CN101625119B - Bed pressure control device of large circulating fluidized bed boiler - Google Patents
Bed pressure control device of large circulating fluidized bed boiler Download PDFInfo
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- CN101625119B CN101625119B CN2009100410734A CN200910041073A CN101625119B CN 101625119 B CN101625119 B CN 101625119B CN 2009100410734 A CN2009100410734 A CN 2009100410734A CN 200910041073 A CN200910041073 A CN 200910041073A CN 101625119 B CN101625119 B CN 101625119B
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Abstract
The invention relates to a self-developed bed pressure control device of a large circulating fluidized bed boiler. Bed pressure signals of a bed pressure adjusting loop pass an intelligent signal filter and then are processed by a multi-signal mean value selector, and then bed pressure data coordinating signals available for the bed pressure adjusting loop are formed. Various bed pressure measurement values first pass an intelligent signal filter formed from the combination of inertia filtering and weighting moving average, so that measured great and frequent bed pressure fluctuation can be eliminated and a signal which truly reflects bed pressure change can be obtained. A plurality of bed pressures after filtering processing are sent to a mean bed pressure data coordinating signal of a hearth, which is calculated by the multi-signal mean value selector. The invention realizes the first self-developed bed pressure control device of the large circulating fluidized bed boiler.
Description
Technical field
The present invention relates to a kind of operating control device that is applicable to large-size circulating fluidized bed (CFB) boiler of independent development, refer to a kind of especially by coordinating control CFBB dreg removing system to satisfy the large circulating fluidized bed boiler operating control device that burning control requires.
Background technology
Characteristics such as recirculating fluidized bed (CFB) boiler is wide with burning, fuel tolerance that it cleans, load regulation rate is wide, obtained in recent years developing rapidly, subcritical large-scale (evaporation capacity 1025t/h) CFB of independent development puts into commercial operation, the CFB of China has entered the developing stage of subcritical parameter, and the Large-scale CFB of independent development becomes one of preferred technology of thermal power plant.
It is very important that the bed of CFBB is pressed the normal operation for the decision CFBB, and normal operation wishes that it is identical that the bed in the CFBB is pressed everywhere, but in fact is difficult to reach.
Recirculating fluidized bed (CFB) boiler is provided with a plurality of pressure sensors, with this foundation of pressing as the adjusting bed.
The adjusting of bed pressure is to control by the slag cooler rotating speed that changes outside the CFBB, and the slag cooler branch is located at boiler outer A, B both sides, and every side slag cooler has many again, regulates each slag cooler rotating speed of change and can regulate the bed pressure.For example, increase exerting oneself of other slag cooler of homonymy immediately in case a side slag cooler is exerted oneself and reduced; Otherwise, reduce exerting oneself of other slag cooler of homonymy immediately, keep the total bed drain purge of this side constant, get final product the bed pressure that balance is controlled large-size circulating fluidized bed A/B both sides.
The CFB boiler is because combustion process is special, be difficult to satisfy the burning control of CFBB when making normal the operation for the effective conventional control method of pulverized-coal fired boiler, therefore for the CFB boiler its unique method for controlling combustion is arranged, introduction type CFB adopts the bilateral chamber structure that divides vent in the sides of a garment, the bed pressure-controlled is the proportional relation of storage of bed material in the control homonymy burner hearth, and it is to control by 2 deslagging cone valves regulating this side that every side bed is pressed.By the lime-ash jam, its aperture must not remain on the same position bed pressure-controlled in the past for fear of cone valve, and bed pressure-controlled signal needs will add oscillator signal by the position set point that pressure reduction output produces.
But because the Large-scale CFB of independent development and the CFB of introduction have very big difference at aspects such as boiler process structure, control modes, the effective bed of introduction type CFB pressure-controlled scheme can not satisfy the regulation and control requirement of independent development type CFB, press the signal that changes owing to can't extract true reflection bed, homemade for a long time CFB unit is not all realized the bed pressure-controlled always well.
