A hydrogen-blended fuel gas riser structure and control method thereof

Abstract

The present invention relates to a hydrogen-blended fuel gas riser structure and a control method thereof, comprising a gas transmission pipeline, a circulation component and a plurality of user ends; the gas transmission pipeline comprises a gas supply pipe, a riser and a return pipe, a check valve is installed on the gas supply pipe, one end of the gas supply pipe is externally connected to a mixed gas source of hydrogen and natural gas, one end of the gas supply pipe is communicated with the bottom end of the riser, the top end of the riser is communicated with one end of the return pipe, a connection port is provided between the connection between the gas supply pipe and the riser and the check valve, and the other end of the return pipe is communicated with the connection port; the circulation component is provided on the return pipe, and is used to drive the airflow in the riser and the return pipe to circulate; a plurality of user ends are arranged in sequence along the length direction of the riser and are all communicated with the riser; the problem that the mixed gas of hydrogen and natural gas in the gas transmission riser is easy to be stratified due to the different densities of hydrogen and natural gas is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas pipelines, and in particular to a hydrogen-blended gas riser structure and a control method thereof. Background Art

[0002] Hydrogen-blended natural gas is mainly used as commercial or civilian gas fuel, which can solve the problem of large-scale transportation of hydrogen. Currently, most of the existing end-user fuel appliances are designed for natural gas and liquefied petroleum gas. Direct supply of hydrogen as fuel requires the replacement of gas appliances and the laying of hydrogen transmission pipelines, resulting in high cost of use. Blending hydrogen into the existing natural gas pipeline network can carry a considerable amount of energy, and hydrogen blending in the natural gas pipeline network can further reduce the carbon emissions of natural gas.

[0003] For example, CN202011477933.1, a hydrogen-blended natural gas transportation and separation system and its control method, fills the gap in domestic natural gas pipeline hydrogen blending specifications and standards by adding hydrogen to natural gas.

[0004] However, natural gas usage has peak usage phases and off-peak usage phases. When natural gas is in the off-peak usage phase, due to the different densities of hydrogen and natural gas, the mixed gas of hydrogen and natural gas in the riser that transports gas is easily stratified. The part of the riser located on high floors is filled with hydrogen, and the part of the riser located on middle and low floors is filled with natural gas. If used directly, it is easy to cause safety accidents. Summary of the invention

[0005] In view of this, it is necessary to provide a hydrogen-blended fuel gas riser structure and a control method thereof to solve the problem that the mixed gas of hydrogen and natural gas in the riser for transporting gas is easy to be stratified due to the different densities of hydrogen and natural gas.

[0006] The present invention provides a hydrogen-blended fuel gas riser structure, comprising a gas transmission pipeline, a circulation component and a plurality of user ends; the gas transmission pipeline comprises an air supply pipe, a riser and a return pipe, a check valve is installed on the air supply pipe, one end of the air supply pipe is externally connected to a mixed gas source of hydrogen and natural gas, one end of the air supply pipe is connected to the bottom end of the riser, the top of the riser is connected to one end of the return pipe, a connecting port exists between the connection between the air supply pipe and the riser and the check valve, and the other end of the return pipe is connected to the connecting port; the circulation component is arranged on the return pipe, and is used to drive the airflow in the riser and the return pipe to circulate; the plurality of user ends are arranged in sequence along the length direction of the riser, and are all connected to the riser.

[0007] Furthermore, the length direction of the riser is arranged along the height of the building.

[0008] Furthermore, the return pipe is a vertical pipe, and the top of the return pipe is connected to the top of the vertical pipe via a U-shaped elbow.

[0009] Further, when the mixed gas source enters the riser, the check valve is opened, and when the mixed gas source does not enter the riser, the check valve is closed.

[0010] Furthermore, the circulation component is a fan, which is built in the return pipe and is used to suck the gas in the riser into the return pipe and blow it back into the riser.

