WO2021140900A1 - Boiler operation simulator, boiler operation assistance device, boiler operation control device, boiler operation simulation method, boiler operation simulation program, and recording medium with boiler operation simulation program recorded on same - Google Patents

Abstract

This boiler operation simulator, including: a first branch system which becomes a path for a fluid flowing inside a heat transfer part of a boiler; and a second branch system which is spatially separated from the first branch system in the heat transfer part, is provided with a boiler heat transfer calculation unit which applies, to a boiler heat transfer model for calculating a formal process value generated in the heat transfer part when the boiler is virtually operated, a calculation condition including a formal input parameter assumed to be set in the boiler in the virtual operation, calculates each of a first formal process value generated in the heat transfer unit on the first branch system and a second formal process value generated in the heat transfer unit on the second branch system, and outputs each of the first formal process value and the second formal process value.

Description

Boiler driving simulator, boiler driving support device, boiler driving control device, boiler driving simulation method, boiler driving simulation program, and recording medium recording boiler driving simulation program

The present invention relates to a boiler driving simulator.

As an operation simulator of a boiler installed in a thermal power plant, Patent Document 1 states that "the inner loop is a high-speed version dynamic characteristic simulator that can predict the characteristics of a plant when it is operated according to the assumed plan in a short time. , This predicted value is compared and evaluated with the limit value of the operation restriction condition, and the above plan is modified by fuzzy inference or the like in the direction of obtaining better operation characteristics. The outer loop is obtained by the inner loop. It consists of a high-precision dynamic characteristic simulator for inputting the optimum plan, a means for instructing the operation limiting condition of the inner loop and the modification of the dynamic characteristic model in the direction of reducing the difference in the characteristics obtained by the inner and outer loops, and the like. In the start-up test accompanied by, an actual plant may be used instead of the outer dynamic characteristic simulator (summary excerpt). "

Japanese Patent No. 3333674

Because there is a spatial spread inside the boiler furnace, when the boiler is actually burned, the heat transfer surface temperature may differ depending on the position of the heat transfer surface in the left-right direction. In order to further pursue economic efficiency and stability of boiler operation, it is necessary to improve the accuracy of the operation simulator, but for that purpose, it is desirable to consider the spatial deviation of the heat transfer part of the boiler. However, Patent Document 1 does not consider the spatial deviation, and as a result of the simulator, only the average value of the operating conditions is obtained, and there is room for further ingenuity.

The present invention solves the above-mentioned problems, and aims to improve the accuracy of boiler operation simulation.

In order to achieve the above purpose, the structure described in the claims is provided. To give an example, in a boiler operation simulator, the boiler has a first branch system that serves as a path for fluid flowing through the heat transfer section of the boiler, and the first branch system in the heat transfer section. The operation simulator includes a second branch system arranged at spatial intervals, and the operation simulator is a boiler heat transfer model for calculating a temporary process value generated in the heat transfer unit when the boiler is virtually operated. The first tentative process value generated in the heat transfer unit on the first branch system and the first tentative process value generated in the heat transfer unit on the first branch system are applied to the calculation conditions including the tentative input parameters assumed to be set in the boiler in the virtual operation. It is provided with a boiler heat transfer calculation unit that calculates the second tentative process value generated in the heat transfer unit on the two-branch system and outputs the first tentative process value and the second tentative process value, respectively. , Characterized by.

According to the present invention, it is possible to provide a boiler operation simulator capable of improving the accuracy of boiler operation simulation. Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

Fluid system diagram of the power plant of this embodiment Hardware configuration diagram of a driving support device equipped with a boiler driving simulator Functional block diagram of the driving support device Flowchart showing the process flow of the process simulator Flow chart showing the overall processing flow of the boiler operation support device Diagram showing an example of data that defines input / output relationships for machine learning Diagram showing an example of index DB The figure which shows the conventional heat calculation processing example (from economizer to superheater) Diagram showing an example of boiler heat transfer calculation considering the boiler system The figure which shows the boiler heat transfer calculation example which considered the cycle and the calorific value fluctuation with time change in addition to the boiler system. Graph showing driving simulator output

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes a combination of the respective embodiments.

The power generation plant 100 has a boiler 110 that burns fuel and generates steam by the heat of the combustion, and a steam turbine that drives a generator 101 by rotating a turbine using the steam generated by the boiler 110 to generate power. Specifically, a high-pressure steam turbine (HPT) 121, a medium-pressure steam turbine (IPT) 122, a low-pressure steam turbine (LPT) 123, a water supply line 130 for supplying water to the boiler 110, and an operation control device 150 (FIG. 2) and.