Summary of the invention
Purpose of the present invention just provides a kind of large circulating fluidized bed boiler bed pressure control device that is applicable to independent development.
For achieving the above object, large circulating fluidized bed boiler bed pressure control device of the present invention is characterized in that comprising:
Bed is pressed signal conditioning circuit 1: contain the equal value selector 102 of intelligent signal wave filter 101 and many signals, the bed of each pressure sensor presses signal PDT respectively through handling through the equal value selector of too much signal behind the intelligent signal wave filter again, forms the average bed pressure signal PD that bed presses regulating loop to use;
Intelligent signal wave filter 101 is cascadedly combined by weighting moving average module (FILTER piece) and inertia filtration module (LAG piece);
The equal value selector 102 of many signals contains QUAL module, deviation alarm module or logic module and the signal handover module of pressing number of signals corresponding to bed, and an average module; The input of QUAL module is pressed signal through the bed behind the compound filter, the input of deviation alarm module presses bed last time of signal and selector to flatten average through the bed behind the compound filter, when being worth greater than certain, the deviation between described bed pressure signal and the bed pressing last time average exports bed pressing last time average, otherwise the pressure signal behind the output process compound filter; Or the output of logic module input QUAL quality judge module and deviation alarm module, and output control signals to the signal handover module by logic module, the N of signal handover module end and the input of Y end press bed last time of signal and selector to flatten average through the bed behind the compound filter, according to or the output control signal decision of logic module export in two input signals one; The average module is imported the output of each signal handover module, exports this bed and presses average to bed to press regulating loop;
Bed is pressed regulating loop 2: contain functional operation module 201, hand/adaptive switched module 202, deviation alarm module 203 and bed and press PID controller 204;
The bed of the smooth change of equal value selector 102 outputs of the many signals of deviation alarm module 203 input is pressed signal and load variations value to obtain bed through functional operation module arithmetic 201 and hand/adaptive switched module 202 and is pressed a set-point, exports both differences;
Bed is pressed the output of 204 input deviation alarm modules, 203 outputs of PID controller and the equal value selector 102 of many signals, exports the many executing agencies of slag cooler then to and coordinates loop 3;
The many executing agencies of slag cooler coordinate loop 3 and are divided into fluid bed A, the many executing agencies of B both sides slag cooler coordination loop 301,302, bed presses the deslagging command signal of PID controller output to deliver to A respectively, the loop is coordinated by slag cooler many executing agencies in B both sides, the loop is coordinated by many executing agencies of each side all the PID of containing controller 303, first, second, third hand/adaptive switched module 304,305,306 and adder Module 307
Coordinate in the loop in the many executing agencies of each side slag cooler, bed presses the deslagging command signal of PID controller output to transport to the hand/adaptive switched module 304,305 of each slag cooler deslagging control loop of this side successively again respectively after PID controller 303, first-hand/adaptive switched module 304, output afterwards changes the slag cooler rotating speed, satisfies bed and flattens the weighing apparatus requirement;
The hand in each slag cooler loop/adaptive switched module feeds back to PID controller 303 after also exporting adder 307 additions simultaneously to,
The adder 308 that the first-hand/adaptive switched module 304 in B side slag cooler loop has feedback to export to be located at B side slag cooler loop inlet and the subtracter 309 of A side slag cooler loop inlet, by revising the bias on the operator in the B side slag cooler loop, adjust the input in slag cooler loop, both sides, one side strengthens, opposite side equivalent reduces, and can reach artificial leveling.
Beneficial effect: on large circulating fluidized bed boiler, initiative adopts the intelligent signal wave filter that is combined into by inertia filtering, weighting moving average to handle at each pressure detection signal of bed pressure-controlled, then deliver to the equal value selector of many signals and calculate the average bed pressure, adopt the many executing agencies of left and right sides to coordinate the loop again, realized the large circulating fluidized bed boiler bed pressure-controlled of first independent development.
