WO2018212224A1 - Boiler combustion control system and boiler combustion control method - Google Patents
Boiler combustion control system and boiler combustion control method Download PDFInfo
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- WO2018212224A1 WO2018212224A1 PCT/JP2018/018877 JP2018018877W WO2018212224A1 WO 2018212224 A1 WO2018212224 A1 WO 2018212224A1 JP 2018018877 W JP2018018877 W JP 2018018877W WO 2018212224 A1 WO2018212224 A1 WO 2018212224A1
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- fuel
- boiler
- reference curve
- amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
Definitions
- the present invention relates to a technology for controlling combustion of a boiler, and more particularly to a technology effective when applied to a boiler combustion control system and a boiler combustion control method for determining a fuel input amount to a boiler based on a required load amount of the boiler. Is.
- fuel solid fuel, liquid fuel, or gaseous fuel
- the heat is absorbed by the heat exchanger, and the steam is Generate heat energy.
- the generated steam is converted from thermal energy into rotational motion by being supplied to a steam turbine, for example, and used for power generation by a generator.
- the amount of fuel input to the boiler is a load requirement amount (for example, a power generation requirement amount MWD (Mega Watt Demand), and may be referred to as a load requirement amount MWD in the following), and a fuel injection amount (hereinafter referred to as a fuel requirement amount MWD).
- the fuel function FX which is a relational expression between the boiler input command value BID (may be described as Boiler Input Demand).
- Patent Document 1 As a technique related to this, for example, in Japanese Patent No. 4522326 (Patent Document 1), a plurality of ratios or differences between values before and after feedback correction are sequentially updated and stored, and the stored multiple values are used. It is described that a fuel correction coefficient is obtained and a value after feedback correction is corrected by this correction coefficient. Thus, it is possible to correct the fuel injection amount in consideration of changes in the thermal efficiency of the boiler due to the influence of various factors.
- Patent Document 2 a fuel correction coefficient for correcting a value after feedback correction is subdivided into three elements in a multiple-type fuel mixed combustion boiler. It is described that the amount of fuel input to the boiler is corrected in accordance with the difference in unit calorific value and the difference in boiler thermal efficiency due to the change in the mixed combustion rate.
- the value of the load request amount MWD before and after the feedback correction is compared as needed for changes in the thermal efficiency of the boiler due to the influence of various factors. It is possible to determine this by measuring, and acquire the value of the correction coefficient for further correcting and optimizing the value after feedback correction based on the determination result by self-learning.
- the fuel function FX that defines the relationship between the required load amount MWD and the corresponding boiler input command value BID as a function (curve) is set reflecting the characteristics of the boiler. These are set as fixed values calculated in advance based on the accumulation of past actual measurement data. However, the behavior of the main steam pressure based on the characteristics of the boiler is different for each boiler, and even in one boiler, it can be changed by updating the boiler equipment. That is, there may be a slight difference between the actual behavior of the main vapor pressure and the expected value (optimum value) assumed in the fuel function FX. This divergence becomes a divergence from the optimum value of the fuel input amount, destabilizes the combustion control process of the boiler, and results in energy loss.
- an object of the present invention is to detect a deviation from the optimum value assumed by the fuel function FX in the behavior of the main vapor pressure, and to correct the fuel function FX autonomously and self-containedly. And providing a boiler combustion control method.
- a boiler combustion control system supplies a fuel related to a fuel input amount to a boiler, which is calculated based on a predetermined fuel function with respect to a load requirement amount, and is measured. Further, a feedback correction amount is obtained based on a measured main steam pressure that is the main steam pressure of the boiler and a set main steam pressure that is a main steam pressure of the boiler that is set in advance, and the load is determined based on the feedback correction amount.
- a boiler combustion control system that outputs a fuel correction coefficient for correcting the load request amount or the fuel input amount after the feedback correction to a plant that corrects the required amount or the fuel input amount, wherein the feedback correction
- a fuel correction coefficient calculation unit that calculates the fuel correction coefficient based on a fine adjustment function, and a reference curve correction unit that outputs a reference curve correction coefficient that corrects the initial value and the fine adjustment function. is there.
- the reference curve correction unit includes a deviation determination unit that calculates a deviation between the measured main vapor pressure and the set main vapor pressure, a cycle determination unit that acquires and records a cycle related to the variation in the deviation, An amplitude determination unit that acquires and records an amplitude related to a variation in deviation, a reference curve correction coefficient output unit that calculates and outputs the reference curve correction coefficient based on a predetermined reference curve correction function, the period and the amplitude A reference curve fuel function correction determination unit that corrects the reference curve correction function based on a control state for the boiler when the combination is satisfied. Have.
- the deviation from the optimum value assumed by the fuel function FX in the behavior of the main vapor pressure is detected, and the fuel function FX is corrected autonomously and self-contained. Is possible.
