Gas supply system and method of gas supply

Abstract

The application provides a gas supply system and a gas supply method. The gas supply system comprises: a gas inlet end of a main gas supply module for inputting fuel gas, a main gas supply end of the main gas supply module being in communication with a gas using device; a standby gas supply port of a standby module being selectively in communication with or disconnected from the gas using device; when the standby module is in a pre-warning state, at least part of the standby module is used for pre-treating fuel to be treated in the standby module to obtain available fuel, and the standby gas supply port is disconnected from the gas using device; when the standby module is in a gas supply state, the standby gas supply port is in communication with the gas using device to input the available fuel into the gas using device; and a first pressure detection member is used for detecting a pressure value at the gas using device, so that the standby module is in the pre-warning state or the gas supply state according to a detection result of the first pressure detection member. Through the technical scheme provided by the application, the technical problem that standby fuel cannot be quickly cut into gas supply in the prior art can be solved.

Description

Technical Field

[0001] This invention relates to the field of gas supply system technology, and more specifically, to a gas supply system and gas supply method. Background Technology

[0002] Currently, wellhead gas is natural gas produced directly from the wellhead and undergoes simple processing. In actual operations, wellhead gas is a fuel with significant potential due to its economic advantages and abundant supply. However, since wellhead gas is mostly produced directly from the wellhead, its parameters such as pressure, flow rate, temperature, and gas quality are affected by the gas reservoir, wellhead type, extraction technology, wellhead processing facilities, and operating status. Once the fluctuation range of any parameter exceeds the allowable lower limit of the gas-using equipment, it will cause the terminal equipment to alarm or shut down, or even lead to the termination of operations. For gas turbines and similar gas-using equipment, the application of wellhead gas requires fuel gas with corresponding matching flow rate, pressure, temperature, and gas quality, which contradicts the tendency of wellhead gas to fluctuate. Therefore, gas-using equipment using wellhead gas as its fuel source usually needs to be equipped with backup fuel to supply gas to the equipment when wellhead gas fluctuates.

[0003] However, when using more economical gaseous fuels or easily vaporized liquid fuels (such as LNG) as backup fuel, the need for vaporization or depressurization before supplying the equipment results in a longer gas supply switchover time. This prevents the backup fuel from quickly and stably supplying gas, and the timing of wellhead gas instability is difficult to predict accurately. For gas turbine power generation and similar gas-fired internal combustion engine fracturing scenarios, fuel switching typically needs to be completed within 180 seconds after wellhead gas instability occurs. However, for conventional LNG / LPG (liquefied natural gas / liquefied petroleum gas) vaporization supply and CNG (compressed natural gas) depressurization supply, due to the characteristics of LNG vaporization and CNG depressurization equipment, the time from decision to start-up to operation takes approximately 5–30 minutes. This means that when wellhead gas fluctuations occur, the gaseous backup fuel or easily vaporized liquid backup fuel cannot quickly reach a usable state and complete the fuel switchover, affecting the normal operation of the equipment. Summary of the Invention

[0004] The main objective of this invention is to provide a gas supply system and gas supply method to solve the technical problem in the prior art that backup fuel cannot be quickly switched into the gas supply.

[0005] To achieve the above objectives, according to one aspect of the present invention, a gas supply system is provided, comprising:

[0006] The main gas supply module has an inlet end for introducing fuel gas and a main gas supply end for connecting to gas-consuming equipment.

[0007] The backup module has a backup gas supply port that can be selectively connected to or disconnected from the gas-consuming equipment. The backup module has an early warning state and a gas supply state. When the backup module is in the early warning state, at least a portion of the backup module is used to pre-treat the fuel to be processed in the backup module to obtain usable fuel, and the backup gas supply port is disconnected from the gas-consuming equipment. When the backup module is in the gas supply state, it supplies usable fuel to the gas-consuming equipment, and the backup gas supply port is connected to the gas-consuming equipment.

[0008] The first pressure detection element is used to detect the pressure value at the gas-consuming equipment, so that the standby module is in a warning state or in a gas supply state according to the detection result of the first pressure detection element.

[0009] Furthermore, the gas supply system also includes a second pressure detection element, which is used to detect the pressure value of the fuel gas in the main gas supply module, so as to connect or disconnect the main gas supply terminal from the gas-consuming equipment according to the detection result of the second pressure detection element; and / or,

[0010] The backup module includes a fuel storage unit and a processing unit, which are connected in communication. The fuel storage unit is used to store fuel to be processed, and the processing unit forms at least part of the backup module.

[0011] Furthermore, the main gas supply module includes:

[0012] A first buffer element is disposed between the air inlet end and the main air supply end; the first buffer element has a first buffer chamber for containing fuel gas; and / or,

[0013] A first switching valve, located at the main gas supply end, is used to control the connection or disconnection between the main gas supply end and the gas-consuming equipment; and / or

[0014] A first check valve is located at the main gas supply end; and / or,

[0015] The gas treatment unit is located between the gas inlet and the main gas supply end. The gas treatment unit is used to process the fuel gas.

[0016] Furthermore, the backup module includes:

[0017] A second switching valve is installed at the standby gas supply port. This second switching valve is used to connect or disconnect the standby gas supply port from the gas-consuming equipment; and / or...

[0018] A third pressure sensor is used to detect the pressure of the fuel gas flowing from the backup module, so as to connect or disconnect the backup gas supply port from the gas-consuming equipment based on the detection result of the third pressure sensor; and / or,

[0019] The second check valve is located at the backup gas supply port.

[0020] Furthermore, the backup module includes:

[0021] The second buffer element has a second buffer chamber for containing fuel gas.

[0022] The processing unit forms at least part of the backup module, and the second buffer is disposed between the processing unit and the backup air supply port;

[0023] The fourth pressure detection element is connected to the second buffer element to detect the pressure of the fuel gas inside the second buffer element.

[0024] Furthermore, the backup module also includes:

[0025] A relief valve is provided, which is connected to a second buffer element; and / or,

[0026] The first root valve is disposed between the fourth pressure sensing element and the second buffer element; and / or,

[0027] The third check valve is located between the second buffer and the processing unit.

