CN103941606B - Thermal power plant weighing coal feeder control logic - Google Patents
Thermal power plant weighing coal feeder control logic Download PDFInfo
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- CN103941606B CN103941606B CN201410155008.5A CN201410155008A CN103941606B CN 103941606 B CN103941606 B CN 103941606B CN 201410155008 A CN201410155008 A CN 201410155008A CN 103941606 B CN103941606 B CN 103941606B
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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 control logic.
Background technology
At present, existing weighing coal feeder belt conveyer scale control principle is：As shown in figure 1, LOAD CELLS is collected
The feeder adhesive tape running speed signal that collects with speed probe of coal amount signal instantaneous delivery is drawn by integral algorithm
Signal, by DCS（Scattered control system）To coal output control instruction, after feeder controls integrating instrument to receive DCS instruction on the spot
By contrasting with instantaneous coal amount, after calculating, issue a command to converter, then by Frequency Converter Control feeder rotating speed, thus reaching control
The purpose of coal amount.For this reason, DCS does not design directly transmits instruction to converter, as shown in figure 1, typically without PID controller even
Connect wherein to maintain to signal variable numerical value, but pass through front height limiter（301）, functional generator（302）, front plus
Method block（303）, analog quantity handoff block（304）, manual arrange parameter（305）, rear adder block（306）, M/A station（307）, rate of change
Limiter one（308）, rate of change limiter two（309）, rear height limiter（310）Realize the maintenance to signal variable numerical value,
There is significant limitation.
And integrating instrument, LOAD CELLS and speed probe are easy to break down, now because DCS cannot directly transmit
Instruct to converter, and the shortage in terms of control function due to DCS, operations staff's Non-follow control also must be real through integrating instrument
Existing, therefore often lead to can only at once by force will be out of service for complete equipment it is impossible to effectively be carried out by operations staff's Non-follow control
Operation before maintenance down, is that injury is very big to equipment, specifically, if operations staff does not find when fault occurs,
Integrating instrument continues error running, then more likely normal production is caused greatly to damage, and the safe and stable operation of unit lacks to be protected
Barrier.
Content of the invention
For solving above-mentioned technical problem, the invention provides a kind of Weighing type coal feeder in heat power plant control logic, should
Weighing type coal feeder in heat power plant control logic by being directly output to the structure of converter by DCS output signal, and weight
New design DCS logic, addition PID controller, so that operations staff can be manually entered instruction and control feeder to run, it is to avoid
Impact because of the coal amount fluctuation that integrating instrument fault is brought, it is to avoid unit load down runs and throws oil and runs it is ensured that unit
Safe and stable operation reduces oil consumption.
The present invention is achieved by the following technical programs.
A kind of Weighing type coal feeder in heat power plant control logic that the present invention provides, operations staff gives coal amount instruction mould
Block, DCS logical operation module, integrating instrument, converter, motor are sequentially connected, and motor is also associated with LOAD CELLS and rotating speed passes
Sensor, LOAD CELLS and signals of rotational speed sensor outfan be connected to integrating instrument it is characterised in that：Described DCS logical operationss
Module by signal outfan is connected to converter.
Described integrating instrument is that MW96C type controls integrating instrument on the spot.
Described motor is adhesive tape motor.
The coal-supplying amount that described DCS logical operation module input accesses operations staff's given coal amount instruction module output refers to
Make, coal feeder rotating speed control system instructs, feeder is stopped transport, feeder runs；Coal-supplying amount instruction is separately input into adder block after accessing
With M/A station；Coal feeder rotating speed control system instruction inputs to analog quantity handoff block after accessing；Feeder is stopped transport after accessing and is inputted to the time
Functional device one；Feeder runs after accessing and inputs to time function block two.
Described DCS logical operation module input accesses the instantaneous coal amount feedback of integrating instrument output, coal-supplying amount instructs and anti-
Feedback deviation is big, instantaneous coal amount feedback is forbidden, instantaneous coal amount feeds back signal bad signal；Instantaneous coal amount feedback is separately input into after accessing
Adder block and M/A station；Coal-supplying amount instruction is big with feedback deviation, instantaneous coal amount feedback is forbidden, instantaneous coal amount feedback signal is bad accesses
All input afterwards to OR gate block.
Manual setting coefficient is also included, setting coefficient inputs to mould manually in the input of described DCS logical operation module
Analog quantity handoff block.
Described adder block outfan connects to PID block input；Described analog quantity handoff block outfan is respectively connecting to PID
Block and the input at M/A station；The outfan of described time function block one and time function block two is connected to the input at M/A station
End；Described time function block one outfan is additionally coupled to OR gate block input；The outfan of described OR gate block connects to M/A station
Input；The outfan at described M/A station connects to the input of PID block；The outfan at M/A station also exports feeder rotating speed and refers to
Order.
Described adder block outfan connects to the PV end of PID block；Described analog quantity handoff block outfan is respectively connecting to PID
The N/A end of block and the TR end at M/A station；The outfan SP end at described M/A station and A end are respectively connecting to the input TR end of PID block
With TP end.
