Gas turbine inlet air temperature adjusting system and method

Abstract

The invention relates to the technical field of power equipment temperature regulation, in particular to a gas turbine inlet air temperature regulation system and method.The gas turbine inlet air temperature regulation system comprises a heat pump circulation module which is responsible for compression, circulation and heat exchange of a heat exchange medium; the heat exchange module is responsible for adjusting inlet air of the gas turbine and discharging and exchanging heat of flue gas of the waste heat boiler; and the control and auxiliary module is responsible for switching and auxiliary functions of valves in the system. The dual-mode temperature regulating device has the beneficial effects that dual-mode operation of the compressor and the circulating pump is adopted, heat can be conveyed to the smoke side from the air side through phase-change heat exchange, energy can be conveyed to the air side from the smoke side in a liquid form, and the flexibility and efficiency of temperature regulation are remarkably improved; and air is pretreated through the air heat exchanger before entering the air compressor, adaptive air heating or cooling can be achieved, it is ensured that the gas turbine can keep the optimal air inlet temperature under different working conditions, and therefore the combustion efficiency and the unit performance are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment temperature regulation, and particularly to a gas turbine inlet air temperature regulation system and method. Background Art

[0002] With the continuous increase in the proportion of renewable energy (such as solar energy and wind energy) in the energy consumption structure, the stability of the power system faces challenges. Gas-steam combined cycle units, due to their ability to start and stop quickly and adjust the load flexibly, have become an important supplementary energy supply technical solution for renewable energy under the new trend of energy development. Especially due to economic growth and people's livelihood improvement, the construction of heating facilities in southern China has increased. At the same time, gas-steam combined cycle units have been widely used due to their advantages of cleanliness, high efficiency, and flexibility. Since most areas in southern China belong to the temperate and subtropical monsoon climate zones, the seasonal temperature difference is large.

[0003] In this climate environment, when the gas-steam combined cycle unit operates in summer, the high ambient temperature causes the inlet air temperature of the gas turbine to rise and the density to decrease, resulting in a decrease in the mass flow rate of the working medium of the gas turbine, a decrease in the work capacity and efficiency of the unit, and an impact on the economic benefits of the unit operation. When the gas-steam combined cycle unit operates in winter, the heating demand is high and the unit's heat load is high. Due to the coupling between the heat load and the power supply load of the gas-steam combined cycle unit, the peak shaving range of the gas-steam combined cycle unit is reduced and the peak shaving capacity is decreased in winter.

[0004] Currently, the commonly used solutions include technical solutions such as evaporative cooling, inlet guide vane (IGV) control, and absorption heat pump. Evaporative cooling reduces the inlet air temperature by spraying atomized water into the air inlet and using the heat absorption of water evaporation. This method is simple and low-cost, but its cooling efficiency is limited by air humidity, the cooling range is limited, and it is necessary to ensure that the temperature after cooling is higher than the wet bulb temperature to avoid the precipitation of condensed water. It is suitable for dry and hot areas and not suitable for the natural conditions in China. Although the IGV angle adjustment can optimize the exhaust temperature, it may cause a decrease in the compressor efficiency. Especially when the IGV angle is small, the pressure ratio and flow characteristics of the compressor will deviate from the optimal operating conditions, and the adjustable range is small. The absorption heat pump scheme can adjust the air temperature range relatively large, but the absorption heat pump has a large floor area and a large thermal inertia, and the adjustment rate is slow. Summary of the Invention

[0005] In view of the above problems existing in the above or the prior art, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a control method for regulating the inlet air temperature of a gas turbine, which can efficiently and accurately regulate the inlet air temperature of the gas turbine, while improving the energy utilization rate and reducing the operating energy consumption to meet the operating requirements of the unit under different environmental conditions.

[0007] To solve the above technical problems, the present invention provides the following technical solution: A gas turbine inlet air temperature regulation system, which includes a heat pump cycle module responsible for compressing, circulating, and heat exchanging a heat transfer medium;

[0008] A heat exchange module responsible for regulating the gas turbine inlet air, as well as discharging and heat exchanging the waste heat boiler flue gas;

[0009] A control and auxiliary module responsible for switching valves in the system and auxiliary functions.

