Fuel oil system of gas turbine and gas turbine

Abstract

The utility model discloses a fuel oil system of a gas turbine and the gas turbine, and belongs to the technical field of gas turbines.The fuel oil system comprises an ignition oil way, a working oil way and a return and drainage oil way, and the ignition oil way is used for communicating a fuel oil tank with an ignition nozzle of the gas turbine; the working oil way is used for communicating a fuel tank with a working nozzle of the gas turbine, the fuel tank is connected with the main fuel pump through the auxiliary fuel pump, an outlet of the main fuel pump is connected to an inlet of the fuel adjusting valve, a bypass port of the fuel adjusting valve is connected to the front end of the main fuel pump, and the quick cut-off valve is used for cutting off the working oil way; an inlet of the return oil way is connected with an oil way between the fuel regulating valve and the quick cut-off valve, and an outlet of the return oil way is connected with the fuel tank. The industrial fuel control valve is adopted, the cost is reduced, the purchasing period is shortened, meanwhile, the rapid cut-off valve is arranged, rapid cut-off of an oil way can be achieved during emergency shutdown, and the phenomenon that tail gas emission does not reach the standard is avoided.

Description

Technical Field

[0001] This application relates to the field of gas turbine technology, and in particular, to a fuel system for a gas turbine and a gas turbine itself. Furthermore, this application also relates to a gas turbine including the aforementioned fuel system. Background Technology

[0002] The information provided in this section is for the purpose of generally presenting the background of this application. To the extent described in this section, the work of the currently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly considered to be prior art of this application.

[0003] Currently, the fuel system used in gas turbine generator sets typically involves fuel flowing from an electric booster pump to an auxiliary fuel pump. One outlet of the auxiliary fuel pump connects to the main fuel pump. The high-pressure fuel from the main fuel pump enters the fuel control valve, which is integrated into the gas turbine and is a dedicated engine device. The fuel at the outlet of the fuel control valve enters the gas turbine. The bypass port of the fuel control valve connects to the main fuel pump. Another path from the auxiliary fuel pump connects to the gas turbine starting valve, which is also integrated into the gas turbine and is a dedicated engine device.

[0004] For example, Chinese Patent Publication No. CN117738796A discloses a liquid fuel system, control method, medium, and equipment for a gas turbine, including: a fuel tank, a main oil circuit, a surge oil circuit, a mixing oil circuit, and a liquid fuel annular manifold; the inlet of the main oil circuit is connected to the fuel tank, and the outlet of the main oil circuit is connected to the inlet of the mixing oil circuit; the inlet of the surge oil circuit is connected to the fuel tank, and the outlet of the surge oil circuit is connected to the inlet of the mixing oil circuit; the surge oil circuit is equipped with a booster pump; the outlet of the mixing oil circuit is connected to the inlet of the annular manifold. This scheme sets up a main oil circuit and a surge oil circuit, and installs a booster pump in the surge oil circuit. When the gas turbine starts up, and when switching from gaseous fuel to liquid fuel, the main oil circuit and the surge oil circuit supply oil to the liquid fuel annular manifold, which can shorten the time for the liquid fuel to fill the liquid fuel annular manifold and reduce the time difference of liquid fuel injection into each nozzle.

[0005] However, the existing fuel system still has the following drawbacks: 1. The flow rate of the electric booster pump needs to meet the system requirements, and the motor is generally AC, which is not suitable for emergency units, which do not have AC power supply; 2. The fuel control valve and starting valve are engine-specific equipment, with long procurement cycles and high prices. For civilian gas turbine units, they lack market competitiveness, and the original fuel control valve is not easy to achieve automatic control; 3. When the system shuts down in an emergency, the fuel circuit is not cut off quickly enough, resulting in exhaust emissions that do not meet standards. Utility Model Content

[0006] In view of at least one of the above technical problems, this application provides a fuel system for a gas turbine that can reduce costs and procurement cycles by using an industrial fuel control valve, and at the same time, it is equipped with a quick-shut-off valve that can quickly cut off the fuel circuit in case of emergency shutdown, thereby avoiding phenomena such as non-compliance with exhaust emission standards.

