EP2185868A1 - Device and method for regulating the exhaust temperature of a gas turbine - Google Patents

Device and method for regulating the exhaust temperature of a gas turbine

Info

Publication number
EP2185868A1
EP2185868A1 EP07827626A EP07827626A EP2185868A1 EP 2185868 A1 EP2185868 A1 EP 2185868A1 EP 07827626 A EP07827626 A EP 07827626A EP 07827626 A EP07827626 A EP 07827626A EP 2185868 A1 EP2185868 A1 EP 2185868A1
Authority
EP
European Patent Office
Prior art keywords
igv
plant
basis
controlling
reference values
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07827626A
Other languages
German (de)
French (fr)
Inventor
Luca Buzzoni
Paolo Pesce
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ansaldo Energia SpA
Original Assignee
Ansaldo Energia SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ansaldo Energia SpA filed Critical Ansaldo Energia SpA
Publication of EP2185868A1 publication Critical patent/EP2185868A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/02—Continuous combustion chambers using liquid or gaseous fuel characterised by the air-flow or gas-flow configuration
    • F23R3/26—Controlling the air flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
    • F02C9/26—Control of fuel supply
    • F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
    • F02C9/48—Control of fuel supply conjointly with another control of the plant
    • F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
    • F02C9/54—Control of fuel supply conjointly with another control of the plant with control of working fluid flow by throttling the working fluid, by adjusting vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/08—Purpose of the control system to produce clean exhaust gases
    • F05D2270/083—Purpose of the control system to produce clean exhaust gases by monitoring combustion conditions
    • F05D2270/0831—Purpose of the control system to produce clean exhaust gases by monitoring combustion conditions indirectly, at the exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/303—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/309—Rate of change of parameters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/70—Type of control algorithm
    • F05D2270/708—Type of control algorithm with comparison tables
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/20—Gas turbines