[0011] The present invention also provides a method for controlling a hydrogen-doped fuel gas riser structure, comprising the following steps:

[0012] S1. When stratification occurs between hydrogen and natural gas in the riser, the circulation component works intermittently;

[0013] S2, so that the gas between the riser and the return pipe circulates and the hydrogen and natural gas are fully mixed.

[0014] Furthermore, the usage time of the user end includes a peak usage period and a low peak usage period. The low peak usage period is when the hydrogen and natural gas in the riser are stratified. The peak usage period is morning, noon and evening, and the low peak usage period is the rest of the day except the peak usage period.

[0015] Furthermore, the circulation component has a working state and a non-working state. When the circulation component is in the working state, the gas between the riser and the return pipe circulates. When the circulation component is in the non-working state, the gas in the riser stagnates and the hydrogen and natural gas tend to a stratified state. The time that the circulation component is in the non-working state is less than the time required for the hydrogen and natural gas to be completely stratified.

[0016] Furthermore, the structure also includes a control component, which is used to drive the circulation component to switch back and forth between the working state and the non-working state;

[0017] The control component includes an airflow sensor and an information processor, the airflow sensor is electrically connected to the information processor, the information processor is electrically connected to the circulation component, the detection end of the airflow sensor is built into the air supply pipe, the airflow sensor is located on the side of the check valve away from the connecting port, the airflow sensor is used to detect whether a mixed gas source of hydrogen and natural gas enters one end of the air supply pipe, when the mixed gas source enters, the information processor controls the circulation component to be in the non-working state, when the mixed gas source does not enter, the information processor controls the circulation component to switch back and forth between the working state and the non-working state.

[0018] Furthermore, a pressure differential power generation type voltage regulator is installed in the air supply pipe, and the pressure differential power generation type voltage regulator is arranged between the airflow sensor and the check valve. The control component also includes a battery, and the battery is electrically connected to the pressure differential power generation type voltage regulator, and the battery is electrically connected to the information processor, so that the electric energy generated by the pressure differential power generation type voltage regulator is stored in the battery and supplied to the information processor.

[0019] Compared with the prior art, the invention provides a gas transmission pipeline including a gas supply pipe, a riser and a return pipe, a check valve is installed on the gas supply pipe, one end of the gas supply pipe is externally connected to a mixed gas source of hydrogen and natural gas, one end of the gas supply pipe is connected to the bottom end of the riser, the top end of the riser is connected to one end of the return pipe, a connection port is provided between the connection between the gas supply pipe and the riser and the check valve, the other end of the return pipe is connected to the connection port, a circulation component is provided on the return pipe, and is used to drive the airflow in the riser and the return pipe to circulate, which can effectively prevent the hydrogen and natural gas from being stratified in the riser, and avoid the occurrence of safety accidents;

[0020] At the same time, through the hydrogen-blended fuel gas riser structure control method, when stratification occurs between the hydrogen and natural gas in the riser, the circulation component can work intermittently to allow the gas between the riser and the reflux pipe to circulate, and the hydrogen and natural gas to be fully mixed, which can effectively prevent the natural gas and hydrogen from stratifying in the riser and avoid safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a hydrogen-blended fuel gas riser structure in this embodiment provided by the present invention;

[0022] Figure 2 A schematic diagram of a hydrogen-blended fuel gas riser structure control method provided by the present invention. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0024] like Figure 1 As shown, a hydrogen-blended gas riser structure in this embodiment includes a gas transmission pipeline 100, a circulation component 200 and multiple user terminals 400, wherein the gas transmission pipeline 100 is used to transport a mixed gas source of hydrogen and natural gas to multiple user terminals 400, and the circulation component 200 can prevent the hydrogen and natural gas in the transmission pipeline from stratification, which is explained and described in more detail below.