[0010] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, among them: The heat pump cycle module includes a heat exchanger, a compressor, a circulation pump, a pressure reducing valve, and a liquid storage tank.

[0011] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, among them: The heat exchange module includes a waste heat boiler flue, and a gas turbine inlet air duct;

[0012] The waste heat boiler flue: Used to discharge the waste heat boiler flue gas and provide an installation position for the flue gas heat exchanger;

[0013] The gas turbine inlet air duct: Used to guide the flow of the gas turbine inlet air and provide an installation position for the air heat exchanger.

[0014] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, among them: The control and auxiliary module includes a filter, a bypass valve, a check valve, and a three-way valve; The three-way valve includes an inlet three-way valve and an outlet three-way valve;

[0015] The filter: Used to filter impurities in the heat transfer medium after pressure reduction;

[0016] The bypass valve: Used to bypass the pressure reducing valve, filter, and check valve when no phase change occurs;

[0017] The check valve: Used to prevent the reverse flow of the heat transfer medium;

[0018] The inlet three-way valve: Used to switch the inlet pipelines of the compressor and the circulation pump;

[0019] The outlet three-way valve: Used to switch the outlet pipelines of the compressor and the circulation pump.

[0020] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, among them: The heat exchanger includes an air heat exchanger and a flue gas heat exchanger;

[0021] The air heat exchanger: Used to conduct heat exchange with the gas turbine inlet air;

[0022] Flue gas heat exchanger: used for heat exchange with the flue gas of the waste heat boiler.

[0023] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, wherein: the inlet of the compressor and the inlet of the circulation pump are simultaneously connected to the air heat exchanger through an inlet three-way valve;

[0024] The outlet of the compressor and the outlet of the circulation pump are connected to the flue gas heat exchanger through an outlet three-way valve;

[0025] The compressor is used to pressurize and heat up the heat exchange medium;

[0026] The circulation pump is used to circulate the heat exchange medium without phase change.

[0027] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, wherein: the inlet of the pressure reducing valve is connected to the liquid storage tank, and the outlet of the pressure reducing valve is connected to the filter;

[0028] The bypass valve is connected in parallel with the pressure reducing valve, the filter, and the check valve at the same time. The inlet of the bypass valve is connected to the liquid storage tank, and the outlet of the bypass valve is connected to the air heat exchanger;

[0029] The pressure reducing valve is used to reduce the pressure of the heat exchange medium.

[0030] As a preferred embodiment of the gas turbine inlet air temperature regulation system of the present invention, wherein: the liquid storage tank is located between the pressure reducing valve and the flue gas heat exchanger, and is used to store the condensed heat exchange medium.

[0031] To solve the above technical problems, the present invention also provides the following technical solution: a control method for regulating the inlet air temperature of a gas turbine, which includes obtaining a switching signal of the real-time operation mode by real-time monitoring of the ambient and inlet temperatures;

[0032] By analyzing the flue gas waste heat parameters, obtaining the target operation parameters of the heat pump cycle module;

[0033] By optimizing the opening degree of the three-way valve through an intelligent algorithm, optimizing the heat distribution of the heat exchange medium on the air side and the flue gas side;

[0034] By dynamically adjusting the bypass valve and the pressure reducing valve, making the system pressure tend to be stable.

[0035] To solve the above technical problems, the present invention provides a computer device, including a memory and a processor, the memory stores a computer program, and is characterized in that when the processor executes the computer program, it implements the steps of the method in claim 9.

[0036] Advantages of the present invention: By adopting the dual-mode operation of a compressor and a circulation pump, the present invention can not only transfer heat from the air side to the flue gas side through phase change heat transfer, but also transfer energy from the flue gas side to the air side in a liquid form, significantly improving the flexibility and efficiency of temperature regulation. At the same time, the air heat exchanger is arranged between the compressor inlet air filter and the inlet, which can directly heat or cool the inlet air, ensuring accurate adjustment effect without affecting air quality. Moreover, the air is pre-treated through the air heat exchanger before entering the compressor, enabling adaptive air heating or cooling, ensuring that the gas turbine can maintain the optimal inlet air temperature under different working conditions, thereby improving the combustion efficiency and unit performance. At the same time, the flue gas exchanges heat with the heat pump for the second time before being discharged into the atmosphere, further recovering waste heat and reducing heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0038] Figure 1 It is a schematic external structure diagram of the gas turbine inlet air temperature regulation system.

