JP3699735B2 - Control device for gas turbine equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a gas turbine equipment control apparatus suitable for controlling a gas turbine equipment as a private power generation equipment.
[0002]
[Prior art]
Normally, establishments such as steelworks have in-house power generation facilities, and the power and steam generated by the in-house power generation facilities are used. As for the power, the power purchased from the power company and the power generated by the in-house power generation facilities are used. It's a good idea.
[0003]
FIG. 6 shows a system diagram of a gas turbine facility that is a private power generation facility.
[0004]
The gas turbine equipment includes an intake duct 1, an air compressor 2, a combustor 3, a gas turbine 4, a governor 5, an exhaust heat recovery boiler 6, a steam turbine generator 7, a fuel supply unit 8, and a gas turbine control hydraulic control device. 9, the high-temperature gas pipe 10, the exhaust duct 11, the gas turbine generator 12, the fuel control valve 13, the first valve 14, the second valve 15, the surplus gas discharge unit 16, the boiler 17, the third valve 18, etc. It is connected to the in-house manufacturing facility 20.
[0005]
In this figure, air as a working fluid passes through the intake duct 1 from the atmosphere, is absorbed by the air compressor 2, is compressed there, and is sent to the combustor 3.
[0006]
In the combustor 3, a part of the compressed air becomes combustion air and reacts with the gas fuel from the fuel supply unit 8. That is, the gas turbine control hydraulic pressure control device 9 controls the opening degree of the fuel control valve 13 according to the increase / decrease of the opening signal of the speed governor 5 and supplies gas fuel from the fuel supply unit 8 to the combustor 3. Then, the combustor 3 reacts with the compressed air and the gas fuel, and the working fluid air is heated and mixed with the combustion exhaust heat gas to become a high-temperature gas.
[0007]
This high-temperature gas enters the gas turbine 4 through the high-temperature gas pipe 10, drives the gas turbine generator 12 to generate power, and supplies power to the load of the in-house manufacturing facility 20. After the hot exhaust gas that has worked in the gas turbine 4 expands, the exhaust heat recovery boiler 6 generates steam through the exhaust duct 11.
[0008]
The steam generated by the exhaust heat recovery boiler 6 is sent to the combustor 3 through the third valve 18, and the steam is injected into the high-temperature combustion gas, and the temperature is adjusted by increasing or decreasing the steam. That is, the temperature control in the combustor 3 is controlled by injecting steam into the high-temperature combustion gas.
[0009]
On the other hand, the high-temperature gas containing excess carbon dioxide and nitrogen oxide used by the exhaust heat recovery boiler 6 is released from the excess gas discharge unit 16 into the atmosphere.
[0010]
When the demand for private power increases, the gas fuel from the fuel supply unit 8 increases and the combustor 3 becomes hot. Accordingly, steam is supplied from the exhaust heat recovery boiler 6 to adjust the temperature of the combustor 3. At this time, when the steam from the exhaust heat recovery boiler 6 is insufficient, the steam injection amount of the steam turbine generator 7 generated in the boiler 17 is supplemented via the first valve 14 from the bleed line, but the first valve When the amount of steam from 14 is insufficient, the opening and closing of the second valve 15 of the line of the in-house manufacturing facility 20 is controlled to adjust the supply of steam to the in-house manufacturing facility 20 and the shortage is injected into the combustor 3 as injection steam. Supply.
[0011]
[Problems to be solved by the invention]
By the way, in the control apparatus of the gas turbine equipment shown in FIG. 6 described above, there is the following problem at the time of sudden increase or decrease in power demand.
[0012]
First, in general, the maximum power contract value with the power company is determined for the purchased power from the power company, and if it exceeds the maximum power contract value, an additional fee must be paid. For this reason, the operation of private power generation facilities is required to be within the maximum power contract value. Therefore, in the gas turbine facility, the gas turbine 4 is often operated with extremely large load fluctuations such as rapid load increase or load decrease according to the power demand in the station.
[0013]
For example, when a large rolling mill or the like, which is an on-site facility, is activated, the maximum amount of power is generated by supplying the maximum amount of fuel to supplement the power demand of the gas turbine facility.
[0014]
When the gas fuel is suddenly changed with a sudden increase in the load, the gas turbine inlet temperature suddenly changes accordingly. When the inlet temperature of the gas turbine 4 changes, the temperature of each part of the high temperature part such as the inner wall surface of the combustor 3 and the turbine rotor blade, stationary blade, rotor, casing, etc. changes, and thermal stress is generated. In order to prevent this, the conventional control apparatus injects steam so as to suppress the temperature rise of the combustor 3 by the gas turbine inlet temperature, but the response is poor and the temperature in the combustor 3 can be sufficiently controlled. There wasn't.