Definitions

  • the present invention relates to a gas turbine plant control device and method.
  • Figure 1 shows a block diagram of a gas turbine plant comprising the control device according to the present invention
  • FIG. 2 shows a block diagram of the control device according to the present invention
  • Figure 3 shows a graph of a control function of the Figure 2 control device
  • Figure 4 shows a graph of the exhaust temperature of the Figure 1 gas turbine in relation to power output percentage .
  • FIG. 1 indicates a gas turbine electric power plant.
  • Plant 1 substantially comprises a turbine assembly 3 ; a generator 4 which converts the mechanical power produced by turbine assembly 3 to active electric power - hereinafter referred to simply as power output P; a control device 5; a pickup module 6; and an actuator 7.
  • Turbine assembly 3 comprises a compressor 9, a combustion chamber 10, and a gas turbine 11. More specifically, compressor 9 comprises a variable-geometry inlet stage 14, in turn comprising an array of adjustable vanes or so-called IGVs (Inlet Guide Vanes) (not shown for the sake of simplicity) which can be tilt-adjusted by actuator 7 to regulate air intake by compressor 9.
  • IGVs Inlet Guide Vanes
  • Pickup module 6 comprises a number of sensors (not shown for the sake of simplicity) for detecting a number of plant 1 parameters, which are then supplied to control device 5. More specifically, pickup module 6 detects the exhaust gas temperature or so-called exhaust temperature T 3 of turbine 11; electric power output P or so-called load; the position IGV PO s of the adjustable vanes of inlet stage 14 of compressor 9; and fuel flow
  • Control device 5 substantially comprises a first control module 18 for controlling exhaust temperature T 3 ; a reference value selection module 19 which supplies first control module 18 with exhaust temperature reference values T SRIF ; and a second control module 20 which operates during fuel transients, i.e. variations in fuei flow Q F , to supply first control module 18 with a control signal U c .
  • reference value section module 19 comprises a fixed reference module 22, a variable reference module 23, and a selector module 24.
  • Fixed reference module 22 supplies a constant exhaust temperature reference value T SRIFC / usually defined beforehand, which does not vary alongside variations in the other parameters of plant 1, and which preferably can only be modified by a trained technician.
  • Variable reference module 23 receives the position IGVp 0S of the adjustable vanes of compressor 9, and supplies a variable exhaust temperature reference value TsRiFv which varies as a function of the position IGV PO s of the adjustable vanes, and therefore indirectly as a function of power output P of plant 1.
  • variable reference module 23 comprises a first computing module 25 and a second computing module 26.
  • First computing module 25 receives a position IGV PO s of the adjustable vanes, and supplies an exhaust temperature reference value T S RIF VO calculated on the basis of a function F(IGV PO s) defined beforehand and which varies according to the type of plant. For each position IGV PO s of the adjustable IGVs, first computing module 25 supplies a reference value T SRIFV o, T S RIFVI» T S RIFV2
  • function F(IGV PO s) varies according to the type of burner used in gas turbine plant 1.
  • number 50 in Figure 3 shows a function F(IGV PO s) of a plant equipped with an ecological burner, e.g. of the type described in Patent Application EP 1710502 filed by Ansaldo Energia S.p.A..
  • Number 51 indicates a function F(IGV PO s) of a plant equipped with a conventional burner.
  • First computing module 25 preferably contains a function F(IGV PO s) library covering most currently marketed gas turbine plant burners .
  • Second computing module 26 receives and memorizes the reference value T SRIFVI calculated by first computing module 25, and supplies a reference value T SRIFV , which has a ramp time pattern between the last memorized reference value T S RIF VO and the received reference value TsRiFvi/ to avoid sudden changes in reference value T SRIFV , and to slow down the variation in reference value T SR I FV with respect to the variation in the position of the IGVs.
  • the constant reference value T SRIFC and variable reference value T SR i FV are supplied to selector module 24, which, on the basis of predetermined, preferably operator-entered settings, selects from constant and variable reference values T S RIFC and T S RIFV a reference value T 3R i F for supply to first control module 18.
  • First control module 18 receives a measured exhaust temperature value T 3 from pickup module 6, and a reference value T 3RIF from reference value selection module 19, and supplies actuator 7 with a drive signal Ui G v to adjust the position of the IGVs of compressor 9. More specifically, first control module 18 comprises an error computing module 27, which calculates a temperature error e ⁇ , i.e.
  • drive module 28 which transmits drive signal U IGV to actuator 7 on the basis of temperature error e ⁇ .
  • drive module 28 generates drive signal U IGV using PID (proportional-integral-derivative) control logic.