Description of drawings
Fig. 1 is large circulating fluidized bed boiler bed pressure control device embodiment theory of constitution figure of the present invention;
Fig. 2 is the weighting moving average filter electrograph that the bed of Fig. 1 embodiment is pressed signal conditioning circuit;
Fig. 3 is many signals mean value computation circuit diagram that the bed of Fig. 1 embodiment is pressed signal conditioning circuit;
Fig. 4 is that the bed of Fig. 1 embodiment is pressed the regulating loop enlarged drawing.
The specific embodiment
The present invention is described in further detail below in conjunction with specific embodiments and the drawings.
As shown in Figure 1, large circulating fluidized bed boiler bed pressure control device of the present invention comprises:
Bed is pressed signal conditioning circuit 1: contain the equal value selector 102 of intelligent signal wave filter 101 and many signals, the bed of each pressure sensor presses signal PDT respectively through handling through the equal value selector of too much signal behind the intelligent signal wave filter again, forms the average bed pressure signal PD that bed presses regulating loop to use;
Referring to Fig. 2 and Fig. 3, the intelligent signal wave filter is cascadedly combined by weighting moving average module (FILTER piece) and inertia filtration module (LAG piece), the bed of present embodiment press a signal be earlier through inertia filtering (LAG piece) again through weighting moving average module (FILTER piece), certainly also can be conversely.
The weighting moving average filter multiply by different weights to difference measured value constantly, and the weight near the measured value of current time is big more more, and with the sensitivity of raising system to current measurement data, its algorithm can recursively be expressed as:
In the formula:
---the current time filter value;
PV
i---i is measured value constantly;
α
i---level and smooth index, α
i∈ (0,1), and
N---window size.
Though through behind the weighting moving average filter, eliminate bed and press a measuring-signal high-frequency noises, bed presses a signal fluctuation to reduce, some high-frequency fluctuation still, data are steady inadequately.Also to pass through one order inertia filtering (LAG piece) for this reason, one order inertia filtering is a kind of method of LPF, can eliminate high frequency or low-frequency interference signal well, eliminate the bed that measures and press frequent significantly fluctuation, press signal to deliver to the equal value selector of many signals again for a plurality of after filtering is handled.
Referring to Fig. 3, the equal value selector 102 of many signals contains QUAL module, deviation alarm module or logic module and the signal handover module of pressing number of signals corresponding to bed, and an average module; The input of QUAL module is pressed signal through the bed behind the compound filter, the input of deviation alarm module presses bed last time of signal and selector to flatten average through the bed behind the compound filter, when being worth greater than certain, the deviation between described bed pressure signal and the bed pressing last time average exports bed pressing last time average, otherwise the pressure signal behind the output process compound filter; Or the output of logic module input QUAL quality judge module and deviation alarm module, and output control signals to the signal handover module by logic module, the N of signal handover module end and the input of Y end press bed last time of signal and selector to flatten average through the bed behind the compound filter, according to or the output control signal decision of logic module export in two input signals one; The average module is imported the output of each signal handover module, exports this bed and presses average to bed to press regulating loop.
The large circulating fluidized bed boiler of independent development, adopt single chamber structure of big breadth depth ratio, and the bed that is arranged on the air distribution plate is pressed measuring point, because emulsion zone is in the bubbling fluidized state in the stove, the pressure fluctuation of bed is violent, must from frequent significantly fluctuation, extract the signal that can reflect truly that the bed pressure changes, in order to eliminate the uncertainty in the measurement and the influence of equipment operation exception, obtain accurately, reliable measurement result, adopt the redundancy and the complementary processing method of a plurality of pressure sensor signals, and, obtain accurately by intelligent signal filtering, bed is pressed measurement result reliably.
