CN116481045A - Combustion and water supply control method adapting to load change - Google Patents
Combustion and water supply control method adapting to load change Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 216
- 239000011159 matrix material Substances 0.000 claims description 26
- 230000003044 adaptive effect Effects 0.000 claims 8
- 230000007423 decrease Effects 0.000 abstract description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/002—Regulating fuel supply using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/212—Temperature of the water
- F24H15/219—Temperature of the water after heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/242—Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/40—Control of fluid heaters characterised by the type of controllers
- F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
- F24H15/421—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2057—Arrangement or mounting of control or safety devices for water heaters using solid fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Computer Hardware Design (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The application relates to the technical field of boiler combustion, in particular to a combustion and water supply control method adapting to load change. Comprising the following steps: acquiring a load instruction, and setting a control mode and a boiler load variation value according to the load instruction and a real-time load value; setting boiler water supply parameters and boiler coal supply parameters according to the control mode and the boiler load variation value; and acquiring a turbine pressure fluctuation value, and correcting the real-time water supply parameter and the coal supply parameter according to the turbine pressure fluctuation value. Different control modes are set by acquiring the load variation value of the boiler, so that when a load instruction suddenly decreases or suddenly increases, the operation parameters of the boiler are corrected in time, and the problem that the stable operation of the boiler is affected due to undervoltage or overpressure caused by long adjustment time is avoided.
Description
Technical Field
The application relates to the technical field of boiler combustion, in particular to a combustion and water supply control method adapting to load change.
Background
In the current stage, the boiler combustion unit responds to the power grid demand and once tries to operate AGC control, but under the AGC mode, a plurality of problems exist due to the source complexity of coal and the specificity of power grid dispatching.
The frequent repeated change of AGC instruction makes each control quantity of fuel, water supply, air supply, etc. of the machine set also fluctuate back and forth greatly, which is easy to cause the system stability to be reduced, and also is easy to cause adverse effect on the aspects of thermal stress and oxide scale falling of boiler water-cooled walls and superheater pipes, and increases the possibility of boiler pipe explosion.
When the fluctuation amplitude of the load command is large and the fluctuation frequency is high, in order to ensure that the unit responds to the load change quickly, the steam turbine command can respond quickly, the steam turbine high-pressure regulating gate fluctuates quickly, and when the traditional coal water ratio is used for directly controlling the water supply flow, the problems of large fluctuation of the main steam pressure of the machine side, long regulating time, under pressure or overpressure are easily caused due to the reasons of relatively lagged response of the coal quantity, large inertia of the coal combustion heat release and the like.
Disclosure of Invention
The purpose of the present application is: in order to solve the technical problems, the application provides a combustion and water supply control method adapting to load change. The main steam pressure is reduced to be greatly fluctuated, and the safe and stable operation of the boiler is ensured.
In some embodiments of the present application, different control modes are set by obtaining a boiler load variation value, so as to ensure that when a load instruction suddenly decreases or suddenly increases, an operation parameter of a boiler is corrected in time, and avoid the problem that an adjustment time is long to cause under-pressure or overpressure, thereby affecting the stable operation of the boiler.
In some embodiments of the present application, when the load command suddenly increases, the real-time water supply temperature and the target coal supply amount are corrected according to the real-time load command, and the real-time coal supply increasing rate and the water supply temperature increment are set according to the real-time boiler load variation value, so as to perform bidirectional gradient adjustment, solve the problems of relatively delayed coal amount response and large coal combustion heat release inertia, and ensure the stable operation of the boiler.
In some embodiments of the present application, a method of load-adaptive combustion and water delivery control is provided, comprising:
acquiring a load instruction, and setting a control mode and a boiler load variation value according to the load instruction and a real-time load value;
setting boiler water supply parameters and boiler coal supply parameters according to the control mode and the boiler load variation value;
and acquiring a turbine pressure fluctuation value, and correcting real-time water supply parameters and coal supply parameters according to the turbine pressure fluctuation value.