[0039] Figure 2 It is a schematic overall structure diagram of the gas turbine inlet air temperature regulation system.

[0040] Figure 3 It is a schematic operation flow diagram of the gas turbine inlet air temperature regulation system.

[0041] Figure 4 It is a schematic diagram of the second operation flow of the gas turbine inlet air temperature regulation system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will provide a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings of the specification.

[0043] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0044] Secondly, the "one embodiment" or "embodiment" referred to herein means a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it an embodiment that is separate or selectively exclusive to other embodiments.

[0045] Embodiment 1

[0046] Referring to Figures 1 to 4 , which is the first embodiment of the present invention. This embodiment provides a gas turbine inlet air temperature regulation system, which can efficiently and accurately regulate the gas turbine inlet air temperature, while improving energy utilization efficiency and reducing operating energy consumption to meet the operating requirements of the unit under different environmental conditions.

[0047] Specifically, the heat pump cycle module 1 is responsible for the compression, circulation and heat exchange of the heat transfer medium;

[0048] The heat exchange module 2 is responsible for the regulation of the gas turbine inlet air, as well as the discharge and heat exchange of the flue gas of the waste heat boiler;

[0049] The control and auxiliary module 3 is responsible for the switching of valves and auxiliary functions in the system.

[0050] Furthermore, the heat pump cycle module 1 includes a heat exchanger 11, a compressor 12, a circulation pump 13, a pressure reducing valve 14, and a liquid storage tank 15.

[0051] Furthermore, the heat exchange module 2 includes a waste heat boiler flue 21 and a gas turbine inlet air duct 22;

[0052] The waste heat boiler flue 21: is used to discharge the flue gas of the waste heat boiler and provide an installation position for the flue gas heat exchanger 112;

[0053] The gas turbine inlet air duct 22: is used to guide the flow of the gas turbine inlet air and provide an installation position for the air heat exchanger 111.

[0054] Furthermore, the control and auxiliary module 3 includes a filter screen 31, a bypass valve 32, a check valve 33, and a three-way valve 34; the three-way valve 34 includes an inlet three-way valve 341 and an outlet three-way valve 342;

[0055] The filter screen 31: is used to filter impurities in the heat transfer medium after pressure reduction;

[0056] The bypass valve 32: is used to bypass the pressure reducing valve 14, the filter screen 31 and the check valve 33 when no phase change occurs;

[0057] The check valve 33: is used to prevent the reverse flow of the heat transfer medium;

[0058] Inlet three-way valve 341: Used to switch the inlet pipelines of the compressor 12 and the circulation pump 13;

[0059] Outlet three-way valve 342: Used to switch the outlet pipelines of the compressor 12 and the circulation pump 13.

[0060] Furthermore, the heat exchanger 11 includes an air heat exchanger 111 and a flue gas heat exchanger 112;

[0061] Air heat exchanger 111: Used to conduct heat exchange with the air at the inlet of the gas turbine;

[0062] Flue gas heat exchanger 112: Used to conduct heat exchange with the flue gas of the waste heat boiler.

[0063] Furthermore, the inlet of the compressor 12 and the inlet of the circulation pump 13 are simultaneously connected to the air heat exchanger 111 through the inlet three-way valve 341;

[0064] The outlet of the compressor 12 and the outlet of the circulation pump 13 are connected to the flue gas heat exchanger 112 through the outlet three-way valve 342;

[0065] The compressor 12 is used to pressurize and heat up the heat exchange medium;

[0066] The circulation pump 13 is used to circulate the heat exchange medium when no phase change occurs.

