CN110345506B - Quick frequency modulation method and device for coal-fired boiler unit - Google Patents
Quick frequency modulation method and device for coal-fired boiler unit Download PDFInfo
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- CN110345506B CN110345506B CN201910642254.6A CN201910642254A CN110345506B CN 110345506 B CN110345506 B CN 110345506B CN 201910642254 A CN201910642254 A CN 201910642254A CN 110345506 B CN110345506 B CN 110345506B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
The application discloses a method and a device for quickly modulating the frequency of a coal-fired boiler unit, which coordinate and control the rotating speed of a dynamic separator, the ventilation quantity of a coal mill and the coal quantity entering the boiler by acquiring a combustion characteristic function and a coal quantity-coal powder quantity relation curve of the coal-fired boiler unit according to an AGC (automatic gain control) instruction with a target load, so that the actual coal powder entering variation of the coal-fired boiler unit quickly tracks the target value of the coal powder entering variation, can realize quick and accurate response of the coal-fired boiler unit to the AGC instruction under the condition of ensuring boiler combustion and stable steam temperature wall temperature, solves the problems of low variable load rate, low adjustment precision and the like of the traditional coordination control optimization technology, makes up the defects of a battery energy storage system, and can well meet the requirement of the frequency modulation performance of a power grid on the coal.
Description
Technical Field
The application relates to the technical field of coal-fired boilers, in particular to a method and a device for quickly adjusting the frequency of a coal-fired boiler unit.
Background
With the increasing requirements of the power grid on the power supply quality, the coal-fired boiler units in the power grid area are required to participate in frequency modulation auxiliary service, that is, the coal-fired boiler units are required to make quick load response so as to ensure the stability of the power grid frequency.
In order to meet the frequency requirement of a power grid and obtain income in the auxiliary allocation service provided by the power grid, more and more coal-fired power plants begin to invest and build a battery energy storage system, and the small-range quick change output power of a coal-fired unit can be realized through the charging and discharging of the battery energy storage system, so that the short-time quick adjustment of the power grid frequency is realized. However, the battery energy storage system cannot improve the self-regulation characteristic of the unit, the investment cost of the battery energy storage system is high, and the battery is difficult to recycle. The method for improving the frequency modulation performance of the coal-fired boiler unit is to optimize the traditional coordination control mode, but the traditional coordination control optimization technology has two main problems, one is that the output of coal is increased to the output of pulverized coal, so that great delay exists, the variable load rate is limited, and the other is that under the same variable load amplitude, the change of the coal quantity of coal types with different heat values is also limited by PID feedback control of pressure, so that the traditional coordination control optimization technology needs to greatly overshoot to improve the variable load rate, and the large fluctuation of the main steam temperature and the main steam pressure, even the overtemperature and overpressure are caused.
Therefore, the technical problems to be solved urgently by the technical personnel in the field are to make up for the defects of the battery energy storage system and to improve the defects of low variable load rate and low regulation precision of the traditional coordination control optimization technology.
Disclosure of Invention
The embodiment of the application provides a method and a device for quickly modulating the frequency of a coal-fired boiler unit, which are used for making up the defects of a battery energy storage system and improving the defects of low variable load rate and low adjustment precision of the traditional coordination control optimization technology.
In view of the above, the first aspect of the present application provides a method for fast frequency modulation of a coal-fired boiler unit, comprising the following steps:
101. acquiring a combustion characteristic function according to a unit load-input heat relation of a coal-fired boiler unit, and calculating input heat and a fired coal heat value according to real-time operation data of the coal-fired boiler unit, wherein the real-time operation data comprises unit power and fired coal amount;
102. acquiring a relation curve of the coal-as-fired quantity and the coal powder quantity of the coal-fired boiler unit, and calculating the coal powder as-fired quantity and the coal powder heat value according to the relation curve of the coal-as-fired quantity and the coal powder quantity;
103. acquiring an AGC instruction of a target load, calculating a unit load change rate according to the target load and the current load, and calculating an input heat change rate;
104. and acquiring a target value of the variation of the pulverized coal entering the boiler according to the variation rate of the input heat, and adjusting the rotating speed of a dynamic separator, the ventilation quantity of a coal mill and the coal entering quantity to ensure that the actual pulverized coal entering the boiler of the coal-fired boiler unit has the same variation as the target value of the variation of the pulverized coal entering the boiler.
Preferably, step 101 specifically includes:
1011. when the coal quality of the boiler is stable, carrying out a variable load test on the boiler unit of the coal burning boiler to obtain a unit load-input heat relation curve;
1012. differentiating the relation curve of the unit load and the input heat to obtain a combustion characteristic function f of the unit1Said combustionCharacteristic function f1The expression of (a) is:
ΔQnet＝f1(ΔP)，
wherein, is Δ QnetThe change rate of input heat entering the boiler is delta P, and the delta P is the load change rate of the boiler unit;
1013. and acquiring real-time operation data of the coal-fired boiler unit, and calculating input heat and a heat value of coal as fired according to the unit load-input heat relation curve.
Preferably, step 102 specifically includes:
1021. obtaining the coal powder entering the furnace to carry out moisture assay, and generating a relationship curve f of the coal quantity entering the furnace and the coal powder quantity according to the operation parameters and data analysis of a coal pulverizing system2The relationship curve f of the coal amount entering the furnace and the coal dust amount2The expression of (a) is:
Gmf＝f2(Gm)，
wherein G ismfIn order to obtain the amount of coal powder charged into the furnace, GmThe amount of coal charged into the furnace.
