CN220285868U - Gas turbine and fuel supply system thereof - Google Patents

Abstract

The application discloses a gas turbine and fuel supply system thereof relates to gas turbine technical field. Comprising the following steps: a gas fuel supply module for supplying gas fuel to the gas turbine; a liquid fuel supply module for supplying liquid fuel to the gas turbine; the compressed air purging module is used for cleaning and cooling the liquid fuel supply module; and, for cooling the gaseous fuel supply module; and the shielding gas purging module is used for cleaning the gas fuel supply module. The protection gas purging module is adopted to clean the gas fuel supply module, and the protection gas and the gas fuel cannot generate chemical reactions such as combustion, so that phenomena such as explosion and the like cannot be generated to damage the gas fuel supply module. And after the cleaning of the protective gas purging module is completed, the compressed air purging module is adopted to continuously cool the protective gas purging module, so that the cost is relatively low.

Description

Gas turbine and fuel supply system thereof

Technical Field

The application relates to the technical field of gas turbines, in particular to a gas turbine and a fuel supply system thereof.

Background

The gas turbine is a rotary impeller type heat engine, which uses continuously flowing gas as working medium to drive the impeller to rotate at high speed, and is an internal combustion type power machine for converting the energy of fuel into useful work. The gas turbine has the advantages of small volume, high starting speed, portability, high power density and the like, and is widely applied to the aspects of vehicles, ship power, power generation, pipeline pressurization and the like.

With the development of technology, a dual-fuel gas turbine is emerging on the market, which is a gas turbine that can use both gaseous and liquid fuel. The gas turbine adopts a dual-fuel combustion technology, so that the adaptability of the gas turbine to fuel can be improved, and the application field of the gas turbine can be widened. However, the current dual fuel technology for gas turbines is still not mature, for example: if the gas turbine is switched from liquid fuel to gas fuel, the liquid fuel stored in the liquid fuel supply pipe is likely to coke and clog the pipe or the nozzle, and in order to solve this problem, patent publication No. is: CN112727604a, entitled: patent literature for liquid/gas dual fuel supply systems for gas turbines discloses one solution: the supply lines and nozzles are purged with compressed air to prevent coking. However, this method is not suitable for the case of purging the gas fuel supply pipe when the gas turbine is switched from the gas fuel to the liquid fuel, because the compressed air contains oxygen, and the oxygen is liable to burn and explode with the gas fuel in the gas fuel supply pipe to damage the supply pipe.

Disclosure of Invention

The utility model aims to provide a gas turbine and a fuel supply system thereof, which are used for solving the technical problem that the gas fuel supply pipe is easy to generate explosion when being purged.

In order to achieve the above purpose, the present application provides the following technical solutions:

in a first aspect, the present application provides a gas turbine fuel supply system comprising: a gas fuel supply module for supplying gas fuel to the gas turbine; a liquid fuel supply module for supplying liquid fuel to the gas turbine; the compressed air purging module is used for cleaning and cooling the liquid fuel supply module; and, for cooling the gaseous fuel supply module; and the shielding gas purging module is used for cleaning the gas fuel supply module.

As another embodiment of the present application, the gaseous fuel supply module includes: a gaseous fuel supply apparatus; a gaseous fuel supply pipe having a first end in communication with the gaseous fuel supply apparatus and a second end in communication with a gaseous fuel manifold; a gas diffusion tube, the first end of which is communicated with the gas fuel supply tube; a first valve assembly for controlling at least the opening and closing of said gaseous fuel supply line; and the second valve component is at least used for controlling the opening and closing of the gas diffusion pipe.

As another embodiment of the present application, the first valve assembly includes a first control valve disposed at the gaseous fuel supply pipe; the second valve assembly includes a second control valve disposed in the gas diffusion tube.

As another embodiment of the present application, the first valve assembly further comprises a first temperature sensor, a first quick disconnect valve and a second quick disconnect valve disposed in the gas fuel supply pipe, the first control valve, the first temperature sensor, the first quick disconnect valve and the second quick disconnect valve are sequentially arranged along a first direction, the first direction is defined by a first end of the gas fuel supply pipe pointing to a second end, and the gas diffusion pipe is disposed between the first quick disconnect valve and the second quick disconnect valve.

As another embodiment of the present application, the first valve assembly further includes a first pressure sensor, a first regulating valve, and a second pressure sensor disposed in the gas fuel supply pipe, the first pressure sensor, the first regulating valve, and the second pressure sensor being sequentially arranged along a first direction.

As another embodiment of the present application, the second valve assembly further includes a bleed valve disposed in the gas bleed tube, the bleed valve and the second control valve being sequentially arranged along a second direction, the second direction being directed by the first end of the gas bleed tube toward the second end.

As another embodiment of the present application, the shielding gas purge module includes: a shielding gas supply device; a shielding gas supply pipe, a first end of which is communicated with the shielding gas supply equipment, and a second end of which is communicated with the gas fuel supply pipe; and a seventh control valve provided in the shielding gas supply pipe.

As another embodiment of the present application, the liquid fuel supply module includes: a liquid fuel supply device; a liquid fuel supply pipe, a first end of which is communicated with the liquid fuel supply equipment, and a second end of which is communicated with a liquid fuel main pipe; a third valve assembly for controlling at least opening and closing of the liquid fuel supply pipe; and the oil return pipe assembly is used for returning oil to the liquid fuel supply pipe.

