CN103791482A - Thermal power generating unit hearth pressure segmentation control method - Google Patents
Thermal power generating unit hearth pressure segmentation control method Download PDFInfo
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Abstract
The invention discloses a thermal power generating unit hearth pressure segmentation control method. The method includes the steps that pressure values of pressure measuring points of a hearth are collected, and a selector THRSEL outputs a measuring value PV which participates in hearth pressure adjustment; after the difference value between the measuring value PV and a hearth pressure set value SP is get, a deviation value of the measuring value PV and the set value SP is output; nonlinear processing is conducted on the deviation value of the measuring value PV and the set value SP according to the specific condition of equipment, and a segmented function F(x) is generated; output values of segments of the segmented function F(x) are sent to a PID operation module for adjustment and control; output of the PID operation module is sent to an A/B induced draft fan for actual control after balance operation. The thermal power generating unit hearth pressure segmentation control method has the advantages that it can be guaranteed that deviation of hearth pressure is not too large, it can be effectively avoided that hearth pressure slightly fluctuates due to measurement deviation, hearth combustion changes and the like to cause frequent and slight oscillation of the induced draft fan, and therefore the service life of the equipment is effectively prolonged.
Description
Technical field
The present invention relates to a kind of segmentation control method, especially a kind of fired power generating unit furnace pressure segmentation control method.
Background technology
Along with the develop rapidly of China's electric utility, critical role is occupied in thermal power plant in China's power industry.How to guarantee that monoblock is safe under nominal parameter, stable, economic operation is a considerable problem.As a complicated system, the top priority of boiler control is the stable operation of assurance equipment, by wind, coal and water three's amount is regulated, makes steam pressure, flow and the temperature of boiler export reach the desired value needing.Wherein, guarantee that for most of boilers the fundamental prerequisite of its safe operation is the combustion chamber draft that remains suitable, comparatively safe, the status of hearth vacuum control (air output control) is very important.And combustion chamber draft is larger on economical combustion impact, he affects combustion position and heat exhaust loss, so in actual boiler control system, hearth vacuum control (air output control) loop is defined as to the first control loop, the highest to represent negative pressure control level of security.For negative-pressure firing boiler, if furnace pressure close to atmospheric pressure, stove cigarette is emerged outward, energy waste and affect equipment and staff's safety; Otherwise, if furnace pressure is too low, can make again a large amount of cold airs bleed in burner hearth, reduce fire box temperature, increase the thermal loss that air-introduced machine load and smoke evacuation are taken away.General furnace pressure maintains the left and right than the low 20-50Pa of atmospheric pressure.Combustion chamber draft is larger on economical combustion impact, and he affects combustion position and heat exhaust loss.
The task of air-introduced machine control is to keep combustion chamber draft within the scope of regulation.Because the dynamic response of air inducing controlled plant is fast, it is also comparatively easy to measure, so the general single loop control system of employing using combustion chamber draft as regulated variable that only need of air output control system.During due to the variation of air output, cause the main cause of negative pressure fluctuation, in order to make air inducing amount follow the tracks of rapidly air output, to keep the ratio of the two, air output can be introduced to air inducing adjuster as feedforward.In the time that air supply control system moves, air output control system also follows by action immediately like this, rather than etc. combustion chamber draft move again after departing from set-point, thereby can make combustion chamber draft substantially remain unchanged.After so air output control system is introduced air-supply feed-forward signal, the dynamic deviation that improves the stability of air output control system and reduce combustion chamber draft being conducive to.But due to the problem such as certainty of measurement, the easy obstruction of measurement point of furnace pressure transmitter; and hearth combustion situation complexity; be subject to the many factors such as ature of coal variation; in service in actual set, often there will be Furnace pressure adjust system output order fluctuation frequently affect equipment life and automatically can not bringing normally into operation etc. problem.
Summary of the invention
Object of the present invention is exactly for addressing the above problem, a kind of thermal power generation unit hearth pressure control method is provided, it can effectively improve unit air-introduced machine control performance, effectively guarantee the bringing normally into operation of automatic regulating system, avoid air-introduced machine frequent fluctuation, be conducive to improve the stability of air output control system.
To achieve these goals, the present invention adopts following technical scheme:
A kind of fired power generating unit furnace pressure segmentation control method, comprising:
(1) force value of collection furnace pressure measuring point, participates in by selector THRSEL output the measured value PV that furnace pressure regulates; Measured value PV and furnace pressure setting value SP ask after difference, the deviate of outputting measurement value PV and setting value SP.
(2) deviate of measured value PV and setting value SP is carried out to Nonlinear Processing according to equipment concrete condition, generate piecewise function F (x).