[0015]
When the temperature change in the combustor 3 is large, the generated thermal stress is also increased, and when the temperature change continues repeatedly, there is a problem that the thermal fatigue is increased and the life of the high temperature part is significantly shortened.
[0016]
Further, from the exhaust heat recovery boiler 6 shown in FIG. 6, the carbon dioxide exhaust gas is released to the atmosphere through the surplus gas discharge part 16 at the time of sudden change of electric power load, which is not an environmentally favorable situation.
[0017]
Further, when the gas turbine 4 is operated at a high load, a large amount of injected steam is required, the steam of the exhaust heat recovery boiler 6 is insufficient, and steam is supplied from the steam turbine generator 7 side. If the amount of steam is insufficient, private power generation will be reduced, and purchased power will increase.
[0018]
Therefore, the present invention provides a control device for gas turbine equipment that suppresses temperature changes in the combustor as much as possible with sudden increase or decrease in power load, minimizes the emission of carbon dioxide exhaust gas to the atmosphere, and achieves efficient energy operation. The purpose is to do.
[0019]
[Means for Solving the Problems]
According to the first aspect of the present invention, a gas turbine system for generating electric power by driving a gas turbine by generating a high-temperature gas in a combustor using compressed air and gas fuel by an air compressor and injecting the high-temperature gas into a gas turbine. A high-temperature exhaust gas discharged from the gas turbine system to the exhaust heat recovery boiler to generate steam, and surplus gas from the exhaust heat recovery boiler system to the supply water heating tank to supply the supply water Heating make-up water in a heating tank and sending the heated water to a waste exhaust heat recovery boiler to generate steam, and also to a waste heat recovery boiler system with an air surplus gas discharge part that discharges surplus exhaust gas to the atmosphere, and to the facility inside In a control device for controlling a gas turbine facility comprising a steam line system for supplying steam, a governor is opened by increasing or decreasing the power generation load of the gas turbine system. In response to the signals of increasing or decreasing controls the compressed air and gas fuel supplied to the combustor Output control signal On the other hand, when power load suddenly increases , To suppress the discharge of the atmospheric excess carbon dioxide gas discharged from the atmospheric excess gas discharge part By increasing or decreasing the control signal Gas fuel supply determination unit that controls the compressed air and the gas fuel by increasing / decreasing, and the waste heat recovery boiler system based on the inlet temperature of the gas turbine and the gas fuel when there is a margin in the inlet temperature of the gas turbine A temperature control determination unit that controls the waste heat to be supplied to the waste heat recovery boiler system or the waste heat recovery based on the inlet temperature of the gas turbine, the gas fuel, and a preset gas turbine set temperature And a selection determining unit that selects and injects each steam of the boiler system or the steam line system to set the inside of the combustor to an optimum temperature.
[0020]
According to a second aspect of the present invention, in the gas turbine equipment control apparatus according to the first aspect, the gas fuel supply determination unit corresponds to an increase / decrease in the governor opening signal due to an increase / decrease in the power generation load of the gas turbine system. A signal conversion unit that outputs a control signal for controlling the compressed air and the gas fuel, and that inputs a governor opening signal and converts it into a corresponding amount of the corresponding first gas fuel supply amount by a predetermined function. And a signal input unit that inputs an atmospheric discharge surplus carbon dioxide gas amount detection signal and converts it into a corresponding amount of the corresponding second gas fuel supply amount by a predetermined function, and when the power load suddenly increases , Comparing the equivalent amount of the first gas fuel supply amount with the equivalent amount of the second gas fuel supply amount, the equivalent amount of the first gas fuel supply amount is equal to the second gas fuel supply amount. Greater than in case of, The control signal is increased / decreased so as to increase the gas fuel, and the equivalent amount of the first gas fuel supply amount is smaller than the equivalent amount of the second gas fuel supply amount. in case of, A comparison operation unit is provided for increasing and decreasing the control signal so as to reduce the gas fuel supplied to the combustor.
