JP2004316998A - Boiler control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten an adjustment test period; and to improve operation efficiency of a plant by automatically correcting a main steam pressure preset value in plant operation, and dynamically adjusting valve opening of a steam governor valve. <P>SOLUTION: This boiler control device controls fuel supply quantity and a feed water flow rate of a boiler on the basis of a deviation between the main steam pressure preset value and actual steam pressure corresponding to a generator output preset value; determines a valve opening preset value of the steam governor valve from the generator output preset value by a valve opening setting means; determines a valve opening deviation from the valve opening preset value and actual valve opening; arithmetically operates a main steam pressure correction value on the basis of this valve opening deviation by a pressure correction setting means; subtracts the main steam pressure correction value from the main steam pressure preset value; and controls a fuel control valve and a water supply control valve of the boiler on the basis of this deviation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a boiler control device that adjusts a fuel supply amount and a feedwater flow rate based on a main steam pressure.
[0002]
[Prior art]
In a thermal power plant, it can be said that the generator output is substantially determined by the main steam pressure at the inlet of the steam turbine and the opening of the steam control valve. By the way, in a thermal power plant with a constant-pressure boiler, the main steam pressure is kept constant, and the steam turbine control valve is adjusted to control the generator output. The generator output is controlled by fully opening and changing the main steam pressure at the steam turbine inlet together with the generator output set value.
[0003]
As a result, in a thermal power plant equipped with a variable-pressure once-through boiler, by controlling the main steam pressure to follow the main steam pressure set value generated according to the generator output setting, the generator output can be adjusted as required. (See, for example, Patent Document 1).
[0004]
FIG. 7 shows a system configuration diagram of a boiler control device in a thermal power plant including a conventional variable-pressure once-through boiler. In FIG. 7, reference numeral 1 denotes a boiler control device, and reference numeral 2 denotes a boiler (including a furnace). The boiler 2 is supplied with fuel and water controlled by a fuel control valve 3-1 and a water supply control valve 3-2 of a fuel and water supply controller 3, respectively.
[0005]
The main steam generated in the boiler 2 is supplied to a steam turbine 6 through a main steam pipe 4 and a steam control valve 5 to perform expansion work, then condensed by a condenser 7, and then passed through a water supply pipe 8 to be re-boiled. It is configured to return to. The illustration of the condensing pump and the water supply pump is omitted.
[0006]
The generator 9 is driven by the steam turbine 6, and the output of the generator 9 is detected by a generator output detector 11 via an input transformer 10. Here, the output of the generator 9 is represented as d11. Reference numeral 12 denotes a setting device (hereinafter referred to as a generator output setting device) for setting the output d11 of the generator 9. The set value e12 and the generator output d11 are compared and calculated by a subtractor 13, and a deviation signal is output. ε13 is output. The valve opening of the steam control valve 5 is controlled by the deviation signal ε13. Here, the letters d and ε denote the detected value and the deviation signal, respectively, and e denotes a signal other than the detected value such as a set value and the deviation signal, and will be used similarly in the following description.
[0007]
On the other hand, the generator output set value e12 of the generator output setter 12 is input to the main steam pressure setting function unit 14, where the main steam pressure set value e14 corresponding to the input value is generated and output. Reference numeral 15 denotes a main steam pressure detector which is provided in the main steam pipe 4 and detects the pressure of the main steam supplied to the steam turbine. Reference numeral 16 denotes a subtraction unit that obtains and outputs a deviation signal ε16 between the main steam pressure set value e14 and a detection output (hereinafter, referred to as an actual main steam pressure) d15 of the main steam pressure detector 15. The valve openings of the fuel control valve 3-1 and the water supply control valve 3-2 are controlled based on the deviation signal ε16, and the main steam having an appropriate pressure is generated in the boiler 2.
[0008]
However, in the case of the variable pressure once-through boiler control device configured as above, the main steam pressure set value e14 in each load zone is provisionally set in advance, but is finally determined by trial and error through an adjustment test. That is the current situation.
