A system and method for implementing hydrogen-doped natural gas jet fire experiments

Abstract

The application discloses a system for realizing hydrogen-doped natural gas jet fire experiment, which comprises a gas supply device, a mixing device, a jet combustion device, an observation device and a collection and control device. The gas supply device is used for sequentially conveying hydrogen and natural gas satisfying an experimental partial pressure to the mixing device according to a preset gas ratio and an experimental pressure containing partial pressure information. The mixing device is used for mixing hydrogen and natural gas according to the experimental pressure. The jet combustion device is used for jetting and igniting the hydrogen-doped natural gas to form a jet fire. The observation device is used for capturing the changing state of the jet fire. The collection and control device is used for analyzing the jet fire characteristics under the current experimental condition according to the changing state of the jet fire. The application can study the minimum ignition energy and the jet fire characteristics of the hydrogen-doped natural gas under different hydrogen-doping ratios, different pressures, different leakage hole appearances and impurity influences.

Description

Technical Field

[0001] This invention relates to the field of hydrogen energy safety technology, and in particular to a system and method for conducting hydrogen-blended natural gas jet fire experiments. Background Technology

[0002] Hydrogen transportation is a crucial link in the hydrogen energy industry chain, and pipelines are an economically effective way to achieve large-scale, long-distance hydrogen transport. On the one hand, the orderly advancement of long-distance hydrogen pipeline construction is an important foundation for promoting the industrialization and large-scale development of my country's hydrogen energy industry; on the other hand, hydrogen-blended natural gas pipelines are an effective way to transport hydrogen over long distances in the short to medium term. my country has abundant wind power resources, and the abandoned wind and electricity that cannot be connected to the grid can be used to produce hydrogen, which is then blended into the existing natural gas pipeline network and transported to end users, showing broad market prospects. With the widespread application of hydrogen-blended natural gas pipelines, their safety issues have also attracted widespread attention globally. However, the leakage and combustion behavior of natural gas after hydrogen blending is a key focus of safety research.

[0003] Hydrogen-blended natural gas pipelines operate at high pressures. When a leak occurs, the pressure creates a jet stream. If the gas ignites at the leak point, a jet fire occurs. Jet fires are the most common type of fire in pipeline leaks. Therefore, to ensure the safety of hydrogen-blended natural gas pipelines during operation, it is crucial to study the jet fire behavior of hydrogen-blended natural gas.

[0004] Currently, most research on hydrogen-blended natural gas jet fires relies on numerical simulations, lacking relevant experimental data, making it difficult to study the characteristics and evolution of such accidents. Summary of the Invention

[0005] The purpose of this invention is to provide an experimental system and method for studying the jet fire behavior of hydrogen-blended natural gas, which can be used to study the characteristics and evolution of jet fire accidents involving hydrogen-blended natural gas.

[0006] To address the aforementioned technical problems, this invention provides a system for conducting a hydrogen-blended natural gas jet fire experiment, comprising: a gas supply device for sequentially supplying hydrogen and natural gas, meeting experimental partial pressure requirements, to a blending device according to a preset gas ratio and an experimental pressure containing partial pressure information; the blending device for mixing the hydrogen and natural gas according to the experimental pressure; a jet combustion device for ejecting and igniting the hydrogen-blended natural gas to form a jet fire; an observation device for capturing the changing state of the jet fire; and a data acquisition and control device for analyzing the jet fire characteristics under current experimental conditions based on the changing state of the jet fire.

[0007] Preferably, the gas supply device includes: a hydrogen transmission channel having a hydrogen source, a hydrogen transmission pipeline connected to the hydrogen source and the blending device, and a first booster pump installed on the hydrogen transmission pipeline; and a natural gas transmission channel having a natural gas source, a natural gas transmission pipeline connected to the natural gas source and the blending device, and a second booster pump installed on the natural gas transmission pipeline.