The boiler 110 includes an economizer (ECO) 111, a furnace water cooling wall (WW) 112, a brackish water separator (WS) 113, a superheater (SH) 114, and a reheater (RH) 115. ..

In the present embodiment, the superheater 114 includes a superheater 114 having a plurality of stages, specifically, 1SH, 2SH, and 3SH in three stages from the downstream to the upstream in the flow path direction (see FIGS. 7, 8 and 9). The reheater 115 is provided with two stages from the downstream to the upstream.

On the water supply line 130, there are a condenser 131, a condenser pump 132, a low pressure water supply superheater (low pressure heater) 133, a deaerator 134, a water supply pump 135, and a high pressure water supply superheater (high pressure heater) 136. And are provided.

In the power plant 100 having the above configuration, the economizer 111 preheats the supplied water by heat exchange with the combustion gas. The water preheated by the economizer 111 produces a water-steam two-phase fluid in the furnace water cooling wall 112 by passing through a furnace wall pipe (not shown) formed on the wall. The water-steam two-phase fluid generated in the furnace water cooling wall 112 is sent to the brackish water separator 113 and separated into saturated steam and saturated water. Here, the saturated steam is guided to the superheater 114, and the saturated water is guided to the condenser 131 through the first pipe 161.

The saturated steam separated by the brackish water separator 113 is superheated by the superheater 114 by heat exchange with the combustion gas, and is supplied to the high-pressure steam turbine 121 via the main steam pipe 162. The main steam pipe 162 is provided with a first shut-off valve 176 that is always open. The outlet of the high pressure steam turbine 121 is connected to the low temperature reheat steam pipe 163.

The low temperature reheat steam pipe 163 is branched and connected to the ventilator line 199 at the first connection point 191 in front of the reheater 115. The ventilator line 199 is connected to the condenser 131. In the low temperature reheat steam pipe 163, an exhaust forced check valve 192 for suppressing the backflow of steam to the high pressure steam turbine 121 is provided between the first connection point 191 and the reheater 115.

In the ventilator line 199, a ventilator valve 193 is provided between the first connection point 191 and the condenser 131. The ventilator valve 193 is always closed, and is fully opened during FCB (fast cutback) operation, and fully closed during normal operation and in-house single load operation.

The steam that has performed the predetermined work in the high-pressure steam turbine 121 is guided to the reheater 115 via the low-temperature reheat steam pipe 163 during normal operation. The normal operation here means an operation in a state of being connected to the power transmission system.

The reheater 115 reheats the steam that has performed the predetermined work in the high-pressure steam turbine 121. The steam superheated by the reheater 115 is supplied to the medium-pressure steam turbine 122 and the low-pressure steam turbine 123 via the high-temperature reheat steam pipe 164, where they perform work and drive the generator 101. The high temperature reheat steam pipe 164 is provided with a second shutoff valve 177 that is always open.

The second connection point 194 between the superheater 114 and the first shutoff valve 176 in the main steam pipe 162 and the third connection point 195 on the downstream side of the exhaust forced check valve 192 in the low temperature reheat steam pipe 163. Is connected by a high pressure bypass steam pipe 165. The high-pressure bypass steam pipe 165 is provided with a normally closed high-pressure bypass on-off valve 171.

Further, in the high temperature reheat steam pipe 164, the fourth connection point 196 between the reheater 115 and the second stop valve 177 and the condenser 131 are connected by a low pressure bypass steam pipe 167. The low-pressure bypass steam pipe 167 is provided with a low-pressure bypass on-off valve 172 that is always closed.

The steam that has finished its work in the low-pressure steam turbine 123 is supplied to the condenser 131 by the first exhaust steam pipe 166. The condensate condensed water in the condensate 131 is sent to the deaerator 134 after passing through the low pressure heater 133 by the condensate pump 132 together with the saturated water sent from the brackish water separator 113, and the gas component in the condensate is removed. Will be done. The condensate that has passed through the deaerator 134 is further boosted by the water supply pump 135, then fed to the high-pressure water supply superheater 136 to be heated, and finally returned to the boiler 110.