The outfan of described time function block one and time function block two is respectively connecting to TS end and the AX end at M/A station；Institute
The outfan stating OR gate block connects to the MI end at M/A station；The outfan O end output feeder rotary speed instruction at M/A station.
Described port standard adopts the DCS system standard of ABB AB.
The beneficial effects of the present invention is：By DCS output signal being directly output to the structure of converter, and again
Design DCS logic, addition PID controller, so that operations staff can be manually entered instruction and control feeder to run, it is to avoid
Impact because of the coal amount fluctuation that integrating instrument fault is brought, it is to avoid unit load down runs and throws oil and runs it is ensured that unit is pacified
Full stable operation reduces oil consumption.
Brief description
Fig. 1 is the logic connectivity diagram of prior art；
Fig. 2 is the logic connectivity diagram of DCS logical operationss in prior art；
Fig. 3 is the logic connectivity diagram of the present invention；
Fig. 4 is the logic connectivity diagram of DCS logical operationss in the present invention；
In figure：101- coal-supplying amount instructs, and 102- instantaneous coal amount is fed back, and 103- coal feeder rotating speed control system instructs, and 104- is to coal
Machine is stopped transport, and 105- feeder runs, and the instruction of 106- coal-supplying amount is big with feedback deviation, and 107- instantaneous coal amount feedback is inaccurate, 108- wink
When coal amount feedback signal bad, 109- feeder rotary speed instruction, 110- boiler supplied materials instructs, 111- coal feeder rotating speed control system manually,
201- arranges coefficient, 202- adder block, 203- analog quantity handoff block, 204- time function block one, 205- time function block manually
Two, 206-PID block, 207-M/A stands, height limiter before 301-, 302- functional generator, adder block before 303-, and 304- simulates
Amount handoff block, the manual arrange parameter of 305-, adder block after 306-, 307-M/A stands, 308- rate of change limiter one, and 309- changes
Rate limiter two, height limiter after 310-.
Specific embodiment
Technical scheme be described further below, but claimed scope be not limited to described.
A kind of Weighing type coal feeder in heat power plant control logic as shown in Figure 3, operations staff gives coal amount instruction mould
Block, DCS logical operation module, integrating instrument, converter, motor are sequentially connected, and motor is also associated with LOAD CELLS and rotating speed passes
Sensor, LOAD CELLS and signals of rotational speed sensor outfan be connected to integrating instrument it is characterised in that：Described DCS logical operationss
Module by signal outfan is connected to converter.
Described integrating instrument is that MW96C type controls integrating instrument on the spot.
Described motor is adhesive tape motor.
As shown in Fig. 2 described DCS logical operation module input accesses operations staff gives the output of coal amount instruction module
Coal-supplying amount instruction 101, coal feeder rotating speed control system instruction 103, feeder stoppage in transit 104, feeder run 105；Coal-supplying amount instruction 101
It is separately input into adder block 202 and M/A station 207 after access；Coal feeder rotating speed control system instruction 103 inputs after accessing and cuts to analog quantity
Change block 203；Feeder stoppage in transit 104 inputs to time function block 1 after accessing；Feeder run 105 access after input to when
Between functional device 2 205.
Described DCS logical operation module input access the instantaneous coal amount feedback 102 of integrating instrument output, coal-supplying amount instruction with
Feedback deviation is big 106, instantaneous coal amount feedback is inaccurate 107, bad 108 signals of instantaneous coal amount feedback signal；Instantaneous coal amount feedback 102 connects
It is separately input into adder block 202 and M/A station 207 after entering；It is inaccurate that coal-supplying amount instructs big with feedback deviation 106, instantaneous coal amount feedback
107th, instantaneous coal amount feedback signal bad 108 all inputs to OR gate block after accessing.
Manual setting coefficient 201 is also included, setting coefficient 201 is defeated manually in the input of described DCS logical operation module
Enter to analog quantity handoff block 203.
Described adder block 202 outfan connects to PID block 206 input；Described analog quantity handoff block 203 outfan is respectively
Connect to the input of PID block 206 and M/A station 207；Described time function block 1 and the outfan of time function block 2 205
It is connected to the input at M/A station 207；Described time function block 1 outfan is additionally coupled to OR gate block input；Described or
The outfan of door block connects to the input at M/A station 207；The outfan at described M/A station 207 connects to the input of PID block 206
End；The outfan at M/A station 207 also exports feeder rotary speed instruction 109.
Described adder block 202 outfan connects to the PV end of PID block 206；Described analog quantity handoff block 203 outfan is respectively
Connect to the N/A end of PID block 206 and M/A stand 207 TR end；The outfan SP end at described M/A station 207 and A end are respectively connecting to
The input TR end of PID block 206 and TP end.
The outfan of described time function block 1 and time function block 2 205 is respectively connecting to the TS end at M/A station 207
With AX end；The outfan of described OR gate block connects to the MI end at M/A station 207；The outfan O end output feeder at M/A station 207 turns
Speed instruction 109.
Described port standard adopts the DCS system standard of ABB AB.