(3) each section output valve of piecewise function F (x) is delivered to PID computing module and is regulated control, and the output of PID module is through overbalance computing, then delivers to and in A/B air-introduced machine, carries out working control:
F (x) is in the time of the first section, and air-introduced machine does not participate in furnace pressure and regulates.
F (x) is in the time of the second section, and air-introduced machine trace regulates furnace pressure.
F (x) in the time of the 3rd section, the linear rapid adjustment furnace pressure of air-introduced machine.
Described piecewise function F (x) is specially:
Wherein, A is the interval limit value of F (x); B is the maximum deviation that unit allows air-introduced machine control.
Furnace pressure measuring point is 3 in described step (1), and better if 3 measuring points are, measured value PV gets the mean value of three measuring points.
If there is a furnace pressure measuring point to become bad point, outputting measurement value PV gets all the other 2 better mean values.
If there are 2 furnace pressure measuring points to become bad point, outputting measurement value PV gets 1 better measured value of residue.
If 3 furnace pressure measuring points are all bad point, output remains the measured value before degenerating a little.
The first section of described F (x) is specially:
When the output of subtraction block DEV is during at piecewise interval-Ld～+ Ld, the output valve of F (x) is 0, and now air-introduced machine does not participate in regulating, and instruction remains unchanged.
Wherein, ± Ld is the dead zone range of F (x); Get Ld=(30%～50%) * Le, Le is the error amount that the measured value that calculates according to the measurement category of furnace pressure transmitter precision and pressure transmitter allows.
The second section of described F (x) is specially:
Be output as-Ld of DEV～-Le and+when Ld～+ Le, be respectively-A～0 of output valve and 0～+ A that F (x) is corresponding, now air-introduced machine can appropriateness be adjusted aperture, trace regulates furnace pressure.
Wherein, A is the interval limit value of F (x).
The 3rd section of described F (x) is specially:
Be output as-Le of DEV～-B and+when Le～+ B, be respectively-A of output valve～-B that F (x) is corresponding and+A～+ B, now the linear rapid adjustment furnace pressure of air-introduced machine, guarantees that burner hearth actual pressure can retract fast, operates near setting value it.
Wherein, B is the maximum deviation that unit allows air-introduced machine control.
Described interval limit value A is between ± 5～± 10.
The function of F (x) represents as shown in table 1.In this table, interval limit value A gets ± 5, unit allow the maximum deviation B of air-introduced machine control get ± 500.
Table 1
The invention has the beneficial effects as follows:
The present invention carries out by stages section processing by the setting value to furnace pressure and actual measured value, adopt function to drift correction, can effectively improve unit air-introduced machine control performance, be conducive to improve the stability of air output control system, effectively guarantee the bringing normally into operation of automatic regulating system, can guarantee that furnace pressure is unlikely to deviation excessive, can effectively prevent that again the furnace pressure minor swing that measured deviation and hearth combustion variation etc. cause from making the frequent oscillation on small scale problem of air-introduced machine, effectively extended the service life of equipment.
Accompanying drawing explanation
Fig. 1 is conventional fired power generating unit furnace pressure control logic figure;
Fig. 2 is fired power generating unit furnace pressure control logic figure after optimizing;
Fig. 3 optimizes rear fired power generating unit furnace pressure actual operation curve figure.
The specific embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
, resuperheat subcritical to certain 300MW, the coal-fired unit furnace pressure of condensing-type are controlled.
Traditional control method as shown in Figure 1.By one-out-three selector, THRSEL selects, and is traditionally arranged to be and chooses intermediate value, if there is a furnace pressure measuring point to become bad point, THRSEL module is output as all the other 2 better mean values; If there are 2 furnace pressure measuring points to become bad point, THRSEL module is output as 1 better measured value of residue; If three is all bad point, export constantly, remain a before measurement value that degenerates.The output of THRSEL module is and participates in the measured value PV that furnace pressure regulates, it asks difference with the furnace pressure setting value SP setting by analog quantity setting module A through subtraction block DEV, and difference is delivered to PID(proportional-integral-differential) computing module regulates control; FF represents the feedforward of PID controller, is multiplied by a ratio value generates by pressure fan regulating command, represents the command signal of boiler air requirement, and object is to reduce the fluctuation that furnace pressure regulates as far as possible; The output of PID module is delivered in gain balance module BALANCE and is carried out balance computing, then delivers to and in A/B air-introduced machine, carries out working control.
The method is due to the problem such as certainty of measurement, the easy obstruction of measurement point of furnace pressure transmitter; and hearth combustion situation complexity; be subject to the many factors such as ature of coal variation; in service in actual set, often there will be Furnace pressure adjust system output order fluctuation frequently affect equipment life and automatically can not bringing normally into operation etc. problem.
Control method of the present invention is:
(1) furnace pressure measuring point is selected by selector THRSEL, output participates in the measured value PV that furnace pressure regulates.
