A gas turbine, a fuel supply system and a method thereof

Abstract

The application discloses a gas turbine, a fuel supply system and a method thereof, and relates to the technical field of gas turbines. The application comprises a gaseous fuel supply module for supplying gaseous fuel to the gas turbine; a liquid fuel supply module for supplying liquid fuel to the gas turbine; a compressed air purge module for cleaning and cooling the liquid fuel supply module; a protective gas purge module for cleaning the gaseous fuel supply module; and a compressed air purge module for cooling the gaseous fuel supply module. The application uses the protective gas purge module to clean the gaseous fuel supply module. Since the protective gas and the gaseous fuel cannot cause chemical reactions such as combustion, the gaseous fuel supply module cannot be damaged by phenomena such as combustion and explosion. After the cleaning of the protective gas purge module is completed, the compressed air purge module is used to continuously cool the protective gas purge module, and the cost is relatively low.

Description

Technical Field

[0001] This application relates to the field of gas turbine technology, specifically to a gas turbine, a fuel supply system, and a method thereof. Background Technology

[0002] A gas turbine is a rotating impeller-type thermal engine that uses a continuously flowing gas as the working fluid to drive a high-speed rotating impeller. It is an internal combustion power machine that converts the energy of fuel into useful work. Due to its advantages such as small size, fast start-up speed, portability, and high power density, gas turbines are widely used in vehicle and ship propulsion, power generation, and pipeline pressurization.

[0003] With technological advancements, dual-fuel gas turbines have emerged on the market. A dual-fuel gas turbine is a gas turbine that can use both gaseous and liquid fuels. This type of gas turbine employs dual-fuel combustion technology, which improves its fuel adaptability and broadens its application areas. However, current dual-fuel technology for gas turbines is still immature. For example, when switching from liquid to gaseous fuel, the liquid fuel remaining in the supply pipe is prone to coking and clogging the pipes or nozzles. To address this technical problem, patent publication number CN112727604A, entitled "Liquid / Gas Dual-Fuel Supply System for Gas Turbines," discloses a solution: using compressed air to purge the supply pipes and nozzles to prevent coking. However, this method is not suitable for purging the gaseous fuel supply pipe when switching from gaseous to liquid fuel, because compressed air contains oxygen, which can easily ignite and explode with the gaseous fuel in the supply pipe, damaging the supply pipe. Summary of the Invention

[0004] The purpose of this application is to provide a gas turbine, a fuel supply system and a method thereof to solve the technical problem that combustion and explosion are prone to occur when purging the gas fuel supply pipe.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application proposes a gas turbine fuel supply system, comprising: a gaseous fuel supply module for supplying gaseous fuel to a gas turbine; a liquid fuel supply module for supplying liquid fuel to a gas turbine; a compressed air purging module for cleaning and cooling the liquid fuel supply module; and a protective gas purging module for cleaning the gaseous fuel supply module.

[0007] In another embodiment of this application, the gas fuel supply module includes: a gas fuel supply device; a gas fuel supply pipe, with a first end connected to the gas fuel supply device and a second end connected to a gas fuel main pipe; a gas vent pipe, with a first end connected to the gas fuel supply pipe; a first valve assembly, used at least to control the opening and closing of the gas fuel supply pipe; and a second valve assembly, used at least to control the opening and closing of the gas vent pipe.

[0008] In another embodiment of this application, the first valve assembly includes a first control valve disposed on the gas fuel supply pipe; the second valve assembly includes a second control valve disposed on the gas vent pipe.

[0009] In another embodiment of this application, the first valve assembly further includes a first temperature sensor, a first quick-stop valve, and a second quick-stop valve disposed on the gas fuel supply pipe. The first control valve, the first temperature sensor, the first quick-stop valve, and the second quick-stop valve are arranged sequentially along a first direction, which points from the first end of the gas fuel supply pipe to the second end. The gas vent pipe is located between the first quick-stop valve and the second quick-stop valve.

[0010] In another embodiment of this application, the first valve assembly further includes a first pressure sensor, a first regulating valve, and a second pressure sensor disposed on the gas fuel supply pipe, wherein the first pressure sensor, the first regulating valve, and the second pressure sensor are arranged sequentially along a first direction.

[0011] In another embodiment of this application, the second valve assembly further includes a vent valve disposed on the gas vent pipe, the vent valve and the second control valve being arranged sequentially along a second direction, the second direction being from the first end of the gas vent pipe to the second end.

[0012] In another embodiment of this application, the protective gas purging module includes: a protective gas supply device; a protective gas supply pipe, with a first end connected to the protective gas supply device and a second end connected to the gas fuel supply pipe; and a seventh control valve disposed on the protective gas supply pipe.

[0013] In another embodiment of this application, the liquid fuel supply module includes: a liquid fuel supply device; a liquid fuel supply pipe, with a first end connected to the liquid fuel supply device and a second end connected to the liquid fuel main pipe; a third valve assembly, used at least to control the opening and closing of the liquid fuel supply pipe; and a return oil pipe assembly, used for returning oil from the liquid fuel supply pipe.

[0014] In another embodiment of this application, the third valve assembly includes a third control valve disposed on the liquid fuel supply pipe.

[0015] In another embodiment of this application, the third valve assembly further includes a fourth pressure sensor, a second regulating valve, and a fifth pressure sensor disposed on the liquid fuel supply pipe. The third control valve, the fourth pressure sensor, the second regulating valve, and the fifth pressure sensor are arranged sequentially along a third direction, which points from the first end of the liquid fuel supply pipe to the second end.