  • Second control module 20 receives plant 1 power output value P and fuel flow value Q F from pickup module 6, and, during fuel transients, supplies first control module 18 - in particular, drive module 28 - with a control signal U c , correlated with the power gradient ⁇ P/ ⁇ t, to modify drive signal U IGV -
  • second control module 20 comprises a computing module 29, a library module 30, and an analysis module 31.
  • Computing module 29 receives and memorizes power output value P, and calculates its gradient ⁇ P/ ⁇ t for supply to analysis module 31, and also receives and memorizes fuel flow value Q F , and calculates the variation in fuel flow ⁇ Q F for supply to analysis module 31.
  • Library module 30 comprises a number of control signal U c curves for different variations in fuel flow ⁇ Q F , and each of which corresponds to a respective power gradient value ⁇ P/ ⁇ t. In the event of a variation in fuel flow ⁇ Q F
  • analysis module 31 selects a given control signal U c from library module 30 on the basis of power gradient value ⁇ P/ ⁇ t and fuel flow variation value ⁇ Q F , and supplies it to first control module 18.
  • control signal U c supplied to drive module 28 substantially overrides control of actuator 7 based on temperature error e ⁇ . That is, control signal U c from second control module 20 acts on drive module 28 so that drive signal U IGV produces a variation in the position of the IGVs based mainly on power gradient value ⁇ P/ ⁇ t and the variation in fuel flow Q F .
  • control device 5 is able to respond to given variations in power P and fuel flow Q F , before these variations affect exhaust temperature T 3 , and therefore to make a prompt adjustment to the position of the IGVs. Operation of control device 5 as described above produces an exhaust temperature T 3 pattern, as a function of the power output P percentage of rated power P N , as shown in Figure 4.
  • Figure 4 shows a first exhaust temperature T 3 curve 40, as controlled by control device 5 when selector 24 is set to select a constant exhaust temperature reference value T SRIF c- Curve 40 increases steadily up to exhaust temperature reference value TsRiFC/ at which point, adjustment of the position of the IGVs by control device 5 produces a constant exhaust temperature T 3 until the IGVs are fully opened.
  • Curves 41 and 42 show exhaust temperature T 3 as controlled by control device 5 when selector 24 is set to select a variable exhaust temperature reference value T SRIFV .
  • curve 41 shows exhaust temperature T 3 of a plant equipped with an ecological burner, which safely permits high temperatures within the maximum permitted NO x emission level.
  • first computing module 25 of variable reference module 23 is based on a function F(IGV P03 ) ( Figure 3) designed for plants with ecological burners, i.e. capable of sustaining higher exhaust temperatures.
  • the exhaust temperature T 3 curve 41 produced by control device 5 is therefore characterized by higher temperatures than the constant reference value curve
  • Curve 40 especially at low percentage power P values (around 40%) .
  • control device 5 the efficiency of plant 1 is therefore improved, especially at low power P values, the advantages of which are obvious, particularly during nighttime operation of plant 1, i.e. when the plant runs at minimum power P.
  • Curve 42 shows exhaust temperature T 3 of a plant equipped with a conventional burner, which allows no increase in exhaust temperature T 3 , by resulting in unacceptable NO x emission levels.
  • first computing module 25 of variable reference module 23 is therefore based on a function F(IGV P03 ) designed for plants with conventional burners, to produce an exhaust temperature T 3 curve (42) characterized by lower temperatures than the constant reference value curve (curve 40) at low power output P values (around 40%) .
  • Reducing exhaust temperature T 3 greatly reduces NO x emissions, which is particularly important when operating at minimum environmental load.
  • minimum power P i.e. at minimum environmental load
  • a large amount of highly pollutant gas must be supplied to keep the flame of burner 10 alive, so that NO x emissions are normally substantially high.
  • control device 5 it is therefore possible to lower exhaust temperature T 8 and, hence, NO x emissions at the minimum environmental load.
  • Control device 5 also provides for lowering the minimum environmental load value. That is, by lowering exhaust temperature T 3 , gas supply to keep the flame of burner 10 alive can be increased and the minimum environmental load value therefore reduced.
  • Figure 4 shows two curves 41 and 42 of exhaust temperature T 3 as controlled by control device 5 when selector 24 is set to select a variable exhaust temperature reference value T SRIFV - Depending on the set function F(IGV PO s) of first computing module 25 of variable reference module 23, however, a number of different exhaust temperature T 3 curves may be obtained as required.
  • selector 24 is set to select a variable exhaust temperature reference value T SRIFV -
  • F(IGV PO s) of first computing module 25 of variable reference module 23 a number of different exhaust temperature T 3 curves may be obtained as required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

