CN104296120A - Hearth pressure control method and hearth pressure control system - Google Patents
Hearth pressure control method and hearth pressure control system Download PDFInfo
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- CN104296120A CN104296120A CN201410527712.9A CN201410527712A CN104296120A CN 104296120 A CN104296120 A CN 104296120A CN 201410527712 A CN201410527712 A CN 201410527712A CN 104296120 A CN104296120 A CN 104296120A
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Abstract
The invention discloses a hearth pressure control method and a hearth pressure control system. The hearth pressure control method includes that setting a loop regulating module for hearth pressure regulation and setting a unusual service condition identifying loop before setting the loop regulating module, wherein the control mode for the unusual service condition identifying loop includes that doing not regulate when the hearth pressure is lowered quickly, and quickly regulating when the hearth pressure is restored and increased in a positive mode. Through arranging the unusual service condition identifying loop in a hearth pressure control loop, a negative pressure regulating loop is capable of acting quickly and correctly under such unusual service conditions as slag dropping, the regulating speed and precision are improved, and accordingly the loop adaptability is improved.
Description
Technical field
The present invention relates to the technical field of power industry, particularly relate to a kind of hearth pressure control method.
Background technology
The main power source of current China is in thermal power plant, and burner hearth is as one of the capital equipment in thermal power plant, and its effect is that fuel can within it be burnt fully.And furnace pressure control is an important component part of thermal power plant combustion control system, furnace pressure whether stablize the security and economy that are directly connected to unit operation, so it is extremely important to the vacuum cavitations of burner hearth how to allow fuel burn fully.
Hearth vacuum control method of the prior art normally adopts unity loop control, air output feed-forward loop, in unity loop control mode, by adjustment boiler draft amount, ensures combustion chamber draft within the limits prescribed (micro-vacuum state); When boiler generation unusual service condition, as main fuel trip (Main Fuel Trip, MFT) time, furnace pressure will sharply change, so just pass through circuit feedback, then by the quick acting of Vanes on Induced Draft Fan by furnace pressure rapid adjustment to normal range (NR), thus reach the micro-vacuum state of regulation.
But inventor is realizing finding in process of the present invention, existing design furnace pressure sample point 6 place measuring point 15, wherein 3 cover samplings supply 3 analog quantitys respectively, and 3 cover samplings supply 3 groups of totally 12 switching values (the high three value protection switches of furnace pressure high two-value protection switch, furnace pressure, furnace pressure low two-value protection switch, each 3 of the low three value protection switches of furnace pressure); Because boiler front wall direction in prior art is furnished with 8 complete large pendant superheaters, substantially occupy the front wall space of upper furnace, the particularity of boiler structure determines to sample from left and right sides furnace wall; Boiler analog signals 3 sample points being designed for adjustment that dispatch from the factory at first are all arranged on the right side of burner hearth; 3 sample points, 12 switching values for the protection of signal are all arranged on the left of burner hearth, divide after getting 2 for 4 group 3 respectively as furnace pressure high two-value, high three values of furnace pressure, the low two-value of furnace pressure, low three value protections of furnace pressure.The drawback of such furnace pressure measuring point is, when burner hearth is one-sided fall Jiao or partial combustion worsen time, easily cause boiler main fuel trip action, this is the main cause of furnace pressure frequent movement.
And the disposal ability to abnormal conditions of existing unity loop control mode or not ideal enough, when such as there are falling the abnormal conditions such as Jiao, the reverse adjustment in air-supply loop when adding that negative pressure fluctuates, often cause the delayed and large deviation that negative pressure regulates, when severe especially, likely directly cause stove chamber fire-extinguishing.
Summary of the invention
In order to solve the problems referred to above that hearth pressure control method in prior art exists, the invention provides a kind of energy fast, the hearth pressure control method of stability contorting furnace pressure.
On the one hand, a kind of hearth pressure control method provided by the invention, described control method comprise to furnace pressure regulate a loop modulation module is set, it is characterized in that, described control method arranges unusual service condition identification loop before being also included in described loop modulation module, the control mode in described unusual service condition identification loop is: temporarily do not regulate when furnace pressure reduces fast, the quick adjustment when furnace pressure recovers and malleation raises; Wherein, described unusual service condition identification loop by connecting dead band module before described loop modulation module, and described dead band module parameter is greater than the absolute value at first quartile at the absolute value of third quadrant.
