CN112664327B - Control system and control method for regulating output power of gas turbine - Google Patents
Control system and control method for regulating output power of gas turbine Download PDFInfo
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- CN112664327B CN112664327B CN202011624477.9A CN202011624477A CN112664327B CN 112664327 B CN112664327 B CN 112664327B CN 202011624477 A CN202011624477 A CN 202011624477A CN 112664327 B CN112664327 B CN 112664327B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The invention provides a control system and a control method for regulating the output power of a gas turbine.A gas compressor of the gas turbine is sequentially provided with an adjustable inlet guide vane, an inlet stage movable vane and a first stage movable vane positioned at the downstream of an air discharge chamber according to the air inlet direction, the air discharge chamber is connected with an air discharge pipe, and the air discharge pipe is provided with an anti-surge air discharge valve with adjustable opening degree; the control system comprises a gas turbine controller, a pressure acquisition assembly, a temperature sensor, a gas turbine output power measurement sensor and an opening detection sensor, wherein the pressure acquisition assembly, the temperature sensor, the gas turbine output power measurement sensor and the opening detection sensor are all connected with the gas turbine controller, the pressure acquisition assembly is used for detecting the pressure at the inlet stage movable blade and the first stage movable blade, the opening detection sensor is used for detecting the opening of the anti-surge blow-off valve, and the temperature sensor is arranged at the inlet of the gas compressor and used for detecting the inlet temperature of the gas compressor. The invention can improve the output power of the combustion engine on the premise of ensuring the stable flow.
Description
Technical Field
The invention relates to the technical field of gas turbine control, in particular to a control system and a control method for adjusting the output power of a gas turbine.
Background
The heavy-duty gas turbine compressor is provided with an adjustable inlet guide vane for adjusting the inlet air flow of the compressor so as to control the output power of the gas turbine. The reduced rotating speed of the gas compressor is reduced along with the rise of the environmental temperature, and the inlet flow of the gas compressor is reduced under the condition that the opening of the adjustable inlet guide vane is not changed, so that the output of the gas turbine is reduced. At the moment, the inlet flow of the compressor can be improved by opening the adjustable inlet guide vane, so that the output of the gas turbine is improved. However, according to the general characteristics of the compressor, the inlet temperature is increased, the reduced rotation speed is reduced, the load of the inlet stage is increased, the stable working margin is reduced, and if the adjustable inlet guide vanes are further opened, the load of the inlet stage exceeds the bearing capacity of the adjustable inlet guide vanes, flow instability occurs, and the compressor stalls or surges when the load is serious. Therefore, in the existing combustion engine, the maximum opening value of the adjustable guide vane under different environmental temperatures is limited in a control strategy so as to ensure the operation safety, but the capability of improving the output power of the combustion engine under the high-temperature environment is also limited.
Therefore, a control method and a control system for increasing the output power of a gas turbine are needed.
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 control system and a control method for regulating the output power of a gas turbine, which solve the problem that the output power of the gas turbine is affected by the ambient temperature and the maximum power output is difficult to achieve in the prior art.
In order to solve the technical problem, the invention provides a control system for adjusting the output power of a gas turbine, wherein an adjustable inlet guide vane, an inlet stage movable vane and a first stage movable vane positioned at the downstream of an air discharge chamber are sequentially arranged in a gas compressor of the gas turbine according to the air inlet direction, the air discharge chamber is connected with an air discharge pipe, and the air discharge pipe is provided with an anti-surge air discharge valve with adjustable opening degree; the control system comprises a gas turbine controller, a pressure acquisition assembly, a temperature sensor, a gas turbine output power measurement sensor and an opening detection sensor, wherein the pressure acquisition assembly, the temperature sensor, the gas turbine output power measurement sensor and the opening detection sensor are all connected with the gas turbine controller, the pressure acquisition assembly is used for detecting the pressure at an inlet stage movable blade and a first stage movable blade, the opening detection sensor is used for detecting the opening of the anti-surge blow-off valve, and the temperature sensor is arranged at an inlet of the gas compressor and used for detecting the temperature at the inlet of the gas compressor.
Preferably, the pressure pick-up assembly includes a first pressure sensor disposed at a tip leading edge of the inlet stage bucket.
Preferably, the pressure collecting assembly comprises a second pressure sensor arranged at the front edge of the blade tip of the first stage movable blade.
Preferably, the opening detection sensor is configured to detect an opening of the anti-surge bleed valve at a position closest to an inlet of the compressor.