[0008] Preferably, the blending device includes: a high-pressure reactor for mixing gases by magnetic stirring; and a pressure regulating valve located at the output end of the high-pressure reactor and connected to the acquisition and control device for generating hydrogen-blended natural gas that meets the experimental pressure.

[0009] Preferably, the injection combustion device includes: an injection pipeline connected to the output end of the high-pressure reactor; a nozzle connected to the output end of the injection pipeline; and an igniter disposed near the output end of the injection pipeline.

[0010] Preferably, the nozzle is a nozzle that can be replaced with different leak hole morphologies. The acquisition and control device is also used to statistically analyze the jet fire characteristics under different experimental pressures, different gas ratios and different leak hole morphologies. The jet fire characteristics include the temperature distribution characteristics, radiation characteristics and flame morphology characteristics of the jet fire.

[0011] Preferably, the ignition energy of the igniter is adjustable, and the acquisition and control device is also used to record the ignition energy information corresponding to the current experimental conditions.

[0012] Preferably, the acquisition and control device is also used to statistically analyze the jet fire characteristics under different experimental pressures, different gas ratios, and different leak hole morphologies. The jet fire characteristics include the minimum ignition energy of hydrogen-blended natural gas, as well as the temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the jet fire.

[0013] Preferably, the system further includes an impurity addition device, which is also used to add the impurity to be studied required for the current experiment to the mixing device, wherein the impurity to be studied is a single impurity or multiple synergistic impurities.

[0014] Preferably, the observation device includes an infrared thermal imager and a high-speed camera.

[0015] Preferably, the hydrogen delivery channel further includes a first check valve disposed at the front end of the first booster pump; the natural gas delivery channel further includes a second check valve disposed at the front end of the second booster pump.

[0016] Preferably, the hydrogen delivery channel further includes a first shut-off valve disposed between the hydrogen source and the first one-way valve; the natural gas delivery channel further includes a second shut-off valve disposed between the natural gas source and the second one-way valve.

[0017] On the other hand, a method for conducting a hydrogen-blended natural gas jet fire experiment is provided. This method is implemented using the system described above. The method includes: supplying hydrogen and natural gas, meeting the experimental partial pressure, sequentially to a blending device according to a preset gas ratio and an experimental pressure containing partial pressure information; mixing the hydrogen and natural gas according to the experimental pressure using the blending device; ejecting and igniting the hydrogen-blended natural gas using a jet combustion device to form a jet fire; capturing the changing state of the jet fire using an observation device; and analyzing the jet fire characteristics under the current experimental conditions based on the changing state of the jet fire using a data acquisition and control device.

[0018] Compared with the prior art, one or more embodiments of the above solutions may have the following advantages or beneficial effects:

[0019] This invention proposes a system and method for conducting jet fire experiments on hydrogen-blended natural gas. This system and method can study the minimum ignition energy and jet fire characteristics (temperature distribution, radiation characteristics, flame morphology, etc.) of hydrogen-blended natural gas under different hydrogen blending ratios, pressures, leak morphologies, and impurities. This provides experimental basis and theoretical support for the safe transportation and risk assessment of hydrogen-blended natural gas pipelines, and is of great significance for developing safe transportation processes for hydrogen-blended natural gas pipelines, assessing pipeline safety risks, and realizing large-scale safe transportation of hydrogen energy. Specifically, this invention can achieve the following jet fire experimental studies of hydrogen-blended natural gas:

[0020] 1. Capable of studying the jet fire behavior of hydrogen-blended natural gas with different hydrogen blending ratios and pressures;

[0021] 2. It can study the influence of different leakage hole morphologies on the jet fire behavior of hydrogen-doped natural gas;

[0022] 3. It can study the influence of impurities on the jet fire behavior of hydrogen-blended natural gas;

[0023] 4. It can study the minimum ignition energy of hydrogen-blended natural gas under different operating conditions (different hydrogen blending ratios, pressures, pore morphology, impurities).

[0024] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of the system used to implement a hydrogen-doped natural gas jet fire experiment according to an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the specific structure of a first example of a system for implementing a hydrogen-doped natural gas jet fire experiment, as described in this application.

[0028] Figure 3 This is a schematic diagram of the second example of a system for implementing a hydrogen-doped natural gas jet fire experiment, as described in this application.

[0029] Figure 4 This is a schematic diagram of the steps of a method for conducting a hydrogen-doped natural gas jet fire experiment according to an embodiment of this application. Detailed Implementation

[0030] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. It should be noted that, as long as there is no conflict, the various embodiments and features in the various embodiments of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0031] Furthermore, the steps illustrated in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than that shown here.

[0032] Hydrogen transportation is a crucial link in the hydrogen energy industry chain, and pipelines are an economically effective way to achieve large-scale, long-distance hydrogen transport. On the one hand, the orderly advancement of long-distance hydrogen pipeline construction is an important foundation for promoting the industrialization and large-scale development of my country's hydrogen energy industry; on the other hand, hydrogen-blended natural gas pipelines are an effective way to transport hydrogen over long distances in the short to medium term. my country has abundant wind power resources, and the abandoned wind and electricity that cannot be connected to the grid can be used to produce hydrogen, which is then blended into the existing natural gas pipeline network and transported to end users, showing broad market prospects. With the widespread application of hydrogen-blended natural gas pipelines, their safety issues have also attracted widespread attention globally. However, the leakage and combustion behavior of natural gas after hydrogen blending is a key focus of safety research.

[0033] Hydrogen-blended natural gas pipelines operate at high pressures. When a leak occurs, the pressure creates a jet stream. If the gas ignites at the leak point, a jet fire occurs. Jet fires are the most common type of fire in pipeline leaks. Therefore, to ensure the safety of hydrogen-blended natural gas pipelines during operation, it is crucial to study the jet fire behavior of hydrogen-blended natural gas.

[0034] Currently, most research on hydrogen-blended natural gas jet fires relies on numerical simulations, lacking relevant experimental data, making it difficult to study the characteristics and evolution of such accidents.

[0035] Therefore, to address one or more of the aforementioned technical problems, this application proposes a system and method for conducting jet fire experiments on hydrogen-blended natural gas. The system and method include: a gas supply device, a hydrogen-natural gas blending device, a jet combustion device, an observation device, and a data acquisition and control device. It enables the study of the jet fire characteristics and minimum ignition energy of hydrogen-blended natural gas under different hydrogen blending ratios, pressures, leak morphologies, and impurity influences. This invention can study the characteristics and evolution of jet fire accidents involving hydrogen-blended natural gas, which is of great significance for the selection of hydrogen blending ratios in natural gas pipelines and pipeline risk management.

[0036] Example 1

[0037] Figure 1 This is a schematic diagram of the overall structure of the system used to implement a hydrogen-doped natural gas injection fire experiment according to an embodiment of this application. Figure 1 As shown, the system for realizing hydrogen-doped natural gas injection fire experiment (hereinafter referred to as "experimental system") described in this embodiment of the invention includes at least: a gas supply device A, a doping device B, an injection combustion device C, an observation device D, and a data acquisition and control device E.

[0038] Gas supply device A is used to sequentially supply hydrogen and natural gas, meeting the experimental partial pressure, to blending device B according to a preset gas ratio and an experimental pressure containing partial pressure information. Blending device B is used to mix the hydrogen and natural gas supplied in the current experiment at the aforementioned experimental pressure. Injection combustion device C is used to inject hydrogen-blended natural gas in a preset pattern and ignite it to form an injection fire. Observation device D is used to capture the changing state of the injection fire. Acquisition and control device E is used to analyze the characteristics of the injection fire under the current experimental conditions based on the changing state of the injection fire.