1022. According to the relationship curve f of the coal amount entering the furnace and the coal dust amount2Calculating the amount of coal powder entering the furnace and the heat value of the coal powder, wherein the expression of calculating the heat value of the coal powder is as follows:
Qmf＝Gm×Qnet,ar/Gmf，
wherein Q ismfIs the calorific value, Q, of the coal dustnet,arThe heat value of the coal as fired is obtained.
Preferably, step 103 specifically includes:
1031. obtaining an AGC instruction to obtain a target load;
1032. calculating the load change rate of the unit according to the target load and the current load;
1033. according to the unit load change rate and the combustion characteristic function f1The rate of change of the input heat is calculated.
Preferably, step 104 specifically includes:
1041. calculating the target value delta G of the variation of the coal dust entering the furnace according to the input heat variation rate and the coal dust heat valuemf,SPThe target value of the variation of the pulverized coal entering the furnaceΔGmf,SPThe calculation formula of (2) is as follows:
1042. adjusting the rotating speed of the dynamic separator according to the obtained characteristic function of the dynamic separator, and/or adjusting the ventilation of the coal mill to control the variation delta G of the first actual coal powder entering the furnacemf,pv1Regulating the amount of coal charged to control the second actual amount of coal charged to the furnace
So that the first actual pulverized coal entering furnace has a variable quantity delta Gmf,pv1And the second actual amount of change in pulverized coal charged into the furnace
The sum of the total summf,SP；
F of the characteristic function of the dynamic separator3Comprises the following steps:
ΔM1mf＝f3(ΔS)，
wherein, Delta S is the variation of the rotating speed of the dynamic separator, Delta M1mfThe variable quantity of the coal dust entering the furnace is obtained;
the first actual pulverized coal charge variation Δ Gmf,pv1The relational expression of the dynamic separator, the rotating speed and the coal mill ventilation quantity is as follows:
the second actual amount of change in pulverized coal charged into the furnace
According to the relationship curve f of the coal amount entering the furnace and the coal dust amount2And the amount of coal charged into the boiler of the unit is obtained, wherein the amount of coal charged into the boiler is changed
The expression of (a) is:
the application second aspect provides a coal fired boiler unit quick frequency modulation device, includes following module:
the system comprises a first processing module, a second processing module and a control module, wherein the first processing module is used for acquiring a combustion characteristic function according to a unit load-input heat relation of a coal-fired boiler unit, and calculating input heat and a fired coal heat value according to real-time operation data of the coal-fired boiler unit, and the real-time operation data comprises unit power and fired coal amount;
the second processing module is used for acquiring a relation curve of the coal-as-fired quantity and the coal powder quantity of the coal-fired boiler unit and calculating the coal powder as-fired quantity and the coal powder heat value according to the relation curve of the coal-as-fired quantity and the coal powder quantity;
the third processing module is used for acquiring an AGC instruction of a target load, calculating a unit load change rate according to the target load and the current load, and calculating an input heat change rate;
and the coordination control module is used for acquiring a target value of the variation of the coal powder entering the boiler according to the input heat variation rate and adjusting the rotating speed of the dynamic separator, the ventilation quantity of the coal mill and the coal quantity entering the boiler so as to enable the actual coal powder entering the boiler of the coal-fired boiler unit to be equal to the target value of the variation of the coal powder entering the boiler.
Preferably, the first processing module specifically includes:
the first acquisition submodule is used for carrying out a boiler unit variable load test on a coal-fired boiler unit when the coal quality of the boiler is stable to obtain a unit load-input heat relation curve;
a differential submodule for differentiating the relation curve of load-input heat of the unit to obtain a combustion characteristic function f of the unit1Said combustion characteristic function f1The expression of (a) is:
ΔQnet＝f1(ΔP)，
wherein, is Δ QnetFor the rate of change of the input heat into the boiler, Δ P is the rate of change of the load of the boiler unit；
And the first calculation submodule is used for acquiring real-time operation data of the coal-fired boiler unit and calculating input heat and a heat value of coal as fired according to the unit load-input heat relation curve.
Preferably, the second processing module specifically includes:
the second acquisition submodule is used for acquiring the coal powder entering the furnace for moisture test and generating a coal quantity-coal powder quantity relation curve f according to the operation parameters and data analysis of the coal pulverizing system2The relationship curve f of the coal amount entering the furnace and the coal dust amount2The expression of (a) is:
Gmf＝f2(Gm)，
wherein G ismfIn order to obtain the amount of coal powder charged into the furnace, GmThe amount of coal charged into the furnace.
A second calculation submodule for calculating the relationship curve f between the amount of coal fed into the furnace and the amount of pulverized coal2Calculating the amount of coal powder entering the furnace and the heat value of the coal powder, wherein the expression of calculating the heat value of the coal powder is as follows:
Qmf＝Gm×Qnet,ar/Gmf，
wherein Q ismfIs the calorific value, Q, of the coal dustnet,arThe heat value of the coal as fired is obtained.