As another embodiment of the present application, the third valve assembly includes a third control valve disposed at the liquid fuel supply pipe.

As another embodiment of the present application, the third valve assembly further includes a fourth pressure sensor, a second regulating valve and a fifth pressure sensor disposed in the liquid fuel supply pipe, the third control valve, the fourth pressure sensor, the second regulating valve and the fifth pressure sensor are sequentially arranged along a third direction, and the third direction is from the first end of the liquid fuel supply pipe to the second end.

As another embodiment of the present application, the third valve assembly further includes a fourth quick disconnect valve and a fifth quick disconnect valve disposed in the liquid fuel supply pipe, the fourth quick disconnect valve, the second regulator valve, and the fifth quick disconnect valve being sequentially arranged along a third direction.

As another embodiment of the present application, the third valve assembly further includes a second temperature sensor and a third pressure sensor disposed in the liquid fuel supply pipe, and the third control valve, the second temperature sensor, the third pressure sensor, the fourth quick disconnect valve, the fourth pressure sensor, the second regulating valve, the fifth quick disconnect valve, and the fifth pressure sensor are sequentially arranged along a third direction.

As another embodiment of the present application, the oil return pipe assembly includes a first oil return pipe, a second oil return pipe, and a third oil return pipe, wherein the first oil return pipe is located between the fourth quick disconnect valve and the fourth pressure sensor; the second oil return pipe is positioned between the second regulating valve and the fifth quick disconnect valve; the third oil return pipe is positioned between the fifth quick disconnect valve and the fifth pressure sensor.

As another embodiment of the present application, the compressed air purge module includes: a compressed air supply device; a compressed air supply pipe, a first end of which is connected with the compressed air supply device, and a second end of which extends out of a first branch pipe and a second branch pipe, wherein the first branch pipe is used for communicating with the gas fuel supply pipe; the second branch pipe is used for communicating with the liquid fuel supply pipe; and a fourth valve assembly at least for controlling the opening and closing of the compressed air supply pipe, the first branch pipe and the second branch pipe.

As another embodiment of the present application, the fourth valve assembly includes: a fourth control valve provided to the compressed air supply pipe; a fifth control valve provided to the first branch pipe; and the sixth control valve is arranged on the second branch pipe.

As another embodiment of the present application, the fourth valve assembly further includes a third regulating valve provided to the compressed air supply pipe.

As another embodiment of the present application, the fourth valve assembly further includes a sixth pressure sensor and a first check valve disposed in the first branch pipe, and the fifth control valve, the sixth pressure sensor and the first check valve are sequentially arranged along the air flow direction in the first branch pipe; and/or a seventh pressure sensor and a second one-way valve which are arranged on the second branch pipe, wherein the sixth control valve, the seventh pressure sensor and the second one-way valve are sequentially arranged along the airflow direction in the second branch pipe.

In a second aspect, the present application also proposes a gas turbine having a gas turbine fuel supply system according to any one of the first aspects.

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

the protection gas purging module is adopted to clean the gas fuel supply module, and the protection gas and the gas fuel cannot generate chemical reactions such as combustion, so that phenomena such as explosion and the like cannot be generated to damage the gas fuel supply module. And after the cleaning of the protective gas purging module is completed, the compressed air purging module is used for continuously cooling the protective gas purging module, so that the acquisition cost of the compressed air is relatively low relative to the acquisition cost of the protective gas, and the use cost is further saved.

Drawings

FIG. 1 is a schematic illustration of a gas turbine fuel supply system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of piping structures of a gas turbine fuel supply system according to an embodiment of the present application;

FIG. 3 is a schematic illustration of various valve configurations of a gas turbine fuel supply system according to an embodiment of the present application.

In the figure: 100. a gaseous fuel supply module; 110. a gaseous fuel supply apparatus; 120. a gas fuel supply pipe; 121. a first control valve; 122. a first temperature sensor; 123. a first quick-break valve; 124. a second speed shut-off valve; 125. a first pressure sensor; 126. a first regulating valve; 127. a second pressure sensor; 130. a gas diffusing pipe; 131. a bleed valve; 132. a second control valve; 140. a first hose; 200. a liquid fuel supply module; 210. a liquid fuel supply device; 220. a liquid fuel supply pipe; 221. a third control valve; 222. a second temperature sensor; 223. a third pressure sensor; 224. a fourth quick disconnect valve; 225. a fourth pressure sensor; 226. a second regulating valve; 227. a fifth quick disconnect valve; 228. a fifth pressure sensor; 230. a second hose; 240. a first oil return pipe; 250. a second oil return pipe; 260. a third oil return pipe; 300. a compressed air purge module; 310. a compressed air supply device; 320. a compressed air supply pipe; 321. a fourth control valve; 322. a third regulating valve; 330. a first branch pipe; 331. a fifth control valve; 332. a sixth pressure sensor; 333. a first one-way valve; 340. a second branch pipe; 341. a sixth control valve; 342. a seventh pressure sensor; 343. a second one-way valve; 400. a shielding gas purge module; 410. a shielding gas supply device; 420. a shielding gas supply pipe; 421. a seventh control valve; 5. a gas fuel manifold; 6. a liquid fuel manifold.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

It should be noted that, in the description of the present application, the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, it should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale, e.g., the thickness or width of some layers may be exaggerated relative to other layers for ease of description.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined or illustrated in one figure, no further detailed discussion or description thereof will be necessary in the following description of the figures.