A gas turbine plant control device has control means for selectively controlling an exhaust gas temperature (TS) of the turbine (11) on the basis of at least two distinct reference values (TSRIFV0, TSRIFVI, TSRIFV2... TSRIFVn) related to a power output value (P) of the plant (1).

Description

DEVICE AND METHOD FOR REGULATING THE EXHAUST TEMPERATURE OF A GAS TURBINE
TECHNICAL FIELD
The present invention relates to a gas turbine plant control device and method. BACKGROUND ART
In recent years, increasing demand for improved performance of gas turbine power plants , and increasingly strict regulations governing pollutant fume emissions (e.g. NOx, CO) , have led to research into control systems designed to improve plant performance while at the same time maintaining low pollutant fume emission levels .
In particular, there is increasing market demand for improved low-load plant efficiency, i.e. when the plant is running at below-rated power output level. Particular importance is attached to plant efficiency at minimum environmental load, and to reducing the minimum environmental load. Nighttime energy rates are in fact much lower than daytime rates, so electric power plants tend to operate at the minimum permitted power level - that is referred to as minimum environmental load - to save fuel. Improving plant efficiency at minimum environmental load and, above all, reducing the minimum regulation load, would have enormous economic advantages, by enabling the plant, for example, to produce more power with no increase in cost, by simply improving the low-load efficiency of the plant. DISCLOSURE OF INVENTION
It is an object of the present invention to provide a gas turbine plant control device which is compatible with both plants comprising new-generation ecological burners, e.g. of the type described in Patent Application EP 1710502 filed by Ansaldo Energia S.p.A., and plants comprising conventional burners, and which is designed to maintain low pollutant fume emission levels, while at the same time ensuring high performance at low loads and, in particular, at minimum environmental load. According to the present invention, there are provided a control device and method as claimed in Claims 1 and 9 respectively.
BRIEF DESCRIPTION OF THE DRAWINGS
A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which: Figure 1 shows a block diagram of a gas turbine plant comprising the control device according to the present invention;
Figure 2 shows a block diagram of the control device according to the present invention;
Figure 3 shows a graph of a control function of the Figure 2 control device;
Figure 4 shows a graph of the exhaust temperature of the Figure 1 gas turbine in relation to power output percentage .
BEST MODE FOR CARRYING OUT THE INVENTION Number 1 in Figure 1 indicates a gas turbine electric power plant. Plant 1 substantially comprises a turbine assembly 3 ; a generator 4 which converts the mechanical power produced by turbine assembly 3 to active electric power - hereinafter referred to simply as power output P; a control device 5; a pickup module 6; and an actuator 7. Turbine assembly 3 comprises a compressor 9, a combustion chamber 10, and a gas turbine 11. More specifically, compressor 9 comprises a variable-geometry inlet stage 14, in turn comprising an array of adjustable vanes or so-called IGVs (Inlet Guide Vanes) (not shown for the sake of simplicity) which can be tilt-adjusted by actuator 7 to regulate air intake by compressor 9.
Pickup module 6 comprises a number of sensors (not shown for the sake of simplicity) for detecting a number of plant 1 parameters, which are then supplied to control device 5. More specifically, pickup module 6 detects the exhaust gas temperature or so-called exhaust temperature T3 of turbine 11; electric power output P or so-called load; the position IGVPOs of the adjustable vanes of inlet stage 14 of compressor 9; and fuel flow
Control device 5 substantially comprises a first control module 18 for controlling exhaust temperature T3; a reference value selection module 19 which supplies first control module 18 with exhaust temperature reference values TSRIF; and a second control module 20 which operates during fuel transients, i.e. variations in fuei flow QF, to supply first control module 18 with a control signal Uc.