Preferably, the parameter of described dead band module is-1000pa and+200pa.
Preferably, described burner hearth comprises the front wall being provided with pendant superheater; Described unusual service condition identification loop comprise be arranged on described burner hearth front wall both sides be respectively arranged with two groups of sample points, often organize sample point and be respectively arranged with high two-value pressure switch, low two-value pressure switch, high three duty pressure switches, low three duty pressure switches; Three groups of protection switches are also respectively arranged with in affiliated burner hearth front wall both sides.
Preferably, described high two-value pressure switch, low two-value pressure switch action logic are for only having when respectively there is one group of relevant pressure switch motion described burner hearth front wall both sides, and protection switch just starts action; Described high three duty pressure switches, low three duty pressure switch motion logics are for when any one group of relevant pressure switch motion in described burner hearth front wall both sides, and protection switch just starts action.
Preferably, it is characterized in that, before described unusual service condition identification loop, be also in series with one order inertia module, after described unusual service condition identification loop, be also in series with constants block and multiplier module.
Preferably, it is characterized in that, under being also included in unusual service condition, locking pressure fan in short-term regulates.
On the other hand, the present invention also provides a kind of furnace pressure control system, comprises and arranges a loop modulation module to furnace pressure adjustment, arrange unusual service condition identification loop before described loop modulation module; Described unusual service condition identification loop comprise be arranged on described burner hearth front wall both sides be respectively arranged with two groups of sample points, often organize sample point and be respectively arranged with high two-value pressure switch, low two-value pressure switch, high three duty pressure switches, low three duty pressure switches; Three groups of protection switches are also respectively arranged with in affiliated burner hearth front wall both sides.
By increasing a unusual service condition identification loop in furnace pressure control loop, make negative pressure regulating loop to fall under the unusual service condition such as burnt can fast, correct operation, governing speed and degree of regulation are provided, and then improve loop adaptability.Further, under unusual service condition, locking pressure fan in short-term regulates, and air-supply regulating loop can be avoided the interference of negative pressure regulating loop, make negative pressure regulating loop energy fast and stable.
Accompanying drawing explanation
Figure 1 shows that the schematic diagram of a kind of negative pressure regulating loop that the embodiment of the present invention relates to;
Figure 2 shows that a kind of furnace pressure unusual service condition modular structure schematic diagram that the embodiment of the present invention relates to;
Figure 3 shows that the output model of a kind of negative pressure regulating loop of the prior art;
Figure 4 shows that the output model of a kind of negative pressure regulating loop related to for the embodiment of the present invention;
Figure 5 shows that the schematic diagram of a kind of regulating loop of blowing that the embodiment of the present invention relates to.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it should be noted that, these specific descriptions just allow those of ordinary skill in the art be more prone to, clearly understand the present invention, but not limitation of the invention is explained.
Embodiment
The present embodiment provides a kind of hearth pressure control method to comprise and arranges a loop modulation module to furnace pressure adjustment, this module is PID controller, control method arranges unusual service condition identification loop before being also included in loop modulation module, the control mode in unusual service condition identification loop is: temporarily do not regulate when furnace pressure reduces fast, the quick adjustment when furnace pressure recovers and malleation raises.Make negative pressure regulating loop to fall under the unusual service condition such as burnt can fast, correct operation, governing speed and degree of regulation are provided, and then improve loop adaptability.
As shown in Figure 1, preferably, sine-wave generator (Sine Wave) 1 is connected with successively in a kind of furnace pressure control system of simulation that the present embodiment provides; The multistage function module (Look-Up Table) 2 of connecting with sine-wave generator 1; First one order inertia module (Transfer Fcn1) 3; First dead band module (Dead Zone) 4; There is the pid control module 20 of the actual differential action (with Approximate Derivative), observation oscillograph 21; This control loop is the working control loop model simplified.