As shown in FIG. 1, the present application provides an embodiment of a gas turbine fuel supply system, the system comprising: a gas fuel supply module 100, a liquid fuel supply module 200, a compressed air purge module 300, and a shielding gas purge module 400, wherein the gas fuel supply module 100 is configured to supply gas fuel to a gas turbine; the liquid fuel supply module 200 is used 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 gaseous fuel supply module 100; the shielding gas purge module 400 is used for cleaning the gas fuel supply module 100.

Specifically, in the embodiment of the present application, the gaseous fuel supply module 100 may be any fuel supply module disclosed in the market, and is not limited in any way; the liquid fuel supply module 200 may be any fuel supply module disclosed in the market, and is not limited in any way; the compressed air purge module 300 is a module capable of being purged by compressed air as the name implies; the shielding gas purging module 400 is a module that can purge by shielding gas as the name implies.

It should be clear that after the fuel switch, the dual-fuel gas turbine needs to clean the non-working fuel supply module by gas to prevent the gas fuel from being present in the gas fuel supply module 100 to cause safety accidents such as explosion, or the liquid fuel from being present in the liquid fuel supply module 200 to cause coking to block the pipeline or the nozzle. In the operation process of the dual-fuel gas turbine, the nozzle corresponding to the non-operating fuel supply module is in a high-temperature and high-pressure combustion environment for a long time, and continuous ventilation cooling is also required for prolonging the service life of the nozzle. Thus, it is readily appreciated that the present application breaks down purging of a non-operating fuel supply module into two steps, cleaning and cooling.

Specifically, if the dual fuel gas turbine is switched from liquid fuel to gas fuel, that is, the inactive fuel supply module is the liquid fuel supply module 200, the liquid fuel supply module 200 may be cleaned and cooled only by the compressed air purge module 300; if the dual-fuel gas turbine is switched from gas fuel to liquid fuel, that is, if the inactive fuel supply module is the gas fuel supply module 100, the gas fuel supply module 100 may be cleaned by the shielding gas purge module 400, and then the gas fuel supply module 100 may be cooled by the compressed air purge module 300.

In the examples of the present application, the shielding gas refers to any gas that does not undergo chemical reactions such as combustion with a gaseous fuel, for example: if the gas fuel is natural gas, the shielding gas may be selected as an inert gas, or to reduce the cost of use, the shielding gas may be selected as nitrogen.

It should be clear that, in the embodiment of the present application, when the gas fuel supply module 100 is purged, the gas fuel supply module 100 is cleaned by the shielding gas purge module 400, and the shielding gas does not undergo chemical reactions such as combustion with the gas fuel, so that phenomena such as explosion do not occur, and the gas fuel supply module 100 is not damaged. And after the cleaning of the shielding gas purging module 400 is completed, the compressed air purging module 300 is adopted to continuously cool the shielding gas purging module 400, so that the acquisition cost of the compressed air is relatively low compared with the acquisition cost of the shielding gas, and the use cost is further saved.

In one embodiment of the present application, as shown in fig. 2 and 3, the gaseous fuel supply module 100 includes: a gaseous fuel supply 110, a gaseous fuel supply pipe 120, a gaseous diffusion pipe 130, a first valve assembly and a second valve assembly. Wherein a first end of the gas fuel supply pipe 120 is communicated with the gas fuel supply device 110, and a second end of the gas fuel supply pipe 120 is communicated with the gas fuel main pipe 5, that is, the gas fuel supply device 110 is conveyed to the gas fuel main pipe 5 through the gas fuel supply pipe 120, that is, the gas fuel supply pipe 120 can be any type of pipeline capable of conveying gas fuel; the gas fuel supply apparatus 110 is a well-established technology in the art, and thus will not be described in detail; the first end of the gas diffusion tube 130 is in communication with the gas fuel supply tube 120, and the gas diffusion tube 130 is mainly used for discharging the gas fuel in the gas fuel supply tube 120, so that the gas diffusion tube 130 is not limited at all, and can be a pipe with any shape or structure; the first valve assembly is at least for controlling the opening and closing of the gaseous fuel supply pipe 120; the second valve assembly is used at least to control the opening and closing of the gas diffusion tube 130.

In one embodiment of the present application, as shown in FIG. 3, the first valve assembly includes a first control valve 121 disposed in a gaseous fuel supply line 120; the second valve assembly includes a second control valve 132 disposed in the gas diffusion tube 130. If it is desired to deliver gaseous fuel to the gaseous fuel manifold 5 through the gaseous fuel supply apparatus 110, the first control valve 121 is opened and the second control valve 132 is closed; if it is desired to diffuse the gaseous fuel in the gaseous fuel supply pipe 120 through the gaseous diffusion pipe 130, the second control valve 132 is opened, and the first control valve 121 is closed.

Specifically, in the embodiments of the present application, the control valve refers to any valve capable of controlling opening and closing of a pipe, for example: the first control valve 121, the second control valve 132, the third control valve 221, and the like, hereinafter. It will be readily appreciated that the control valve may be any type of valve, for example: the valve can be a valve which is manually controlled to be opened and closed, can be an electrically controlled to be opened and closed, and can also be a valve which is hydraulically, pneumatically, turbine, pneumatic and hydraulic, spur gear and bevel gear to be controlled to be opened and closed; which may be a gate valve, shut-off valve, plug valve, ball valve, butterfly valve, or the like.

In a specific embodiment of the present application, all control valves use shut-off valves in order to ensure a good tightness of the valve.