In addition, the power plant 100 is equipped with three sprays for controlling the temperature of superheated steam. Specifically, the water supply from the pre-stage superheater spray 211 flows into the flow path between the outlet of 1SH, which is the first-stage superheater 114, and the inlet of 2SH, which is the second-stage superheater 114. The first water supply port 201 is provided. The front-stage superheater water supply line 215, which serves as a flow path for water supply from the front-stage superheater spray 211 to the first water supply port 201, is provided with a front-stage superheater spray valve 202.

Between the outlet of the 2SH and the inlet of the 3SH, which is the third-stage superheater 114, a second water supply port 203 into which the spray from the rear-stage superheater spray 212 flows is provided. The rear-stage superheater water supply line 216, which serves as a flow path for water supply from the rear-stage superheater spray 212 to the second water supply port 203, is provided with a rear-stage superheater spray valve 204.

Similarly, the third water supply port 205 into which the spray from the reheater spray 213 flows into the flow path between the outlet of the first-stage reheater 115 and the inlet of the second-stage reheater 115. Is provided. A reheater spray valve 206 is provided in the reheater water supply line 217, which is a flow path for water supply from the reheater spray 213 to the third water supply port 205.

In FIG. 1, for convenience of explanation, the signal line connecting the operation control device 150 (see FIG. 2) and each control valve is shown in a simplified manner, but each control valve and the operation control device 150 have a signal line. It is electrically or communicated via. Then, the opening degree control signal of the operation control device 150 is transmitted to each control valve, and the opening / closing control of each control valve is executed.

FIG. 2 is a hardware configuration diagram of a driving support device 300 equipped with a driving simulator of the boiler 110. The operation support device 300 includes a CPU (Central Processing Unit) 301, a RAM (Random Access Memory) 302, a ROM (Read Only Memory) 303, an HDD (Hard Disk Drive) 304, an input I / F 305, and an output I / F 306. , These are configured using computers connected to each other via bus 307. A monitor 308 may be connected to the output I / F 306 so that the simulation result of the driving simulator can be displayed.

On the other hand, the operation control device 150 of the boiler 110 includes a CPU 151, a RAM 152, a ROM 153, an HDD 154, an input I / F 155, and an output I / F 156, and these are configured by using a computer connected to each other via a bus 157. ..

The output I / F 156 of the operation control device 150 is connected to the input I / F 305 of the operation support device 300. Then, the actual input parameters used in the actual operation of the boiler 110 and the actual process values obtained as a result of the actual operation by setting the actual input parameters in the boiler 110 are transferred from the operation control device 150 to the operation support device 300. Will be sent. The transmitted actual input parameter and the actual process value form one calculation condition associated with each other. Although FIG. 2 shows an example in which the operation support device 300 and the operation control device 150 are configured by separate hardware, the operation support device 300 and the operation control device 150 are configured by the same hardware. A program that realizes the functions of each device may be executed by one hardware. Further, the operation control device 150 outputs a control signal for setting the actual input parameter acquired from the operation support device 300 of the boiler 110 to the operation end of the boiler 110 to the operation end. As a result, the actual operation can be performed under the operating conditions evaluated by the driving support device 300 (corresponding to the following "calculation conditions").

FIG. 3 is a functional block diagram of the driving support device 300. The operation support device 300 selects a suitable calculation condition from the operation simulator 350 of the boiler 110, the index creation unit 330, and the calculation conditions simulated by the operation simulator 350, and outputs the operation support unit 360 to the operation control device 150. And, including. The driving simulator 350 is not a function of the driving support device 300, but can be configured as a device that realizes the simulation function by the driving simulator 350 alone.

The operation simulator 350 includes a control simulator 310 and a process simulator 320.

The control simulator 310 includes an operation end model 311 and a control device model 312, and a detection end model 313.

The process simulator 320 simulates the process values (for example, steam flow rate, steam temperature, steam pressure) related to the steam of the boiler 110 based on the design data, the physical formula, and the engineering formula.

The process simulator 320 uses the boiler heat transfer model creation unit 321, the boiler heat transfer model storage unit 322 that stores the boiler heat transfer model created by the boiler heat transfer model creation unit 321, and the boiler heat transfer model to calculate heat transfer. It includes a boiler heat transfer calculation unit 323 for performing the above, and an index database (DB) storage unit 324 for storing an index (which may include an index related to spatial deviation and fluctuation over time) described later. The "boiler heat transfer model" referred to here is a model that reproduces the tentative process value generated in the heat transfer portion of the boiler 110 when the boiler 110 is virtually operated.