[0021]
According to a third aspect of the present invention, in the gas turbine equipment control apparatus according to the first aspect, the temperature control determination unit is configured to Based on governor opening signal A first input unit that inputs a corresponding amount of the first gas fuel supply amount and converts it to a corresponding amount of the corresponding gas turbine inlet temperature by a predetermined function, and a predetermined function that inputs a gas turbine inlet temperature signal The second input part for converting the gas turbine inlet temperature corresponding to a substantial amount of the first gas fuel supply amount to the gas turbine inlet temperature by comparing the gas turbine inlet temperature with a corresponding amount of the gas turbine inlet temperature. When the temperature is smaller than a corresponding amount of the gas turbine inlet temperature by a predetermined value, a control signal is output so as to increase the amount of waste heat to the waste heat recovery boiler, and the gas turbine inlet temperature is greater than the amount corresponding to the gas turbine inlet temperature. When the specified value is larger. And a comparison operation unit that outputs a control signal for increasing the gas turbine inlet temperature.
[0022]
According to a fourth aspect of the present invention, in the gas turbine equipment control apparatus according to the first aspect, the selection determining unit outputs a setting signal for setting the optimum temperature of the combustor in advance to determine the optimum control temperature range; An input unit that inputs a deviation signal between a gas turbine inlet temperature and a corresponding amount of gas turbine inlet temperature that converts gas fuel by a predetermined function from the temperature control determination unit, and converts the deviation signal into a temperature signal corresponding to the setting signal; When the temperature signal is compared with the set signal and the temperature signal is within the optimum control temperature range, the control signal is output so that the steam from the exhaust heat recovery boiler system is injected and the temperature signal is outside the optimum control temperature range. In some cases, a comparison operation unit is provided that outputs a control signal so that the steam of the waste heat recovery boiler is injected.
[0023]
[Action]
According to the first aspect of the present invention, when the electric power load increases rapidly and the amount of surplus carbon dioxide gas increases, the compressed air and the gas fuel are controlled so that the gas surplus carbon dioxide gas is suppressed and controlled by the gas fuel supply determination unit. Is supplied to the combustor. Thereby, it is avoided that a large amount of atmospheric excess carbon dioxide gas is released to the atmosphere, and environmental destruction is prevented. When the turbine inlet temperature is sufficient, steam accumulates in the waste heat recovery boiler, and when the internal temperature of the combustor rises rapidly due to a sudden increase in power load, the waste heat recovery boiler steam is used in addition to the exhaust heat recovery boiler steam. Use. Therefore, it is possible to cope with a rapid increase in electric power load without using the steam of the in-house manufacturing equipment as much as possible, and the energy can be effectively used. In addition, fine control using exhaust heat recovery boiler, waste heat recovery boiler, or steam from the steam line system is performed based on gas fuel, gas turbine temperature and preset setting signal for sudden increase in power load. The Therefore, the temperature of the combustor does not rise or fall rapidly, and the life of the internal components of the combustor can be greatly extended.
[0024]
According to the invention of claim 2, when the electric power load increases rapidly and the amount of surplus carbon dioxide gas increases, the compressed air and the gas fuel are controlled so that the gas surplus carbon dioxide gas is suppressed and controlled by the gas fuel supply determination unit. Is supplied to the combustor. Thereby, it is avoided that a large amount of atmospheric excess carbon dioxide gas is released to the atmosphere, and environmental destruction is prevented.
[0025]
According to the invention of claim 3, when the turbine inlet temperature has a margin, steam is accumulated in the waste heat recovery boiler, and when the internal temperature of the combustor rises rapidly due to a sudden increase in power load, in addition to the steam of the exhaust heat recovery boiler Use steam from waste heat recovery boiler. Therefore, it is possible to cope with a rapid increase in electric power load without using the steam of the in-house manufacturing equipment as much as possible, and the energy can be effectively used.
[0026]
According to the invention of claim 4, the exhaust heat recovery boiler or the waste heat recovery boiler based on the gas fuel, the gas turbine temperature, and the preset setting signal that are input in advance with respect to the sudden increase in the power load, Fine control is performed using steam from the steam line system. Therefore, the temperature of the combustor does not rise or fall rapidly, and the life of the internal components of the combustor can be greatly extended.
[0027]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0028]
FIG. 1 shows a system diagram of a gas turbine facility showing an embodiment of the present invention, and the same reference numerals as those in FIG. 6 showing a conventional example show the same or corresponding parts.
[0029]
In FIG. 1, the main points different from FIG. 6 are that the waste heat steam system 30 from the exhaust heat recovery boiler 6 to the steam turbine generator 7 is supplied to a makeup water heating tank 31, a heating water supply valve 32, a waste heat recovery boiler 33, and a main heat. A steam control valve 34 is arranged, and an atmosphere surplus gas discharge part 36 is connected to the makeup water heating tank 31 via a surplus gas atmosphere release valve 35.