It should be clear that when purging a non-operational fuel supply module, it is necessary to ensure that the pressure of the purge gas is greater than the combustion pressure in the combustion chamber. If the pressure of the purge gas is less than the combustion pressure in the combustion chamber, the high-temperature and high-pressure combustion gas easily flows backward to the non-operating fuel supply module, thereby damaging the non-operating fuel supply module.

To avoid backflow of high temperature and high pressure gas in the combustion chamber to the gas fuel supply pipe 120 or leakage of the gas fuel, and damage to the gas fuel supply pipe 120, in one embodiment of the present application, the first valve assembly further includes a first temperature sensor 122, a first quick disconnect valve 123, and a second quick disconnect valve 124 provided to the gas fuel supply pipe 120; the first temperature sensor 122 is mainly used for monitoring the temperature inside the gas fuel supply pipe 120, and if the temperature exceeds the standard, it indicates that a safety accident may occur, for example: the high-temperature and high-pressure gas located in the combustion chamber flows backward, or the gas fuel in the gas fuel supply apparatus 110 leaks, and the gas fuel in the gas fuel supply pipe 120 is exploded, etc.; the first speed cut valve 123 and the second speed cut valve 124 are mainly used to cut off the gas fuel supply pipe 120.

Specifically, as shown in fig. 2, in the present embodiment, the first control valve 121, the first temperature sensor 122, the first speed cut-off valve 123, and the second speed cut-off valve 124 are arranged in this order in a first direction from the first end of the gas fuel supply pipe 120 toward the second end, and the gas bleeding pipe 130 is located between the first speed cut-off valve 123 and the second speed cut-off valve 124. That is, if an accident occurs in the gas fuel supply pipe 120, the gas fuel supply pipe 120 can be quickly shut off by the first speed shut-off valve 123 and the second speed shut-off valve 124, and at the same time, the dangerous gas between the first speed shut-off valve 123 and the second speed shut-off valve 124 can be discharged by the gas discharge pipe 130, so that a safety zone where secondary combustion cannot be formed is formed in the middle of the gas fuel supply pipe 120, and further expansion of the safety accident can be avoided.

It is clear that when the gas turbine is in operation, if too much fuel is fed into the combustion chamber, combustion deterioration is easy to occur, and overload trip is caused in severe cases; if too little fuel enters the combustion chamber, the gas turbine is liable to be insufficiently powered. Thus, in one embodiment of the present application, as shown in fig. 3, the first valve assembly further includes a first pressure sensor 125, a first regulating valve 126, and a second pressure sensor 127 provided to the gas fuel supply pipe 120, and the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 are sequentially arranged in the first direction. It should be clear that, in the embodiments of the present application, the sequential arrangement in a certain direction does not mean that the respective components are aligned in a straight line. For example: if the gas fuel supply pipe 120 is a straight pipe, the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 may be regarded as being aligned in the first direction, and if the gas fuel supply pipe 120 is a curved pipe, the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 may be regarded as being aligned in the first direction, but the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 may not be connected in a straight line.

In the present embodiment, the pre-valve pressure of the first regulator valve 126 is monitored by the first pressure sensor 125, the post-valve pressure of the first regulator valve 126 is monitored by the second pressure sensor 127, and the amount of fuel entering the combustion chamber can be accurately regulated and controlled based on the difference between the pre-valve and the post-valve pressures of the first regulator valve 126 in combination with the opening degree of the first regulator valve 126.

It should be clear that in the embodiments of the present application, the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 may be located at any position in the gas fuel supply pipe 120, but the gas fuel has a pressure drop when supplied, so that in order to more precisely control the fuel amount of the gas fuel, the first pressure sensor 125, the first regulating valve 126, and the second pressure sensor 127 are located close to the gas fuel manifold 5 when provided, as shown in fig. 3.

The regulating valve in the embodiment of the present application refers to a valve capable of regulating its own opening, for example: a first regulator valve 126, and a second regulator valve 226 and a third regulator valve 322, etc., hereinafter. The valve can be any valve with the opening capable of being adjusted, and the type of the valve is not limited, for example: an electric control valve or a pneumatic control valve.

It should be appreciated that if a burnout or an excessive gas pressure occurs in the gas fuel supply pipe 120, damage to the gas fuel supply pipe 120 or various valves is easily caused, and in order to reduce the risk, in a specific embodiment of the present application, as shown in fig. 3, the second valve assembly further includes a bleed valve 131 disposed in the gas bleed pipe 130, and the bleed valve 131 and the second control valve 132 are sequentially arranged along a second direction, which is directed from the first end to the second end of the gas bleed pipe 130.

Specifically, the purge valve is a safety valve, and when the pressure inside the gas fuel supply pipe 120 exceeds a set value for some temporary reason, a certain amount of gas can be discharged through the purge valve 131 to lower the pressure in the gas fuel supply pipe 120, thereby protecting the gas fuel supply pipe 120 and various valves.

In one embodiment of the present application, as shown in fig. 3, a shielding gas purge module 400 includes: a shielding gas supply apparatus 410, a shielding gas supply pipe 420, and a seventh control valve 421, wherein the shielding gas supply apparatus 410 may be any apparatus capable of generating a shielding gas of a certain pressure, for example: the shielding gas supply apparatus 410 may be a tank for storing shielding gas, the shielding gas having a certain pressure being obtained by heating the tank; the first end of the shielding gas supply pipe 420 communicates with the shielding gas supply apparatus 410, and the second end of the shielding gas supply pipe 420 communicates with the gas fuel supply pipe 120, that is, the shielding gas supply apparatus 410 delivers shielding gas to the gas fuel supply pipe 120 through the shielding gas supply pipe 420; the seventh control valve 421 is provided to the shielding gas supply pipe 420 for controlling the opening or closing of the shielding gas supply pipe 420.