[0067] Furthermore, the inlet of the pressure reducing valve 14 is connected to the liquid storage tank 15, and the outlet of the pressure reducing valve 14 is connected to the filter screen 31;

[0068] The bypass valve 32 is connected in parallel with the pressure reducing valve 14, the filter screen 31, and the check valve 33 at the same time. The inlet of the bypass valve 32 is connected to the liquid storage tank 15, and the outlet of the bypass valve 32 is connected to the air heat exchanger 111;

[0069] The pressure reducing valve 14 is used to reduce the pressure of the heat exchange medium.

[0070] Furthermore, the liquid storage tank 15 is located between the pressure reducing valve 14 and the flue gas heat exchanger 112, and is used to store the condensed heat exchange medium.

[0071] It should be noted that the heat pump cycle module 1 has two working modes with the compressor 12 and the circulation pump 13 as the main circulation power respectively.

[0072] The operating principle of this system is as follows: When the ambient temperature is relatively high, the heat pump cycle module 1 uses the compressor 12 as the main circulating power. When the compressor 12 operates, the circulating pump 13 stops operating and the corresponding pipeline is closed. The heat transfer medium is stored in the air heat exchanger 111 in liquid form. At this time, the heat transfer medium liquid in the air heat exchanger 111 absorbs heat from the flowing air in the gas turbine inlet air duct 22 and undergoes vaporization phase change during the heat absorption process, evaporating into a gas state. It enters the compressor 12 in the form of steam through the inlet three-way valve 341. Further, under the compression of the compressor 12, the pressure and temperature of the heat transfer medium steam increase and enter the flue gas heat exchanger 112 through the outlet three-way valve 342. In the flue gas heat exchanger 112, the heat transfer medium steam releases heat to the flowing flue gas in the waste heat boiler flue 21 and undergoes liquefaction phase change, condensing into a liquid state, entering the liquid storage tank 15 for pressure stabilization. When the heat transfer medium is pressure-stabilized, it returns to the air heat exchanger 111 in liquid state again after reducing pressure and temperature through the pressure reducing valve 14. The pressure reducing valve 14 controls its temperature to be lower than the saturation temperature at the corresponding pressure. After reducing pressure and temperature, the heat transfer medium still returns to the air heat exchanger 111 in liquid form to absorb heat again, completing the cycle, thereby reducing the gas turbine inlet air temperature.

[0073] When the ambient temperature is relatively low, the heat pump cycle module 1 uses the circulating pump 13 as the main circulating power. When the circulating pump 13 operates, the compressor 12 stops operating and the corresponding pipeline is closed. The heat transfer medium is stored in the air heat exchanger 111 in liquid form, and releases heat to the flowing air in the gas turbine inlet air duct 22 in the air heat exchanger 111. Further, the heat transfer medium enters the circulating pump 13 in liquid form through the inlet three-way valve 341. The circulating pump 13 provides a flow head for the heat transfer medium, pushing the heat transfer medium liquid to enter the flue gas heat exchanger 112 through the outlet three-way valve 342. After absorbing heat from the flowing flue gas in the waste heat boiler flue 21 in the flue gas heat exchanger 112, it enters the liquid storage tank 15 for pressure stabilization; the pressure-stabilized heat transfer medium liquid returns to the air heat exchanger 111 through the bypass valve 32 to release heat again, completing the cycle, thereby increasing the gas turbine inlet air temperature; during the cycle, the heat transfer medium always exists in liquid form and does not undergo phase change.

[0074] In summary, by adopting the dual-mode operation of the compressor 12 and the circulation pump 13, the present invention can not only transfer heat from the air side to the flue gas side through phase change heat transfer, but also transfer energy from the flue gas side to the air side in a liquid form, significantly improving the flexibility and efficiency of temperature regulation. At the same time, the air heat exchanger 111 is arranged between the compressor air inlet filter 31 and the inlet, which can directly heat or cool the inlet air, ensuring accurate adjustment effect without affecting air quality. And the air is pre-treated by the air heat exchanger 111 before entering the compressor, which can realize adaptive air heating or cooling, ensuring that the gas turbine can maintain the optimal inlet air temperature under different working conditions, thereby improving the combustion efficiency and unit performance. At the same time, the flue gas exchanges heat with the heat pump for the second time before being discharged to the atmosphere, further recovering waste heat and reducing heat loss.