[0009]
[Patent Document 1]
JP-A-2000-111003 (FIG. 3, page 2)
[0010]
[Problems to be solved by the invention]
As described above, the variable-pressure once-through boiler mainly controls the generator output by changing the main steam pressure at the steam turbine inlet together with the generator output set value. Control for quickly suppressing or correcting the residual deviation after the generator output has settled is performed by operating a steam control valve.
[0011]
Therefore, it is necessary to tune to the optimum main steam pressure set value corresponding to the generator output.If the tuning is not appropriate, for example, if the main steam pressure set value is too high for the generator output, the steam If the opening and closing of the control valve is too narrow, the power generation efficiency will be reduced and the power generation efficiency will be low.If the main steam pressure set value is too high for the generator output, the position of the control valve will be too open. It is balanced, and the power generation efficiency is also low. As a result, the adjustment test of the main steam pressure set value was troublesome, and it was difficult to operate the steam control valve to the valve opening with the smallest loss as calculated.
[0012]
The present invention is to automatically correct the main steam pressure set value during the operation of the plant, shorten the adjustment test period by dynamically adjusting the valve opening of the steam control valve, and improve the operation efficiency of the plant. It is an object of the present invention to provide a boiler control device which can be used.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an invention of a boiler control device according to claim 1 sets a generator output, and outputs a generator output set value as a generator output set value. A main steam pressure setting function unit that inputs and outputs a main steam pressure set value corresponding to the input amount, and the generator output set value is input and outputs a steam control valve opening degree signal corresponding to the input amount. Valve opening setting means, a valve opening detector for detecting the valve opening of the steam control valve at the steam turbine inlet and outputting it as an actual valve opening signal, the steam control valve opening signal and the actual valve opening signal And a pressure correction setting means for inputting the valve opening degree deviation signal and outputting a main steam pressure correction value corresponding to the input amount, After calculating the deviation between the steam pressure set value and the main steam pressure correction value and correcting it A subtraction unit that outputs as a steam pressure set value, an actual main steam pressure detector that detects and outputs an actual main steam pressure supplied to the steam turbine, and the corrected main steam pressure set value and the actual main steam pressure value. And a fuel and water supply controller for inputting a deviation signal between the corrected main steam pressure set value and the actual main steam pressure value signal to control the fuel and water supply of the boiler. And
[0014]
According to a fourth aspect of the present invention, there is provided a boiler control device that sets an output of a generator and outputs the output as a generator output set value, and inputs the generator output set value. A main steam pressure setting function unit that outputs a main steam pressure set value corresponding to, and a valve opening setting unit that receives the generator output set value and outputs a steam control valve opening signal corresponding to the input amount. A valve opening detector that detects the actual valve opening of the steam control valve at the steam turbine inlet and outputs it as an actual valve opening signal, and obtains a deviation between the steam control valve opening signal and the actual valve opening signal. A subtraction unit that outputs the valve opening deviation signal to a dead zone element, generates and outputs a main steam pressure correction value corresponding to the output signal of the dead zone element, Pressure compensation configured to extract the output signal of the element Determining means, a subtraction unit for obtaining a deviation between the main steam pressure set value and the main steam pressure correction value and outputting a corrected main steam pressure set value, and detecting an actual main steam pressure supplied to the steam turbine. An actual main steam pressure detector to be output, a subtraction unit that calculates a deviation between the corrected main steam pressure set value and the actual main steam pressure value, and a subtraction unit that calculates a deviation between the corrected main steam pressure set value and the actual main steam pressure value signal. In the boiler control device, comprising a deviation signal input, a fuel and water supply controller for controlling the boiler fuel and water supply, an output signal of the dead zone element output from the pressure correction setting means is input, and an automatic update request is issued. When the output signal of the dead zone element is smaller than a predetermined value in the presence state, the automatic update command is output as the update permission signal, and when the automatic update request does not exist, the manual update command is output as the update permission signal. Do And new permission setting means, by receiving the update permission signal, characterized in that the corrected main steam pressure setpoint provided, and overwriting means for overwriting the main steam pressure setting function.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described. Note that the same reference numerals are given to the same elements throughout the respective drawings, and redundant description will be omitted.