- the ratio of the required load amount MWD before and after performing feedback correction that is, feedback of the main steam pressure.
- a fuel correction coefficient is obtained by self-learning based on an index indicating the correction operation level, and the load request amount MWD (or boiler input command value BID) is further corrected by this fuel correction coefficient. This correction can be said to be substantially equivalent to correcting the fuel function FX.
- the boiler combustion control system corrects the reference curve that is the basis and starting point of self-learning by AI (Artificial Intelligence) in order to further improve the accuracy with respect to the above-described conventional technology.
- This reference curve shows the initial value of the relationship between the required load amount MWD defined for the target boiler and the boiler input command value BID.
- this reference curve is set as a fixed value calculated in advance based on the accumulation of past actual measurement data, like the fuel function FX. In this case, depending on the equipment update of the boiler and other changes in the state, the behavior of the main steam pressure slightly deviates from the optimum value assumed in the fuel function FX corrected by the fuel correction coefficient, and the combustion control of the boiler is performed. The process may become unstable and efficiency may be reduced.
- the behavior / state change of the main steam pressure of the boiler is constantly analyzed and determined based on past data, and the above reference curve is adjusted based on the determination result By doing so, a slight deviation occurring in the fuel function FX is corrected.
- this series of processing is performed autonomously and in real time by a self-contained processing loop.
- ⁇ System configuration> 1 is a diagram showing an outline of a configuration example of a boiler combustion control system according to Embodiment 1 of the present invention.
- the boiler combustion control system 1 determines the fuel correction coefficient K by adjusting the reference curve using the initial value and the fine adjustment function FXAI so that the amount of fuel input to the boiler 2 in the plant is optimized.
- the control information is output to an existing circuit or the like that inputs fuel into the boiler 2 (that is, the combustion of the boiler 2 is controlled by substantially correcting the fuel function FX).
- the boiler combustion control system 1 may be configured as, for example, a device that is implemented by hardware including a semiconductor circuit (not shown), a microcomputer, and the like that executes processing related to each function described below. Alternatively, it is composed of general-purpose server devices, virtual servers built on cloud computing services, etc., and expanded on memory from a recording device such as HDD (Hard Disk Drive) by a CPU (Central Processing Unit) (not shown) By executing middleware such as an OS (Operating System) or software operating on the middleware, processing related to each function described later may be executed.
- middleware such as an OS (Operating System) or software operating on the middleware
- the configuration is not limited to a configuration in which the entirety is mounted in one casing, and a configuration in which some functions are mounted in another casing and the casings are mutually connected by a communication cable or the like may be used. That is, the implementation form of the boiler combustion control system 1 is not particularly limited, and can be configured flexibly as appropriate according to the plant environment and the like.
- the boiler combustion control system 1 includes various units such as a division unit 11, a reference curve correction unit 12, a multiplication unit 13, and a fuel correction coefficient calculation unit 14 that are implemented by hardware or software.
- various units such as a division unit 11, a reference curve correction unit 12, a multiplication unit 13, and a fuel correction coefficient calculation unit 14 that are implemented by hardware or software.
- files such as files and tables recorded in a memory, HDD, etc., and data such as fine adjustment functions FXAI.
- the main steam generated by burning the fuel in the boiler 2 based on the information of the fuel input amount (boiler input command value BID in the figure) is supplied to the steam turbine 3, for example, by a generator (not shown) Used for power generation.
- the required load amount MWD (input steam required amount) of the boiler 2 corresponding to the output from the generator is input, for example, by an operation panel (not shown) in the boiler 2 and also input to the boiler combustion control system 1.
- the pressure of the main steam generated in the boiler 2 is measured by a pressure gauge (not shown) provided in the boiler 2, and the measured value is input to the main steam pressure transmitter PX.
- the measured main steam pressure PV transmitted from the main steam pressure transmitter PX is input to the PID control unit 4 and is compared with the set main steam pressure SV which is the main steam pressure that should be originally in the PID control unit 4. Is called.
- the fuel input amount is determined using the fuel function FX obtained under the conditions in which the state of the boiler 2 (furnace fouling, etc.), fuel properties, and other factors are maintained, measurement is performed.
- a difference between the main steam pressure PV and the set main steam pressure SV hardly occurs, and a desired load (generator output) is obtained by the fuel function FX.
- a pressure difference may occur between the measured main steam pressure PV and the set main steam pressure SV with changes in the state of the boiler 2, changes in fuel properties, and other factors. is there.
- the PID control unit 4 when a pressure difference between the measured main steam pressure PV and the set main steam pressure SV is detected, it is generated by a feedback correction amount, that is, a fuel shortage (or excess) by a known PID control technique. A deviation (error amount) of the main vapor pressure is calculated and sent to the adding unit 5.
- the adding unit 5 adds the feedback correction amount sent from the PID control unit 4 to the load request amount MWD that is also input to the boiler combustion control system 1, so that the load request amount MWD ′ (boiler input after the feedback correction) is added.