Preferably, the third processing module specifically includes:
the third acquisition submodule is used for acquiring an AGC instruction to obtain a target load;
the third calculation submodule is used for calculating the change rate of the unit load according to the target load and the current load;
a fourth calculation submodule for calculating the combustion characteristic function f according to the load change rate of the unit1The rate of change of the input heat is calculated.
Preferably, the coordination control module specifically includes:
a first control submodule for calculating a target value delta G of the variation of the pulverized coal entering the furnace according to the input heat variation rate and the pulverized coal heat valuemf,SPThe target value of the variation of the pulverized coal entering the furnace is Delta Gmf,SPThe calculation formula of (2) is as follows:
the second control submodule is used for adjusting the rotating speed of the dynamic separator according to the acquired characteristic function of the dynamic separator and/or adjusting the ventilation of the coal mill to control the variation delta G of the first actual coal powder entering the furnacemf,pv1Regulating the amount of coal charged to control the second actual amount of coal charged to the furnace
So that the first actual pulverized coal entering furnace has a variable quantity delta Gmf,pv1And the second actual amount of change in pulverized coal charged into the furnace
The sum of the total summf,SP；
F of the characteristic function of the dynamic separator3Comprises the following steps:
ΔM1mf＝f3(ΔS)，
wherein, Delta S is the variation of the rotating speed of the dynamic separator, Delta M1mfThe variable quantity of the coal dust entering the furnace is obtained;
the first actual pulverized coal charge variation Δ Gmf,pv1The relational expression of the dynamic separator, the rotating speed and the coal mill ventilation quantity is as follows:
wherein Q is the ventilation rate of the coal mill;
the second actual amount of change in pulverized coal charged into the furnace
According to the relationship curve f of the coal amount entering the furnace and the coal dust amount2And the amount of coal charged into the boiler of the unit is obtained, wherein the amount of coal charged into the boiler is changed
The expression of (a) is:
according to the technical scheme, the embodiment of the application has the following advantages:
the application provides a quick frequency modulation method for a coal-fired boiler unit, which comprises the following steps: 101. acquiring a combustion characteristic function according to a unit load-input heat relation of the coal-fired boiler unit, and calculating input heat and a fired coal heat value according to real-time operation data of the coal-fired boiler unit, wherein the real-time operation data comprises unit power and fired coal amount; 102. acquiring a relation curve of the coal-as-fired quantity and the coal powder quantity of the coal-fired boiler unit, and calculating the coal powder as-fired quantity and the coal powder heat value according to the relation curve of the coal-as-fired quantity and the coal powder quantity; 103. acquiring an AGC instruction of a target load, calculating a unit load change rate according to the target load and the current load, and calculating an input heat change rate; 104. and acquiring a target value of the variation of the pulverized coal entering the boiler according to the variation rate of the input heat, and adjusting the rotating speed of the dynamic separator, the ventilation quantity of the coal mill and the coal entering quantity to ensure that the actual pulverized coal entering the boiler of the coal-fired boiler unit is equal to the target value of the variation of the pulverized coal entering the boiler. According to the method for rapidly modulating the frequency of the coal-fired boiler unit, the combustion characteristic function of the coal-fired boiler unit and the relation curve of the coal amount entering the boiler and the coal amount are obtained, the rotating speed of the dynamic separator, the ventilation quantity of the coal mill and the coal amount entering the boiler are coordinated and controlled according to the AGC instruction with the target load, the actual coal amount entering the boiler of the coal-fired boiler unit can rapidly track the target value of the coal amount changing quantity of the coal entering the boiler, the coal-fired boiler unit can rapidly and accurately respond to the AGC instruction under the condition that boiler combustion and steam temperature wall temperature are stable, the problems that the variable load rate is not high, the adjusting precision is low and the like in the traditional coordination control optimization technology are solved, the defects of a battery energy storage system are overcome, and the requirement of a power grid on.
Drawings
FIG. 1 is a schematic flow chart diagram illustrating an embodiment of a method for fast frequency modulation of a coal-fired boiler unit according to the present disclosure;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a method for rapidly tuning a frequency of a coal-fired boiler unit according to the present application;
fig. 3 is a schematic structural diagram of an embodiment of a rapid frequency modulation device of a coal-fired boiler unit according to the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
For easy understanding, referring to fig. 1, the present application provides an embodiment of a method for fast frequency modulation of a coal-fired boiler unit, including:
102, obtaining a relation curve of the coal amount as fired and the coal powder amount of the coal-fired boiler unit, and calculating the coal powder amount as fired and the coal powder heat value according to the relation curve of the coal amount as fired and the coal powder amount as fired.
And 103, acquiring an AGC instruction of a target load, calculating the change rate of the input heat according to the load change rate of the unit obtained by calculating the target load and the current load.
And 104, acquiring a target value of the variation of the coal powder entering the boiler according to the variation rate of the input heat, and adjusting the rotating speed of the dynamic separator, the ventilation quantity of the coal mill and the coal quantity entering the boiler to enable the actual variation of the coal powder entering the boiler of the coal-fired boiler unit to be equal to the target value of the variation of the coal powder entering the boiler.