[0016] In another embodiment of this application, the third valve assembly further includes a fourth quick-stop valve and a fifth quick-stop valve disposed on the liquid fuel supply pipe, wherein the fourth quick-stop valve, the second regulating valve and the fifth quick-stop valve are arranged sequentially along a third direction.

[0017] In another embodiment of this application, the third valve assembly further includes a second temperature sensor and a third pressure sensor disposed on the liquid fuel supply pipe, wherein the third control valve, the second temperature sensor, the third pressure sensor, the fourth quick-closing valve, the fourth pressure sensor, the second regulating valve, the fifth quick-closing valve, and the fifth pressure sensor are arranged sequentially along a third direction.

[0018] In another embodiment of this application, the return oil pipe assembly includes a first return oil pipe, a second return oil pipe, and a third return oil pipe, wherein the first return oil pipe is located between the fourth quick-stop valve and the fourth pressure sensor; the second return oil pipe is located between the second regulating valve and the fifth quick-stop valve; and the third return oil pipe is located between the fifth quick-stop valve and the fifth pressure sensor.

[0019] In another embodiment of this application, the compressed air purging module includes: a compressed air supply device; a compressed air supply pipe, with a first end connected to the compressed air supply device and a second end extending into a first branch pipe and a second branch pipe, wherein the first branch pipe is used to connect to the gaseous fuel supply pipe; the second branch pipe is used to connect to the liquid fuel supply pipe; and a fourth valve assembly, at least used to control the opening and closing of the compressed air supply pipe, the first branch pipe, and the second branch pipe.

[0020] In another embodiment of this application, the fourth valve assembly includes: a fourth control valve disposed on the compressed air supply pipe; a fifth control valve disposed on the first branch pipe; and a sixth control valve disposed on the second branch pipe.

[0021] In another embodiment of this application, the fourth valve assembly further includes a third regulating valve disposed on the compressed air supply pipe.

[0022] In another embodiment of this application, the fourth valve assembly further includes a sixth pressure sensor and a first check valve disposed on the first branch pipe, wherein the fifth control valve, the sixth pressure sensor and the first check valve are arranged sequentially along the airflow direction in the first branch pipe; and / or, a seventh pressure sensor and a second check valve disposed on the second branch pipe, wherein the sixth control valve, the seventh pressure sensor and the second check valve are arranged sequentially along the airflow direction in the second branch pipe.

[0023] Secondly, this application also proposes a gas turbine having a gas turbine fuel supply system as described in any one of the first aspects.

[0024] Thirdly, this application also provides a gas turbine fuel supply method, applied to a gas turbine fuel supply system as described in any of the first aspects, the method comprising: cleaning a gas fuel supply module based on a protective gas purging module.

[0025] Compared with the prior art, the beneficial effects of this application are:

[0026] This application employs a protective gas purging module to clean the gas fuel supply module. Since the protective gas and gas fuel do not undergo combustion or other chemical reactions, no explosions or other phenomena that could damage the gas fuel supply module will occur. Furthermore, after the protective gas purging module is cleaned, a compressed air purging module is used to continuously cool it. The cost of obtaining compressed air is relatively lower than the cost of obtaining protective gas, thus saving on operating costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the gas turbine fuel supply system proposed in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the piping structure of the gas turbine fuel supply system proposed in the embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the structure of each valve in the gas turbine fuel supply system proposed in the embodiments of this application.

[0030] In the diagram: 100, Gas fuel supply module; 110, Gas fuel supply equipment; 120, Gas fuel supply pipe; 121, First control valve; 122, First temperature sensor; 123, First quick-stop valve; 124, Second quick-stop valve; 125, First pressure sensor; 126, First regulating valve; 127, Second pressure sensor; 130, Gas vent pipe; 131, Vent valve; 132, Second control valve; 140, First hose; 200, Liquid fuel supply module; 210, Liquid fuel supply equipment; 220, Liquid fuel supply pipe; 221, Third control valve; 222, Second temperature sensor; 223, Third pressure sensor; 224, Fourth quick-stop valve; 225, Fourth pressure sensor; 226, Second regulating valve; 227. 228. Fifth quick-break valve; 230. Fifth pressure sensor; 240. Second hose; 250. First return oil pipe; 260. Second return oil pipe; 300. Third return oil pipe; 310. Compressed air purging module; 321. Compressed air supply equipment; 322. Compressed air supply pipe; 321. Fourth control valve; 322. Third regulating valve; 330. First branch pipe; 331. Fifth control valve; 332. Sixth pressure sensor; 333. First check valve; 340. Second branch pipe; 341. Sixth control valve; 342. Seventh pressure sensor; 343. Second check valve; 400. Protective gas purging module; 410. Protective gas supply equipment; 420. Protective gas supply pipe; 421. Seventh control valve; 5. Gas fuel main pipe; 6. Liquid fuel main pipe. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that in the description of this application, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0035] like Figure 1 As shown, this application provides an embodiment of a gas turbine fuel supply system, which includes: a gaseous fuel supply module 100, a liquid fuel supply module 200, a compressed air purging module 300, and a protective gas purging module 400. The gaseous fuel supply module 100 supplies gaseous fuel to the gas turbine; the liquid fuel supply module 200 supplies liquid fuel to the gas turbine; the compressed air purging module 300 cleans and cools the liquid fuel supply module 200 and cools the gaseous fuel supply module 100; and the protective gas purging module 400 cleans the gaseous fuel supply module 100.