The boiler heat transfer calculation unit 323 acquires a temporary input parameter from the operation end model 311 (operation amount input process), and uses this to execute the flow rate / pressure distribution calculation process, the mass balance calculation process, and the heat balance calculation process in this order. Then, the temporary process value obtained as a result of each calculation process is output to the detection end model 313 and the index DB storage unit 324 (process value output process).

The index related to the fluctuation over time stored in the index DB storage unit 324 is created by the index creation unit 330. The index creation unit 330 performs processing by a CFD (Computational Fluid Dynamics) simulator, machine learning using the CFD calculation result obtained as a result, and index extraction processing for extracting an index from the result of machine learning. Execute.

The control device model 312 is a model of the operation control device 150 of the boiler 110. When the control device model 312 receives the input of the temporary process value from the detection end model 313, the control device model 312 calculates the temporary input parameter for optimally operating the boiler 110 based on the temporary process value, and temporarily inputs the temporary process value to the operation end model 311. Set the parameters.

The driving support unit 360 acquires the calculation conditions simulated by the driving simulator 350 and selects suitable calculation conditions based on the evaluation results of the calculation condition evaluation unit 361 and the calculation condition evaluation unit 361 that evaluate the quality of each calculation condition. Then, the operation control device 150 includes an actual input parameter output unit 362 that outputs the input parameters included in the calculation conditions to the operation control device 150 as actual input parameters. The operation control device 150 sets this actual input parameter at each operating end of the boiler 110. As a result, the boiler 110 can be actually operated using the calculation conditions simulated by the operation simulator 350.

As a processing example of the calculation condition evaluation unit 361, for example, an individual score corresponding to the process value is assigned to each process value in advance, and the individual scores of the process values obtained under one calculation condition are totaled to obtain a total score. Is calculated. Then, the actual input parameter output unit 362 may select and output the calculation conditions to be output to the operation control device 150 based on the magnitude of the total score.

4 and 5 are flowcharts showing the processing procedure of the boiler operation support device. FIG. 4 is a flowchart showing a processing flow of the index creating unit 330 performed as a preliminary preparation. FIG. 5 is a flowchart mainly showing a processing flow of the operation simulator 350.

The flowchart of FIG. 4 will be described. The index creation unit 330 (CFD simulator) sets the calculation conditions for the CFD simulation that reproduces the combustion characteristics of the boiler (S101), and performs the CFD calculation (S102). For the CFD used here, a method capable of reproducing the spatial deviation of combustion and the fluctuation over time is preferable, and for example, LES (Large Eddy Simulation, unsteady simulation) is a candidate. Further, the "calculation condition" referred to here is an operating condition when performing CFD simulation calculation, and is specifically defined including a set of input parameters set at the operation end. Examples of input parameters include, for example, the opening degree of a damper and the opening degree control signal of various spray valves. Further, individual input parameters included in one calculation condition and mathematical formulas used for CFD calculation may also be included in the calculation condition.

The overall flow of FIG. 4 will be described by taking FIGS. 6A and 6B as examples. FIG. 6A is an example of data in which the input / output relationship for machine learning is defined. FIG. 6B is a diagram showing an example of an index DB. The horizontal axes T1, T2, ..., T18 (corresponding to the "initial calculation condition") of the orthogonal array indicate that there are 18 calculation conditions T. This calculation condition includes eight temporary input parameters, x1, x2, ..., X8. In S102, one calculation condition, for example, temporary input parameters x1, x2, ..., X8 of T1 are read out from the orthogonal array. Then, the index creation unit 330 (CFD simulator) applies the temporary input parameters x1, x2, ..., X8 to the CFD reproduction model, and the boiler heat transfer calculation unit 323 outputs as a value used for the boiler heat transfer calculation. Is calculated. The output may include those relating to spatial deviation and those relating to temporal deviation. As the output related to the spatial deviation, the heat input QA of the first branch system, the heat input QB of the second branch system, the spatial correction coefficient α, the correction amount Q for the boiler heat transfer calculation result of the conventional example, and the output related to the change with time. The amplitude λ of the calorific value fluctuation and the period T may be included as the heat transfer. Each of the above types of outputs is an example, and not all of these outputs are necessary, and at least one or more outputs are appropriately calculated.

The index creation unit 330 (CFD simulator) sets the input / output relationship for machine learning by associating the temporary input parameter with the output obtained in S103 (S103).

The index creation unit 330 (CFD simulator) performs CFD simulation for all of the calculation conditions T1 to T18.