The invention also provides a control method for adjusting the output power of the gas turbine, wherein an adjustable inlet guide vane, an inlet stage movable vane and a first stage movable vane positioned at the downstream of an air discharge chamber are sequentially arranged in a gas compressor of the gas turbine according to the air inlet direction, the air discharge chamber is connected with an air discharge pipe, an anti-surge air discharge valve with adjustable opening degree is arranged on the air discharge pipe, and the control method comprises the following steps:
1) Detecting the inlet temperature of a compressor in a gas turbine, adjusting the adjustable inlet guide vane to be at the maximum opening corresponding to the inlet temperature, and detecting the initial output power of the compressor and recording the initial output power as P0;
2) Increasing the opening degree of the adjustable inlet guide vane by 1%;
3) Detecting whether a first pressure signal at the front edge of the inlet stage movable blade is stable, and if so, continuously increasing the opening of the adjustable inlet guide blade according to the step 2); if the pressure first signal fluctuates, performing step 4);
4) Adjusting the opening of the anti-surge bleed valve to increase by 1%, detecting a first pressure signal at the inlet stage movable blade, a second pressure signal at the first stage movable blade and the current output power of the compressor and marking as P1, and when the second pressure signal is stable and P1 is greater than P0, the first pressure signal is stable, continuing to increase the opening of the adjustable inlet guide vane according to the step 2); and when the second pressure signal fluctuates or P1 is less than P0, the opening of the anti-surge air release valve is adjusted to be reduced by 1%, the opening of the adjustable inlet guide vane is reduced by 1%, and the adjustment of the output power of the gas turbine is stopped.
Preferably, in the step 4), when the pressure second signal is stable and P1> P0, the pressure first signal fluctuates, and the opening of the anti-surge blow-off valve needs to be increased according to the step 4).
Preferably, the inlet temperature of the compressor in the gas turbine, the opening value of the anti-surge blow-off valve before stopping the adjustment of the output power of the gas turbine and the opening value of the adjustable inlet guide vane are recorded and stored.
Preferably, a maximum value of the output power of the gas turbine is preset to be P before the step 1), and when the first pressure signal is stable and the second pressure signal is stable and the pressure is detected to be P1> P, the adjustment of the output power of the gas turbine is stopped during the steps 1) to 4).
As described above, the control system and the control method for adjusting the output power of the gas turbine according to the present invention have the following advantageous effects:
the invention can monitor the stability of dynamic pressure signals of inlet stage movable blades of the compressor in the process of improving the output of the gas turbine by opening the inlet guide vane in a high-temperature environment, gradually open the adjustable anti-surge bleeding valve to relieve the flow stall of the inlet stage when flow instability occurs, and simultaneously monitor the stability of dynamic pressure signals of downstream movable blades of the bleeding cavity and the output power of the gas turbine, thereby improving the output power of the gas turbine on the premise of ensuring the flow stability.
Drawings
FIG. 1 is a schematic diagram of a control system for regulating the power output of a gas turbine according to the present invention.
FIG. 2 is a flow chart of a control method for regulating the output power of a gas turbine according to the present invention.
Description of the element reference numerals
1. Gas compressor
2. Adjustable inlet guide vane
3. Inlet stage rotor blade
4. First stage moving blade
5. Pressure acquisition assembly
6. Anti-surge blow-off valve
7. Opening degree detection sensor
8. Measuring sensor for output power of gas turbine
9. Temperature sensor
10. Gas turbine controller
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 control system for adjusting the output power of a gas turbine, wherein an adjustable inlet guide vane 2, an inlet stage movable vane 3 and a first stage movable vane 4 located at the downstream of an air discharge chamber are sequentially arranged in a compressor 1 of the gas turbine according to the air inlet direction, the air discharge chamber is connected with an air discharge pipe, and an anti-surge air discharge valve 6 with an adjustable opening degree is arranged on the air discharge pipe; the control system comprises a gas turbine controller 10, a pressure acquisition assembly 5, a temperature sensor 9, a gas turbine output power measurement sensor 8 and an opening detection sensor 7, wherein the pressure acquisition assembly, the temperature sensor 9, the gas turbine output power measurement sensor 8 and the opening detection sensor 7 are all connected with the gas turbine controller 10, the pressure acquisition assembly is used for detecting the pressure of the inlet stage movable blades 3 and the pressure of the first stage movable blades 4, the opening detection sensor 7 is used for detecting the opening of the anti-surge blow-off valve, and the temperature sensor 9 is arranged at the inlet of the gas compressor and used for detecting the temperature of the inlet of the gas compressor.
The control system of the embodiment can break through the original limitation of the opening degree of the inlet adjustable guide vane under the high-temperature environment and on the premise of stable operation, the adjustable inlet guide vane 2 is opened to a larger degree, the inlet flow of the gas compressor is further improved, and the output power (namely the output power of the gas turbine) of the gas turbine is further increased.