(2) measured value PV asks difference with the furnace pressure setting value SP setting by analog quantity setting module A through subtraction block DEV, obtains the deviate of measured value PV and setting value SP.
(3) deviate of measured value PV and setting value SP is carried out to Nonlinear Processing according to equipment concrete condition, generate nonlinear function F (x).Concrete steps are:
According to power industry relevant criterion, the precision of furnace pressure transmitter is not less than 0.3 grade, is also 0.3% with regard to the limits of error, and the measurement category of furnace pressure transmitter is-3000Pa to 3000Pa conventionally.
Step 1. calculates the error amount that measured value allows, Le=[3000-(3000) according to the measurement category of furnace pressure transmitter precision and pressure transmitter] * 0.3=18;
The deviate that step 2. allows according to the measured value calculating, dead zone range ± Ld of F (x) is set, the interval limit value of furnace pressure of this unit is got Ld=30%Le=5.4 ≈ 5, when the output of DEV is when namely the input value of F (x) is in the first piecewise interval-5～+ 5, the output valve of corresponding F (x) is 0, now air-introduced machine does not participate in regulating, and instruction remains unchanged;
Step 3. arranges the second piecewise interval, be output as-Ld of DEV～-Le and+when Ld～+ Le, at-5～-18 o'clock, the output valve of F (x) is 0～-5, + 5～+ 18 o'clock F (x) output valve be 0～+ 5, air-introduced machine can appropriateness adjust aperture, trace regulate furnace pressure;
Step 4. arranges the 3rd piecewise interval, DEV is output as at-18～100 and+18～+ 100 o'clock, the output valve that now F (x) is corresponding is respectively-5～-100 and+5～+ 100, it is the now linear furnace pressure of adjusting of air-introduced machine, guarantee that burner hearth actual pressure operates near setting value, herein higher limit 500 become 100 be because this unit claim exceed in deviation ± 100 o'clock, exit air-introduced machine automatic, become manual control.
The function of F (x) represents as shown in table 2:
Table 2
As shown in Figure 3, as can be seen from Figure 3, in the first piecewise interval is the interval limit value of furnace pressure time, air-introduced machine regulating command remains unchanged fired power generating unit furnace pressure actual operation curve of the present invention; Can find out the regulations speed in the regulations speed of the air-introduced machine regulating command of the second piecewise interval lower than the air-introduced machine regulating command of the second piecewise interval from the slope of instruction.Can guarantee that like this furnace pressure is unlikely to deviation excessive, can effectively prevent that again the furnace pressure minor swing that measured deviation and hearth combustion variation etc. cause from making the frequent oscillation on small scale problem of air-introduced machine, effectively extend the service life of equipment.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (7)
1. a fired power generating unit furnace pressure segmentation control method, is characterized in that, comprising:
(1) force value of collection furnace pressure measuring point, participates in by selector THRSEL output the measured value PV that furnace pressure regulates; Measured value PV and furnace pressure setting value SP ask after difference, the deviate of outputting measurement value PV and setting value SP;
(2) deviate of measured value PV and setting value SP is carried out to Nonlinear Processing according to equipment concrete condition, generate piecewise function F (x);
(3) each section output valve of piecewise function F (x) is delivered to PID computing module and is regulated control, and the output of PID module is through overbalance computing, then delivers to and in A/B air-introduced machine, carries out working control:
F (x) is in the time of the first section, and air-introduced machine does not participate in furnace pressure and regulates;
F (x) is in the time of the second section, and air-introduced machine trace regulates furnace pressure;
F (x) in the time of the 3rd section, the linear rapid adjustment furnace pressure of air-introduced machine.
2. a kind of fired power generating unit furnace pressure segmentation control method as claimed in claim 1, is characterized in that, described piecewise function F (x) is specially:
Wherein, A is the interval limit value of F (x); B is the maximum deviation that unit allows air-introduced machine control.
3. a kind of fired power generating unit furnace pressure segmentation control method as claimed in claim 1, is characterized in that, furnace pressure measuring point is 3 in described step (1), and better if 3 measuring points are, measured value PV gets the mean value of three measuring points;
If there is a furnace pressure measuring point to become bad point, outputting measurement value PV gets all the other 2 better mean values;
If there are 2 furnace pressure measuring points to become bad point, outputting measurement value PV gets 1 better measured value of residue;
If 3 furnace pressure measuring points are all bad point, output remains the measured value before degenerating a little.
4. a kind of fired power generating unit furnace pressure segmentation control method as claimed in claim 1, is characterized in that, the first section of described F (x) is specially:
When the output of subtraction block DEV is during at piecewise interval-Ld～+ Ld, the output valve of F (x) is 0, and now air-introduced machine does not participate in regulating, and instruction remains unchanged;
Wherein, ± Ld is the dead zone range of F (x); Get Ld=(30%～50%) * Le, Le is the error amount that the measured value that calculates according to the measurement category of furnace pressure transmitter precision and pressure transmitter allows.