- (Command value BID ′) is output (the PID control unit 4 and the addition unit 5 may be described as a feedback control unit).
- the output fuel correction coefficient K is multiplied by the load request amount MWD ′ (boiler input command value BID ′) by the multiplier 6.
- the corrected load requirement amount MWD ′′ (boiler input command value BID ′′) is input, and the fuel input amount calculation unit 7 converts this into a boiler input command value BID by the fuel function FX.
- the injection of fuel into the boiler 2 is controlled based on this boiler input command value BID.
- the reference curve correction unit 12 always performs comparative measurement between the measured main steam pressure PV of the boiler 2 and the set main steam pressure SV, which is a set value that should be supposed to be, so that the main A change in vapor pressure behavior is analyzed and determined, and a reference curve correction coefficient KP is set based on the determination result. Then, the initial value and the initial value of the reference curve defined in the fine adjustment function FXAI are corrected in real time by multiplying the initial value and the fine adjustment function FXAI by the multiplication unit 13.
- FIG. 4 is a diagram showing an outline of an example of the behavior of the main vapor pressure.
- Each of the diagrams shows a curve of an example of the change in the measured main steam pressure PV over time, and also shows the set main steam pressure SV in a straight line.
- the upper diagram shows a case where the degree of correction (correction by the fuel correction coefficient K and integral correction by PID control) is set strongly, and the measured main steam pressure PV varies greatly across the set main steam pressure SV. It shows that.
- the middle diagram shows a case where the degree of correction is optimal, and shows that the measured main steam pressure PV fluctuates in the vicinity of the set main steam pressure SV.
- the lower diagram shows a case where the degree of correction is set to be weak, and the measured main vapor pressure PV fluctuates greatly slowly across the set main vapor pressure SV as a whole while repeating small fluctuations. It is shown that.
- the behavior of the main steam pressure is centered on the vibration of the measured main steam pressure PV based on the set main steam pressure SV, that is, the set main steam pressure SV. It grasps
- the state in which the main vapor pressure (measured main vapor pressure PV) is optimal basically refers to a state in which the amplitude is small and the cycle is short, as shown in the middle diagram.
- the state with a long period means that the state in which the measured main vapor pressure PV is away from the set main vapor pressure SV continues for a long period of time as shown in the lower diagram.
- the measured main vapor pressure PV is oscillated with a small amplitude around the set main vapor pressure SV.
- a pressure difference may occur between the measured main steam pressure PV and the set main steam pressure SV with changes in the state of the boiler 2, changes in fuel properties, and other factors.
- this deviation is measured to detect a state where the measured main vapor pressure PV is in an optimum state, that is, a state where the amplitude and period values are small, and the fuel function is based on the state at that time.
- a correction coefficient for FX (in this embodiment, an initial value and a fuel function correction coefficient KP for fine adjustment function FXAI) is calculated.
- FIG. 2 is a diagram showing an outline of a configuration example of the reference curve correction unit 12 in the present embodiment.
- the reference curve correction unit 12 further includes, as its configuration, a deviation determination unit 121, a period determination unit 122, an amplitude determination unit 123, a reference curve correction determination unit 124, and a reference curve correction coefficient output implemented by hardware or software. Each part such as the part 125 is included.
- the data includes a period history 126, amplitude history 127, optimum value information 128, reference curve correction function VFX, and the like implemented as files or tables recorded in a memory, HDD, or the like.
- the measured main steam pressure PV and the set main steam pressure SV input to the reference curve correction unit 12 are input to the deviation determination unit 121, and the difference (deviation) is calculated.
- the calculated difference is input to the period determination unit 122 and the amplitude determination unit 123, respectively, and the period and amplitude of the fluctuation are calculated as information characterizing the behavior of the measurement main vapor pressure PV.
- the behavior of the measurement main vapor pressure PV is not constant but changes every moment. Therefore, the period and the amplitude are calculated as a moving average over a long time (for example, 30 minutes). For this reason, the calculated period and amplitude information are recorded in a memory, HDD, or the like as the period history 126 and the amplitude history 127, respectively.
- the calculated period and amplitude values are input to the reference curve correction determination unit 124.
- the reference curve correction determination unit 124 it is determined whether or not the values of the period and the amplitude are optimum values (including a suitable value within a certain range corresponding thereto).
- the information related to the optimum value is recorded as, for example, the optimum value information 128 in a memory or HDD.
- the value of the reference curve correction function VFX set as a variable function is moved until the period and the amplitude are out of the optimum state.
- the reference curve correction coefficient output unit 125 acquires and outputs a reference curve correction coefficient KP corresponding to the load requirement amount MWD.
- the reference curve correction coefficient KP is multiplied by the initial value and the fine adjustment function FXAI to correct the initial value and the fine adjustment function FXAI.