[0016]
(First Embodiment)
FIG. 1 is a configuration diagram showing a first embodiment of a boiler control device according to the present invention. In FIG. 1, the present embodiment differs from the conventional boiler control device shown in FIG. 7 in that the following control system is newly provided.
[0017]
That is, the valve opening detector 20 which detects the valve opening of the steam control valve 5 and outputs it as an actual valve opening signal, and the generator output set value e12 which is inputted and the valve opening set corresponding thereto. A valve opening setting means 21 for generating and outputting a value e21; a subtracter 22 for receiving the valve opening setting value e21 and the actual valve opening signal d20 and outputting a valve opening deviation ε22; A pressure correction setting means 23 for inputting the valve opening deviation ε22 and generating and outputting a corresponding main steam pressure correction value e23, and a correction by subtracting the main steam pressure correction value e23 from the main steam pressure set value e14. A control system including a subtractor 24 for outputting the main steam pressure set value ε24 is newly provided.
[0018]
2A and 2B are a detailed configuration diagram and a characteristic diagram of the valve opening degree setting means 21, respectively. First, the configuration will be described with reference to FIG. In FIG. 2A, reference numeral 25 denotes a valve opening setting function unit which inputs a generator output setting value e12 of the generator output setting device 12 and outputs an automatic valve opening signal e25 corresponding to the input amount. . Reference numeral 26 denotes a manual valve opening setting device that outputs a manual valve opening signal e26 based on an operation from an operator. Reference numeral 27 denotes an automatic valve opening requesting means for outputting an automatic opening request signal e27 in response to an instruction from the operator. When there is an automatic valve opening request, it is turned on (logical value "1"); Outputs OFF (logical value “0”).
[0019]
Reference numeral 28 denotes a bump restaurant spur means, which switches from the manual valve opening signal e26 to the automatic valve opening signal e25 and outputs the same when the automatic valve opening request e27 is turned on. When the opening request e27 is turned off, the automatic valve opening signal e25 is switched to the manual valve opening signal e26 and output. In this switching process, the operation is performed such that the output signal is switched to a predetermined change rate, that is, bumpless, without being switched abruptly. For example, when the automatic valve opening request e27 is turned on in a state where the automatic valve opening signal e25 corresponding to the generator output set value e12 is input to the bump restaurant spare means 28, the manual valve opening signal e26 A valve opening set value e21 having characteristics such that it gradually approaches the automatic valve opening signal e25 at an arbitrarily determined change rate and thereafter coincides with the automatic valve opening signal e25, and conversely, the automatic valve opening request e27 When the valve is turned off, the valve opening set value e21 having characteristics such that the automatic valve opening signal e25 gradually approaches the manual valve opening signal e26 at an arbitrarily determined rate of change, and thereafter matches the manual valve opening signal e26. I do.
[0020]
In FIG. 2B, symbols e27, e25, e26, and e21 assigned to the respective signals correspond to the symbols in FIG. 2A, respectively. As can be seen from this figure, when the automatic valve opening request e27 is off, the bump restoring means 28 outputs a manual valve opening signal e26.
[0021]
When the automatic valve opening request e27 is turned on, the bump restaurant spur means 28 asymptotically approaches the automatic valve opening signal e25 at a predetermined constant rate of change, and then outputs a signal having a consistent waveform.
[0022]
Here, the opening degree setting of the steam control valve 5 is generated according to the generator output setting, but this is only a basic example, and various other valve opening degree setting methods are available. Of course, it is possible.
[0023]
FIG. 3A is a detailed configuration diagram of the pressure correction setting means 23, and FIG. 3B is a characteristic diagram thereof.
