CN102063058A - Fuel calorific value correction method and system - Google Patents
Fuel calorific value correction method and system Download PDFInfo
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- CN102063058A CN102063058A CN 201010586755 CN201010586755A CN102063058A CN 102063058 A CN102063058 A CN 102063058A CN 201010586755 CN201010586755 CN 201010586755 CN 201010586755 A CN201010586755 A CN 201010586755A CN 102063058 A CN102063058 A CN 102063058A
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Abstract
The invention discloses a fuel calorific value correction method and system, wherein the method comprises the following steps: correcting the total fuel flow with a first fuel calorific value correction coefficient to obtain the corrected fuel quantity; calculating a reference fuel quantity according to actual unit load; calculating a second fuel calorific value correction coefficient according to the reference fuel quantity and corrected fuel quantity; determining an automatic fuel calorific value correction coefficient according to the calorific value correction coefficient maintaining conditions; and updating the first fuel calorific value correction coefficient with the automatic fuel calorific value correction coefficient or a manually given third fuel calorific value correction coefficient in a manual-automatic switching state. By utilizing the scheme of the invention, the fuel calorific value correction coefficient is updated in real time according to the real-time load condition, the corrected fuel quantity and the calorific value correction coefficient maintaining conditions, and real-time correction of the fuel calorific value is realized; the fuel calorific value correction method and system disclosed by the invention can be used for correcting the calorific value of the input fuel quantity of boilers with various fuel varieties and pressure levels; and the adaptability of a unit control system to various fuel varieties and the stability of the control system are effectively improved.
Description
Technical field
The present invention relates to the bearing calibration of a kind of power plant boiler fuel value and a kind of fuel value corrective system.
Background technology
Along with the demand of thermal power plant's fuel for power generation is increasing, imbalance between supply and demand becomes increasingly conspicuous, and the design fuel of generating plant can't be guaranteed supply, in order to make power plant can continue generating, many power plant are the conversion fuel band continually, and along with the variation of fuel band, the calorific value of unit of fuel also changes thereupon.Yet, thermal power plant's turbine-boiler coordinated control system, combustion control system, air supply control system, the adjusting parameter of feed water control system (direct current stove unit), adjusting of characteristic function all is that fuel band according to specific is adjusted, in case changed fuel band, the unit of fuel calorific value also can change, thereby make the total blast volume that enters boiler, fuel quantity, the actual proportioning of feedwater flow changes, if still adopt the control system parameter of adjusting to move by the special fuel kind, unit load, main vapour pressure, main stripping temperature, reheat steam temperature, the regulation quality of regulated variables such as flue gas oxygen content will variation, even can make control system can't drop into automatic operation.In order to improve the adaptability of control system to fuel band, improve the regulation quality of system, be necessary the fuel value that enters boiler is carried out on-line correction.
At present, the calorific value correcting mode that adopts in the power plant mainly contains three kinds: heat signal is proofreaied and correct, and steam enthalpy is proofreaied and correct, and adopts the positive and negative equilibrium relation of heat output of fuel to calculate, obtain the relative variation of heat output of fuel, remove to revise the fuel quantity that enters boiler with this variable quantity again.The heat signal correcting mode need be used the drum pressure signal, but there is no this signal in the direct current cooker; The steam enthalpy correcting mode need use the steam enthalpy computing module, but part scattered control system (DCS) does not provide this module at present; Chinese patent CN02110116.7 discloses the positive and negative thermal equilibrium of a kind of employing and has carried out the fuel value Calculation Method, but the parameter that is applied to is numerous, and calculation of complex is difficult to apply in DCS.
Summary of the invention
At above-mentioned problems of the prior art, the object of the present invention is to provide a kind of fuel value bearing calibration and a kind of fuel value corrective system, its boiler applicable to the various fuel of burning, various pressure ratings carries out calorific value to the fuel quantity of importing to be proofreaied and correct, and effectively improves unit control system to the adaptability of various fuel bands and the stability of control system.
For achieving the above object, the present invention by the following technical solutions:
A kind of fuel value bearing calibration comprises step:
Adopt the total fuel flow amount before the first fuel value correction coefficient is proofreaied and correct calorific value to proofread and correct, obtain fuel quantity after the correction after calorific value is proofreaied and correct;
Unit load according to reality calculates the equivalent fuel amount;
Described equivalent fuel amount and described correction back fuel quantity are compared, calculate the second fuel value correction coefficient by continuous PID computing;
Determine calorific value correction coefficient conservation condition according to unit load scope, unit load actual rate, fuel quantity rate of change and feedwater flow rate of change;
According to described calorific value correction coefficient conservation condition, determine automatic fuel calorific value correction coefficient, this automatic fuel calorific value correction coefficient is described first fuel value correction coefficient or the described second fuel value correction coefficient;
By the hand automatic controller, adopt the 3rd fuel value correction coefficient of manual setting or the described automatic fuel calorific value correction coefficient of automatic reception to upgrade the described first fuel value correction coefficient.