The index creation unit 330 (machine learning) machine-learns the input / output relationship (main process list) using the calculation result of CFD simulation for all the calculation conditions T1 to T18, and can reproduce the input / output relationship. Create a model. For machine learning here, known algorithms such as random forest, gradient boosting tree, neural network, Ridge regression, Lasso regression, nearest neighbor method and the like may be appropriately used.

The index creation unit 330 (index extraction) sets calculation conditions having input parameters different from those of calculation conditions T1 to T18. This calculation condition is an additional calculation condition (S105). In general, a calculation using a machine learning model can be performed in a shorter time and at a lower cost than a CFD calculation. In the index DB of FIG. 6B, 6651 additional calculation conditions are set, which is more than the CFD calculation conditions (18 ways) (based on the temporary input parameters and outputs of the 18 calculation conditions, 3 to the 8th power). That is, the temporary input parameter of the calculation condition of 6561 is set). The index DB of FIG. 6B may include a calculation condition that considers at least one of a spatial deviation, a period associated with a change over time, and a calorific value fluctuation amount.

The index creation unit 330 (index extraction) inputs the parameters of the calculation conditions into the machine learning model, performs additional calculations, and obtains an output (S106). This result is performed in all 6651 ways, the results are organized, and the index related to the spatial deviation of combustion and the fluctuation with time is extracted to create an index DB (see FIG. 6B) (S107).

Next, the flowchart of FIG. 5 will be described. First, the boiler heat transfer model creation unit 321 sets the boiler heat transfer calculation conditions, and the control simulator 310 further sets the calculation conditions required for driving support of the boiler 110 (S201). Specifically, the calculation condition referred to here means a set of temporary input parameters that define the calculation condition when performing an operation simulation. The operation end model 311 outputs a temporary input parameter virtually set to each operation end of the boiler 110 to the boiler heat transfer calculation unit 323.

The boiler heat transfer calculation unit 323 reads the spatial deviation and fluctuation index from the index DB storage unit 324 (S202). The boiler heat transfer calculation unit 323 applies the spatial deviation, the period accompanying the change over time, and the fluctuation index to the boiler heat transfer model, and performs an improved calculation (S203). The term "improved calculation" is used to distinguish it from the basic calculation on the premise that there is only one system shown in FIG. 7, which will be described later.

The boiler heat transfer calculation unit 323 outputs the result of the improved calculation to the detection end model 313 (S204).

Next, the flow of boiler heat transfer model calculation will be explained.

The boiler heat transfer model creation unit 321 accepts inputs of main engine design data, auxiliary equipment design data, and grid connection data, and applies these input data to physical and engineering formulas to create a boiler heat transfer model.

As the main engine design data, for example, there are design data of the generator 101, the turbine (HPT121, IPT122, LPT123), and the boiler 110. Auxiliary equipment design data includes a condenser 131, a deaerator 134, a condenser pump 132, a water supply pump 135, a fan, and various control valves. Further, as system connection data, for example, there is a flow path system of turbine steam, wind flue, and boiler superheated steam.

Examples of physical and engineering formulas used by the boiler heat transfer model creation unit 321 for model creation are physics-based formulas (1), fluid dynamics-based formulas (2), thermodynamics-based formulas (3), and heat transfer. Equation (4) based on thermodynamics may be used.

The boiler heat transfer model creation unit 321 stores the created boiler heat transfer model in the boiler heat transfer model storage unit 322.

FIG. 7 shows an example of a conventional boiler heat transfer calculation process, in which it is considered that there is one steam line between the economizers 111 and 3SH, and the heat transfer section on the steam line of one system is moved from downstream to upstream. An example is shown in which the heat is calculated by blocking toward. Specifically, the economizer (ECO) 111, the furnace water cooling wall (WW) 112, the brackish water separator (WS) 113, and the superheater (SH) 114 are divided into 1SH, 2SH, and 3SH for each stage. Then, the boiler heat transfer calculation unit 323 multiplies the difference between the inlet enthalpy (Hin: this is the same value as the outlet enthalpy of the immediately preceding block) and the outlet enthalpy (Hout) of each block by the spray flow rate G of each block. The heat input Q ** of each block is calculated by the following equation (5).
Q ** = (H ** out-H ** in) xG ** flow ... (5)

For example, the heat input Qww of the furnace water cooling wall 112 is obtained by the following equation (6).
Qww = (Hwww-Heco) xGww ... (6)

FIG. 8 shows an example of boiler heat transfer calculation processing considering the system of the boiler 110.