In some embodiments of the present application, when generating a boiler load variation value according to the load command and the real-time load value, the method includes:
acquiring a load instruction and generating an instruction load value A1;
acquiring a real-time load value A2;
generating a boiler load fluctuation value b according to the absolute value of the difference value between the instruction load value A1 and the real-time load value A2;
presetting a boiler load fluctuation threshold delta b;
when b is larger than delta b, setting a real-time control mode according to the instruction load value A1 and the real-time load value A2;
if A1 is less than A2, setting the real-time control mode as a primary control mode;
if A1 > A2, the real-time control mode is set as the secondary control mode.
In some embodiments of the present application, when setting the boiler feed water parameter and the boiler feed coal parameter according to the control mode and the boiler load variation value, the method includes:
presetting a boiler load variation value matrix B, and setting B (B1, B2, B3 and B4), wherein B1 is a preset first boiler load variation value, B2 is a preset second boiler load variation value, B3 is a preset third boiler load variation value, B4 is a preset first boiler load variation value, and B1 is more than B2 is less than B3 and less than B4;
if the real-time control mode is a primary control mode, setting a coal supply quantity reduction rate and a first target coal supply quantity according to the boiler load fluctuation value b, and setting a real-time water supply temperature according to a coal supply quantity difference value between the real-time coal supply quantity and the first target coal supply quantity;
if the real-time control mode is the secondary control mode, setting a coal supply quantity increasing rate and a second target coal supply quantity according to the boiler load fluctuation value b, and setting a real-time water supply temperature according to a coal supply quantity difference value between the real-time coal supply quantity and the second target coal supply quantity.
In some embodiments of the present application, when setting the rate of increase of the coal feed amount and the second target coal feed amount according to the boiler load fluctuation value b, the method includes:
setting a second target coal feeding amount according to the instruction load value A1, and setting a real-time coal feeding increasing rate c according to the boiler load fluctuation value b;
and adjusting the real-time coal feeding amount according to the real-time coal feeding increasing rate c, and stopping adjusting when the real-time coal feeding amount is equal to the second target coal feeding amount.
In some embodiments of the present application, when setting the real-time coal feeding increasing rate c according to the boiler load fluctuation value b, the method includes:
presetting a coal feed amount increasing rate matrix C, and setting C (C1, C2, C3 and C4), wherein C1 is a preset first coal feed increasing rate, C2 is a preset second coal feed increasing rate, C3 is a preset third coal feed increasing rate, C4 is a preset fourth coal feed increasing rate, and C1 is more than C2 and less than C3 and less than C4;
if B1 is smaller than B2, setting the real-time coal feeding increasing rate C as a preset first coal feeding increasing rate C1, namely c=c1;
if B2 is less than B3, setting the real-time coal feeding increasing rate C as a preset second coal feeding increasing rate C2, namely c=c2;
if B3 is less than B4, setting the real-time coal feeding increasing rate C as a preset third coal feeding increasing rate C3, namely c=c3;
if B > B4, setting the real-time coal feed increasing rate C as a preset fourth coal feed increasing rate C4, i.e., c=c4;
in some embodiments of the present application, when setting the real-time feedwater temperature according to a coal feed difference between the real-time coal feed and the second target coal feed includes:
acquiring a real-time coal feeding amount and a second target coal feeding amount, generating a coal feeding amount difference d, and setting a real-time water feeding temperature increment e according to the coal feeding amount difference d;
and obtaining a standard water supply temperature, and setting the real-time water supply temperature according to the real-time water supply temperature increment e and the standard water supply temperature.