With reference to Figure 2, reference value section module 19 comprises a fixed reference module 22, a variable reference module 23, and a selector module 24. Fixed reference module 22 supplies a constant exhaust temperature reference value TSRIFC/ usually defined beforehand, which does not vary alongside variations in the other parameters of plant 1, and which preferably can only be modified by a trained technician. Variable reference module 23 receives the position IGVp0S of the adjustable vanes of compressor 9, and supplies a variable exhaust temperature reference value TsRiFv which varies as a function of the position IGVPOs of the adjustable vanes, and therefore indirectly as a function of power output P of plant 1.
More specifically, variable reference module 23 comprises a first computing module 25 and a second computing module 26. First computing module 25 receives a position IGVPOs of the adjustable vanes, and supplies an exhaust temperature reference value TSRIFVO calculated on the basis of a function F(IGVPOs) defined beforehand and which varies according to the type of plant. For each position IGVPOs of the adjustable IGVs, first computing module 25 supplies a reference value TSRIFVo, TSRIFVI» TSRIFV2
••• TsRlFVn •
More specifically, function F(IGVPOs) varies according to the type of burner used in gas turbine plant 1. For example, number 50 in Figure 3 shows a function F(IGVPOs) of a plant equipped with an ecological burner, e.g. of the type described in Patent Application EP 1710502 filed by Ansaldo Energia S.p.A.. Number 51 indicates a function F(IGVPOs) of a plant equipped with a conventional burner.
It is understood that functions F(IGVPOs) 51 and 52 shown are purely indicative, and may differ depending on the type of burner used. First computing module 25 preferably contains a function F(IGVPOs) library covering most currently marketed gas turbine plant burners .
Second computing module 26 receives and memorizes the reference value TSRIFVI calculated by first computing module 25, and supplies a reference value TSRIFV, which has a ramp time pattern between the last memorized reference value TSRIFVO and the received reference value TsRiFvi/ to avoid sudden changes in reference value TSRIFV, and to slow down the variation in reference value TSRIFV with respect to the variation in the position of the IGVs.
The constant reference value TSRIFC and variable reference value TSRiFV are supplied to selector module 24, which, on the basis of predetermined, preferably operator-entered settings, selects from constant and variable reference values TSRIFC and TSRIFV a reference value T3RiF for supply to first control module 18. First control module 18 receives a measured exhaust temperature value T3 from pickup module 6, and a reference value T3RIF from reference value selection module 19, and supplies actuator 7 with a drive signal UiGv to adjust the position of the IGVs of compressor 9. More specifically, first control module 18 comprises an error computing module 27, which calculates a temperature error eτ, i.e. the difference between measured exhaust temperature T3 and reference value T SRIF; and an IGV drive module 28, which transmits drive signal UIGV to actuator 7 on the basis of temperature error eτ. Preferably, drive module 28 generates drive signal UIGV using PID (proportional-integral-derivative) control logic.
Second control module 20 receives plant 1 power output value P and fuel flow value QF from pickup module 6, and, during fuel transients, supplies first control module 18 - in particular, drive module 28 - with a control signal Uc, correlated with the power gradient ΔP/Δt, to modify drive signal UIGV-
More specifically, second control module 20 comprises a computing module 29, a library module 30, and an analysis module 31. Computing module 29 receives and memorizes power output value P, and calculates its gradient ΔP/Δt for supply to analysis module 31, and also receives and memorizes fuel flow value QF, and calculates the variation in fuel flow ΔQF for supply to analysis module 31.
Library module 30 comprises a number of control signal Uc curves for different variations in fuel flow ΔQF, and each of which corresponds to a respective power gradient value ΔP/Δt. In the event of a variation in fuel flow ΔQF