[0030]
The difference between the two figures is that an air discharge system 38 is additionally provided in a conduit 37 connecting the air compressor 2 and the combustor 3, and an air discharge control valve 39 is disposed in the air discharge system 38. It is.
[0031]
The gas turbine equipment described above is controlled by a control device 50 described later.
[0032]
The control device 50 is configured as shown in FIG. 2, and includes a signal input unit 51, a gas fuel supply determination unit 52, a temperature determination unit 53, and a selection determination unit 54.
[0033]
First, the signal input unit 51 inputs the governor opening signal K and outputs a signal S.
[0034]
As shown in FIG. 3, the gas fuel supply determination unit 52 includes a signal conversion unit 52a, a signal input unit 52b, a comparison calculation unit 52c, and output units 52d, 52e, and 52f, and the signal S of the signal input unit 51 is an output unit. The gas fuel is controlled via the gas turbine control hydraulic pressure command unit 55h and the gas turbine control hydraulic pressure control device 9, and the signal S is output to the output unit 52e and the governor motor operation command output unit 55g. The speed governor 5 is controlled via the control signal, and a signal S is output to the output unit 52f. The temperature control of the combustor 3 is controlled via the temperature control determination unit 53.
[0035]
In addition, the signal conversion unit 52a receives the signal S and converts it into a corresponding amount (A) of the corresponding first gas fuel supply amount by a predetermined function. The signal input unit 52b inputs the atmospheric discharge surplus carbon dioxide gas amount detection signal C and converts it into a corresponding amount (B) of the second gas fuel supply amount by a corresponding predetermined function.
[0036]
When the equivalent amount (A) of the first gas fuel supply amount has rapidly increased, the comparison calculation unit 52c has a corresponding amount (A) of the first gas fuel supply amount and an equivalent amount (B) of the second gas fuel supply amount. When (A) is greater than (B) (gas fuel supply amount> atmospheric carbon dioxide surplus gas amount), the gas fuel and the compressed air are increased through the output unit 52d and the output unit 52e, respectively. The signal XZ is output to the gas turbine control hydraulic pressure command unit 55h, and the signal Q is output to the governor motor operation command output unit 55g so as to increase.
[0037]
In addition, the comparison calculation unit 52c is configured such that when the equivalent amount (A) of the first gas fuel supply amount increases rapidly and (A) is smaller than (B) (gas fuel supply amount <exhaust carbon dioxide released to the atmosphere). Amount), a signal XZ in a decreasing direction is output to the gas turbine control hydraulic pressure command unit 55h via the output unit 52d so as to decrease the fuel to the combustor 3.
[0038]
In addition, even when the equivalent amount (A) of the first gas fuel supply amount changes suddenly, the comparison calculation unit 52c is substantially equivalent when (A) and (B) (gas fuel supply amount = atmospheric emission surplus carbon dioxide). Gas amount), gas turbine supply amount and atmospheric surplus carbon dioxide gas amount are in equilibrium, almost zero is output to the output unit 53f, and a signal S (gas fuel supply amount T) is output to the temperature determination unit 53.
[0039]
The temperature determination unit 53 is configured as shown in FIG. 4, and the input unit 53a converts the gas turbine inlet temperature to an equivalent amount F by a predetermined function corresponding to the gas fuel supply amount T. The input unit 53b A gas turbine inlet temperature signal T1 is input, and a gas turbine inlet temperature D corresponding to a substantial amount F of the gas turbine inlet temperature is output.
[0040]
The comparison operation unit 53c outputs a deviation signal between the signal F and the signal D to the output units 53d, 53e, and 53f. In addition, the comparison operation unit 53c compares the signal F and the signal D, and the signal D is higher than the signal F ( 1) In this case, a command signal U is output to the air discharge control command unit 55f via the output unit 53f so as to increase the gas turbine inlet temperature.
[0041]
Further, the comparison operation unit 53c outputs the deviation signal V from the output unit 53d to the selection determination unit 54 as being within the optimum set value when the deviation between the signal D and the signal F is within a predetermined value (2). When the signal F is larger than the signal D by a predetermined value or more (3), the comparison calculation unit 53c outputs the signal U1 to the command unit 55a such as a waste heat recovery boiler via the output unit 53e.