In some embodiments of the present application, when setting the real-time feedwater temperature increment e according to the coal feeding amount difference d, the method includes:
presetting a coal supply quantity difference matrix D, and setting D (D1, D2, D3 and D4), wherein D1 is a preset first coal supply quantity difference, D2 is a preset second coal supply quantity difference, D3 is a preset third coal supply quantity difference, D4 is a preset fourth coal supply quantity difference, and D1 is less than D2 and less than D3 and less than D4;
presetting a water supply temperature increment matrix E, and setting E (E1, E2, E3 and E4), wherein E1 is a preset first water supply temperature increment, E2 is a preset second water supply temperature increment, E3 is a preset third water supply temperature increment, E4 is a preset fourth water supply temperature increment, and E1 is more than E2 and less than E3 and more than E4;
if D is less than D1, setting a real-time water supply temperature increment e=0;
if D1 is less than D2, setting the real-time water supply temperature increment E as a preset first water temperature increment E1, namely e=e1;
if D2 is less than D3, setting the real-time water supply temperature increment E as a preset second water temperature increment E2, namely e=e2;
if D3 is less than D4, setting the real-time water supply temperature increment E as a preset third water temperature increment E3, namely e=e3;
if D > D4, the real-time feedwater temperature increment E is set to a preset fourth water temperature increment E4, i.e., e=e4.
In some embodiments of the present application, when correcting the real-time feedwater parameters and the coal feeding parameters according to the turbine pressure fluctuation value, the method includes:
presetting a turbine pressure fluctuation matrix F, and setting F (F1, F2, F3 and F4), wherein F1 is a preset first turbine pressure fluctuation value, F2 is a preset second turbine pressure fluctuation value, F3 is a preset third turbine pressure fluctuation value, and F1 is less than F2 and less than F3;
presetting a coal feeding rate correction coefficient matrix N, and setting N (N1, N2 and N3), wherein N1 is a preset first coal feeding rate correction coefficient, N2 is a preset second coal feeding rate correction coefficient, N3 is a preset third coal feeding rate correction coefficient, and 1 is more than N1 and less than N2 is more than N3;
acquiring a turbine pressure fluctuation value f, setting a real-time coal feeding rate correction coefficient n according to the turbine pressure fluctuation value f, and correcting a real-time coal feeding increase rate c;
and setting a real-time water supply temperature increment compensation coefficient m according to the turbine pressure fluctuation value f, and correcting the real-time water supply temperature increment e.
In some embodiments of the present application, when setting the real-time coal feeding rate correction coefficient n according to the turbine pressure fluctuation value f, the method includes:
presetting a coal feeding rate correction coefficient matrix N, and setting N (N1, N2 and N3), wherein N1 is a preset first coal feeding rate correction coefficient, N2 is a preset second coal feeding rate correction coefficient, N3 is a preset third coal feeding rate correction coefficient, and 1 is more than N1 and less than N2 is more than N3;
if F is less than F1, not setting a real-time coal feeding rate correction coefficient n;
if F1 is less than F2, setting n=n1, and correcting the real-time coal feeding increasing rate c1=n1_Ci;
if F2 is less than F3, setting n=n2, and correcting the real-time coal feeding increasing rate c1=n2+ Ci;
if F > F3, n=n3 is set, and the corrected real-time coal feed increase rate c1=n3. Ci.
In some embodiments of the present application, setting a real-time feedwater temperature delta compensation coefficient m according to the turbine pressure fluctuation value f includes:
presetting a water supply temperature increment compensation coefficient matrix M, and setting M (M1, M2 and M3), wherein M1 is a preset first water supply temperature increment compensation coefficient, M2 is a preset second water supply temperature increment compensation coefficient, M3 is a preset third water supply temperature increment compensation coefficient, and M1 is more than 1 and less than M2 and less than M3;
setting a real-time water supply temperature increment compensation coefficient m according to the pressure fluctuation value of the steam turbine, and correcting a real-time water supply temperature increment e;
if F is less than F1, not setting a real-time water supply temperature increment compensation coefficient m;
if F1 is less than F2, setting m=m1, and correcting the real-time water supply temperature increment e1=m1_Ei;
if F2 is less than F3, setting m=m2, and correcting the real-time water supply temperature increment e1=m2+ Ei;
if F > F3, m=m3 is set, and the corrected real-time feedwater temperature increment e1=m3+Ei.
Compared with the prior art, the combustion and water supply control method adapting to load change has the beneficial effects that:
different control modes are set by acquiring the load variation value of the boiler, so that when a load instruction suddenly decreases or suddenly increases, the operation parameters of the boiler are corrected in time, and the problem that the stable operation of the boiler is affected due to undervoltage or overpressure caused by long adjustment time is avoided.