Thus, the logic calculating coal amount in original integrating instrument on the spot is incorporated in DCS logical operation module well, by
The direct output speed of DCS logical operation module instructs converter, directly controls the rotating speed of adhesive tape motor.Control strategy optimization
Afterwards, coal-supplying amount is instructed to be compared with instantaneous coal amount and sends into PID block 206 in DCS logical operation module afterwards, and PID block 206 exports to M/A
Stand 207, then feeder rotary speed instruction 109 is sent by M/A station 207 and control feeder converter rotating speed.When feeder runs, send out
Pulse signal cuts automatic running to M/A station 207, and operations staff can be allowed directly only to operate given coal amount instruction.When instantaneous coal amount
Feedback is inaccurate or during fault, manual operation is cut at M/A station 207, and now, operations staff can be manually entered instruction control.
Obviously, boiler supplied materials instruction 110 can also be eliminated in DCS logical operation module and coal feeder rotating speed control system is manual
111 signal input.
Meanwhile, M/A station 207 is directly sent feeder rotary speed instruction 109 and also be largely avoid rate of change restriction
The distorted signals that device 2 309, rear height limiter 310 may bring.
Claims (6)
1. a kind of Weighing type coal feeder in heat power plant control logic circuit, operations staff gives coal amount instruction module, DCS logic
Computing module, integrating instrument, converter, motor are sequentially connected, and motor is also associated with LOAD CELLS and speed probe, biography of weighing
Sensor and signals of rotational speed sensor outfan be connected to integrating instrument it is characterised in that：Described DCS logical operation module signal output
End is connected to converter；Described DCS logical operation module input accesses operations staff and gives giving of coal amount instruction module output
Coal amount instruction (101), coal feeder rotating speed control system instruction (103), feeder are stopped transport (104), feeder runs (105)；Coal-supplying amount
Instruction (101) is separately input into adder block (202) and M/A station (207) after accessing；Coal feeder rotating speed control system instruction (103) accesses
After input to analog quantity handoff block (203)；Feeder is stopped transport after (104) are accessed and is inputted to time function block one (204)；Feeder
Run after (105) are accessed and input to time function block two (205).
2. Weighing type coal feeder in heat power plant control logic circuit as claimed in claim 1 it is characterised in that：Described integrating
Instrument is that MW96C type controls integrating instrument on the spot.
3. Weighing type coal feeder in heat power plant control logic circuit as claimed in claim 1 it is characterised in that：Described motor
For adhesive tape motor.
4. Weighing type coal feeder in heat power plant control logic circuit as claimed in claim 1 it is characterised in that：Described DCS
Instantaneous coal amount feedback (102) of logical operation module input access integrating instrument output, coal-supplying amount instruction are big with feedback deviation
(106), instantaneous coal amount feedback inaccurate (107), instantaneous coal amount feedback signal bad (108) signal；Instantaneous coal amount feedback (102) is accessed
After be separately input into adder block (202) and M/A station (207)；Coal-supplying amount instruction and feedback deviation big (106), instantaneous coal amount feedback
Inaccurate (107), instantaneous coal amount feedback signal bad (108) all input to OR gate block after accessing.
5. Weighing type coal feeder in heat power plant control logic circuit as claimed in claim 1 it is characterised in that：Described DCS
Manual setting coefficient (201) is also included, setting coefficient (201) manually inputs and cuts to analog quantity in the input of logical operation module
Change block (203).
6. the Weighing type coal feeder in heat power plant control logic circuit as described in claim 1,4 or 5 it is characterised in that：Institute
State adder block (202) outfan to connect to PID block (206) input；Described analog quantity handoff block (203) outfan connects respectively
Input to PID block (206) and M/A station (207)；Described time function block one (204) and time function block two (205) defeated
Go out the input that end is connected to M/A station (207)；Described time function block one (204) outfan is additionally coupled to the input of OR gate block
End；The outfan of described OR gate block connects to the input of M/A station (207)；The outfan of described M/A station (207) connects to PID
The input of block (206)；The outfan of M/A station (207) also exports feeder rotary speed instruction (109).
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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 |
|---|---|---|---|
| CN201410155008.5A CN103941606B (en) | 2014-04-17 | 2014-04-17 | Thermal power plant weighing coal feeder control logic |
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| CN103941606A CN103941606A (en) | 2014-07-23 |
| CN103941606B true CN103941606B (en) | 2017-02-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104444256B (en) * | 2014-10-27 | 2017-07-28 | 中国神华能源股份有限公司 | A kind of control method and control system for Weighing type belt coal-feeding machine |
| 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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| US3957459A (en) * | 1974-04-04 | 1976-05-18 | Exxon Research And Engineering Company | Coal gasification ash removal system |
| CN202453059U (en) * | 2012-03-03 | 2012-09-26 | 国投曲靖发电有限公司 | Acquisition and data processing system for coal feed quantity of coal feeder |
| CN204028588U (en) * | 2014-04-17 | 2014-12-17 | 大唐贵州发耳发电有限公司 | A kind of feeder steering logic |
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