First, the configuration will be described with reference to FIG. In FIG. 3 (a), reference numeral 29 denotes a manual correction command means for outputting a manual correction command signal e29 which is turned on or off based on an operation from a central operation room (middle operation) or the like. The set state detector functions to output the output signal e30 (logical value “1”) if the amount of change in the power detected at 11 is equal to or less than an arbitrary set value within an arbitrary time. Reference numeral 31 denotes an AND gate circuit, when the manual correction command signal e29 is ON and the output of the generator 9 is stable and unchanged, that is, when the output e30 of the settling state detector 30 is "1". , And outputs a correction command signal e31 (logical value “1”).
[0024]
On the other hand, the valve opening degree deviation e22 output from the subtractor 22 is input to the proportional constant circuit 33 after a minute change amount smaller than a preset limit value is cut by the dead zone element 32, and is multiplied by K. The pressure correction signal e34 is input to the integration element 34 and integrated as a pressure correction signal e34. The bump restaurant transfer means 35 has the same configuration and function as the bump restaurant transfer means 28. When the output e31 of the AND gate 31 becomes "1", in other words, the correction command signal e31 becomes "1". Then, from the zero output (0) of the zero value setter 36, the pressure correction signal e34 is asymptotically approached at a predetermined change rate, and then the main steam pressure correction value e23 that matches the pressure correction signal e34 is output. When the correction command signal e31 is set to "0", the main steam pressure correction value e23 asymptotically approaches the zero of the zero value setter 36 at an arbitrary predetermined change rate from the pressure correction signal e34 and thereafter becomes equal to zero.
As described above, by inputting the ON / OFF correction command signal to the bump restaurant spur means 35, it is possible to select whether or not to perform the main steam pressure correction.
[0025]
In FIG. 3B, symbols e29, e34, 0 and e23 assigned to the respective signals correspond to the symbols in FIG. 3A. When the manual correction command signal e29 is off, the bump restaurant spare means 35 selects and outputs the output 0 of the zero value setter 36 even if the pressure correction signal e34 is generated from the integrator 34. When the manual correction command signal e29 is turned on, the pressure correction signal e34 asymptotically matches at a predetermined rate of change. When the manual correction command signal e29 is turned off again, it becomes asymptotically close to the zero value (0) at a predetermined rate of change.
[0026]
In the first embodiment, the generator output e12 is input to the settling state detector 30. However, this is only a basic example, and the main steam pressure is also used. Of course, various settling state detection methods are conceivable.
[0027]
Next, the operation of the first embodiment will be described.
During the adjustment test period of the power plant, the main steam pressure set value e14 in each load zone of the generator output is temporarily set in advance, and the boiler fuel water supply control device 3 is set based on the temporarily set main steam pressure set value e14. To drive.
[0028]
In FIG. 2A, when the automatic valve opening request e27 is turned on in a state where the automatic valve opening signal e25 corresponding to the generator output set value e12 is input to the bump restaurant spaer means 28, the bump restaurant spaer is turned on. The valve opening set value e21 output from the means 28 asymptotically approaches the automatic valve opening signal e25 at a rate of change arbitrarily determined from the manual valve opening signal e26, and then outputs an output that matches the automatic valve opening signal e25. Occurs.
[0029]
Then, the valve opening set value e21 is subtracted by the actual valve opening d20 in the subtracting section 22 in FIG. 1, and is input to the pressure correction setting means 23 as a valve opening deviation ε22. In the pressure correction setting means 23 of FIG. 3A, the valve opening deviation ε22 is output from the dead zone element 32 only for an amount exceeding the limit value set in the dead zone element 32. Then, the output is multiplied by K in the proportional coefficient unit 33 and then integrated by the integrating circuit 34 to be input as a pressure correction signal e34 to the bumpless transfer means 35.