[0042]
As shown in FIG. 5, the selection determination unit 54 includes an input unit 54a, a setting unit 54b, and a comparison calculation unit 54c.
[0043]
The input unit 54a receives a deviation signal V between the signal D and the signal F from the temperature determination unit 53 and converts it into a signal H that can be compared with the setting signal G from the setting unit 54b.
[0044]
The setting unit 54b presets the temperature in the combustor 3 and outputs a signal G. The comparison calculation unit 54c sets the optimum control temperature range with the setting signal G as the center, and outputs the signal XY to the atmospheric discharge valve opening output unit 55e via the output unit 54d when the signal H is in the region shown in FIG. In addition, the signal X is output to the first valve opening output unit 55d.
[0045]
Further, when the deviation between the setting signal G and the signal H is small and within the range shown in FIG. 5B, the comparison calculation unit 54c outputs the signal A1 to the main steam control valve opening output unit 55b via the output unit 54d. , The signal W is output to the third valve opening degree output unit 55c.
[0046]
With the above configuration, as shown in FIG. 2, the governor opening degree signal K from the governor 5 is input to the signal input unit 51 and the signal S is provided in the control device 50 as shown in FIG. 52 is input. The input signal S is converted into a gas fuel supply amount according to a function set in advance by the signal conversion unit 52a of the gas fuel supply determination unit 52, and this is compared and calculated as an equivalent amount (A) of the first gas fuel supply amount. Is output to the unit 52c. The signal S is input to each of the output units 52d, 52e, and 52f, and the signal S and the signal input from the comparison operation unit 52c are calculated. For example, the signal S and the signal from the comparison operation unit 52c are added / subtracted.
[0047]
On the other hand, as shown in FIG. 3, an atmospheric discharge surplus carbon dioxide gas detection signal C is input to the signal input unit 52b of the gas fuel supply determination unit 52 and converted into a gas fuel supply amount according to a preset function. 2 is output to the comparison calculation unit 52c as the equivalent amount (B) of the gas fuel supply amount.
[0048]
When the equivalent amount of the first gas fuel supply amount suddenly increases, the comparison calculation unit 52c compares the equivalent amount (A) of the first gas fuel supply amount with the equivalent amount (B) of the second gas fuel supply amount. The When (A) is larger than (B) by this comparison (gaseous fuel supply amount> surplus carbon dioxide emission amount), in addition to the normal signal S, a deviation signal is input and calculated to increase gas fuel and compressed air. Thus, a signal Q is output to the governor motor operation command output unit 55g via the output unit 52e, and in addition, a signal is output to the gas turbine control hydraulic pressure command unit 55h via the output unit 52d.
[0049]
That is, when the power load increases rapidly, the amount of surplus carbon dioxide released to the atmosphere is small by comparing the amount of gas fuel supplied and the amount of surplus carbon dioxide released to the atmosphere. Therefore, in addition to the normal signal S, a signal for increasing gas fuel and compressed air is output. As a result, the output of the combustor 3 is increased and the output of the gas turbine 4 is increased.
[0050]
Further, when the power load is suddenly increased, when the equivalent amount (A) of the first gas fuel supply amount is smaller than the equivalent amount (B) of the second gas fuel supply amount by the comparison operation unit 52c (gas fuel supply amount < The signal XZ is output to the gas turbine control hydraulic pressure command unit 55h via the output unit 52d so that the fuel is reduced and supplied to the combustor 3 with respect to the normal signal S.
[0051]
That is, in this case, a large amount of excess carbon dioxide released into the atmosphere is released. Therefore, the gas fuel from the gas turbine control hydraulic pressure command unit 55h is decreased to shift from incomplete combustion to complete combustion. As a result, the surplus carbon dioxide gas released from the surplus air gas discharge unit 36 gradually decreases.
[0052]
As a result, even when the power load suddenly increases, the equivalent amount (A) of the first gas fuel supply amount and the equivalent amount (C) of the second gas fuel supply amount are almost equally balanced. In this case, since the deviation signal from the comparison calculation unit 52c is almost zero, only the normal signal S is output from the output units 52d, 52e, and 52f to the gas turbine control hydraulic pressure command unit 55h and the governor motor operation command output unit. 55 g is output to the temperature control determination unit 53.
[0053]
Here, for example, when a large machine or a large rolling mill in the factory operates, the power load increases rapidly. Along with this, the governor opening signal K rapidly increases. First, the normal signal S correspondingly increases and is output to the output units 52d, 52e, and 52f, and the signals XZ and Q rapidly increase. In addition, when the equivalent amount (A) of the first gas fuel supply amount is larger than the equivalent amount (B) of the second gas fuel supply amount, the gas fuel and the compressed air are increased so as to increase the power load. Will be increased.
