CN115167187A - Automatic coal feeder control system suitable for deep peak regulation working condition of coal electric machine set - Google Patents
Automatic coal feeder control system suitable for deep peak regulation working condition of coal electric machine set Download PDFInfo
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- CN115167187A CN115167187A CN202210994714.3A CN202210994714A CN115167187A CN 115167187 A CN115167187 A CN 115167187A CN 202210994714 A CN202210994714 A CN 202210994714A CN 115167187 A CN115167187 A CN 115167187A
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Abstract
The invention discloses an automatic control system of a coal feeder suitable for a deep peak regulation working condition of a coal-electric machine set, wherein the output end of a second analog quantity AI input module and the output end of a third analog quantity AI input module are connected with the input end of a second large selector, and the output end of a first switching quantity DI input module, the output end of a fourth analog quantity AI input module and the output end of a first constant block are connected with the input end of a third analog quantity selector; the output end of the first switching value DI input module, the output end of the second constant block and the output end of the third constant block are connected with the input end of a fourth analog quantity selector, the output end of the fourth analog quantity selector and the output end of the third analog quantity selector are connected with the input end of a speed limiter, the output end of the speed limiter and the output end of the second large selector are connected with the input end of an adder, the output end of the adder is connected with the input end of a third analog quantity AO output module, and the system can realize automatic control of the coal feeder.
Description
Technical Field
The invention belongs to the field of automatic control of coal-electricity units, and relates to an automatic coal feeder control system suitable for deep peak regulation working conditions of the coal-electricity units.
Background
The flexibility of the unit generally refers to the flexibility of the unit in operation, and the main indexes comprise peak regulation amplitude, climbing speed and the like, wherein the reduction of the minimum output of the unit, namely the increase of the peak regulation capacity, is the most extensive and main modification target at present. The general peak regulation operation interval of the coal-electricity units in China is 50% -100% of rated load, and the increase of deep peak regulation capability requires that the peak regulation operation lower limit of the units is further reduced from 50% of rated load, such as reduced to 30% of rated load or below. At present, flexible transformation of a part of coal-electricity units in China is completed, the capacity of deep peak regulation is realized, and flexible transformation work is carried out on most of the rest units.
Coal electric machine pulverizing systems are generally equipped with multiple sets of coal mills and coal feeders, for example, coal electric machine sets of 600MW grade and 1000MW grade are generally equipped with 6 sets of coal mills and coal feeders. In the deep peak regulation working condition, the total coal quantity required by combustion is reduced along with the reduction of the load of the unit, the number of coal feeders which are put into operation is reduced along with the reduction of the load of the unit, meanwhile, in order to ensure the combustion safety of the boiler, the number of the coal feeders which are operated cannot be too small, and generally, two or three coal feeders are kept to operate at least in the deep peak regulation working condition. The conventional fuel main control automatic control mode adopts a coal quantity balance mode, namely, the total coal quantity is maintained on a target value through a PID (proportion integration differentiation) adjusting function of the fuel main control, the output of the fuel main control acts on a coal feeding quantity instruction of each coal feeder which is put into automatic control, the coal feeding quantity instruction of each coal feeder which is put into automatic control is equal under the condition of human non-intervention, when the coal feeding quantity instruction of a certain coal feeder is intervened manually, for example, the coal quantity instruction offset of a single coal feeder is increased/decreased manually, and through the PID adjusting function of the fuel main control, the coal feeding quantity instructions of other coal feeders can be correspondingly decreased/increased, and the stability of the total coal quantity is maintained all the time.
The boiler of the coal-fired unit has corresponding design coal types during model selection, and when the deviation between the coal type entering a hearth and the design coal type is too large, the safety and the economy of the boiler are greatly influenced, so that when the coal source coal quality is unstable, power generation enterprises can mix different coal types according to a certain proportion according to a certain principle to form coal blending and burning. Under the deep peak regulation working condition, the temperature of a boiler hearth is reduced, and when coal with higher moisture and lower calorific value enters the hearth, combustion deterioration and even fire extinguishment can be caused, so that the coal feeding amount of a coal feeder with the coal from the coal is required to be increased, and the ignition combustion capacity of coal powder is improved. The method comprises the steps that a production operator changes a coal feeding amount instruction by adjusting a bias instruction during automatic operation of the coal feeder, or quits the automatic operation of the coal feeder, and the coal feeding amount instruction is directly changed by manual input, so that one part of the coal feeder keeps a low coal feeding amount as much as possible, and the other part of the coal feeder keeps a high coal feeding amount. Therefore, under the deep peak regulation working condition, production operators need to frequently and manually adjust the coal feeding quantity instruction of each coal feeder.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic coal feeder control system suitable for the deep peak shaving working condition of a coal motor set, which can realize the automatic control of the coal feeder.