(transient fuel condition) , analysis module 31 selects a given control signal Uc from library module 30 on the basis of power gradient value ΔP/Δt and fuel flow variation value ΔQF, and supplies it to first control module 18.
The control signal Uc supplied to drive module 28 substantially overrides control of actuator 7 based on temperature error eτ. That is, control signal Uc from second control module 20 acts on drive module 28 so that drive signal UIGV produces a variation in the position of the IGVs based mainly on power gradient value ΔP/Δt and the variation in fuel flow QF.
As a result, control device 5 is able to respond to given variations in power P and fuel flow QF, before these variations affect exhaust temperature T3, and therefore to make a prompt adjustment to the position of the IGVs. Operation of control device 5 as described above produces an exhaust temperature T3 pattern, as a function of the power output P percentage of rated power PN, as shown in Figure 4.
More specifically, Figure 4 shows a first exhaust temperature T3 curve 40, as controlled by control device 5 when selector 24 is set to select a constant exhaust temperature reference value TSRIFc- Curve 40 increases steadily up to exhaust temperature reference value TsRiFC/ at which point, adjustment of the position of the IGVs by control device 5 produces a constant exhaust temperature T3 until the IGVs are fully opened.
Curves 41 and 42, on the other hand, show exhaust temperature T3 as controlled by control device 5 when selector 24 is set to select a variable exhaust temperature reference value TSRIFV.
More specifically, curve 41 shows exhaust temperature T3 of a plant equipped with an ecological burner, which safely permits high temperatures within the maximum permitted NOx emission level. In plants of this type, first computing module 25 of variable reference module 23 is based on a function F(IGVP03) (Figure 3) designed for plants with ecological burners, i.e. capable of sustaining higher exhaust temperatures. The exhaust temperature T3 curve 41 produced by control device 5 is therefore characterized by higher temperatures than the constant reference value curve
(curve 40) , especially at low percentage power P values (around 40%) . By virtue of control device 5, the efficiency of plant 1 is therefore improved, especially at low power P values, the advantages of which are obvious, particularly during nighttime operation of plant 1, i.e. when the plant runs at minimum power P. Curve 42 shows exhaust temperature T3 of a plant equipped with a conventional burner, which allows no increase in exhaust temperature T3, by resulting in unacceptable NOx emission levels. In plants of this type, first computing module 25 of variable reference module 23 is therefore based on a function F(IGVP03) designed for plants with conventional burners, to produce an exhaust temperature T3 curve (42) characterized by lower temperatures than the constant reference value curve (curve 40) at low power output P values (around 40%) . Reducing exhaust temperature T3 greatly reduces NOx emissions, which is particularly important when operating at minimum environmental load. When the plant operates at minimum power P, i.e. at minimum environmental load, a large amount of highly pollutant gas must be supplied to keep the flame of burner 10 alive, so that NOx emissions are normally substantially high. By means of control device 5, it is therefore possible to lower exhaust temperature T8 and, hence, NOx emissions at the minimum environmental load.
Control device 5 also provides for lowering the minimum environmental load value. That is, by lowering exhaust temperature T3, gas supply to keep the flame of burner 10 alive can be increased and the minimum environmental load value therefore reduced.
Figure 4 shows two curves 41 and 42 of exhaust temperature T3 as controlled by control device 5 when selector 24 is set to select a variable exhaust temperature reference value TSRIFV- Depending on the set function F(IGVPOs) of first computing module 25 of variable reference module 23, however, a number of different exhaust temperature T3 curves may be obtained as required. Clearly, changes may be made to the device as described herein without, however, departing from the scope of the accompanying Claims.