[0025] The gas transmission pipeline 100 in this embodiment includes an air supply pipe 110, a riser 120 and a return pipe 130. A check valve 112 is installed on the air supply pipe 110. One end of the air supply pipe 110 is connected to a mixed gas source of hydrogen and natural gas. One end of the air supply pipe 110 is connected to the bottom end of the riser 120. The top of the riser 120 is connected to one end of the return pipe 130. There is a connecting port between the connection between the air supply pipe 110 and the riser 120 and the check valve 112, and the other end of the return pipe 130 is connected to the connecting port.

[0026] Among them, the air supply pipe 110 is used to transport a mixed gas source of hydrogen and natural gas to the riser 120. The check valve 112 is provided to make the air flow in the air supply pipe 110 unidirectional. The riser 120 is a structure for transporting the above-mentioned mixed gas source to multiple user ends 400. By providing a return pipe 130, a return channel is formed between the riser 120 to allow the gas to circulate between the return pipe 130 and the riser 120.

[0027] The circulation component 200 in this embodiment is disposed on the return pipe 130 , and is used to drive the airflow in the riser 120 and the return pipe 130 to circulate.

[0028] The circulation assembly 200 is provided to realize the circulation of gas between the return pipe 130 and the riser 120 .

[0029] In this embodiment, the plurality of user terminals 400 are sequentially arranged along the length direction of the riser 120 and are all connected to the riser 120 .

[0030] It is understandable that the user end 400 is a structure that can be imagined by those skilled in the art, such as a gas stove or a gas stove in a building that needs to use a mixed gas of hydrogen and natural gas, and no further elaboration and explanation will be given here.

[0031] In this embodiment, the length direction of the riser 120 is arranged along the height of the building.

[0032] In this embodiment, the return pipe 130 is a vertical pipe, and the top of the return pipe 130 is connected to the top of the vertical pipe 120 via a U-shaped elbow.

[0033] In this embodiment, when a mixed gas source enters the riser 120 , the check valve 112 is opened, and when no mixed gas source enters the riser 120 , the check valve 112 is closed.

[0034] The circulation component 200 in this embodiment is a fan, which is built into the return pipe 130 and is used to suck the gas in the riser 120 into the return pipe 130 and blow it back into the riser 120 .

[0035] It is understandable that the air supply direction of the fan is not restricted. For example, air can be sucked in from the top of the riser 120, and the airflow passes through the return pipe 130 and is blown back in from the bottom of the riser 120; air can also be sucked in from the bottom of the riser 120, and the airflow passes through the return pipe 130 and is blown back in from the top of the riser 120.

[0036] Working process: When the gas supply in the riser 120 is stopped, the hydrogen and natural gas in the riser 120 are prone to stratification. The ventilation is turned on to allow the gas in the riser 120 to circulate between the riser 120 and the return pipe 130, so that the hydrogen and natural gas are effectively mixed together, which can avoid the stratification of hydrogen and natural gas.

[0037] Compared with the prior art: a gas transmission pipeline 100 is provided including an air supply pipe 110, a riser 120 and a return pipe 130, a check valve 112 is installed on the air supply pipe 110, one end of the air supply pipe 110 is externally connected to a mixed gas source of hydrogen and natural gas, one end of the air supply pipe 110 is connected to the bottom end of the riser 120, the top of the riser 120 is connected to one end of the return pipe 130, there is a connecting port between the connection between the air supply pipe 110 and the riser 120 and the check valve 112, the other end of the return pipe 130 is connected to the connecting port, a circulation component 200 is arranged on the return pipe 130, and is used to drive the airflow in the riser 120 and the return pipe 130 to circulate, which can effectively prevent the hydrogen and natural gas from being stratified in the riser 120, and avoid the occurrence of safety accidents.

[0038] like Figure 2 As shown, a method for controlling the structure of a hydrogen-blended fuel gas riser 120 in this embodiment includes the following steps:

[0039] S1. When stratification occurs between hydrogen and natural gas in the riser 120, the circulation assembly 200 operates intermittently;

[0040] S2, so that the gas between the riser 120 and the return pipe 130 circulates and the hydrogen and natural gas are fully mixed.