A kind of fuel value corrective system comprises:
Fuel quantity calorific value corrective loop unit is used to adopt the total fuel flow amount before the first fuel value correction coefficient is proofreaied and correct calorific value to proofread and correct, and obtains fuel quantity after the correction after calorific value is proofreaied and correct;
Equivalent fuel amount counter circuit unit is used for calculating the equivalent fuel amount according to the unit load of reality;
Calorific value is proofreaied and correct control module, is used for described equivalent fuel amount and described correction back fuel quantity are compared, and calculates the second fuel value correction coefficient;
Follow the tracks of maintenance and judge circuit units, be used for determining calorific value correction coefficient conservation condition according to unit load scope, unit load actual rate, fuel quantity rate of change and feedwater flow rate of change;
Switch unit is used for determining automatic fuel calorific value correction coefficient according to described calorific value correction coefficient conservation condition that this automatic fuel calorific value correction coefficient is described first fuel value correction coefficient or the described second fuel value correction coefficient;
The automatic operating unit of hand, be used for manual setting or automatic reception the 3rd fuel value correction coefficient, by the hand automatic switching function, adopt the described automatic fuel calorific value correction coefficient of described the 3rd fuel value correction coefficient or automatic reception to upgrade the described first fuel value correction coefficient, and the first fuel value correction coefficient after will upgrading export described fuel quantity calorific value corrective loop unit to.
Scheme according to the invention described above, its be with the special fuel kind or the design fuel band be benchmark, correction enters the fuel flow rate of boiler, and according to real-time load condition, the correction fuel amount, and in conjunction with calorific value correction coefficient conservation condition real-time update fuel value correction coefficient, realization is to the real-time correction of fuel value, this fuel value correcting mode, irrelevant with the fuel band that adopts, therefore applicable to the various kinds of burning, the boiler of various pressure ratings carries out the calorific value correction to the fuel quantity of input, has improved unit control system effectively to the adaptability of various fuel bands and the stability of control system.
Description of drawings
Fig. 1 is the schematic flow sheet of fuel value bearing calibration embodiment of the present invention;
Fig. 2 is the structural representation of fuel value corrective system embodiment of the present invention;
Fig. 3 is the signal processing flow synoptic diagram according to fuel value bearing calibration of the present invention;
Fig. 4 is the theory structure synoptic diagram according to the specific embodiment of fuel value corrective system of the present invention.
Embodiment
Below in the mode of specific embodiment the present invention program is elaborated.
As shown in Figure 1, be the schematic flow sheet of fuel value bearing calibration embodiment of the present invention, it comprises step:
Step S101: adopt the total fuel flow amount before the first fuel value correction coefficient is proofreaied and correct calorific value to proofread and correct, fuel quantity after the correction after obtaining calorific value and proofreading and correct, this correction back fuel quantity can directly adopt the mode that the total fuel flow amount before the first fuel value correction coefficient and the calorific value correction is multiplied each other to obtain, and enters step S102;
Step S102: determine the equivalent fuel amount according to the unit load of reality, enter step S103;
Step S103: described equivalent fuel amount and described correction back fuel quantity are compared, calculate the second fuel value correction coefficient, enter step S104 by continuous PID computing;
Step S104: determine calorific value correction coefficient conservation condition according to unit load scope, unit load rate of change, fuel quantity rate of change and feedwater flow rate of change, enter step S105;
Step S105: according to described calorific value correction coefficient conservation condition, determine automatic fuel calorific value correction coefficient, this automatic fuel calorific value correction coefficient is described first fuel value correction coefficient or the described second fuel value correction coefficient, enters step S106;
Step S106:, adopt the 3rd fuel value correction coefficient of manual setting or the described automatic fuel calorific value correction coefficient of automatic reception to upgrade the described first fuel value correction coefficient by the hand automatic controller.
According to the inventive method, it is after adopting the first fuel value correction coefficient that the total fuel quantity before proofreading and correct is proofreaied and correct, again according to proofreading and correct the back fuel quantity, unit load, calorific value correction coefficient conservation condition and hand automatic switchover state come this first fuel value correction coefficient is upgraded in real time, and finish follow-up fuel value trimming process with the first fuel value correction coefficient after upgrading, this fuel value correcting mode, applicable to the various fuel of burning, the boiler of various pressure ratings carries out the calorific value correction to the fuel quantity of input, it can effectively be proofreaied and correct fuel value in the set steady industrial and mineral, can effectively overcome the interference effect of fuel value trimming process again, improve unit control system effectively the adaptability of various fuel bands and the stability of control system to the unit lifting load.
Wherein, the computation process of proofreading and correct after-burning material amount, equivalent fuel amount in the above-mentioned steps can be not adopt above-mentioned sequencing, can carry out simultaneously.Correspondingly, the process of the aforementioned calculation second fuel value correction coefficient and definite calorific value correction coefficient conservation condition also can be not according to said sequence, can carry out simultaneously.
