WO2019010992A1 - Procédé et dispositif de commande de refroidissement de turbine pour turbine à gaz, et support de stockage - Google Patents

Procédé et dispositif de commande de refroidissement de turbine pour turbine à gaz, et support de stockage Download PDF

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Publication number
WO2019010992A1
WO2019010992A1 PCT/CN2018/078800 CN2018078800W WO2019010992A1 WO 2019010992 A1 WO2019010992 A1 WO 2019010992A1 CN 2018078800 W CN2018078800 W CN 2018078800W WO 2019010992 A1 WO2019010992 A1 WO 2019010992A1
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WIPO (PCT)
Prior art keywords
turbine
cooling
cooling water
gas turbine
temperature
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PCT/CN2018/078800
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English (en)
Chinese (zh)
Inventor
邱利雄
刘江
程伟
王雨田
马生福
张明
Original Assignee
中国神华能源股份有限公司
北京国华电力有限责任公司
神华国华（北京）燃气热电有限公司
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Publication of WO2019010992A1 publication Critical patent/WO2019010992A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/12—Cooling

Definitions

  • the present invention relates to the field of industrial system control, and in particular to a gas turbine turbine cooling control method and apparatus, and a storage medium.
  • a gas turbine In a thermal power generation system, a gas turbine is usually used to burn fuel such as natural gas to generate heat, which is used to generate electricity.
  • Fig. 5 is a schematic diagram showing the structure and principle of a power generation system when a certain type of gas turbine is suitable for thermal power generation. In Fig. 5, for the sake of distinction, the gas flow direction is indicated by a broken line, and the liquid or vapor flow direction is indicated by a solid line.
  • the gas turbine includes a compressor, a combustion chamber, and a turbine.
  • the combustion chamber burns fuel such as natural gas to generate high temperature gas
  • the compressor supplies compressed air to the combustion chamber to provide oxygen required for combustion of the fuel
  • the high temperature gas generated by the combustion chamber is mostly supplied to the turbine to push the turbine to rotate at a high speed.
  • Turbine is a machine that converts the energy contained in a fluid medium into mechanical work, also known as a turbine.
  • the compressor supplies a portion of the air to the turbine cooling system (TCA), and the gas supplied to the TCA is cooled by the cooling water to cool the turbine.
  • TCA turbine cooling system
  • the waste flue gas generated by combustion also contains a large amount of heat.
  • the waste heat of this part of waste flue gas is recovered by the economizer and can be used for boiler heating, or it can be used as shown in Figure 5.
  • the coal machine separates the water vapor through the high-pressure steam drum, and the water vapor is reheated by the evaporator and the superheater to supply power for the steam turbine to generate electricity, thereby achieving the purpose of saving energy.
  • the economizer and the turbine turbine temperature should not be too high, otherwise it will cause failure, so the thermal power generation system also includes a high-pressure cooling water supply device.
  • the high pressure cooling water supply line simultaneously supplies cooling water to the gas and turbine cooling devices.
  • the cooling water passes through the economizer and the turbine cooling device, the cold water becomes high-temperature cooling water after heat exchange, and the heat of the high-temperature cooling water is further recovered by the high-pressure steam drum for heating in the boiler, or further processed as described above. It is then used for power generation, so the cooling water outlet of the economizer and the cooling water outlet of the turbine cooling unit are connected to the high pressure steam drum.
  • the TCA outlet is also connected to the condenser for recovering the cooling water when the temperature of the high temperature cooling water discharged from the TCA outlet is not high enough.
  • the pressure of the high-pressure water supply device (such as the high-pressure feed water pump) that supplies the cooling water is required.
  • the outlet pressure of the high-pressure feed water pump must not be lower than 9 MPa, and as the gas turbine load becomes higher and higher, the high pressure The outlet pressure of the feed water pump is also getting higher and higher.
  • the outlet pressure of the high pressure feed water pump is required to be no less than 14MPa.
  • the pressure of the high pressure feed water pump spoon is not lower than 14MPa after the automatic control.
  • the fluctuation of cooling water flow in the medium TCA is not conducive to the safe operation of the unit; the flow of TCA cooling water is too large, resulting in low flow rate on the high-pressure economizer side, which easily causes overheating of the high-pressure economizer and vaporization of the outlet, which affects the safety of the boiler; TCA When the flow rate of the cooling water is too large, the flow rate of the cooling water supplied to the economizer becomes small, so that the temperature discharged from the TCA outlet to the high pressure steam drum is likely to be low, and the economizer outlet temperature is too high, thereby causing the TCA to be discharged.
  • the water temperature difference between the high pressure steam drum and the water discharged from the economizer to the high pressure steam drum is too large, which is prone to pipeline vibration and disordered medium flow, which affects the safe operation of the system; the TCA cooling water pressure may be too high, and the flow rate is biased. Large, causing the turbine cooling air temperature RCA to fluctuate greatly, which is not conducive to the safe operation of the gas turbine.
  • the invention patent publication No. CN104632303A discloses an automatic intelligent cooling system and method for a gas turbine turbine.