[0030]
By turning on the manual correction command e29 while the settling state detector 30 is outputting “1”, the correction command signal e31 is input to the bumpless spaer means 35. As a result, the main steam pressure correction value e23 output from the bump restaurant spear means 35 approaches the pressure correction value e34 from the zero value (0) at a predetermined change rate, and then matches the pressure correction value e34. The main steam pressure correction value e23 is subtracted from the main steam pressure setting value e14, which is the output of the main steam pressure setting function unit 14, by a subtractor 24, and outputs a deviation, that is, a corrected main steam pressure setting value ε24. Then, the corrected main steam pressure set value ε24 is subtracted by the actual main steam pressure d15 in the subtraction unit 16 provided at the subsequent stage, and based on the deviation ε16, the fuel control valve 3-1 of the fuel and water supply controller 3 and The water supply control valve 3-2 is controlled to control the amount of main steam generated from the boiler 2.
[0031]
As described above, according to the first embodiment, by introducing the valve opening degree setting means 21, the steam control valve optimal for the operation efficiency of the boiler control device corresponding to the generator output set value e12 is obtained. The main steam pressure correction value e23 is subtracted from the main steam pressure set value e14 by setting the opening and introducing the pressure correction setting means 23, and the main steam pressure is automatically adjusted so that the valve opening deviation ε22 decreases. Can be corrected.
[0032]
As a result, during the adjustment test period of the power plant, the main steam pressure set value is automatically corrected, the valve opening of the steam control valve is dynamically adjusted, and the adjustment test period is shortened. It is possible to improve operating efficiency.
[0033]
(Second embodiment)
FIG. 4 is a configuration diagram showing a second embodiment of the boiler control device according to the present invention. The main difference between the present embodiment and the first embodiment is that the present embodiment newly adds an update permission setting unit and a main steam pressure setting function overwriting unit to the first embodiment. This is in addition to the point described above and a point that some functions are added to the above-described pressure correction setting means, and the other configurations and functions are the same as those in the first embodiment, and therefore description thereof is omitted.
[0034]
In FIG. 4, reference numeral 23A denotes a pressure correction setting means obtained by adding some functions to the above-described pressure correction setting means 23, and a dead zone element output signal is output from an output stage of a dead zone element 32 incorporated in the pressure correction setting means 23A. e32 is taken out and inputted to the update permission setting means 41 described later. When the update permission signal e41 is output from the update permission setting means 41, the overwriting means 42 functions so as to overwrite the main steam pressure setting function ε24 described above on the main steam pressure setting function. The function of this overwriting is well known and will not be described in detail. However, there are three functions: a main steam pressure setting function value, a corrected main steam pressure setting value to be overwritten, and an overwriting timing (a timing at which an update permission signal is generated). Overrides can be made based on elements.
[0035]
Next, the pressure correction setting means 23A will be described with reference to FIG. FIG. 5A is a detailed configuration diagram of the pressure correction setting means 23A, and FIG. 5B is a characteristic diagram thereof. In FIG. 5A, the pressure correction setting means 23A is configured to extract the output signal e32 from the output stage of the dead zone element 32 of FIG. 3 described above and to connect the second AND gate 43 to the output stage of the AND gate 31. When the AND condition of the output of the AND gate 31 and the inversion signal e44 of the update permission signal e41 is satisfied by the second AND gate 43, a correction command signal is input to the bumpless transfer means 35. It is configured.
[0036]
Therefore, when the update permission signal e41 is on, the main steam pressure correction value e23A is not output from the pressure correction setting unit 23A, and the main steam pressure correction value e23A is output when the update permission signal e41 is off. It has become. Reference numeral 44 denotes a knot circuit for inverting the polarity of the update permission signal e41.
[0037]
Next, a characteristic diagram will be described with reference to FIG. In FIG. 5B, symbols e41, e31, e43, e34, 0, and e23A assigned to the respective signals correspond to the symbols in FIG. 5A. As can be seen from this figure, when the manual correction command signal e29 and the output e30 of the settling state detector 30 are both turned on, the correction command signal e43 is turned on on the condition that the update permission signal e41 is turned off. The main steam pressure correction value e23A, which was previously the zero value (0), is output as a characteristic that asymptotically matches the pressure correction signal e34 from the zero value (0). The subtractor 24 subtracts the main steam pressure correction value e23A from the main steam pressure set value e14 to generate a corrected main steam pressure set value e24. The corrected main steam pressure set value e24 is compared with the actual steam pressure d15 by the subtractor 16, and is input to the fuel and water supply controller 3 as a deviation ε16.