[0039] Figure 2 This is a schematic diagram illustrating the specific structure of a first example of a system for implementing a hydrogen-doped natural gas injection fire experiment, as described in this application. Figure 2The gas supply device A described in this embodiment of the invention includes a hydrogen delivery channel and a natural gas delivery channel. The hydrogen delivery channel includes a hydrogen source 1, a hydrogen delivery pipeline (unnumbered) connected to the hydrogen source 1 and the blending device B, and a first booster pump 4 installed on the hydrogen delivery pipeline. The natural gas delivery channel includes a natural gas source 5, a natural gas delivery pipeline (unnumbered) connected to the natural gas source 5 and the blending device B, and a second booster pump 8 installed on the natural gas delivery pipeline.

[0040] In this embodiment of the invention, hydrogen source 1 is used to store hydrogen for the experiment. The shut-off valve 2 is opened to inject hydrogen into the hydrogen delivery pipeline. The first booster pump 4 pressurizes the hydrogen passing through the current pipeline position and delivers it to the high-pressure reactor 9 in the mixing device B. The hydrogen source is turned off after the pressure inside the reactor reaches the partial pressure of hydrogen.

[0041] Similarly, natural gas source 5 is used to store natural gas for the experiment. When the shut-off valve 6 is opened, natural gas is injected into the natural gas pipeline. The second booster pump 8 pressurizes the natural gas passing through the current pipeline position and delivers it to the high-pressure reactor 9 in the blending device B. After the pressure inside the reactor reaches the experimental pressure, the natural gas source is shut off.

[0042] Further, refer to Figure 2 The blending device B includes a high-pressure reactor 9 and a pressure regulating valve 11. The high-pressure reactor 9 is used to mix hydrogen and natural gas via magnetic stirring to form hydrogen-blended natural gas that meets the current hydrogen blending ratio and experimental pressure conditions. The pressure regulating valve 11 is located at the output end of the high-pressure reactor 9 and is connected to the acquisition and control device E. The pressure regulating valve 11 receives the experimental pressure corresponding to the current experiment and, based on the experimental pressure, regulates the pressure of the hydrogen-blended natural gas passing through the current pressure regulating valve position, thereby outputting hydrogen-blended natural gas that meets the experimental pressure. Additionally, a pressure gauge 10 is installed inside the high-pressure reactor 9. The pressure gauge 10 reflects the real-time pressure inside the reactor 9.

[0043] In addition, to ensure the safe delivery of hydrogen, refer to Figure 2 The hydrogen delivery channel described in this embodiment of the invention further includes a first one-way valve 3 disposed at the front end of the first booster pump 4, so as to ensure unidirectional delivery of hydrogen from the hydrogen source 1 to the reactor 9. Similarly, in order to ensure the safe delivery of natural gas, refer to... Figure 2 The natural gas transmission channel described in this embodiment of the invention also includes a second one-way valve 7 disposed at the front end of the second booster pump 8, so as to ensure the one-way transmission of natural gas from the natural gas source 5 to the reactor 9.

[0044] Furthermore, to ensure rapid start-up and backup start-up of hydrogen supply, refer to... Figure 2The hydrogen delivery channel described in this embodiment of the invention further includes a first shut-off valve 2 disposed between the hydrogen source 1 and the first one-way valve 3, for controlling the start and stop of hydrogen delivery using the first shut-off valve 2. Similarly, to ensure rapid start and stop and backup start and stop for natural gas delivery, refer to... Figure 2 The natural gas transmission channel described in this embodiment of the invention also includes a second shut-off valve 6 disposed between the natural gas source 5 and the second one-way valve 7, so as to control the start and stop of natural gas transmission using the second shut-off valve 6.

[0045] Further, refer to again Figure 2 The injection combustion device C described in this embodiment of the invention includes: an injection pipeline (not numbered), a nozzle 12, and an igniter 13. The input end of the injection pipeline is connected to the output end of the high-pressure reactor 9, and the output end of the injection pipeline is connected to the nozzle 12. The igniter 13 is located near the output end of the injection pipeline and is spaced apart from the output end of the injection pipeline. During application, the mixed hydrogen-blended natural gas that has reached the experimental pressure is output from the high-pressure reactor 9, passes through the injection pipeline, and after the igniter 13 is aligned with the output end of the injection pipeline and ignites the currently output hydrogen-blended natural gas, a jet flame matching the nozzle shape is ejected from the nozzle 12.