[0007] This application also provides a gas turbine that includes the fuel system of the aforementioned gas turbine.

[0008] According to one aspect of this application, a fuel system for a gas turbine is provided, comprising a fuel tank, an ignition fuel line, a working fuel line, and a return fuel line. The ignition fuel line connects the fuel tank to the ignition nozzle of the gas turbine, and an electric pump and an ignition solenoid valve are sequentially arranged on the ignition fuel line. The ignition fuel line is connected to the working fuel line, which connects the fuel tank to the working nozzle of the gas turbine. An auxiliary fuel pump, a main fuel pump, a fuel control valve, and a quick-cut-off valve are sequentially arranged on the working fuel line. The bypass port of the fuel control valve is connected to the front end of the main fuel pump, and the quick-cut-off valve is used to cut off the working fuel line. The inlet of the return fuel line is connected to the fuel line between the fuel control valve and the quick-cut-off valve, and the outlet of the return fuel line is connected to the fuel tank.

[0009] In some embodiments of this application, the first outlet of the auxiliary fuel pump is connected to the main fuel pump, a branch of the electric pump is connected to the second outlet of the auxiliary fuel pump, and a one-way valve is provided on the branch of the electric pump. The outlet of the main fuel pump is connected to the inlet of the fuel regulating valve, and the bypass port of the fuel regulating valve is connected to the inlet of the main fuel pump.

[0010] In some embodiments of this application, the fuel system of the gas turbine further includes a sludge discharge line, which connects the gas turbine sludge discharge port of the gas turbine to the sludge discharge tank, and the third outlet of the auxiliary fuel pump is also connected to the sludge discharge line.

[0011] In some embodiments of this application, the fuel system of the gas turbine further includes a fuel filter disposed between the main fuel pump and the fuel control valve.

[0012] In some embodiments of this application, a first pressure sensor, a first flow sensor, and a first temperature sensor are provided between the fuel filter and the fuel control valve.

[0013] In some embodiments of this application, a second pressure sensor, a second flow sensor, and a second temperature sensor are provided between the quick-shut-off valve and the working nozzle.

[0014] In some embodiments of this application, a discharge valve is provided on the return oil line.

[0015] In some embodiments of this application, the discharge valve is a fail-open type.

[0016] In some embodiments of this application, the electric pump is a DC electric pump.

[0017] According to another aspect of this application, a gas turbine is also provided, which includes the fuel system of the aforementioned gas turbine.

[0018] This application has the following beneficial effects:

[0019] The fuel system of this gas turbine connects the fuel tank to the ignition nozzle and the working nozzle of the gas turbine via an ignition fuel line and a working fuel line, respectively. The ignition fuel line includes an electric pump, an ignition solenoid valve, and an ignition nozzle in sequence. The working fuel line includes a fuel tank, an auxiliary fuel pump, a main fuel pump, a fuel control valve, and a quick-shutdown valve in sequence. A branch of the electric pump is connected to the outlet of the auxiliary fuel pump, and a one-way valve is installed on the pipeline. The quick-shutdown valve enables rapid shut-off of the working fuel line in case of emergency shutdown, preventing issues such as substandard exhaust emissions and providing effective safety assurance. Furthermore, a separate fuel control valve is provided on the working fuel line, eliminating the use of the engine-specific mechanical hydraulic valve integrated into the gas turbine. Instead, an easily procurable industrial fuel control valve is used, significantly reducing procurement time and difficulty, lowering procurement and maintenance costs, and facilitating control of the working fuel line. Additionally, this application incorporates a return fuel line to return fuel from the working fuel line before the quick-shutdown valve to the fuel tank, achieving a return fuel function and serving as an emergency return fuel line in conjunction with the quick-shutdown valve.