[0038]
Thereafter, when the update permission signal e41 is turned on, one gate input of the second AND gate circuit is set to “0” by the knot circuit 44, and the correction command signal e43 is also set to “0”. As a result, the bump restoring means 35 changes from the pressure correction signal e34 at a predetermined change rate so as to gradually approach zero value (0), and thereafter becomes zero value (0). Thereafter, when the update permission signal e41 is turned off again, the correction command signal e43 is turned on again, and the bump restoring means 35 asymptotically approaches the pressure correction signal e34 from a zero value (0) at a predetermined change rate, and thereafter changes so as to coincide with the pressure correction signal e34. I do.
[0039]
Next, the update permission setting means 41 will be described with reference to FIG. FIG. 6A is a detailed configuration diagram of the update permission setting unit 41, and FIG. 6B is a characteristic diagram thereof.
First, the detailed configuration of the update permission setting means 41 will be described with reference to FIG. The update permission setting unit 41 is configured to switch between the automatic update instruction e51 and the manual update instruction e54 of the manual update instruction unit 54 based on the automatic update request e45 of the automatic update request unit 45. The output signal e32 of the element 32, the zero value (0) of the zero value setter 52, and the output signal e32 of the dead zone are compared, and when both are substantially equal, in other words, when the output signal e32 of the dead zone element is almost zero, the automatic update is performed. The command e51 is input to the signal switch 53. The signal switch 53 is configured to output an automatic update command e51 when the automatic update request e45 is on, and to output a manual update command e54 when the automatic update request e45 is off.
[0040]
Next, a characteristic diagram will be described with reference to FIG. In FIG. 6B, symbols e45, e32, e51, e54, and e41 assigned to the respective signals correspond to the symbols in FIG. 6A, respectively.
[0041]
In FIG. 6B, when the automatic update request e45 is off, the signal switch 53 outputs a manual update command e54. Therefore, if the manual update command e54 is turned on or off, an update permission command is issued according to the update command. e41 is output. When the dead zone element output signal e32 becomes zero (0) after the automatic update request e45 is turned on, the automatic update instruction e51 is output as the update permission instruction e41 from that point.
[0042]
Next, the operation of the second embodiment will be described.
In FIG. 6A, before the automatic update request e45 is output from the middle operation or the like to the boiler control device, the switching unit 53 selects the manual update command e54 and outputs it as the update permission command e41. At this time, in the pressure correction setting unit 23A of FIG. 5A, the second AND gate 43 is turned on / off by an update permission signal e41 based on a manual update command e54. When the update permission signal e41 is off, the second AND gate 43 is turned on when the manual correction command signal e29 is issued and the condition of the generator output is settled (state where there is no change in the rated value). Therefore, the bump restaurant transfer means 35 outputs the integrated pressure correction signal e34 as the main steam pressure correction value 23A.
[0043]
Thereafter, the automatic update request e45 is output to the boiler control device from the middle operation or the like, and when the update permission signal e41 is generated, if the output e32 of the dead zone element 32 is substantially zero, that is, the valve opening deviation is substantially zero. The automatic update command e51 of the comparator 51 is output as the update permission command e41 “1” through the signal switch 53. In FIG. 5A, the update permission command e41 is inverted in polarity by the knot circuit 44 and becomes a signal e44 of "0", which is input to the second AND gate 43.
[0044]
Therefore, when the automatic update request e45 is output, the correction command signal e43 output from the second AND gate 43 becomes “0”, and the bump restaurant spaer means 35 outputs the pressure correction signal e34 at an arbitrary predetermined change rate. , The main steam pressure correction value 23A is output so as to asymptotically approach the zero value (0) by the zero value setting device 36 and eventually reach the zero value (0).