In order to achieve the aim, the automatic coal feeder control system suitable for the deep peak regulation working condition of the coal electric unit comprises a first switching value DI input module, a second analog quantity AI input module, a third analog quantity AI input module, a second large selector, an adder, a third analog quantity AO output module, a rate limiter, a third analog quantity selector, a fourth analog quantity AI input module, a first constant block, a fourth analog quantity selector, a second constant block and a third constant block;
the output end of the first switching value DI input module, the output end of the fourth analog quantity AI input module and the output end of the first constant block are connected with the input end of the third analog quantity selector; the output end of the first switching value DI input module, the output end of the second constant block and the output end of the third constant block are connected with the input end of a fourth analog quantity selector, the output end of the fourth analog quantity selector and the output end of the third analog quantity selector are connected with the input end of a rate limiter, the output end of the rate limiter and the output end of the second large selector are connected with the input end of an adder, and the output end of the adder is connected with the input end of a third analog quantity AO output module.
The device also comprises a switching value DO output module, a logic AND module, a second switching value DI input module, a third switching value DI input module, a low value judger and a first subtracter;
the output end of the second analog quantity AI input module and the output end of the third analog quantity AI input module are connected with the input end of the first subtracter, the output end of the first subtracter is connected with the input end of the low value judging device, the output end of the second switching quantity DI input module and the output end of the third switching quantity DI input module are connected with the input end of the logic and module, the output end of the logic and module is connected with the input end of the switching quantity DO output module, and the output end of the switching quantity DO output module is connected with the input end of the first switching quantity DI input module.
The device also comprises a first analog quantity AO output module, a first large selector, a broken line function module, a first analog quantity selector and a first analog quantity AI input module;
the output end of the first analog quantity AI input module is connected with the input end of the fold line function module, the output end of the first switching quantity DI input module and the output end of the first analog quantity selector are connected with the input end of the first analog quantity selector, the output end of the first analog quantity selector and the output end of the fold line function module are connected with the input end of the first large selector, the output end of the first large selector is connected with the input end of the first analog quantity AO output module, and the output end of the first analog quantity AO output module is connected with the input end of the third analog quantity AI input module.
The system also comprises a second subtracter, a small selector, a second analog quantity selector, a delay module and a second analog quantity AO output module;
the output end of the first switching value DI input module, the output end of the second analog quantity AI input module and the output end of the delay module are connected with the input end of a second analog quantity selector, the output end of the second analog quantity selector and the output end of the second analog quantity AI input module are connected with the input end of a small selector, the output end of the small selector is connected with the input end of the delay module and the input end of a second subtracter, the output end of the second analog quantity AI input module is connected with the input end of the second subtracter, the output end of the second subtracter is connected with the input end of a second analog quantity AO output module, and the output end of the second analog quantity AO output module is connected with the input end of a fourth analog quantity AI input module.
The given value A1=0 of the first constant block, the given value A2 > 0 of the second constant block, the given value A3 > 0 of the third constant block, the given value L0=0 of the low value judger, the given value D0 > 0 of the delay block.