It should be noted that in the examples of the present application, the theory of combustion and the combustion are taken as the basisThe characteristic of the coal boiler unit obtains the change rate of the input heat required by the boiler under a certain load change rate of the boiler unit through a test and calculation method. Firstly, acquiring a unit load-input heat relation curve of a coal-fired boiler unit, processing the unit load-input heat relation curve to obtain a unit load change rate-input heat change rate relation curve, namely a combustion characteristic function f1. Obtaining running data of coal-fired boiler unit in real time, such as unit load P and coal amount Gm. Then according to the load P of the unit and the coal quantity G entering the furnacemCalculating input heat Q according to a relation curve of load and input heat of a unitnetHeat value Q of coal as firednet,ar。
Obtaining a relation curve f of coal entering quantity and coal powder quantity of a coal-fired boiler unit2The expression is Gmf＝f2(Gm)，GmfThe unit is t/h for the amount of coal powder entering the furnace. Calculating the amount of coal powder entering the furnace and the heat value of the coal powder according to a relation curve of the amount of coal entering the furnace and the amount of the coal powder, wherein the expression is as follows: qmf＝Gm×Qnet,ar/Gmf。
AGC (Automatic Gain Control) is a basic function in a dispatching automation system, and plays a crucial role in ensuring the frequency quality of a power grid and the exchange power of a tie line to be constant. Two important indexes of the AGC unit are regulation rate and regulation precision, wherein the regulation rate refers to the rate of the unit for responding to load, and the regulation precision refers to the difference between actual output and target output after the output of the unit enters a command control dead zone. In the embodiment of the application, an AGC instruction control mode is adopted to obtain the target load of the coal-fired boiler unit, then the difference value of the target load and the current load of the coal-fired boiler unit is calculated according to the target load to obtain the unit load change rate delta P, and then the combustion characteristic function f is used for obtaining the unit load change rate delta P1Middle delta P and rate of change delta Q of input heat into boilernetThe input heat rate of change is calculated.
The key of influencing the change rate of the load of the coal-fired boiler unit is the combustion of the boiler, the key of the combustion of the boiler is the coal pulverizing system, and only the coal entering the boiler is rapidly increased or decreased through the coal pulverizing systemThe powder volume combines the regulation of boiler amount of wind, just can realize the quick frequency modulation of coal-fired unit, consequently, adopts boiler combustion adjustment technical means in this application embodiment, uses boiler combustion equivalent rapid change to realize the quick variable load of boiler unit. According to input heat quantity change rate delta QnetHeat value Q of pulverized coalmfCalculating to obtain a target value delta G of the variation of the coal dust entering the furnacemf,SP：
Because the change of the coal as fired is converted into the change of the coal as fired with the same amount, the change of the coal as fired has larger delay, and the actual coal as fired change quantity delta G in the embodiment of the application is changed for improving the AGC response speed and the actual coal as fired change quantitymf,pvComprises a first actual coal powder feeding variable quantity delta Gmf,pv1And second actual amount of change of pulverized coal charged into the furnace
Two parts, the first actual charged coal dust variation Δ Gmf,pv1The actual coal powder feeding variable quantity delta G is measured in two waysmf,pvThe pre-adjustment is carried out, one is by adjusting the rotating speed of the dynamic separator, the other is by adjusting the ventilation quantity of the coal mill, the relationship between the rotating speed of the dynamic separator and the variation quantity of the coal powder entering the furnace can be realized by using the characteristic function f of the dynamic separator3Denoted as Δ M1mfF3(Δ S), where Δ S is the dynamic separator speed change, in%, Δ M1mfThe unit is t/h for the variation of the coal powder entering the furnace. First actual pulverized coal charged into the furnace
Quantity Δ Gmf,pv1The relation between the rotating speed of the dynamic separator and the ventilation of the coal mill is as follows:
wherein Q is the ventilation volume of the coal mill, the unit is t/h, and dQ is the ventilation volume variation of the coal mill, and the unit is t/h.
Second actual pulverized coal charged into furnaceAmount of change
According to the relation curve f of the amount of coal entering the furnace and the amount of coal powder2And (6) adjusting.
Due to the short duration of the preconditioning, it is desirable to vary the rate of change Δ Q according to the input heat while preconditioningnetHeat value Q of coal as firednet,arAnd calculating to obtain the change of the coal amount as fired of the unit
Then according to the relation curve f of the amount of coal entering the furnace and the amount of coal powder2Obtaining the second actual charging coal powder variable quantity of the unit
The rotating speed of the dynamic separator, the ventilation quantity of the coal mill and the coal entering quantity are adjusted to ensure that the actual coal entering variation quantity of the coal-fired boiler unit is equal to the target value of the coal entering variation quantity, namely
The accurate control of the unit load can be realized by the quantitative calculation of the boiler combustion equivalent, and overshoot and undershoot are avoided; through the coordination control of the rotation speed adjustment of the dynamic separator and the ventilation adjustment of the coal mill, the load of the unit can be quickly adjusted, the AGC speed is greatly improved, and the load response time is reduced.
According to the method for rapidly modulating the frequency of the coal-fired boiler unit, the combustion characteristic function of the coal-fired boiler unit and the relation curve of the coal amount entering the boiler and the coal amount are obtained, the rotating speed of the dynamic separator, the ventilation rate of the coal mill and the coal amount entering the boiler are coordinated and controlled according to the AGC instruction with the target load, the actual coal amount entering the boiler of the coal-fired boiler unit can rapidly track the target value of the coal amount changing amount of the coal amount entering the boiler, the coal-fired boiler unit can rapidly and accurately respond to the AGC instruction under the condition that boiler combustion and steam temperature wall temperature are stable, the problems of low variable load rate, low adjustment precision and the like of the traditional coordination control optimization technology are solved, the defects of a battery energy storage system are overcome, and the requirement of a power grid on the frequency modulation performance.