[0045]
On the other hand, in FIG. 4, when the update permission command e41 is output from the update permission setting means 41 based on the automatic update request e45, the overwriting means 42 operates to change the corrected main steam pressure set value e24 to the main steam pressure. The setting value e14 of the setting function unit 14 is overwritten.
[0046]
Then, when the automatic update request e45 is turned off after the completion of the overwriting, the signal switch 53 switches again from the automatic update instruction e51 to the manual update instruction e54, but if there is no manual update signal ("0"), the main switching is performed. The steam pressure set value is not updated, but only the main steam pressure is corrected by the main steam pressure correction value e23.
[0047]
In FIG. 5 (a), the valve opening deviation e22 is input to the dead zone element 32, and is multiplied by K in the proportional constant circuit 33 only for the value exceeding the limit value, and then integrated by the integration circuit 34 to become a pressure correction signal e34. Is input to the bump restaurant spur means 35.
[0048]
In the state where the manual correction command signal e29 and the settling state detector signal e30 are both output and the update permission signal e41 is not output, the bump restaurant spare means 35 sets the pressure correction signal e34 as the main steam pressure correction value e23A. The output is performed to correct the main steam pressure in the subtraction unit 24. When the update permission signal e41 is output, the main steam pressure correction value e23A outputs zero. That is, when the update permission signal e41 is output and the main steam pressure setting function is updated, the correction of the main steam pressure in the subtraction unit 24 is stopped.
[0049]
Then, as in the case of the first embodiment, the fuel control valve of the fuel supply controller 3 is based on the deviation ε16 between the corrected main steam pressure set value e24 output from the subtractor 24 and the actual main steam pressure d15. 3-1. Control the water supply control valve 3-2.
[0050]
As described above, according to the present embodiment, when the dead zone output e32 input from the pressure correction setting unit 23A to the update permission setting unit 41 is zero, the automatic update command is output, and When the automatic update command is output, the corrected main steam pressure set value is overwritten on the main steam pressure setting function to automatically correct the main steam pressure set value and dynamically adjust the valve opening of the steam control valve. It is possible to shorten the adjustment test period and to improve the operation efficiency of the plant by adjusting to.
[0051]
【The invention's effect】
As described above, according to the present invention, the adjustment test period is shortened by automatically correcting the main steam pressure set value during the plant operation and dynamically adjusting the valve opening of the steam control valve, and It is possible to improve the operation efficiency of the plant.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a boiler control device according to a first embodiment of the present invention.
2A is a detailed configuration diagram of a valve opening degree setting unit, and FIG. 2B is a characteristic diagram thereof.
3A is a detailed configuration diagram of a pressure correction setting unit, and FIG. 3B is a characteristic diagram thereof.
FIG. 4 is a configuration diagram showing a boiler control device according to a second embodiment of the present invention.
5A is a detailed configuration diagram of a pressure correction setting unit, and FIG. 5B is a characteristic diagram thereof.
6A is a detailed configuration diagram of an update permission setting unit, and FIG. 6B is a characteristic diagram thereof.
FIG. 7 is a configuration diagram showing an example of a conventional boiler control device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Boiler control apparatus, 2 ... Boiler, 3 ... Fuel and water supply controller, 4 ... Main steam pipe, 5 ... Steam control valve, 6 ... Steam turbine, 7 ... Condenser, 8 ... Water supply pipe, 9 ... Generator Reference numeral 10: input transformer, 11: generator output detector, 12: generator output setter, 13: subtractor, 14: valve opening setting function device, 15: main steam pressure detector, 16: subtractor, 20: valve opening detector, 21: valve opening setting means, 23: pressure correction setting means, 24: subtractor, 25: valve opening setting function device, 26: manual valve opening setting device 27: automatic valve opening Degree request, 28: bump restaurant spur means, 29: manual correction command signal, 30: settling state detector, 31: AND gate, 32: dead zone element, 33: proportional coefficient unit, 34: integrator, 35: bump restaurant spuff Means, 36: Zero value setter, 41: Update permission setting means, 4 ... override means, 43 ... AND gates, 44 ... NOT circuit, 45 ... automatic update requesting means, 51 ... comparator, 52 ... zero value setter 53 ... signal switch.