The steam line of the boiler 110 is not one system, but actually branches into multiple systems. A plurality of branch systems are arranged in the horizontal plane at intervals in the left-right direction. As a result, the heat input to the heat transfer section and the outlet enthalpies such as the fluid temperature and the fluid pressure at the outlet of the heat transfer section differ at the left and right ends.

Specifically, as shown in FIG. 8, in the actual boiler 110, the steam line is one system up to the economizer 111, the furnace water cooling wall 112, and the brackish water separator 113, but the outlet of the brackish water separator 113. It is separated into a first branch system (left branch system) and a second branch system (right branch system) from the to the entrance of 1SH. A first branch system (left branch system) and a second branch system (right branch system) are provided from the outlets of 1SH to 3SH.

Next, the boiler heat transfer calculation unit 323 describes the heat input Q1sA, Q2sA, and Q3sA for each block of 1SH, 2SH, and 3SH for the first branch system and the second branch system (Q * sA corresponds to the first provisional process value). , Q1sB, Q2sB, Q3sB (Q * sB corresponds to the second tentative process value). Specifically, the exit enthalpies H1soA, H2soA, H3soA of each block of the first system, and the exit enthalpies H1soB, H2soB, H3soB of each block of the second branch system are applied to the equation (5), and the first branch system, the first branch system, the first The heat input Q1sA, Q2sA, Q3sA, Q1sB, Q2sB, and Q3sB for each block on the two-branch system are calculated.

Here, as a method of considering the spatial deviation of the heat input Q, the following can be typically given. However, the present invention is not limited to this, and other methods may be used.
1) When the value of heat input of each branch system is directly described in the index DB QA and QB are directly read from the index DB to express the spatial deviation.
Here, QA: heat input of the first branch system, QB: heat input of the second branch system 2) When the spatial correction coefficient is described in the index DB According to the following equation (7), the boiler transfer of the conventional example A thermal calculation (see FIG. 7) is performed, and the correction coefficient α of the representative system is read from the index DB and multiplied by half of the obtained heat input to obtain the lateral deviation.
QA = α × Q / 2, QB = (1-α) × Q / 2 ... (7)
3) When the spatial correction amount is described in the index DB According to the following formula (8), the boiler heat transfer calculation of the conventional example (see FIG. 7) is performed, and the index is used for half of the obtained heat input. The correction amount Q'is read from the DB and adjusted to obtain the lateral deviation.
QA = Q / 2 + Q', QB = Q / 2-Q'... (8)

The above is an example of performing boiler heat transfer calculation processing in consideration of only the spatial deviation at a certain time point. However, in the actual operation of the boiler 110, the heat input and outlet enthalpy fluctuate periodically with the passage of time, and the heat input and outlet enthalpy fluctuate in a minute time.

FIG. 9 shows an example of boiler heat transfer calculation in which fluctuations (cycle and calorific value fluctuation) due to changes with time are taken into consideration in addition to the system of the boiler 110.

The boiler heat transfer calculation unit 323 adds a fluctuation amount Δ to each of the inlet enthalpy and the outlet enthalpy in the heat transfer calculation of each block. That is, the exit enthalpy is set to Hout + ΔHout, and the entrance enthalpy is set to Hin + ΔHin. Then, by applying these values to the equation (5), the heat input Q to which the fluctuation amount ΔQ is added is calculated as shown in the equation (9).

Here, when considering the period and heat quantity fluctuation due to the change with time in addition to the spatial deviation, the heat input Q (current output) is the amplitude λ calculated from the index DB, and the heat quantity fluctuation function QA + Q (λA, TA), QB + Q (λB, TB).

The cycle and fluctuation are likely to occur when the opening degree of the damper provided in the boiler 110 changes. Therefore, it is effective to include the opening degree of the damper as a temporary input parameter, and to be able to perform the boiler heat transfer calculation including the above period and fluctuation especially when the opening degree of the damper changes.

The operation and effect of the process simulator 320 will be described with reference to FIG. FIG. 10 is a graph showing the output of the driving simulator.

In the actual boiler 110, although the fluid path was branched, conventionally, it was regarded as one system of fluid path and the average value was output (shown by the broken line in FIG. 10). Therefore, the spatial deviation of the branch system provided in the boiler 110 was not taken into consideration. As a result, in fact, for example, in the first branch system (left), even if the enthalpy of the furnace water cooling wall 112 is an abnormal value, it is averaged with the right enthalpy in the simulator output and detected as a normal value. Yes, the simulation accuracy was low.

