KR19980047219A - Cooperative Control Device of Boiler and Turbine in Mechanical Power Generation - Google Patents

Abstract

The present invention integrates the main steam pressure control of boilers and the governor control of turbines into the CRT (Cathode Ray Terminal) to cooperatively control the boilers and turbines provided for the energy generation. A control apparatus, comprising: a cooperative control apparatus for a boiler and a turbine, which is provided in a power generation system that integrates and controls a turbine governor for controlling the output of a generator in a generator system and a boiler master for controlling the main steam pressure of the boiler. Set the target load value of the generator, and output the load set value which is gradually changed at the change rate set to the target value, and add the output frequency adjustment value of the generator to the load set value outputted from the output request unit. An output request upper and lower limit setting unit for restricting the set value to fall within a predetermined upper and lower limit ranges, and the output request upper and lower limit settings After calculating the load adjustment value according to the load set value adjusted to the output frequency applied through, calculates the pressure adjustment value according to the pressure set value, the control signal integrating the load adjustment value and the pressure adjustment value turbine The unit control unit is provided to the governor and the boiler master.

Description

Cooperative Control Device of Boiler and Turbine in Mechanical Power Generation

The present invention relates to a control system for a power generation, and more particularly, to integrate the main steam pressure control of the boiler and the governor control of the turbine to the CRT (Cathode Ray Terminal) to efficiently control each other. It relates to the politics of the cooperation of boilers and turbines that can be provided in the power generation.

In general, power generation generates power such as electricity by using thermal energy of steam, and is a combination of a BOILER, a steam turbine, a generator, and other auxiliary equipment. The basic cycle of STEAM AND POWER PLANT is constructed. The steam power plant is composed of a unit system in which a steam generator, a boiler, a turbine, and a generator are combined, respectively.

In FIG. 3, the boiler 1 is supplied with controlled fuel and air to generate main steam at a constant pressure (about 127 kg / cm 2) and a constant temperature (about 538 ° C.), and is generated in the boiler 1. The main steam is supplied to the turbine (3), the turbine (3) is rotated, and the steam whose temperature and pressure is lowered is reheated to restore the predetermined pressure and temperature, and then applied to the low pressure turbine (4), Rotate the low pressure turbine (4). The rotational force of the turbine 2 and the low pressure turbine 3 rotates the generator 5 to generate a predetermined electric power. Then, the steam rotated by the low-pressure turbine 4 is condensed by the condenser and supplied to the boiler 1 by the condensation pump 8 again. In addition, the uncondensed steam in the condenser is discharged out through the exhaust chamber.

Conventionally, in the above-described electromotive power generation process, as shown in FIG. 1, in order to control the steam pressure of the boiler 1 constantly, the boiler master 11 makes the main steam pressure of the boiler match the set value pressure. The turbine governor controller 14 controls the controller 12 and the air controller 13 to increase and decrease the fuel flow rate and the air flow rate, while controlling the output MW of the generator 5 constantly. ) Opens and closes the turbine governor 2 so as to match the set value, thereby increasing or decreasing the amount of steam flowing into the turbine 3.

That is, when the set value output of the turbine governor controller 14 is changed to change the output of the generator 5, the turbine governor 2 moves to change the amount of steam flowing into the turbine 3, and then the equivalent of the boiler 1 The evaporation amount is changed to change the main steam pressure of the boiler (1). The boiler master 11 adjusts the fuel control valve 4 and the air control damper 6 to match the main steam pressure to the set value.

However, in the conventional EMF control system, since the boiler control system and the turbine governor control system are separated from each other, when the generator output changes, the main steam flow rate and pressure change, and then the boiler fuel and air volume change in three stages. The control time is not only delayed due to the operation of the furnace, but even if only one element of the generator output, main steam flow rate and pressure, boiler fuel amount, and air volume changes, the entire control system is hunted, causing equipment trouble. There was a problem.

The present invention has been made to solve the problems of the conventional EMF control device, its purpose is to integrate the control system of the boiler and the turbine of the electromotive power into the CRT, the interrelated control is made to disturb the control of the turbine generator and boiler The present invention is to provide a cooperative control device for a boiler and a turbine provided in the nuclear power plant that can respond quickly to.