Preferably, second one order inertia module 5 one end is connected with the first one order inertia module 3, the other end connects in the input of the first dead band module 4 respectively, and the signal that the first one order inertia module 3 Output rusults and the second one order inertia module 5 result are got after poor (subtraction block 6) sends into the first one order inertia module 3.The result 5 that second one order inertia module exports simultaneously also exports the results added (addition module 7) of 4 afterwards as the input signal of next link with the first dead band module, add operation (addition module 14,15) is done with two parallel branches, two branch roads in parallel arrange respectively and are in series with dead band module 8,11, multiplier module 10,13, with dead band module 8,11 simultaneously as multiplier module is constants block 9,12.And then through twice multiplying (module 17,19), the constant of the constants block 16,18 of this twice multiplying is arranged to difference, is respectively 0.5,1.After twice multiplying, just signal is fed through pid control module 20.
Preferably, the first dead band module installation becomes parameter to be greater than the absolute value at first quartile at the absolute value of third quadrant; Parameter is before changed into-1000 ,+200 by ± 200; The effect that this parameter is brought can be introduced below in detail.
Fig. 3 and Fig. 4 is the simulation curve in Matlab software.Wherein, as shown in Figure 3, above a suite line be furnace pressure change curve and adjuster entrance aberration curve in prior art, below two suite lines be adjuster PID exporting change curve in prior art.Because of the Single Loop Control System that regulating system is traditional, pawning regulating system when Jiao causes furnace pressure significantly to reduce normal regulating can reduce output order; Export when furnace pressure recovers and significantly raises and also increase fast.Larger to disturb outward for falling Jiao Furnace pressure adjust system; and Furnace pressure adjust system is the controlled plant with self-balancing ability; if can suppose, combustion control system, Furnace pressure adjust system and blast regulation system all do not regulate when falling Jiao; when disturbance be not enough to trigger furnace pressure protection and System recover normal after, furnace pressure should be able to return to normal value voluntarily.Regulating system identification cannot fall burnt operating mode in real work, so along with furnace pressure reduces when falling Jiao, adjuster output order reduces; When pressure recover is to setting value, export actual instruction inevitable comparatively fall burnt before less than normal, just become large subsequently gradually, in fact the delayed regulating action of regulating system causes that the trough of furnace pressure curve is lower, crest is higher, and this is contradiction with the target regulated.Because regulating system is simple Single Loop Control System, do not possess the identification under burnt unusual service condition and adaptive ability, can only carry out override control or limit when other regulating systems are abnormal under the extreme conditions such as boiler extinguishment, this also just determines the limitation of its control characteristic.Analyze Yangcheng Power Plant all fall burnt operating mode curve form find; only otherwise occur falling burnt extreme operating condition on a large scale; major part fall burnt curve be all first negative after just; and due to coke button cooling generation steam and a small amount of fuel gas; malleation peak value is all greater than negative pressure peak, and this is also cause falling coke oven chamber pressure to be all one of reason of high two-value protection switch action tripping operation in regulating system actual moving process at every turn.As long as Furnace pressure adjust system ensures temporarily not regulate when falling coke oven chamber pressure and reducing fast; the quick adjustment when furnace pressure recovers and malleation raises; namely the peak value that just effectively can reduce furnace pressure reaches peak clipping effect; effectively can avoid the probability of trigger protection; reduce unplanned outage, do not affect normal regulatory function again simultaneously.
Fig. 4 is the output model of a kind of negative pressure regulating loop that the present embodiment relates to; A suite line is furnace pressure change curve and adjuster entrance aberration curve in the present embodiment above, below two suite lines be that in the present embodiment, burner hearth control system optimizes post regulator PID exporting change curve.
The curve form that inventor is analyzing burnt operating mode finds, only otherwise occur falling burnt extreme operating condition on a large scale, major part fall burnt curve be all after first bearing just, and malleation peak value is all greater than negative pressure peak.As long as Furnace pressure adjust system ensures temporarily not regulate when falling coke oven chamber pressure and reducing fast, the quick adjustment when furnace pressure recovers and malleation raises, just effectively can reduce the peak value of furnace pressure, so just can effectively avoid the probability of trigger protection to reduce non-stopping; Can try one's best under the prerequisite not changing original control thought and logic basic structure like this and reach target through minimum change.
