numerical value by front height limiter (301), function generator (302), front adder block (303), analog quantity handoff block (304), manual parameters (305), rear adder block (306), M/A station (307), rate of change limit device one (308), rate of change limit device two (309), rear height limiter (310) realization, there is significant limitation.
And integrating instrument, LOAD CELLS and speed probe are easy to break down, now because DCS cannot directly send instruction to frequency converter, and because DCS is in the shortage of controlling function aspects, the manual control of operations staff also must realize through integrating instrument, therefore often causing can only be at once out of service by equipment set by force, cannot effectively by operations staff, manually control the operation of shutting down before maintenance, to equipment, be that injury is very big, specifically, if operations staff does not find when fault occurs, integrating instrument continues error running, more likely normal production is caused to very big infringement, the safe and stable operation of unit lacks guarantee.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of Weighing type coal feeder in heat power plant steering logic, this Weighing type coal feeder in heat power plant steering logic is by directly exporting DCS output signal to the structure of frequency converter, and redesign DCS logic, add PID controller, thereby make operations staff can manually input instruction and control feeder operation, avoided the impact of the coal amount fluctuation brought because of integrating instrument fault, avoid the operation of unit load down and throw oil operation, guaranteeing that unit safety stable operation has reduced oil consumption.
The present invention is achieved by the following technical programs.
A kind of Weighing type coal feeder in heat power plant steering logic provided by the invention, the given coal amount of operations staff instruction module, DCS logical operation module, integrating instrument, frequency converter, motor connect successively, motor is also connected with LOAD CELLS and speed probe, LOAD CELLS and signals of rotational speed sensor output terminal are connected in integrating instrument, it is characterized in that: described DCS logical operation module signal output part is connected in frequency converter.
Described integrating instrument is controlled integrating instrument for MW96C type on the spot.
Described motor is adhesive tape motor.
Coal-supplying amount instruction, coal feeder rotating speed control system instruction, the feeder of the given coal amount of described DCS logical operation module input end access operations staff instruction module output stopped transport, feeder operation; After coal-supplying amount instruction access, input to respectively adder block and M/A station; After coal feeder rotating speed control system instruction access, input to analog quantity handoff block; Feeder inputs to time function piece one after stopping transport and accessing; After feeder operation access, input to time function piece two.
Large, the instantaneous coal amount feedback of instantaneous coal amount feedback, coal-supplying amount instruction and feedback deviation of described DCS logical operation module input end access integrating instrument output is forbidden, instantaneous bad signal of coal amount feedback signal; After the access of instantaneous coal amount feedback, input to respectively adder block and M/A station; After the bad access of coal-supplying amount instruction and feedback deviation inaccurate, the instantaneous coal amount feedback signal of large, instantaneous coal amount feedback, all input to or door piece.
In the input of described DCS logical operation module, also include coefficient is manually set, coefficient is manually set and inputs to analog quantity handoff block.
Described adder block output terminal is connected to PID piece input end; Described analog quantity handoff block output terminal is connected to respectively the input end at PID piece and M/A station; The output terminal of described time function piece one and time function piece two is all connected to the input end at M/A station; Described time function piece one output terminal is also connected to or door piece input end; Output terminal described or door piece is connected to the input end at M/A station; The output terminal at described M/A station is connected to the input end of PID piece; The output terminal at M/A station is also exported feeder rotary speed instruction.
Described adder block output terminal is connected to the PV end of PID piece; Described analog quantity handoff block output terminal is connected to respectively the N/A end of PID piece and the TR end at M/A station; The output terminal SP end at described M/A station and A end are connected to respectively input end TR end and the TP end of PID piece.
The output terminal of described time function piece one and time function piece two is connected to respectively TS end and the AX end at M/A station; Output terminal described or door piece is connected to the MI end at M/A station; The output terminal O end output feeder rotary speed instruction at M/A station.
Described port standard adopts the DCS system standard of ABB AB.
Beneficial effect of the present invention is: by DCS output signal directly being exported to the structure of frequency converter, and redesign DCS logic, add PID controller, thereby make operations staff can manually input instruction and control feeder operation, avoided the impact of the coal amount fluctuation brought because of integrating instrument fault, avoid the operation of unit load down and throw oil operation, guaranteeing that unit safety stable operation has reduced oil consumption.
Accompanying drawing explanation
Fig. 1 is the logic connection layout of prior art;
Fig. 2 is the logic connection layout of DCS logical operation in prior art;
Fig. 3 is logic connection layout of the present invention;
Fig. 4 is the logic connection layout of DCS logical operation in the present invention;
In figure: the instruction of 101-coal-supplying amount, the instantaneous coal amount feedback of 102-, the instruction of 103-coal feeder rotating speed control system, 104-feeder is stopped transport, the operation of 105-feeder, the instruction of 106-coal-supplying amount and feedback deviation are large, the instantaneous coal amount feedback of 107-is inaccurate, the instantaneous coal amount of 108-feedback signal is bad, 109-feeder rotary speed instruction, the instruction of 110-boiler supplied materials, 111-coal feeder rotating speed control system is manual, 201-manually arranges coefficient, 202-adder block, 203-analog quantity handoff block, 204-time function piece one, 205-time function piece two, 206-PID piece, 207-M/A station, height limiter before 301-, 302-function generator, adder block before 303-, 304-analog quantity handoff block, the manual parameters of 305-, adder block after 306-, 307-M/A station, 308-rate of change limit device one, 309-rate of change limit device two, height limiter after 310-.
