Dynamically adjustable natural gas / hydrogen mixing device

Abstract

The invention discloses a dynamic adjustable natural gas / hydrogen mixing device, the mixing device adopts a vertical cylinder structure, the mixing device comprises an outer layer shell, an inner layer shell, a turbulent flow element and a driving mechanism, the outer layer shell and the inner layer shell are coaxially arranged, the inner wall of the outer layer shell and the outer wall of the inner layer shell are spaced in the radial direction of the outer layer shell, and the turbulent flow element is arranged in the outer layer shell. The turbulent flow element is movably arranged in the outer-layer shell in the axial direction of the inner-layer shell, partially extends into the inner-layer shell and is used for promoting full mixing of hydrogen and natural gas; and the driving mechanism is arranged at the lower end of the outer-layer shell, is connected with the turbulent flow element and is used for driving the turbulent flow element to move in the axial direction of the inner-layer shell. According to the mixing device, the working conditions of different flows and natural gas / hydrogen mixing proportions can be adapted, so that the mixing uniformity is optimized, meanwhile, the system pressure drop is reduced, and the fuel gas conveying economy is improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of gas mixing, and in particular to a dynamically adjustable natural gas / hydrogen mixing device. Background Art

[0002] With the growing global demand for clean energy, natural gas hydrogen blending technology has garnered widespread attention as a key approach to achieving low-carbon and clean energy. This technology not only significantly reduces carbon emissions during combustion but also provides a scalable transitional solution toward a low-carbon and zero-carbon future energy system.

[0003] However, hydrogen and natural gas have significant differences in physical and chemical properties, which poses many challenges to their mixing technology. Existing static mixers mainly achieve mixing by disturbing and shearing the gas through built-in fixed structures (such as turbulent elements or grids). However, this design has limitations in adapting to dynamic changes in mixing ratios and gas conditions. At low mixing ratios or low flow rates, the gas residence time in the static mixer is too long, resulting in additional system pressure drop; at high mixing ratios or high flow rates, the gas may flow out without being fully mixed, affecting the combustion efficiency of downstream equipment. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a dynamically adjustable natural gas / hydrogen mixing device that can adapt to operating conditions with varying flow rates and natural gas / hydrogen blending ratios, thereby optimizing mixing uniformity while reducing system pressure drop and improving the economic efficiency of gas transportation.

[0005] According to an embodiment of the present invention, a dynamically adjustable natural gas / hydrogen mixing device adopts a vertical cylindrical structure, comprising an outer shell, the upper end of which is open; an inner shell, the lower end of which is open, and the lower end of the inner shell extends into the outer shell from the upper open end of the outer shell, the outer shell and the inner shell are coaxially arranged, the inner wall of the outer shell and the outer wall of the inner shell are spaced apart in the radial direction of the outer shell, a hydrogen inlet is provided on the upper part of the outer shell, and the hydrogen inlet is provided on the upper side of the lower end of the inner shell, A natural gas inlet is provided at the lower portion of the outer shell, and the natural gas inlet is provided at the lower side of the inner shell; a mixer outlet is provided at the upper end of the inner shell, and the mixer outlet is provided at the upper side of the outer shell; a spoiler element is movably provided in the outer shell along the axial direction of the inner shell and partially extends into the inner shell, for promoting sufficient mixing of hydrogen and natural gas; a driving mechanism is provided at the lower end of the outer shell, and the driving mechanism is connected to the spoiler element, for driving the spoiler element to move along the axial direction of the inner shell.

[0006] According to an embodiment of the present invention, a dynamically adjustable natural gas / hydrogen mixing device is provided with a driving mechanism at the lower end of an outer shell, the driving mechanism being connected to a flow-disrupting element, the flow-disrupting element being movably disposed within the outer shell along the axial direction of the inner shell and partially extending into the inner shell. Movement of the flow-disrupting element can achieve full mixing of hydrogen and natural gas, drive the hydrogen and natural gas mixture upward, and guide the hydrogen and natural gas mixture to the mixer outlet, thereby fully guiding the mixed gas. At the same time, the driving mechanism adjusts the depth of the flow-disrupting element extending into the inner shell, enabling the mixing device to adapt to operating conditions with different flow rates and natural gas / hydrogen blending ratios, thereby optimizing mixing uniformity, reducing system pressure drop, and improving the economic efficiency of gas transportation.