FIG. 1 is a block diagram showing a control device of a boiler and a turbine in a conventional oscillation.

2 is a block diagram showing a cooperative control device for a boiler and a turbine according to the present invention.

3 is a schematic process diagram of the power generation.

* Description of the symbols for the main parts of the drawings *

20: Output request section 30: Output request upper and lower setting section

40: unit control unit 21: load target value setter

23: change rate setter 31: frequency detector

32: Function generator 34: Load demand limit

36: Upper limit setter 37: Load request lower limiter

39: Lower limit setter 41: Output detector

42: generator output controller 44: upper and lower limiters

54: main steam pressure setter 55: boiler master

56: fuel controller 57: air controller

58: main steam pressure detector

22, 24, 35, 38, 53: Analog memory 25, 52: Limit of change rate

33,43,45,51: summer 46,47 changer

48, 49, 50: pressure controller

As a technical means for achieving the object of the present invention as described above, the present invention is to the power generation to integrate and control the turbine governor for controlling the output of the generator in the power plant and the boiler master for controlling the main steam pressure of the boiler. A cooperative control device for a boiler and a turbine provided, comprising: an output requesting unit for setting a target load value of a generator, and outputting a load setting value gradually changed at a change rate set to the target value, and outputted from the output requesting unit; The output request upper and lower limit setting unit for limiting the set value obtained by adding the output frequency adjustment value of the generator to the load set value and falling within a predetermined upper and lower range, and the load set value adjusted to the output frequency applied through the output request upper and lower limit setting unit. After calculating the load adjustment value, calculating the pressure adjustment value according to the pressure set value, the load adjustment value and the And a control signal integrating force adjustment, characterized in that the control unit includes a unit to be applied to the master boiler and a turbine governor.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

2 is a block diagram showing a cooperative control device for a boiler and a turbine according to the present invention, which is operated by an operator to generate a constant increase / decrease signal every time it is pressed, and an increase button 21a and a decrease button 21b. The analog memory 22, the increase button 23a, and the decrease button 23b which apply the increase / decrease signal from the load target value setter 21 and the load target value setter 1 to the change rate limiter 25. And a change rate setter 23 for outputting a change rate increase and decrease signal according to an operator's operation, and an analog memory 24 and the analog memory for applying change rate increase and decrease signals of the change rate setter 23 to the change rate limiter 25. An output request unit 20 comprising a change rate limiter 25 for limiting the load target value applied from 22 to a change rate input from another analog memory 24, and a frequency detector 31 for detecting an output frequency. ) And above A function generator 32 for adjusting the output data of the input frequency detected by the frequency detector 31 and an output signal set value input from the function generator 32 through the change rate limiter 24 are added up. The upper limit limiter 36 and the upper limit increase / decrease signal applied from the upper limit setter 36 are configured by the summer 32 and increase and decrease buttons 36a and 36b. An upper limit limiter 34 for determining an upper limit of an output signal of the summer 33 and an increase and decrease buttons 39a and 39b for setting the lower limit of the required load The summation unit (A) stores the lower limit setter (39) and the lower limit set value increase and decrease signal from the lower limit setter (39) to the lower limit controller (37). 33. Lower limit of output signal Is an output request upper and lower limit set section 30 consisting of a lower limiter 37, an output detector 41 for detecting the output MW of the generator, and a generator output detected by the output detector 41 and the output command. Deviation signal from the output controller 52 and the output controller 52 outputting the deviation signal by proportionally integrating the set value applied from the upper and lower limit setting unit 30 and the setting value from the output command upper and lower limit setting unit 30. The control signal and the first switch passing through the upper and lower limiters 44 and the upper and lower limiters 44 for limiting the upper and lower limits of the output signal of the summer 43 47, a second switch for applying the control signal from the summer 45 or the control signal from the second pressure controller 50 to the turbine governor 20; Section 1 which transmits the control signal from the 46 and the first pressure controller 48 to the summer 45. A first pressure controller 48, a second pressure controller 50, which outputs a deviation between the detected pressure value by the ventilation 47 and the pressure detector 63 and the pressure set value applied through the change rate limiter 62; A total pressure 51 and a pressure set value for adding the deviation signal from the third pressure controller 49, the deviation signal from the third pressure controller 49, and the output signal from the summer 43 to the boiler master 55. The pressure of the analog memory 53 and the main steam to gradually change the pressure change controller 52 and the set pressure set value to the first, second, third pressure controller 49 and the set pressure set value to the change rate limiter 52. In accordance with the control of the boiler master 55 and the boiler master 55 to control to adjust the fuel and air flow in accordance with the control signal applied from the main steam pressure setter 54 and the summer 51 to set the According to the control of the fuel controller 56 and the boiler master 55 to adjust the fuel flow rate And a control unit (40) comprising the air controller 57 and a pressure detector 58 for detecting the pressure of the main steam to adjust the air flow rate.