[0036] Specifically, in the embodiments of this application, the gas fuel supply module 100 can be any commercially available fuel supply module without any restrictions; the liquid fuel supply module 200 can also be any commercially available fuel supply module without any restrictions; the compressed air purging module 300, as the name suggests, is a module that can be purged with compressed air; and the protective gas purging module 400, as the name suggests, is a module that can be purged with protective gas.

[0037] It is important to understand that after a fuel switch in a dual-fuel gas turbine, the non-operating fuel supply module needs to be cleaned with gas to prevent gaseous fuel from remaining in the gaseous fuel supply module 100 and causing combustion or explosion accidents, or liquid fuel from remaining in the liquid fuel supply module 200 and causing coking and clogging of pipelines or nozzles. During the operation of the dual-fuel gas turbine, the nozzles corresponding to the non-operating fuel supply module are constantly exposed to a high-temperature and high-pressure combustion environment. To extend their service life, they also need to be continuously cooled by gas. Therefore, it is easy to understand that this application breaks down the purging of the non-operating fuel supply module into two steps: cleaning and cooling.

[0038] Specifically, if the dual-fuel gas turbine switches from liquid fuel to gaseous fuel, that is, if the non-working fuel supply module is the liquid fuel supply module 200, then only the compressed air purging module 300 needs to be used to clean and cool the liquid fuel supply module 200. If the dual-fuel gas turbine switches from gaseous fuel to liquid fuel, that is, if the non-working fuel supply module is the gaseous fuel supply module 100, then the protective gas purging module 400 needs to be used to clean the gaseous fuel supply module 100, and then the compressed air purging module 300 needs to be used to cool the gaseous fuel supply module 100.

[0039] In the embodiments of this application, the protective gas refers to any gas that will not undergo chemical reactions such as combustion with the gaseous fuel. For example, if the gaseous fuel is natural gas, the protective gas can be an inert gas, or nitrogen can be selected to reduce the cost of use.

[0040] It should be understood that, in this embodiment of the application, when purging the gas fuel supply module 100, a protective gas purging module 400 is used to clean the gas fuel supply module 100. Since the protective gas does not undergo chemical reactions such as combustion with the gas fuel, no explosions or other phenomena will occur that could damage the gas fuel supply module 100. Furthermore, after the protective gas purging module 400 has finished cleaning, a compressed air purging module 300 is used to continuously cool the protective gas purging module 400. Compared to the cost of obtaining the protective gas, the cost of obtaining compressed air is relatively low, thereby saving on usage costs.

[0041] In one embodiment of this application, such as Figure 2 and Figure 3 As shown, the gas fuel supply module 100 includes: a gas fuel supply device 110, a gas fuel supply pipe 120, a gas venting pipe 130, a first valve assembly, and a second valve assembly. The first end of the gas fuel supply pipe 120 is connected to the gas fuel supply device 110, and the second end of the gas fuel supply pipe 120 is connected to the gas fuel main pipe 5. That is, the gas fuel supply device 110 supplies gas fuel to the gas fuel main pipe 5 through the gas fuel supply pipe 120. In other words, the gas fuel supply pipe 120 can be any type of pipe capable of transporting gas fuel. The gas fuel supply device 110 is a very mature technology in this field, so it will not be described in detail. The first end of the gas vent pipe 130 is connected to the gas fuel supply pipe 120. The gas vent pipe 130 is mainly used to discharge the gas fuel in the gas fuel supply pipe 120. Therefore, there are no restrictions on the gas vent pipe 130, and it can be a pipe of any shape or structure. The first valve assembly is used to control the opening and closing of the gas fuel supply pipe 120 at least. The second valve assembly is used to control the opening and closing of the gas vent pipe 130 at least.

[0042] In one embodiment of this application, such as Figure 3 As shown, the first valve assembly includes a first control valve 121 disposed on the gas fuel supply pipe 120; the second valve assembly includes a second control valve 132 disposed on the gas vent pipe 130. If it is necessary to supply gas fuel to the gas fuel main pipe 5 through the gas fuel supply device 110, the first control valve 121 is opened and the second control valve 132 is closed; if it is necessary to vent the gas fuel in the gas fuel supply pipe 120 through the gas vent pipe 130, the second control valve 132 is opened and the first control valve 121 is closed.

[0043] Specifically, in the embodiments of this application, a control valve refers to any valve capable of controlling the opening and closing of a pipeline, such as: the first control valve 121, the second control valve 132, and the third control valve 221 mentioned below. It is readily understood that the control valve can be any type of valve; for example, it can be a valve that is manually controlled to open and close, a valve that is electrically controlled to open and close, or a valve controlled by hydraulic, pneumatic, turbine, pneumatic-hydraulic, spur gear, or bevel gear mechanisms; it can be a gate valve, globe valve, plug valve, ball valve, or butterfly valve, etc.

[0044] In one specific embodiment of this application, all control valves are gate valves in order to ensure good sealing performance.

[0045] It is important to understand that when purging the non-working fuel supply module, the pressure of the purging gas must be greater than the combustion pressure in the combustion chamber. If the pressure of the purging gas is lower than the combustion pressure in the combustion chamber, the high-temperature, high-pressure combustion gases can easily flow back into the non-working fuel supply module, thereby damaging it.