Below each step in the invention described above method is elaborated.
When above-mentioned unit load according to reality is determined the equivalent fuel amount, because the input value of unit load is a basic input parameters in the fired power generating unit control system, therefore can directly quote in the methods of the invention, when calculating the equivalent fuel amount, the relation of " unit load--equivalent fuel amount " in the performance computation book that can provide according to boiler producer is searched and is obtained, also can be according to the pairing load of load up process that unit is complete when the boiler fuel kind is constant--and the fuel flow rate relation is determined.According to actual needs, also can adopt other mode to be determined.
By to above-mentioned equivalent fuel amount with proofread and correct the back fuel quantity and compare, and this difference is carried out continuous proportional-integral-differential (being called for short PID) computing, can calculate the aforementioned calculation second fuel value correction coefficient.In the preferred case, also can be the calculating process that only carries out the integral correction effect.
When judging above-mentioned fuel value coefficient conservation condition, the unit load of required application, fuel quantity, feedwater flow etc. are the basic parameters in the fired power generating unit, can directly quote; The unit load scope can be defined as unit and not throw the minimum steady combustion of oil and load to the load range of unit between at full capacity, and unit load actual rate, fuel quantity rate of change, feedwater flow rate of change can monitor or differentiate and obtain by unit load, fuel quantity, feedwater flow etc. being carried out speed.
When unit load is lower than the minimum steady combustion load of not throwing oil, promptly be lower than carry out that automatic calorific value proofreaies and correct desired unit load scope following in limited time, the fuel that enters boiler may comprise multiple compositions such as oil, coal, at this moment the fuel value correction coefficient needs to keep, and judges and satisfies fuel value coefficient conservation condition.In addition, when unit is in when changing operating mode: comprise when in unit load actual rate, fuel quantity rate of change, the feedwater flow rate of change etc. any one is higher than its corresponding predetermined value, for example, installed capacity be the unit load of 600MW less than 240MW, actual load rate of change greater than 6MW/min, the fuel flow rate rate of change greater than 2t/h/min, feedwater flow rate of change greater than 20t/h/min, fuel value is proofreaied and correct also to be needed to keep, and is judged to be and satisfies fuel value coefficient conservation condition.
Under the situation that satisfies calorific value correction coefficient conservation condition, then explanation needs to continue to use the first original fuel value correction coefficient to come fuel value is proofreaied and correct, and therefore adopts the described first fuel value correction coefficient as described automatic fuel calorific value correction coefficient; After calorific value is proofreaied and correct input auto state and calorific value correction coefficient conservation condition disappearance Preset Time section, then adopt the described second fuel value correction coefficient as described automatic fuel calorific value correction coefficient.
Come the above-mentioned first fuel value correction coefficient is operated renewal by hand automatic switchover state subsequently, if proofreading and correct, calorific value drops into auto state, then adopt above-mentioned definite automatic fuel calorific value correction coefficient to upgrade the above-mentioned first fuel value correction coefficient, and realize correction fuel value with the first fuel value correction coefficient after upgrading; If switched to manual state, then adopt the user manually to import fuel value correction coefficient (being referred to as the 3rd fuel value correction coefficient) and upgrade the above-mentioned first fuel value correction coefficient, and with the correction of the first fuel value correction coefficient realization after upgrading to fuel value.
According to the fuel value bearing calibration of the invention described above, its corresponding signal process schematic flow sheet as shown in Figure 3, according to this signal processing flow synoptic diagram as seen, the inventive method has realized the real-time update to the fuel value correction coefficient.
As shown in Figure 2, be the structural representation of fuel value corrective system embodiment of the present invention, it specifically comprises:
Fuel quantity calorific value corrective loop unit 201 is used to adopt the total fuel flow amount before the first fuel value correction coefficient is proofreaied and correct calorific value to proofread and correct, and obtains fuel quantity after the correction after calorific value is proofreaied and correct;
Equivalent fuel amount counter circuit unit 202 is used for determining the equivalent fuel amount according to the unit load of reality;
Calorific value is proofreaied and correct control module 203, is used for described equivalent fuel amount and described correction back fuel quantity are compared, and calculates the second fuel value correction coefficient;
Follow the tracks of maintenance and judge circuit units 204, be used for determining calorific value correction coefficient conservation condition according to unit load scope, unit load actual rate, fuel quantity rate of change and feedwater flow rate of change;
The automatic operating unit of hand (MA) 206, be used to receive the 3rd fuel value correction coefficient of manual setting, by the hand automatic switching function, adopt the described automatic fuel calorific value correction coefficient of described the 3rd fuel value correction coefficient or automatic reception to upgrade the described first fuel value correction coefficient, and the first fuel value correction coefficient after will upgrading export described fuel quantity calorific value corrective loop unit 201 to.