[0007] In some embodiments of the present invention, the driving mechanism includes: a piston, which is arranged at the lower end of the outer shell, the piston abuts against the inner circumferential wall of the outer shell, the piston and the lower end of the inner wall of the outer shell jointly define a fire-resistant oil cavity for accommodating the fire-resistant oil, and the piston is connected to the spoiler element for driving the spoiler element to move along the axial direction of the inner shell.

[0008] In some embodiments of the present invention, an oil inlet hole and an oil outlet hole are provided at the bottom of the fire-resistant oil cavity for controlling the amount of oil in the fire-resistant oil cavity and for controlling the movement of the piston along the axial direction of the inner shell.

[0009] In some embodiments of the present invention, a boss is provided on the inner wall of the outer shell, and the oil inlet and the oil outlet respectively pass through the boss. When the piston moves toward the bottom wall close to the outer shell to the extreme position, the piston stops at the boss.

[0010] In some embodiments of the present invention, a limiting protrusion is provided on the inner peripheral wall of the outer shell, and the limiting protrusion is provided at the upper end of the piston and at the lower side of the natural gas inlet. When the piston moves toward the bottom wall away from the outer shell to the limit position, the piston stops at the limiting protrusion.

[0011] In some embodiments of the present invention, the outer shell includes a shell body and an oil storage part, the upper and lower ends of the shell body are open, and the lower end of the inner shell extends into the shell body from the open opening at the upper end of the shell body; the upper end of the oil storage part is open, and the oil storage part is arranged at the lower end of the shell body and is detachably connected to the shell body.

[0012] In some embodiments of the present invention, the dynamically adjustable natural gas / hydrogen mixing device further includes: a hydrogen concentration monitor, which is disposed on the top of the inner shell and is used to monitor the hydrogen concentration in the mixed gas in real time; and a differential pressure sensor, which is disposed between the hydrogen inlet and the natural gas inlet and is used to monitor the pressure difference within the mixing device.

[0013] In some embodiments of the present invention, the dynamically adjustable natural gas / hydrogen mixing device further includes: a data acquisition module, which is used to receive real-time monitoring data from the hydrogen concentration monitor and the pressure difference sensor; a control system, which is electrically connected to the data acquisition module and the drive mechanism, and is used to adjust the depth of the spoiler element extending into the inner shell according to the real-time monitoring data.

[0014] In some embodiments of the present invention, the hydrogen concentration monitor is provided with a plurality of sampling points, and the plurality of sampling points are arranged at intervals on the top of the inner shell.

[0015] In some embodiments of the present invention, along the circumferential direction of the outer shell, the mixer outlet is spaced apart from both the natural gas inlet and the hydrogen inlet.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram of the interior of an outer shell and an inner shell of a mixing device according to an embodiment of the present invention; Figure 2 is a schematic diagram of sampling points of a hydrogen concentration monitor according to one embodiment of the present invention; Figure 3 is a schematic diagram of sampling points of a hydrogen concentration monitor according to another embodiment of the present invention; Figure 4 is a schematic diagram of sampling points of a hydrogen concentration monitor according to yet another embodiment of the present invention; Figure 5 is a schematic diagram of a mixing device according to an embodiment of the present invention.

[0018] Reference numerals: 100. Mixing device; 1. Outer shell; 11. Hydrogen inlet; 12. Natural gas inlet; 13. Boss; 14. Limiting protrusion; 15. Shell body; 16. Oil storage part; 2. Inner shell; 21. First channel; 22. Mixer outlet; 3. Spoiler element; 4. Drive mechanism; 41. Piston; 42. Fire-resistant oil chamber; 421. Oil inlet; 422. Oil outlet; 43. Oil pump; 44. First oil tank; 45. External oil pipeline; 451. Outlet electric valve; 5. Hydrogen concentration monitor; 51. Sampling point; 6. Differential pressure sensor; 7. Control system. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0021] Reference below Figure 1-Figure 5 Describe the dynamically adjustable natural gas / hydrogen mixing device 100 according to an embodiment of the present invention like Figure 1 As shown, the dynamically adjustable natural gas / hydrogen mixing device 100 according to an embodiment of the present invention includes an outer shell 1 , an inner shell 2 , a flow-turbulating element 3 and a driving mechanism 4 .