[0020] The gas turbine in this application also possesses the aforementioned beneficial effects. It also reduces the number of valve components such as the fuel control valve and starting valve integrated into the gas turbine, effectively shortening the procurement cycle and cost of engine-specific valve equipment. Furthermore, the electric pump uses a DC electric pump, enabling DC power supply and adaptability to emergency DC power supply, which improves the adaptability of the fuel system. In addition to meeting the requirements of the starting pipeline, the electric pump's flow parameters employ a redundant design, with the redundant flow boosting the auxiliary fuel pump outlet pipeline. This electric pump features low flow rate and small size, effectively reducing procurement costs.

[0021] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above simultaneously. In addition to the purposes, features, and advantages described above, this application also has other purposes, features, and advantages. The application will be further described in detail below with reference to figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of the hydraulic system according to a preferred embodiment of this application.

[0024] Legend: 100, Main fuel pump; 200, Auxiliary fuel pump; 300, Fuel tank; 400, Fuel filter; 500, Fuel control valve; 600, Quick shut-off valve; 700, Exhaust valve; 800, Sewage tank; 900, Ignition nozzle; 1000, Working nozzle; 1100, Gas turbine exhaust port; 1200, Electric pump; 1300, Ignition solenoid valve. Detailed Implementation

[0025] The embodiments of this application are described in detail below with reference to the accompanying drawings; however, this application may be implemented in a variety of different ways as defined and covered below.

[0026] Figure 1 This is a schematic diagram of the overall structure of the hydraulic system according to a preferred embodiment of this application.

[0027] A fuel system for a gas turbine includes a fuel tank 300, an ignition fuel line, a working fuel line, and a return fuel line. The ignition fuel line connects the fuel tank 300 to an ignition nozzle 900 of the gas turbine. An electric pump 1200 and an ignition solenoid valve are sequentially installed on the ignition fuel line. The ignition fuel line is connected to the working fuel line, which connects the fuel tank 300 to the working nozzle 1000 of the gas turbine. An auxiliary fuel pump 200, a main fuel pump 100, a fuel control valve 500, and a quick-cut-off valve 600 are sequentially installed on the working fuel line. The bypass port of the fuel control valve 500 is connected to the front end of the main fuel pump 100, and the quick-cut-off valve 600 is used to cut off the working fuel line. The inlet of the return fuel line is connected to the fuel line between the fuel control valve 500 and the quick-cut-off valve 600, and the outlet of the return fuel line is connected to the fuel tank 300.

[0028] Here, "fuel regulating valve 500" refers to a valve connected to the outlet of the main fuel pump 100. In the preferred embodiment of this application, the fuel regulating valve 500 is an industrially available fuel regulating valve 500 that is easy to procure. This eliminates the need for the dedicated engine fuel regulating valve that is typically attached to the gas turbine's fuel system, significantly reducing procurement time and costs. It also facilitates the implementation of automatic fuel circuit control and makes maintenance and replacement easier. The fuel regulating valve 500 effectively regulates fuel pressure in the working fuel circuit, buffers pressure pulses, and maintains stable pressure. It also effectively protects the gas turbine's fuel system, saves fuel, reduces carbon deposits, and ultimately improves engine performance.

[0029] The fuel system of the gas turbine in this application connects the fuel tank 300 to the ignition nozzle 900 and the working nozzle 1000 of the gas turbine via an ignition fuel line and a working fuel line, respectively. The ignition fuel line is provided with an electric pump 1200, an ignition solenoid valve, and an ignition nozzle 900 in sequence. The working fuel line is provided with a fuel tank 300, an auxiliary fuel pump 200, a main fuel pump 100, a fuel control valve 500, and a quick-cut-off valve 600 in sequence. A branch of the electric pump 1200 is connected to the outlet of the auxiliary fuel pump 200, and a one-way valve is installed on the branch pipeline. The quick-cut-off valve 600 can quickly cut off the working fuel line in case of emergency shutdown, avoiding phenomena such as failure to meet exhaust emission standards, and providing effective safety protection. Furthermore, a separate fuel control valve 500 is installed on the working oil circuit, replacing the mechanical hydraulic valves dedicated to the gas turbine engine. Instead, readily available industrial fuel control valves are used, significantly reducing procurement time and difficulty, thus lowering procurement and maintenance costs. This also allows for easier control of the working oil circuit. Additionally, this application incorporates a return oil circuit to return oil from the working oil circuit before the quick-cutoff valve 600 to the fuel tank 300, achieving a return oil function. This, in conjunction with the quick-cutoff valve 600, also serves as an emergency return oil circuit.