According to fuel value corrective system of the present invention, it is after adopting the first fuel value correction coefficient that the total fuel quantity before proofreading and correct is proofreaied and correct, again according to proofreading and correct the back fuel quantity, unit load, calorific value correction coefficient conservation condition and hand automatic switchover state come this first fuel value correction coefficient is upgraded in real time, and finish follow-up fuel value trimming process with the first fuel value correction coefficient after upgrading, this fuel value correcting mode, applicable to the various fuel of burning, the boiler of various pressure ratings carries out the calorific value correction to the fuel quantity of input, it can effectively be proofreaied and correct fuel value in the set steady industrial and mineral, can effectively overcome the interference effect of fuel value trimming process again, improve unit control system effectively the adaptability of various fuel bands and the stability of control system to the unit lifting load.
Fuel value corrective system according to the invention described above, Fig. 4 is the theory structure synoptic diagram according to the specific embodiment of fuel value corrective system of the present invention, below with the theory structure synoptic diagram shown in Fig. 4 fuel value corrective system of the present invention is elaborated.
As shown in Figure 4, equivalent fuel amount counter circuit unit 202 among the present invention program can comprise the first inertia processing unit 11 and load fuel function unit 12, wherein the first inertia processing unit 11 inserts the unit load signal, be used for that the unit load signal is carried out inertia and handle, to eliminate or to weaken the high-frequency fluctuation of input signal; The input end of load fuel function unit 12 is connected with the output terminal of the first inertia processing unit 11, and output terminal is connected with the input end that above-mentioned calorific value is proofreaied and correct control module 203, is used for calculating the equivalent fuel amount of determining according to the unit load after the described inertia processing.
When definite equivalent fuel amount,, therefore can directly quote because the input value of unit load is a basic input parameters in the fired power generating unit control system.And the calculating of equivalent fuel amount, then the relation of " unit load--the equivalent fuel amount " in the performance computation book that can provide according to boiler producer is searched and is obtained, also can according to unit when the boiler fuel kind is constant from set grid-connection to pairing load of complete load up process of band fully loaded--the fuel flow rate relation is determined.According to actual needs, also can adopt other mode to be determined.
By to above-mentioned equivalent fuel amount with proofread and correct the back fuel quantity and compare, and this difference is carried out continuous proportional-integral-differential (being called for short PID) computing, can calculate the aforementioned calculation second fuel value correction coefficient.In the preferred case, also can be the calculating process that only carries out the integral correction effect.
As shown in Figure 4, in this concrete example, above-mentioned fuel quantity calorific value corrective loop unit 201 comprises the second inertia processing unit 31, multiplication unit 32, the input end of the second inertia processing unit 31 inserts the total fuel flow amount signal before calorific value is proofreaied and correct, being used for that total fuel flow amount signal is carried out inertia handles, the input end of multiplication unit 32 is connected with the output terminal of the second inertia processing unit 31 and the correction coefficient output terminal of the automatic operating unit 206 of hand, output terminal is connected with the input end that calorific value is proofreaied and correct control module 203, being used for that described calorific value is proofreaied and correct preceding total fuel flow amount proofreaies and correct, fuel quantity behind the output calibration is proofreaied and correct the back fuel quantity and can directly be adopted the mode that the total fuel flow amount before the first fuel value correction coefficient and the calorific value correction is multiplied each other to obtain.
As shown in Figure 4, above-mentioned tracking keeps judging that circuit units 204 comprises: load lower bound monitor unit 41, load rate monitor unit 42, fuel quantity speed monitor unit 43, main steam flow amount speed monitor unit 44, feedwater flow speed monitor unit 45, first or the disconnected unit of door 46, time-delay 47, second or door 48, wherein:
Load lower bound monitor unit 41, the input end of load rate monitor unit 42 inserts the unit load signal, the input end of fuel quantity speed monitor unit 43 inserts fuel flow signal, the input end of main steam flow amount speed monitor unit 44 inserts main steam flow amount signal, the input end of feedwater flow speed monitor unit 45 inserts the feedwater flow signal, load lower bound monitor unit 41, load rate monitor unit 42, fuel quantity speed monitor unit 43, main steam flow amount speed monitor unit 44, the output terminal of feedwater flow speed monitor unit 45 all is connected with first or door 46 input end, first or the break input end of unit 47 of door 46 output terminal and time-delay be connected, the output terminal of the disconnected unit 47 of time-delay is connected with second or 48 input end, second or door another input end of 48 be connected with the hand auto state output terminal of the automatic operating unit 206 of hand, second or 48 output terminal is connected with the input end of switch unit 205.