  • the cooling system and method solve the problem that the automatic control cannot be realized when the cooling air outlet temperature is controlled by manually controlling the opening of the regulating valve to adjust the air flow rate into the gas cooler of the gas turbine, by the turbine cooler.
  • the temperature of the outlet and outlet air, the pressure, and the cooling water temperature, pressure, and cooling water flow at the outlet and inlet of the turbine cooler are automatically cooled.
  • a gas turbine air cooler is provided with a manual bypass valve, which adjusts the air flow rate of the gas cooler of the gas turbine according to the control signal, thereby controlling the cooling air. output temperature.
  • the object of the embodiments of the present invention is to provide a gas turbine cooling control method and device, and a storage medium, which can save energy in the turbine cooling control process and avoid pipeline impact, thereby ensuring the gas turbine unit. Stable operation.
  • an embodiment of the present invention provides a gas turbine turbine cooling control method, the method comprising: controlling an outlet pressure of a gas turbine cooling water supply device to be higher than a high pressure steam drum pressure of the gas turbine by a predetermined pressure;
  • the predetermined pressure may preferably be 2 MPa or less, and preferably 2 MPa, the cooling water supply device is for supplying cooling water to the turbine turbine cooling device; and the cooling water temperature at the outlet of the turbine turbine cooling device is controlled to Below the predetermined temperature.
  • controlling the temperature of the cooling water at the outlet of the turbine cooling device to be lower than the predetermined temperature may include controlling a flow rate of cooling water of the cooling device according to a temperature of the cooling water at the outlet of the turbine cooling device.
  • the predetermined temperature may preferably be 200 ° C or lower.
  • the flow rate of the cooling water of the turbine turbine cooling device can be controlled to be not lower than the flow threshold.
  • a gas turbine turbine cooling control device comprising: a pressure control module for controlling an outlet pressure of a gas turbine cooling water supply device to be higher than a high pressure steam drum of the gas turbine
  • the predetermined pressure may be preferably 2 MPa or less, and preferably 2 MPa, the cooling water supply device is for supplying cooling water to the turbine turbine cooling device; and a temperature control module for cooling the cooling The temperature of the cooling water at the outlet of the device is controlled to be lower than the predetermined temperature.
  • the temperature control module may include: a temperature detecting module for detecting a cooling water temperature of the cooling device outlet; and a flow control module for controlling the cooling water supply according to a cooling water temperature of the cooling device outlet The cooling water flow rate of the device.
  • the predetermined temperature may preferably be 200 ° C or lower.
  • the cooling water flow rate can be controlled not to be lower than the flow rate threshold.
  • the present invention provides a machine readable storage medium having stored thereon instructions for causing a machine to perform a gas turbine turbine cooling control method as described above in the present application.
  • the outlet pressure of the gas turbine cooling water supply device is controlled to be higher than a high pressure drum pressure of the gas turbine by a predetermined pressure, and the temperature of the cooling water at the outlet of the turbine turbine cooling device is controlled to be lower than
  • the temperature is predetermined to ensure that the cooling water does not vaporize before entering the steam drum, and the high pressure water supply device outlet is not required to have excessive pressure, which reduces the consumption of the cooling water and the power consumption of the high pressure feed pump, and avoids the cause.
  • the temperature of the cooling water is too high, it is found that vaporization causes a pipe impact.
  • FIG. 1 is a flow chart of a gas turbine turbine cooling control method according to an embodiment of the present invention
  • FIG. 2 is a flow chart of a gas turbine turbine cooling control method according to another embodiment of the present invention.
  • FIG. 3 is a block diagram showing the structure of a turbine turbine cooling control device according to an embodiment of the present invention.
  • Figure 4 is a block diagram showing the structure of a turbine turbine cooling control device according to an embodiment of the present invention.
  • Figure 5 is a schematic diagram showing the structure and principle of a power generation system when a certain type of gas turbine is suitable for thermal power generation;
  • FIG. 6 is a graph showing a decrease in power and current under a load corresponding to a feed water pump before and after adjustment of a gas turbine turbine cooling control method and apparatus to which the present invention is applied;
  • Figure 7 is a graph showing changes in the temperature of the RCA outlet of the gas turbine before and after adjustment of the gas turbine turbine cooling control method and apparatus to which the present invention is applied;
  • Figure 8 is a graph showing the pressure change of the gas turbine turbine cooling control method and apparatus to which the present invention is applied before and after adjusting the gas turbine TCA return steam regulating valve;
  • Figure 9 is a graph showing the pressure change of the gas turbine turbine cooling control method and apparatus to which the present invention is applied before and after adjusting the high pressure feed water pump of the gas turbine;
  • Figure 10 is a graph showing changes in the flow rate of the TCA cooling water inlet before and after adjustment of the gas turbine turbine cooling control method and apparatus to which the present invention is applied;