For easy understanding, referring to fig. 3, another embodiment of a method for fast frequency modulation of a coal-fired boiler unit is provided in the embodiment of the present application, including:
ΔQnet＝f1(ΔP)，
wherein, is Δ QnetFor the rate of change of the input heat into the boiler, Δ P is the rate of change of the load of the boiler unit.
And 203, acquiring real-time operation data of the coal-fired boiler unit, and calculating input heat and a heat value of coal as fired according to a unit load-input heat relation curve.
204, obtaining the coal powder entering the furnace to carry out moisture assay, and generating a coal quantity-coal powder quantity relation curve f according to the operation parameters and data analysis of a coal pulverizing system2Curve f relating coal quantity to coal powder quantity2The expression of (a) is:
Gmf＝f2(Gm)，
wherein G ismfIn order to obtain the amount of coal powder charged into the furnace, GmThe amount of coal charged into the furnace.
Qmf＝Gm×Qnet,ar/Gmf，
wherein Q ismfIs the calorific value, Q, of the coal dustnet,arThe heat value of the coal as fired is obtained.
And step 206, obtaining an AGC instruction to obtain a target load.
And step 207, calculating the load change rate of the unit according to the target load and the current load.
F of characteristic function of dynamic separator3Comprises the following steps:
ΔM1mf＝f3(ΔS)，
wherein, Delta S is the variation of the rotating speed of the dynamic separator, Delta M1mfThe variable quantity of the coal dust entering the furnace is obtained;
first actual charged pulverized coal variation quantity delta Gmf,pv1The relational expression of the dynamic separator, the rotating speed and the coal mill ventilation quantity is as follows:
second actual amount of change in pulverized coal charged into furnace
According to the relation curve f of the amount of coal entering the furnace and the amount of coal powder2The amount of coal charged into the furnace of the mixing unit is changed, wherein the amount of coal charged into the furnace is changed
The expression of (a) is:
it should be noted that, in the embodiment of the present application, first, when the coal quality of the boiler is stable, a variable load test of the boiler unit is performed to obtain a relationship curve f between load and input heat of the boiler unit1.1：
Qnet＝f1.1(P)，
In the formula: p is unit load, MW; qnetkJ/kg for heat input;
Qnet＝Gm×Qnet,ar，
Gmthe coal charge is t/h; qnet,arkJ/kg as the heat value of the coal as fired.
Then the relation curve f of the load and the input heat of the boiler unit is measured1.1Differentiating to obtain the relation curve of load change rate and input heat change rate, i.e. combustion characteristic function f1。
Taking the coal powder entering the furnace for moisture test, and calculating to obtain a relation curve f between the coal quantity entering the furnace and the coal powder quantity according to the operation parameters of the coal pulverizing system and big data analysis2。
Carrying out dynamic test on the change of the rotating speed of the dynamic separator to obtain a relation curve of the change of the rotating speed of the dynamic separator and the change of the pulverized coal, namely a characteristic function f of the dynamic separator3Expressed as Δ M1mf＝f3(ΔS)。
In obtaining combustionCharacteristic function f1Curve f of relationship between coal quantity fed into furnace and coal powder quantity2And a dynamic separator characteristic function f3On the basis, the rapid and accurate control of the powder making system is carried out, and the control process is described as follows:
acquiring real-time operation data of a boiler unit, such as unit load P and coal charge GmAccording to the relationship curve f of boiler unit load-input heat quantity1.1Calculating input heat QnetHeat value Q of coal as firednet,arAccording to the relationship curve f of the amount of coal entering the furnace and the amount of coal dust2Calculating the amount G of coal powder entering the furnacemfHeat value Q of pulverized coalmf. Obtaining a target load of the coal-fired boiler unit by adopting an AGC instruction control mode, calculating a difference value of the target load and the current load of the coal-fired boiler unit to obtain a unit load change rate delta P, and then according to a combustion characteristic function f1Middle delta P and rate of change delta Q of input heat into boilernetThe input heat rate of change is calculated.
The key that influences the rate of change of coal fired boiler unit load lies in the burning of boiler, and the key of boiler burning lies in the powder process system, only through the quick increase and decrease buggy volume that gets into the boiler of powder process system, combines the regulation of boiler amount of wind, just can realize the quick frequency modulation of coal fired unit, consequently, takes boiler burning adjustment technical means in this application embodiment, uses the quick change of boiler burning equivalent to realize the quick variable load of boiler unit. According to input heat quantity change rate delta QnetHeat value Q of pulverized coalmfCalculating to obtain a target value delta G of the variation of the coal dust entering the furnacemf,SP：
Because the change of the coal as fired is converted into the change of the coal as fired with the same amount, the change of the coal as fired has larger delay, and the actual coal as fired change quantity delta G in the embodiment of the application is changed for improving the AGC response speed and the actual coal as fired change quantitymf,pvComprises a first actual coal powder feeding variable quantity delta Gmf,pv1And second actual amount of change of pulverized coal charged into the furnace
Two parts, the first actual charged coal dust variation Δ Gmf,pv1The actual coal powder feeding variable quantity delta G is measured in two waysmf,pvThe pre-adjustment is carried out, one is by adjusting the rotating speed of the dynamic separator, the other is by adjusting the ventilation quantity of the coal mill, the relationship between the rotating speed of the dynamic separator and the variation quantity of the coal powder entering the furnace can be realized by using the characteristic function f of the dynamic separator3Denoted as Δ M1mfF3(Δ S), where Δ S is the dynamic separator speed change, in%, Δ M1mfThe unit is t/h for the variation of the coal powder entering the furnace. First actual charged pulverized coal variation quantity delta Gmf,pv1The relation between the rotating speed of the dynamic separator and the ventilation of the coal mill is as follows:
wherein Q is the ventilation volume of the coal mill, the unit is t/h, and dQ is the ventilation volume variation of the coal mill, and the unit is t/h.