- FIG. 3 is a flowchart showing an example of a flow of processing for correcting the initial value and the fine adjustment function FXAI in the present embodiment.
- the flow of processing up to the part where the reference curve correction function VFX is set in the reference curve correction determination unit 124 of the reference curve correction unit 12 is shown.
- the reference curve correction coefficient output unit 125 of the reference curve correction unit 12 acquires and outputs a reference curve correction coefficient KP corresponding to the load requirement amount MWD based on the set reference curve correction function VFX.
- the deviation determination unit 121 acquires the set main vapor pressure SV (S01).
- the set main steam pressure SV may be preset in the system as a constant as shown in FIG. 1, or may be acquired as an external input from the boiler 2 or the like.
- the measurement main vapor pressure PV transmitted from the main vapor pressure transmitter PX is acquired (S02).
- the above processing order is an example, and may be executed in reverse order or in parallel.
- a deviation process for obtaining a difference between them is performed (S03).
- the deviation determination unit 121 inputs the calculated difference information to the period determination unit 122 and the amplitude determination unit 123, respectively, and returns to step S01 to continue the process.
- the cycle determining unit 122 measures the fluctuation cycle of the measured main steam pressure PV based on the set main steam pressure SV based on the information on the difference in main steam pressure acquired from the deviation determining unit 121 (S11). For example, the timing at which the sign of the difference is reversed is grasped based on the history information of the past difference stored in a memory or the like (not shown), and the time interval is set as the period. As described above, the behavior of the measured main vapor pressure PV is not constant and changes every moment. Therefore, the period is calculated as a moving average based on a past long time (for example, 30 minutes) history. Thereafter, it is determined whether or not the measured cycle is normal (is not an abnormal value such as minus) (S12). If it is not normal (is an abnormal value) (S12: N), the process returns to step S11 to continue the cycle measurement process.
- the amplitude determination unit 123 measures the amplitude of fluctuation in the measured main steam pressure PV based on the set main steam pressure SV based on the difference information of the main steam pressure acquired from the deviation determination unit 121 ( S21). For example, the absolute value of the difference is grasped as the amplitude. The amplitude is also calculated as a moving average of history information for the past long time (for example, 30 minutes). Thereafter, it is determined whether or not the measured amplitude is normal (S22). If not normal (S22: N), the process returns to step S21 to continue the amplitude measurement process.
- the reference curve correction determination unit 124 acquires a transition of a cycle within a past fixed time range (for example, 5 minutes) (S31), and determines whether each cycle is within a predetermined range (S32). ). If it does not fall within the predetermined range (S32: N), nothing is done, or if the correction process for the reference curve correction function VFX has already been performed, this is ended (S38). Thereby, the reference curve correction coefficient output unit 125 at the subsequent stage acquires and outputs the reference curve correction coefficient KP based on the reference curve correction function VFX at this time.
- a past fixed time range for example, 5 minutes
- the period within the past fixed time range is within the predetermined range (S32: Y)
- whether or not the measured period and amplitude are the minimum values so far in the past fluctuation history. Is determined (S33).
- the minimum value information so far may be recorded in the optimum value information 128, for example.
- step S35 it is determined whether the combination of the measured period and amplitude is the optimum value.
- a method for determining which is the optimum value for example, an appropriate method can be used, for example, it is assumed that the smaller value of the period is optimum while the amplitude value is within a predetermined range. If the measured combination of period and amplitude is not the optimum value (S35: N), nothing is done, or if the correction process for the reference curve correction function VFX has already been performed, this is ended (S38).
- the reference curve correction function VFX is set as a variable function that defines a curve of a correspondence relationship between the load requirement amount MWD and the reference curve correction coefficient KP that is a correction coefficient for the initial value and the fine adjustment function FXAI. Correction is made by moving a predetermined amount. This correction is continued until, for example, the measured period and amplitude deviate from the optimum state. Note that such a correction method is an example.
- the reference curve correction function VFX is used by using another index such as the boiler input command value BID in the control state when the combination of the measured period and amplitude is the optimum value.
- a method of correcting the initial value and the fine adjustment function FXAI may be used.
- the deviation of the variation of the measured main steam pressure PV from the set main steam pressure SV is measured as a period and an amplitude, and the length Based on the transition of time, the timing at which the period and amplitude are in the optimum state is specified. Then, a reference curve correction coefficient KP for correcting the fuel function FX (specifically, the initial value and the fine adjustment function FXAI in the present embodiment) is output based on the state when the period and the amplitude are optimal. That is, it is possible to substantially correct a slight deviation occurring in the fuel function FX in real time autonomously and self-containedly.
- a boiler combustion control system applicable to a supercritical pressure once-through boiler or a super supercritical pressure once-through boiler will be described.
- the amount of fuel input and the amount of water supplied in the supercritical pressure once-through boiler and the super supercritical pressure once-through boiler depend on the main steam pressure and the water / fuel ratio.
