CN112253317A - Closed-loop combustion control system and control method thereof - Google Patents
Closed-loop combustion control system and control method thereof Download PDFInfo
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- CN112253317A CN112253317A CN202011247405.7A CN202011247405A CN112253317A CN 112253317 A CN112253317 A CN 112253317A CN 202011247405 A CN202011247405 A CN 202011247405A CN 112253317 A CN112253317 A CN 112253317A
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- control system
- gas turbine
- combustion
- duty
- controller
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- 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
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- 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
- F02C9/16—Control of working fluid flow
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- 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
- F05D2270/14—Purpose of the control system to control thermoacoustic behaviour in the combustion chambers
Abstract
The invention provides a closed loop combustion control system and a control method thereof, wherein the closed loop combustion control system comprises the following steps: the gas turbine comprises a combustion chamber, an on-duty valve for adjusting the air supply amount of on-duty air and a gas turbine control system for controlling the opening degree of the on-duty valve; a combustion state detector for measuring the intensity of thermo-acoustic oscillations in the combustion chamber, the combustion state detector being disposed on the combustion chamber; the self-adaptive combustion regulation and control system comprises a controller, an analog quantity receiving module, an analog quantity sending module and a digital quantity transceiving module, wherein the analog quantity receiving module is respectively connected with the controller and a combustion state detector, the analog quantity sending module is respectively connected with the controller and a gas turbine control system, and the digital quantity transceiving module is respectively connected with the controller and the gas turbine control system. The invention can monitor and adjust the combustion state of the combustion chamber in real time and ensure the combustion stability of the gas turbine.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a closed-loop combustion control system and a control method thereof.
Background
In the load-carrying stage of the gas turbine, when the combustion is unstable, the acceleration amplitude of the combustion chamber becomes large, the acceleration amplitude continuously deteriorates to cause load shedding or trip accidents, and the more serious condition can cause the damage of the combustion chamber tile, so that the irreparable economic loss is caused. Thermoacoustic oscillations in gas turbine combustors are a major cause of deterioration in combustor acceleration, and a humming probe is used in a gas turbine to measure the intensity of thermoacoustic oscillations in the combustor.
The causes of unstable combustion are environmental factors, fuel composition changes and unit aging. In order to avoid the too large amplitude of the thermoacoustic oscillation in the combustion chamber, the prior art is to search for a stable combustion boundary during the thermal state debugging period, and to ensure the combustion stability margin by setting the intermediate quantity of the duty gas and the combustion temperature, and belongs to an open-loop control mode.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a closed-loop combustion control system and a control method thereof, which can monitor and adjust the combustion state of the combustion chamber in real time to ensure the combustion stability of the gas turbine.
In order to solve the above-mentioned technical problem, the present invention provides a closed-loop combustion control system including:
the gas turbine comprises a combustion chamber, an on-duty valve for adjusting the air supply amount of on-duty air and a gas turbine control system for controlling the opening degree of the on-duty valve;
a combustion state detector for measuring the intensity of thermo-acoustic oscillations in the combustion chamber, the combustion state detector being disposed on the combustion chamber;
the self-adaptive combustion regulation and control system comprises a controller, an analog quantity receiving module, an analog quantity sending module and a digital quantity transceiving module, wherein the analog quantity receiving module is respectively connected with the controller and a combustion state detector, the analog quantity sending module is respectively connected with the controller and a gas turbine control system, and the digital quantity transceiving module is respectively connected with the controller and the gas turbine control system.
Preferably, the combustion state detector includes a humming probe that measures the intensity of combustion chamber thermo-sound and an acceleration probe that detects the intensity of combustion chamber oscillations.
Preferably, the number of the combustion chambers and the number of the combustion state detectors are equal, each of the combustion state detectors being provided on the corresponding combustion chamber.
Preferably, the adaptive combustion regulation and control system further comprises a setting module for setting a thermoacoustic oscillation threshold and an on-duty gas offset, and the setting module is connected with the controller.
Preferably, the closed-loop combustion control system further comprises a cabinet, and the gas turbine control system and the adaptive combustion regulation and control system are arranged in the cabinet.