[0030] Preferably, please refer to Figure 1 As shown, the first outlet of the auxiliary fuel pump 200 is connected to the main fuel pump 100, the branch of the electric pump 1200 is connected to the second outlet of the auxiliary fuel pump 200, and a one-way valve is provided on the branch of the electric pump 1200. The outlet of the main fuel pump is connected to the inlet of the fuel regulating valve, and the bypass port of the fuel regulating valve 500 is connected to the inlet of the main fuel pump.

[0031] Understandably, the auxiliary fuel pump 200 can achieve multiple functions. Specifically, the first outlet of the auxiliary fuel pump 200 is connected to the main fuel pump 100, and the second outlet is connected to the ignition line. This helps maintain the overall pressure of the fuel system, providing pressure to the fuel system before engine start-up to ensure smooth starting. Furthermore, when the engine is under low load or idling, where the auxiliary and main fuel pumps 100 may not provide sufficient fuel pressure, the starting electric pump 1200 provides stable fuel pressure to ensure the engine's fuel needs are met. Additionally, the electric pump 1200 and auxiliary fuel pump 200 can improve the reliability and safety of the fuel system, achieving functions such as adequate fuel supply.

[0032] To address the issue of dry running-in of the auxiliary fuel pump 200 before startup, this application connects a branch of the electric pump 1200 to the auxiliary fuel pump 200. This ensures the auxiliary fuel pump 200 is fully fueled before startup, effectively preventing dry running-in and significantly extending the service life of components. Specifically, the first outlet of the auxiliary fuel pump 200 is connected to the main fuel pump 100, and the second outlet of the auxiliary fuel pump 200 is connected to the ignition fuel line.

[0033] Preferably, please refer to Figure 1 As shown, the fuel system of the gas turbine also includes a sludge discharge line, which connects the gas turbine sludge discharge port 1100 of the gas turbine to the sludge discharge tank 800. The third outlet of the auxiliary fuel pump 200 is also connected to the sludge discharge line.

[0034] Understandably, the gas turbine's fuel system, through its sludge drain line, enables the turbine to discharge accumulated pollutants and impurities, including moisture, sediment, and other contaminants, preventing them from entering nozzles and other working components and ensuring the long-term stable operation of the gas turbine. Regular cleaning of the sludge drain line also prevents blockages, ensuring a smooth fuel supply. Furthermore, the sludge drain line helps maintain stable fuel system pressure, preventing excessively high or low pressure from affecting fuel supply and combustion efficiency. It also prevents fuel leakage into inappropriate areas, ensuring safe start-up and operation of the gas turbine and reducing the risk of malfunctions.

[0035] Preferably, please refer to Figure 1 As shown, the fuel system of the gas turbine also includes a fuel filter 400, which is disposed between the main fuel pump 100 and the fuel regulating valve 500.

[0036] Understandably, by installing a fuel filter 400 in the working oil circuit, positioned between the main fuel pump 100 and the fuel control valve 500, the fuel in the working oil circuit is effectively filtered, protecting the fuel control valve 500 and providing effective protection for the entire fuel system. The fuel filter 400 filters out fixed particles, moisture, sludge, and other impurities from the fuel, preventing these impurities from entering components such as nozzles and the combustion chamber. This avoids the accumulation of impurities affecting the normal operation of the fuel system, reduces wear on precision components in the fuel system, prevents nozzle blockage, and protects fuel pumps and control valves. Furthermore, the improved fuel purity through the fuel filter 400 helps ensure complete combustion, improves the thermal efficiency of the gas turbine, reduces fuel consumption, and decreases pollution emissions.