Embodiment
Further describe technical scheme of the present invention below, but described in claimed scope is not limited to.
A kind of Weighing type coal feeder in heat power plant steering logic as shown in Figure 3, the given coal amount of operations staff instruction module, DCS logical operation module, integrating instrument, frequency converter, motor connect successively, motor is also connected with LOAD CELLS and speed probe, LOAD CELLS and signals of rotational speed sensor output terminal are connected in integrating instrument, it is characterized in that: described DCS logical operation module signal output part is connected in frequency converter.
Described integrating instrument is controlled integrating instrument for MW96C type on the spot.
Described motor is adhesive tape motor.
As shown in Figure 2, coal-supplying amount instruction 101, coal feeder rotating speed control system instruction 103, feeder stoppage in transit 104, the feeder operation 105 of the output of the given coal amount of described DCS logical operation module input end access operations staff instruction module; After coal-supplying amount instruction 101 accesses, input to respectively adder block 202 and M/A station 207; After coal feeder rotating speed control system instruction 103 accesses, input to analog quantity handoff block 203; After feeder stoppage in transit 104 accesses, input to time function piece 1; After feeder operation 105 accesses, input to time function piece 2 205.
The instantaneous coal amount feedback 102 of described DCS logical operation module input end access integrating instrument output, coal-supplying amount instruction and feedback deviation are large 106, instantaneous coal amount feedback is inaccurate 107, bad 108 signals of instantaneous coal amount feedback signal; After instantaneous coal amount feedback 102 accesses, input to respectively adder block 202 and M/A station 207; Coal-supplying amount instruction and feedback deviation are large 106, instantaneous coal amount feedback is inaccurate 107, all input to or door piece after bad 108 accesses of instantaneous coal amount feedback signal.
In the input of described DCS logical operation module, also include coefficient 201 is manually set, coefficient 201 is manually set and inputs to analog quantity handoff block 203.
Described adder block 202 output terminals are connected to PID piece 206 input ends; Described analog quantity handoff block 203 output terminals are connected to respectively the input end at PID piece 206 and M/A station 207; The output terminal of described time function piece 1 and time function piece 2 205 is all connected to the input end at M/A station 207; Described time function piece one 204 output terminals are also connected to or door piece input end; Output terminal described or door piece is connected to the input end at M/A station 207; The output terminal at described M/A station 207 is connected to the input end of PID piece 206; The output terminal at M/A station 207 is also exported feeder rotary speed instruction 109.
Described adder block 202 output terminals are connected to the PV end of PID piece 206; Described analog quantity handoff block 203 output terminals are connected to respectively the N/A end of PID piece 206 and the TR end at M/A station 207; The output terminal SP end at described M/A station 207 and A end are connected to respectively input end TR end and the TP end of PID piece 206.
The output terminal of described time function piece 1 and time function piece 2 205 is connected to respectively TS end and the AX end at M/A station 207; Output terminal described or door piece is connected to the MI end at M/A station 207; The output terminal O end output feeder rotary speed instruction 109 at M/A station 207.
Described port standard adopts the DCS system standard of ABB AB.
Thus, the logic of calculating coal amount in original integrating instrument on the spot is well incorporated in DCS logical operation module, by the direct output speed instruction of DCS logical operation module, to frequency converter, directly controls the rotating speed of adhesive tape motor.After control strategy optimization, after coal-supplying amount instruction and instantaneous coal amount, send into PID piece 206 in DCS logical operation module, PID piece 206 exports M/A station 207 to, then by M/A station 207, sends feeder rotary speed instruction 109 and control feeder frequency converter rotating speed.When feeder moves, send out pulse signal to M/A station 207 and cut automatic operation, can allow operations staff directly only operate the instruction of given coal amount.When instantaneous coal amount is fed back inaccurate or fault, manual operation is cut at M/A station 207, and now, operations staff can manually input instruction and control.
Obviously, in DCS logical operation module, also can omit the signal input of the instruction 110 of boiler supplied materials and coal feeder rotating speed control system manual 111.
Meanwhile, the distorted signals that feeder rotary speed instruction 109 has also avoided rate of change limit device 2 309, rear height limiter 310 to bring to a great extent is directly sent at M/A station 207.
Claims (10)
1. a Weighing type coal feeder in heat power plant steering logic, the given coal amount of operations staff instruction module, DCS logical operation module, integrating instrument, frequency converter, motor connect successively, motor is also connected with LOAD CELLS and speed probe, LOAD CELLS and signals of rotational speed sensor output terminal are connected in integrating instrument, it is characterized in that: described DCS logical operation module signal output part is connected in frequency converter.
2. Weighing type coal feeder in heat power plant steering logic as claimed in claim 1, is characterized in that: described integrating instrument is controlled integrating instrument for MW96C type on the spot.