[0054]
As a result, the generated power follows the sudden increase in power load. Thereafter, for example, when the large rolling mill is stopped and the power load is suddenly reduced, both the signal XZ and the signal Q are suddenly reduced by the normal calculation signal S.
[0055]
Further, when the power load is suddenly increased, if the equivalent amount (A) of the first gas fuel supply amount is smaller than the equivalent amount (B) of the second gas fuel supply amount, the signal XZ is decreased in addition to the signal S. A signal is output. As a result, the gas fuel can be reduced, and the release of excess carbon dioxide released into the atmosphere can be reduced, so that the substantial amount (A) of the first gaseous fuel supply amount gradually becomes the substantial amount of the second gaseous fuel supply amount ( B) is followed.
[0056]
Next, the gas fuel supply amount T is input to the temperature control determination unit 53 shown in FIG. 4 and converted into an equivalent amount F of the gas turbine inlet temperature according to a function set in advance by the input unit 53a. Further, a signal D obtained by converting the gas turbine inlet temperature signal T1 by the input unit 53b is output.
[0057]
In the comparison calculation unit 53c, a deviation signal V between the signal D and the signal F is output to the selection determination unit 54 via the output unit 53d.
[0058]
Further, in the comparison operation unit 53c, as shown in FIG. 4, the signal F and the signal D are compared, and when the signal F is lower (1) than the signal D, to the air discharge control command unit 55f via the output unit 53f. A signal for closing the air discharge control valve 39 is output. As a result, the air discharge control valve 39 is closed and the turbine inlet temperature is raised.
[0059]
Further, when the signal F is larger than the signal D by a predetermined value (3) by the comparison by the comparison calculation unit 53c, the signal U1 is output to the command unit 55a such as a waste heat recovery boiler via the output unit 53e. Thereby, the heating water supply valve 32 is opened more and the heated water is supplied from the makeup water heating tank 31 to the waste heat recovery boiler 33.
[0060]
Next, in the selection determination unit 54 to which the deviation signal V between the signal D and the signal F is input, the signal is converted into the signal H by the input unit 54a. Then, the optimum control temperature range is set by the comparison calculation unit 54c corresponding to the signal G from the setting unit 54b.
[0061]
Here, when the signal H is within the optimum control temperature range (state B), the signal A1 is output to the main steam control valve opening output unit 55b via the output unit 54d, and the signal W is the third valve opening output. Is output to the unit 55c.
[0062]
Further, when the signal H is larger than the optimum control temperature range (A), in addition to the signal W for opening the third valve 18, the signal XY is output to the atmospheric discharge valve opening output unit 55e via the output unit 54d. The signal X is output to the first valve opening output unit 55d.
[0063]
As a result, when the temperature of the combustor 3 is optimum, the control by the third valve 18 is performed, and when the temperature of the combustor 3 is high, the first valve 14 and the surplus gas atmospheric discharge valve 35 are controlled in the opening direction. The
[0064]
For example, as described above, when the large-scale rolling mill operates and the power demand increases rapidly, the considerable amount (A) of the first gas fuel supply amount described in FIG. 3 increases rapidly. At this time, the gas fuel supply amount T shown in FIG. 4 corresponding to the equivalent amount (A) of the first gas fuel supply amount rapidly increases and is input to the temperature control determination unit 53. In the temperature control determination unit 53, the heated water supply valve 32 is opened and closed from the waste heat recovery boiler command unit 55 a and the heated water is accumulated in the waste heat recovery boiler 33.
[0065]
Further, the deviation signal from the temperature control determination unit 53 increases rapidly and is input to the selection determination unit 54. When the temperature of the combustor 3 rapidly rises in this state, the first valve 14 and the surplus gas atmospheric discharge valve 35 are rapidly opened to prevent a sudden temperature rise of the combustor 3.
[0066]
When the large rolling mill stops, the substantial amount (A) of the first gas fuel supply amount drops rapidly. Thereby, in the selection judgment part 54, the deviation signal from the temperature control judgment part 53 decreases rapidly, and the 1st valve 14 and the surplus gas atmospheric release valve 35 are made into the rapid closing direction, and a rapid temperature fall is prevented.