And, the configuration as described above is a cooperative control device of the boiler and turbine is installed in the CRT.

Operation by the above configuration is performed as follows.

When the target output value is requested by the load target value setter 21, the load change rate up to the target output load is determined by the change rate limiter 24, and the set value of the load is applied to the summer 33. The change rate of the change rate limiter 24 may be increased or decreased by operating the increase / decrease buttons 23a and 23b set in the change rate setter 25.

This output load setting value is added to the detection frequency value of the frequency detector 31 through the function generator 32 in the summer 33, and then the upper and lower limit ranges set by the upper and lower limiters 34 and 37. After being limited not to exceed, only signals within the range are applied to the unit control unit 40.

The upper and lower limiters 34 and 37 are intended to prevent sudden changes due to excessive load demands, and by adjusting the load output demands according to the frequency change, the boiler master 55 and the turbine for the frequency change. The control of the governor 2 can be performed at the same time, thus increasing the speed stress of the unit control against frequency change.

The upper and lower limits set by the upper and lower limiters 34 and 37 operate the increase and decrease buttons 36a and 36b and 39a and 39b provided in the upper limit setter 36 and the lower limit setter 39. The operator can increase or decrease it arbitrarily.

The output set value adjusted to the detection frequency within the upper and lower limit ranges through the upper and lower limit control limits 34 and 37 is input to the output controller 42, and the output controller 42 outputs the output set value and the output detector 41. The deviation signal is applied to the summer 43 in comparison with the output value MW of the generator (3rd FIG. The summer 43 adds the deviation signal from the output controller 42 and the output setting value adjusted to the detection frequency applied from the output request upper and lower limit setting unit 30 to output.

The output control signal obtained by adding the deviation signal between the set value and the detected output value output from the adder 43 is applied to the adder 45 within the range not exceeding the set range through the upper and lower limiters 44, The signal is summed with the deviation signal between the detected pressure from the pressure detector 58 calculated by the first pressure controller 48 by the summer 45 and the pressure set value from the change rate limiter 52. It is input to the two-switch 46.

The second switch 46 applies the signal from the summer 45 or the signal from the second pressure controller 50 to the turbine governor 46, which is normally applied from the summer 45. The control signal in consideration of the pressure of the main steam and the generator output is applied to the turbine governor 2 so that the pressure and the generator output of the main steam can be controlled at the same time. The signal from the pressure controller 50 is applied to the turbine governor 2 as a control signal to control only the main steam pressure. This makes it possible to stabilize the power generation facilities of the boiler and the turbine generator early in the event of a boiler failure.

When the target value of the pressure is set by the main steam pressure setter 54, the target value of the pressure is applied to the change rate limiter 52 through the analog memory 53. The set pressure value at which the target value approaches the constant change rate by the change rate limiter 52 is applied to the first, second and third pressure controllers 48, 50 and 49, wherein the third pressure controller ( 49 outputs a deviation between the set value applied from the change rate limiter 52 and the current pressure value detected from the pressure detector 58, and this deviation signal is added by the summer 51 to the summer 43; It is added to the output control signal of the generator output from the and is applied to the boiler master (55).

The boiler master 55 controls the fuel controller 56 and the air controller 57 at the same time according to the control signal applied from the summer 51 to adjust the amount of fuel and the amount of air flowing into the boiler.