In this embodiment, the pressure collecting assembly includes two dynamic pressure sensors, which are a first pressure sensor and a second pressure sensor, respectively, the first pressure sensor is disposed at the blade tip leading edge of the inlet stage movable blade 3, and the second pressure sensor is disposed at the blade tip leading edge of the first stage movable blade 4 downstream of the bleeding chamber (also referred to as anti-surge bleeding air-pumping chamber), where the number of stages of the inlet stage is determined according to different compressor design characteristics, and is generally 1-2 stages. The signal collected by the dynamic pressure sensor can reflect the pressure fluctuation of the airflow in the blade tip area of the front edge of the movable blade after being processed, can be used for monitoring the flow stability, and can control the anti-surge blow-off valve 6 to be slowly opened when the dynamic pressure has larger fluctuation, so that the load of the inlet stage of the compressor is lightened until the pressure signal returns to normal.
The anti-surge bleed valve 6 in this embodiment refers to a valve on the bleed pipe connected to the anti-surge bleed air pumping chamber closest to the inlet of the compressor, i.e. the opening detection sensor 7 is used to detect the opening of the anti-surge bleed valve closest to the inlet of the compressor.
The present invention also provides a control method for regulating the output power of a gas turbine, which can be implemented by using the control system, the control method comprising the following steps: as shown in figure 2 of the drawings,
1) Detecting an inlet temperature T0 of a gas compressor in the gas turbine, adjusting the maximum opening degree of an adjustable inlet guide vane corresponding to the inlet temperature and recording the maximum opening degree as A%, and detecting initial output power (also called gas turbine output) of the gas compressor and recording the initial output power as P0;
2) Increasing the opening degree of the adjustable inlet guide vane by 1%, recording the opening degree of the adjustable inlet guide vane as B%, and recording the output power (also called the output of the combustion engine) of the compressor as P2;
3) Detecting whether a first pressure signal (also called an inlet stage dynamic pressure signal) at the front edge of the inlet stage movable blade is stable, and if so, continuously increasing the opening of the adjustable inlet guide vane according to the step 2); if the pressure first signal fluctuates, performing step 4);
4) Adjusting the opening of the anti-surge blow-off valve to increase by 1%, recording the opening of the anti-surge blow-off valve as C%, detecting a first pressure signal at the inlet stage movable blade, a second pressure signal at the first stage movable blade and the current output power of the compressor as P1, and determining a subsequent adjusting method according to the following logic:
a, when the pressure second signal is stable and P1> P0, then
a1, if the pressure first signal is stable, continuously increasing the opening of the adjustable inlet guide vane according to the step 2);
a2, if the first pressure signal still fluctuates, continuously increasing the opening of the anti-surge blow-off valve according to the step 4);
and B, when the second pressure signal fluctuates or P1 is less than P0, adjusting the opening of the anti-surge blow-off valve to be reduced by 1%, recording the opening of the anti-surge blow-off valve as (C-1)%, reducing the opening of the adjustable inlet guide vane by 1%, recording the opening of the adjustable inlet guide vane as (B-1)%, and stopping adjusting the output power of the gas turbine.
In the embodiment, when the adjustable guide vane is used for improving the air inlet flow, dynamic pressure signals (namely the first pressure signal and the second pressure signal) of the inlet stage are monitored, the anti-surge air release valve on the air release pipe is properly opened according to the flow state, the overhigh load of the inlet stage caused by the high-temperature environment and the opening of the adjustable guide vane is avoided, and therefore the output of the combustion engine in high-temperature weather is effectively improved and the operation safety is ensured. For the unit which is put into operation, the load range can be effectively enlarged, and the operation flexibility is improved. In addition, in the adjusting process, the adjustable inlet guide vane is opened to be beneficial to improving the output of the combustion engine, but the output of the combustion engine is possibly reduced in the process of gradually opening the surge relief wind-proof valve, and flow instability of a downstream compressor stage of the air discharge chamber is possibly caused, so that the output power of the combustion engine and the front edge pressure fluctuation of a downstream movable vane of the air discharge chamber need to be monitored simultaneously, and the adjusting process is stopped when the output is reduced or the flow instability occurs.
This embodiment still includes: and recording and storing the inlet temperature T0 of the compressor in the gas turbine, the opening value of the anti-surge blow-off valve before stopping adjusting the output power of the gas turbine, namely (C-1)% and the opening value of the adjustable inlet guide vane, namely (B-1)%. In the embodiment, the adjustment is respectively carried out according to the steps under different inlet temperatures T0, after the adjustment is finished, the opening variation quantity (including the maximum opening value (B-1)%) of different inlet guide vanes and the opening quantity (C-1)%) of the anti-surge bleeding valve required by the opening quantity can be determined to improve the output of the combustion engine and ensure the stable operation under different inlet temperatures, the rule is recorded in a gas turbine controller, and the automatic adjustment can be carried out according to the inlet temperature and the output requirement of the combustion engine during the subsequent operation.