The invention has the following beneficial effects:
when the automatic control system of the coal feeder suitable for the deep peak regulation working condition of the coal-electric machine set is operated specifically, the coal feeding quantity instruction lower limit is set in the selected coal feeder, when the fuel main control output is smaller than the coal feeding quantity instruction lower limit, the coal feeding quantity instruction of the selected coal feeder is not smaller than the instruction lower limit any more, and the coal feeding quantity instructions of the rest coal feeders are adjusted along with the fuel main control; under the condition that the main fuel control output is smaller than the lower limit of the coal feeding quantity instruction, when the main fuel control output is in the enlarging process, the coal feeding quantity instruction of the selected coal feeder can be increased on the basis of the lower limit of the coal feeding quantity instruction; when the fuel main control output is reduced, the coal feeding quantity instruction of the selected coal feeder is gradually reduced until the instruction lower limit is reached; when the fuel main control output is larger than the lower limit of the coal feeding quantity instruction, the coal feeding quantity instruction of the selected coal feeder is gradually reduced until the coal feeding quantity instruction is equal to the fuel main control output, and the coal feeding quantity instructions of all the running coal feeders synchronously change along with the fuel main control output. The invention can effectively reduce the frequent interference of production operators of power generation enterprises on the coal feeding quantity instruction of the coal feeder, really realize the automatic control of the coal feeder under the deep peak regulation working condition, achieve the effects that part of the coal feeders have more coal feeding quantity and the rest of the coal feeders have smaller coal feeding quantity, and ensure the stable combustion of the boiler under the deep peak regulation working condition.
Drawings
FIG. 1 is a partial block diagram of the present invention;
FIG. 2 is a partial block diagram of the present invention;
FIG. 3 is a partial block diagram of the present invention;
FIG. 4 is a partial block diagram of the present invention;
wherein 1 is a first analog quantity AO output module, 2 is a first large selector, 3 is a broken line function module, 4 is a first analog quantity selector, 5 is a first analog quantity AI input module, 6 is a first switching quantity DI input module, 7 is a switching quantity DO output module, 8 is a logical and module, 9 is a second switching quantity DI input module, 10 is a third switching quantity DI input module, 11 is a low value determiner, 12 is a first subtractor, 13 is a second analog quantity AI input module, 14 is a third analog quantity AI input module, 15 is a second subtractor, 16 is a small selector, 17 is a second analog quantity selector, 18 is a delay module, 19 is a second analog quantity AO output module, 20 is a second large selector, 21 is an adder, 22 is a third analog quantity AO output module, 23 is a rate limiter, 24 is a third analog quantity selector, 25 is a fourth analog quantity AI input module, 26 is a first block, 27 is a fourth analog quantity selector, 28 is a constant block, 29 is a constant block, a is a coal feeder coal feeding amount instruction lower limit, b is a set condition, c is a coal feeding amount instruction superposition component, d is a coal feeding amount instruction superposition component c superposition rate, and e is a coal feeder coal feeding amount instruction.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1 to 4, the automatic control system for a coal feeder suitable for the deep peaking condition of a coal-electric machine set according to the present invention includes a first analog quantity AO output module 1, a first large selector 2, a broken line function module 3, a first analog quantity selector 4, a first analog quantity AI input module 5, a first switching quantity DI input module 6, a switching quantity DO output module 7, a logical and module 8, a second switching quantity DI input module 9, a third switching quantity DI input module 10, a low value determiner 11, a first subtractor 12, a second analog quantity AI input module 13, a third analog quantity AI input module 14, a second subtractor 15, a small selector 16, a second analog quantity selector 17, a delay module 18, a second analog quantity output module 19, a second large selector 20, an adder 21, a third analog quantity AO output module 22, a rate limiter 23, a third analog quantity selector 24, a fourth analog quantity AI input module 25, a first constant block 26, a fourth analog quantity selector 27, a third constant block 28, and a third constant block 29;
the output end of the second analog AI input module 13 and the output end of the third analog AI input module 14 are connected to the input end of the second large selector 20, and the output end of the first switching value DI input module 6, the output end of the fourth analog AI input module 25 and the output end of the first constant block 26 are connected to the input end of the third analog selector 24; the output of the first switching value DI input module 6, the output of the second constant block 28 and the output of the third constant block 29 are connected to the input of a fourth analog quantity selector 27, the output of the fourth analog quantity selector 27 and the output of the third analog quantity selector 24 are connected to the input of a rate limiter 23, the output of the rate limiter 23 and the output of the second large selector 20 are connected to the input of an adder 21, and the output of the adder 21 is connected to the input of a third analog quantity AO output module 22;
the output end of the second analog AI input module 13 and the output end of the third analog AI input module 14 are connected to the input end of the first subtractor 12, the output end of the first subtractor 12 is connected to the input end of the low value determiner 11, the output end of the second switching value DI input module 9, and the output end of the third switching value DI input module 10 are connected to the input end of the logical conjunction module 8, the output end of the logical conjunction module 8 is connected to the input end of the switching value DO output module 7, and the output end of the switching value DO output module 7 is connected to the input end of the first switching value DI input module 6;
the output end of the first analog quantity AI input module 5 is connected with the input end of the broken line function module 3, the output end of the first switching quantity DI input module 6 and the output end of the first analog quantity selector 4 are connected with the input end of the first analog quantity selector 4, the output end of the first analog quantity selector 4 and the output end of the broken line function module 3 are connected with the input end of the first large selector 2, the output end of the first large selector 2 is connected with the input end of the first analog quantity AO output module 1, and the output end of the first analog quantity AO output module 1 is connected with the input end of the third analog quantity AI input module 14.