In another embodiment of the present application, to enable the gas fuel supply pipe 120 located between the first quick disconnect valve 123 and the second quick disconnect valve 124 to quickly form a safety segment, a shielding gas supply pipe 420 is located between the first quick disconnect valve 123 and the second quick disconnect valve 124 as shown in fig. 3.

After the description of the gas fuel supply module 100 and the shielding gas purge module 400 in the embodiments of the present application is made, the description of the liquid fuel supply module 200 in the embodiments of the present application is focused below.

Specifically, as shown in fig. 3, the liquid fuel supply module 200 includes: a liquid fuel supply apparatus 210, a liquid fuel supply pipe 220, a third valve assembly, and a return pipe assembly; the liquid fuel supply device 210 is a mature prior art, and therefore, will not be described in detail; the first end of the liquid fuel supply pipe 220 communicates with the liquid fuel supply apparatus 210, and the second end of the liquid fuel supply pipe 220 communicates with the liquid fuel manifold 6, that is, the liquid fuel supply apparatus 210 supplies the liquid fuel to the liquid fuel manifold 6 through the liquid fuel supply pipe 220. It is to be readily understood that the liquid fuel supply pipe 220 need only have a liquid fuel delivery function, and in the embodiment of the present application, there is no limitation in shape and configuration thereof. The third valve assembly includes a third control valve 221 provided to the liquid fuel supply pipe 220; the third valve assembly is at least for controlling the opening and closing of the liquid fuel supply pipe 220; the return line assembly is used to return the liquid fuel supply line 220.

For reasons similar to those described above, in order to avoid too much or too little fuel entering the combustion chamber, in one embodiment of the present application, as shown in fig. 3, the third valve assembly further includes a fourth pressure sensor 225, a second regulator valve 226, and a fifth pressure sensor 228 provided to the liquid fuel supply pipe 220, the third control valve 221, the fourth pressure sensor 225, the second regulator valve 226, and the fifth pressure sensor 228 being sequentially arranged in a third direction, the third direction being directed from the first end to the second end of the liquid fuel supply pipe 220.

Specifically, the pre-valve pressure of the second regulator valve 226 is monitored by the fourth pressure sensor 225, the post-valve pressure of the second regulator valve 226 is monitored by the fifth pressure sensor 228, and the opening degree of the second regulator valve 226 is adjusted based on the pre-valve and post-valve pressure difference of the second regulator valve 226, so that the fuel amount of the liquid fuel entering the combustion chamber is more accurate.

It should be clear that, since the second regulator valve 226 is a precision device, if the liquid fuel pressure in the second regulator valve 226 is too large, damage to the second regulator valve 226 is liable to occur. Thus, in one embodiment of the present application, the third valve assembly further comprises a fourth quick disconnect valve 224 and a fifth quick disconnect valve 227 disposed in the liquid fuel supply pipe 220, the fourth quick disconnect valve 224, the second regulator valve 226, and the fifth quick disconnect valve 227 being arranged in sequence along the third direction.

Specifically, as shown in fig. 3, if the pre-valve pressure of the second regulator valve 226 is too high, the fourth speed cut valve 224 is closed to prevent the liquid fuel having too high a pressure from damaging the second regulator valve 226; if the post-valve pressure of the second regulator valve 226 is too high, for example: the fifth quick disconnect valve 227 is closed to prevent the second regulator valve 226 from being damaged by the backward flow of the high-temperature and high-pressure fuel in the combustion chamber.

For the reasons similar to the above, in order to prevent the liquid fuel supply pipe 220 or the respective valves from being damaged by the high-temperature and high-pressure fuel gas in the combustion chamber flowing backward into the liquid fuel supply pipe 220 or other abnormal reasons, etc., in one embodiment of the present application, the third valve assembly further includes a second temperature sensor 222 and a third pressure sensor 223 provided to the liquid fuel supply pipe 220, and the third control valve 221, the second temperature sensor 222, the third pressure sensor 223, the fourth quick disconnect valve 224, the fourth pressure sensor 225, the second regulating valve 226, the fifth quick disconnect valve 227, and the fifth pressure sensor 228 are sequentially arranged in the third direction.

Specifically, the second temperature sensor 222 and the third pressure sensor 223 monitor the conditions in the liquid fuel supply pipe 220 in real time, and perform relevant regulation based on the monitoring results of the second temperature sensor 222 and the third pressure sensor 223, so as to prevent various safety accidents from expanding.

It should be appreciated that in the embodiment of the present application, as shown in fig. 3, the oil return pipe assembly includes 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 quick disconnect 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 quick disconnect valve 227; a third return line 260 is located between the fifth quick disconnect valve 227 and the fifth pressure sensor 228. That is, the first return pipe 240 serves to recover the liquid fuel between the fourth quick disconnect valve 224 and the fourth pressure sensor 225; the second oil return pipe 250 is used for recovering the liquid fuel between the second regulating valve 226 and the fifth quick-break valve 227; the third return line 260 is used to recover liquid fuel between the fifth quick disconnect valve 227 and the fifth pressure sensor 228.