This loop presses signal to carry out quality judgement (the QUAL piece among the figure) earlier to each, if the quality judge module finds that certain pressure exceeds situations such as bound or broken string and then is judged to bad quality, the average bed pressure value of exporting with selector by handoff block replaces this pressure afterwards, participates in the calculating of mean value as the good signal of this point with this; Then the good quality signal value of averaging that judges is calculated, again the numerical value of good quality signal and the average signal value of selector are compared, when the average signal deviation of this point value and selector is big, reject this signal, go out mean value with the last computation of selector and replace this signal to participate in the calculating of average signal; The average signal that the equal value selector of these many signals of so final formation calculates is as the adjustment signal of bed pressure regulating loop.
Bed is pressed regulating loop 2: referring to Fig. 1, contain functional operation module 201, hand/adaptive switched module 202, deviation alarm module 203 and bed and press PID controller 204;
The bed of the smooth change of equal value selector 102 outputs of the many signals of deviation alarm module 203 input is pressed signal and load variations value to obtain bed through functional operation module arithmetic 201 and hand/adaptive switched module 202 and is pressed a set-point, exports both differences;
Bed is pressed the output of 204 input deviation alarm modules, 203 outputs of PID controller and the equal value selector 102 of many signals, exports the many executing agencies of slag cooler then to and coordinates loop 3.
The many executing agencies of slag cooler coordinate loop 3 and are divided into fluid bed A, the many executing agencies of B both sides slag cooler coordination loop 301,302, bed presses the deslagging command signal of PID controller output to deliver to A respectively, the loop is coordinated by slag cooler many executing agencies in B both sides, the loop is coordinated by many executing agencies of each side all the PID of containing controller 303, first, second, third hand/adaptive switched module 304,305,306 and adder Module 307
Coordinate in the loop in the many executing agencies of each side slag cooler, bed presses the deslagging command signal of PID controller output to transport to the hand/adaptive switched module 304,305 of each slag cooler deslagging control loop of this side successively again respectively after PID controller 303, first-hand/adaptive switched module 304, output afterwards changes the slag cooler rotating speed, satisfies bed and flattens the weighing apparatus requirement;
The hand in each slag cooler loop/adaptive switched module feeds back to PID controller 303 after also exporting adder 307 additions simultaneously to,
The adder 308 that the first-hand/adaptive switched module 304 in B side slag cooler loop has feedback to export to be located at B side slag cooler loop inlet and the subtracter 309 of A side slag cooler loop inlet, by revising the bias on the operator in the B side slag cooler loop, adjust the input in slag cooler loop, both sides, one side strengthens, opposite side equivalent reduces, and can reach artificial leveling.
After deslagging command signal and the stack of both sides deslagging leveling signal, deliver to both sides deslagging control loop respectively, form the deslagging deviation with this side slag cooler feedback, this deviation is delivered to this side PID controller, the output order of controller acts on each slag cooler of this side, change the slag cooler rotating speed, satisfy the requirement of deslagging.In case a side slag cooler is exerted oneself and reduced, the output of this side PID controller changes, and increases exerting oneself of other slag cooler of homonymy immediately; Otherwise, reduce exerting oneself of other slag cooler of homonymy immediately, keep this side bed drain purge constant, balance is controlled the bed of large-size circulating fluidized bed A/B both sides and is pressed.
Claims (3)
1. large circulating fluidized bed boiler bed pressure control device is characterized in that comprising: bed presses signal conditioning circuit, bed to press regulating loop and the many executing agencies of slag cooler to coordinate the loop:
Described bed is pressed signal conditioning circuit (1): contain intelligent signal wave filter (101) and the equal value selector of many signals (102), the bed of each pressure sensor is handled through the too much equal value selector of signal (102) after pressing signal PDT to pass through intelligent signal wave filter (101) respectively again, forms the average bed pressure signal PD that bed presses regulating loop to use;
Intelligent signal wave filter (101) is cascadedly combined by weighting moving average module and inertia filtration module;
The equal value selector of many signals (102) contains corresponding to bed presses the quality of number of signals to judge QUAL module, deviation alarm module or logic module and signal handover module, and an average module; The input of QUAL module is pressed signal through the bed behind the compound filter, the input of deviation alarm module presses bed last time of signal and selector to flatten average through the bed behind the compound filter, when being worth greater than certain, the deviation between described bed pressure signal and the bed pressing last time average exports bed pressing last time average, otherwise the pressure signal behind the output process compound filter; Or the output of logic module input QUAL quality judge module and deviation alarm module, and output control signals to the signal handover module by logic module, the N of signal handover module end and the input of Y end press bed last time of signal and selector to flatten average through the bed behind the compound filter, according to or the output control signal decision of logic module export in two input signals one; The average module is imported the output of each signal handover module, exports this bed and presses average to bed to press regulating loop.