On the other hand, in the operation simulator according to the present embodiment, since the enthalpy is calculated for each of the first branch system and the second branch system, the spatial deviation appears in the simulation output (shown by the solid line in FIG. 10). This improves the simulation accuracy.

Furthermore, when the actual boiler 110 is operated, the enthalpy fluctuation cycle and the calorific value fluctuation (fluctuation) occur with the passage of time.

However, conventionally, since the period and fluctuation are not taken into consideration, as shown in FIG. 10, even if the simulator output has a large periodic fluctuation, the minute fluctuation does not appear in the simulator output and can be represented by a smooth curve. ..

On the other hand, in the process simulator 320 according to the present embodiment, in order to consider the period and fluctuation, the operation simulator output has a period along the time direction as shown in FIG. 10, and the enthalpy increases or decreases in a minute time. .. As a result, the appearance of abnormal values in a minute time can be reproduced by the simulator, and the simulation accuracy is improved.

Further, in the process simulator 320 according to the present embodiment, the index creation unit 330 generates 6561 additional calculation conditions from the calculation conditions of 8 using the all-pair method and the orthogonal array, and performs CFD calculation and machine learning to generate the index DB. Create in advance. Therefore, the boiler heat transfer calculation is performed by reading the index from the index DB for the calculation load related to the CFD calculation including the spatial deviation, the period, and the fluctuation. Therefore, it is not necessary to perform CFD calculation at the time of boiler heat transfer calculation, and the calculation speed of the process simulator 320 can be increased. As a result, a process simulation can be performed in parallel with the actual operation of the boiler 110, and a suitable operation simulation can also be performed in the operation support for monitoring the boiler 110.

The above embodiment does not limit the present invention, and the design can be changed without departing from the gist of the present invention.

For example, for the index creation unit 330 shown in FIG. 3, an index DB may be created from the CFD calculation result without performing machine learning. Further, the index creating unit 330 may be arranged in the process simulator 320.

Further, in FIG. 7, the boiler branched from the downstream of the brackish water separator 113 to the first branch system and the second branch system, but also in the boiler branching from the upstream of the brackish water separator 113 to the first branch system and the second branch system. The present invention is applicable. In that case as well, the boiler heat transfer calculation may be performed for each of the first branch system and the second branch system, and a temporary process value reflecting the spatial deviation and the temporal deviation may be output.

Further, in the above embodiment, the index creation unit 330 has been described as a functional block different from the operation simulator 350 (see FIG. 3), but the index creation unit 330 may be configured as one function of the operation simulator 350.

100: Power plant 101: Generator 110: Boiler 111: Coal saving device 112: Fire furnace water cooling wall 113: Steam water separator 114: Superheater 115: Condenser 121: High pressure steam turbine 122: Medium pressure steam turbine 123: Low pressure steam Turbine 130: Water supply line 131: Condenser 132: Condensate pump 133: Low pressure heater 134: Deaerator 135: Water supply pump 136: High pressure water supply superheater 150: Operation control device 151: CPU
152: RAM
153: ROM
154: HDD
155: Input I / F
156: Output I / F
157: Bus 161: First pipe 162: Main steam pipe 163: Low temperature reheated steam pipe 164: High temperature reheated steam pipe 165: High pressure bypass steam pipe 166: First exhaust steam pipe 167: Low pressure bypass steam pipe 171: High pressure bypass On-off valve 172: Low-pressure bypass on-off valve 176: First blocking valve 177: Second blocking valve 191: First connection point 192: Exhaust forced check valve 193: Ventilator valve 194: Second connection point 195: Third connection Point 196: Fourth connection point 199: Ventilator line 201: First water supply port 202: Front stage superheater spray valve 203: Second water supply port 204: Rear stage superheater spray valve 205: Third water supply port 206: Reheater spray valve 211: Front stage superheater spray 212: Rear stage superheater spray 213: Reheater spray 215: Front stage superheater water supply line 216: Rear stage superheater water supply line 217: Reheater water supply line 300: Operation support device 305: Input I / F
306: Output I / F
307: Bus 308: Monitor 310: Control simulator 311: Operation end model 312: Control device model 313: Detection end model 320: Process simulator 321: Boiler heat transfer model creation unit 322: Boiler heat transfer model storage unit 323: Boiler heat transfer Calculation unit 324: Index DB storage unit 330: Index creation unit 350: Operation simulator 360: Operation support unit 361: Calculation condition evaluation unit 362: Actual input parameter output unit