- the water / fuel ratio is a value defined by the weight ratio of the amount of water supplied to the boiler and the fuel.
- This water-fuel ratio is controlled by a water-fuel ratio master provided outside the boiler combustion control system.
- the water-fuel ratio master adjusts the fuel input amount while performing integration processing according to the amount of heat (main vapor pressure).
- the fuel input amount cannot be controlled properly, and combustion is stabilized. I could not.
- an object of the present embodiment is to provide a boiler combustion control system that can appropriately control the amount of fuel input in a supercritical pressure once-through boiler or a super supercritical pressure once-through boiler.
- FIG. 5 is a diagram showing an outline of a configuration example of the boiler combustion control system according to Embodiment 2 of the present invention.
- the configuration other than the boiler combustion control system 201 in the present embodiment is a configuration in which a water supply master 208, a water-fuel ratio master 209, and an adding unit 210 are added to FIG.
- the water-fuel ratio master 209 is configured so that a boiler input command value BID, a water-fuel ratio defined by a weight ratio of water (liquid) supplied to the boiler 2 and fuel becomes a predetermined value (or within a predetermined range). BID '(load required amount MWD') and water supply amount are adjusted. By these controls, the water-fuel ratio master 209 controls the amount of water supply, the fluid temperature in the pipe, and the surface temperature of the pipe. The water-fuel ratio master 209 generates a water-fuel ratio master signal based on the measured value of the main steam pressure PV measured by a pressure gauge (not shown) and information such as the amount of water supply, and outputs the generated water-fuel ratio master signal.
- the water / fuel ratio master signal is a signal related to increase / decrease of the fuel input amount.
- the water / fuel ratio master signal is a positive signal for increasing the fuel input amount, and when the fuel is excessive, the signal is a negative signal for decreasing the fuel input amount. .
- the water supply master 208 adjusts the amount of water supplied to the boiler 2 based on the required load amount MWD, the set value of the water / fuel ratio, and the like.
- the adding unit 210 adjusts the boiler input command value BID output from the fuel injection amount calculating unit 7 based on the water / fuel ratio master signal output from the water / fuel ratio master 209.
- the boiler combustion control system 201 further controls the fuel input amount. Control is performed. As shown in FIG. 5, the boiler combustion control system 201 has a configuration in which an adding unit 215 is added to the boiler combustion control system 1 of FIG. 1. The adding unit 215 is connected to the water-fuel ratio master 209, and based on the water-fuel ratio master signal output from the water-fuel ratio master 209, the boiler input command value BID ′ (load request amount) after feedback adjustment output from the adding unit 5 The value of MWD ′) is adjusted.
- Adder 215 performs signal processing to add a predetermined value to boiler input command value BID ′ if the water-fuel ratio master signal is a positive signal, and boiler input command value BID if the water-fuel ratio master signal is a negative signal. Perform signal processing to subtract a predetermined value from '. Then, the adding unit 215 outputs the boiler input command value BID ′ (load request amount MWD ′) after the signal processing to the dividing unit 11.
- the division unit 11 calculates a ratio between the load request amount MWD and the boiler input command value BID ′ after the signal processing, and outputs the ratio to the fuel correction coefficient calculation unit 14.
- the fuel correction coefficient calculation unit 14 calculates the fuel correction coefficient K based on the boiler input command value BID ′ after signal processing by self-learning using the ratio output from the division unit 11 as input. Note that the processes in the reference curve correction unit 12 and the multiplication unit 13 are the same as those in the first embodiment.
- the fuel correction coefficient K based on the control of the water / fuel ratio master 209 is multiplied by the load request amount MWD ′ (boiler input command value BID ′) by the multiplier 6.
- the fuel input amount calculation unit 7 converts this into a boiler input command value BID by the fuel function FX and outputs it to the addition unit 210.
- the processing in the adding unit 210 is as described above.
- the fuel correction coefficient calculation unit 14 includes the load requirement amount MWD before feedback correction and the load requirement amount MWD ′ after feedback correction adjusted based on the water / fuel ratio (boiler input command value BID ′).
- the fuel correction coefficient K is calculated based on the ratio of According to this configuration, it is possible to calculate an appropriate fuel correction coefficient K based on the control of the water-fuel ratio master 209, so that the fuel input amount is appropriately controlled even in a supercritical pressure once-through boiler or a super supercritical pressure once-through boiler.
- a boiler combustion control system and the like are provided.
- the influence of the water / fuel ratio master 209 can be determined by calculation, the weight of the boiler input command value BID and the control by the water / fuel ratio master 209 can be calculated, and stable combustion can be performed. It has become possible.
- the present invention made by the present inventor has been specifically described based on the embodiments.
- the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.
- the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the configurations described.
- each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit.
- Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor.
- Information such as programs, tables, and files for realizing each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.
- control lines and information lines indicate what is considered necessary for explanation, and not all control lines and information lines on mounting are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.