When above-mentioned load lower bound monitor unit 41, load rate monitor unit 42, in fuel quantity speed monitor unit 43, main steam flow amount speed monitor unit 44, the feedwater flow speed monitor unit 45 any one is output as very, for example, rated capacity be the unit load of 600MW less than 240MW, actual load rate of change greater than 6MW/min, fuel flow rate rate of change greater than 2t/h/min, feedwater flow rate of change greater than 20t/h/min, and calorific value is proofreaied and correct and is in auto state, then sends calorific value and proofreaies and correct holding signal.After all guard conditions disappear, still keep a period of time, for example 300 seconds, enter steady state (SS) to guarantee relevant each parameter, and then carry out the process that calorific value is proofreaied and correct.When the calorific value correction was in manual state, calorific value was proofreaied and correct and is entered tracking mode immediately.
Wherein, above-mentioned second or door 48 output terminal be connected with the tracking input end that calorific value is proofreaied and correct PID controller 21 (being that calorific value is proofreaied and correct control module), the while is connected with the tracking input end of the automatic operating unit 61 of hand.
With the theory structure synoptic diagram shown in Fig. 4 is example, in a concrete fuel value trimming process:
Total fuel quantity before proofreading and correct enters the second inertia processing unit 31 and carries out the inertia processing, to eliminate or to weaken the high-frequency fluctuation of input signal, signal after inertia is handled enters multiplication unit 32, after the first fuel value correction coefficient that signal after multiplication unit 32 is handled this inertia and the automatic operating unit 61 of hand send multiplies each other, obtain proofreading and correct the back fuel quantity.Proofread and correct the back fuel quantity and can directly supply with follow-up use, proofread and correct the back fuel quantity and also input to calorific value correction control module 21 simultaneously.
The unit load signal inputs to the first inertia processing unit 11 and carries out the inertia processing, to eliminate or to weaken the high-frequency fluctuation of input signal, signal after inertia is handled enters load fuel function unit 12, load fuel function unit 12 is determined corresponding equivalent fuel amount according to unit load, and the equivalent fuel amount after determining inputs to calorific value and proofreaies and correct control module 21.
The equivalent fuel amount of fuel quantity, 12 outputs of load fuel function unit after the correction of calorific value correction control module 21 reception multiplication units 32 outputs, determine the second fuel value correction coefficient according to fuel quantity, the calculating of equivalent fuel amount after proofreading and correct, and will calculate the second fuel value correction coefficient of determining and export to switch unit 51.
The unit load signal inputs to load lower bound monitor unit 41 simultaneously, the value of 41 pairs of unit loads of load lower bound monitor unit is judged, when being lower than the following of unit load scope, unit load prescribes a time limit, for example single-machine capacity is that the unit load of 600MW is lower than 240MW, load lower bound monitor unit 41 output true signals, output 1 gives first or door 46, otherwise the output glitch, and output 0 gives first or door 46.
The unit load signal inputs to load rate monitor unit 42 simultaneously, the rate of change of 42 pairs of unit loads of load rate monitor unit monitors, when the rate of change of unit load is higher than its corresponding setting value, for example greater than 6MW/min, load rate monitor unit 42 output true signals, output 1 gives first or door 46, otherwise the output glitch, and output 0 gives first or door 46.
The signal of fuel flow rate enters fuel quantity speed monitor unit 43, the rate of change of 43 pairs of fuel flow rates of fuel quantity speed monitor unit monitors, when the rate of change of fuel flow rate is higher than its corresponding setting value, 2t/h/min for example, fuel quantity speed monitor unit 43 output true signals, output 1 gives first or door 46, otherwise the output glitch, and output 0 gives first or door 46.
The signal of main steam flow amount enters main steam flow amount speed monitor unit 44, the rate of change of 44 pairs of main steam flow amounts of main steam flow amount speed monitor unit monitors, when the rate of change of main steam flow amount is higher than its corresponding setting value, main steam flow amount speed monitor unit 44 output true signals, output 1 gives first or door 46, otherwise output glitch, output 0 give first or door 46.
The signal of feedwater flow enters feedwater flow speed monitor unit 45, the rate of change of 45 pairs of feedwater flows of feedwater flow speed monitor unit monitors, when the rate of change of giving feedwater flow is higher than its corresponding setting value, feedwater flow speed monitor unit 45 output true signals, output 1 gives first or door 46, otherwise output glitch, output 0 give first or door 46.
When any one the output true signal in load lower bound monitor unit 41, load rate monitor unit 42, fuel quantity speed monitor unit 43, main steam flow amount speed monitor unit 44, the feedwater flow speed monitor unit 45, first or door 46 output true signals give time-delay disconnected unit 47, behind the disconnected unit 47 of delaying time, enter second or door 48.
Simultaneously, the output signal of the hand auto state output terminal of the automatic operating unit 61 of hand export to second or the door 48, if be in manual state, then the automatic operating unit of hand 61 output true signals 1 give second or door 48, if be in auto state, then the automatic operating unit 61 output glitches 0 of hand give second or door 48.