[0067]
As described above, first, when the power load increases rapidly, gas fuel is supplied so that the excess carbon dioxide released to the atmosphere is not released, thereby preventing environmental destruction.
[0068]
Second, because the power load has increased rapidly, surplus energy can be stored in the waste heat recovery boiler as steam. And when electric power load increases rapidly, the temperature rise in a combustor can be prevented without using steam for in-house manufacturing equipment as much as possible, and energy can be used effectively.
[0069]
Thirdly, the temperature control determination unit 53 and the selection determination unit 54 are configured to suppress the temperature increase of the combustor 3 in response to the rapid increase of the gas fuel before the turbine inlet temperature increases when the power load increases rapidly. And work. Therefore, since the rapid change in internal temperature of the combustor can be suppressed, the life of the internal components can be extended significantly.
[0070]
【The invention's effect】
As described above, according to the invention of claim 1, when the power load increases rapidly and the amount of surplus carbon dioxide gas increases, it is avoided that a large amount of atmospheric surplus carbon dioxide gas is released to the atmosphere, Environmental destruction can be prevented. When the turbine inlet temperature is sufficient, steam is accumulated in the waste heat recovery boiler, and when the internal temperature of the combustor rises rapidly due to a sudden increase in power load, in addition to the exhaust heat recovery boiler steam, the waste heat recovery boiler steam is Since this is used, it is possible to cope with a sudden increase in electric power load without using steam in the in-house production facility, and effective use of energy is achieved. In addition, exhaust heat recovery boiler, waste heat recovery boiler, or steam from the steam line system is used based on gas fuel, gas turbine temperature, and preset setting signal that are input in advance for sudden increase in power load. Since the control is finely performed, the temperature of the combustor does not rise or fall rapidly, and the life of the internal components of the combustor can be greatly extended.
[0071]
According to the invention of claim 2, when the electric power load increases rapidly and the amount of surplus carbon dioxide gas increases, the compressed air and the gas fuel are controlled so that the gas surplus carbon dioxide gas is suppressed and controlled by the gas fuel supply determination unit. Is supplied to the combustor. Thereby, it is possible to avoid a large amount of excess carbon dioxide from being released into the atmosphere and prevent environmental destruction.
[0072]
According to the invention of claim 3, when the turbine inlet temperature has a margin, steam is accumulated in the waste heat recovery boiler, and when the internal temperature of the combustor suddenly rises due to a sudden increase in power load, the steam of the exhaust heat recovery boiler In addition, steam from a waste heat recovery boiler is used. Therefore, it is possible to cope with a rapid increase in electric power load without using the steam of the in-house manufacturing equipment as much as possible, and the energy can be effectively used.
[0073]
According to the invention of claim 4, the exhaust heat recovery boiler or the waste heat recovery boiler based on the gas fuel, the gas turbine temperature, and the preset setting signal that are input in advance in response to the sudden increase in power load. Alternatively, fine control is performed using the steam of the steam line system. Therefore, the temperature of the combustor does not rise or fall rapidly, and the life of the internal components of the combustor can be greatly extended.
[Brief description of the drawings]
FIG. 1 is a system diagram of gas turbine equipment showing an embodiment of the present invention.
FIG. 2 is a configuration diagram of a control device provided in the gas turbine facility of FIG. 1;
3 is a configuration diagram illustrating a gas fuel supply determination unit in FIG. 2;
4 is a configuration diagram illustrating a temperature control determination unit in FIG. 2;
FIG. 5 is a configuration diagram illustrating a selection determination unit in FIG. 2;
FIG. 6 is a system diagram of gas turbine equipment showing a conventional example.
[Explanation of symbols]
2 Air compressor
3 Combustors
4 Gas turbine
5 governor
6 Waste heat recovery boiler
9 Gas turbine control hydraulic control device
13 Fuel control valve
14 First valve
15 Second valve
18 3rd valve
20 On-site manufacturing facilities
33 Waste heat recovery boiler
36 Excess gas release part
50 Control device
51 Signal input section
52 Gas Fuel Supply Judgment Unit
52a Signal converter
52b Signal input section
52c, 53c, 54c comparison operation unit
52d, 52e, 52f, 53d, 53e, 53f, 54d Output unit
53 Temperature Control Judgment Unit
53a, 53b, 54a Input section
54 Selection Judgment Unit
54b Setting part
55a Command section for waste heat recovery boiler, etc.