[0046] To prevent high-temperature, high-pressure gas in the combustion chamber from flowing back into the gas fuel supply pipe 120 or from gas fuel leakage, which could damage the gas fuel supply pipe 120, in one embodiment of this application, the first valve assembly further includes a first temperature sensor 122, a first quick-cutoff valve 123, and a second quick-cutoff valve 124 disposed in the gas fuel supply pipe 120. The first temperature sensor 122 is primarily used to monitor the temperature inside the gas fuel supply pipe 120. If the temperature exceeds the limit, it indicates a potential safety accident, such as backflow of high-temperature, high-pressure gas in the combustion chamber or gas fuel leakage from the gas fuel supply device 110 leading to combustion and explosion in the gas fuel supply pipe 120. The first quick-cutoff valve 123 and the second quick-cutoff valve 124 are primarily used to cut off the gas fuel supply pipe 120.

[0047] Specifically, such as Figure 2As shown, in this embodiment, the first control valve 121, the first temperature sensor 122, the first quick-cutoff valve 123, and the second quick-cutoff valve 124 are arranged sequentially along a first direction, which points from the first end of the gas fuel supply pipe 120 to the second end. The gas vent pipe 130 is located between the first quick-cutoff valve 123 and the second quick-cutoff valve 124. That is, if an accident occurs in the gas fuel supply pipe 120, the first quick-cutoff valve 123 and the second quick-cutoff valve 124 can quickly cut off the gas fuel supply pipe 120. At the same time, the gas vent pipe 130 can discharge the dangerous gas between the first quick-cutoff valve 123 and the second quick-cutoff valve 124, forming a safe section in the middle of the gas fuel supply pipe 120 where secondary combustion cannot occur, thus preventing the safety accident from escalating further.

[0048] It is important to understand that when a gas turbine is operating, if too much fuel enters the combustion chamber, it can easily lead to poor combustion, and in severe cases, overload and turbine shutdown; conversely, if too little fuel enters the combustion chamber, it can easily result in insufficient power from the gas turbine. Therefore, in one embodiment of this application, such as Figure 3 As shown, the first valve assembly also includes a first pressure sensor 125, a first regulating valve 126, and a second pressure sensor 127 disposed on the gas fuel supply pipe 120, and the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 are arranged sequentially along a first direction. It should be clear that, in the embodiments of this application, "arranged sequentially along a certain direction" does not specifically mean that the components are arranged in a straight line. For example, if the gas fuel supply pipe 120 is a straight pipe, then the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 can be considered as arranged in a straight line along the first direction; if the gas fuel supply pipe 120 is a curved pipe, then the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 can be considered as arranged along the first direction, but the line connecting the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 may not be a straight line.

[0049] In this embodiment, the pressure before the first regulating valve 126 is monitored by the first pressure sensor 125, and the pressure after the first regulating valve 126 is monitored by the second pressure sensor 127. Based on the pressure difference between the first regulating valve 126 and the pressure after the first regulating valve 126, and in combination with the opening degree of the first regulating valve 126, the amount of fuel entering the combustion chamber can be precisely adjusted and controlled.

[0050] It should be clear that in the embodiments of this application, the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 can be located at any position in the gas fuel supply pipe 120. However, the gas fuel has a pressure drop during supply. Therefore, in order to more accurately control the amount of gas fuel, such as Figure 3As shown, the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 are positioned close to the gas fuel main pipe 5.

[0051] In the embodiments of this application, the regulating valve refers to a valve capable of adjusting its own opening degree, such as the first regulating valve 126, and the second regulating valve 226 and the third regulating valve 322 mentioned below. It can be any type of valve capable of adjusting its own opening degree, and there are no restrictions on its type, such as an electric regulating valve or a pneumatic regulating valve.

[0052] It should be understood that if a combustion explosion occurs in the gas fuel supply pipe 120 or the gas pressure is too high, it can easily damage the gas fuel supply pipe 120 or various valves. To reduce this risk, in a specific embodiment of this application, such as Figure 3 As shown, the second valve assembly also includes a vent valve 131 disposed on the gas vent pipe 130. The vent valve 131 and the second control valve 132 are arranged sequentially along a second direction, which points from the first end of the gas vent pipe 130 to the second end.

[0053] Specifically, the vent valve is a safety valve. When the internal pressure of the gas fuel supply pipe 120 exceeds the set value due to some temporary reason, a certain amount of gas can be discharged through the vent valve 131 to reduce the pressure in the gas fuel supply pipe 120, thereby protecting the gas fuel supply pipe 120 and various valves.

[0054] In one embodiment of this application, such as Figure 3 As shown, the protective gas purging module 400 includes: a protective gas supply device 410, a protective gas supply pipe 420, and a seventh control valve 421. The protective gas supply device 410 can be any device capable of generating protective gas at a certain pressure. For example, the protective gas supply device 410 can be a tank for storing protective gas, and protective gas at a certain pressure is obtained by heating the tank. The first end of the protective gas supply pipe 420 is connected to the protective gas supply device 410, and the second end of the protective gas supply pipe 420 is connected to the gas fuel supply pipe 120. That is, the protective gas supply device 410 delivers protective gas to the gas fuel supply pipe 120 through the protective gas supply pipe 420. The seventh control valve 421 is located on the protective gas supply pipe 420 and is used to control the opening or closing of the protective gas supply pipe 420.

[0055] In another embodiment of this application, in order to enable the gas fuel supply pipe 120 located between the first quick-stop valve 123 and the second quick-stop valve 124 to quickly form a safety section, such as... Figure 3 As shown, the protective gas supply pipe 420 is located between the first quick-break valve 123 and the second quick-break valve 124.