Second or door 48 receive any one true signal, then calorific value coefficient conservation condition is satisfied in explanation, and the true signal 1 that will satisfy calorific value coefficient conservation condition outputs to switch unit 51.
Switch unit 51 receives second or the true signals 1 that satisfy calorific value coefficient conservation condition that send of door 48, explanation need keep the first current fuel value correction coefficient, and the first fuel value correction coefficient of automatic operating unit 61 outputs of hand returns to the automatic operating unit 61 of hand by " Y " input section of switch unit 51.
If second or door 48 do not receive any one true signal, then calorific value coefficient conservation condition is not satisfied in explanation, the automatic fuel calorific value correction coefficient of switch unit 51 outputs equals the output valve that calorific value is proofreaied and correct control module 21, promptly equals calorific value and proofreaies and correct the second fuel value correction coefficient that control module 21 calculates.
Switch unit 51 receives second or the glitches 0 that do not satisfy calorific value coefficient conservation condition that send of door 48, explanation need change the first current fuel value correction coefficient, then calorific value being proofreaied and correct control module 21 carries the second fuel value correction coefficient of coming by automatic operating unit 61 outputs of hand, as the first fuel value correction coefficient.
The automatic operating unit 61 of hand receives the automatic fuel calorific value correction coefficient that switch unit 51 sends over, be under the auto state, the automatic fuel calorific value correction coefficient that switch unit 51 sends over is exported as the first fuel value correction coefficient, and carried out the correction of fuel value for multiplication unit 32.The automatic operating unit 61 of hand is under the manual state, with the manual setting first fuel value correction coefficient, and exports to multiplication unit 32 and carries out the correction of fuel value.
In addition, the first fuel value correction coefficient of the automatic operating unit 61 of hand is also exported to the tracking amount input end that above-mentioned calorific value is proofreaied and correct control module 21, " Y " input end of switch unit 51, the manual state output terminal of the automatic operating unit 61 of hand also is connected to second or door 48 input end, proofread and correct control module 21 and switch unit 51 at the situation that the satisfies calorific value correction coefficient conservation condition calorific value that sends a notice, make calorific value proofread and correct the output valve of control module 21, the output valve of the automatic fuel calorific value correction coefficient of switch unit 51 outputs equals the current first calorific value correction coefficient of using, proofread and correct control module 21 at the situation that does not the satisfy calorific value correction coefficient conservation condition calorific value that sends a notice, switch unit 51 makes calorific value proofread and correct the second fuel value correction coefficient of control module 21 outputs, the output valve of the automatic fuel correction coefficient of switch unit 51 outputs equals calorific value and proofreaies and correct the second fuel value correction coefficient that the P-I-D computing of control module 21 obtains exporting.
Below to proofread and correct specific implementation with a calorific value that is applied to the 600MW fired power generating unit be example, just parameter setting wherein etc. is elaborated.
As mentioned above, when determining the equivalent fuel amount, suppose unit load according to unit load---being set as follows shown in the table, so of the relation of equivalent fuel amount, when determining the equivalent fuel amount, can obtain corresponding equivalent fuel amount by searching following table according to unit load.
| Load (MW) | 240.0 | 270.0 | 303.0 | 352.0 | 403.0 | 453.0 | 504.0 | 543.0 | 600.0 | 650.0 |
| Equivalent fuel amount (t/h) | 93.2 | 102.9 | 115.3 | 132.3 | 148.7 | 165.9 | 182.8 | 198.6 | 219.5 | 225.5 |
In wherein a kind of implementation of the above-mentioned first inertia processing unit 11, the second inertia processing unit 31, its parametric description can be done following setting:
| Token name | Data type | Default value | Describe |
| Output Y | Float | 0.0 | Inertia is handled back output |
| Input X | Float | 0.0 | The pointer of representing in the B.I mode, or floating number immediately |
| Input TR | Float | Null | The pointer of representing in the B.I mode, or floating number immediately.Tracked amount, sky |
| Pin is not always followed the tracks of. | |||
| Input TS | Bool | F | The pointer of representing in the B.I mode, or Bolean number immediately.Follow the tracks of change-over switch |
| Parameter H | Float | 100.0 | The high limit of output |
| Parameter L | Float | 0.0 | The output lower bound |
| Parameter L G | float | 1.0 | Inertia time constant, LG must be more than or equal to 1/2T (sampling period) |
| Parameter GN | float | 1.0 | Gain G N |
Correspondingly, in a concrete program example, its program implementation can be:
if(TS＝1){Y(n)＝TR(n)*GN；}
else{K1＝GN/(2LG+T)；K2＝GN/(2LG+T)；
K3＝1/(2LG+T)；
Y(n)＝K1*X(n)+K2*X(n-1)+K3*Y(n-1)；}
if(Y(n)＞H)Y(n)＝H；else?if(Y(n)＜L)Y(n)＝L；
Wherein: T is a computation period; Last stationary value=GN*X of Y.