- the present invention can be used in a boiler combustion control system and a boiler combustion control method that determine the amount of fuel input to the boiler based on the required load amount of the boiler.
- Optimal value information 215: Adder, SV ... Set main steam pressure, PV ... Measured main steam pressure, PX ... Main steam pressure transmitter, MWD, MWD ', MWD "... Load requirement, BID, BID', BID” ... Boiler input command value, K ... Fuel Correction coefficient, KP: reference curve correction coefficient, FX: fuel function, FXAI: initial value and fine adjustment function, VFX: reference curve correction function
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Abstract
Description
上述したように、ボイラ設備を使用してエネルギーを取得する場合、ボイラの蒸気要求量(負荷要求量MWD)に対応する燃料(例えば石炭やバイオマス燃料等)投入量(ボイラ入力指令値BID)は、燃料関数FXを用いて決定される。このとき、負荷要求量MWDは、ボイラの主蒸気圧を所望の設定主蒸気圧に近づけるようなフィードバック補正を行うよう制御される。 (Embodiment 1)
As described above, when energy is acquired using boiler equipment, the input amount (boiler input command value BID) of fuel (for example, coal or biomass fuel) corresponding to the steam request amount (load request amount MWD) of the boiler is , Determined using the fuel function FX. At this time, the required load amount MWD is controlled to perform feedback correction so as to bring the main steam pressure of the boiler closer to a desired set main steam pressure.
図1は、本発明の実施の形態1に係るボイラ燃焼制御システムの構成例について概要を示した図である。ボイラ燃焼制御システム1は、上述したように、プラントにおけるボイラ2に対する燃料投入量が最適となるように初期値および微調整関数FXAIを用いて基準曲線を調整することで燃料補正係数Kを決定し、制御情報としてボイラ2への燃料投入等を行う既設の回路等に出力する(すなわち、燃料関数FXを実質的に補正することでボイラ2の燃焼を制御する)装置である。 <System configuration>
1 is a diagram showing an outline of a configuration example of a boiler combustion control system according to Embodiment 1 of the present invention. As described above, the boiler combustion control system 1 determines the fuel correction coefficient K by adjusting the reference curve using the initial value and the fine adjustment function FXAI so that the amount of fuel input to the boiler 2 in the plant is optimized. The control information is output to an existing circuit or the like that inputs fuel into the boiler 2 (that is, the combustion of the boiler 2 is controlled by substantially correcting the fuel function FX).
図3は、本実施の形態における初期値および微調整関数FXAIの補正を行う処理の流れの例を示したフロー図である。ここでは、基準曲線補正部12の基準曲線補正判定部124において基準曲線補正関数VFXを設定する部分までの処理の流れを示す。以降は、基準曲線補正部12の基準曲線補正係数出力部125が、設定された基準曲線補正関数VFXに基づいて負荷要求量MWDに対応する基準曲線補正係数KPを取得して出力する。 <Initial Value and Fine Adjustment Function FXAI Correction Process>
FIG. 3 is a flowchart showing an example of a flow of processing for correcting the initial value and the fine adjustment function FXAI in the present embodiment. Here, the flow of processing up to the part where the reference curve correction function VFX is set in the reference curve
次に、実施の形態2について説明する。なお、以下では、前述の実施の形態と重複する箇所については、原則としてその説明を省略する。 (Embodiment 2)
Next, a second embodiment will be described. In the following description, in principle, the description of the same parts as those of the above-described embodiment will be omitted.