[0075] Embodiment 2

[0076] This embodiment is the second embodiment of the present invention, which provides a control method for regulating the inlet air temperature of a gas turbine, which can efficiently and accurately regulate the inlet air temperature of the gas turbine, while improving energy utilization efficiency and reducing operating energy consumption to meet the operating requirements of the unit under different environmental conditions.

[0077] Specifically, it includes obtaining a switching signal for the real-time operating mode by monitoring the environment and inlet temperature in real time;

[0078] It should be noted that by installing temperature sensors at the inlet of the gas turbine and in the environment, the inlet air temperature and the environmental temperature are monitored in real time, and the temperature data is transmitted to the control center, that is, the computer. The computer judges whether the current working condition needs to switch the operating mode of the compressor or the circulation pump according to the preset temperature threshold and operating strategy, so as to obtain the optimal operating mode switching signal.

[0079] Among them, the operating strategy includes,

[0080] Setting of temperature threshold, specifically:

[0081] High temperature threshold, when the environmental temperature or the inlet air temperature of the gas turbine exceeds the set high temperature threshold, the system switches to the cooling mode, starts the compressor, and uses phase change refrigeration to reduce the inlet air temperature.

[0082] Low temperature threshold, when the environmental temperature or the inlet air temperature of the gas turbine is lower than the set low temperature threshold, the system switches to the heating mode, starts the circulation pump, and uses the waste heat of the waste heat boiler to heat the inlet air.

[0083] Seasonal operation strategy, specifically:

[0084] In the high temperature season, the cooling mode is preferentially adopted, and the heat is transferred from the air side to the flue gas side through the compressor, and the waste heat of the waste heat boiler is used as the heat source of the heat pump to improve the cooling efficiency of the system.

[0085] In the low-temperature season, the heating mode is preferentially adopted, and the waste heat of the waste heat boiler is transferred to the air side through a circulating pump to increase the inlet air temperature of the gas turbine while meeting the heating demand.

[0086] Energy-saving priority strategy, specifically:

[0087] Priority is given to waste heat utilization. On the premise of meeting the temperature regulation requirements, the flue gas waste heat of the waste heat boiler is preferentially utilized to reduce the consumption of external energy.

[0088] Dynamically adjust the power. According to the actual temperature demand, dynamically adjust the operating power of the compressor and the circulating pump to avoid energy waste caused by over-operation.

[0089] Environmental adaptability strategy, specifically:

[0090] Humidity and humidity compensation. In a high-humidity environment, adjust the operating parameters of the cooling mode to avoid a decrease in cooling efficiency caused by high air humidity.

[0091] Response to extreme weather. In extreme high-temperature or low-temperature weather, adjust the operating strategy to ensure the stability and reliability of the system under extreme working conditions.

[0092] By analyzing the flue gas waste heat parameters, the target operating parameters of the heat pump cycle module are obtained;

[0093] It should be noted that by installing temperature and flow sensors in the flue of the waste heat boiler, the temperature and flow of the flue gas are monitored in real time to obtain the relevant parameters of the flue gas waste heat, and the relevant parameters are transmitted to the computer. The computer calculates the target operating parameters (such as compressor speed, circulating pump flow, etc.) of the heat pump cycle module based on these parameters and the inlet air temperature demand of the gas turbine to achieve efficient heat recovery and temperature regulation.

[0094] Optimize the opening degree of the three-way valve through intelligent algorithms to optimize the heat distribution of the heat transfer medium on the air side and the flue gas side;

[0095] It should be noted that through the optimization algorithm built into the computer, analyze the current temperature data and operating mode to obtain the optimal opening degree command of the three-way valve. The system automatically adjusts the opening degrees of the inlet three-way valve and the outlet three-way valve to accurately control the flow distribution of the heat transfer medium on the air side and the flue gas side, so as to obtain an ideal heat transfer effect and ensure the stability of the inlet air temperature of the gas turbine.