2. large circulating fluidized bed boiler bed pressure control device according to claim 1 is characterized in that:
Described bed is pressed regulating loop (2) to contain functional operation module (201), hand/adaptive switched module (202), deviation alarm module (203) and bed and is pressed PID controller (204);
The bed of the smooth change of deviation alarm module (203) the input equal value selectors of many signals (102) output is pressed signal and load variations value to obtain bed through functional operation module arithmetic (201) and hand/adaptive switched module (202) and is pressed a set-point, exports both differences;
Bed is pressed the output of PID controller (204) input deviation alarm module (203) output and the equal value selector of many signals (102), exports the many executing agencies of slag cooler then to and coordinates loop (3).
3. large circulating fluidized bed boiler bed pressure control device according to claim 2 is characterized in that:
The many executing agencies of described slag cooler coordinate loop (3) and are divided into fluid bed A, the many executing agencies of B both sides slag cooler coordination loop (301,302), bed presses the deslagging command signal of PID controller output to deliver to A respectively, the loop is coordinated by slag cooler many executing agencies in B both sides, and the loop is coordinated by many executing agencies of each side all the PID of containing controller (303), first, second, third hand/adaptive switched module (304,305,306) and adder Module (307);
Coordinate in the loop in the many executing agencies of each side slag cooler, bed presses the deslagging command signal of PID controller output to transport to the hand/adaptive switched module (304,305) of each slag cooler deslagging control loop of this side successively again respectively after PID controller (303), first-hand/adaptive switched module (304), output afterwards changes the slag cooler rotating speed, satisfies bed and flattens the weighing apparatus requirement;
The hand in each slag cooler loop/adaptive switched module feeds back to PID controller (303) after also exporting adder (307) addition simultaneously to;
The adder (308) that the first-hand/adaptive switched module (304) in B side slag cooler loop has feedback to export to be located at B side slag cooler loop inlet and the subtracter (309) of A side slag cooler loop inlet, by revising the bias on the operator in the B side slag cooler loop, adjust the input in slag cooler loop, both sides, one side strengthens, opposite side equivalent reduces, and can reach artificial leveling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100410734A CN101625119B (en) | 2009-07-13 | 2009-07-13 | Bed pressure control device of large circulating fluidized bed boiler |
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|---|---|---|---|
| CN2009100410734A CN101625119B (en) | 2009-07-13 | 2009-07-13 | Bed pressure control device of large circulating fluidized bed boiler |
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| CN101625119B true CN101625119B (en) | 2011-09-28 |
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| CN101949536B (en) * | 2010-09-14 | 2013-04-10 | 广东电网公司电力科学研究院 | Balanced coal supply control device of large circulating fluidized bed boiler |
| CN102788349B (en) * | 2012-04-25 | 2014-12-10 | 广东电网公司电力科学研究院 | Large-sized biomass direct-fired circulating fluidized bed boiler furnace negative pressure control device |
| CN111811441B (en) * | 2020-06-19 | 2023-03-21 | 广东电网有限责任公司 | Surface construction process detection device and method |
| CN111998344A (en) * | 2020-08-04 | 2020-11-27 | 北京市八宝山殡仪馆 | Cremation machine furnace pressure safety control system |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510060 No. 73 Meihua Road, Guangzhou, Guangdong, Yuexiu District Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |