CN212408280U - Gas supply system - Google Patents

Abstract

The utility model relates to an air supply system, which comprises an air supply unit and an air return unit; the gas supply unit comprises a gas supply pipeline, a temperature sensor and a first on-off device, wherein the temperature sensor is used for detecting the temperature of gas in the gas supply pipeline; the first on-off device is used for opening and closing the gas supply pipeline; the air return unit comprises an air return pipeline, an air return storage tank and a second on-off device, and the air inlet end of the air return pipeline is connected to the air supply pipeline; the air return storage tank is connected with an air outlet end of the air return pipeline; the second on-off device is used for opening and closing the air return pipeline; the first and second switching devices are both controlled by a temperature sensor. The utility model uses the temperature sensor to detect the gas temperature in the gas supply pipeline; and the temperature sensor is used for controlling the first on-off device and the second on-off device to work, so that the gas which does not reach the preset temperature threshold value is automatically recycled by the gas return unit in the debugging stage of the gas supply system, and the energy waste and potential safety hazard caused by local emptying are avoided.

Description

Gas supply system

Technical Field

The utility model relates to a gas air supply system technical field, in particular to air supply system.

Background

In recent years, with the further spread of clean energy, more and more projects adopt power stations of LPG gas turbines. However, in the use process of the gas turbine, the temperature of the gas entering the gas turbine has strict range requirements, the temperature of the gas entering the gas turbine needs to be continuously debugged before the traditional gas turbine power station is debugged in the initial stage and starts to operate, and in the debugging or maintenance process, the gas which does not reach the temperature requirements needs to be accessed to a safe place for discharging in place for many times, so that energy waste and certain potential safety hazards exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an air supply system to when debugging this air supply system, effectively solve the extravagant problem of gas and eliminate the potential safety hazard.

In order to solve the technical problem, the utility model adopts the following technical scheme:

according to an aspect of the utility model, the utility model provides an air supply system, this air supply system includes: an air supply unit comprising: the gas supply pipeline is used for conveying gas, the gas inlet end of the gas supply pipeline is connected with a gas supply source, and the gas outlet end of the gas supply pipeline is connected with a gas inlet of the gas turbine; the temperature sensor is arranged on the gas supply pipeline and close to the gas outlet end of the gas supply pipeline and is used for detecting the temperature of the gas in the gas supply pipeline; the first on-off device is arranged on the gas supply pipeline, is positioned at the downstream of the temperature sensor and is used for opening and closing the gas supply pipeline; and an air return unit including: the air inlet end of the air return pipeline is connected to the air supply pipeline between the temperature sensor and the first on-off device; the gas return storage tank is connected with the gas outlet end of the gas return pipeline and is used for recovering the gas entering the gas return pipeline; the second on-off device is arranged on the air return pipeline and used for opening and closing the air return pipeline; wherein the first and second on-off devices are both controlled by the temperature sensor.

In some embodiments of the present application, the gas supply system further comprises a controller, the controller being electrically connected to the temperature sensor, the first on-off device and the second on-off device, respectively.

In some embodiments of the present application, the first on-off device includes a first pneumatic cut-off valve and a first solenoid valve; the first pneumatic cut-off valve is arranged on the gas supply pipeline and is controlled by the first electromagnetic valve; the first electromagnetic valve is controlled by the temperature sensor.

In some embodiments of the present application, the second interrupter member includes a second pneumatic trip valve and a second solenoid valve; the second pneumatic cut-off valve is arranged on the air return pipeline and is controlled by the second electromagnetic valve; the second solenoid valve is controlled by the temperature sensor.

According to some embodiments of the present application, an air return valve is respectively disposed on the air return pipeline upstream and downstream of the first on-off device.

In some embodiments of the present application, the gas supply duct includes a gas supply main pipe and a plurality of gas supply branch pipes; the gas supply main pipe is used for being connected with a gas supply source; the plurality of air supply branch pipes are respectively connected with the air supply main pipe; the temperature sensors and the first on-off devices are arranged in plurality and are correspondingly arranged on the gas supply branch pipe; the air return pipeline comprises an air return main pipe and a plurality of air return branch pipes; the air return main pipe is connected with the air return storage tank; the plurality of air return branch pipes are respectively connected with the air return main pipe, and the air return branch pipes are correspondingly connected with the air supply branch pipes; the second interrupter member is provided in plurality and corresponds to the return branch pipe.