[0041] By intermittently controlling the circulation component 200 to work, the hydrogen and natural gas in the riser 120 cannot be stratified, so that the gas used by the user end 400 is a mixed gas of hydrogen and natural gas.

[0042] Among them, the usage time of the user end 400 includes a peak usage period and a low peak usage period. The low peak usage period is when the hydrogen and natural gas in the riser 120 are stratified. The peak usage period is morning, noon and evening, and the low peak usage period is the rest of the day except the peak usage period.

[0043] It should be noted that the peak usage period is not necessarily in the morning, noon and evening. The above-mentioned peak usage period and off-peak usage period refer to the usage frequency of multiple user terminals 400 within a certain period of time. The above-mentioned usage frequency during the peak usage period is high, and the above-mentioned usage frequency during the off-peak period is low. Since the usage frequency during the peak usage period is high, the gas supply pipe 110 needs to continuously intake air. Therefore, the natural gas and hydrogen in the riser 120 are not easy to stratify. The usage frequency during the off-peak usage period is low, the gas supply pipe 110 intakes very little air, and the natural gas and hydrogen in the riser 120 are easy to stratify.

[0044] Among them, the circulation component 200 has a working state and a non-working state. When the circulation component 200 is in the working state, the gas between the riser 120 and the return pipe 130 circulates. When the circulation component 200 is in the non-working state, the gas in the riser 120 stagnates and the hydrogen and natural gas tend to be stratified. The time that the circulation component 200 is in the non-working state is less than the time required for the hydrogen and natural gas to be completely stratified.

[0045] In order to facilitate the automatic switching of the circulation component 200 between the working state and the non-working state, the structure also includes a control component 300, which is used to drive the circulation component 200 to switch back and forth between the working state and the non-working state.

[0046] Specifically, the control component 300 includes an airflow sensor 310 and an information processor 320. The airflow sensor 310 is electrically connected to the information processor 320, and the information processor 320 is electrically connected to the circulation component 200. The detection end of the airflow sensor 310 is built into the air supply pipe 110, and the airflow sensor 310 is located on the side of the check valve 112 away from the connecting port. The airflow sensor 310 is used to detect whether there is a mixed gas source of hydrogen and natural gas entering one end of the air supply pipe 110. When a mixed gas source enters, the information processor 320 controls the circulation component 200 to be in a non-working state. When no mixed gas source enters, the information processor 320 controls the circulation component 200 to switch back and forth between the working state and the non-working state.

[0047] Preferably, a differential pressure generator type voltage regulator 111 is installed in the air supply pipe 110, and the differential pressure generator type voltage regulator 111 is arranged between the airflow sensor 310 and the check valve 112. The control component 300 also includes a battery 330, and the battery 330 is electrically connected to the differential pressure generator type voltage regulator 111, and the battery 330 is electrically connected to the information processor 320, so that the electric energy generated by the differential pressure generator type voltage regulator 111 is stored in the battery 330 and supplied to the information processor 320 for operation.

[0048] Working process: the air flow sensor 310 detects whether a mixed gas source enters the air supply pipe 110. If a mixed gas source enters, it indicates that the user end 400 is in a peak period of use. If no mixed gas source enters for a long time, it indicates that the user end 400 is in a low-peak period of use. When the user end 400 is in the peak period of use, the circulation component 200 is always in a non-working state, and the mixed gas source sequentially supplies gas to multiple user ends 400 through the air supply pipe 110 and the riser 120. When the user end 400 is in the peak period of use, the information processor 320 controls the circulation component 200 to work intermittently, that is, to switch back and forth between the working state and the non-working state, so that the natural gas and hydrogen in the riser 120 are always in a state where they cannot be stratified.