[0028] Furthermore, the backup module includes a processing component, which forms at least a portion of the backup module; the backup module also includes:

[0029] A pressure regulating component, connected to the processing unit, is used to regulate the pressure of the fuel gas flowing out of the processing unit; and / or,

[0030] Vent valve, the vent valve is connected to the processing unit.

[0031] According to another aspect of the present invention, a gas supply method is provided, which is applicable to the gas supply system provided above. The gas supply method includes a main gas supply process, which includes:

[0032] Obtain the pressure value of the fuel gas at the gas-using equipment;

[0033] The backup module of the gas supply system is either in an early warning state or in a gas supply state based on the pressure value of the fuel gas at the gas-consuming equipment.

[0034] Furthermore, before obtaining the pressure value of the fuel gas at the gas-consuming equipment, the main gas supply process also includes:

[0035] Detect the pressure value within the backup module;

[0036] When the pressure value in the backup module is lower than the preset lower limit of gas consumption, at least a portion of the fuel to be processed in the backup module is pre-treated to increase the pressure value in the backup module.

[0037] When the pressure value inside the backup module is greater than or equal to the preset buffer upper limit, the backup module is depressurized to reduce the pressure value inside the backup module.

[0038] When the pressure value in the standby module is greater than or equal to the preset lower limit of gas consumption and less than the preset upper limit of buffer, the main gas supply module of the gas supply system is connected to the gas-consuming equipment.

[0039] Furthermore, based on the pressure value of the fuel gas at the gas-consuming equipment, the standby module of the gas supply system is put into an early warning state or into a gas supply state, including:

[0040] Obtain preset warning values ​​and preset switching values;

[0041] Compare the pressure value of the fuel gas at the gas-using equipment with the preset warning value;

[0042] When the pressure of the fuel gas at the gas-using equipment is greater than or equal to the preset warning value, at least part of the standby module will stop pre-processing the fuel to be processed.

[0043] When the pressure of fuel gas at the gas-consuming equipment is lower than the preset warning value, the standby module is put into the warning state and the standby module enters the standby gas supply process.

[0044] The backup gas supply process includes: comparing the pressure value of the fuel gas at the gas-consuming equipment with a preset switching value; disconnecting the backup module from the gas-consuming equipment when the pressure value of the fuel gas at the gas-consuming equipment is greater than or equal to the preset switching value; putting the backup module into gas supply mode when the pressure value of the fuel gas at the gas-consuming equipment is less than the preset switching value; and setting a preset warning value greater than the preset switching value.

[0045] Furthermore, after the backup module is put into gas supply mode when the pressure of the fuel gas at the gas-consuming equipment is lower than the preset switching value, the backup gas supply process also includes:

[0046] Disconnect the main gas supply module of the gas supply system from the gas-consuming equipment; and / or,

[0047] Make the air supply pressure of the backup module greater than that of the main air supply module.

[0048] Furthermore, the gas supply method also includes obtaining the lower limit value of the gas supply pressure PCL of the standby module and the preset value PC of the gas supply pressure of the standby module, such that PCL ≤ PC < PA, where PA is the preset value of the gas supply pressure when the main gas supply module normally supplies gas to the gas-consuming equipment; and / or,

[0049] Obtain preset warning values ​​and preset switching values, including:

[0050] Obtain the lower limit of gas consumption (PAL) for gas-consuming equipment and the lower limit of gas supply (PBL) for the main gas supply module of the gas supply system;

[0051] Get the preset switching value PLL, PLL = max|K1·PAL, K3·PBL|, K1≥0, K3≥0;

[0052] Obtain the preset warning value PL, PL=max|K2·PLL,PLL+PT|,K2≥0,PT is the gas pressure value of the fuel gas in the gas-consuming equipment that decreases within the time range of switching from the warning state to the gas supply state when the backup module supplies gas to the gas-consuming equipment alone.

[0053] Furthermore, the backup gas supply process also includes:

[0054] Detect the pressure value of the fuel gas in the main gas supply module of the gas supply system;

[0055] When the pressure of the fuel gas in the main gas supply module is lower than the preset switching value, the main gas supply module is disconnected from the gas-consuming equipment.

[0056] When the pressure of the fuel gas in the main gas supply module is greater than or equal to the preset switching value, the main gas supply module is connected to the gas-consuming equipment, and the standby module is disconnected from the gas-consuming equipment.

[0057] Furthermore, after disconnecting the main gas supply module from the gas-consuming equipment, the gas supply method also includes:

[0058] Get the pressure value within the backup module and the preset buffer limit value;

[0059] When the pressure value in the backup module is less than the preset buffer upper limit, at least part of the backup module pre-processes the fuel to be processed in the backup module and enters the backup gas supply process.

[0060] When the pressure value in the standby module is greater than or equal to the preset buffer upper limit, at least part of the standby module stops pre-processing the fuel to be processed and enters the main gas supply process.

[0061] Further, obtain the preset buffer upper limit value, including:

[0062] Obtain the safety pressure value (PH) within the backup module;

[0063] Get the preset buffer upper limit value PHH, and make PHH < PH.

[0064] By applying the technical solution of this invention, the pressure value at the gas-consuming device can be detected by a first pressure detection element. When the pressure value at the gas-consuming device drops to a certain preset value, at least a portion of the backup module is activated to pre-treat the fuel to be processed in the backup module to obtain usable fuel that can be directly used by the gas-consuming device. Simultaneously, the backup gas supply port is disconnected from the gas-consuming device, ensuring that the pre-treatment operation in the backup module does not affect the normal gas supply from the main gas supply module to the gas-consuming device. When the pressure value at the gas-consuming device drops to a preset limit value, the backup gas supply port is connected to the gas-consuming device to introduce the pre-treated usable fuel. With this configuration, when the main gas supply module encounters a problem supplying gas to the gas-consuming device, since the backup module already has pre-treated usable fuel, the gas supply system can directly connect the backup module and the gas-consuming device, supplying gas to the gas-consuming device with the usable fuel from the backup module. This enables rapid switching of gas supply between the main gas supply module and the backup module without waiting for the backup module to pre-treat the fuel after switching. Therefore, the technical solution of the present invention can solve the technical problem that backup fuel cannot be quickly switched into gas supply in the prior art. Attached Figure Description

[0065] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0066] Figure 1 A schematic diagram of the overall structure of the gas supply system provided according to Embodiment 1 of the present invention is shown;

[0067] Figure 2 A schematic diagram of the main gas supply module provided according to Embodiment 1 of the present invention is shown;

[0068] Figure 3 A schematic diagram of the main gas supply module provided according to Embodiment 2 of the present invention is shown;

[0069] Figure 4 A schematic diagram of the main gas supply module provided according to Embodiment 3 of the present invention is shown;

[0070] Figure 5 A schematic diagram of the main gas supply module provided according to Embodiment 4 of the present invention is shown;

[0071] Figure 6 A schematic diagram of the structure of the backup module provided according to Embodiment 1 of the present invention is shown;

[0072] Figure 7 A schematic diagram of the structure of the second buffer and the pressure regulating component of the backup module provided according to Embodiment 1 of the present invention is shown;

[0073] Figure 8 A schematic diagram of the structure of the second buffer and the pressure regulating component of the backup module provided according to Embodiment 5 of the present invention is shown;

[0074] Figure 9 A schematic diagram of the overall structure of the gas supply system provided according to Embodiment Six of the present invention is shown;

[0075] Figure 10 A schematic diagram of the overall structure of the gas supply system provided according to Embodiment Seven of the present invention is shown;

[0076] Figure 11 A schematic diagram of the overall structure of the gas supply system provided according to Embodiment 8 of the present invention is shown;

[0077] Figure 12 A schematic flow diagram of the main gas supply process according to Embodiment 9 of the present invention is shown;

[0078] Figure 13 A schematic diagram of the overall flow of the gas supply method provided according to Embodiment 9 of the present invention is shown.

[0079] The above figures include the following reference numerals:

[0080] 10. Main gas supply module; 11. Second pressure detection element; 111. Third root valve; 12. First buffer element; 13. First switching valve; 14. First check valve; 15. Gas treatment unit;

[0081] 20. Backup module; 21. Fuel storage unit; 22. Processing unit; 23. Second switching valve; 24. Third pressure detection unit; 241. Fourth root valve; 25. Second check valve; 26. Second buffer unit; 27. Fourth pressure detection unit; 28. Relief valve; 281. Fifth root valve; 29. ​​First root valve; 210. Third check valve; 211. Pressure regulating unit; 212. Venting valve; 213. Backup relief valve; 214. Interface;

[0082] 30. First pressure detection element; 31. Second root valve;

[0083] 40. Control components;

[0084] 50. Access point;

[0085] 60. Connect to the outlet. Detailed Implementation

[0086] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0087] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, Embodiment 1 of the present invention provides a gas supply system, which includes a main gas supply module 10, a backup module 20, and a first pressure detection element 30. The inlet of the main gas supply module 10 is used to introduce fuel gas, and the main gas supply end of the main gas supply module 10 is configured to be connected to a gas-consuming device. The backup gas supply port of the backup module 20 can be selectively connected to or disconnected from the gas-consuming device; the backup module 20 has a warning state and a gas supply state; when the backup module 20 is in the warning state, at least a portion of the backup module 20 is used to pre-treat the fuel to be processed in the backup module 20 to obtain usable fuel, and the backup gas supply port is disconnected from the gas-consuming device; when the backup module 20 is in the gas supply state, the backup gas supply port is connected to the gas-consuming device to introduce usable fuel into the gas-consuming device. The first pressure detection element 30 is used to detect the pressure value at the gas-consuming device, so that the backup module 20 is either in the warning state or in the gas supply state according to the detection result of the first pressure detection element 30.

[0088] Using the gas supply system provided in Embodiment 1 of the present invention, the pressure value at the gas-consuming device can be detected by the first pressure detection element 30. When the pressure value at the gas-consuming device drops to a certain preset value, at least a portion of the backup module 20 is activated to pre-process the fuel to be processed in the backup module 20 to obtain usable fuel that can be directly used by the gas-consuming device. At the same time, the backup gas supply port is disconnected from the gas-consuming device so that the pre-processing operation in the backup module 20 does not affect the normal gas supply from the main gas supply module 10 to the gas-consuming device. When the pressure value at the gas-consuming device drops to a preset limit value, the backup gas supply port is connected to the gas-consuming device to introduce the pre-processed usable fuel into the gas-consuming device. With this configuration, when the main gas supply module 10 encounters a gas supply problem to the gas-consuming equipment, the backup module 20, which already contains pre-treated fuel, allows the gas supply system to directly connect the backup module 20 and the gas-consuming equipment. The available fuel in the backup module 20 then supplies gas to the equipment, enabling a rapid switchover between the main gas supply module 10 and the backup module 20 without waiting for the backup module 20 to pre-treat the fuel after the switch. Therefore, the gas supply system provided in this embodiment solves the technical problem in the prior art where backup fuel cannot quickly switch into the gas supply.

[0089] Specifically, the inlet of the main gas supply module 10 is used to introduce wellhead gas. Specifically, the fuel to be processed in the backup module 20 is liquefied natural gas, liquefied petroleum gas, or compressed natural gas.

[0090] Specifically, "gas-consuming equipment location" refers to the location within the gas-consuming equipment or the connection point where the gas-consuming equipment is connected to both the main gas supply module 10 and the backup module 20.

[0091] Specifically, the first pressure detection element 30 is installed at the gas-using equipment to facilitate the detection of the pressure value at the gas-using equipment.

[0092] Specifically, the first pressure sensing element 30 includes a second root valve 31. The second root valve 31 allows the first pressure sensing element 30 to be removed for calibration or maintenance without venting the gas in the gas supply system pipeline.

[0093] In this embodiment, the gas supply system also includes a control component 40, and the first pressure detection component 30, the main gas supply module 10, and the backup module 20 are all connected to the control component 40. With this structural arrangement, the switching between the main gas supply module 10 and the backup module 20 can be controlled by the control component 40.

[0094] Specifically, the main gas supply module 10 is provided with an inlet 50 for introducing wellhead gas at its inlet end. The inlet 50 can be a pipe, joint, flange, equipment, or component between the gas well and the main gas supply module 10.

[0095] Specifically, the gas supply system also includes an outlet 60, which is used to connect to the gas-consuming equipment to supply gas from the main gas supply module 10 or the backup module 20 to the gas-consuming equipment.

[0096] Specifically, such as Figure 2 As shown, the gas supply system also includes a second pressure detection element 11, which is used to detect the pressure value of the fuel gas in the main gas supply module 10, so as to connect or disconnect the main gas supply terminal from the gas-consuming equipment according to the detection result of the second pressure detection element 11. With this structural arrangement, the connection or disconnection between the main gas supply terminal and the gas-consuming equipment can be controlled by detecting the pressure value of the fuel gas in the main gas supply module 10 through the second pressure detection element 11. Specifically, the main gas supply terminal and the gas-consuming equipment can be selectively connected or disconnected.

[0097] Specifically, the second pressure sensing element 11 includes a third root valve 111. The third root valve 111 allows the second pressure sensing element 11 to be removed for calibration or maintenance without having to vent the wellhead gas in the pipeline of the main gas supply module 10.

[0098] In this embodiment, as Figure 6 As shown, the backup module 20 includes a fuel storage unit 21 and a processing unit 22, which are connected in communication. The fuel storage unit 21 stores fuel to be processed, and the processing unit 22 forms at least a part of the backup module 20. With this structure, the fuel to be processed can be stored in the fuel storage unit 21, and the communication between the fuel storage unit 21 and the processing unit 22 allows the processing unit 22 to preprocess the fuel stored in the fuel storage unit 21.

[0099] Specifically, when LNG or LPG and similar gasified fuels are used as the fuel to be processed in the backup module 20, the fuel storage unit 21 can be an LNG tank truck, a storage tank, or a container or object with similar functions. When CNG or similar compressed fuels (such as H2, biomass gas, or other gaseous fuels) are used as the fuel to be processed in the backup module 20, the fuel storage unit 21 is a backup fuel storage device, a vehicle / sled, or an object with similar functions. When liquid fuels (such as conventional diesel, gasoline, or crude oil) are used as the fuel to be processed in the backup module 20, the fuel storage unit 21 is a container, tank, or vehicle with storage functions. In some scenarios where the backup fuel consumption is very small, the fuel storage unit 21 can be an interface for connecting to external backup fuel supply equipment (such as tank trucks, storage tanks, and other components with similar storage tank functions).

[0100] Specifically, when LNG or LPG or similar gasified fuels are used as the fuel to be processed in the backup module 20, the processing unit 22 can be one of a gasification skid / cart, a gasifier, or other components or equipment with a gasification function. When CNG or similar compressed fuels (such as H2, biomass gas, or other gaseous fuels) are used as the fuel to be processed in the backup module 20, the processing unit 22 is one of a depressurization skid / cart or other components or equipment with a depressurization function.

[0101] In this embodiment, as Figure 2 As shown, the main gas supply module 10 also includes a first one-way valve 14, which is located at the main gas supply end. This structural arrangement ensures that gas can only flow from the main gas supply module 10 to the gas-consuming equipment and cannot flow back, thus effectively guaranteeing the normal operation of the main gas supply module 10.

[0102] Specifically, such as Figure 2 As shown, the main gas supply module 10 also includes a gas treatment unit 15, which is located between the gas inlet and the main gas supply end. The gas treatment unit 15 is used to process the fuel gas. Specifically, the gas treatment unit 15 is used to process the wellhead gas to facilitate the application of the wellhead gas by gas-using equipment.

[0103] like Figure 3 and Figure 5As shown in Embodiments 2 and 4 of the present invention, the main gas supply module 10 includes a first switching valve 13, which is located at the main gas supply end and is used to control the connection or disconnection between the main gas supply end and the gas-consuming equipment. Specifically, the first switching valve 13 is a pneumatic valve, an electric valve, a hydraulic valve, a manual valve, or a valve with other automatic functions. This structural arrangement allows for convenient control via the first switching valve 13 when it is necessary to connect or disconnect the main gas supply module 10 and the gas-consuming equipment.

[0104] like Figure 4 and Figure 5 As shown in Embodiments 3 and 4 of the present invention, the main gas supply module 10 includes a first buffer 12, which is disposed between the gas inlet and the main gas supply end; the first buffer 12 has a first buffer chamber for accommodating fuel gas. Specifically, the first buffer 12 is one of a container, tank, pipeline, or structure that has a buffering function. With this structural arrangement, when switching from the main gas supply module 10 to the standby module 20, the main gas supply module 10 enters the wellhead gas recovery stage. The first buffer 12 enables the wellhead gas to recover more quickly, which is beneficial to achieving the goal of using wellhead gas for gas supply as much as possible.

[0105] like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown in Embodiments 5, 6, 7, and 8 of the present invention, the backup module 20 includes a second switching valve 23. The second switching valve 23 is located at the backup air supply port and is used to connect or disconnect the backup air supply port from the air-consuming equipment. Specifically, the second switching valve 23 is a pneumatic valve, an electric valve, a hydraulic valve, a manual valve, or a valve with other automatic functions. This structural arrangement allows for convenient control via the second switching valve 23 when it is necessary to connect or disconnect the backup air supply port from the air-consuming equipment.

[0106] like Figure 6 As shown, in Embodiment 1 of the present invention, the backup module 20 includes a third pressure detection element 24. The third pressure detection element 24 is used to detect the pressure value of the fuel gas flowing out of the backup module 20, so as to connect or disconnect the backup gas supply port from the gas-consuming equipment according to the detection result of the third pressure detection element 24. With this structural arrangement, the connection or disconnection between the backup gas supply port and the gas-consuming equipment can be controlled by detecting the pressure value of the fuel gas flowing out of the backup module 20 through the third pressure detection element 24. Specifically, the third pressure detection element 24 is disposed at the backup gas supply port.

[0107] Specifically, the third pressure sensing element 24 includes a fourth root valve 241. The fourth root valve 241 allows the third pressure sensing element 24 to be removed for calibration or maintenance without requiring gas venting in the pipeline of the spare module 20.

[0108] like Figure 6 As shown, in Embodiment 1 of the present invention, the backup module 20 includes a second one-way valve 25, which is disposed at the backup gas supply port. This structural arrangement ensures that gas can only flow from the backup module 20 to the gas-consuming equipment and cannot flow back, thereby effectively guaranteeing the normal operation of the backup module 20.

[0109] like Figure 6 and Figure 7 As shown, in Embodiment 1 of the present invention, the backup module 20 includes a second buffer 26 and a processing unit 22. The second buffer 26 has a second buffer chamber for containing fuel gas. The processing unit 22 forms at least a portion of the backup module 20, and the second buffer 26 is disposed between the processing unit 22 and the backup gas supply port. With this structural arrangement, the fuel gas pretreated by the processing unit 22 can be stored in the second buffer chamber to facilitate gas supply to gas-using equipment.

[0110] Specifically, the second buffer component 26 is one of the components with a certain volume, such as a buffer tank, container, pipe, pipe section, or pipe fitting.

[0111] like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown in Embodiments 5, 6, 7, and 8 of the present invention, the backup module 20 further includes a fourth pressure detection element 27, which is connected to the second buffer element 26 to detect the pressure of the fuel gas within the second buffer element 26. This allows for determination of whether the pressure of the fuel gas within the second buffer element 26 is too low or too high based on the detection result of the fourth pressure detection element 27, facilitating corresponding processing to ensure that the pressure value of the fuel gas within the second buffer element 26 is within a suitable range.

[0112] like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, in Embodiments 5, 6, 7 and 8 of the present invention, in order to prevent overpressure in the second buffer 26, the backup module 20 further includes a relief valve 28, which is connected to the second buffer 26.

[0113] like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, in embodiments five, six, seven, and eight of the present invention, the backup module 20 further includes a first root valve 29, which is disposed between the fourth pressure detection element 27 and the second buffer element 26. Thus, when the fourth pressure detection element 27 needs to be removed for calibration or maintenance, it is not necessary to vent the gas in the second buffer element 26.

[0114] like Figure 6 As shown, in Embodiment 1 of the present invention, the backup module 20 further includes a third one-way valve 210, which is disposed between the second buffer 26 and the processing unit 22. With this structural arrangement, the third one-way valve 210 ensures that gas can only flow from the processing unit 22 to the second buffer 26 and cannot flow back, thereby effectively guaranteeing the normal operation of the processing unit 22.

[0115] like Figure 6 and Figure 7 As shown, in Embodiment 1 of the present invention, the backup module 20 includes a processing component 22, which forms at least a portion of the backup module 20. To ensure a stable pressure for the fuel gas flowing out of the backup module 20, the backup module 20 further includes a pressure regulating component 211, which is connected to the processing component 22 and is used to regulate the pressure of the fuel gas flowing out of the processing component 22.

[0116] Specifically, the pressure regulating component 211 is one of the following: pressure regulating valve, pressure regulating valve assembly, or component with pressure regulating function.

[0117] like Figure 9 and Figure 10 As shown, in Embodiments 6 and 7 of the present invention, in order to avoid overpressure in the processing unit 22, the backup module 20 further includes a venting valve 212, which is connected to the processing unit 22.

[0118] like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, in embodiments five, six, seven, and eight of the present invention, the backup module 20 further includes a backup vent valve 213, which is connected to the second buffer 26. The backup module 20 also includes a fifth root valve 281, which is disposed between the second buffer 26 and the vent valve 281, so that when the vent valve 28 needs to be removed for calibration or maintenance, it is not necessary to vent the gas inside the second buffer 26. The backup module 20 also includes an interface 214, which is connected to the second buffer 26 to facilitate connection of the second buffer 26 to other devices.

[0119] Specifically, when LNG or LPG or similar gasified fuels or CNG or similar compressed fuels (such as H2, biomass gas or other gaseous fuels) are used as the fuel to be processed in the backup module 20, if the processing unit 22 has a buffer function component and a pressure regulating function component, the second buffer component 26 can be replaced by the buffer function component in the processing unit 22, and the pressure regulating component 211 can be replaced by the pressure regulating function component in the processing unit 22.

[0120] like Figure 12 and Figure 13 As shown, Embodiment 9 of the present invention provides a gas supply method. The gas supply method is applicable to the gas supply system provided in all the above embodiments. The gas supply method includes a main gas supply process, which includes: obtaining the pressure value of the fuel gas at the gas-consuming equipment; and setting the standby module 20 of the gas supply system to a warning state or a gas supply state according to the pressure value of the fuel gas at the gas-consuming equipment.

[0121] The gas supply method provided in Embodiment 9 of this invention can detect the pressure value at the gas-consuming device through the first pressure detection element 30. When the pressure value at the gas-consuming device drops to a certain preset value, the backup module 20 of the gas supply system is put into an early warning state. At least a portion of the backup module 20 is activated to pre-process the fuel to be processed in the backup module 20 to obtain usable fuel that can be directly used by the gas-consuming device. At the same time, the backup gas supply port is disconnected from the gas-consuming device so that the pre-processing operation in the backup module 20 will not affect the normal gas supply from the main gas supply module 10 to the gas-consuming device. When the pressure value at the gas-consuming device drops to a preset limit value, the backup module 20 of the gas supply system is put into a gas supply state, and the backup gas supply port is connected to the gas-consuming device to introduce the pre-processed usable fuel into the gas-consuming device. With this configuration, when the main gas supply module 10 encounters a gas supply problem to the gas-consuming equipment, the backup module 20, which already contains pre-treated fuel, allows the gas supply system to directly connect the backup module 20 and the gas-consuming equipment. The available fuel in the backup module 20 then supplies gas to the equipment, enabling a rapid switchover between the main gas supply module 10 and the backup module 20 without waiting for the backup module 20 to pre-treat the fuel after the switch. Therefore, the gas supply method provided in this embodiment solves the technical problem in the prior art where backup fuel cannot quickly switch into the gas supply.

[0122] Specifically, before obtaining the pressure value of the fuel gas at the gas-consuming equipment, the main gas supply process also includes: detecting the pressure value within the backup module 20; when the pressure value within the backup module 20 is less than a preset lower limit for gas consumption, pre-treating at least a portion of the fuel to be processed in the backup module 20 to increase the pressure value within the backup module 20; when the pressure value within the backup module 20 is greater than or equal to a preset upper limit for buffering, depressurizing the backup module 20 to reduce the pressure value within the backup module 20; and when the pressure value within the backup module 20 is greater than or equal to the preset lower limit for gas consumption and less than the preset upper limit for buffering, connecting the main gas supply module 10 of the gas supply system to the gas-consuming equipment. This configuration ensures that before supplying gas to the gas-consuming equipment using the backup module 20, the pressure value within the backup module 20 is greater than or equal to the preset lower limit for gas consumption and less than the preset upper limit for buffering, thus preventing the pressure value within the backup module 20 from being too high and unsafe, and also preventing the pressure value within the backup module 20 from being too low and insufficient for the gas-consuming equipment.

[0123] Specifically, when the pressure value inside the backup module 20 is less than the preset lower limit of gas consumption, if at least a portion of the backup module 20 is pre-treating the fuel to be treated, the working power of at least a portion of the backup module 20 is increased to increase the pressure value inside the backup module 20.

[0124] Specifically, the method for setting the standby module 20 of the gas supply system to either a warning state or a gas supply state based on the pressure value of the fuel gas at the gas-consuming equipment includes: acquiring a preset warning value and a preset switching value; comparing the pressure value of the fuel gas at the gas-consuming equipment with the preset warning value; when the pressure value of the fuel gas at the gas-consuming equipment is greater than or equal to the preset warning value, causing at least a portion of the standby module 20 to stop pre-processing the fuel to be processed; when the pressure value of the fuel gas at the gas-consuming equipment is less than the preset warning value, setting the standby module 20 to a warning state and causing the standby module 20 to enter a standby gas supply process; wherein the standby gas supply process includes: comparing the pressure value of the fuel gas at the gas-consuming equipment with the preset switching value; when the pressure value of the fuel gas at the gas-consuming equipment is greater than or equal to the preset switching value, disconnecting the standby module 20 from the gas-consuming equipment; when the pressure value of the fuel gas at the gas-consuming equipment is less than the preset switching value, setting the standby module 20 to a gas supply state; the preset warning value is greater than the preset switching value. With this setup, when the pressure at the gas-consuming device drops to a preset warning value, at least a portion of the backup module 20 can be activated to pre-process the fuel awaiting processing in the backup module 20 to obtain usable fuel that the gas-consuming device can directly use. Simultaneously, the backup gas supply port is disconnected from the gas-consuming device, ensuring that the pre-processing operation in the backup module 20 does not affect the normal gas supply from the main gas supply module 10 to the gas-consuming device. When the pressure at the gas-consuming device drops to a preset switching value, the backup gas supply port is reconnected to the gas-consuming device to introduce the pre-processed usable fuel. This allows for rapid switching of gas supply between the main gas supply module 10 and the backup module 20 without waiting for the backup module 20 to pre-process the fuel after switching.

[0125] In this embodiment, in order to improve the recovery effect of fuel gas in the main gas supply module 10, after the backup module 20 is put into gas supply state when the pressure value of fuel gas at the gas-consuming device is less than the preset switching value, the backup gas supply process also includes disconnecting the main gas supply module 10 of the gas supply system from the gas-consuming device.

[0126] Specifically, after the backup module 20 is put into gas supply mode when the pressure of the fuel gas at the gas-consuming equipment is lower than the preset switching value, the backup gas supply process also includes ensuring that the gas supply pressure of the backup module 20 is greater than the gas supply pressure of the main gas supply module 10. This allows the fuel gas in the main gas supply module 10 to be better buffered, so that the gas supply is more stable and longer when switching back to the main gas supply module 10.

[0127] Specifically, the gas supply method also includes obtaining the lower limit value PCL of the gas supply pressure of the standby module 20 and the preset value PC of the gas supply pressure of the standby module 20, such that PCL ≤ PC < PA, where PA is the preset value of the gas supply pressure when the main gas supply module 10 supplies gas to the gas-consuming equipment normally. In this way, by setting the preset value PC of the gas supply pressure, the gas supply pressure of the standby module 20 can be kept within a suitable range, so that the standby module 20 can supply gas better.

[0128] Preferably, the lower limit of the gas supply pressure PCL is equal to the preset switching value.

[0129] Specifically, the method for obtaining the preset warning value and preset switching value includes: obtaining the lower limit value of gas consumption PAL of the gas-consuming equipment and the lower limit value of gas supply PBL of the main gas supply module 10 of the gas supply system; obtaining the preset switching value PLL, PLL = max|K1·PAL, K3·PBL|, K1≥0, K3≥0; obtaining the preset warning value PL, PL = max|K2·PLL, PLL+PT|, K2≥0, PT is the gas pressure value of the fuel gas in the gas-consuming equipment that decreases within the time range from the warning state to the gas supply state when the backup module 20 supplies gas to the gas-consuming equipment alone. This setting ensures that when switching to gas supply from the backup module 20, the gas pressure value at the gas-consuming equipment is greater than the preset switching value, thus avoiding the situation where the pre-processing of the fuel to be processed in the backup module 20 is not yet completed when switching is required, which would affect the gas supply from the backup module 20 to the gas-consuming equipment.

[0130] Specifically, 1 < K1 < 2. Specifically, 0 < K3 ≤ 1. Specifically, K2 > 1. In addition, it should be noted that K1·PAL represents the product of K1 and PAL; K3·PBL represents the product of K3 and PBL; K2·PLL represents the product of K2 and PLL.

[0131] In this embodiment, the backup gas supply process further includes: detecting the pressure value of the fuel gas in the main gas supply module 10 of the gas supply system; when the pressure value of the fuel gas in the main gas supply module 10 is less than a preset switching value, disconnecting the main gas supply module 10 from the gas-consuming equipment; when the pressure value of the fuel gas in the main gas supply module 10 is greater than or equal to the preset switching value, connecting the main gas supply module 10 to the gas-consuming equipment and disconnecting the backup module 20 from the gas-consuming equipment. With this setting, when the fuel gas in the main gas supply module 10 is sufficient, the system can switch to supplying gas to the gas-consuming equipment from the main gas supply module 10, so that the gas supply system can make better use of the wellhead gas in the main gas supply module 10.

[0132] Specifically, after disconnecting the main gas supply module 10 from the gas-consuming equipment, the gas supply method further includes: obtaining the pressure value within the backup module 20 and obtaining a preset buffer upper limit value; when the pressure value within the backup module 20 is less than the preset buffer upper limit value, at least a portion of the backup module 20 pre-processes the fuel to be processed in the backup module 20 and enters the backup gas supply process; when the pressure value within the backup module 20 is greater than or equal to the preset buffer upper limit value, at least a portion of the backup module 20 stops pre-processing the fuel to be processed and enters the main gas supply process. In this way, during the process of the backup module 20 supplying gas to the gas-consuming equipment, it is possible to further determine whether at least a portion of the backup module 20 still needs to pre-process the fuel to be processed. If the pressure value within the backup module 20 is too high, at least a portion of the backup module 20 can stop pre-processing the fuel to be processed and return to the main gas supply process for subsequent processing. If the pressure value within the backup module 20 is less than the preset buffer upper limit value, at least a portion of the backup module 20 can continue pre-processing the fuel to be processed and return to the backup gas supply process for subsequent processing.

[0133] Specifically, the method for obtaining the preset buffer upper limit value includes: obtaining the pressure safety value PH inside the backup module 20; obtaining the preset buffer upper limit value PHH, such that PHH < PH. In this way, it can be ensured that the pressure value inside the backup module 20 is always less than the pressure safety value PH, making the gas supply process safer and more reliable.

[0134] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0135] (1) Based on the characteristics of the gasification equipment and wellhead gas parameters, set corresponding storage pressure and volume values ​​to ensure the availability of fuel when wellhead gas fluctuates, given the unpredictable timing of these fluctuations. By setting appropriate detection PL values, early warnings are provided to initiate startup preparation. By configuring appropriate pneumatic valves, check valves, and sensors, the standby LNG gasification is automatically activated when the PLL value is reached. This addresses the issue of conventional equipment requiring approximately 5-15 minutes from start-up to operation, which fails to meet the requirement for rapid backup fuel integration during operation.

[0136] (2) By setting up a buffer pressure regulating device, the system and method of this invention can quickly and timely switch the standby module and simultaneously put the LNG / LPG gasification equipment or CNG pressure reducing equipment into operation, thus solving the problem that the start-up time of the LNG / LPG gasification skid or CNG does not meet the switching time requirements of the gas turbine and other downstream equipment. At the same time, in terms of start-up time, it also solves the problem that the existing technology cannot avoid the premature hot standby of the LNG / LPG gasification equipment or CNG pressure reducing equipment, resulting in a large amount of LNG / LPG gasification venting or CNG venting and excessive energy consumption.

[0137] (3) By setting the outlet pressure settings of the automatic valve, check valve, buffer pressure regulator, and gas treatment components, as well as the valve position status under different conditions, the overall system can achieve rapid automatic switching. This solves the problem that existing gasification equipment and gas treatment equipment mostly rely on monitoring simple operating parameters, making it difficult to automatically switch according to the required switching time.

[0138] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0139] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0140] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0141] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0142] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0143] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas supply system, characterized in that, include: The main gas supply module (10) is used to introduce fuel gas at its inlet end, and the main gas supply end of the main gas supply module (10) is used to connect with the gas-using equipment. A backup module (20) has a backup gas supply port that can be selectively connected to or disconnected from the gas-using equipment; the backup module (20) has an early warning state and a gas supply state; when the backup module (20) is in the early warning state, at least a portion of the backup module (20) is used to pre-treat the fuel to be processed in the backup module (20) to obtain usable fuel, and the backup gas supply port is disconnected from the gas-using equipment; When the backup module (20) is in the gas supply state, the available fuel is supplied to the gas-using equipment, and the backup gas supply port is connected to the gas-using equipment; The first pressure detection element (30) is used to detect the pressure value at the gas-using equipment, so as to put the backup module (20) into the warning state or into the gas supply state according to the detection result of the first pressure detection element (30).

2. The gas supply system according to claim 1, characterized in that, The gas supply system further includes a second pressure detection element (11), which is used to detect the pressure value of the fuel gas in the main gas supply module (10), so as to connect or disconnect the main gas supply terminal from the gas-using equipment according to the detection result of the second pressure detection element (11); and / or, The backup module (20) includes a fuel storage unit (21) and a processing unit (22), wherein the fuel storage unit (21) and the processing unit (22) are connected in communication, the fuel storage unit (21) is used to store the fuel to be processed, and the processing unit (22) forms at least a part of the backup module (20).

3. The gas supply system according to claim 1, characterized in that, The main gas supply module (10) includes: A first buffer (12) is disposed between the air inlet and the main air supply end; the first buffer (12) has a first buffer chamber for accommodating fuel gas; and / or, A first switching valve (13) is disposed at the main gas supply end, and the first switching valve (13) is used to control the connection or disconnection between the main gas supply end and the gas-consuming equipment; and / or, A first check valve (14) is provided at the main gas supply end; and / or, A gas treatment unit (15) is disposed between the gas inlet and the main gas supply end, and the gas treatment unit (15) is used to treat fuel gas.

4. The gas supply system according to claim 1, characterized in that, The backup module (20) includes: A second switching valve (23) is provided at the backup gas supply port. The second switching valve (23) is used to connect or disconnect the backup gas supply port from the gas-using equipment; and / or, A third pressure detection element (24) is used to detect the pressure value of the fuel gas flowing out of the backup module (20), so as to connect or disconnect the backup gas supply port from the gas-using equipment according to the detection result of the third pressure detection element (24); and / or, The second check valve (25) is located at the backup gas supply port.

5. The gas supply system according to claim 1, characterized in that, The backup module (20) includes: The second buffer (26) has a second buffer chamber for containing fuel gas. Processing component (22), which forms at least a portion of the backup module (20), and the second buffer (26) is disposed between the processing component (22) and the backup air supply port; A fourth pressure detection element (27) is connected to the second buffer (26) to detect the pressure of fuel gas in the second buffer (26).

6. The gas supply system according to claim 5, characterized in that, The backup module (20) also includes: A relief valve (28) is connected to the second buffer (26); and / or, A first root valve (29) is disposed between the fourth pressure sensing element (27) and the second buffer element (26); and / or, A third one-way valve (210) is disposed between the second buffer (26) and the processing unit (22).

7. The gas supply system according to claim 1, characterized in that, The backup module (20) includes a processing component (22) that forms at least a portion of the backup module (20); the backup module (20) further includes: A pressure regulating component (211), connected to the processing component (22), the pressure regulating component (211) being used to regulate the pressure of fuel gas flowing out of the processing component (22); and / or, A vent valve (212) is connected to the processing unit (22).

8. A gas supply method, characterized in that, The gas supply method is applicable to the gas supply system according to any one of claims 1 to 7, and the gas supply method includes a main gas supply process, which includes: Obtain the pressure value of the fuel gas at the gas-using equipment; The backup module of the gas supply system is set to either an early warning state or a gas supply state based on the pressure value of the fuel gas at the gas-using equipment.

9. The gas supply method according to claim 8, characterized in that, Before obtaining the pressure value of the fuel gas at the gas-consuming equipment, the main gas supply process further includes: Detect the pressure value within the backup module; When the pressure value in the backup module is less than the preset lower limit of gas consumption, at least a portion of the fuel to be processed in the backup module is pre-treated to increase the pressure value in the backup module. When the pressure value inside the backup module is greater than or equal to the preset buffer upper limit value, the backup module is depressurized to reduce the pressure value inside the backup module. When the pressure value in the backup module is greater than or equal to the preset lower limit of gas consumption and less than the preset upper limit of buffer, the main gas supply module of the gas supply system is connected to the gas-consuming device.

10. The gas supply method according to claim 8, characterized in that, The step of setting the standby module of the gas supply system to either a warning state or a gas supply state based on the pressure value of the fuel gas at the gas-consuming equipment includes: Obtain preset warning values ​​and preset switching values; Compare the pressure value of the fuel gas at the gas-using equipment with the preset warning value; When the pressure of the fuel gas at the gas-using equipment is greater than or equal to the preset warning value, at least part of the backup module stops pre-treating the fuel to be processed. When the pressure of the fuel gas at the gas-consuming equipment is less than the preset warning value, the backup module is put into the warning state, and the backup module enters the backup gas supply process. The backup gas supply process includes: comparing the pressure value of the fuel gas at the gas-consuming device with the preset switching value; disconnecting the backup module from the gas-consuming device when the pressure value of the fuel gas at the gas-consuming device is greater than or equal to the preset switching value; and putting the backup module into the gas supply state when the pressure value of the fuel gas at the gas-consuming device is less than the preset switching value. The preset warning value is greater than the preset switching value.

11. The gas supply method according to claim 10, characterized in that, After the backup module is put into the gas supply state when the pressure of the fuel gas at the gas-consuming device is less than the preset switching value, the backup gas supply process further includes: Disconnect the main gas supply module of the gas supply system from the gas-consuming equipment; and / or, The air pressure supplied by the backup module is made greater than that supplied by the main air supply module.

12. The gas supply method according to claim 10, characterized in that, The gas supply method further includes obtaining the lower limit value of the gas supply pressure PCL of the backup module and the preset value of the gas supply pressure PC of the backup module, such that PCL≤PC<PA, where PA is the preset value of the gas supply pressure when the main gas supply module supplies gas to the gas-consuming equipment normally. And / or, The acquisition of preset warning values ​​and preset switching values ​​includes: Obtain the lower limit value of gas consumption PAL of the gas-consuming equipment and the lower limit value of gas supply PBL of the main gas supply module of the gas supply system; Obtain the preset switching value PLL, PLL = max|K1·PAL, K3·PBL|, K1≥0, K3≥0; Obtain the preset warning value PL, PL=max|K2·PLL,PLL+PT|,K2≥0,PT is the gas pressure value of the fuel gas in the gas-consuming equipment that decreases within the time range from the warning state to the gas supply state when the backup module supplies gas to the gas-consuming equipment alone.

13. The gas supply method according to claim 10, characterized in that, The backup gas supply process also includes: Detect the pressure value of the fuel gas in the main gas supply module of the gas supply system; When the pressure of the fuel gas in the main gas supply module is less than the preset switching value, the main gas supply module is disconnected from the gas-consuming equipment. When the pressure of the fuel gas in the main gas supply module is greater than or equal to the preset switching value, the main gas supply module is connected to the gas-consuming device, and the backup module is disconnected from the gas-consuming device.

14. The gas supply method according to claim 13, characterized in that, After disconnecting the main gas supply module from the gas-consuming device, the gas supply method further includes: Obtain the pressure value within the backup module and obtain the preset buffer upper limit value; When the pressure value in the backup module is less than the preset buffer upper limit value, at least a portion of the backup module pre-processes the fuel to be processed in the backup module and enters the backup gas supply process. When the pressure value in the backup module is greater than or equal to the preset buffer upper limit value, at least a portion of the backup module stops pre-processing the fuel to be processed and enters the main gas supply process.

15. The gas supply method according to claim 14, characterized in that, The step of obtaining the preset buffer upper limit value includes: Obtain the pressure safety value PH within the backup module; Obtain the preset buffer upper limit value PHH, such that PHH < PH.

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