11…除算部、12…基準曲線補正部、13…乗算部、14…燃料補正係数演算部、
121…偏差判定部、122…周期判定部、123…振幅判定部、124…基準曲線補正判定部、125…基準曲線補正係数出力部、126…周期履歴、127…振幅履歴、128…最適値情報、
215…加算部、
SV…設定主蒸気圧、PV…測定主蒸気圧、PX…主蒸気圧発信器、MWD、MWD’、MWD”…負荷要求量、BID、BID’、BID”…ボイラ入力指令値、K…燃料補正係数、KP…基準曲線補正係数、FX…燃料関数、FXAI…初期値および微調整関数、VFX…基準曲線補正関数 DESCRIPTION OF SYMBOLS 1,201 ... Boiler combustion control system, 2 ... Boiler, 3 ... Steam turbine, 4 ... PID control part, 5 ... Addition part, 6 ... Multiplication part, 7 ... Fuel injection amount calculating part,
DESCRIPTION OF SYMBOLS 11 ... Division part, 12 ... Base curve correction | amendment part, 13 ... Multiplication part, 14 ... Fuel correction coefficient calculating part,
DESCRIPTION OF
215: Adder,
SV ... Set main steam pressure, PV ... Measured main steam pressure, PX ... Main steam pressure transmitter, MWD, MWD ', MWD "... Load requirement, BID, BID', BID" ... Boiler input command value, K ... Fuel Correction coefficient, KP: reference curve correction coefficient, FX: fuel function, FXAI: initial value and fine adjustment function, VFX: reference curve correction function
Claims (7)
- 負荷要求量に対して所定の燃料関数に基づいて算出されたボイラへの燃料投入量に係る燃料を前記ボイラに供給し、測定された前記ボイラの主蒸気圧である測定主蒸気圧と、予め設定された前記ボイラの主蒸気圧である設定主蒸気圧とに基づいてフィードバック補正量を求め、前記フィードバック補正量に基づいて前記負荷要求量もしくは前記燃料投入量を補正するプラントに対して、前記フィードバック補正後の前記負荷要求量もしくは前記燃料投入量を補正する燃料補正係数を出力するボイラ燃焼制御システムであって、
前記フィードバック補正の前後の前記負荷要求量の比と、前記ボイラについて前記負荷要求量と前記燃料投入量との関係の初期値を規定した初期値および微調整関数と、に基づいて前記燃料補正係数を算出する燃料補正係数演算部と、
前記初期値および微調整関数を補正する基準曲線補正係数を出力する基準曲線補正部と、を有し、
前記基準曲線補正部は、
前記測定主蒸気圧と前記設定主蒸気圧との偏差を算出する偏差判定部と、
前記偏差の変動に係る周期を取得して記録する周期判定部と、
前記偏差の変動に係る振幅を取得して記録する振幅判定部と、
前記基準曲線補正係数を所定の基準曲線補正関数に基づいて算出して出力する基準曲線補正係数出力部と、
前記周期と前記振幅の組み合わせが所定の条件を満たすか否かを判定し、前記条件を満たした場合に、前記ボイラに対する制御状態に基づいて、前記基準曲線補正関数を補正する基準曲線補正判定部と、を有する、ボイラ燃焼制御システム。 A fuel related to the amount of fuel input to the boiler calculated based on a predetermined fuel function with respect to the load demand is supplied to the boiler, and a measured main steam pressure that is a measured main steam pressure of the boiler, Obtaining a feedback correction amount based on the set main steam pressure that is the main steam pressure of the boiler, for the plant that corrects the required load amount or the fuel input amount based on the feedback correction amount, A boiler combustion control system that outputs a fuel correction coefficient for correcting the load requirement amount or the fuel input amount after feedback correction,
The fuel correction coefficient based on a ratio of the load request amount before and after the feedback correction, and an initial value and a fine adjustment function that define an initial value of a relationship between the load request amount and the fuel input amount for the boiler A fuel correction coefficient calculation unit for calculating
A reference curve correction unit that outputs a reference curve correction coefficient for correcting the initial value and the fine adjustment function,
The reference curve correction unit is
A deviation determination unit for calculating a deviation between the measured main vapor pressure and the set main vapor pressure;
A period determination unit that acquires and records a period related to the variation of the deviation;
An amplitude determination unit that acquires and records the amplitude according to the variation of the deviation;
A reference curve correction coefficient output unit that calculates and outputs the reference curve correction coefficient based on a predetermined reference curve correction function;
A reference curve correction determination unit that determines whether a combination of the period and the amplitude satisfies a predetermined condition and corrects the reference curve correction function based on a control state for the boiler when the condition is satisfied. And having a boiler combustion control system. - 請求項1に記載のボイラ燃焼制御システムにおいて、
前記条件は、前記振幅が所定の範囲内にあり、かつ前記周期が過去の一定時間範囲の履歴において最も小さいことである、ボイラ燃焼制御システム。 In the boiler combustion control system according to claim 1,
The boiler combustion control system, wherein the condition is that the amplitude is within a predetermined range, and the period is the smallest in a history of a predetermined time range in the past. - 請求項1に記載のボイラ燃焼制御システムにおいて、
前記周期判定部および前記振幅判定部は、それぞれ、前記周期および前記振幅を、過去の一定時間における移動平均によって取得する、ボイラ燃焼制御システム。 In the boiler combustion control system according to claim 1,
The boiler combustion control system, wherein the cycle determination unit and the amplitude determination unit acquire the cycle and the amplitude by a moving average in a past fixed time, respectively. - 請求項1に記載のボイラ燃焼制御システムにおいて、
前記基準曲線補正関数は可変関数として設定され、
前記基準曲線補正判定部は、前記基準曲線補正関数を、前記周期と前記振幅の組み合わせが前記条件を満たす間、移動させることで補正する、ボイラ燃焼制御システム。 In the boiler combustion control system according to claim 1,