[0022] Specifically, the mixing device 100 adopts a vertical cylindrical structure, and the axial direction of the mixing device 100 is along the up-down direction (such as Figure 1 The upper and lower directions shown extend.

[0023] The upper end of the outer shell 1 is open, the lower end of the inner shell 2 is open, and the lower end of the inner shell 2 extends into the outer shell 1 from the upper end opening of the outer shell 1, making the assembly of the outer shell 1 and the inner shell 2 relatively simple.

[0024] The outer shell 1 and the inner shell 2 are coaxially arranged, and the inner wall of the outer shell 1 and the outer wall of the inner shell 2 are spaced apart in the radial direction of the outer shell 1, so that a first channel 21 for gas circulation is formed between the inner shell 2 and the outer shell 1.

[0025] A hydrogen inlet 11 is provided at the top of the outer shell 1, located above the lower end of the inner shell 2. A natural gas inlet 12 is provided at the bottom of the outer shell 1, located below the inner shell 2. It is understood that hydrogen enters the first passage 21 from the hydrogen inlet 11 and flows to the underside of the inner shell 2 under the guidance of the first passage 21. Natural gas enters the interior of the outer shell 1 from the natural gas inlet 12 and is located below the inner shell 2, where the hydrogen and natural gas are initially mixed.

[0026] like Figure 1 As shown, the upper end of the inner shell 2 is provided with a mixer outlet 22, which is located on the upper side of the outer shell 1. The spoiler element 3 is movably disposed within the outer shell 1 along the axial direction of the inner shell 2 and partially extends into the inner shell 2, which is used to promote the thorough mixing of hydrogen and natural gas. The movement of the spoiler component produces a turbulent effect, which can achieve thorough mixing of hydrogen and natural gas and drive the hydrogen and natural gas mixture upward, thereby guiding the hydrogen and natural gas mixture to the mixer outlet 22, thereby ensuring thorough guidance of the mixed gas. The mixed gas after thorough mixing of natural gas and hydrogen can not only significantly reduce the carbon emission intensity during the combustion process, but also provide a scalable transition solution for building a low-carbon and zero-carbon future energy system.

[0027] like Figure 1 As shown, the driving mechanism 4 is provided at the lower end of the outer shell 1 and is connected to the flow-turbulating element 3 for driving the flow-turbulating element 3 to move in the axial direction of the inner shell 2. The flow-turbulating and guiding effects of the flow-turbulating element 3 can be achieved automatically, eliminating the need for manual actuation of the flow-turbulating element 3, increasing the mixing effect of the flow-turbulating element 3 on hydrogen and natural gas, and facilitating the mixed gas to flow out of the mixing device 100 from the mixer outlet 22.

[0028] At the same time, the driving mechanism 4 adjusts the depth of the spoiler element 3 extending into the inner shell 2, so that the mixing device 100 can adapt to working conditions with different flow rates and natural gas / hydrogen mixing ratios, thereby optimizing the mixing uniformity, while reducing the system pressure drop and improving the economy of gas transportation.

[0029] According to the mixing device 100 of the embodiment of the present invention, by arranging the driving mechanism 4 at the lower end of the outer shell 1, the driving mechanism 4 is connected to the spoiler element 3, and the spoiler element 3 is movably arranged in the outer shell 1 along the axial direction of the inner shell 2 and partially extends into the inner shell 2. The movement of the spoiler assembly can achieve full mixing of hydrogen and natural gas, and drive the mixed gas of hydrogen and natural gas upward, and can guide the mixed gas of hydrogen and natural gas to the mixer outlet 22, so that the mixed gas is fully guided. At the same time, by adjusting the depth of the spoiler element 3 extending into the inner shell 2 through the driving mechanism 4, the mixing device 100 can adapt to the working conditions of different flow rates and natural gas / hydrogen blending ratios, thereby optimizing mixing uniformity, reducing system pressure drop, and improving the economy of gas transportation.