  • Figure 11 is a graph showing changes in the opening degree of the TCA return high pressure steam drum door before and after adjustment of the gas turbine turbine cooling control method and apparatus to which the present invention is applied;
  • Fig. 12 is a graph showing changes in the opening degree of the high-pressure feed water pump of the gas turbine before and after the adjustment of the gas turbine turbine cooling control method and apparatus to which the present invention is applied.
  • FIG. 1 is a flow chart of a gas turbine turbine cooling control method in accordance with an embodiment of the present invention. As shown in Figure 1, the method includes the following steps:
  • step S110 the outlet pressure of the turbine cooling water supply device is controlled to be higher than a high pressure drum pressure of the gas turbine for supplying a cooling water to the turbine turbine cooling device.
  • the outlet pressure of the gas turbine cooling water supply device is controlled to be higher than the high pressure steam drum pressure of the gas turbine, and the predetermined pressure can be achieved by controlling the opening degree of the valve of the cooling water supply line.
  • the turbine turbine cooling device can be, for example, a gas turbine turbine cooling system (TCA).
  • the predetermined pressure may preferably be 2 MPa or less, preferably 2 MPa.
  • the predetermined pressure value can also be obtained by testing according to different types of gas turbines.
  • the high pressure steam drum is a water storage or steam storage tool of the boiler.
  • the cooling water supplies the air supplied from the compressor outlet, the water temperature of the cooling water gradually increases, and therefore, is discharged from the outlet of the turbine cooling device.
  • the cooling water may be vaporized due to excessive temperature, and the generated water vapor enters the high pressure steam drum, and the residual heat of the water vapor enters the waste heat boiler, thereby recovering and reusing the heat.
  • step S120 the temperature of the cooling water at the outlet of the turbine turbine cooling device is controlled to be lower than a predetermined temperature. If the temperature of the cooling water discharged from the outlet of the turbine turbine cooling device is too high, the cooling water will be excessively vaporized, and the generated water vapor will impact the pipeline, and when the temperature of the cooling water discharged from the turbine cooling device outlet is too high, It may cause the management vibration of the high-pressure steam drum and the disorder of the medium due to the difference in the temperature of the cooling water from the gas outlet of the province.
  • the temperature of the cooling water at the outlet of the turbine turbine cooling device By controlling the temperature of the cooling water at the outlet of the turbine turbine cooling device to a predetermined value, the impact of the water vapor generated by the excessive vaporization on the pipeline can be avoided, and at the same time, the cooling effect on the turbine turbine can be prevented from being lowered.
  • the outlet pressure of the gas turbine cooling water supply device is controlled to be higher than the high pressure steam drum pressure of the gas turbine by a predetermined pressure, and on the one hand, the outlet pressure of the cooling water supply device is prevented from being excessively high, and the cooling water flow rate is excessively large.
  • the cooling water is wasted, and on the other hand, the high-temperature cooling water or water vapor discharged from the outlet of the turbine turbine cooling device can be advantageously transferred to the subsequent pipeline by using a higher pressure than the high-pressure steam drum, thereby improving the recovery efficiency of the waste heat.
  • the pressure difference between the cooling water and the high pressure steam drum of the turbine cooling device is reduced, so that the steam drum water level is stable and stable during the variable load operation of the gas turbine, and the gas turbine unit can be safely and stably operated while being safely and stably operated. Avoid the waste of cooling water and achieve energy saving.
  • step S210 is the same as step S110.
  • the method may further include the following steps:
  • step S220 the cooling water flow rate of the cooling water supply device is controlled according to the temperature of the cooling water at the outlet of the turbine turbine cooling device.
  • Controlling the flow rate of the cooling water of the cooling water supply device according to the temperature of the cooling water at the outlet of the turbine cooling device instead of individually controlling the flow of cooling water supplied to the turbine cooling device, thereby avoiding supply to
  • the increase of the cooling water flow rate of the turbine cooling device leads to a decrease in the cooling water flow rate of the economizer, and further avoids the difference between the high temperature cooling water at the economizer outlet and the high temperature cooling water at the outlet of the turbine cooling device. Large, resulting in high-pressure steam drum pipe impact.
  • the outlet pressure of the high-pressure water supply device can be controlled to be not lower than the pressure threshold, for example, 11 Mpa. .
  • the predetermined temperature may preferably be 200 ° C or lower.
  • the temperature of the cooling water at the outlet of the turbine cooling device is controlled to be lower than 200 ° C, which can effectively avoid excessive vaporization on the pipeline. Shock.
  • the high pressure water supply device can be controlled to increase the pressure and increase the amount of cooling water supplied to the turbine cooling device. Thereby increasing the flow rate of the cooling water to lower the temperature of the cooling water at the outlet of the turbine cooling device.