[0037] Preferably, please refer to Figure 1As shown, a first pressure sensor, a first flow sensor, and a first temperature sensor are provided between the fuel filter 400 and the fuel control valve 500.

[0038] Understandably, the first pressure sensor, first flow sensor, and first temperature sensor can monitor the fuel pressure, flow rate, and temperature before the fuel regulating valve 500 in real time, providing timely reference for the control of the fuel regulating valve 500. This is conducive to the stable realization of the control function of the fuel regulating valve 500 and ensures the safety and reliability of the fuel system.

[0039] Preferably, please refer to Figure 1 As shown, a second pressure sensor, a second flow sensor, and a second temperature sensor are provided between the quick-cut-off valve 600 and the working nozzle 1000.

[0040] Understandably, by using the second pressure sensor, second flow sensor, and second temperature sensor to monitor key parameters of the fuel entering the working nozzle 1000 in real time, the quick-cut-off valve 600 can react promptly and implement cut-off control in the event of any abnormalities in the working oil circuit, preventing accidents from occurring or escalating. Specifically, in the event of gas leakage, overheating, or overpressure, the quick-cut-off valve 600 will respond promptly and quickly cut off the fuel supply, protecting the gas turbine equipment and personnel safety.

[0041] Preferably, please refer to Figure 1 As shown, a drain valve 700 is installed on the return oil line.

[0042] Understandably, the exhaust valve 700 controls and regulates fuel discharge from the return oil circuit, ensuring the safety and normal operation of the fuel system. Specifically, the exhaust valve 700 discharges excess fuel during gas turbine startup, shutdown, or operation, preventing fuel accumulation in the fuel system and avoiding equipment damage due to excessive fuel pressure. In emergency situations, the exhaust valve 700 can also quickly discharge fuel, providing emergency relief and protecting equipment and personnel. Furthermore, the exhaust valve 700 removes impurities and contaminants from the fuel, maintaining the cleanliness of the fuel system and preventing excessive impurities from affecting components, thus enhancing system cleanliness.

[0043] Preferably, please refer to Figure 1 As shown, the discharge valve 700 is a fault-open type.

[0044] It is understandable that selecting the existing fault-opening type drain valve 700 can serve as an emergency shut-off valve for the return oil circuit, preventing accidents from occurring or escalating, protecting the safety of equipment and personnel, or facilitating the maintenance of the return oil circuit pipeline or its components.

[0045] Preferably, please refer to Figure 1As shown, the electric pump 1200 is a DC electric pump.

[0046] Understandably, since the electric pump 1200 in this application only needs to meet the flow requirements of the ignition oil circuit and has a small flow rate, a DC electric pump 1200 can meet the requirements. The corresponding system can use DC power supply, which can adapt to the matching needs of emergency units (which do not have AC power supply). Specifically, using a DC automotive electric pump 1200 helps reduce procurement and subsequent maintenance and replacement costs.

[0047] It should be noted that the electric pump 1200 of a traditional gas turbine fuel system, as an electric booster pump, is generally AC-powered due to the need to meet system flow requirements. This makes it unsuitable for emergency units, as they lack AC power supply. In contrast, the working fuel circuit of this application operates through an auxiliary fuel pump 200 in conjunction with the main fuel pump 100. The ignition fuel circuit is designed as a separate circuit with low flow requirements, which can be met by a DC electric pump. This application features a separate DC electric pump for the ignition line, which has low flow and low pressure, uses DC power, and offers low equipment cost, easy installation, maintenance, and replacement.

[0048] According to another aspect of this application, a gas turbine is also provided, which includes the fuel system of the aforementioned gas turbine.