[0030] In some embodiments of the present invention, Figure 1 As shown, the driving mechanism 4 includes a piston 41, which is arranged at the lower end of the outer shell 1. The piston 41 abuts against the inner circumferential wall of the outer shell 1. The piston 41 and the lower end of the inner wall of the outer shell 1 jointly define a fire-resistant oil chamber 42 for accommodating the fire-resistant oil. The piston 41 is connected to the spoiler element 3 and is used to drive the spoiler element 3 to move along the axial direction of the inner shell 2.

[0031] It is understood that by varying the amount of resistant oil within the resistant oil chamber 42, the position of the piston 41 within the outer shell 1 can be adjusted, and the penetration depth of the spoiler 3 within the inner shell 2 can be dynamically adjusted. Furthermore, the resistant oil chamber 42 houses a hydraulic drive system, which avoids the risk of sparks from electronically controlled components in a hydrogen environment and improves the explosion-proof safety of the equipment.

[0032] In some embodiments of the present invention, Figure 1 As shown, the bottom of the fire-resistant oil chamber 42 is provided with an oil inlet hole 421 and an oil outlet hole 422, which are used to control the amount of oil in the fire-resistant oil chamber 42 and to control the axial movement of the piston 41 along the inner shell 2. The oil inlet hole 421 can be connected to the oil pump 43 and the first oil tank 44, and the oil outlet hole 422 can be connected to the external oil pipeline 45 and the first oil tank 44 to control the up and down movement of the piston 41, thereby adjusting the insertion depth of the spoiler 3. The external oil pipeline 45 is provided with an outlet electric valve 451 to control the opening and closing of the external oil pipeline 45. In some embodiments of the present invention, Figure 1 As shown, a boss 13 is provided on the inner wall of the outer shell 1. An oil inlet hole 421 and an oil outlet hole 422 extend through the boss 13. When the piston 41 moves toward the bottom wall of the outer shell 1 to its limit position, the piston 41 abuts against the boss 13. If the anti-fuel leak occurs, gravity and internal pressure will cause the piston 41 to abut against the boss 13, automatically closing the oil inlet hole 421 and the oil outlet hole 422, thereby preventing gas leakage from the mixing device 100.

[0033] In some embodiments of the present invention, Figure 1 As shown, a stopper protrusion 14 is provided on the inner circumferential wall of the outer shell 1. When the piston 41 moves toward the bottom wall away from the outer shell 1 to the limit position, the piston 41 abuts against the stopper protrusion 14. This serves to limit the maximum stroke of the piston 41, preventing its movement from exceeding a predetermined range, preventing the piston 41 from continuing to move upward, and preventing the piston 41 from sealing the opening at the lower end of the inner shell 2, thereby preventing the mixed gas in the outer shell 1 from entering the inner shell 2. Furthermore, the stopper protrusion 14 is located at the upper end of the piston 41 and below the natural gas inlet 12, preventing the fire-resistant oil from flowing out of the outer shell 1 through the natural gas inlet 12 and contaminating the natural gas with the fire-resistant oil.

[0034] In some embodiments of the present invention, the outer shell 1 includes a shell body 15 and an oil storage portion 16. The upper and lower ends of the shell body 15 are open. The lower end of the inner shell 2 extends into the shell body 15 from the upper open end of the shell body 15. The upper end of the oil storage portion 16 is open. The oil storage portion 16 is arranged at the lower end of the shell body 15 and is detachably connected to the shell body 15. The oil storage portion 16 and the shell body 15 can be separated relatively easily, which is convenient for removing the piston 41 and the spoiler element 3, and is convenient for maintaining and replacing spoiler elements 3 of different structures, adapting to working conditions with different hydrogen blending ratios and airflow characteristics, making the operation of the mixing device 100 more economical and flexible, and having a wider application prospect.