Second actual amount of change in pulverized coal charged into furnace
According to the relation curve f of the amount of coal entering the furnace and the amount of coal powder2And (6) adjusting.
Due to the short duration of the preconditioning, it is desirable to vary the rate of change Δ Q according to the input heat while preconditioningnetHeat value Q of coal as firednet,arAnd calculating to obtain the coal quantity change delta G of the unitm,pv2：
Then according to the relation curve f of the amount of coal entering the furnace and the amount of coal powder2Obtaining the second actual charging coal powder variable quantity of the unit
The rotating speed of the dynamic separator, the ventilation quantity of the coal mill and the coal entering quantity are adjusted to ensure that the actual coal entering variation quantity of the coal-fired boiler unit is equal to the target value of the coal entering variation quantity, namely
For ease of understanding, referring to fig. 3, an embodiment of a fast frequency modulation device for a coal-fired boiler unit is provided, comprising the following modules:
the first processing module 301 is configured to obtain a combustion characteristic function according to a unit load-input heat relationship of the coal-fired boiler unit, and calculate an input heat and a heat value of coal to be fired according to real-time operation data of the coal-fired boiler unit, where the real-time operation data includes a unit power and a coal to be fired amount.
The second processing module 302 is configured to obtain a relationship curve between the amount of coal entering the furnace and the amount of pulverized coal of the coal-fired boiler unit, and calculate the amount of coal entering the furnace and a calorific value of the pulverized coal according to the relationship curve.
The third processing module 303 is configured to obtain an AGC instruction of a target load, calculate a unit load change rate according to the target load and a current load, and calculate an input heat change rate.
And the coordination control module 304 is configured to obtain a target value of the amount of change of the coal dust entering into the boiler according to the rate of change of the input heat, and adjust the rotating speed of the dynamic separator, the ventilation rate of the coal pulverizer, and the amount of coal entering into the boiler, so that the actual amount of change of coal dust entering into the boiler of the coal-fired boiler unit is equal to the target value of the amount of change of coal dust entering into the boiler.
Further, the first processing module 301 specifically includes:
the first obtaining submodule 3011 is configured to perform a boiler unit variable load test on the coal-fired boiler unit when the quality of the boiler coal is stable, and obtain a unit load-input heat relation curve.
A derivative sub-module 3012, configured to differentiate a relationship curve between load and input heat of the unit to obtain a combustion characteristic function f of the unit1Combustion characteristic function f1The expression of (a) is:
ΔQnet＝f1(ΔP)，
wherein, is Δ QnetFor the rate of change of the input heat into the boiler, Δ P is the rate of change of the load of the boiler unit.
And the first calculating submodule 3013 is configured to obtain real-time operation data of the coal-fired boiler unit, and calculate an input heat and a heat value of coal as fired according to a unit load-input heat relation curve.
Further, the second processing module 302 specifically includes:
the second obtaining submodule 3021 is configured to obtain the coal powder entering the furnace for moisture analysis, and generate a relationship curve f between the coal amount entering the furnace and the coal powder amount according to the operational parameters and data analysis of the coal pulverizing system2Curve f relating coal quantity to coal powder quantity2The expression of (a) is:
Gmf＝f2(Gm)，
wherein G ismfIn order to obtain the amount of coal powder charged into the furnace, GmThe amount of coal charged into the furnace.
A second calculating submodule 3022 for calculating the relationship curve f between the amount of coal charged and the amount of pulverized coal2Calculating the amount of coal powder entering the furnace and the heat value of the coal powder, wherein the expression of calculating the heat value of the coal powder is as follows:
Qmf＝Gm×Qnet,ar/Gmf，
wherein Q ismfIs the calorific value, Q, of the coal dustnet,arThe heat value of the coal as fired is obtained.
Further, the third processing module 303 specifically includes:
and a third obtaining submodule 3031, configured to obtain an AGC instruction, so as to obtain a target load.
And a third calculating submodule 3032, configured to calculate a unit load change rate according to the target load and the current load.
A fourth calculation submodule 3033 for calculating the function f according to the rate of change of the load of the unit and the combustion characteristics1The rate of change of the input heat is calculated.