Adopt the control method after optimizing, can obtain test result (simulation curve that Fig. 4 plants) according to the schematic diagram of Fig. 1 is: the deviation of simulation disturbance under same amplitude, optimize post regulator performance boost, governing speed and amplitude when furnace pressure bust limit, then can quick adjustment when furnace pressure jumps, this will the adaptability of significant increase regulating system when falling Jiao, reduces the probability that furnace pressure fluctuation triggers MFT action.Simulated test shows, when pressure reduces fast, adjuster instruction obviously reduces slowly, and instruction change amplitude reduces about 40%.When pressure raises fast, adjuster instruction still can become large fast and obviously shift to an earlier date in the starting stage, and commanded amplitude increases about 15%.Meanwhile, the furnace pressure more original speed of adjuster output order and amplitude when normal range (NR) fuctuation within a narrow range slightly increase, and consider the dead band of PID dead band and actuator, substantially little on the impact of regulating system.
When furnace pressure significantly changes, because the change of fan resistance coefficient will cause the change of air output measured value, air output regulating loop relative furnace pressure regulating loop corresponding speed is very fast, and this can cause the action under furnace pressure disturbance of air-supply regulating loop.When furnace pressure reduces, windage reduction air flow rate will become greatly, and blast regulator output order reduces the range of decrease that this can increase furnace pressure to a certain extent; When furnace pressure raises, windage rising air output diminishes, blast regulator output order increases, this can increase again the amount of increase of furnace pressure to a certain extent, this is the equal of serve humidification to furnace pressure fluctuation, and instruction feedforward of simultaneously blowing also creates adverse effect to Furnace pressure adjust system.According to the curve statement analysis falling burnt operating mode, when there is the furnace pressure fluctuation of about 1000Pa, the reverse undulating value of at least 15 ~ 20m/s will be there is immediately in air output measured value, the pressure fan movable vane amplitude of accommodation can reach 2% ~ 3%, air output regulating loop is as air quantity disturbance when None-identified falls Jiao as can be seen here, will obviously affect furnace pressure adjusting function
By increasing corresponding restrictive condition to air output regulating loop logic, make the change of its energy locking air quantity difference signal when furnace pressure acute variation, when furnace pressure fluctuates, air-supply temporarily exits regulatory function like this, and still can regulate according to actual air volume after furnace pressure returns to normal range (NR), namely avoid unusual service condition lower hearth pressure to the interference of air measuring value.
Specific implementation as shown in Figure 2, preferably, the input signal of air-supply regulating loop comprises the input signal 101 under normal condition (Normal), (such as unit is called " RUN BACK/ is called for short RB " in automatic processing capacity with abnormal input signal, or main fuel trip/MFT) 102, input signal 101 under normal circumstances and abnormal input signal 102 are connected in parallel to selector switch 103, and selector switch 103 outputs signal through-1 constant (constants block 104) in multiplier module 105 negate.Input signal also has furnace pressure measured value module (PRESS) 109, after one order inertia module 110, difference (subtraction block 111) is got with the signal of two kinds of signals after multiplier module 105 above, again after constants block 112 and multiplier module 114, get minimum of a value (comparison module 116) with constants block 113.
As shown in Figure 5, furnace pressure measured value module (PRESS) 109 also outputs signal with selector switch 103 and goes to get difference by subtraction block 106 after one order inertia module 110, then by after constants block 107 and multiplier module 108, get maximum (comparison module 117) with constants block 115 again, and then get minimum of a value (comparison module 119) with air quantity difference signal (Air demand DEV); The signal got between the signal that last comparison module 116 exports and the module that comparison module 119 exports after maxima operation (comparison module 120) is signal of blowing.When achieving negative pressure signal exception by 116 and 117 two size modeling blocks, air quantity restricting signal switches to abnormal obliteration by normal monitoring.118 air quantity difference signals are achieving locking adjustment under unusual service condition through 116 and 117 two outputs after positive negative sense locking.
Preferably, under above-mentioned hearth pressure control method is also included in unusual service condition, locking pressure fan in short-term regulates.By increasing a unusual service condition identification loop further in furnace pressure control loop, under unusual service condition, locking pressure fan in short-term regulates, and air-supply regulating loop can be avoided the interference of negative pressure regulating loop, make negative pressure regulating loop energy fast and stable.