The invention also provides a control method of the closed-loop combustion control system, which comprises the following steps:
s1, setting the thermoacoustic oscillation threshold of the combustion chamber according to the normal operation state of the gas turbine;
s2, the combustion state detector measures the thermoacoustic oscillation intensity in the combustion chamber in real time, and the analog quantity receiving module collects the analog quantity measurement value representing the thermoacoustic oscillation intensity to the controller; the controller receives an operation instruction of the gas turbine control system through the digital quantity transceiving module;
s3, comparing the analog quantity measured value with the thermoacoustic oscillation threshold value by the controller, if the analog quantity measured value is larger than the thermoacoustic oscillation threshold value, sending an on-duty gas offset instruction obtained by the analysis of the controller to the gas turbine control system by the analog quantity sending module, and adjusting the opening of the on-duty valve by the gas turbine control system according to the on-duty gas offset instruction so as to enable the on-duty gas offset and the original on-duty gas quantity to be superposed and flow into the combustion chamber; if not, keeping the opening of the duty valve; and the digital quantity transceiving module feeds back the running state of the self-adaptive combustion regulation and control system obtained by the analysis of the controller to the gas turbine control system.
Preferably, the step S1 further includes: the gas turbine is operated under load, and the adjustable inlet guide vanes for adjusting the air supply amount are in an open state.
Preferably, when the adjustable air inlet guide vane is in a fully open state, if the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value, the controller does not send an on-duty gas offset instruction to the gas turbine control system; if the analog quantity measurement value is larger than the thermoacoustic oscillation threshold value, the controller sends an on-duty gas offset instruction to the gas turbine control system, and the gas turbine control system gradually increases the opening of the on-duty valve according to a preset valve opening speed until the analog quantity measurement value is not larger than the thermoacoustic oscillation threshold value or the opening of the on-duty valve is increased to the opening corresponding to the maximum on-duty gas offset.
Preferably, when the adjustable air inlet guide vane is in a non-fully-opened state, if the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value, the controller does not send an on-duty gas offset instruction to the gas turbine control system; if the analog quantity measurement value is larger than the thermoacoustic oscillation threshold value, the controller sends an on-duty gas offset instruction to the gas turbine control system, and the gas turbine control system gradually increases the opening of the on-duty valve according to a preset valve opening speed until the analog quantity measurement value is not larger than the thermoacoustic oscillation threshold value or the opening of the on-duty valve is increased to the opening corresponding to the maximum on-duty gas offset.
Preferably, the thermoacoustic oscillation threshold comprises a first threshold and a second threshold greater than the first threshold; the preset valve opening speed includes a first speed corresponding to the first threshold value and a second speed corresponding to the second threshold value, the second speed being greater than the first speed.
As described above, the closed-loop combustion control system and the control method thereof according to the present invention have the following advantageous effects: in the invention, the controller is used for the operation and analysis of the control program and has a self-diagnosis function; the analog quantity receiving module is used for collecting an analog quantity measured value measured by the combustion state detector, and the thermoacoustic oscillation intensity can be the thermoacoustic intensity of the combustion chamber or the oscillation intensity of the combustion chamber; the analog quantity sending module is used for transmitting an on-duty gas offset instruction to the gas turbine control system; the controller receives the operation instruction of the gas turbine control system through the digital quantity transceiving module and feeds back the operation state of the self-adaptive combustion regulation and control system to the gas turbine control system. When the self-adaptive combustion regulation and control system runs, the controller receives the running instruction of the gas turbine control system through the digital quantity receiving and sending module and feeds back the running state of the self-adaptive combustion regulation and control system to the gas turbine control system, the combustion state detector measures the thermoacoustic oscillation intensity in the combustion chamber in real time, and the analog quantity receiving module collects the analog quantity measured value representing the thermoacoustic oscillation intensity to the controller. And the controller judges and analyzes the analog quantity measured value, sends a corresponding instruction to the gas turbine control system according to the analysis result, and adjusts the opening of the on-duty valve to enable the combustion state of the combustion chamber to be stable all the time. Therefore, the invention can monitor and adjust the combustion state of the combustion chamber in real time and ensure the combustion stability of the gas turbine.
Drawings
FIG. 1 is a schematic diagram of a closed loop combustion control system of the present invention.