When the load command suddenly increases, the real-time water supply temperature and the target coal supply quantity are corrected according to the real-time load command, the real-time coal supply increasing rate and the water supply temperature increment are set according to the real-time boiler load fluctuation value, the bidirectional gradient adjustment is carried out, the problems that the response of the coal quantity is relatively lagged and the heat release inertia of the coal combustion is large are solved, and the stable operation of the boiler is ensured.
Drawings
FIG. 1 is a schematic flow chart of a method of load-adaptive combustion and feedwater control in accordance with a preferred embodiment of the present application.
Detailed Description
The detailed description of the present application is further described in detail below with reference to the drawings and examples. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As shown in fig. 1, a combustion and water supply control method adapted to load variation according to a preferred embodiment of the present application includes:
s101: acquiring a load instruction, and setting a control mode and a boiler load variation value according to the load instruction and a real-time load value;
s102: setting boiler water supply parameters and boiler coal supply parameters according to the control mode and the boiler load variation value;
s103: and acquiring a turbine pressure fluctuation value, and correcting the real-time water supply parameter and the coal supply parameter according to the turbine pressure fluctuation value.
Specifically, when generating a boiler load variation value from a load command and a real-time load value, the method includes:
acquiring a load instruction and generating an instruction load value A1;
acquiring a real-time load value A2;
generating a boiler load fluctuation value b according to the absolute value of the difference between the instruction load value A1 and the real-time load value A2;
presetting a boiler load fluctuation threshold delta b;
when b is larger than delta b, setting a real-time control mode according to the instruction load value A1 and the real-time load value A2;
if A1 is less than A2, setting the real-time control mode as a primary control mode;
if A1 > A2, the real-time control mode is set as the secondary control mode.
Specifically, when setting the boiler feed water parameter and the boiler feed coal parameter according to the control mode and the boiler load variation value, the method includes:
presetting a boiler load variation value matrix B, and setting B (B1, B2, B3 and B4), wherein B1 is a preset first boiler load variation value, B2 is a preset second boiler load variation value, B3 is a preset third boiler load variation value, B4 is a preset first boiler load variation value, and B1 is more than B2 is less than B3 and less than B4;
if the real-time control mode is a primary control mode, setting a coal supply quantity reduction rate and a first target coal supply quantity according to a boiler load fluctuation value b, and setting a real-time water supply temperature according to a coal supply quantity difference value between the real-time coal supply quantity and the first target coal supply quantity;
if the real-time control mode is the secondary control mode, setting a coal supply quantity increasing rate and a second target coal supply quantity according to the boiler load fluctuation value b, and setting a real-time water supply temperature according to a coal supply quantity difference value between the real-time coal supply quantity and the second target coal supply quantity.
It can be understood that in the above embodiment, the load fluctuation direction is determined by acquiring the instruction load value and the real-time load value, and different control modes are set according to different load fluctuation directions, so that when the load instruction suddenly decreases or suddenly increases, the operation parameters of the boiler are timely corrected, and the problem that the stable operation of the boiler is affected due to undervoltage or overpressure caused by long adjustment time is avoided.
In a preferred embodiment of the present application, when setting the rate of increase in the amount of coal feed and the second target amount of coal feed according to the boiler load fluctuation value b, the method includes:
setting a second target coal feeding amount according to the instruction load value A1, and setting a real-time coal feeding increasing rate c according to the boiler load fluctuation value b;
and adjusting the real-time coal feeding amount according to the real-time coal feeding increasing rate c, and stopping adjusting when the real-time coal feeding amount is equal to the second target coal feeding amount.