Parametric description in the concrete example of multiplication unit 32 can be as shown in the table:
| Token name | Data type | Default value | Describe |
| Output Y | float | 0.0 | Multiplication output |
| Input X1, X2 | float | 1.0 | The pointer of representing in the B.I mode, or floating number immediately |
| Parameter k1, k2 | float | 1.0 | Input X1, the gain of X2 |
| Parameters C 1, C2 | float | 0.0 | Input X1, the biasing of X2 |
Its specific algorithm can be expressed as: Y (n)=(k1*X1 (n)+C1) * (k2*X2 (n)+C2).
In the example of a specific implementation of above-mentioned load rate monitor unit 42, can do following setting to its parameter:
| Token name | Data type | Default value | Describe |
| Output D | bool | F | Speed limit indication more |
| Output D1 | bool | F | Forward speed limit indication more |
| Output D2 | bool | F | Negative sense speed limit indication more |
| Input X | float | 0.0 | The pointer of representing in the B.I mode, or floating number immediately |
| Input PL | float | 100.0 | Forward speed limit is a unit with the variable quantity of per minute |
| Input NL | float | 100.0 | Negative sense speed limit is a unit with the variable quantity of per minute |
The implementation of fuel quantity speed monitor unit 43, main steam flow amount speed monitor unit 44, feedwater flow speed monitor unit 45 can be with above-mentioned load rate monitor unit 42 identical, do not repeat them here.
Proofread and correct in the example of a specific implementation of control module 21 at above-mentioned calorific value, can do following setting its parameter:
| Token name | Data type | Default value | Describe |
| Output Y | float | 0.0 | PID output |
| Input E | float | 0.0 | The deviation input |
| Input YH | float | 100.0 | The upper limit of output |
| Input YL | float | 0.0 | The lower limit of output |
| Input TR | float | 0.0 | Tracked variable |
| Input TS | bool | F | Follow the tracks of change-over switch |
| Input Kp | float | 1.0 | The ratio amplification coefficient does not have proportional during Kp=0.0 |
| Input Ti | float | 0.0 | Integral time, unit is second, does not have integral during Ti=0.0 |
| Input Td | float | 0.0 | Derivative time, unit is second, does not have differential term during Td=0.0 |
| Parameter K d | float | 0.0 | The differentiator amplification coefficient |
| Parameter Edb | float | 0.0 | Deviate when integrator stops integration as E＞Edb＞0, stops integration |
| Parameter Dk | float | 0.0 | The modified value of Kp when integrator stops integration being revised the former Kp+Dk of back Kp= |
Calorific value is proofreaied and correct control module 21 when computing fuel calorific value correction coefficient, and its account form can be set at:
Be under the auto state in the calorific value correction:
E(s)＝SP(s)-PV(s)
Be under the tracking mode Y (s)=TR (s) in the calorific value correction
Wherein, Y and guarantees YH＞YL between YH and YL, to provide anti-integration saturated function.
Following setting can be done in the disconnected unit 47 of above-mentioned time-delay:
| Token name | Data type | Default value | Describe |
| Input Set | bool | F | The pointer of representing in the B.I mode, or Bolean number immediately |
| Output D | bool | F | Output finishes indicator cock |
| Input DT | float | 1.0 | Timing time, unit: second |
When the Set signal when 0 changes to 1, output D follows 1, before output D was not reset, then behind the DT of the negative edge of Set signal time-delay in the end, output D just was reset.
Above-described embodiment of the present invention only is the detailed description to one of them specific implementation of the present invention, does not constitute the qualification to the present invention program and protection domain.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (8)
1. a fuel value bearing calibration is characterized in that, comprises step:
Adopt the total fuel flow amount before the first fuel value correction coefficient is proofreaied and correct calorific value to proofread and correct, obtain fuel quantity after the correction after calorific value is proofreaied and correct;
Unit load according to reality calculates the equivalent fuel amount;
Described equivalent fuel amount and described correction back fuel quantity are compared, calculate the second fuel value correction coefficient by continuous PID computing;
Determine calorific value correction coefficient conservation condition according to unit load scope, unit load actual rate, fuel quantity rate of change and feedwater flow rate of change;
According to described calorific value correction coefficient conservation condition, determine automatic fuel calorific value correction coefficient, this automatic fuel calorific value correction coefficient is described first fuel value correction coefficient or the described second fuel value correction coefficient;
Adopt the 3rd fuel value correction coefficient of manual setting or the described automatic fuel calorific value correction coefficient of automatic reception to upgrade the described first fuel value correction coefficient by the hand automatic controller.
2. fuel value bearing calibration according to claim 1 is characterized in that, determines specifically to comprise the mode of automatic fuel calorific value correction coefficient according to described calorific value correction coefficient conservation condition:
When calorific value correction coefficient conservation condition is set up, adopt the described first fuel value correction coefficient as described automatic fuel calorific value correction coefficient;
After calorific value is proofreaied and correct input auto state and calorific value correction coefficient conservation condition disappearance Preset Time section, adopt the described second fuel value correction coefficient as described automatic fuel calorific value correction coefficient.