[0056] After introducing the gas fuel supply module 100 and the protective gas purging module 400 in the embodiments of this application, the liquid fuel supply module 200 in the embodiments of this application will be introduced in detail below.

[0057] Specifically, such as Figure 3 As shown, the liquid fuel supply module 200 includes: a liquid fuel supply device 210, a liquid fuel supply pipe 220, a third valve assembly, and a return pipe assembly. The liquid fuel supply device 210 is a relatively mature existing technology and therefore will not be described in detail. The first end of the liquid fuel supply pipe 220 is connected to the liquid fuel supply device 210, and the second end of the liquid fuel supply pipe 220 is connected to the liquid fuel main pipe 6. That is, the liquid fuel supply device 210 supplies liquid fuel to the liquid fuel main pipe 6 through the liquid fuel supply pipe 220. It is easy to understand that the liquid fuel supply pipe 220 only needs to have a liquid fuel supply function; in the embodiments of this application, its shape and structure are not limited. The third valve assembly includes a third control valve 221 disposed on the liquid fuel supply pipe 220; the third valve assembly is used at least to control the opening and closing of the liquid fuel supply pipe 220; the return pipe assembly is used for the return of oil from the liquid fuel supply pipe 220.

[0058] For reasons similar to those described above, to avoid too much or too little fuel entering the combustion chamber, in one embodiment of this application, such as... Figure 3 As shown, the third valve assembly also includes a fourth pressure sensor 225, a second regulating valve 226 and a fifth pressure sensor 228 disposed on the liquid fuel supply pipe 220. The third control valve 221, the fourth pressure sensor 225, the second regulating valve 226 and the fifth pressure sensor 228 are arranged sequentially along a third direction, which points from the first end of the liquid fuel supply pipe 220 to the second end.

[0059] Specifically, the pressure before the second regulating valve 226 is monitored by the fourth pressure sensor 225, and the pressure after the second regulating valve 226 is monitored by the fifth pressure sensor 228. The opening of the second regulating valve 226 is adjusted based on the pressure difference between the pressure before and after the valve, so as to make the amount of liquid fuel entering the combustion chamber more accurate.

[0060] It should be understood that, since the second regulating valve 226 is a precision device, excessive pressure in the liquid fuel within it can easily damage it. Therefore, in one embodiment of this application, the third valve assembly further includes a fourth quick-stop valve 224 and a fifth quick-stop valve 227 disposed on the liquid fuel supply pipe 220, wherein the fourth quick-stop valve 224, the second regulating valve 226, and the fifth quick-stop valve 227 are arranged sequentially along a third direction.

[0061] Specifically, such as Figure 3 As shown, if the pressure before the second regulating valve 226 is too high, the fourth quick-stop valve 224 is closed to prevent the liquid fuel with excessive pressure from damaging the second regulating valve 226; if the pressure after the second regulating valve 226 is too high, for example, due to the backflow of high-temperature and high-pressure gas in the combustion chamber, the fifth quick-stop valve 227 is closed to prevent the second regulating valve 226 from being damaged.

[0062] For reasons similar to those mentioned above, in order to prevent the high-temperature and high-pressure combustion gas in the combustion chamber from flowing back into the liquid fuel supply pipe 220 or other abnormal causes, which could damage the liquid fuel supply pipe 220 or the various valves, in one embodiment of this application, the third valve assembly further includes a second temperature sensor 222 and a third pressure sensor 223 disposed in the liquid fuel supply pipe 220. The third control valve 221, the second temperature sensor 222, the third pressure sensor 223, the fourth quick-stop valve 224, the fourth pressure sensor 225, the second regulating valve 226, the fifth quick-stop valve 227, and the fifth pressure sensor 228 are arranged sequentially along the third direction.

[0063] Specifically, the second temperature sensor 222 and the third pressure sensor 223 monitor the situation in the liquid fuel supply pipe 220 in real time. Based on the monitoring results of the second temperature sensor 222 and the third pressure sensor 223, relevant adjustments are made to prevent the expansion of various safety accidents.

[0064] It should be clear that, in the embodiments of this application, such as Figure 3 As shown, the return oil pipe assembly includes a first return oil pipe 240, a second return oil pipe 250, and a third return oil pipe 260. The first return oil pipe 240 is located between the fourth quick-stop valve 224 and the fourth pressure sensor 225; the second return oil pipe 250 is located between the second regulating valve 226 and the fifth quick-stop valve 227; and the third return oil pipe 260 is located between the fifth quick-stop valve 227 and the fifth pressure sensor 228. In other words, the first return oil pipe 240 is used to recover liquid fuel between the fourth quick-stop valve 224 and the fourth pressure sensor 225; the second return oil pipe 250 is used to recover liquid fuel between the second regulating valve 226 and the fifth quick-stop valve 227; and the third return oil pipe 260 is used to recover liquid fuel between the fifth quick-stop valve 227 and the fifth pressure sensor 228.

[0065] After introducing the liquid fuel supply module 200 in the embodiments of this application, the compressed air purging module 300 in the embodiments of this application will be described in detail below.