After describing the liquid fuel supply module 200 of the present embodiment, the compressed air purge module 300 of the present embodiment is described below with emphasis.

Specifically, as shown in fig. 3, the compressed air purge module 300 includes: a compressed air supply 310, a compressed air supply pipe 320, a first sub-pipe 330, a second sub-pipe 340, and a fourth valve assembly. Wherein the compressed air supply apparatus 310 is used for storing and supplying compressed air, it is easy to think that the compressed air supply apparatus 310 may be any apparatus, for example: the compressed air supply device 310 may be composed of one or several compressors and associated gas cylinders, the set pressure value of the gas cylinders should be higher than the working pressure of the combustion chamber, and the compressors are operated according to the set pressure value to ensure a sufficient purge amount. In particular, considering the pressure drop of the compressed air in the gas fuel supply pipe 120 or the liquid fuel supply pipe 220, the ratio of the pressure of the gas cylinder to the pressure after the normal operation of the combustion chamber is k, which must be greater than 1. It should be clear that if the k value is less than or equal to 1, the combustion gas of the combustion chamber must flow backward into the fuel supply module due to the pressure drop, and if the k value is large, the acquisition cost is high, and the purging of the fuel supply module is damaged due to the excessively high pressure of the compressed air. In a specific embodiment of the present application, k is greater than or equal to 2.0 and less than or equal to 5.0, and specifically, k may be any one of 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 and 5.0, or any value between the two adjacent values. The first end of the compressed air supply pipe 320 is connected to the compressed air supply device 310, and the second end of the compressed air supply pipe 320 extends out of the first branch pipe 330 and the second branch pipe 340, wherein the first branch pipe 330 is used for being communicated with the gas fuel supply pipe 120, and the second branch pipe 340 is used for being communicated with the liquid fuel supply pipe 220, that is, the compressed air supply device 310 transmits compressed air to the gas fuel supply pipe 120 through the compressed air supply pipe 320 and the first branch pipe 330, and the compressed air supply device 310 transmits compressed air to the liquid fuel supply pipe 220 through the compressed air supply pipe 320 and the second branch pipe 340.

Specifically, the fourth valve assembly is at least for controlling the opening and closing of the compressed air supply pipe 320, the first sub-pipe 330 and the second sub-pipe 340, as shown in fig. 3, and includes: a fourth control valve 321 provided to the compressed air supply pipe 320; a fifth control valve 331 provided to the first sub-pipe 330; a sixth control valve 341 provided in the second branch pipe 340.

It should be clear from the foregoing that if the pressure of the compressed gas in the first branch pipe 330 or the second branch pipe 340 is smaller than the pressure of the gas in the combustion chamber, the nozzle cannot be purged and cooled. Thus, in one embodiment of the present application, as shown in FIG. 3, the fourth valve assembly further includes a third regulator valve 322 disposed in the compressed air supply pipe 320.

In particular, since gas turbine speed and power are positively correlated with pressure in the combustor. Accordingly, the opening degree of the third regulating valve 322 may be set based on the gas turbine speed or power, ensuring the pressure of the compressed air for purging.

It should be clear that, in order to avoid that the gas pressure in the combustion chamber is excessively high and flows backward into the first branch pipe 330, in one embodiment of the present application, as shown in fig. 3, the fourth valve assembly further includes a sixth pressure sensor 332 and a first check valve 333 provided to the first branch pipe 330, and the fifth control valve 331, the sixth pressure sensor 332 and the first check valve 333 are sequentially arranged along the gas flow direction in the first branch pipe 330, which means the direction in which the compressed air flows from the compressed air supply apparatus 310 to the gas fuel supply pipe 120. The provision of the first check valve 333 can effectively prevent the gas in the combustion chamber from flowing backward to the first branch pipe 330.

For similar reasons as described above, in another embodiment of the present application, the fourth valve assembly further includes a seventh pressure sensor 342 and a second check valve 343 provided to the second sub-pipe 340, and the sixth control valve 341, the seventh pressure sensor 342 and the second check valve 343 are sequentially arranged along the direction of the air flow in the second sub-pipe 340.

It should be clear that the gas turbine may vibrate during operation, and in order to avoid damage to the connection between the gas fuel supply pipe 120 or the liquid fuel supply pipe 220 and the gas turbine due to the rigid connection, fuel leakage may occur due to light weight, and safety accidents may occur due to heavy weight. In one embodiment of the present application, as shown in FIG. 3, the second end of the gas fuel feed 120 is connected to the gas fuel manifold 5 by a first hose 140, and the second end of the liquid fuel feed 220 is connected to the liquid fuel manifold 6 by a second hose 230. In particular, since the use environments of the first and second hoses 140 and 230 are high temperature environments, the first and second hoses 140 and 230 may be selected as metal hoses in order to allow the first and second hoses 140 and 230 to have a long service life.

The gas turbine fuel supply system in the above embodiment adopts the shielding gas purging module to clean the gas fuel supply module, and the shielding gas and the gas fuel do not have chemical reactions such as combustion, so the gas fuel supply module is not damaged due to phenomena such as explosion. And after the cleaning of the protective gas purging module is completed, the compressed air purging module is used for continuously cooling the protective gas purging module, so that the acquisition cost of the compressed air is relatively low relative to the acquisition cost of the protective gas, and the use cost is further saved.

Having described embodiments of a gas turbine fuel supply system in the present application, embodiments of a gas turbine set forth in the present application are described below.