Specifically, when setting the real-time coal feed increasing rate c based on the boiler load fluctuation value b, the method includes:
presetting a coal feed amount increasing rate matrix C, and setting C (C1, C2, C3 and C4), wherein C1 is a preset first coal feed increasing rate, C2 is a preset second coal feed increasing rate, C3 is a preset third coal feed increasing rate, C4 is a preset fourth coal feed increasing rate, and C1 is more than C2 and less than C3 and less than C4;
if B1 is smaller than B2, setting the real-time coal feeding increasing rate C as a preset first coal feeding increasing rate C1, namely c=c1;
if B2 is less than B3, setting the real-time coal feeding increasing rate C as a preset second coal feeding increasing rate C2, namely c=c2;
if B3 is less than B4, setting the real-time coal feeding increasing rate C as a preset third coal feeding increasing rate C3, namely c=c3;
if B > B4, setting the real-time coal feed increasing rate C as a preset fourth coal feed increasing rate C4, i.e., c=c4;
specifically, when setting the real-time feed water temperature according to the feed water amount difference between the real-time feed water amount and the second target feed water amount, the method includes:
acquiring a real-time coal supply quantity and a second target coal supply quantity, generating a coal supply quantity difference d, and setting a real-time water supply temperature increment e according to the coal supply quantity difference d;
and obtaining a standard water supply temperature, and setting the real-time water supply temperature according to the real-time water supply temperature increment e and the standard water supply temperature.
Specifically, the standard water supply temperature is a real-time water supply temperature obtained when a load fluctuation command is received, and the real-time water supply temperature is set as the standard water supply temperature;
specifically, when the real-time water supply temperature increment e is set according to the coal supply amount difference d, the method includes:
presetting a coal supply quantity difference matrix D, and setting D (D1, D2, D3 and D4), wherein D1 is a preset first coal supply quantity difference, D2 is a preset second coal supply quantity difference, D3 is a preset third coal supply quantity difference, D4 is a preset fourth coal supply quantity difference, and D1 is less than D2 and less than D3 and less than D4;
presetting a water supply temperature increment matrix E, and setting E (E1, E2, E3 and E4), wherein E1 is a preset first water supply temperature increment, E2 is a preset second water supply temperature increment, E3 is a preset third water supply temperature increment, E4 is a preset fourth water supply temperature increment, and E1 is more than E2 and less than E3 and more than E4;
if D is less than D1, setting a real-time water supply temperature increment e=0;
if D1 is less than D2, setting the real-time water supply temperature increment E as a preset first water temperature increment E1, namely e=e1;
if D2 is less than D3, setting the real-time water supply temperature increment E as a preset second water temperature increment E2, namely e=e2;
if D3 is less than D4, setting the real-time water supply temperature increment E as a preset third water temperature increment E3, namely e=e3;
if D > D4, the real-time feedwater temperature increment E is set to a preset fourth water temperature increment E4, i.e., e=e4.
Specifically, when the load suddenly increases, due to certain hysteresis of the coal feed quantity response, the water feed temperature is preferentially adjusted, the load is met under the condition of the same coal feed quantity by improving the water feed temperature, and meanwhile, the real-time coal feed increasing rate and the water feed temperature increment are set according to the real-time boiler load fluctuation value to dynamically adjust, so that the stable operation of the boiler is ensured.
It can be understood that in the above embodiment, when the load command suddenly increases, the real-time feed water temperature and the target coal feeding amount are corrected according to the real-time load command, and the real-time coal feeding increasing rate and the feed water temperature increment are set according to the real-time boiler load variation value, so as to perform bidirectional gradient adjustment, solve the problems of relatively delayed response of the coal amount and large inertia of heat release of coal combustion, and ensure the stable operation of the boiler.
In a preferred embodiment of the present application, when correcting the real-time feedwater parameters and the coal feeding parameters according to the turbine pressure fluctuation value, the method includes:
presetting a turbine pressure fluctuation matrix F, and setting F (F1, F2, F3 and F4), wherein F1 is a preset first turbine pressure fluctuation value, F2 is a preset second turbine pressure fluctuation value, F3 is a preset third turbine pressure fluctuation value, and F1 is less than F2 and less than F3;
presetting a coal feeding rate correction coefficient matrix N, and setting N (N1, N2 and N3), wherein N1 is a preset first coal feeding rate correction coefficient, N2 is a preset second coal feeding rate correction coefficient, N3 is a preset third coal feeding rate correction coefficient, and 1 is more than N1 and less than N2 is more than N3;
acquiring a turbine pressure fluctuation value f, setting a real-time coal feeding rate correction coefficient n according to the turbine pressure fluctuation value f, and correcting a real-time coal feeding increase rate c;
and setting a real-time water supply temperature increment compensation coefficient m according to the turbine pressure fluctuation value f, and correcting the real-time water supply temperature increment e.