[0066] Specifically, such as Figure 3As shown, the compressed air purging module 300 includes: a compressed air supply device 310, a compressed air supply pipe 320, a first branch pipe 330, a second branch pipe 340, and a fourth valve assembly. The compressed air supply device 310 stores and supplies compressed air. It's easy to imagine that the compressed air supply device 310 can be any device; for example, it can consist of one or more compressors and a matching air tank. The set pressure value of the air tank should be higher than the working pressure of the combustion chamber. The compressor operates according to the set pressure value to ensure sufficient purging air volume. Specifically, considering the pressure drop of compressed air in the gaseous fuel supply pipe 120 or the liquid fuel supply pipe 220, the ratio of the pressure in the air tank to the pressure after the combustion chamber is operating normally is k, and k must be greater than 1. It is important to understand that if the value of k is less than or equal to 1, due to the pressure drop, the combustion gases in the combustion chamber will definitely flow back into the fuel supply module. If the value of k is large, the cost of obtaining the compressed air will be high, and excessively high compressed air pressure will also damage the purging fuel supply module. In a specific embodiment of this application, k is greater than or equal to 2.0 and less than or equal to 5.0. Specifically, k can be any value among 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0, or any value between any two adjacent values ​​mentioned above. The first end of the compressed air supply pipe 320 is connected to the compressed air supply device 310. The second end of the compressed air supply pipe 320 extends into a first branch pipe 330 and a second branch pipe 340. The first branch pipe 330 is used to connect to the gaseous fuel supply pipe 120, and the second branch pipe 340 is used to connect to the liquid fuel supply pipe 220. That is, the compressed air supply device 310 delivers compressed air to the gaseous fuel supply pipe 120 through the compressed air supply pipe 320 and the first branch pipe 330, and delivers compressed air to the liquid fuel supply pipe 220 through the compressed air supply pipe 320 and the second branch pipe 340.

[0067] Specifically, the fourth valve assembly is used to control the opening and closing of at least the compressed air supply pipe 320, the first branch pipe 330, and the second branch pipe 340, such as... Figure 3 As shown, the fourth valve assembly includes: a fourth control valve 321 disposed on the compressed air supply pipe 320; a fifth control valve 331 disposed on the first branch pipe 330; and a sixth control valve 341 disposed on the second branch pipe 340.

[0068] It should be clear that, as mentioned above, if the compressed gas pressure in the first branch pipe 330 or the second branch pipe 340 is lower than the gas pressure in the combustion chamber, the nozzle cannot be cleaned and cooled. Therefore, in one embodiment of this application, such as Figure 3 As shown, the fourth valve assembly also includes a third regulating valve 322 disposed on the compressed air supply pipe 320.

[0069] Specifically, since the gas turbine speed and power are positively correlated with the pressure in the combustion chamber, the opening of the third regulating valve 322 can be set based on the gas turbine speed or power to ensure the pressure of the compressed air used for purging.

[0070] It should be clear that, in order to prevent excessive gas pressure in the combustion chamber from backflowing into the first branch pipe 330, in one embodiment of this application, such as Figure 3 As shown, the fourth valve assembly also includes a sixth pressure sensor 332 and a first check valve 333 disposed on the first branch pipe 330. The fifth control valve 331, the sixth pressure sensor 332, and the first check valve 333 are arranged sequentially along the airflow direction in the first branch pipe 330, which refers to the direction in which compressed air flows from the compressed air supply device 310 to the gas fuel supply pipe 120. The first check valve 333 effectively prevents gas in the combustion chamber from flowing back into the first branch pipe 330.

[0071] For reasons similar to those described above, in another embodiment of this application, the fourth valve assembly further includes a seventh pressure sensor 342 and a second check valve 343 disposed in the second branch pipe 340, and the sixth control valve 341, the seventh pressure sensor 342 and the second check valve 343 are arranged sequentially along the airflow direction in the second branch pipe 340.

[0072] It is important to understand that gas turbines generate vibrations during operation. To prevent damage to the connection between the gas fuel supply pipe 120 or the liquid fuel supply pipe 220 and the gas turbine due to a rigid connection, which could lead to fuel leakage or even a safety accident, in one embodiment of this application, such as... Figure 3 As shown, the second end of the gaseous fuel supply pipe 120 is connected to the gaseous fuel main pipe 5 via the first hose 140, while the second end of the liquid fuel supply pipe 220 is connected to the liquid fuel main pipe 6 via the second hose 230. Specifically, since the first hose 140 and the second hose 230 are used in high-temperature environments, in order to ensure a longer service life for the first hose 140 and the second hose 230, they can be selected as metal hoses.

[0073] In the above embodiments, the gas turbine fuel supply system uses a protective gas purging module to clean the gaseous fuel supply module. Since the protective gas and gaseous fuel do not undergo combustion or other chemical reactions, no explosions or other phenomena that could damage the gaseous fuel supply module will occur. Furthermore, after the protective gas purging module is cleaned, a compressed air purging module continuously cools it. The cost of obtaining compressed air is relatively lower than the cost of obtaining protective gas, thus saving on operating costs.

[0074] After introducing the embodiments of the gas turbine fuel supply system in this application, the embodiments of the gas turbine proposed in this application are described below.

[0075] Specifically, the gas turbine in this application embodiment has a gas turbine fuel supply system as proposed in any of the above embodiments, that is, the gas turbine adopts the gas turbine fuel supply system disclosed in this application embodiment.

[0076] In the above embodiments, the gas turbine uses a protective gas purging module to clean the gas fuel supply module. Since the protective gas and gas fuel do not undergo combustion or other chemical reactions, no explosions or other phenomena that could damage the gas fuel supply module will occur. Furthermore, after the protective gas purging module is cleaned, a compressed air purging module continuously cools it. The cost of obtaining compressed air is relatively lower than the cost of obtaining protective gas, thus saving on operating costs.