[0049] This application's gas turbine also possesses the aforementioned beneficial effects. It further reduces the number of valve components, such as the fuel control valve, inherent in the gas turbine, effectively lowering the procurement cycle and cost of engine-specific valve equipment. Furthermore, the electric pump 1200 uses a DC electric pump, enabling DC power supply and adaptability to emergency DC power supply, thus improving the adaptability of the fuel system. In addition to meeting the flow parameters of the starting pipeline, the electric pump 1200 employs a redundant design, with redundant flow boosting the outlet pipeline of the auxiliary fuel pump 200. This electric pump 1200 features small flow rate and compact size, effectively reducing procurement costs. This application also utilizes a quick-cutoff valve 600 to rapidly cut off fuel supply when the unit shuts down. Excess fuel is discharged through the discharge valve 700, reducing hazards and ensuring unit safety. Additionally, this application replaces the starting solenoid valve with an industrial-grade solenoid valve, resulting in a shorter equipment delivery cycle and greater market competitiveness. This avoids the need for engine-specific customized equipment for both the fuel control valve and the starting valve, which leads to long procurement cycles, high prices, and negatively impacts the market competitiveness of civilian gas turbine units.

[0050] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the method and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered as protected by this application.

Claims

1. A fuel system for a gas turbine, characterized in that, The system includes a fuel tank (300), an ignition oil circuit, a working oil circuit, and a return oil circuit. The ignition oil circuit connects the fuel tank (300) to the ignition nozzle (900) of the gas turbine. An electric pump (1200) and an ignition solenoid valve (1300) are sequentially installed on the ignition oil circuit. The ignition oil circuit is connected to the working oil circuit, which connects the fuel tank (300) to the working nozzle (1000) of the gas turbine. An auxiliary... The system includes an auxiliary fuel pump (200), a main fuel pump (100), a fuel control valve (500), and a quick-cut-off valve (600). The bypass port of the fuel control valve (500) is connected to the front end of the main fuel pump (100), and the quick-cut-off valve (600) is used to cut off the working fuel circuit. The inlet of the return fuel circuit is connected to the fuel circuit between the fuel control valve (500) and the quick-cut-off valve (600), and the outlet of the return fuel circuit is connected to the fuel tank (300).

2. The fuel system for a gas turbine according to claim 1, characterized in that, The first outlet of the auxiliary fuel pump (200) is connected to the main fuel pump (100), a branch of the electric pump (1200) is connected to the second outlet of the auxiliary fuel pump (200), and a one-way valve is provided on the branch of the electric pump (1200). The outlet of the main fuel pump is connected to the inlet of the fuel regulating valve, and the bypass port of the fuel regulating valve (500) is connected to the inlet of the main fuel pump.

3. The fuel system for a gas turbine according to claim 2, characterized in that, The fuel system of the gas turbine also includes a sludge discharge line, which connects the gas turbine sludge discharge port (1100) of the gas turbine to the sludge discharge tank (800), and the third outlet of the auxiliary fuel pump (200) is also connected to the sludge discharge line.

4. The fuel system for a gas turbine according to claim 1, characterized in that, The gas turbine's fuel system also includes a fuel filter (400) located between the main fuel pump (100) and the fuel control valve (500).

5. The fuel system for a gas turbine according to claim 4, characterized in that, A first pressure sensor, a first flow sensor, and a first temperature sensor are provided between the fuel filter (400) and the fuel control valve (500).

6. The fuel system for a gas turbine according to claim 1, characterized in that, A second pressure sensor, a second flow sensor, and a second temperature sensor are provided between the quick-shut-off valve (600) and the working nozzle (1000).

7. The fuel system for a gas turbine according to claim 1, characterized in that, A drain valve (700) is installed on the return oil line.

8. The fuel system for a gas turbine according to claim 7, characterized in that, The discharge valve (700) is a fault-open type.

9. The fuel system for a gas turbine according to claim 1, characterized in that, The electric pump (1200) is a DC electric pump.

10. A gas turbine, characterized in that, Including the fuel system of the gas turbine as described in any one of claims 1-9.

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