Specifically, when setting the real-time coal feed rate correction coefficient n according to the turbine pressure fluctuation value f, the method includes:
presetting a coal feeding rate correction coefficient matrix N, and setting N (N1, N2 and N3), wherein N1 is a preset first coal feeding rate correction coefficient, N2 is a preset second coal feeding rate correction coefficient, N3 is a preset third coal feeding rate correction coefficient, and 1 is more than N1 and less than N2 is more than N3;
if F is less than F1, not setting a real-time coal feeding rate correction coefficient n;
if F1 is less than F2, setting n=n1, and correcting the real-time coal feeding increasing rate c1=n1_Ci;
if F2 is less than F3, setting n=n2, and correcting the real-time coal feeding increasing rate c1=n2+ Ci;
if F > F3, n=n3 is set, and the corrected real-time coal feed increase rate c1=n3. Ci.
Specifically, the real-time feedwater temperature increment compensation coefficient m is set according to the turbine pressure fluctuation value f, and comprises the following steps:
presetting a water supply temperature increment compensation coefficient matrix M, and setting M (M1, M2 and M3), wherein M1 is a preset first water supply temperature increment compensation coefficient, M2 is a preset second water supply temperature increment compensation coefficient, M3 is a preset third water supply temperature increment compensation coefficient, and M1 is more than 1 and less than M2 and less than M3;
setting a real-time water supply temperature increment compensation coefficient m according to the pressure fluctuation value of the steam turbine, and correcting a real-time water supply temperature increment e;
if F is less than F1, not setting a real-time water supply temperature increment compensation coefficient m;
if F1 is less than F2, setting m=m1, and correcting the real-time water supply temperature increment e1=m1_Ei;
if F2 is less than F3, setting m=m2, and correcting the real-time water supply temperature increment e1=m2+ Ei;
if F > F3, m=m3 is set, and the corrected real-time feedwater temperature increment e1=m3+Ei.
It can be understood that in the above embodiment, by setting the coal feeding rate correction coefficient matrix and the water feeding temperature increment compensation coefficient matrix, the real-time coal feeding increase rate and the water feeding temperature increment are dynamically corrected according to the pressure fluctuation value of the steam turbine, so that the problem of large fluctuation of the main steam pressure of the machine side is avoided, and the stable operation of the boiler is ensured.
In some embodiments of the present application, different control modes are set by obtaining a boiler load variation value, so as to ensure that when a load instruction suddenly decreases or suddenly increases, an operation parameter of a boiler is corrected in time, and avoid the problem that an adjustment time is long to cause under-pressure or overpressure, thereby affecting the stable operation of the boiler.
In some embodiments of the present application, when the load command suddenly increases, the real-time water supply temperature and the target coal supply amount are corrected according to the real-time load command, and the real-time coal supply increasing rate and the water supply temperature increment are set according to the real-time boiler load variation value, so as to perform bidirectional gradient adjustment, solve the problems of relatively delayed coal amount response and large coal combustion heat release inertia, and ensure the stable operation of the boiler.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present application, and these modifications and substitutions should also be considered as being within the scope of the present application.
Claims (10)
1. A method of controlling combustion and water supply in response to load changes, comprising:
acquiring a load instruction, and setting a control mode and a boiler load variation value according to the load instruction and a real-time load value;
setting boiler water supply parameters and boiler coal supply parameters according to the control mode and the boiler load variation value;
and acquiring a turbine pressure fluctuation value, and correcting real-time water supply parameters and coal supply parameters according to the turbine pressure fluctuation value.