Further, the coordination control module 304 specifically includes:
a first control submodule 3041 for calculating coal as fired according to the input heat change rate and the pulverized coal calorific valueTarget value of powder variation Δ Gmf,SPTarget value Δ G of variation of pulverized coal charged into furnacemf,SPThe calculation formula of (2) is as follows:
a second control submodule 3042, configured to adjust the rotation speed of the dynamic separator according to the obtained characteristic function of the dynamic separator, and/or adjust the ventilation of the coal mill to control the variation Δ G of the first actual coal powder entering the furnacemf,pv1Regulating the amount of coal charged to control the second actual amount of coal charged to the furnace
So that the first actual pulverized coal entering the furnace has the variable quantity delta Gmf,pv1And second actual amount of change of pulverized coal charged into the furnace
The sum of the totalmf,SP；
F of characteristic function of dynamic separator3Comprises the following steps:
ΔM1mf＝f3(ΔS)，
wherein, Delta S is the variation of the rotating speed of the dynamic separator, Delta M1mfThe variable quantity of the coal dust entering the furnace is obtained;
first actual charged pulverized coal variation quantity delta Gmf,pv1The relational expression of the dynamic separator, the rotating speed and the coal mill ventilation quantity is as follows:
second actual amount of change in pulverized coal charged into furnace
Relation curve f of coal amount entering furnace and coal powder amount2The amount of coal charged into the furnace of the mixing unit is changed, wherein the amount of coal charged into the furnace is changed
The expression of (a) is:
in the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A quick frequency modulation method for a coal-fired boiler unit is characterized by comprising the following steps:
101. acquiring a combustion characteristic function according to a unit load-input heat relation of a coal-fired boiler unit, and calculating input heat and a fired coal heat value according to real-time operation data of the coal-fired boiler unit, wherein the real-time operation data comprises unit power and fired coal amount;
102. acquiring a relation curve of the coal-as-fired quantity and the coal powder quantity of the coal-fired boiler unit, and calculating the coal powder as-fired quantity and the coal powder heat value according to the relation curve of the coal-as-fired quantity and the coal powder quantity;
103. acquiring an AGC instruction of a target load, calculating a unit load change rate according to the target load and the current load, and calculating an input heat change rate;
104. acquiring a target value of the variation of the pulverized coal entering the boiler according to the variation rate of the input heat, and adjusting the rotating speed of a dynamic separator, the ventilation quantity of a coal mill and the coal entering quantity to ensure that the actual pulverized coal entering the boiler of the coal-fired boiler unit is equal to the target value of the variation of the pulverized coal entering the boiler;
step 104 specifically includes:
1041. calculating the target value delta G of the variation of the coal dust entering the furnace according to the input heat variation rate and the coal dust heat valuemf,SPThe target value of the variation of the pulverized coal entering the furnace is Delta Gmf,SPThe calculation formula of (2) is as follows:
1042. adjusting the rotating speed of the dynamic separator according to the obtained characteristic function of the dynamic separator, and/or adjusting the ventilation of the coal mill to control the variation delta G of the first actual coal powder entering the furnacemf,pv1Regulating the amount of coal charged to control the second actual amount of coal charged to the furnace
So that the first actual pulverized coal entering furnace has a variable quantity delta Gmf,pv1And the second actual amount of change in pulverized coal charged into the furnace
The sum of the total summf,SP；
F of the characteristic function of the dynamic separator3Comprises the following steps:
ΔM1mf＝f3(ΔS)，
wherein, Delta S is the variation of the rotating speed of the dynamic separator, Delta M1mfThe variable quantity of the coal dust entering the furnace is obtained;
the first actual pulverized coal charge variation Δ Gmf,pv1The relational expression of the dynamic separator, the rotating speed and the coal mill ventilation quantity is as follows:
wherein Q is the ventilation rate of the coal mill;
the second actual amount of change in pulverized coal charged into the furnace
According to the relationship curve f of the coal amount entering the furnace and the coal dust amount2And the amount of coal charged into the boiler of the unit is obtained, wherein the amount of coal charged into the boiler is changed
The expression of (a) is:
2. the method for fast frequency modulation of a coal-fired boiler unit according to claim 1, wherein the step 101 specifically comprises:
1011. when the coal quality of the boiler is stable, carrying out a variable load test on the boiler unit of the coal burning boiler to obtain a unit load-input heat relation curve;
1012. differentiating the relation curve of the unit load and the input heat to obtain a combustion characteristic function f of the unit1Said combustion characteristic function f1The expression of (a) is:
ΔQnet＝f1(ΔP)，
wherein, is Δ QnetThe change rate of input heat entering the boiler is delta P, and the delta P is the load change rate of the boiler unit;
1013. and acquiring real-time operation data of the coal-fired boiler unit, and calculating input heat and a heat value of coal as fired according to the unit load-input heat relation curve.
3. The method for fast frequency modulation of a coal-fired boiler unit according to claim 2, wherein the step 102 specifically comprises:
1021. obtaining the coal powder entering the furnace to carry out moisture assay, and generating a relationship curve f of the coal quantity entering the furnace and the coal powder quantity according to the operation parameters and data analysis of a coal pulverizing system2The relationship curve f of the coal amount entering the furnace and the coal dust amount2The expression of (a) is:
Gmf＝f2(Gm)，
wherein G ismfIn order to obtain the amount of coal powder charged into the furnace, GmThe amount of coal charged into the furnace;
1022. according to the relationship curve f of the coal amount entering the furnace and the coal dust amount2Calculating the amount of coal powder entering the furnace and the heat value of the coal powder, wherein the expression of calculating the heat value of the coal powder is as follows:
Qmf＝Gm×Qnet,ar/Gmf，
wherein Q ismfIs the calorific value, Q, of the coal dustnet,arThe heat value of the coal as fired is obtained.