Description of the element reference numerals
1 gas turbine
11 combustion chamber
12 duty valve
13 gas turbine control system
2 combustion state detector
21 buzz probe
22 acceleration probe
3 self-adaptive combustion regulation and control system
31 controller
32 analog quantity receiving module
33 analog quantity emitting module
34 digital quantity transceiver module
35 setting module
4 machine cabinet
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not limited to the technical essence, and any structural modifications, ratio changes, or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1, the present invention provides a closed-loop combustion control system including:
the gas turbine 1, the gas turbine 1 includes the combustion chamber 11, adjusts the duty valve 12 of the gas supply amount on duty, and controls the gas turbine control system 13 of the valve 12 aperture on duty;
a combustion state detector 2 for measuring the intensity of the thermo-acoustic oscillations in the combustion chamber 11, the combustion state detector 2 being disposed on the combustion chamber 11;
the self-adaptive combustion regulation and control system 3 comprises a controller 31, an analog quantity receiving module 32, an analog quantity sending module 33 and a digital quantity transceiving module 34, wherein the analog quantity receiving module 32 is respectively connected with the controller 31 and the combustion state detector 2, the analog quantity sending module 33 is respectively connected with the controller 31 and the gas turbine control system 13, and the digital quantity transceiving module 34 is respectively connected with the controller 31 and the gas turbine control system 13.
In the present invention, the controller 31 is used for operation and analysis of a control program (for example, a thermoacoustic oscillation threshold setting program and a duty offset setting program), and has a self-diagnosis function; the analog quantity receiving module 32 is used for collecting the analog quantity measured value measured by the combustion state detector 2, and the thermoacoustic oscillation intensity can be the thermoacoustic intensity of the combustion chamber 11 or the oscillation intensity of the combustion chamber 11; the analog quantity sending module 33 is used for transmitting an on-duty gas offset instruction to the gas turbine control system 13; the controller 31 receives the operation instruction of the gas turbine control system 13 through the digital transceiver module 34 and feeds back the operation state of the adaptive combustion regulation and control system 3 to the gas turbine control system 13. During operation, the controller 31 receives an operation instruction of the gas turbine control system 13 through the digital quantity transceiver module 34 and feeds back the operation state of the adaptive combustion regulation and control system 3 to the gas turbine control system 13, the combustion state detector 2 measures the thermoacoustic oscillation intensity in the combustion chamber 11 in real time, and the analog quantity receiving module 32 collects an analog quantity measurement value representing the thermoacoustic oscillation intensity to the controller 31. The controller 31 judges and analyzes the analog measurement value, and sends a corresponding command to the gas turbine control system 13 according to the analysis result, and adjusts the opening of the on-duty valve 12 so that the combustion state of the combustion chamber 11 is always stable. For example, comparing the analog quantity measurement value with the thermoacoustic oscillation threshold, if the analog quantity measurement value is greater than the thermoacoustic oscillation threshold, the analog quantity sending module 33 sends an on-duty gas offset instruction obtained by analysis by the controller 31 to the gas turbine control system 13, and the gas turbine control system 13 adjusts the opening of the on-duty valve 12 according to the on-duty gas offset instruction, so that the on-duty gas offset and the original on-duty gas amount are overlapped and flow into the combustion chamber 11, and the purpose of stable combustion is achieved; if not, the opening degree of the duty valve 12 is kept; the digital quantity transceiving module 34 sends the operation instruction obtained by the analysis of the controller 31 to the gas turbine control system 13, so as to ensure the safe operation of the gas turbine control system 13. Therefore, the closed-loop combustion control system of the present invention can monitor and adjust the combustion state of the combustion chamber 11 in real time, and ensure the combustion stability of the gas turbine 1.
In order to comprehensively consider the intensity of the thermo-acoustic oscillation in the combustion chamber 11, the combustion state detector 2 includes a humming probe 21 for measuring the intensity of the thermo-acoustic oscillation in the combustion chamber 11 and an acceleration probe 22 for detecting the oscillation intensity in the combustion chamber 11.
In order to set thermoacoustic oscillation thresholds of different sizes according to the unstable degree of the combustion state of the combustion chamber 11, the adaptive combustion regulation and control system 3 further includes a setting module 35 for setting the thermoacoustic oscillation threshold and the duty offset, and the setting module 35 is connected to the controller 31.
In order to improve the integration level of the closed-loop combustion control system, the closed-loop combustion control system further comprises a cabinet 4, and the gas turbine control system 13 and the adaptive combustion regulation and control system 3 are arranged in the cabinet 4.