55b Main steam control valve opening output section
55c First valve opening output section
55d Second valve opening output section
55e Air release valve opening output section
55f Air discharge control command section
55g governor motor operation command output section
55h Gas turbine control oil pressure command section

Claims (4)

A gas turbine system that generates high-temperature gas in a combustor using compressed air and gas fuel by an air compressor, injects the high-temperature gas into a gas turbine, and drives the gas turbine to generate power. The exhaust heat recovery boiler system that sends the exhausted high-temperature exhaust gas to the exhaust heat recovery boiler to generate steam, and the surplus gas from this exhaust heat recovery boiler system is sent to the makeup water heating tank to heat the makeup water in the makeup water heating tank Then, the heated water is sent to the waste exhaust heat recovery boiler to generate steam, and the waste heat recovery boiler system having the surplus gas discharge part that discharges surplus exhaust gas to the atmosphere, and the steam line system that supplies steam to the on-site equipment In a control device for controlling gas turbine equipment comprising:
While outputting a control signal for controlling the compressed air and gas fuel supplied to the combustor in response to increase / decrease in the governor opening signal due to increase / decrease in the power generation load of the gas turbine system , A gas fuel supply determination unit that increases or decreases the compressed air and the gas fuel by increasing or decreasing the control signal so as to suppress the discharge of the atmospheric excess carbon dioxide gas discharged from the atmospheric surplus gas discharge unit;
A temperature control determination unit that controls to supply waste heat to the waste heat recovery boiler system based on the inlet temperature of the gas turbine and the gas fuel when there is a margin in the inlet temperature of the gas turbine;
Each steam of the exhaust heat recovery boiler system, the waste heat recovery boiler system or the steam line system is selected and injected based on the inlet temperature of the gas turbine, the gas fuel, and a preset gas turbine temperature. And a selection determining unit for setting the inside of the combustor to an optimum temperature. The gas fuel supply determination unit outputs a control signal for controlling the compressed air and the gas fuel in response to increase / decrease in the governor opening signal due to increase / decrease in the power generation load of the gas turbine system, while the governor A signal converter that inputs an opening signal and converts it into a corresponding amount of the corresponding first gas fuel supply amount by a predetermined function;
A signal input unit that inputs an atmospheric discharge surplus carbon dioxide gas amount detection signal and converts it into a corresponding amount of the corresponding second gas fuel supply amount by a predetermined function;
When power load surge, the first a considerable amount of gas fuel supply amount by comparing the significant amount of the second gas fuel supply amount, a substantial amount of the first gas fuel supply amount is the second in the case of larger substantial amount of gas fuel supply amount, the gas fuel by increasing or decreasing the control signal to increase the output, the first gas fuel supply amount of the substantial amount of the second gas fuel The gas turbine according to claim 1, further comprising a comparison operation unit that outputs the control signal by increasing / decreasing the amount of gas fuel supplied to the combustor when the supply amount is smaller than a substantial amount. Equipment control device. The temperature control determination unit inputs a first amount corresponding to the first gas fuel supply amount based on the governor opening signal, and converts the first gas fuel supply amount into a corresponding amount corresponding to the gas turbine inlet temperature using a predetermined function. And
A second input for inputting a gas turbine inlet temperature signal and converting it into a gas turbine inlet temperature corresponding to a substantial amount of the first gas fuel supply amount by a predetermined function;
When the gas turbine inlet temperature is smaller than the equivalent amount of the gas turbine inlet temperature by comparing the gas turbine inlet temperature and the equivalent amount of the gas turbine inlet temperature, the amount of waste heat to the waste heat recovery boiler is increased. When the gas turbine inlet temperature is higher than the corresponding amount of the gas turbine inlet temperature by a predetermined value. The control device for gas turbine equipment according to claim 1, further comprising a comparison operation unit that outputs a control signal for increasing the gas turbine inlet temperature. The selection determining unit outputs a setting signal for setting an optimal temperature of the combustor in advance to determine an optimal control temperature range; and
An input for converting the gas fuel into a temperature signal corresponding to the setting signal by inputting a deviation signal between the gas turbine inlet temperature corresponding to the gas fuel converted by a predetermined function and the gas turbine inlet temperature from the temperature control determination unit. And
The temperature signal and the setting signal are compared, and when the temperature signal is within the optimum control temperature range, a control signal is output so as to be injected using steam of the exhaust heat recovery boiler system, and the temperature signal is 2. The control device for a gas turbine equipment according to claim 1, further comprising a comparison calculation unit that outputs a control signal so that the steam of the waste heat recovery boiler is injected when the temperature is outside the most idle control temperature range.

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