Finally it should be noted that, above-mentioned explanation is only most preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Any those of ordinary skill in the art; do not departing within the scope of technical solution of the present invention; the way of above-mentioned announcement and technology contents all can be utilized to make many possible variations and simple replacement etc. to technical solution of the present invention, and these all belong to the scope of technical solution of the present invention protection.
Claims (7)
1. a hearth pressure control method, described control method comprise to furnace pressure regulate a loop modulation module is set, it is characterized in that, described control method arranges unusual service condition identification loop before being also included in described loop modulation module, the control mode in described unusual service condition identification loop is: temporarily do not regulate when furnace pressure reduces fast, the quick adjustment when furnace pressure recovers and malleation raises; Wherein, described unusual service condition identification loop by connecting dead band module before described loop modulation module, and described dead band module parameter is greater than the absolute value at first quartile at the absolute value of third quadrant.
2. hearth pressure control method as claimed in claim 1, is characterized in that, the parameter of described dead band module is-1000pa and+200pa.
3. hearth pressure control method as claimed in claim 1, it is characterized in that, described burner hearth comprises the front wall being provided with pendant superheater; Described unusual service condition identification loop comprise be arranged on described burner hearth front wall both sides be respectively arranged with two groups of sample points, often organize sample point and be respectively arranged with high two-value pressure switch, low two-value pressure switch, high three duty pressure switches, low three duty pressure switches; Three groups of protection switches are also respectively arranged with in affiliated burner hearth front wall both sides.
4. as claim 3 hearth pressure control method, it is characterized in that, described high two-value pressure switch, low two-value pressure switch action logic are for only having when respectively there is one group of relevant pressure switch motion described burner hearth front wall both sides, and protection switch just starts action; Described high three duty pressure switches, low three duty pressure switch motion logics are for when any one group of relevant pressure switch motion in described burner hearth front wall both sides, and protection switch just starts action.
5. hearth pressure control method as claimed in claim 1, is characterized in that, before described unusual service condition identification loop, be also in series with one order inertia module, after described unusual service condition identification loop, be also in series with constants block and multiplier module.
6. hearth pressure control method as claimed in claim 1, is characterized in that, under being also included in unusual service condition, locking pressure fan in short-term regulates.
7. a furnace pressure control system, Qi Tete is, comprises and arranges a loop modulation module to furnace pressure adjustment, arrange unusual service condition identification loop before described loop modulation module; Described unusual service condition identification loop comprise be arranged on described burner hearth front wall both sides be respectively arranged with two groups of sample points, often organize sample point and be respectively arranged with high two-value pressure switch, low two-value pressure switch, high three duty pressure switches, low three duty pressure switches; Three groups of protection switches are also respectively arranged with in affiliated burner hearth front wall both sides.
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Cited By (4)
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| CN105135411A (en) * | 2015-08-21 | 2015-12-09 | 国网山东省电力公司电力科学研究院 | Adjusting system and method for preventing fire extinguishing caused by pressure jump of dry bottom hopper of coal-fired boiler |
| CN105180138A (en) * | 2015-10-26 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Control method and system for power station boiler air and flue gas system |
| CN107940501A (en) * | 2017-11-30 | 2018-04-20 | 国网辽宁省电力有限公司电力科学研究院 | Air and flue system control optimization method after the transformation of fired power generating unit desulphurization denitration |
| CN109116725A (en) * | 2018-08-23 | 2019-01-01 | 广东电网有限责任公司 | A kind of method and apparatus of high accuracy approximation purely retarded |
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| CN105180138A (en) * | 2015-10-26 | 2015-12-23 | 广东电网有限责任公司电力科学研究院 | Control method and system for power station boiler air and flue gas system |
| CN107940501A (en) * | 2017-11-30 | 2018-04-20 | 国网辽宁省电力有限公司电力科学研究院 | Air and flue system control optimization method after the transformation of fired power generating unit desulphurization denitration |
| CN109116725A (en) * | 2018-08-23 | 2019-01-01 | 广东电网有限责任公司 | A kind of method and apparatus of high accuracy approximation purely retarded |
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Application publication date: 20150121 |