[0035] In this embodiment, the shell body 15 and the oil storage portion 16 are connected by threads or flanges.

[0036] In some embodiments of the present invention, Figure 1 As shown, the mixing device 100 also includes a hydrogen concentration monitor 5 and a pressure differential sensor 6. The hydrogen concentration monitor 5 is arranged on the top of the inner shell 2, and is used to monitor the hydrogen concentration in the mixed gas in real time, so as to facilitate the acquisition of the hydrogen concentration in the mixed gas produced by mixing natural gas and hydrogen, and to facilitate confirmation of whether the concentration requirements of the mixed gas are met; the pressure differential sensor 6 is arranged between the hydrogen inlet 11 and the natural gas inlet 12, and is used to monitor the pressure difference in the mixing device 100, avoid the pressure difference in the mixing device 100, and avoid safety accidents.

[0037] Furthermore, if Figure 1 and Figure 5As shown, the mixing device 100 further includes a data acquisition module and a control system 7. The data acquisition module is configured to receive real-time monitoring data from the hydrogen concentration monitor 5 and the differential pressure sensor 6. The control system 7 is electrically connected to both the data acquisition module and the drive mechanism 4. The control system 7 is configured to adjust the depth of the spoiler element 3 extending into the inner shell 2 based on the real-time monitoring data. The data acquisition module processes the real-time data collected from the hydrogen concentration monitor 5 and the differential pressure sensor 6. The control system 7 automatically adjusts the drive mechanism 4 based on the real-time data from the hydrogen concentration monitor 5 and the differential pressure sensor 6, thereby dynamically adjusting the insertion depth of the spoiler element 3. This ensures that the mixing uniformity does not fall below a preset requirement (e.g., mixing uniformity ≥95%) while minimizing pressure drop, thereby achieving optimal mixing of natural gas and hydrogen while minimizing system pressure drop.

[0038] In this embodiment, drive mechanism 4 is hydraulically driven, reducing the use of electronic control components and preventing sparks during operation. All sensors that come into direct contact with the mixed gas (such as the hydrogen concentration monitor 5 and the differential pressure sensor 6) utilize components that meet explosion-proof standards to avoid safety accidents such as explosions.

[0039] In some embodiments of the present invention, Figure 2-4 As shown, the hydrogen concentration monitor 5 is equipped with multiple sampling points 51 spaced apart at intervals across the top of the inner shell 2. The hydrogen concentration in the mixed gas can be monitored at multiple locations and averaged by the data acquisition module, increasing the reliability of the hydrogen concentration derived by the data processing module. The multiple sampling points 51 are evenly spaced across the top plane of the mixing device 100. Each sampling point 51 can sample individually or in rotation using a switching valve. The sampled hydrogen concentrations are used to calculate the mixing uniformity of the mixed gas at the mixer outlet 22.

[0040] In some embodiments of the present invention, Figure 1 As shown, along the circumferential direction of the outer shell 1, the mixer outlet 22 is spaced apart from the natural gas inlet 12 and the hydrogen inlet 11, so as to prevent the internal pressure of the inner shell 2 and the outer shell 1 from being concentrated at the mixer outlet 22, the natural gas inlet 12 and the hydrogen inlet 11, thereby preventing the inner shell 2 and / or the outer shell 1 from being damaged due to excessive pressure.

[0041] In some embodiments of the present invention, the flow-disturbing element 3 may adopt different forms of static mixer structures, one end of which is fixedly connected to the piston 41 and the other end extends into the inner shell 2 to disturb the mixed airflow and enhance the mixing effect.

[0042] like Figure 1-Figure 5 As shown, in actual operation, the working process of the mixing device 100 mainly includes the following steps: After natural gas and hydrogen enter the outer shell 1 through their respective natural gas inlet 12 and hydrogen inlet 11, they are initially mixed at the bottom of the inner shell 2. The two gases then flow upward into the inner shell 2, where they are turbulently mixed by the flow-turbulating element 3. This allows the two gases to be fully mixed. The mixed gas is then discharged from the mixer outlet 22 and transported to downstream equipment.