In the above description, the boiler master 55 may simultaneously integrate the third pressure controller 49 and the output controller 42 of the generator to simultaneously operate the fuel amount, the air amount, and the turbine governor when the load output (MW) is required. have.

As described above, the present invention not only has the effect of stabilizing the unit control system early but also when the turbine governor follows the boiler pressure or the generator output when a problem occurs in one of the turbine governor and the boiler control system of the electromotive power generation. In the turbine governor and the boiler master is controlled at the same time according to the generator output and the main steam pressure, there is an effect that can respond quickly to disturbances.

Claims (4)

In a cooperative control device of a boiler and a turbine provided in the power generation to integrate and control the turbine governor for controlling the output of the generator in the power generation facility and the boiler master for controlling the main steam pressure of the boiler, An output request unit for setting a target load value of the generator and outputting a load setting value gradually changed at a change rate set to the target value; An output request upper and lower limit setting unit for limiting the set value to fall within a predetermined upper and lower limit range by adding the output frequency adjustment value of the generator to the load setting value output from the output requesting unit; Calculate the load adjustment value according to the load setting value adjusted to the output frequency applied through the output request upper and lower limit setting unit, calculate the pressure adjustment value according to the pressure setting value, and then integrate the load adjustment value and the pressure adjustment value. A cooperative control device for a boiler and a turbine provided in a nuclear power generation, characterized in that the unit control unit for applying a control signal to the turbine governor and the boiler master. The method of claim 1, wherein the output request unit A load target value setter having an increase button and a decrease button to output a increase / decrease signal of the load target according to the operation of the button, a first analog memory for applying the increase / decrease signal output from the load target value set value to a change rate limiter, and an increase button; And a change rate setter for outputting a change rate increase / decrease signal according to the button operation, a second analog memory for outputting a change rate adjustment signal from the change rate setter as a change rate limiter, and a first analog memory applied from the first analog memory. And a change rate limiter for varying and outputting a load set value at a rate of change from the second analog memory so as to become a load target value. The output upper and lower limit setting unit of claim 1, wherein A frequency detector for detecting an output frequency of the generator, a function generator for adjusting a frequency from the frequency detector, a summer for adding a load set value output from the output request unit to a frequency value from the function generator, and the summation; An upper limit limiter for limiting an upper limit of an output value, a third analog memory for storing a set upper limit value, an upper limit setter for applying an increase / decrease button and applying an upper limit adjustment signal according to the button operation to the third analog memory; A lower limit setting for limiting the lower limit of the output value of the summer, a fourth analog memory for storing the lower limit setting value, and an increase / decrease button and a lower limit setting signal for outputting the lower limit adjustment signal according to the button operation to the fourth analog memory; Cooperative fan apparatus of a boiler and a turbine provided in the power generation characterized in that it comprises a machine. The method of claim 1, wherein the unit control unit A generator output detector for detecting an output load of a generator, an output controller for calculating a deviation between a load detected by the generator output detector and a load setting value applied from the output demand upper and lower limit setting unit, and the output request upper and lower limit setting unit. A first summer for adding the deviation value from the output controller to a load set value, a pressure setter for setting a pressure value of a target main steam, a fifth analog memory for storing the pressure set value set by the pressure set value; A change rate limiter for outputting a pressure setting value gradually changed to a pressure setting value stored in the analog memory, a pressure detector for detecting a pressure of the main steam by the current boiler, a current pressure value detected by the pressure detector, First, second and third pressure controllers for determining a deviation of the pressure set value from the change rate limiter, respectively; The upper and lower limiters for limiting the upper and lower limits of the output value from the diffuser, the first switch for transmitting the deviation by the first pressure controller to the second summer, and the deviations applied from the first switch to the output values of the upper and lower limiters. A second convertor for applying a control signal to a turbine governor as a control signal and an output value from the second summer controller or a deviation value from the second pressure controller; and a third pressure to the output value of the first summer calculator. 3. A cooperative control device for a boiler and a turbine provided in a power generation, characterized by comprising a third summer for adding the deviation values from the controller to the boiler master as a control signal.