The invention also provides a control method of the closed-loop combustion control system, which comprises the following steps:
s1, setting the thermoacoustic oscillation threshold of the combustion chamber 11 according to the normal operation state of the gas turbine 1;
s2, the combustion state detector 2 measures the thermoacoustic oscillation intensity in the combustion chamber 11 in real time, and the analog quantity receiving module 32 collects the analog quantity measured value representing the thermoacoustic oscillation intensity to the controller 31; the controller 31 receives an operation instruction of the gas turbine control system 13 through the digital quantity transceiving module 34;
s3, the controller 31 compares the analog quantity measured value with the thermoacoustic oscillation threshold value, if the analog quantity measured value is larger than the thermoacoustic oscillation threshold value, the analog quantity sending module 33 sends the shift gas offset instruction obtained by the analysis of the controller 31 to the gas turbine control system 13, and the gas turbine control system 13 adjusts the opening of the shift valve 12 according to the shift gas offset instruction, so that the shift gas offset and the original shift gas amount are superposed and flow into the combustion chamber 11, and the purpose of stable combustion is realized; if not, the opening degree of the duty valve 12 is kept; the digital quantity transceiving module 34 feeds back the operation state of the adaptive combustion regulation and control system 3 analyzed by the controller 31 to the gas turbine control system 13.
The control method of the invention can monitor and adjust the combustion state of the combustion chamber 11 in real time, and ensure the combustion stability of the gas turbine 1.
The combustion state of the gas turbine 1 is directly related to the load factor, and since the gas turbine 1 operates stably under the low-load condition (i.e., the adjustable inlet guide vane is in the fully-closed state), the step S1 further includes: the gas turbine 1 is operated under load, and the adjustable inlet guide vanes for adjusting the air supply amount are in an open state.
When the adjustable gas inlet guide vane is in a fully open state (namely, the gas turbine runs at full load), if the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value, the controller 31 does not send an on-duty gas offset instruction to the gas turbine control system 13; if the analog quantity measurement value is greater than the thermoacoustic oscillation threshold value, the controller 31 sends an on-duty gas offset instruction to the gas turbine control system 13, and the gas turbine control system 13 gradually increases the opening of the on-duty valve 12 according to a preset valve opening speed until the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value or the opening of the on-duty valve 12 is increased to the opening corresponding to the maximum on-duty gas offset.
When the adjustable air inlet guide vane is in a non-fully-opened state (namely part load operation of the gas turbine), if the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value, the controller 31 does not send an on-duty gas offset instruction to the gas turbine control system 13; if the analog quantity measurement value is greater than the thermoacoustic oscillation threshold value, the controller 31 sends an on-duty gas offset instruction to the gas turbine control system 13, and the gas turbine control system 13 gradually increases the opening of the on-duty valve 12 according to a preset valve opening speed until the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value or the opening of the on-duty valve 12 is increased to the opening corresponding to the maximum on-duty gas offset.
In order to restore the combustion state of said combustion chamber 11 more quickly to a stable state, said thermo-acoustic oscillation threshold comprises a first threshold and a second threshold greater than the first threshold; the preset valve opening speed includes a first speed corresponding to the first threshold value and a second speed corresponding to the second threshold value, the second speed being greater than the first speed.
In summary, the closed-loop combustion control system and the control method thereof of the present invention can monitor and adjust the combustion state of the combustion chamber in real time, and ensure the combustion stability of the gas turbine. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A closed-loop combustion control system, comprising:
the gas turbine (1), the gas turbine (1) includes the combustion chamber (11), adjusts the duty valve (12) of the gas supply amount on duty, and control the gas turbine control system (13) of the valve (12) aperture on duty;
a combustion state detector (2) for measuring the intensity of the thermo-acoustic oscillations in the combustion chamber (11), the combustion state detector (2) being arranged on the combustion chamber (11);
self-adaptation burning regulation and control system (3), self-adaptation burning regulation and control system (3) are including controller (31), analog quantity receiving module (32), analog quantity sends module (33) and digital quantity transceiver module (34), analog quantity receiving module (32) are connected with controller (31) and combustion state detector (2) respectively, analog quantity sends module (33) and is connected with controller (31) and gas turbine control system (13) respectively, digital quantity transceiver module (34) are connected with controller (31) and gas turbine control system (13) respectively.