According to some embodiments of the present application, an air intake valve is provided on the air supply duct upstream and downstream of the first on-off device, respectively.

In some embodiments of the present application, the gas supply unit further comprises a bypass duct; two ends of the bypass pipeline are respectively connected with the gas supply pipeline, and the bypass pipeline is connected with the first on-off device in parallel; the bypass pipeline is provided with a bypass valve for opening and closing the bypass pipeline.

In some embodiments of the present application, the gas supply system further comprises an evacuation unit comprising an evacuation pipe and an evacuation valve; one end of the emptying pipeline is connected to the gas supply pipeline, and the other end of the emptying pipeline is empty and used for discharging gas in emergency or during gas maintenance; the emptying valve is arranged on the emptying pipeline and used for opening and closing the emptying pipeline.

According to the above technical scheme, the embodiment of the utility model provides an at least have following advantage and positive effect:

the air supply system of the embodiment of the utility model is additionally provided with the air return unit on the basis of the original air supply unit; the gas supply unit comprises a gas supply pipeline, and a temperature sensor and a first on-off device which are arranged on the gas supply pipeline, wherein the temperature sensor is used for detecting the temperature of gas in the gas supply pipeline; the air return unit comprises an air return pipeline, a second on-off device and an air return storage tank, and the air return storage tank is used for recovering fuel gas. In the debugging stage of the gas supply system, if the temperature of the gas does not reach the preset temperature threshold value, the gas supply pipeline can be closed by using the first on-off device, and the gas return pipeline is opened by opening the second on-off device, so that the gas which does not reach the preset temperature enters the gas return storage tank through the gas return pipeline for recycling; meanwhile, the gas temperature of the front-end gas supply source can be adjusted conveniently until the preset temperature threshold is reached. In the repeated debugging process, the gas which does not reach the preset temperature threshold can be automatically recovered by utilizing the gas return unit, so that the energy waste and the potential safety hazard caused by local emptying are avoided.

In addition, at the pre-operation stage of the gas supply system, the gas supply system can be used for ensuring that the temperature of the gas entering the gas turbine reaches the preset temperature threshold value, automatically recovering the gas which does not reach the preset temperature threshold value, being convenient for heating the gas at a gas supply source, finally reaching the preset temperature threshold value and ensuring that the gas turbine normally and efficiently operates.

Drawings

Fig. 1 is a schematic structural diagram of an air supply system according to an embodiment of the present invention.

Fig. 2 is a control schematic diagram of an air supply system according to an embodiment of the present invention.

The reference numerals are explained below:

100. a gas supply source; 200. a gas turbine;

1. an air supply unit; 11. a gas supply duct; 111. a main gas supply pipe; 112. a gas supply branch pipe; 12. a temperature sensor; 13. a first on-off device; 131. a first pneumatic shut-off valve; 132. a first pneumatic actuator; 133. a first solenoid valve; 14. a first intake valve; 15. a second intake valve; 16. a bypass conduit; 17. a bypass valve;

2. an air return unit;

21. a return air duct; 211. a main air return pipe; 212. a return air branch pipe; 22. a return air storage tank; 23. a second on-off device; 231. a second pneumatic cut-off valve; 232. a second pneumatic actuator; 233. a second solenoid valve; 24. a first air return valve; 25. a second air return valve;

3. a controller;

4. emptying the pipeline; 41. and an evacuation valve.

Detailed Description

Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In recent years, with the further spread of plot energy, more and more projects adopt power stations of LPG gas turbines. However, in the use process of the gas turbine, the temperature of the gas entering the gas turbine has strict range requirements, the temperature of the gas entering the gas turbine needs to be continuously debugged before the traditional gas turbine power station is debugged in the initial stage and starts to operate, and in the debugging or maintenance process, the gas which does not reach the temperature requirements needs to be accessed to a safe place for discharging in place for many times, so that energy waste and certain potential safety hazards exist.

Referring to fig. 1 and 2, an air supply system according to an embodiment of the present invention may be adapted to supply air to a gas turbine, and form a gas turbine power plant with the gas turbine using the air supply system. The air supply system may include an air supply unit 1, an air return unit 2, and a controller 3. The air supply unit 1 is used for connecting the front end air supply source 100 and the rear end gas turbine 200, and delivering the gas of the air supply source 100 into the gas turbine 200 to supply the gas to the gas turbine 200. The gas return unit 2 is connected with the gas supply unit 1 and arranged corresponding to the gas supply unit 1 for recovering the fuel gas. The controller 3 is electrically connected with the air supply unit 1 and the air return unit 2 respectively and is used for controlling the air supply unit 1 and the air return unit 2 to work cooperatively respectively.

It should be noted that the air supply source 100 at the front end of the air supply unit 1 may be an air supply system, which is used for pre-treating the fuel gas, such as adjusting the temperature and flow rate of the fuel gas. The gas source system can comprise an LPG vaporizer, a gas storage tank for stabilizing pressure and the like. After being pretreated at the gas supply source 100, the fuel gas is delivered to the corresponding gas turbine 200 through the gas supply system of the embodiment to work, so as to ensure that the gas turbine 200 operates normally and efficiently.

Referring to fig. 1, the air supply unit 1 includes an air supply duct 11, a temperature sensor 12, and a first on-off device 13.

The gas supply pipeline 11 is used for conveying gas, the gas inlet end of the gas supply pipeline 11 is used for being connected with a gas supply source 100, and the gas outlet end of the gas supply pipeline 11 is used for being connected with the gas inlet of the gas turbine 200.

In some embodiments, the gas supply duct 11 may include a gas supply main 111 and a plurality of gas supply branch pipes 112. The main gas supply pipe 111 is used for connecting with the gas supply source 100. The plurality of air supply branch pipes 112 are arranged at intervals and respectively supply air to a gas turbine 200. One end of each of the branch air supply pipes 112 is connected to the main air supply pipe 111, and the other end of each of the branch air supply pipes 112 is connected to an air inlet of a gas turbine 200. That is, a main gas supply pipe 111 is matched with a plurality of branch gas supply pipes 112, so that the gas supply system can simultaneously supply gas for a plurality of gas turbines 200, and finally, an integrally connected and centrally controlled gas turbine power plant can be formed.

The temperature sensor 12 is provided on the air supply branch pipe 112 of the air supply duct 11, and is close to the air outlet end of the air supply branch pipe 112. The temperature sensor 12 is used to detect the temperature of the gas in the gas supply branch 112 to determine whether the temperature of the gas at the inlet of the gas turbine 200 meets the temperature requirement.

In some embodiments, an in situ displayed temperature gauge may be provided on the manifold 112 at the temperature sensor 12. The thermometer can be used for displaying the temperature detected by the corresponding temperature sensor 12, so as to facilitate field debugging and observation.

The first on-off device 13 is provided on the gas supply branch pipe 112, and is located on the gas supply branch pipe 112 downstream of the temperature sensor 12. The first on-off device 13 is used to open and close the corresponding gas supply branch pipe 112 to control whether the gas in the corresponding gas supply branch pipe 112 enters the corresponding gas turbine 200.

The first switching device 13 is controlled by the temperature sensor 12. When the temperature detected by the temperature sensor 12 reaches a preset temperature threshold value, the first on-off device 13 is turned on, and the gas supply branch pipe 112 normally delivers gas for the gas turbine 200.

In some embodiments, the first on-off device 13 comprises a first pneumatic shut-off valve 131, a first pneumatic actuator 132 and a first solenoid valve 133.

The first pneumatic cutoff valves 131 are provided on the corresponding gas supply branch pipes 112. The pneumatic element of the first pneumatic actuator 132 may extend into the first pneumatic shut-off valve 131 to block the first pneumatic shut-off valve 131, or may be withdrawn from the first pneumatic shut-off valve 131 to open the first pneumatic shut-off valve 131. The port of the first solenoid valve 133 is connected to the first pneumatic actuator 132.

When the corresponding valve port of the first solenoid valve 133 is opened, compressed air may enter the first pneumatic actuator 132, thereby driving the pneumatic elements of the first pneumatic actuator 132 into the first pneumatic trip valve 131 to block the first pneumatic trip valve 131. When the corresponding valve port of the first solenoid valve 133 is closed, the pneumatic element of the first pneumatic actuator 132 is withdrawn from the first pneumatic cutoff valve 131, thereby opening the first pneumatic cutoff valve 131. The first solenoid valve 133 controls the opening and closing of the first pneumatic shutoff valve 131, so as to realize the opening and closing function of the gas supply branch pipe 112.

In some embodiments, a first intake valve 14 and a second intake valve 15 are provided on the air supply branch pipe 112 upstream and downstream of the first opening/closing device 13, respectively. The first intake valve 14 and the second intake valve 15 may be both manual valves. In debugging or maintenance, the gas supply branch pipes 112 upstream and downstream of the first opening/closing member 13 can be closed by closing the first and second gas intake valves 14 and 15, so that the first opening/closing member 13 can be individually disassembled for maintenance.

In some embodiments, a bypass duct 16 connected in parallel with the first on-off device 13 is also provided on the gas supply branch 112; both ends of the bypass duct 16 are connected to the air supply branch pipes 112 upstream and downstream of the first on-off device 13, respectively, and the bypass duct 16 is provided with a bypass valve 17 for opening and closing the bypass duct 16. When the pipeline is tested, replaced or overhauled, the bypass valve 17 can be opened under the closing state of the first on-off device 13, and the pipeline is tested and replaced at the downstream pipe section of the first on-off device 13.

Still referring to fig. 1, the return air unit 2 includes a return air duct 21, a return air tank 22, and a second interrupter member 23.

The gas return pipeline 21 is used for recovering fuel gas which does not meet the temperature requirement. The air inlet end of the air return pipeline 21 is connected to the air supply pipeline 11 between the temperature sensor 12 and the first on-off device 13, and the air outlet end of the air return pipeline 21 is used for being connected with the air return storage tank 22.

In some embodiments, return air duct 21 may include a return main 211 and a plurality of return air branch pipes 212. The return main pipe 211 is connected to the return storage tank 22. The return air branch pipes 212 are arranged corresponding to the supply air branch pipes 112, respectively. One end of each return air branch pipe 212 is connected to the supply air branch pipe 112 and is connected to the supply air branch pipe 112 between the temperature sensor 12 and the first on-off device 13. The other ends of the return branch pipes 212 are connected to the return main pipe 211, respectively. That is, the gas return main pipe 211 is engaged with the plurality of gas return branch pipes 212, so that the gas that does not reach the temperature requirement in the plurality of gas supply branch pipes 112 can be recovered through the corresponding gas return branch pipes 212 and the gas return main pipe 211.

The return air storage tank 22 is connected with the air outlet end of the return air pipeline 21. For example, the return gas storage tank 22 is connected to the gas outlet end of the return gas main pipe 211, and is used for recycling the fuel gas entering the return gas pipe 21.

A second on-off device 23 is provided on return manifold 212. The second on-off means 23 is used to open and close the corresponding return manifold 212.

The second switching device 23 is controlled by the temperature sensor 12. When the temperature detected by the temperature sensor 12 does not reach the preset temperature threshold, the first on-off device 13 is closed, the second on-off device 23 is opened, and the fuel gas which does not reach the temperature standard is recovered to the return gas storage tank 22 through the return gas branch pipe 212.

In some embodiments, the second interrupter member 23 includes a second pneumatic trip valve 231, a second pneumatic actuator 232, and a second solenoid valve 233.

The second pneumatic cutoff valves 231 are provided on the corresponding return manifolds 212. The pneumatic element of the second pneumatic actuator 232 may extend into the second pneumatic cutoff valve 231 to block the second pneumatic cutoff valve 231, or withdraw from the second pneumatic cutoff valve 231 to open the second pneumatic cutoff valve 231. The valve port of the second solenoid valve 233 is connected to the second pneumatic actuator 232.

When the corresponding valve port of the second solenoid valve 233 is opened, compressed air may enter the second pneumatic actuator 232, thereby driving the pneumatic element of the second pneumatic actuator 232 to block the second pneumatic cutoff valve 231. When the corresponding port of the second solenoid valve 233 is closed, the pneumatic element of the second pneumatic actuator 232 is withdrawn from the second pneumatic cutoff valve 231, thereby opening the second pneumatic cutoff valve 231. The second solenoid valve 233 controls the opening and closing of the second pneumatic cutoff valve 231, thereby implementing the opening and closing function of the return branch pipe 212.

In some embodiments, a first air return valve 24 and a second air return valve 25 are provided on the air return branch 212 upstream and downstream of the second interrupter member 23, respectively. Both the first air return valve 24 and the second air return valve 25 can adopt manual valves. In the case of commissioning or maintenance, the return branch 212 upstream and downstream of the second on-off device 23 can be closed by closing the first return valve 24 and the second return valve 25, so that the second on-off device 23 can be separately disassembled for maintenance.

Referring to fig. 2 in conjunction with fig. 1, the controller 3 is electrically connected to the temperature sensors 12 of the air supply branch pipes 112, respectively, to receive the temperature signals detected by the temperature sensors 12.

The controller 3 is also electrically connected to the first on-off device 13 on each of the air supply branch pipes 112 and the second on-off device 23 on each of the air return branch pipes 212, respectively. Such as electrically controlled connections with the first solenoid valve 133 of the first on-off device 13 and the second solenoid valve 233 of the second on-off device 23, respectively.

The controller 3 can control the first on-off device 13 in the air supply branch pipe 112 and the second on-off device 23 on the corresponding air return branch pipe 212 to operate according to the comparison between the temperature signal corresponding to the temperature sensor 12 in the air supply branch pipe 112 and the preset temperature threshold value of the air in the air supply branch pipe 112.

For example, when the temperature of the gas detected by the temperature sensor 12 in the gas supply branch pipe 112 reaches a preset temperature threshold value of the gas in the gas supply branch pipe 112, the first on-off device 13 in the gas supply branch pipe 112 is controlled to be opened, and the second on-off device 23 in the corresponding gas return branch pipe 212 is controlled to be closed. The gas in the branch gas supply pipe 112 is normally supplied to the corresponding gas turbine 200.

Meanwhile, when the temperature of the gas detected by the temperature sensor 12 in the gas supply branch pipe 112 does not reach the preset temperature threshold of the gas in the gas supply branch pipe 112, the first on-off device 13 in the gas supply branch pipe 112 is controlled to be closed, and the second on-off device 23 in the corresponding gas return branch pipe 212 is controlled to be opened. The gas in the gas supply branch pipe 112 is recovered by entering the return gas storage tank 22 through the corresponding return gas branch pipe 212.

Still referring to fig. 1, in some embodiments, the gas supply system may further comprise an evacuation unit comprising an evacuation pipe 4 and an evacuation valve 41 provided on the evacuation pipe 4.

The plurality of evacuation pipes 4 may be provided, and the evacuation pipes 4 are provided in one-to-one correspondence with the gas supply branch pipes 112. One end of the evacuation pipeline 4 is connected to the gas supply branch pipe 112, and the other end of the evacuation pipeline 4 is vacant, and is used for discharging gas in emergency or during gas maintenance, and conveying the gas in the gas supply branch pipe 112 to a specified position for discharging. The evacuation valve 41 is correspondingly disposed on the evacuation pipe 4, and is used for opening and closing the corresponding evacuation pipe 4.

In the debugging or maintenance phase, if a certain gas supply branch pipe 112 needs to be disassembled, the first on-off device 13 and the second on-off device 23 can be closed, and then the evacuation valve 41 is opened, so that the residual gas in the gas supply branch pipe 112 is discharged to a designated position or space through the evacuation pipeline 4, and potential safety hazards are eliminated.

Based on the above gas supply system, the embodiment of the present invention further provides a gas supply method for supplying gas to the gas turbine 200. The gas supply method comprises the following steps:

the real-time temperature of the gas in the gas supply duct 11 is detected.

If the real-time temperature of the gas reaches the preset temperature threshold, the first on-off device 13 is turned on and the second on-off device 23 is turned off, so that the gas in the gas supply pipeline 11 is normally delivered to supply gas to the gas turbine 200.

If the real-time temperature of the fuel gas does not reach the preset temperature threshold, the first on-off device 13 is closed and the second on-off device 23 is opened, so that the fuel gas which does not reach the temperature standard in the gas supply pipeline 11 enters the gas return storage tank 22 through the gas return pipeline 21 for recovery. Meanwhile, the temperature of the gas at the side of the gas supply source 100 can be automatically adjusted until the real-time temperature of the gas in the gas supply pipeline 11 reaches a preset temperature threshold value, and then the first on-off device 13 is turned on and the second on-off device 23 is turned off to supply gas to the gas turbine 200 again, so that the gas turbine 200 can be ensured to operate normally and efficiently.