The output of the first switching value DI input module 6, the output of the second analog value AI input module 13 and the output of the delay module 18 are connected to the input of a second analog value selector 17, the output of the second analog value selector 17 and the output of the second analog value AI input module 13 are connected to the input of a small selector 16, the output of the small selector 16 is connected to the input of the delay module 18 and the input of a second subtractor 15, the output of the second analog value AI input module 13 is connected to the input of a second subtractor 15, the output of the second subtractor 15 is connected to the input of a second analog value AO output module 19, and the output of the second analog value AO output module 19 is connected to the input of a fourth analog value AI input module 25.
The working process of the invention is as follows:
1) Setting a given value A1=0 of the first constant block 26, a given value A2 > 0 of the second constant block 28, a given value A3 > 0 of the third constant block 29, a given value L0=0 of the low value judger 11, a given value D0 > 0 of the delay module 18;
2) Acquiring a boiler main control output signal, a fuel main control automatic signal, a coal feeder control automatic signal and a fuel main control output signal;
3) Calculating a coal feeding amount instruction lower limit a of the coal feeder according to the boiler master control output signal, wherein the larger the numerical value of the boiler master control output signal is, the smaller the numerical value of the coal feeding amount instruction lower limit a of the coal feeder is; the smaller the numerical value of the main control output signal of the boiler is, the larger the numerical value of the lower limit a of the coal feeding quantity instruction of the coal feeder is;
4) Calculating the difference between the numerical value of the fuel main control output signal and the coal feeding amount instruction lower limit a of the coal feeder, and simultaneously obtaining a set condition b according to the calculated difference, the fuel main control automatic signal and the coal feeder control automatic signal; when the numerical value of the fuel main control output signal is smaller than the coal feeding amount instruction lower limit a of the coal feeder, b =1; when the difference value of the main control output signals of the fuel is larger than or equal to the lower limit a of the coal feeding amount instruction of the coal feeder, b =0;
5) Calculating a coal feeding amount command superposition component c according to the fuel main control output signal, wherein when b =0, c =0; when b =1, if the value of the fuel main control output signal is smaller, c =0, and if the value of the fuel main control output signal is larger, c > 0;
6) Calculating to obtain a coal feeding amount instruction e of the coal feeder according to the fuel main control output signal, the coal feeding amount instruction lower limit a of the coal feeder and the coal amount instruction superposition component c; when b =0, the coal feeding amount instruction e = the numerical value of the fuel main control output signal; when b =1, if the numerical value of the fuel main control output signal is smaller, the coal feeder coal feeding quantity instruction e = the coal feeder coal feeding quantity instruction lower limit a, and if the numerical value of the fuel main control output signal is larger, the coal feeder coal feeding quantity instruction e = the coal feeder coal feeding quantity instruction lower limit a + the coal feeding quantity instruction superposition component c; and slowly superposing the coal feeding instruction superposition component c to a coal feeding instruction e of a coal feeder at a speed d.