Specifically, the gas turbine in the embodiments of the present application has the gas turbine fuel supply system as set forth in any one of the embodiments described above, that is, the gas turbine employs the gas turbine fuel supply system disclosed in the embodiments of the present application.

The gas turbine in the above embodiment cleans the gas fuel supply module by using the shielding gas purge module, and the shielding gas and the gas fuel do not undergo chemical reactions such as combustion, so that phenomena such as explosion and the like do not occur to damage the gas fuel supply module. And after the cleaning of the protective gas purging module is completed, the compressed air purging module is used for continuously cooling the protective gas purging module, so that the acquisition cost of the compressed air is relatively low relative to the acquisition cost of the protective gas, and the use cost is further saved.

After describing embodiments of the gas turbine in the present application, embodiments of the gas turbine fuel supply method set forth in the present application are described below.

Specifically, the gas turbine fuel supply method according to the embodiment of the present application uses the gas turbine fuel supply system as set forth in any one of the embodiments described above, that is, the gas turbine fuel supply method uses the gas turbine fuel supply system disclosed in the embodiment of the present application for fuel supply.

In one particular embodiment of the present application, a gas turbine fuel delivery method includes: cleaning the gas fuel supply module 100 based on the shielding gas purge module 400; cleaning and cooling the liquid fuel supply module 200 based on the compressed air purge module 300; the gaseous fuel supply module 100 is cooled based on the compressed air purge module 300.

Specifically, before the gas turbine uses the gas fuel, it is necessary to open the seventh control valve 421 and purge the gas fuel supply pipe 120 with the shielding gas by the shielding gas supply apparatus 410, to prevent the gas fuel from remaining in the gas fuel supply pipe 120 to cause the explosion.

Specifically, when the gas turbine does not burn the gas fuel, the first speed cut-off valve 123 and the second speed cut-off valve 124 of the gas fuel supply module 100 are normally closed, and the bleed valve 131 and the second control valve 132 are normally open, so that if the gas fuel supply pipe 120 contains dangerous gas, the dangerous gas can be discharged in time. When the gas turbine burns the gas fuel, the first control valve 121 is opened, when the gas turbine is started to the air supply rotating speed, the first quick disconnect valve 123 and the second quick disconnect valve 124 are opened, the relief valve 131, the second control valve 132 and the seventh control valve 421 are closed, the first regulating valve 126 is controlled to work according to the given fuel supply rule, and the gas fuel enters the combustion chamber through the first quick disconnect valve 123 and the second quick disconnect valve 124, the first regulating valve 126, the first hose 140 and the gas fuel main pipe 5; during the increasing or decreasing load of the gas turbine, the first regulating valve 126 meters 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 engine is stopped, the first quick disconnect valve 123 and the second quick disconnect valve 124 are closed, the purge valve 131 and the second control valve 132 are opened, and the gas fuel between the first quick disconnect valve 123 and the second quick disconnect valve 124 is discharged to a safety region, so that the subsequent explosion is prevented.

Specifically, when the gas turbine does not burn liquid fuel, the fourth speed cut-off valve 224 and the fifth speed cut-off 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, and when the gas turbine starts to the oil supply rotating speed, the fourth speed cut-off valve 224 and the fifth speed cut-off valve 227 are opened, the second regulating valve 226 is controlled to work according to a given fuel supply rule, and the liquid fuel enters the combustion chamber through the fourth speed cut-off valve 224 and the fifth speed cut-off valve 227, the second regulating valve 226, the second hose 230 and the liquid fuel main pipe 6; during the load increasing or decreasing process of the gas turbine, the second regulating valve 226 measures the required fuel according to the pressure of working medium before and after the valve and the temperature of the working medium, and controls the fuel to enter the combustion chamber; if the engine is stopped, the fourth speed cut-off valve 224 and the fifth speed cut-off valve 227 are closed, and the liquid fuel in the liquid fuel supply pipe 220 is returned to the oil source through the oil return pipe assembly.

Specifically, the compressed air purge module 300 is used to purge a non-operating fuel supply module. When the gas engine is operated, the fourth control valve 321 is opened, the pressure of the compressed air is regulated by the third regulating valve 322, the fifth control valve 331 is used for controlling the purge gas to the gas fuel supply pipe 120, the sixth control valve 341 is used for controlling the purge gas to the liquid fuel supply pipe 220, and the first check valve 333 and the second check valve 343 are used for preventing the high-temperature and high-pressure gas generated by combustion from flowing back into the compressed air purge module 300.

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

Claims (18)

1. A gas turbine fuel supply system, comprising:

a gas fuel supply module (100) for supplying gas fuel to the 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 gaseous fuel supply module (100);

and the shielding gas purging module (400) is used for cleaning the gas fuel supply module (100).

2. The gas turbine fuel supply system of claim 1, wherein the gas fuel supply module (100) comprises:

a gaseous fuel supply apparatus (110);

a gaseous fuel supply pipe (120) having a first end in communication with the gaseous fuel supply (110) and a second end in communication with the gaseous fuel manifold (5);

A gas diffusion tube (130) having a first end in communication with the gas fuel supply tube (120);

a first valve assembly for controlling at least the opening and closing of said gaseous fuel supply pipe (120);

and a second valve assembly at least for controlling the opening and closing of the gas diffusion tube (130).

3. The gas turbine fuel supply system of claim 2, wherein the first valve assembly comprises a first control valve (121) disposed to the gas fuel supply pipe (120); the second valve assembly includes a second control valve (132) disposed in the gas dispersion tube (130).