3. fuel value bearing calibration according to claim 1 and 2 is characterized in that, when satisfying following condition, judges and satisfies calorific value correction coefficient conservation condition:
Unit load is lower than the lower limit of unit load scope given in advance, perhaps unit is in the variation operating mode, and described variation operating mode comprises that unit load rate of change, fuel quantity rate of change, main steam flow quantitative change speed, feedwater flow rate of change etc. are higher than corresponding predetermined value.
4. a fuel value corrective system is characterized in that, comprising:
Fuel quantity calorific value corrective loop unit is used to adopt the total fuel flow amount before the first fuel value correction coefficient is proofreaied and correct calorific value to proofread and correct, and obtains fuel quantity after the correction after calorific value is proofreaied and correct;
Equivalent fuel amount counter circuit unit is used for calculating the equivalent fuel amount according to the unit load of reality;
Calorific value is proofreaied and correct control module, is used for described equivalent fuel amount and described correction back fuel quantity are compared, and calculates the second fuel value correction coefficient;
Follow the tracks of maintenance and judge circuit units, be used for determining calorific value correction coefficient conservation condition according to unit load scope, unit load actual rate, fuel quantity rate of change and feedwater flow rate of change;
Switch unit is used for determining automatic fuel calorific value correction coefficient according to described calorific value correction coefficient conservation condition that this automatic fuel calorific value correction coefficient is described first fuel value correction coefficient or the described second fuel value correction coefficient;
The automatic operating unit of hand, be used to receive the 3rd fuel value correction coefficient of manual setting, by the hand automatic switching function, adopt the described automatic fuel calorific value correction coefficient of described the 3rd fuel value correction coefficient or automatic reception to upgrade the described first fuel value correction coefficient, and the first fuel value correction coefficient after will upgrading export described fuel quantity calorific value corrective loop unit to.
5. fuel value corrective system according to claim 4 is characterized in that, described equivalent fuel amount counter circuit unit comprises:
Insert the first inertia processing unit of unit load signal, be used for that the unit load signal is carried out inertia and handle,
The load fuel function unit that input end is connected with the output terminal of the described first inertia processing unit, be used for calculating the equivalent fuel amount according to the unit load after the described inertia processing, the output terminal of load fuel function unit is connected with the input end that described calorific value is proofreaied and correct control module.
6. fuel value corrective system according to claim 4 is characterized in that, described fuel quantity calorific value corrective loop unit comprises:
Insert the second inertia processing unit of the total fuel flow amount signal before calorific value is proofreaied and correct, be used for that total fuel flow amount signal is carried out inertia and handle,
The multiplication unit that the output terminal of input end and the described second inertia processing unit and the correction coefficient output terminal of the automatic operating unit of hand are connected, being used for that described calorific value is proofreaied and correct preceding total fuel flow amount proofreaies and correct, fuel quantity behind the output calibration, the output terminal of multiplication unit is connected with the input end that described calorific value is proofreaied and correct control module.
7. fuel value corrective system according to claim 4 is characterized in that, described tracking keeps judging that circuit units comprises:
Insert the load lower bound monitor unit of unit load signal, the load rate monitor unit, insert the fuel quantity speed monitor unit of fuel flow signal, insert the main steam flow amount speed monitor unit of main steam flow amount signal, insert the feedwater flow speed monitor unit of feedwater flow signal, with described load lower bound monitor unit, the load rate monitor unit, fuel quantity speed monitor unit, main steam flow amount speed monitor unit, first or door that the output terminal of feedwater flow speed monitor unit is connected, input end and described first or the time-delay that is connected of output terminal of the door unit that breaks, second or the door that are connected with the output terminal of the disconnected unit of described time-delay, described second or the door input end also be connected with the hand auto state output terminal of the automatic operating unit of described hand, second or the door output terminal be connected with the input end of described switch unit.
8. fuel value corrective system according to claim 7, it is characterized in that: described second or the output terminal of door also be connected with the tracking input end that described calorific value is proofreaied and correct control module, the correction coefficient output terminal of the automatic operating unit of described hand also is connected with the tracking input end that described calorific value is proofreaied and correct control module.
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| CN102591201A (en) * | 2012-02-09 | 2012-07-18 | 山东电力研究院 | Control method of integral saturation resistance in auxiliary machine failure load reduction process |
| CN104067051A (en) * | 2012-01-23 | 2014-09-24 | 吉坤日矿日石能源株式会社 | Fuel supply system, fuel cell system, and method for running each |
| CN104848246A (en) * | 2015-06-03 | 2015-08-19 | 上海外高桥第二发电有限责任公司 | Layered calorific value correction mode based different-coal quantity control method |
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