[0096] Among them, the optimization algorithm includes the following steps

[0097] Data collection and preprocessing:

[0098] Collect data such as the inlet air temperature, ambient temperature, flue gas temperature, inlet and outlet temperatures and pressures of the heat exchange medium of the gas turbine in real time;

[0099] Filter and denoise the collected data to ensure the accuracy and reliability of the data.

[0100] Establish a system model:

[0101] Thermal balance model: According to the principles of thermodynamics, establish the heat balance equations for the air side and the flue gas side.

[0102]

[0103] Among them, Q is the heat, C p is the specific heat capacity, is the mass flow rate, and T is the temperature.

[0104] Define the optimization objective function:

[0105] Objective function: Minimize the deviation between the inlet air temperature of the gas turbine and the target temperature, while considering the system energy consumption.

[0106] minJ = α × (T 空气,实际 - T 空气,目标 ) 2 + β × P 能耗

[0107] Among them, α and β are weight coefficients, and P 能耗 is the system operation energy consumption.

[0108] Select an optimization algorithm

[0109] Adopt the PID control algorithm or the model predictive control (MPC) algorithm;

[0110] PID control is suitable for real-time feedback control, and adjusts the opening of the three-way valve through the proportional, integral and differential terms.

[0111]

[0112] Among them, e is the error (the difference between the target temperature and the actual temperature), and K p , K i , K d are the parameters of the PID controller.

[0113] Real-time adjustment and feedback:

[0114] According to the opening command of the three-way valve calculated by the optimization algorithm, adjust the openings of the inlet three-way valve and the outlet three-way valve in real time;

[0115] Feed back the adjusted system operation data to the optimization algorithm to dynamically correct the model parameters and control strategies.

[0116] By dynamically adjusting the bypass valve and the pressure reducing valve, the system pressure tends to be stable.

[0117] It should be noted that by real-time monitoring the pressure and flow rate of the heat exchange medium, the computer dynamically adjusts the opening degrees of the bypass valve and the pressure reducing valve. During the operation of the system, according to the state and requirements of the heat exchange medium, the bypass valve can bypass the pressure reducing valve and the filter, and the pressure reducing valve is used to precisely control the medium pressure, so as to obtain a stable system pressure and ensure the safe and efficient operation of the heat pump circulation module.

[0118] In summary, by adopting the dual-mode operation of the compressor and the circulation pump, the present invention can not only transfer heat from the air side to the flue gas side through phase change heat transfer, but also transfer energy from the flue gas side to the air side in a liquid form, significantly improving the flexibility and efficiency of temperature regulation; at the same time, the air heat exchanger is arranged between the compressor air intake filter and the inlet, which can directly heat or cool the inlet air, ensuring accurate adjustment effect and not affecting the air quality; and the air is pre-treated through the air heat exchanger before entering the compressor, which can realize adaptive air heating or cooling, ensuring that the gas turbine can maintain the optimal intake air temperature under different working conditions, thereby improving the combustion efficiency and unit performance. At the same time, the flue gas exchanges heat with the heat pump for the second time before being discharged to the atmosphere, further recovering the waste heat and reducing the heat loss.

[0119] Embodiment 3

[0120] This embodiment provides a computer device, which can be a terminal, and its internal structure diagram can be as Figure 3 shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a carrier network, NFC (Near Field Communication) or other technologies. When the computer program is executed by the processor, it realizes a method and system for online independent drive test of a target solenoid valve in a thermal power plant. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a button, a trackball or a touchpad set on the computer device shell, or an external keyboard, a touchpad or a mouse, etc.

[0121] This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes: constructing and training a target network model, where the target network model includes an edge extraction sub-module, a dynamic selection sub-module, a feature extraction sub-module, and an image enhancement sub-module; processing a degraded underground cable X-ray image through the target network model and generating a fused feature map; inputting the fused feature map into the image enhancement sub-module to generate an enhanced underground cable X-ray image.