3. Weighing type coal feeder in heat power plant steering logic as claimed in claim 1, is characterized in that: described motor is adhesive tape motor.
4. Weighing type coal feeder in heat power plant steering logic as claimed in claim 1, is characterized in that: coal-supplying amount instruction (101), coal feeder rotating speed control system instruction (103), the feeder of the given coal amount of described DCS logical operation module input end access operations staff instruction module output stopped transport (104), feeder operation (105); After coal-supplying amount instruction (101) access, input to respectively adder block (202) and M/A station (207); After coal feeder rotating speed control system instruction (103) access, input to analog quantity handoff block (203); Feeder is stopped transport after (104) are accessed and is inputed to time function piece one (204); After feeder operation (105) access, input to time function piece two (205).
5. Weighing type coal feeder in heat power plant steering logic as claimed in claim 1, is characterized in that: instantaneous coal amount feedback (102), coal-supplying amount instruction and the feedback deviation large (106) of described DCS logical operation module input end access integrating instrument output, instantaneous coal amount feedback inaccurate (107), instantaneous coal amount feedback signal bad (108) signal; After instantaneous coal amount feedback (102) access, input to respectively adder block (202) and M/A station (207); After coal-supplying amount instruction and feedback deviation large (106), instantaneous coal amount feedback inaccurate (107), instantaneous coal amount feedback signal bad (108) access, all input to or door piece.
6. the Weighing type coal feeder in heat power plant steering logic as described in claim 4 or 5, it is characterized in that: in the input of described DCS logical operation module, also include coefficient (201) is manually set, coefficient (201) is manually set and inputs to analog quantity handoff block (203).
7. the Weighing type coal feeder in heat power plant steering logic as described in claim 4,5 or 6, is characterized in that: described adder block (202) output terminal is connected to PID piece (206) input end; Described analog quantity handoff block (203) output terminal is connected to respectively the input end at PID piece (206) and M/A station (207); The output terminal of described time function piece one (204) and time function piece two (205) is all connected to the input end at M/A station (207); Described time function piece one (204) output terminal is also connected to or door piece input end; Output terminal described or door piece is connected to the input end at M/A station (207); The output terminal at described M/A station (207) is connected to the input end of PID piece (206); The output terminal at M/A station (207) is also exported feeder rotary speed instruction (109).
8. Weighing type coal feeder in heat power plant steering logic as claimed in claim 7, is characterized in that: described adder block (202) output terminal is connected to the PV end of PID piece (206); Described analog quantity handoff block (203) output terminal is connected to respectively the N/A end of PID piece (206) and the TR end at M/A station (207); The output terminal SP end at described M/A station (207) and A end are connected to respectively input end TR end and the TP end of PID piece (206).
9. Weighing type coal feeder in heat power plant steering logic as claimed in claim 7, is characterized in that: the output terminal of described time function piece one (204) and time function piece two (205) is connected to respectively TS end and the AX end at M/A station (207); Output terminal described or door piece is connected to the MI end at M/A station (207); The output terminal O end output feeder rotary speed instruction (109) at M/A station (207).
10. Weighing type coal feeder in heat power plant steering logic as claimed in claim 8 or 9, is characterized in that: described port standard adopts the DCS system standard of ABB AB.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410155008.5A CN103941606B (en) | 2014-04-17 | 2014-04-17 | Thermal power plant weighing coal feeder control logic |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410155008.5A CN103941606B (en) | 2014-04-17 | 2014-04-17 | Thermal power plant weighing coal feeder control logic |
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| CN103941606A true CN103941606A (en) | 2014-07-23 |
| CN103941606B CN103941606B (en) | 2017-02-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104444256A (en) * | 2014-10-27 | 2015-03-25 | 中国神华能源股份有限公司 | Control method and system used for weighing-type belt coal feeder |
| CN105334771A (en) * | 2015-11-04 | 2016-02-17 | 范学文 | DCS-based coal feeder control system and method |
| CN112462597A (en) * | 2020-11-26 | 2021-03-09 | 淮浙煤电有限责任公司凤台发电分公司 | Coal quantity logic calculation method for coal feeder by adopting SAMA (sampling and analysis) diagram |
| CN113086553A (en) * | 2021-02-22 | 2021-07-09 | 大唐七台河发电有限责任公司 | Coal amount calculating and controlling system for coal feeder of thermal power plant |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104444256A (en) * | 2014-10-27 | 2015-03-25 | 中国神华能源股份有限公司 | Control method and system used for weighing-type belt coal feeder |
| CN105334771A (en) * | 2015-11-04 | 2016-02-17 | 范学文 | DCS-based coal feeder control system and method |
| CN112462597A (en) * | 2020-11-26 | 2021-03-09 | 淮浙煤电有限责任公司凤台发电分公司 | Coal quantity logic calculation method for coal feeder by adopting SAMA (sampling and analysis) diagram |
| CN113086553A (en) * | 2021-02-22 | 2021-07-09 | 大唐七台河发电有限责任公司 | Coal amount calculating and controlling system for coal feeder of thermal power plant |
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| CN103941606B (en) | 2017-02-15 |
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