[0077] After introducing the embodiments of the gas turbine in this application, the embodiments of the gas turbine fuel supply method proposed in this application are described below.

[0078] Specifically, the gas turbine fuel supply method in this application uses the gas turbine fuel supply system proposed in any of the above embodiments. That is, the gas turbine fuel supply method uses the gas turbine fuel supply system disclosed in the embodiments of this application to supply fuel.

[0079] In one specific embodiment of this application, the gas turbine fuel supply method includes: cleaning the gas fuel supply module 100 based on the protective gas purging module 400; cleaning and cooling the liquid fuel supply module 200 based on the compressed air purging module 300; and cooling the gas fuel supply module 100 based on the compressed air purging module 300.

[0080] Specifically, before the gas turbine uses gaseous fuel, the seventh control valve 421 needs to be opened, and the gas fuel supply pipe 120 needs to be purged with protective gas through the protective gas supply device 410 to prevent gaseous fuel from remaining in the gas fuel supply pipe 120 and causing combustion and explosion.

[0081] Specifically, when the gas turbine does not burn gaseous fuel, the first quick-break valve 123 and the second quick-break valve 124 of the gas fuel supply module 100 are normally closed, and the vent valve 131 and the second control valve 132 are normally open. If there is dangerous gas in the gas fuel supply pipe 120, it can be discharged in time. When the gas turbine burns gaseous fuel, the first control valve 121 is opened. When the gas turbine starts up to the gas supply speed, the first quick-cutoff valve 123 and the second quick-cutoff valve 124 are opened, and the vent valve 131, the second control valve 132, and the seventh control valve 421 are closed. The first regulating valve 126 is controlled to operate according to the given fuel supply pattern. The gaseous fuel enters the combustion chamber through the first quick-cutoff valve 123, the second quick-cutoff valve 124, the first regulating valve 126, the first hose 140, and the gas fuel main pipe 5. During the process of increasing or decreasing the load of the gas turbine, the first regulating valve 126 measures the required fuel according to the pressure and temperature before and after the valve and controls the fuel to enter the combustion chamber. If the turbine stops, the first quick-cutoff valve 123 and the second quick-cutoff valve 124 are closed, and the vent valve 131 and the second control valve 132 are opened to discharge the gaseous fuel between the first quick-cutoff valve 123 and the second quick-cutoff valve 124 to a safe area to prevent subsequent combustion and explosion.

[0082] Specifically, when the gas turbine does not burn liquid fuel, the fourth quick-stop valve 224 and the fifth quick-stop valve 227 of the liquid fuel supply module 200 are normally closed. When the gas turbine burns liquid fuel, the third control valve 221 is opened. When the gas turbine starts up to the fuel supply speed, the fourth quick-stop valve 224 and the fifth quick-stop valve 227 are opened, controlling the second regulating valve 226 to operate according to the given fuel supply pattern. Liquid fuel enters the combustion chamber through the fourth quick-stop valve 224 and the fifth quick-stop valve 227, the second regulating valve 226, the second hose 230, and the liquid fuel main pipe 6. During the process of increasing or decreasing the load of the gas turbine, the second regulating valve 226 measures the required fuel according to the pressure and temperature of the working fluid before and after the valve, and controls the fuel to enter the combustion chamber. If the turbine stops, the fourth quick-stop valve 224 and the fifth quick-stop valve 227 are closed, and the liquid fuel in the liquid fuel supply pipe 220 returns to the oil source through the return oil pipe assembly.

[0083] Specifically, the compressed air purging module 300 is used to purge the non-working fuel supply module. When the gas turbine is working, the fourth control valve 321 is opened, and the pressure of the compressed air is adjusted by the third regulating valve 322. The fifth control valve 331 is used to control the purging gas leading to the gaseous fuel supply pipe 120, and the sixth control valve 341 is used to control the purging gas leading to the liquid fuel supply pipe 220. The first check valve 333 and the second check valve 343 are used to prevent the high-temperature and high-pressure gas generated by combustion from flowing back into the compressed air purging module 300.