[0122] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A gas turbine inlet air temperature control system, characterized in that: include, The heat pump circulation module (1) is responsible for the compression, circulation and heat exchange of the heat exchange medium; The heat exchange module (2) is responsible for regulating the inlet air of the gas turbine and the exhaust and heat exchange of the flue gas of the waste heat boiler; The control and auxiliary module (3) is responsible for the switching and auxiliary functions of the valves in the system.

2. The gas turbine inlet air temperature control system according to claim 1, characterized in that: The heat pump circulation module (1) comprises a heat exchanger (11), a compressor (12), a circulation pump (13), a pressure reducing valve (14), and a liquid storage tank (15).

3. The gas turbine inlet air temperature control system according to claim 2, characterized in that: The heat exchange module (2) comprises a waste heat boiler flue (21) and a gas turbine inlet air duct (22); The waste heat boiler flue (21) is used to discharge the flue gas of the waste heat boiler and provide an installation position for the flue gas heat exchanger (112); Gas turbine inlet air duct (22): used to guide the flow of gas turbine inlet air and provide an installation position for the air heat exchanger (111).

4. The gas turbine inlet air temperature control system according to claim 3, characterized in that: The control and auxiliary module (3) comprises a filter (31), a bypass valve (32), a check valve (33), and a three-way valve (34); the three-way valve (34) comprises an inlet three-way valve (341) and an outlet three-way valve (342); The filter (31) is used to filter impurities in the heat exchange medium after decompression; The bypass valve (32) is used to bypass the pressure reducing valve (14), the filter (31) and the check valve (33) when no phase change occurs; The check valve (33) is used to prevent the heat exchange medium from flowing back; The inlet three-way valve (341) is used to switch the inlet pipelines of the compressor (12) and the circulation pump (13); The outlet three-way valve (342) is used to switch the outlet pipelines of the compressor (12) and the circulation pump (13).

5. The gas turbine inlet air temperature control system according to claim 4, characterized in that: The heat exchanger (11) comprises an air heat exchanger (111) and a flue gas heat exchanger (112); The air heat exchanger (111) is used to perform heat exchange with the gas turbine inlet air; The flue gas heat exchanger (112) is used to perform heat exchange with the flue gas of the waste heat boiler.

6. The gas turbine inlet air temperature control system according to claim 5, characterized in that: The inlet of the compressor (12) and the inlet of the circulation pump (13) are simultaneously connected to the air heat exchanger (111) through the inlet three-way valve (341); The outlet of the compressor (12) and the outlet of the circulation pump (13) are connected to the flue gas heat exchanger (112) via the outlet three-way valve (342); The compressor (12) is used to pressurize and increase the temperature of the heat exchange medium; The circulation pump (13) is used to circulate the heat exchange medium when no phase change occurs.

7. The gas turbine inlet air temperature control system according to any one of claims 5 or 6, characterized in that: The inlet of the pressure reducing valve (14) is connected to the liquid storage tank (15), and the outlet of the pressure reducing valve (14) is connected to the filter screen (31); The bypass valve (32) is connected in parallel with the pressure reducing valve (14), the filter (31), and the check valve (33); the inlet of the bypass valve (32) is connected to the liquid storage tank (15), and the outlet of the bypass valve (32) is connected to the air heat exchanger (111); The pressure reducing valve (14) is used to reduce the pressure of the heat exchange medium.

8. The gas turbine inlet air temperature control system according to claim 7, characterized in that: The liquid storage tank (15) is located between the pressure reducing valve (14) and the flue gas heat exchanger (112), and is used to store condensed heat exchange medium.

9. A control method for regulating the inlet air temperature of a gas turbine, based on the above-mentioned inlet air temperature regulation system of a gas turbine, characterized in that: include, By real-time monitoring of the environment and inlet temperature, a real-time operating mode switching signal is obtained; By analyzing the flue gas waste heat parameters, the target operating parameters of the heat pump circulation module (1) are obtained; The opening of the three-way valve (34) is optimized by an intelligent algorithm to optimize the heat distribution of the heat exchange medium on the air side and the flue gas side; By dynamically adjusting the bypass valve (32) and the pressure reducing valve (14), the system pressure is stabilized.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method described in claim 9 are implemented.

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