[0046] Further reference Figure 2 The observation device D described in this embodiment of the invention includes an infrared thermal imager 14 and a high-speed camera 15. The infrared thermal imager 14 is used to collect the temperature distribution and radiation characteristics of the jet fire emitted by the jet combustion device C. The high-speed camera 15 is used to collect the flame morphology characteristics of the jet fire emitted by the jet combustion device C. At this time, the acquisition and control device E is simultaneously connected to the infrared thermal imager 14 and the high-speed camera 15. The acquisition and control device E is used to statistically analyze the temperature distribution, radiation, and flame morphology characteristics of the jet fire under different experimental pressures and gas ratios.

[0047] In practical application, hydrogen is first supplied from hydrogen source 1 via a hydrogen supply pipeline, pressurized by the first booster pump 4, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the partial pressure of hydrogen. Then, the hydrogen supply is shut off. Next, natural gas is supplied from natural gas source 5 via a natural gas supply pipeline, pressurized by the second booster pump 8, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the experimental pressure. Afterward, the natural gas supply is shut off. Hydrogen and natural gas are thoroughly mixed in the high-pressure vessel 9 (mixing can be achieved using magnetic stirring). The hydrogen-blended natural gas, meeting the experimental pressure, is then introduced into the injection pipeline through the pressure regulating valve 11. Gas is ejected through nozzle 12 and ignited by igniter 13 to form a jet fire under the current experimental conditions. The changes in flame morphology under stable conditions are captured by infrared thermal imager 14 and high-speed camera 15, and the temperature distribution, radiation characteristics and flame morphology characteristics of the current jet fire are analyzed by acquisition and control device E. By changing the hydrogen blending ratio and adjusting the target pressure of the first booster pump 4, the second booster pump 8 and the pressure regulating valve 11, the jet fire behavior of hydrogen-blended natural gas under different transportation processes (different hydrogen blending ratios and different pressures) can be studied.

[0048] Example 2

[0049] Based on the above embodiment one, as Figure 2 As shown, the nozzle 12 in this embodiment of the invention is a nozzle that can be replaced with different leak hole morphologies. In this case, the data acquisition and control device E in this embodiment of the invention is also used to statistically analyze the temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the jet fire under different experimental pressures, different gas ratios, and different leak hole morphologies.

[0050] In practical application, hydrogen is first supplied from hydrogen source 1 via a hydrogen supply pipeline, pressurized by the first booster pump 4, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the partial pressure of hydrogen. Then, the hydrogen supply is shut off. Next, natural gas is supplied from natural gas source 5 via a natural gas supply pipeline, pressurized by the second booster pump 8, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the experimental pressure. Afterward, the natural gas supply is shut off. Hydrogen and natural gas are thoroughly mixed in the high-pressure vessel 9 (mixing can be achieved using magnetic stirring). The hydrogen-blended natural gas, meeting the experimental pressure, is then introduced into the injection pipeline through the pressure regulating valve 11. Gas is ejected through nozzle 12 and ignited by igniter 13 to form a jet fire under the current experimental conditions. The flame morphology changes under stable conditions are captured by infrared thermal imager 14 and high-speed camera 15, and the temperature distribution characteristics, radiation characteristics and flame morphology characteristics of the current jet fire are analyzed by acquisition and control device E. By changing nozzles 12 with different leakage hole morphologies, the temperature distribution characteristics, radiation characteristics and flame morphology characteristics of hydrogen-doped natural gas jet fire under different leakage hole morphologies are obtained, thereby obtaining the influence law of leakage hole morphology on the behavior of hydrogen-doped natural gas jet fire.