[0049] Compared with the prior art: when stratification occurs between the hydrogen and natural gas in the riser 120, the circulation component 200 works intermittently to allow the gas between the riser 120 and the return pipe 130 to circulate, and the hydrogen and natural gas are fully mixed, which can effectively prevent the natural gas and hydrogen from stratifying in the riser 120 and avoid safety accidents.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A hydrogen-blended gas riser structure, characterized in that: Including gas transmission pipelines, circulation components and multiple user ends; The gas transmission pipeline includes an air supply pipe, a standpipe and a return pipe, a check valve is installed on the air supply pipe, one end of the air supply pipe is externally connected to a mixed gas source of hydrogen and natural gas, one end of the air supply pipe is connected to the bottom end of the standpipe, the top end of the standpipe is connected to one end of the return pipe, a connection port is present between the connection between the air supply pipe and the standpipe and the check valve, and the other end of the return pipe is connected to the connection port; The circulation component is arranged on the return pipe and is used to drive the airflow in the riser and the return pipe to circulate; The plurality of user terminals are arranged in sequence along the length direction of the riser and are all connected to the riser.

2. The hydrogen-blended gas riser structure according to claim 1, characterized in that: The length direction of the riser is arranged along the height of the building.

3. The hydrogen-blended gas riser structure according to claim 1, characterized in that: The return pipe is a vertical pipe, and the top of the return pipe is connected to the top of the vertical pipe via a U-shaped elbow.

4. The hydrogen-blended gas riser structure according to claim 1, characterized in that: When the mixed gas source enters the riser, the check valve opens, and when the mixed gas source does not enter the riser, the check valve closes.

5. The hydrogen-blended gas riser structure according to claim 1, characterized in that: The circulation component is a fan, which is built into the return pipe and is used to suck the gas in the riser into the return pipe and blow it back into the riser.

6. A method for controlling a hydrogen-doped gas riser structure, applicable to the hydrogen-doped gas riser structure according to any one of claims 1 to 5, characterized in that: The following steps are involved: When stratification occurs between hydrogen and natural gas in the riser, the circulation assembly works intermittently; This allows the gas between the riser and the return pipe to circulate and the hydrogen and natural gas to be fully mixed.

7. The method for controlling the structure of a hydrogen-blended fuel gas riser according to claim 6, characterized in that: The usage time of the user end includes a peak usage period and a low peak usage period. The low peak usage period is when the hydrogen and natural gas in the riser are stratified. The peak usage period is morning, noon and evening, and the low peak usage period is the rest of the day except the peak usage period.

8. The method for controlling the structure of a hydrogen-blended fuel gas riser according to claim 6, characterized in that: The circulation component has a working state and a non-working state. When the circulation component is in the working state, the gas between the riser and the return pipe circulates. When the circulation component is in the non-working state, the gas in the riser stagnates and hydrogen and natural gas tend to a stratified state. The time that the circulation component is in the non-working state is less than the time required for hydrogen and natural gas to be completely stratified.

9. The method for controlling the structure of a hydrogen-blended gas riser according to claim 8, characterized in that: The structure also includes a control component, which is used to drive the circulation component to switch back and forth between the working state and the non-working state; The control component includes an airflow sensor and an information processor, the airflow sensor is electrically connected to the information processor, the information processor is electrically connected to the circulation component, the detection end of the airflow sensor is built into the air supply pipe, the airflow sensor is located on the side of the check valve away from the connecting port, the airflow sensor is used to detect whether a mixed gas source of hydrogen and natural gas enters one end of the air supply pipe, when the mixed gas source enters, the information processor controls the circulation component to be in the non-working state, when the mixed gas source does not enter, the information processor controls the circulation component to switch back and forth between the working state and the non-working state.

10. The method for controlling the structure of a hydrogen-blended gas riser according to claim 9, characterized in that: A pressure differential power generation type voltage regulator is installed in the air supply pipe, and the pressure differential power generation type voltage regulator is arranged between the airflow sensor and the check valve. The control component also includes a battery, and the battery is electrically connected to the pressure differential power generation type voltage regulator. The battery is electrically connected to the information processor so that the electric energy generated by the pressure differential power generation type voltage regulator is stored in the battery and supplied to the information processor.

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