  • the pressure of the high pressure water supply device can be lowered to reduce the supply of cooling water.
  • the flow rate of the cooling water of the turbine turbine cooling device can be controlled to be not lower than the flow threshold.
  • the cooling water flow threshold may be set, and the flow threshold may preferably be 20 t/h lower than the cooling water flow during normal operation.
  • the apparatus includes: a pressure control module 10 for controlling an outlet pressure of the gas turbine cooling water supply device to be higher than a high pressure drum pressure of the gas turbine by a predetermined pressure, the cooling water supply device being used for Cooling water is supplied to the turbine turbine cooling device; and a temperature control module 20 is configured to control the temperature of the cooling water at the outlet of the cooling device to be lower than a predetermined temperature.
  • the predetermined pressure may preferably be 2 MPa or less, and more preferably 2 MPa.
  • the predetermined pressure value can also be obtained by testing according to different types of gas turbines.
  • FIG. 4 is a block diagram showing the structure of a turbine turbine cooling control device according to an embodiment of the present invention.
  • the temperature control module 20 may include: a temperature detecting module 21 for detecting a cooling water temperature of the cooling device outlet; and a flow control module 22 for cooling water according to the cooling device outlet The temperature controls the flow rate of the cooling water of the cooling water supply device.
  • the predetermined temperature may preferably be 200 ° C or lower. Those skilled in the art can also set the predetermined temperature to other temperatures according to the actual operation of the gas turbine.
  • the cooling water flow rate can be controlled not to be lower than the flow rate threshold.
  • the flow threshold may preferably be 20 t/h lower than the cooling water flow during normal operation.
  • the flow threshold can be set to 30t/h.
  • Tables 1 and 2 are the changes in the cooling water flow rate of the turbine turbine cooling unit under the partial load of the No. 1 and No. 2 gas turbines respectively.
  • the pre-optimized flow rate refers to the application before the optimization of the solution of the present invention.
  • the flow value, the optimized flow refers to the flow value after optimization using the solution of the present invention.
  • the No. 1 waste heat boiler high-pressure feed water pump saves about 290 KW per hour under the same operating conditions
  • the No. 2 waste heat boiler high-pressure feed pump saves 240 KW per hour.
  • the first unit runs 7181 hours a year
  • the second unit runs 5954 hours a year.
  • the electricity price per KWh is 0.65 yuan.
  • the economic benefit of the present invention is remarkable.
  • 6-12 are graphs showing changes in the parameters related to the turbine cooling before and after the application of the present invention, respectively.
  • the abscissa indicates the number of the data group, which has no practical significance.
  • Figure 6 shows the change of current and power of the No. 2 waste heat boiler high-pressure feed pump.
  • the above-mentioned No. 2 waste heat boiler high-pressure feed pump has a significant drop in current and power.
  • Figure 7 before and after the project optimization, the RCA temperature of the key indicator of the gas turbine did not fluctuate significantly, and the gas turbine operated smoothly.
  • Figure 8-10 visually reflects the optimization of TCA high-pressure feed water after the project is rebuilt. It can be seen that the high-pressure feed pump outlet, TCA inlet pressure and TCA inlet cooling water flow have different amplitudes in different load sections, economic and safety. The effect is obvious.
  • Figure 11-12 can reflect that after the implementation of the project transformation, the opening of the TCA high pressure steam drum door is obviously changed, but the opening of the high pressure water supply door has no obvious change, which indicates that the energy saving of the TCA cooling water flow is optimized after the project is implemented. Moreover, it can ensure that the water level adjustment characteristics of the high-pressure steam drum have no obvious change, and the system runs smoothly.
  • the TCA cooling water flow temperature changes smoothly, and the change of the corresponding combustion engine RCA (Root Cause Analysis) is stable, which effectively solves the TCA cooling during the variable load of the gas turbine.
  • RCA Root Cause Analysis
  • the opening degree of the feed water pump spoon is lower than before, and the deviation of the standby feed pump is reduced, which reduces the operation risk of the feed pump.
  • the opening of the high-pressure feed water pump spoon is generally in the range of 50-56% opening range (50%-100% load section), while the standby high-pressure feed water pump spoon opening defaults to 30%, such as running the pump trip, the standby pump is connected.
  • the tracking pressure setting value because the opening degree is large, the feed pump main pipe pressure can not be quickly raised to the pre-trip state, which may cause the TCA flow to trip low.
  • the opening of the high-pressure feed pump spoon tube is reduced to 43% in the 50% load section, which greatly reduces the deviation of the opening degree of the running pump and the standby pump.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present invention.
  • FIG. 1 A block diagram illustrating an exemplary computing environment in accordance with the present invention.
  • a program instructing related hardware may be completed by a program instructing related hardware, and the program is stored in a storage medium, and includes a plurality of instructions to make one (may be a single chip microcomputer, A chip or the like or a processor performs all or part of the steps of the method described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Control Of Turbines (AREA)