In this embodiment, a maximum value of the output power of the gas turbine is preset before the step 1), and when the first pressure signal is stable and the second pressure signal is stable during the steps 1) to 4), and the pressure is detected to be P1> P or P2> P, the adjustment of the output power of the gas turbine may be stopped.
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 (4)
1. A control method for adjusting the output power of a gas turbine is characterized in that an adjustable inlet guide vane, an inlet stage movable vane and a first stage movable vane positioned at the downstream of an air discharge chamber are sequentially arranged in a gas compressor of the gas turbine according to the air inlet direction, the air discharge chamber is connected with an air discharge pipe, an anti-surge air discharge valve with adjustable opening degree is arranged on the air discharge pipe, and the control method comprises the following steps:
1) Detecting the inlet temperature of a gas compressor in the gas turbine, adjusting the adjustable inlet guide vane to be at the maximum opening corresponding to the inlet temperature, and detecting the initial output power of the gas compressor and marking as P0;
2) Increasing the opening degree of the adjustable inlet guide vane by 1%;
3) Detecting whether a first pressure signal at the front edge of the inlet stage movable blade is stable, and if so, continuously increasing the opening of the adjustable inlet guide blade according to the step 2); if the pressure first signal fluctuates, performing step 4);
4) Adjusting the opening of the anti-surge bleed valve to increase by 1%, detecting a first pressure signal at the inlet stage movable blade, a second pressure signal at the first stage movable blade and the current output power of the compressor and marking as P1, and when the second pressure signal is stable and P1 is greater than P0, the first pressure signal is stable, continuing to increase the opening of the adjustable inlet guide vane according to the step 2); and when the second pressure signal fluctuates or P1 is less than P0, the opening of the anti-surge air release valve is adjusted to be reduced by 1%, the opening of the adjustable inlet guide vane is reduced by 1%, and the adjustment of the output power of the gas turbine is stopped.
2. The control method for regulating output power of a gas turbine according to claim 1, wherein: in the step 4), when the second pressure signal is stable and P1> P0, the first pressure signal fluctuates, and the opening of the anti-surge blow-off valve needs to be continuously increased according to the step 4).
3. The control method for regulating output power of a gas turbine according to claim 1, wherein: and recording and storing the inlet temperature of a gas compressor in the gas turbine, the opening value of the anti-surge blow-off valve and the opening value of the adjustable inlet guide vane before stopping the adjustment of the output power of the gas turbine.
4. The control method for regulating output power of a gas turbine according to claim 1, wherein: presetting a maximum value of the output power of the gas turbine as P before the step 1), and stopping the adjustment of the output power of the gas turbine when the first pressure signal is stable and the second pressure signal is stable and the P1 is detected in the processes from the step 1) to the step 4).
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| CN113254879B (en) * | 2021-05-28 | 2022-08-30 | 华能太原东山燃机热电有限责任公司 | Method for calculating efficiency of gas compressor of gas turbine in real time |
| CN114542503A (en) * | 2022-02-23 | 2022-05-27 | 中国航发沈阳发动机研究所 | Regulating mechanism and method for outer duct flow field of double-duct compressor |
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| CN101311554A (en) * | 2007-05-24 | 2008-11-26 | 中国科学院工程热物理研究所 | Three-factor matching method for improving energy efficiency for blade type fluid machinery |
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| JPH05340385A (en) * | 1992-06-05 | 1993-12-21 | Hitachi Ltd | Rotating stall preventing device for compressor |
| US8639480B2 (en) * | 2010-09-20 | 2014-01-28 | General Electric Company | Methods and systems for modeling turbine operation |
| US11913476B2 (en) * | 2019-03-26 | 2024-02-27 | Mitsubishi Heavy Industries, Ltd. | Compressor system |
| CN110195715B (en) * | 2019-04-19 | 2020-07-28 | 中国神华能源股份有限公司 | Control method and device for adjustable guide vane of mechanical equipment and mechanical equipment |
| CN110296001A (en) * | 2019-07-29 | 2019-10-01 | 上海电气燃气轮机有限公司 | The regulating system and method for combined cycle unit part-load efficiency |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101311554A (en) * | 2007-05-24 | 2008-11-26 | 中国科学院工程热物理研究所 | Three-factor matching method for improving energy efficiency for blade type fluid machinery |
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