[0084] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas turbine fuel supply system characterized by, The application relates to a gas turbine fuel supply system, comprising: a gas fuel supply module (100) for supplying gas fuel to a gas turbine; a liquid fuel supply module (200) for supplying liquid fuel to the gas turbine; a compressed air purge module (300) for cleaning and cooling the liquid fuel supply module (200) and for cooling the gas fuel supply module (100); a protective gas purge module (400) for cleaning the gas fuel supply module (100); the gas fuel supply module (100) comprises: a gas fuel supply device (110); a gas fuel supply pipe (120) having a first end in communication with the gas fuel supply device (110) and a second end in communication with a gas fuel main pipe (5); a gas diffusion pipe (130) having a first end in communication with the gas fuel supply pipe (120); a first valve assembly for at least controlling opening and closing of the gas fuel supply pipe (120); a second valve assembly for at least controlling opening and closing of the gas diffusion pipe (130); the liquid fuel supply module (200) comprises: a liquid fuel supply device (210); a liquid fuel supply pipe (220) having a first end in communication with the liquid fuel supply device (210) and a second end in communication with a liquid fuel main pipe (6); a third valve assembly for at least controlling opening and closing of the liquid fuel supply pipe (220); a return oil pipe assembly for the liquid fuel supply pipe (220); the third valve assembly comprises a third control valve (221) arranged in the liquid fuel supply pipe (220); the third valve assembly further comprises a fourth pressure sensor (225), a second regulating valve (226) and a fifth pressure sensor (228) arranged in the liquid fuel supply pipe (220), the third control valve (221), the fourth pressure sensor (225), the second regulating valve (226) and the fifth pressure sensor (228) being arranged in a third direction in sequence, the third direction being from the first end to the second end of the liquid fuel supply pipe (220); the third valve assembly further comprises a fourth quick-break valve (224) and a fifth quick-break valve (227) arranged in the liquid fuel supply pipe (220), the fourth quick-break valve (224), the second regulating valve (226) and the fifth quick-break valve (227) being arranged in the third direction in sequence; the third valve assembly further comprises a second temperature sensor (222) and a third pressure sensor (223) arranged in the liquid fuel supply pipe (220), the third control valve (221), the second temperature sensor (222), the third pressure sensor (223), the fourth quick-break valve (224), the fourth pressure sensor (225), the second regulating valve (226), the fifth quick-break valve (227) and the fifth pressure sensor (228) being arranged in the third direction in sequence. The oil return pipe assembly comprises a first oil return pipe (240), a second oil return pipe (250) and a third oil return pipe (260), wherein the first oil return pipe (240) is located between the fourth speed cut valve (224) and the fourth pressure sensor (225); the second oil return pipe (250) is located between the second regulating valve (226) and the fifth speed cut valve (227); and the third oil return pipe (260) is located between the fifth speed cut valve (227) and the fifth pressure sensor (228); The first valve assembly further comprises a first temperature sensor (122), a first speed cut valve (123) and a second speed cut valve (124) arranged on the gas fuel supply pipe (120); The first valve assembly further comprises a first pressure sensor (125), a first regulating valve (126) and a second pressure sensor (127) arranged on the gas fuel supply pipe (120); When the gas fuel supply module (100) is purged, the gas fuel supply module (100) is cleaned by the protective gas purging module (400); after the protective gas purging module (400) is cleaned, the protective gas purging module (400) is continuously cooled by the compressed air purging module (300).

2. The gas turbine fuel supply system of claim 1 wherein, The first valve assembly comprises a first control valve (121) arranged on the gas fuel supply pipe (120); and the second valve assembly comprises a second control valve (132) arranged on the gas diffusion pipe (130).

3. The gas turbine fuel supply system of claim 2 wherein, The first control valve (121), the first temperature sensor (122), the first speed cut valve (123) and the second speed cut valve (124) are arranged in a first direction in sequence, the first direction is from the first end to the second end of the gas fuel supply pipe (120), and the gas diffusion pipe (130) is located between the first speed cut valve (123) and the second speed cut valve (124).

4. The gas turbine fuel supply system of claim 3 wherein, The first pressure sensor (125), the first regulating valve (126) and the second pressure sensor (127) are arranged in a first direction in sequence.

5. The gas turbine fuel supply system of claim 3 wherein, The second valve assembly further comprises a diffusion valve (131) arranged on the gas diffusion pipe (130), and the diffusion valve (131) and the second control valve (132) are arranged in a second direction in sequence, the second direction is from the first end to the second end of the gas diffusion pipe (130).

6. The gas turbine fuel supply system of any one of claims 1 to 5, characterized in that, The protective gas purging module (400) comprises: a protective gas supply device (410); a protective gas supply pipe (420) having a first end in communication with the protective gas supply device (410) and a second end in communication with the gas fuel supply pipe (120); a seventh control valve (421) arranged on the protective gas supply pipe (420).

7. The gas turbine fuel supply system of claim 1 wherein, The compressed air purging module (300) comprises: a compressed air supply device (310); a compressed air supply pipe (320) having a first end connected to the compressed air supply device (310) and a second end extending into a first branch pipe (330) and a second branch pipe (340), wherein the first branch pipe (330) is configured to be connected to the gaseous fuel supply pipe (120) and the second branch pipe (340) is configured to be connected to the liquid fuel supply pipe (220); a fourth valve assembly configured to control opening and closing of the compressed air supply pipe (320), the first branch pipe (330) and the second branch pipe (340).

8. The gas turbine fuel supply system of claim 7 wherein, The fourth valve assembly comprises: a fourth control valve (321) arranged in the compressed air supply pipe (320); a fifth control valve (331) arranged in the first branch pipe (330); a sixth control valve (341) arranged in the second branch pipe (340).

9. The gas turbine fuel supply system of claim 8 wherein, The fourth valve assembly further comprises a third regulating valve (322) arranged in the compressed air supply pipe (320).

10. The gas turbine fuel supply system of claim 8 wherein, The fourth valve assembly further comprises a sixth pressure sensor (332) and a first one-way valve (333) arranged in the first branch pipe (330), wherein the fifth control valve (331), the sixth pressure sensor (332) and the first one-way valve (333) are arranged in sequence along a flow direction of the first branch pipe (330); and / or a seventh pressure sensor (342) and a second one-way valve (343) arranged in the second branch pipe (340), wherein the sixth control valve (341), the seventh pressure sensor (342) and the second one-way valve (343) are arranged in sequence along a flow direction of the second branch pipe (340).

11. A gas turbine engine characterized by, A gas turbine fuel supply system according to any one of claims 1 to 10.

12. A method of fuel supply for a gas turbine, characterized by, A method for using a gas turbine fuel supply system according to any one of claims 1 to 10, the method comprising: cleaning the gaseous fuel supply module (100) based on the protective gas purging module (400).

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