Claims

I)- A gas turbine plant control device comprising control means for controlling an exhaust gas temperature (T5) of the turbine (11); the device (5) being characterized in that the control means are configured to selectively control the temperature (T3) on the basis of at least two distinct reference values (TSRIFVO/ TSRIFVI, TSRIFV2 - T3RiFVn) related to a power output value (P) of the plant (1) .
2) A device as claimed in Claim 1, characterized in that the reference values (TSRIFVo, TSRIFVi, TSRIFV2 - T3RiFvn) are related to a position (IGVPOs) of adjustable vanes (IGV) of a compressor (9) of the gas turbine plant (1) . 3) A device as claimed in Claim 2, characterized in that the distinct reference values (TSRIFVo, TSRIFVI, TSRIFV2 - TSRIFVn) increase gradually.
4) A device as claimed in Claim 2, characterized in that the distinct reference values (TSRIFVO/ TSRIFVI, T3RIFV2 ... T3R1Fvn) decrease gradually.
5) A device as claimed in any one of Claims 1 to 4 , characterized in that the control means are configured to supply an actuator (7) with a drive signal (UIGV) for driving the adjustable vanes (IGV) . 6) A device as claimed in Claim 5, characterized in that the control means are configured to supply the drive signal (UIGV) on the basis of an error (eτ) in exhaust temperature (T3) . 7 ) A device as claimed in any one of the foregoing Claims, characterized by comprising second control means configured to supply, selectively in response to variations in fuel flow (QF) , a control signal (Uc) on the basis of fuel flow (QF) and power output (P) values of the plant (1) .
8) A device as claimed in Claim 7 dependent on Claim 6, characterized in that the control means are configured to supply the drive signal (UIGV) on the basis of the control signal (Uc) and selectively in response to variations in fuel flow (QF) .
9) A method of controlling a gas turbine plant, comprising the step of controlling an exhaust gas temperature (T3) of the turbine (11); the method being characterized in that the step of controlling the exhaust gas temperature (T3) comprises selectively controlling the temperature (T3) on the basis of at least two distinct reference values (TSRIFVO/ TSRIFVI/ TSRIFV2 - T3RiFVn) related to a power output value (P) of the plant (1) .
10) A method as claimed in Claim 9, characterized in that the reference values (TSR1FVo, TSRIFVI, TSRIFV2 - T3RiFVn) are related to a position (IGVPOs) of adjustable vanes (IGV) of a compressor (9) of the gas turbine plant (1).
11 ) A method as claimed in Claim 9 or 10 , characterized in that the distinct reference values ( TsRipvo , T3RiFVi , T3R1Fv2 ... T3RiFVn) increase gradual ly . 12) A method as claimed in Claim 9 or 10, characterized in that the distinct reference values (TsRiFvo, TSRIFvi, TSRIFV2 ... T3RIFVn) decrease gradually.
13) A method as claimed in any one of Claims 9 to 12, characterized in that the step of controlling an exhaust gas temperature (T3) of the turbine (11) comprises the step of supplying an actuator (7) with a drive signal (UIGV) for driving the adjustable vanes (IGV) . 14) A method as claimed in Claim 13, characterized in that the step of supplying the drive signal (UIGV) for driving the adjustable vanes (IGV) comprises calculating the drive signal (UIGv) on the basis of an error (eτ) in exhaust temperature (T3) . 15) A method as claimed in any one of Claims 9 to 14, characterized in that the step of controlling an exhaust gas temperature (T3) of the turbine (11) comprises the step of calculating a control signal (Uc) on the basis of fuel flow (QF) and power output (P) values of the plant (1) .
16) A method as claimed in Claim 15 dependent on Claim 14, characterized in that the step of controlling an exhaust gas temperature (T3) of the turbine (11) comprises the step of selectively calculating the drive signal (UIGV) on the basis of the control signal (Uc) .
EP07827626A 2007-08-01 2007-08-01 Device and method for regulating the exhaust temperature of a gas turbine Withdrawn EP2185868A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2007/000556 WO2009016665A1 (en) 2007-08-01 2007-08-01 Device and method for regulating the exhaust temperature of a gas turbine

Publications (1)

Publication Number Publication Date
EP2185868A1 true EP2185868A1 (en) 2010-05-19

Family

ID=39272383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07827626A Withdrawn EP2185868A1 (en) 2007-08-01 2007-08-01 Device and method for regulating the exhaust temperature of a gas turbine

Country Status (2)

Country Link
EP (1) EP2185868A1 (en)
WO (1) WO2009016665A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20090766A1 (en) * 2009-05-06 2010-11-07 Ansaldo Energia Spa DEVICE AND METHOD TO CHECK THE TEMPERATURE AT THE DISCHARGE OF A GAS TURBINE OF AN ENERGY PRODUCTION PLANT
ITMI20110811A1 (en) * 2011-05-10 2012-11-11 Ansaldo Energia Spa METHOD OF CONTROL TO CONTROL THE GAS FEED DRIVES AT LEAST ONE BURNER GROUP OF A GAS TURBINE PLANT AND GAS TURBINE SYSTEM
US9021779B2 (en) 2011-06-15 2015-05-05 General Electric Company Systems and methods for combustor emissions control
ITMI20131817A1 (en) * 2013-10-31 2015-05-01 Ansaldo Energia Spa METHOD AND CONTROL DEVICE TO CONTROL A GAS TURBINE ELECTRIC ENERGY PRODUCTION PLANT
US10801361B2 (en) 2016-09-09 2020-10-13 General Electric Company System and method for HPT disk over speed prevention