2. The closed-loop combustion control system of claim 1, wherein: the combustion state detector (2) comprises a humming probe (21) for measuring the thermoacoustic intensity of the combustion chamber (11) and an acceleration probe (22) for detecting the oscillation intensity of the combustion chamber (11).
3. The closed-loop combustion control system of claim 1, wherein: the self-adaptive combustion regulation and control system (3) further comprises a setting module (35) for setting a thermoacoustic oscillation threshold and an on-duty gas offset, and the setting module (35) is connected with the controller (31).
4. The closed-loop combustion control system of claim 1, wherein: the closed-loop combustion control system further comprises a cabinet (4), and the gas turbine control system (13) and the adaptive combustion regulation and control system (3) are arranged in the cabinet (4).
5. A control method of the closed-loop combustion control system according to any one of claim 1 to claim 4, characterized by comprising the steps of:
s1, setting the thermoacoustic oscillation threshold of the combustion chamber (11) according to the normal operation state of the gas turbine (1);
s2, the combustion state detector (2) measures the thermoacoustic oscillation intensity in the combustion chamber (11) in real time, and the analog quantity receiving module (32) collects the analog quantity measured value representing the thermoacoustic oscillation intensity to the controller (31); the controller (31) receives an operation instruction of the gas turbine control system (13) through the digital quantity transceiving module (34);
s3, the controller (31) compares the analog quantity measured value with the thermoacoustic oscillation threshold value, if the analog quantity measured value is larger than the thermoacoustic oscillation threshold value, the analog quantity sending module (33) sends an on-duty gas offset quantity instruction obtained by analysis of the controller (31) to the gas turbine control system (13), and the gas turbine control system (13) adjusts the opening of the on-duty valve (12) according to the on-duty gas offset quantity instruction so that the on-duty gas offset quantity and the original on-duty gas quantity are superposed and flow into the combustion chamber (11); if not, the opening degree of the duty valve (12) is kept; and the digital quantity transceiving module (34) feeds back the running state of the adaptive combustion regulation and control system (3) analyzed by the controller (31) to the gas turbine control system (13).
6. The control method according to claim 5, characterized in that: the step S1 further includes:
the gas turbine (1) is operated under load, and the adjustable air inlet guide vanes for adjusting the air supply amount are in an open state.
7. The control method according to claim 6, characterized in that:
when the adjustable air inlet guide vane is in a full-open state, if the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value, the controller (31) does not send an on-duty air offset instruction to the gas turbine control system (13); if the analog quantity measurement value is larger than the thermoacoustic oscillation threshold value, the controller (31) sends an on-duty gas offset instruction to the gas turbine control system (13), and the gas turbine control system (13) gradually increases the opening of the on-duty valve (12) according to a preset valve opening speed until the analog quantity measurement value is not larger than the thermoacoustic oscillation threshold value or the opening of the on-duty valve (12) is increased to the opening corresponding to the maximum on-duty gas offset.
8. The control method according to claim 6, characterized in that:
when the adjustable air inlet guide vane is in a non-full-open state, if the analog quantity measurement value is not greater than the thermoacoustic oscillation threshold value, the controller (31) does not send an on-duty air offset instruction to the gas turbine control system (13); if the analog quantity measurement value is larger than the thermoacoustic oscillation threshold value, the controller (31) sends an on-duty gas offset instruction to the gas turbine control system (13), and the gas turbine control system (13) gradually increases the opening of the on-duty valve (12) according to a preset valve opening speed until the analog quantity measurement value is not larger than the thermoacoustic oscillation threshold value or the opening of the on-duty valve (12) is increased to the opening corresponding to the maximum offset.
9. The control method according to claim 7 or 8, characterized in that: the thermoacoustic oscillation threshold comprises a first threshold and a second threshold which is larger than the first threshold; the preset valve opening speed includes a first speed corresponding to the first threshold value and a second speed corresponding to the second threshold value, the second speed being greater than the first speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011247405.7A CN112253317A (en) | 2020-11-10 | 2020-11-10 | Closed-loop combustion control system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011247405.7A CN112253317A (en) | 2020-11-10 | 2020-11-10 | Closed-loop combustion control system and control method thereof |
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| CN112253317A true CN112253317A (en) | 2021-01-22 |
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| CN202011247405.7A Pending CN112253317A (en) | 2020-11-10 | 2020-11-10 | Closed-loop combustion control system and control method thereof |
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2020
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