5. a kind of fired power generating unit furnace pressure segmentation control method as claimed in claim 1, is characterized in that, the second section of described F (x) is specially:
Be output as-Ld of DEV～-Le and+when Ld～+ Le, be respectively-A～0 of output valve and 0～+ A that F (x) is corresponding, now air-introduced machine can appropriateness be adjusted aperture, trace regulates furnace pressure;
Wherein, A is the interval limit value of F (x).
6. a kind of fired power generating unit furnace pressure segmentation control method as claimed in claim 1, is characterized in that, the 3rd section of described F (x) is specially:
Be output as-Le of DEV～-B and+when Le～+ B, be respectively-A of output valve～-B that F (x) is corresponding and+A～+ B, now the linear rapid adjustment furnace pressure of air-introduced machine, guarantees that burner hearth actual pressure can retract fast, and it is operated near setting value;
Wherein, B is the maximum deviation that unit allows air-introduced machine control.
7. a kind of fired power generating unit furnace pressure segmentation control method as claimed in claim 5, is characterized in that, described dead band limit value A is between ± 5～± 10.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104073624A (en) * | 2014-07-15 | 2014-10-01 | 中冶南方工程技术有限公司 | Pressure control method for furnace chamber of vertical continuous annealing furnace |
| CN104848194A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and system for draft control of thermal power generating unit applicable to environmental-friendly control technology |
| CN104932566A (en) * | 2015-06-05 | 2015-09-23 | 国网山东省电力公司电力科学研究院 | Control system and method for improving the rapid boiler adjusting capability of unit generating set |
| CN105843035A (en) * | 2016-03-17 | 2016-08-10 | 中国神华能源股份有限公司 | Method of controlling PID output used for unit set and apparatus thereof |
| CN106773644A (en) * | 2016-11-18 | 2017-05-31 | 国网山东省电力公司电力科学研究院 | A kind of AGC control systems and its method based on the change of the heat supply amount of drawing gas |
| CN108345295A (en) * | 2018-03-23 | 2018-07-31 | 大唐韩城第二发电有限责任公司 | A kind of analog quantity multi-measuring point logical algorithm |
| CN110145761A (en) * | 2019-05-21 | 2019-08-20 | 江苏方天电力技术有限公司 | A kind of BFG boiler negative pressure optimal control method |
| CN110989708A (en) * | 2019-10-30 | 2020-04-10 | 华电电力科学研究院有限公司 | Pressure feedforward control method based on decision function |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073624A (en) * | 2014-07-15 | 2014-10-01 | 中冶南方工程技术有限公司 | Pressure control method for furnace chamber of vertical continuous annealing furnace |
| CN104073624B (en) * | 2014-07-15 | 2016-06-29 | 中冶南方工程技术有限公司 | A kind of vertical continuous annealing furnace hearth pressure control method |
| CN104848194A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and system for draft control of thermal power generating unit applicable to environmental-friendly control technology |
| CN104932566A (en) * | 2015-06-05 | 2015-09-23 | 国网山东省电力公司电力科学研究院 | Control system and method for improving the rapid boiler adjusting capability of unit generating set |
| CN104932566B (en) * | 2015-06-05 | 2017-09-29 | 国网山东省电力公司电力科学研究院 | A kind of control system and method for improving the quick adjustment capability of elementary generator group boiler |
| CN105843035A (en) * | 2016-03-17 | 2016-08-10 | 中国神华能源股份有限公司 | Method of controlling PID output used for unit set and apparatus thereof |
| CN106773644A (en) * | 2016-11-18 | 2017-05-31 | 国网山东省电力公司电力科学研究院 | A kind of AGC control systems and its method based on the change of the heat supply amount of drawing gas |
| CN106773644B (en) * | 2016-11-18 | 2017-09-29 | 国网山东省电力公司电力科学研究院 | A kind of AGC control systems and its method changed based on the heat supply amount of drawing gas |
| CN108345295A (en) * | 2018-03-23 | 2018-07-31 | 大唐韩城第二发电有限责任公司 | A kind of analog quantity multi-measuring point logical algorithm |
| CN110145761A (en) * | 2019-05-21 | 2019-08-20 | 江苏方天电力技术有限公司 | A kind of BFG boiler negative pressure optimal control method |
| CN110989708A (en) * | 2019-10-30 | 2020-04-10 | 华电电力科学研究院有限公司 | Pressure feedforward control method based on decision function |
| CN110989708B (en) * | 2019-10-30 | 2023-02-28 | 华电电力科学研究院有限公司 | Pressure feedforward control method based on decision function |
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