[0051] Example 3

[0052] Based on the above embodiment one, as Figure 2 As shown, the ignition energy of the igniter 13 described in this embodiment of the invention is adjustable. The igniter 13 is connected to a data acquisition and control device E, which is also used to control and adjust the ignition energy of the igniter 13. Furthermore, the data acquisition and control device E is also used to record the ignition energy information corresponding to the current experimental conditions.

[0053] In Example 3, the data acquisition and control device E is also used to statistically analyze the jet fire characteristics under different experimental pressures, different gas ratios, and different leak pore morphologies. These jet fire characteristics include the minimum ignition energy of hydrogen-blended natural gas, as well as the temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the jet fire.

[0054] In practical application, hydrogen is first supplied from hydrogen source 1 via a hydrogen supply pipeline, pressurized by the first booster pump 4, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the partial pressure of hydrogen. Then, the hydrogen supply is shut off. Next, natural gas is supplied from natural gas source 5 via a natural gas supply pipeline, pressurized by the second booster pump 8, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the experimental pressure. Afterward, the natural gas supply is shut off. Hydrogen and natural gas are thoroughly mixed in the high-pressure vessel 9 (mixing can be achieved using magnetic stirring). Through the pressure regulating valve 11, the hydrogen-blended natural gas meeting the experimental pressure is introduced into the injection pipeline. The acquisition and control device E regulates the ignition energy of the igniter 13, ensuring that the hydrogen-blended natural gas is properly ignited through the nozzle. After being ejected, the hydrogen-blended natural gas is ignited by an igniter 13 with adjustable ignition energy, forming a jet fire under the current hydrogen blending ratio, experimental pressure, and minimum ignition energy conditions. The flame morphology changes under stable conditions are captured by an infrared thermal imager 14 and a high-speed camera 15, and the minimum ignition energy, temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the current jet fire are analyzed by the acquisition and control device E. The minimum ignition energy, temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the hydrogen-blended natural gas jet fire under different hydrogen blending ratios and pressure conditions are obtained, thereby analyzing the influence of different ignition energies on the jet fire behavior.

[0055] Example 4

[0056] Based on the above embodiments two and three, as Figure 2 As shown, the nozzle 12 in this embodiment of the invention is a nozzle capable of being replaced with different leakage hole morphologies. Furthermore, the ignition energy of the igniter 13 in this embodiment of the invention is adjustable. The igniter 13 is connected to the acquisition and control device E, which is also used to control and adjust the ignition energy of the igniter 13. Further, the acquisition and control device E is also used to record the ignition energy information corresponding to the current experimental conditions.

[0057] At this time, the data acquisition and control device E is also used to statistically analyze the jet fire characteristics under different experimental pressures, different gas ratios, and different leak morphologies. The jet fire characteristics include: the minimum ignition energy of hydrogen-blended natural gas; as well as the temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the jet fire.

[0058] In practical application, hydrogen is first supplied from hydrogen source 1 via a hydrogen supply pipeline, pressurized by the first booster pump 4, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the partial pressure of hydrogen. Then, the hydrogen supply is shut off. Next, natural gas is supplied from natural gas source 5 via a natural gas supply pipeline, pressurized by the second booster pump 8, and then injected into the high-pressure vessel 9 until the pressure inside the vessel reaches the experimental target pressure. Then, the natural gas supply is shut off. Hydrogen and natural gas are thoroughly mixed in the high-pressure vessel 9 (mixing can be achieved using magnetic stirring). Through the pressure regulating valve 11, the hydrogen-blended natural gas meeting the experimental pressure is introduced into the injection pipeline. The ignition energy of the igniter 13 is adjusted by the acquisition and control device E, so that after the hydrogen-blended natural gas is ejected through the nozzle 12, the ignition energy is adjustable. Ignition device 13 ignites the injected hydrogen-blended natural gas, forming a jet fire under the current hydrogen blending ratio, experimental pressure, and minimum ignition energy conditions. The flame morphology changes under stable conditions are captured by infrared thermal imager 14 and high-speed camera 15, and the minimum ignition energy, temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the current jet fire are analyzed by acquisition and control device E. By replacing nozzles 12 with different leakage hole morphologies, the minimum ignition energy, temperature distribution characteristics, radiation characteristics, and flame morphology characteristics of the hydrogen-blended natural gas jet fire under different leakage hole morphologies are obtained, thereby obtaining the influence law of different leakage hole morphologies and different ignition energies on the behavior of hydrogen-blended natural gas jet fire.