4. A gas turbine fuel supply system according to claim 3, wherein the first valve assembly further comprises a first temperature sensor (122), a first speed break valve (123) and a second speed break valve (124) arranged in the gas fuel supply pipe (120), the first control valve (121), the first temperature sensor (122), the first speed break valve (123) and the second speed break valve (124) being arranged in sequence in a first direction, the first direction being directed from a first end of the gas fuel supply pipe (120) to a second end, the gas bleed pipe (130) being located between the first speed break valve (123) and the second speed break valve (124).

5. A gas turbine fuel supply system according to claim 3, wherein the first valve assembly further comprises a first pressure sensor (125), a first regulator valve (126) and a second pressure sensor (127) arranged in the gas fuel supply pipe (120), the first pressure sensor (125), the first regulator valve (126) and the second pressure sensor (127) being arranged in sequence along a first direction.

6. A gas turbine fuel supply system according to claim 3, wherein the second valve assembly further comprises a bleed valve (131) provided to the gas bleed duct (130), the bleed valve (131) and the second control valve (132) being arranged in sequence in a second direction, the second direction being directed from the first end of the gas bleed duct (130) to the second end.

7. The gas turbine fuel supply system of any one of claims 2 to 6, wherein the shielding gas purge module (400) comprises:

a shielding gas supply device (410);

a shielding gas supply pipe (420) having a first end in communication with the shielding gas supply apparatus (410) and a second end in communication with the gas fuel supply pipe (120);

and a seventh control valve (421) provided in the shielding gas supply pipe (420).

8. The gas turbine fuel supply system of any one of claims 2 to 6, wherein the liquid fuel supply module (200) comprises:

a liquid fuel supply device (210);

a liquid fuel supply pipe (220) having a first end communicating with the liquid fuel supply device (210) and a second end communicating with the liquid fuel manifold (6);

a third valve assembly for controlling at least the opening and closing of the liquid fuel supply pipe (220);

and the oil return pipe assembly is used for returning oil to the liquid fuel supply pipe (220).

9. The gas turbine fuel supply system of claim 8, wherein the third valve assembly includes a third control valve (221) disposed in the liquid fuel supply pipe (220).

10. The gas turbine fuel supply system of claim 9, wherein the third valve assembly further comprises a fourth pressure sensor (225), a second regulator valve (226), and a fifth pressure sensor (228) disposed in the liquid fuel supply pipe (220), the third control valve (221), the fourth pressure sensor (225), the second regulator valve (226), and the fifth pressure sensor (228) being arranged in sequence along a third direction, the third direction being directed from the first end to the second end of the liquid fuel supply pipe (220).

11. The gas turbine fuel supply system of claim 10, wherein the third valve assembly further comprises a fourth quick disconnect valve (224) and a fifth quick disconnect valve (227) disposed in the liquid fuel supply pipe (220), the fourth quick disconnect valve (224), the second regulator valve (226), and the fifth quick disconnect valve (227) being arranged in sequence along a third direction.

12. The gas turbine fuel supply system of claim 11, wherein the third valve assembly further comprises 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 disconnect valve (224), the fourth pressure sensor (225), the second regulator valve (226), the fifth quick disconnect valve (227), and the fifth pressure sensor (228) being arranged in order along a third direction.

13. The gas turbine fuel supply system of claim 12, wherein the oil return pipe assembly includes 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 quick disconnect valve (224) and the fourth pressure sensor (225); the second oil return pipe (250) is positioned between the second regulating valve (226) and the fifth quick-break valve (227); the third oil return pipe (260) is positioned between the fifth quick disconnect valve (227) and the fifth pressure sensor (228).

14. The gas turbine fuel supply system of claim 8, wherein the compressed air purge module (300) comprises:

a compressed air supply device (310);

-a compressed air supply pipe (320), a first end of which is in communication with the compressed air supply device (310), and a second end of which extends out of a first branch pipe (330) and a second branch pipe (340), wherein the first branch pipe (330) is adapted to communicate with the gaseous fuel supply pipe (120); -said second branch pipe (340) being adapted to communicate with said liquid fuel supply pipe (220);

and a fourth valve assembly for controlling at least opening and closing of the compressed air supply pipe (320), the first sub-pipe (330) and the second sub-pipe (340).

15. The gas turbine fuel supply system of claim 14, wherein the fourth valve assembly comprises:

a fourth control valve (321) provided to the compressed air supply pipe (320);

a fifth control valve (331) provided to the first branch pipe (330);

and a sixth control valve (341) provided in the second branch pipe (340).

16. The gas turbine fuel supply system of claim 15, wherein the fourth valve assembly further comprises a third regulator valve (322) disposed to the compressed air supply pipe (320).

17. The gas turbine fuel supply system of claim 15, wherein the fourth valve assembly further comprises a sixth pressure sensor (332) and a first check valve (333) disposed in the first sub-pipe (330), the fifth control valve (331), the sixth pressure sensor (332), and the first check valve (333) being arranged in sequence along a direction of gas flow in the first sub-pipe (330); and/or a seventh pressure sensor (342) and a second one-way valve (343) which are arranged on the second branch pipe (340), wherein the sixth control valve (341), the seventh pressure sensor (342) and the second one-way valve (343) are sequentially arranged along the airflow direction in the second branch pipe (340).

18. A gas turbine having a gas turbine fuel supply system as claimed in any one of claims 1 to 17.