4. The method for fast frequency modulation of a coal-fired boiler unit according to claim 3, wherein the step 103 specifically comprises:
1031. obtaining an AGC instruction to obtain a target load;
1032. calculating the load change rate of the unit according to the target load and the current load;
1033. according to the unit load change rate and the combustion characteristic function f1The rate of change of the input heat is calculated.
5. The utility model provides a coal fired boiler unit quick frequency modulation device which characterized in that includes following module:
the system comprises a first processing module, a second processing module and a control module, wherein the first processing module is used for acquiring a combustion characteristic function according to a unit load-input heat relation of a coal-fired boiler unit, and calculating input heat and a fired coal heat value according to real-time operation data of the coal-fired boiler unit, and the real-time operation data comprises unit power and fired coal amount;
the second processing module is used for acquiring a relation curve of the coal-as-fired quantity and the coal powder quantity of the coal-fired boiler unit and calculating the coal powder as-fired quantity and the coal powder heat value according to the relation curve of the coal-as-fired quantity and the coal powder quantity;
the third processing module is used for acquiring an AGC instruction of a target load, calculating a unit load change rate according to the target load and the current load, and calculating an input heat change rate;
the coordination control module is used for acquiring a target value of the variation of the coal powder entering the boiler according to the input heat variation rate, and adjusting the rotating speed of a dynamic separator, the ventilation quantity of a coal mill and the coal quantity entering the boiler so as to enable the actual coal powder entering the boiler of the coal-fired boiler unit to be equal to the target value of the variation of the coal powder entering the boiler;
the coordination control module specifically comprises:
a first control submodule for calculating a target value delta G of the variation of the pulverized coal entering the furnace according to the input heat variation rate and the pulverized coal heat valuemf,SPThe target value of the variation of the pulverized coal entering the furnace is Delta Gmf,SPThe calculation formula of (2) is as follows:
the second control submodule is used for adjusting the rotating speed of the dynamic separator according to the acquired characteristic function of the dynamic separator and/or adjusting the ventilation of the coal mill to control the variation delta G of the first actual coal powder entering the furnacemf,pv1Regulating the amount of coal charged to control the second actual amount of coal charged to the furnace
So that the first actual pulverized coal entering furnace has a variable quantity delta Gmf,pv1And the second actual amount of change in pulverized coal charged into the furnace
The sum of the total summf,SP；
F of the characteristic function of the dynamic separator3Comprises the following steps:
ΔM1mf＝f3(ΔS)，
wherein, Delta S is the variation of the rotating speed of the dynamic separator, Delta M1mfThe variable quantity of the coal dust entering the furnace is obtained;
the first actual pulverized coal charge variation Δ Gmf,pv1The relational expression of the dynamic separator, the rotating speed and the coal mill ventilation quantity is as follows:
wherein Q is the ventilation rate of the coal mill;
the second actual amount of change in pulverized coal charged into the furnace
According to the relationship curve f of the coal amount entering the furnace and the coal dust amount2And the amount of coal charged into the boiler of the unit is obtained, wherein the amount of coal charged into the boiler is changed
The expression of (a) is:
6. the coal-fired boiler unit fast frequency modulation device according to claim 5, wherein the first processing module specifically comprises:
the first acquisition submodule is used for carrying out a boiler unit variable load test on a coal-fired boiler unit when the coal quality of the boiler is stable to obtain a unit load-input heat relation curve;
a differential submodule for differentiating the relation curve of load-input heat of the unit to obtain a combustion characteristic function f of the unit1Said combustion characteristic function f1The expression of (a) is:
ΔQnet＝f1(ΔP)，
wherein, is Δ QnetThe change rate of input heat entering the boiler is delta P, and the delta P is the load change rate of the boiler unit;
and the first calculation submodule is used for acquiring real-time operation data of the coal-fired boiler unit and calculating input heat and a heat value of coal as fired according to the unit load-input heat relation curve.
7. The coal-fired boiler unit fast frequency modulation device according to claim 6, wherein the second processing module specifically comprises:
the second acquisition submodule is used for acquiring the coal powder entering the furnace for moisture test and generating a coal quantity-coal powder quantity relation curve f according to the operation parameters and data analysis of the coal pulverizing system2The relationship curve f of the coal amount entering the furnace and the coal dust amount2The expression of (a) is:
Gmf＝f2(Gm)，
wherein G ismfIn order to obtain the amount of coal powder charged into the furnace, GmThe amount of coal charged into the furnace;
a second calculation submodule for calculating the relationship curve f between the amount of coal fed into the furnace and the amount of pulverized coal2Calculating the amount of coal powder entering the furnace and the heat value of the coal powder, wherein the expression of calculating the heat value of the coal powder is as follows:
Qmf＝Gm×Qnet,ar/Gmf，
wherein Q ismfIs the calorific value, Q, of the coal dustnet,arThe heat value of the coal as fired is obtained.
8. The coal-fired boiler unit fast frequency modulation device according to claim 7, wherein the third processing module specifically comprises:
the third acquisition submodule is used for acquiring an AGC instruction to obtain a target load;
the third calculation submodule is used for calculating the change rate of the unit load according to the target load and the current load;
a fourth calculation submodule for calculating the combustion characteristic function f according to the load change rate of the unit1The rate of change of the input heat is calculated.
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