Abstract

L'invention concerne un procédé et un dispositif de commande de refroidissement de turbine pour une turbine à gaz, appartenant au domaine de la commande de système industriel. Le procédé comprend les étapes consistant: à commander une pression de sortie d'un dispositif d'alimentation en eau de refroidissement de turbine à gaz à une pression prédéterminée qui est supérieure à une pression de tambour de vapeur haute pression de la turbine à gaz, le dispositif d'alimentation en eau de refroidissement étant utilisé pour fournir de l'eau de refroidissement au dispositif de refroidissement de turbine à gaz; et à commander une température d'eau de refroidissement du dispositif de refroidissement de turbine à gaz à une température inférieure à une température prédéfinie. Le procédé et le dispositif conservent, non seulement, de l'énergie pendant un processus de commande de refroidissement de turbine à gaz, mais évitent également des collisions de tuyau, garantissant ainsi un fonctionnement stable d'un ensemble de turbines à gaz.
PCT/CN2018/078800 2017-07-14 2018-03-13 Procédé et dispositif de commande de refroidissement de turbine pour turbine à gaz, et support de stockage WO2019010992A1 (fr)

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CN201710574082.4A CN107448249A (zh) 2017-07-14 2017-07-14 燃机透平冷却控制方法及装置、存储介质
CN201710574082.4 2017-07-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113217193A (zh) * 2021-05-14 2021-08-06 西北工业大学 一种涡轮机轮盘喷水冷却结构

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* Cited by examiner, † Cited by third party
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CN107448249A (zh) * 2017-07-14 2017-12-08 中国神华能源股份有限公司 燃机透平冷却控制方法及装置、存储介质

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CN107448249A (zh) * 2017-07-14 2017-12-08 中国神华能源股份有限公司 燃机透平冷却控制方法及装置、存储介质

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113217193A (zh) * 2021-05-14 2021-08-06 西北工业大学 一种涡轮机轮盘喷水冷却结构

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