[0059] Example 5

[0060] Based on the above embodiments one to four, the experimental system described in this embodiment of the invention further includes: an impurity addition device 17. Figure 3 This is a schematic diagram illustrating the specific structure of a second example of a system for implementing a hydrogen-doped natural gas injection fire experiment, as described in this application. Figure 3 As shown, the impurity addition device 17 is connected to the high-pressure reactor 9. After the gas supply device A successively adds the hydrogen and natural gas required for the current experiment to the high-pressure reactor 9, the impurity addition device 17 is also used to add the impurity to be studied required for the current experiment to the high-pressure reactor 9 in the blending device B. In this embodiment of the invention, the impurity to be studied is a single impurity or multiple synergistic impurities.

[0061] Compared to Examples 1-4, the experimental system described in Example 5 further includes an impurity addition device 17, which can add impurities to be studied (e.g., one or more of the following: gas, dust, and particulate matter) to the hydrogen-blended natural gas as needed for the experiment. In Example 5, the impurities to be studied can be used as variables. After completing any of the aforementioned examples, by adding different types and combinations of impurities at different concentrations, the influence of impurity parameters on the jet fire behavior formed under the synergistic effect with hydrogen-blended natural gas can be studied.

[0062] Example 6

[0063] Based on Embodiments 1 to 5 above, this invention also provides a method for conducting a hydrogen-doped natural gas injection fire experiment (hereinafter referred to as the "experimental method"). This experimental method is implemented using the aforementioned experimental system.

[0064] Figure 4 This is a schematic diagram illustrating the steps of a method for conducting a hydrogen-doped natural gas injection fire experiment according to an embodiment of this application. Figure 4 As shown, the experimental method described in this embodiment of the invention includes the following steps:

[0065] Step S401: According to the preset gas ratio and the experimental pressure containing partial pressure information, the gas supply device A sequentially delivers hydrogen and natural gas that meet the experimental partial pressure to the blending device B.

[0066] In step S402, the mixing device B mixes the hydrogen and natural gas according to the experimental pressure.

[0067] In step S403, hydrogen-blended natural gas is injected and ignited by the injection combustion device C to form a jet fire;

[0068] Step S404: The observation device D captures the current changing state of the jet fire;

[0069] Step S405: The acquisition and control device E analyzes the characteristics of the jet fire under the current experimental conditions based on the current changes in the jet fire.

[0070] This invention discloses a system and method for conducting jet fire experiments on hydrogen-blended natural gas. This system and method can study the minimum ignition energy and jet fire characteristics (temperature distribution, radiation characteristics, flame morphology, etc.) of hydrogen-blended natural gas under different hydrogen blending ratios, pressures, leak morphologies, and impurities. This provides experimental basis and theoretical support for the safe transportation and risk assessment of hydrogen-blended natural gas pipelines, and is of great significance for developing safe transportation processes for hydrogen-blended natural gas pipelines, assessing pipeline safety risks, and realizing large-scale safe hydrogen energy transportation. Specifically, this invention can achieve the following jet fire experimental studies of hydrogen-blended natural gas:

[0071] 1. Capable of studying the jet fire behavior of hydrogen-blended natural gas with different hydrogen blending ratios and pressures;

[0072] 2. It can study the influence of different leakage hole morphologies on the jet fire behavior of hydrogen-doped natural gas;

[0073] 3. It can study the influence of impurities on the jet fire behavior of hydrogen-blended natural gas;

[0074] 4. It can study the minimum ignition energy of hydrogen-blended natural gas under different operating conditions (different hydrogen blending ratios, pressures, pore morphology, impurities).