2. The load change adaptive combustion and feedwater control method of claim 1, wherein generating a boiler load variation value based on the load command and a real-time load value includes:
acquiring a load instruction and generating an instruction load value A1;
acquiring a real-time load value A2;
generating a boiler load fluctuation value b according to the absolute value of the difference value between the instruction load value A1 and the real-time load value A2;
presetting a boiler load fluctuation threshold delta b;
when b is larger than delta b, setting a real-time control mode according to the instruction load value A1 and the real-time load value A2;
if A1 is less than A2, setting the real-time control mode as a primary control mode;
if A1 > A2, the real-time control mode is set as the secondary control mode.
3. The load change adaptive combustion and water supply control method according to claim 2, wherein when setting a boiler water supply parameter and a boiler coal supply parameter according to the control mode and the boiler load change value, comprising:
presetting a boiler load variation value matrix B, and setting B (B1, B2, B3 and B4), wherein B1 is a preset first boiler load variation value, B2 is a preset second boiler load variation value, B3 is a preset third boiler load variation value, B4 is a preset first boiler load variation value, and B1 is more than B2 is less than B3 and less than B4;
if the real-time control mode is a primary control mode, setting a coal supply quantity reduction rate and a first target coal supply quantity according to the boiler load fluctuation value b, and setting a real-time water supply temperature according to a coal supply quantity difference value between the real-time coal supply quantity and the first target coal supply quantity;
if the real-time control mode is the secondary control mode, setting a coal supply quantity increasing rate and a second target coal supply quantity according to the boiler load fluctuation value b, and setting a real-time water supply temperature according to a coal supply quantity difference value between the real-time coal supply quantity and the second target coal supply quantity.
4. The load change adaptive combustion and water supply control method according to claim 3, wherein setting a rate of increase in a coal supply amount and a second target coal supply amount according to the boiler load fluctuation value b comprises:
setting a second target coal feeding amount according to the instruction load value A1, and setting a real-time coal feeding increasing rate c according to the boiler load fluctuation value b;
and adjusting the real-time coal feeding amount according to the real-time coal feeding increasing rate c, and stopping adjusting when the real-time coal feeding amount is equal to the second target coal feeding amount.
5. The load change adaptive combustion and water supply control method according to claim 4, wherein setting the real-time coal supply increase rate c according to the boiler load fluctuation value b comprises:
presetting a coal feed amount increasing rate matrix C, and setting C (C1, C2, C3 and C4), wherein C1 is a preset first coal feed increasing rate, C2 is a preset second coal feed increasing rate, C3 is a preset third coal feed increasing rate, C4 is a preset fourth coal feed increasing rate, and C1 is more than C2 and less than C3 and less than C4;
if B1 is smaller than B2, setting the real-time coal feeding increasing rate C as a preset first coal feeding increasing rate C1, namely c=c1;
if B2 is less than B3, setting the real-time coal feeding increasing rate C as a preset second coal feeding increasing rate C2, namely c=c2;
if B3 is less than B4, setting the real-time coal feeding increasing rate C as a preset third coal feeding increasing rate C3, namely c=c3;
if B > B4, the real-time coal feed increasing rate C is set to be a preset fourth coal feed increasing rate C4, i.e., c=c4.
6. The load-adaptive combustion and water supply control method according to claim 5, wherein the setting of the real-time water supply temperature according to the difference in the amount of supply coal between the real-time amount of supply coal and the second target amount of supply coal comprises:
acquiring a real-time coal feeding amount and a second target coal feeding amount, generating a coal feeding amount difference d, and setting a real-time water feeding temperature increment e according to the coal feeding amount difference d;
and obtaining a standard water supply temperature, and setting the real-time water supply temperature according to the real-time water supply temperature increment e and the standard water supply temperature.