Claims (9)
1. An automatic coal feeder control system suitable for a deep peak regulation working condition of a coal electric unit is characterized by comprising a first switching value DI input module (6), a second analog quantity AI input module (13), a third analog quantity AI input module (14), a second large selector (20), an adder (21), a third analog quantity AO output module (22), a rate limiter (23), a third analog quantity selector (24), a fourth analog quantity AI input module (25), a first constant block (26), a fourth analog quantity selector (27), a second constant block (28) and a third constant block (29);
the output end of the second analog quantity AI input module (13) and the output end of the third analog quantity AI input module (14) are connected with the input end of the second large selector (20), and the output end of the first switching quantity DI input module (6), the output end of the fourth analog quantity AI input module (25) and the output end of the first constant block (26) are connected with the input end of the third analog quantity selector (24); the output end of the first switching value DI input module (6), the output end of the second constant block (28) and the output end of the third constant block (29) are connected with the input end of a fourth analog quantity selector (27), the output end of the fourth analog quantity selector (27) and the output end of a third analog quantity selector (24) are connected with the input end of a rate limiter (23), the output end of the rate limiter (23) and the output end of the second large selector (20) are connected with the input end of an adder (21), and the output end of the adder (21) is connected with the input end of a third analog quantity AO output module (22).
2. The automatic control system for the coal feeder suitable for the deep peak shaving working condition of the coal-electric machine set as claimed in claim 1, further comprising a switching value DO output module (7), a logical AND module (8), a second switching value DI input module (9), a third switching value DI input module (10), a low value judger (11) and a first subtracter (12);
the output end of the second analog quantity AI input module (13) and the output end of the third analog quantity AI input module (14) are connected with the input end of the first subtracter (12), the output end of the first subtracter (12) is connected with the input end of the low value judger (11), the output end of the second switching quantity DI input module (9) and the output end of the third switching quantity DI input module (10) are connected with the input end of the logic and module (8), the output end of the logic and module (8) is connected with the input end of the switching quantity DO output module (7), and the output end of the switching quantity DO output module (7) is connected with the input end of the first switching quantity DI input module (6).
3. The automatic coal feeder control system suitable for the deep peak regulation condition of the coal-electric machine set according to claim 1, further comprising a first analog quantity AO output module (1), a first large selector (2), a broken line function module (3), a first analog quantity selector (4) and a first analog quantity AI input module (5);
the output end of the first analog quantity AI input module (5) is connected with the input end of the broken line function module (3), the output end of the first switching quantity DI input module (6) and the output end of the first analog quantity selector (4) are connected with the input end of the first analog quantity selector (4), the output end of the first analog quantity selector (4) and the output end of the broken line function module (3) are connected with the input end of the first large selector (2), the output end of the first large selector (2) is connected with the input end of the first analog quantity AO output module (1), and the output end of the first analog quantity AO output module (1) is connected with the input end of the third analog quantity AI input module (14).
4. The automatic coal feeder control system suitable for the deep peak shaving condition of the coal-electric machine set according to claim 1, further comprising a second subtracter (15), a small selector (16), a second analog quantity selector (17), a delay module (18) and a second analog quantity AO output module (19);
the output end of the first switching value DI input module (6), the output end of the second analog quantity AI input module (13) and the output end of the delay module (18) are connected with the input end of a second analog quantity selector (17), the output end of the second analog quantity selector (17) and the output end of the second analog quantity AI input module (13) are connected with the input end of a small selector (16), the output end of the small selector (16) is connected with the input end of the delay module (18) and the input end of a second subtracter (15), the output end of the second analog quantity AI input module (13) is connected with the input end of a second subtracter (15), the output end of the second subtracter (15) is connected with the input end of a second analog quantity AO output module (19), and the output end of the second analog quantity output module (19) is connected with the input end of a fourth analog quantity AI input module (25).
5. The automatic coal feeder control system suitable for the deep peak shaving condition of the coal motor set as claimed in claim 1, wherein a given value A1=0 of the first constant block (26).
6. The automatic control system for the coal feeder suitable for the deep peak shaving condition of the coal-electric machine set according to claim 1, characterized in that a given value A2 of a second constant block (28) is greater than 0.
7. The automatic control system of the coal feeder suitable for the deep peak shaving working condition of the coal-electric machine set as claimed in claim 1, characterized in that the given value A3 of the third constant block (29) is more than 0.
8. The automatic control system for the coal feeder suitable for the deep peak shaving condition of the coal-electric machine set according to claim 1, characterized in that the given value L0=0 of the low value judger (11).
9. The automatic control system for the coal feeder suitable for the deep peak shaving condition of the coal-electric machine set as claimed in claim 1, wherein the given value D0 of the delay module (18) is greater than 0.
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| CN115167187B (en) | 2023-07-25 |
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