The reference curve correction function is set as a variable function,
The boiler curve control system, wherein the reference curve correction determination unit corrects the reference curve correction function by moving the reference curve correction function while the combination of the period and the amplitude satisfies the condition. - 請求項1に記載のボイラ燃料制御システムにおいて、
前記燃料補正係数演算部は、前記フィードバック補正前の前記負荷要求量と、前記ボイラに供給される水と燃料との重量比で規定される水燃比に基づき調整された前記フィードバック補正後の前記負荷要求量との比に基づいて前記燃料補正係数を算出する、ボイラ燃料制御システム。 The boiler fuel control system according to claim 1,
The fuel correction coefficient calculation unit is configured to adjust the load after the feedback correction adjusted based on the load requirement before the feedback correction and a water / fuel ratio defined by a weight ratio of water and fuel supplied to the boiler. A boiler fuel control system that calculates the fuel correction coefficient based on a ratio to a required amount. - 負荷要求量に対して所定の燃料関数に基づいて算出されたボイラへの燃料投入量に係る燃料を前記ボイラに供給し、測定された前記ボイラの主蒸気圧である測定主蒸気圧と、予め設定された前記ボイラの主蒸気圧である設定主蒸気圧とに基づいてフィードバック補正量を求め、前記フィードバック補正量に基づいて前記負荷要求量もしくは前記燃料投入量を補正するプラントに対して、前記フィードバック補正後の前記負荷要求量もしくは前記燃料投入量を補正する燃料補正係数を出力するボイラ燃焼制御システムにおけるボイラ燃焼制御方法であって、
前記フィードバック補正の前後の前記負荷要求量の比と、前記ボイラについて前記負荷要求量と前記燃料投入量との関係の初期値を規定した初期値および微調整関数と、に基づいて前記燃料補正係数を算出する燃料補正係数演算工程と、
前記初期値および微調整関数を補正する基準曲線補正係数を出力する基準曲線補正工程と、を有し、
前記基準曲線補正工程は、
前記測定主蒸気圧と前記設定主蒸気圧との偏差を算出する偏差判定工程と、
前記偏差の変動に係る周期を取得して記録する周期判定工程と、
前記偏差の変動に係る振幅を取得して記録する振幅判定工程と、
前記基準曲線補正係数を所定の基準曲線補正関数に基づいて算出して出力する基準曲線補正係数出力工程と、
前記周期と前記振幅の組み合わせが所定の条件を満たすか否かを判定し、前記条件を満たした場合に、前記ボイラに対する制御状態に基づいて、前記基準曲線補正関数を補正する基準曲線補正判定工程と、を有する、ボイラ燃焼制御方法。 A fuel related to the amount of fuel input to the boiler calculated based on a predetermined fuel function with respect to the load demand is supplied to the boiler, and a measured main steam pressure that is a measured main steam pressure of the boiler, Obtaining a feedback correction amount based on the set main steam pressure that is the main steam pressure of the boiler, for the plant that corrects the required load amount or the fuel input amount based on the feedback correction amount, A boiler combustion control method in a boiler combustion control system that outputs a fuel correction coefficient for correcting the load requirement amount or the fuel input amount after feedback correction,
The fuel correction coefficient based on a ratio of the load request amount before and after the feedback correction, and an initial value and a fine adjustment function that define an initial value of a relationship between the load request amount and the fuel input amount for the boiler A fuel correction coefficient calculation step for calculating
A reference curve correction step for outputting a reference curve correction coefficient for correcting the initial value and the fine adjustment function,
The reference curve correction step includes
A deviation determining step of calculating a deviation between the measured main vapor pressure and the set main vapor pressure;
A period determination step of acquiring and recording a period related to the variation of the deviation;
An amplitude determination step of acquiring and recording an amplitude related to the variation of the deviation;
A reference curve correction coefficient output step of calculating and outputting the reference curve correction coefficient based on a predetermined reference curve correction function;
A reference curve correction determination step of determining whether a combination of the period and the amplitude satisfies a predetermined condition and correcting the reference curve correction function based on a control state for the boiler when the condition is satisfied. And a boiler combustion control method. - 請求項6に記載のボイラ燃焼制御システムにおいて、
前記燃料補正係数演算工程の前に、前記ボイラに供給される水と燃料との重量比で規定される水燃比に基づき、前記フィードバック補正後の前記負荷要求量を調整し、前記フィードバック補正前の前記負荷要求量と、調整した後の前記フィードバック補正後の前記負荷要求量との比を算出する工程を有し、
前記燃料補正係数演算工程では、調整した後の前記フィードバック補正後の前記負荷要求量に基づいて算出された前記比に基づいて前記燃料補正係数を算出する、ボイラ燃焼制御方法。 In the boiler combustion control system according to claim 6,
Prior to the fuel correction coefficient calculation step, the load request amount after the feedback correction is adjusted based on a water / fuel ratio defined by a weight ratio between water and fuel supplied to the boiler, and before the feedback correction. Calculating a ratio between the load requirement amount and the load requirement amount after the feedback correction after adjustment;
The boiler combustion control method, wherein, in the fuel correction coefficient calculation step, the fuel correction coefficient is calculated based on the ratio calculated based on the load request amount after the feedback correction after the adjustment.
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