[0075] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention (for example, replacing one or both of gas source 1 and gas source 5 with other types of combustible gas to study the high-pressure jet fire behavior of other types of combustible gases) should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0076] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0077] The phrase "an embodiment" or "an embodiment" used in this specification means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0078] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection of this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A system for conducting hydrogen-doped natural gas injection fire experiments, characterized in that, include: The gas supply device is used to sequentially deliver hydrogen and natural gas that meet the experimental partial pressure according to the preset gas ratio and the experimental pressure containing partial pressure information to the blending device. The mixing device is used to fully mix the hydrogen and natural gas by magnetic stirring according to the experimental pressure. A jet combustion device, used to inject hydrogen-blended natural gas and ignite it to form a jet fire; An observation device for capturing the changing state of the jet fire; An impurity addition device is also used to add the impurity to be studied for the current experiment to the mixing device, wherein the impurity to be studied is a single impurity or multiple synergistic impurities. A data acquisition and control device is used to analyze the characteristics of the jet fire under current experimental conditions based on the changing state of the jet fire, wherein the jet combustion device includes: The injection pipe is connected to the output end of the reactor in the mixing device; A nozzle connected to the output end of the injection pipeline, wherein the nozzle is a nozzle with interchangeable leakage hole morphologies; An igniter is disposed near the output end of the injection pipe, and the ignition energy of the igniter is adjustable. The acquisition and control device is also used to statistically analyze the jet fire characteristics under different experimental pressures, different gas ratios, different leak hole morphologies, different combinations of impurity types, and different concentrations of impurities. The jet fire characteristics include the temperature distribution characteristics, radiation characteristics, flame morphology characteristics, and minimum ignition energy of hydrogen-blended natural gas.

2. The system according to claim 1, characterized in that, The gas supply device includes: A hydrogen delivery channel includes a hydrogen source, a hydrogen delivery pipeline connected to the hydrogen source and the mixing device, and a first booster pump installed on the hydrogen delivery pipeline. A natural gas transmission channel includes a natural gas source, a natural gas transmission pipeline connected to the natural gas source and the blending device, and a second booster pump installed on the natural gas transmission pipeline.

3. The system according to claim 1 or 2, characterized in that, The mixing device includes: High-pressure reactor, used to mix gases by magnetic stirring; A pressure regulating valve, which is located at the output end of the high-pressure reactor and connected to the acquisition and control device, is used to generate hydrogen-blended natural gas that meets the experimental pressure.

4. The system according to claim 1 or 2, characterized in that, The observation device includes an infrared thermal imager and a high-speed camera.

5. The system according to claim 2, characterized in that, The hydrogen delivery channel further includes a first check valve disposed at the front end of the first booster pump; The natural gas transmission channel also includes a second check valve located at the front end of the second booster pump.

6. The system according to claim 5, characterized in that, The hydrogen delivery channel further includes a first shut-off valve disposed between the hydrogen source and the first one-way valve. The natural gas transmission channel further includes a second shut-off valve disposed between the natural gas source and the second check valve.

7. A method for conducting hydrogen-doped natural gas injection fire experiments, characterized in that, The method is implemented using the system as described in any one of claims 1 to 6, and the method includes: According to the preset gas ratio and the experimental pressure containing partial pressure information, the gas supply device sequentially delivers hydrogen and natural gas that meet the experimental partial pressure to the blending device. The mixing device is used to mix the hydrogen and natural gas according to the experimental pressure; The injection combustion device injects hydrogen-blended natural gas and ignites it to form a jet fire; The observation device captures the changing state of the jet fire; The acquisition and control device analyzes the characteristics of the jet fire under the current experimental conditions based on the changing state of the jet fire.

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