Claims (10)

1. It ’s a boiler driving simulator.
   The boiler includes a first branch system that serves as a path for a fluid flowing through the heat transfer section of the boiler, and a second branch system that is spatially spaced from the first branch system in the heat transfer section. , Equipped with
   The driving simulator
   The boiler heat transfer model for calculating the temporary process value generated in the heat transfer unit when the boiler is virtually operated is provided with calculation conditions including temporary input parameters that are assumed to be set in the boiler in the virtual operation. Apply and calculate the first tentative process value generated in the heat transfer section on the first branch system and the second tentative process value generated in the heat transfer section on the second branch system, respectively. , A boiler heat transfer calculation unit that outputs the first tentative process value and the second tentative process value, respectively.
   Boiler driving simulator featuring that.
2. The boiler driving simulator according to claim 1.
   The boiler heat transfer calculation unit divides the heat transfer unit into a plurality of blocks from the downstream to the upstream in the flow path direction of the fluid, and the first tentative process value generated in each block on the first branch system. And the second tentative process value generated in each block on the second branch system are calculated respectively.
   Boiler driving simulator featuring that.
3. The boiler operation simulator according to claim 1 or 2.
   The calculation condition is a condition in which the temporary input parameter and the output obtained by performing a computational fluid dynamics calculation using the temporary input parameter are associated with each other.
   Boiler driving simulator featuring that.
4. The boiler driving simulator according to claim 3.
   The calculation condition is a condition in which the temporary input parameter is associated with an output including at least one of the periodic change or calorific value fluctuation amount of the boiler.
   The boiler operation simulator applies the temporary input parameter and an output including at least one of the periodic change or calorific value fluctuation amount of the boiler to the boiler heat transfer model, and the periodic change or calorific value fluctuation amount of the boiler. The first tentative process value and the second tentative process value including at least one of the above are calculated and output respectively.
   Boiler driving simulator featuring that.
5. In the boiler operation simulator according to claim 3 or 4, a numerical fluid dynamics calculation using the temporary input parameter is performed to calculate an output, and at least one in which the temporary input parameter and the output are associated with each other. Based on one or more initial calculation conditions, the relationship between the temporary input parameter and the output is machine-learned to calculate additional calculation conditions larger than the initial calculation conditions, and the initial calculation conditions and the additional calculation conditions are calculated. It also has an index creation unit that records in the index database.
   The boiler heat transfer calculation unit reads out the calculation conditions used for the boiler heat transfer calculation from the index database, applies the calculation conditions read out to the boiler heat transfer model, and applies the first tentative process value and the second tentative process value. To calculate,
   Boiler driving simulator featuring that.
6. The boiler operation simulator according to any one of claims 1, 2, 3, 4, or 5.
   The quality of the first tentative process value and the second tentative process value calculated by the operation simulator is evaluated, and the calculation conditions simulated by the operation simulator are selected based on the evaluation results and included in the selected calculation conditions. The temporary input parameter is output to the operation control device of the boiler as an actual input parameter.
   A boiler driving support device that is characterized by this.
7. The boiler operation support device according to claim 6, and the boiler operation control device that is communication-connected to each of the operation ends provided in the boiler.
   The operation control device outputs a control signal for setting the actual input parameter acquired from the operation support device of the boiler to the operation end to the operation end.
   Boiler operation control device characterized by this.
8. It includes a first branch system that serves as a path for fluid flowing through the heat transfer section of the boiler, and a second branch system that is spatially spaced from the first branch system in the heat transfer section. It ’s a boiler operation simulation method.
   The boiler heat transfer model for calculating the temporary process value generated in the heat transfer unit when the boiler is virtually operated is provided with calculation conditions including temporary input parameters that are assumed to be set in the boiler in the virtual operation. Apply and calculate the first tentative process value generated in the heat transfer section on the first branch system and the second tentative process value generated in the heat transfer section on the second branch system, respectively. Steps and
   A step of outputting the first temporary process value and the second temporary process value, respectively.
   A boiler operation simulation method characterized by including.
9. A boiler operation simulation program for causing a computer to execute the boiler operation simulation method according to claim 8.
10. A recording medium on which the boiler operation simulation program according to claim 9 is recorded.

Images