Claims (7)

A generator output setter that sets the output of the generator and outputs the output as a generator output set value;
A main steam pressure setting function unit that inputs the generator output set value and outputs a main steam pressure set value corresponding to the input amount;
A valve opening setting means for inputting the generator output set value and outputting a steam control valve opening signal corresponding to the input amount;
A valve opening detector that detects the valve opening of the steam control valve at the steam turbine inlet and outputs it as an actual valve opening signal;
A subtraction unit that obtains a deviation between the steam control valve opening signal and the actual valve opening signal and outputs it as a valve opening deviation signal;
Pressure correction setting means for receiving the valve opening degree deviation signal and outputting a main steam pressure correction value corresponding to the input amount;
A subtraction unit that obtains a deviation between the main steam pressure set value and the main steam pressure correction value and outputs the corrected main steam pressure set value as a corrected main steam pressure set value;
An actual main steam pressure detector that detects and outputs the actual main steam pressure supplied to the steam turbine;
A subtraction unit that calculates a deviation between the corrected main steam pressure set value and the actual main steam pressure value,
A fuel and water supply controller for controlling the boiler fuel and water supply by inputting a deviation signal between the corrected main steam pressure set value and the actual main steam pressure value signal,
Boiler control device. 2. The boiler according to claim 1, wherein the valve opening setting means includes means for switching a valve opening set value to automatic generation or manual generation in accordance with ON or OFF of an automatic valve opening request signal. Control device. 2. The boiler control device according to claim 1, wherein said pressure correction setting means includes means for automatically starting main steam pressure correction when it is determined that the generator output has reached a settling state. A generator output setter that sets the output of the generator and outputs the output as a generator output set value;
A main steam pressure setting function unit that inputs the generator output set value and outputs a main steam pressure set value corresponding to the input amount;
A valve opening setting means for inputting the generator output set value and outputting a steam control valve opening signal corresponding to the input amount;
A valve opening detector that detects the actual valve opening of the steam control valve at the inlet of the steam turbine and outputs it as an actual valve opening signal;
A subtraction unit that obtains a deviation between the steam control valve opening signal and the actual valve opening signal and outputs it as a valve opening deviation signal;
This valve opening deviation signal is input to a dead zone element, a main steam pressure correction value corresponding to the output signal of the dead zone element is generated and output, and a pressure correction setting configured to take out the output signal of the dead zone element. Means,
A subtraction unit that calculates a deviation between the main steam pressure set value and the main steam pressure correction value and outputs a corrected main steam pressure set value,
An actual main steam pressure detector that detects and outputs the actual main steam pressure supplied to the steam turbine;
A subtraction unit that calculates a deviation between the corrected main steam pressure set value and the actual main steam pressure value,
A fuel and water supply controller for controlling the boiler fuel and water supply by inputting a deviation signal between the corrected main steam pressure set value and the actual main steam pressure value signal,
In the boiler control device consisting of
The output signal of the dead zone element output from the pressure correction setting means is input, and when the output signal of the dead zone element is equal to or smaller than a predetermined magnitude in the state where the automatic update request exists, the automatic update command is output as the update permission signal And an update permission setting unit 41 that outputs a manual update command as an update permission signal when there is no automatic update request.
Overwriting means for receiving the update permission signal and overwriting the corrected main steam pressure set value on the main steam pressure setting function,
A boiler control device comprising: The apparatus according to claim 4, wherein the update permission setting means includes means for turning on an automatic update command when a deviation between the valve opening set value and the actual valve opening signal enters a dead zone. Boiler control device. The boiler control device according to claim 4, wherein the update permission setting means includes means for switching an update permission command to automatic generation or manual generation by turning on or off an automatic update request. The power plant control device according to claim 4, wherein the pressure correction setting means includes means for stopping main steam pressure correction when the main steam pressure setting function is updated.

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