Based on the technical scheme, the embodiment of the utility model provides an at least, following advantage and positive effect have:

the air supply system of the embodiment of the utility model is additionally provided with the air return unit 2 on the basis of the original air supply unit 1; the gas supply unit 1 comprises a gas supply pipeline 11, a temperature sensor 12 and a first on-off device 13, wherein the temperature sensor 12 is arranged on the gas supply pipeline 11 and is used for detecting the temperature of gas in the gas supply pipeline 11; the air return unit 2 comprises an air return pipeline 21, a second on-off device 23 and an air return storage tank 22, and the air return storage tank 22 is used for recovering fuel gas. In the debugging stage of the gas supply system, if the gas temperature does not reach the preset temperature threshold value, the gas supply pipeline 11 can be closed by using the first on-off device 13, and the gas return pipeline 21 is opened by opening the second on-off device 23, so that the gas which does not reach the preset temperature enters the gas return storage tank 22 through the gas return pipeline 21 for recycling; meanwhile, the gas temperature of the front-end gas supply source 100 can be adjusted conveniently until the preset temperature threshold is reached. In the repeated debugging process, the gas which does not reach the preset temperature threshold can be automatically recovered by the gas return unit 2, so that the energy waste and the potential safety hazard caused by local emptying are avoided.

In addition, in the operation stage of the gas supply system, the gas supply system can be further used for ensuring that the temperature of the gas entering the gas turbine 200 reaches the preset temperature threshold value, the gas which does not reach the preset temperature threshold value is automatically recycled, the temperature of the gas can be conveniently increased at the gas supply source 100, the preset temperature threshold value is finally reached, and the gas turbine 200 is ensured to normally and efficiently operate.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (9)

1. An air supply system, comprising:

an air supply unit comprising:

the gas supply pipeline is used for conveying gas, the gas inlet end of the gas supply pipeline is connected with a gas supply source, and the gas outlet end of the gas supply pipeline is connected with a gas inlet of the gas turbine;

the temperature sensor is arranged on the gas supply pipeline and close to the gas outlet end of the gas supply pipeline and is used for detecting the temperature of the gas in the gas supply pipeline;

the first on-off device is arranged on the gas supply pipeline, is positioned at the downstream of the temperature sensor and is used for opening and closing the gas supply pipeline;

an air return unit comprising:

the air inlet end of the air return pipeline is connected to the air supply pipeline between the temperature sensor and the first on-off device;

the gas return storage tank is connected with the gas outlet end of the gas return pipeline and is used for recovering the gas entering the gas return pipeline;

the second on-off device is arranged on the air return pipeline and used for opening and closing the air return pipeline;

wherein the first and second on-off devices are both controlled by the temperature sensor.

2. An air supply system as claimed in claim 1, further comprising a controller in electrically controlled connection with the temperature sensor, the first and second switch members, respectively.

3. The gas supply system according to claim 1, wherein the first on-off means comprises a first pneumatic shut-off valve and a first solenoid valve; the first pneumatic cut-off valve is arranged on the gas supply pipeline and is controlled by the first electromagnetic valve; the first electromagnetic valve is controlled by the temperature sensor.

4. The gas supply system of claim 1, wherein the second interrupter member comprises a second pneumatic trip valve and a second solenoid valve; the second pneumatic cut-off valve is arranged on the air return pipeline and is controlled by the second electromagnetic valve; the second solenoid valve is controlled by the temperature sensor.

5. The air supply system according to claim 1, wherein an air return valve is provided on the air return duct upstream and downstream of the first on-off device, respectively.

6. The gas supply system of claim 1, wherein the gas supply duct comprises a gas supply main and a plurality of gas supply branch ducts; the gas supply main pipe is used for being connected with a gas supply source; the plurality of air supply branch pipes are respectively connected with the air supply main pipe; the temperature sensors and the first on-off devices are arranged in plurality and are correspondingly arranged on the gas supply branch pipe;

the air return pipeline comprises an air return main pipe and a plurality of air return branch pipes; the air return main pipe is connected with the air return storage tank; the plurality of air return branch pipes are respectively connected with the air return main pipe, and the air return branch pipes are correspondingly connected with the air supply branch pipes; the second interrupter member is provided in plurality and corresponds to the return branch pipe.

7. The air supply system according to claim 1, wherein an air intake valve is provided on the air supply duct upstream and downstream of the first on-off device, respectively.

8. The gas supply system of claim 1, wherein the gas supply unit further comprises a bypass duct;

two ends of the bypass pipeline are respectively connected with the gas supply pipeline, and the bypass pipeline is connected with the first on-off device in parallel;

the bypass pipeline is provided with a bypass valve for opening and closing the bypass pipeline.

9. The gas supply system of claim 1, further comprising an evacuation unit comprising an evacuation conduit and an evacuation valve;

one end of the emptying pipeline is connected to the gas supply pipeline, and the other end of the emptying pipeline is empty and used for discharging gas in emergency or during gas maintenance;

the emptying valve is arranged on the emptying pipeline and used for opening and closing the emptying pipeline.

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