7. The load change adaptive combustion and water supply control method according to claim 6, wherein when the real-time water supply temperature increment e is set according to the coal supply amount difference d, comprising:
presetting a coal supply quantity difference matrix D, and setting D (D1, D2, D3 and D4), wherein D1 is a preset first coal supply quantity difference, D2 is a preset second coal supply quantity difference, D3 is a preset third coal supply quantity difference, D4 is a preset fourth coal supply quantity difference, and D1 is less than D2 and less than D3 and less than D4;
presetting a water supply temperature increment matrix E, and setting E (E1, E2, E3 and E4), wherein E1 is a preset first water supply temperature increment, E2 is a preset second water supply temperature increment, E3 is a preset third water supply temperature increment, E4 is a preset fourth water supply temperature increment, and E1 is more than E2 and less than E3 and more than E4;
if D is less than D1, setting a real-time water supply temperature increment e=0;
if D1 is less than D2, setting the real-time water supply temperature increment E as a preset first water temperature increment E1, namely e=e1;
if D2 is less than D3, setting the real-time water supply temperature increment E as a preset second water temperature increment E2, namely e=e2;
if D3 is less than D4, setting the real-time water supply temperature increment E as a preset third water temperature increment E3, namely e=e3;
if D > D4, the real-time feedwater temperature increment E is set to a preset fourth water temperature increment E4, i.e., e=e4.
8. The load change adaptive combustion and water supply control method according to claim 7, wherein when correcting the real-time water supply parameter and the coal supply parameter according to the turbine pressure fluctuation value, comprising:
presetting a turbine pressure fluctuation matrix F, and setting F (F1, F2, F3 and F4), wherein F1 is a preset first turbine pressure fluctuation value, F2 is a preset second turbine pressure fluctuation value, F3 is a preset third turbine pressure fluctuation value, and F1 is less than F2 and less than F3;
presetting a coal feeding rate correction coefficient matrix N, and setting N (N1, N2 and N3), wherein N1 is a preset first coal feeding rate correction coefficient, N2 is a preset second coal feeding rate correction coefficient, N3 is a preset third coal feeding rate correction coefficient, and 1 is more than N1 and less than N2 is more than N3;
acquiring a turbine pressure fluctuation value f, setting a real-time coal feeding rate correction coefficient n according to the turbine pressure fluctuation value f, and correcting a real-time coal feeding increase rate c;
and setting a real-time water supply temperature increment compensation coefficient m according to the turbine pressure fluctuation value f, and correcting the real-time water supply temperature increment e.
9. The load change adaptive combustion and water supply control method according to claim 8, wherein when setting the real-time coal supply rate correction coefficient n according to the turbine pressure fluctuation value f, comprising:
presetting a coal feeding rate correction coefficient matrix N, and setting N (N1, N2 and N3), wherein N1 is a preset first coal feeding rate correction coefficient, N2 is a preset second coal feeding rate correction coefficient, N3 is a preset third coal feeding rate correction coefficient, and 1 is more than N1 and less than N2 is more than N3;
if F is less than F1, not setting a real-time coal feeding rate correction coefficient n;
if F1 is less than F2, setting n=n1, and correcting the real-time coal feeding increasing rate c1=n1_Ci;
if F2 is less than F3, setting n=n2, and correcting the real-time coal feeding increasing rate c1=n2+ Ci;
if F > F3, n=n3 is set, and the corrected real-time coal feed increase rate c1=n3. Ci.
10. The load change adaptive combustion and feedwater control method of claim 8, wherein setting a real-time feedwater temperature delta compensation coefficient m based on the turbine pressure fluctuation f includes:
presetting a water supply temperature increment compensation coefficient matrix M, and setting M (M1, M2 and M3), wherein M1 is a preset first water supply temperature increment compensation coefficient, M2 is a preset second water supply temperature increment compensation coefficient, M3 is a preset third water supply temperature increment compensation coefficient, and M1 is more than 1 and less than M2 and less than M3;
setting a real-time water supply temperature increment compensation coefficient m according to the pressure fluctuation value of the steam turbine, and correcting a real-time water supply temperature increment e;
if F is less than F1, not setting a real-time water supply temperature increment compensation coefficient m;
if F1 is less than F2, setting m=m1, and correcting the real-time water supply temperature increment e1=m1_Ei;
if F2 is less than F3, setting m=m2, and correcting the real-time water supply temperature increment e1=m2+ Ei; if F > F3, m=m3 is set, and the corrected real-time feedwater temperature increment e1=m3+Ei.
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