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867084A (en) * 1954-03-22 1959-01-06 Bendix Aviat Corp Fuel feed and power control system for gas turbine engines having an engine temperature control
BE790124A (en) * 1971-10-15 1973-04-16 Westinghouse Electric Corp IMPROVEMENTS TO A DIGITAL COMPUTER CONTROL SYSTEM OF AN INDUSTRIAL GAS TURBINE APPLIANCE
US3956883A (en) * 1974-08-08 1976-05-18 Westinghouse Electric Corporation Smooth and highly responsive gas turbine temperature limit control especially useful in combined cycle electric power plants
US4380146A (en) * 1977-01-12 1983-04-19 Westinghouse Electric Corp. System and method for accelerating and sequencing industrial gas turbine apparatus and gas turbine electric power plants preferably with a digital computer control system
US6715916B2 (en) * 2001-02-08 2004-04-06 General Electric Company System and method for determining gas turbine firing and combustion reference temperatures having correction for water content in fuel
US7246002B2 (en) * 2003-11-20 2007-07-17 General Electric Company Method for controlling fuel splits to gas turbine combustor
ITMI20042542A1 (en) * 2004-12-29 2005-03-29 Ansaldo Energia Spa DEVICE AND METHOD OF CONTROL OF A GAS TURBINE ELECTRIC ENERGY PRODUCTION PLANT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009016665A1 *

Also Published As

Publication number Publication date
WO2009016665A1 (en) 2009-02-05

Similar Documents

Publication Publication Date Title
EP1770331B1 (en) Method of controlling bypass air split to gas turbine combustor
RU2665773C2 (en) Gas turbine plant operation method with step and / or sequential combustion
US6912856B2 (en) Method and system for controlling gas turbine by adjusting target exhaust temperature
US8276363B2 (en) Method for compensating for combustion efficiency in fuel control system
JP5550592B2 (en) Gas turbine control device
US9863315B2 (en) Gas turbine and operation method of gas turbine
EP2085588B1 (en) Intake air heating control apparatus for gas turbine
US10669959B2 (en) Control device, system, control method, power control device, gas turbine, and power control method
WO2009060889A1 (en) Operation controller and operation control method of gas turbine
KR101843698B1 (en) Control device, system, and control method
CN106062343B (en) Control system and method for controlling gas-turbine unit during transition
JP2017505403A (en) Method for operating a gas turbine at partial load
CN110195715B (en) Control method and device for adjustable guide vane of mechanical equipment and mechanical equipment
WO2009016665A1 (en) Device and method for regulating the exhaust temperature of a gas turbine
KR20180006274A (en) Plant control apparatus, plant control method and power plant
US10125695B2 (en) Automatic control of turbine blade temperature during gas turbine engine operation
KR102346323B1 (en) A method for operating a gas turbine power plant on gas fuel
US10408135B2 (en) Method for operating a gas turbine below the nominal power thereof
EP1990521A1 (en) Pressure dynamics reduction within a gas turbine engine
EP2249006B1 (en) Device and method for controlling the exhaust temperature of a gas turbine of a power plant
CN109210572B (en) Second stage combustor for sequential combustor of gas turbine
RU2444640C2 (en) Device and method of gas turbine engine exhaust temperature adjustment
US10794297B2 (en) Method for operating a gas turbine installation and a gas turbine installation for carrying out the method
KR101253750B1 (en) An apparatus controlling extraction steam of a top heater to improve speed regulation rate of power plant
JP2016050571A (en) Control device, system, and control method

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100227

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20130301