[0043] During the mixing process, the hydrogen concentration monitor 5 samples the hydrogen concentration at the top wall of the inner shell 2 located at the upper end of the mixer outlet 22 in real time, for example, Figure 2 As shown, there are four sampling points 51, one of which is located at the center of the top of the inner shell 2, and the other three sampling points 51 are evenly distributed in a circle and the center of the circle coincides with the center of the top of the inner shell 2; Figure 3 As shown, there are 7 sampling points 51, one of which is located at the center of the top of the inner shell 2, three sampling points 51 are evenly distributed in a circle and the center of the circle coincides with the center of the top of the inner shell 2, and the remaining three sampling points 51 are evenly distributed in a circle and are concentric with another group of evenly distributed sampling points 51. The two groups of evenly distributed sampling points 51 are alternately arranged in the circumferential direction; Figure 4 As shown, there are 9 sampling points 51 arranged in 3 rows and 3 columns, wherein the sampling points 51 in 2 rows and 2 columns are located at the center of the top of the inner shell 2. The sampling points 51 can be selected according to design requirements to ensure uniformity of sampling.

[0044] At the same time, the differential pressure sensor 6 monitors the pressure drop generated during the mixing process. The monitored data is transmitted to the adjacent Figure 5 The control system 7 shown automatically calculates adjustment parameters and outputs control signals to the drive mechanism 4 based on the set mixing uniformity target (for example, mixing uniformity is not less than 95%) and the optimization requirement of the system pressure drop.

[0045] When monitoring data indicates that mixing uniformity falls below design requirements (e.g., mixing uniformity <95%), control system 7 activates oil pump 43, pumping fire-resistant oil from first oil tank 44 into fire-resistant oil chamber 42. Hydraulic pressure is applied through oil inlet 421, causing piston 41 to rise, thereby extending flow disruptor 3 further into inner shell 2 and enhancing airflow disturbance until mixing uniformity meets design requirements. Conversely, when mixing uniformity meets predetermined requirements and the system pressure drop is high, control system 7 opens outlet electric valve 451. Under the influence of gas pressure within outer shell 1 and inner shell 2, piston 41 descends, discharging fire-resistant oil through oil outlet 422 into first oil tank 44. This shortens the penetration depth of flow disruptor 3 and reduces the pressure drop within outer shell 1 and inner shell 2. After achieving optimal matching, outlet electric valve 451 is closed.

[0046] Attachment Figure 5The data acquisition and control system 7 shown implements closed-loop monitoring and automatic adjustment of the operating status of the mixing device 100. By collecting real-time hydrogen concentration and pressure drop data, the control system 7 not only achieves a dynamic balance between mixing uniformity and pressure drop, but also ensures fast system response and high regulation accuracy through feedback regulation, thereby improving overall operating efficiency and economy.

[0047] Through the above design, the present invention achieves the following technical effects: Efficient mixing and self-adaptation: Utilizing the dynamically adjustable turbulence element 3, natural gas and hydrogen are fully mixed in the mixer, ensuring that the mixing uniformity always meets the set target (mixing uniformity ≥ 95%). Through the closed-loop control of the data acquisition and control system 7, dynamic adjustment to different operating conditions is achieved, ensuring that the equipment can operate stably and efficiently under various operating conditions.

[0048] Reduce pressure drop: By monitoring the pressure drop of the mixed gas in real time and adjusting the penetration depth of the spoiler 3 based on the feedback, the system pressure drop can be optimized and energy loss can be reduced; Explosion-proof safety: The drive mechanism 4 is driven by fire-resistant oil, avoiding the use of electronic control components in flammable media environments such as hydrogen, thereby eliminating the risk of sparks. At the same time, all sensors that directly contact the mixed gas use explosion-proof components; Easy maintenance: The shell body 15 and the oil storage part 16 are connected by threads or flanges, which makes it easy to disassemble and replace the spoiler element 3, reducing the cost of equipment maintenance and upgrades; In summary, the present invention provides a natural gas / hydrogen mixing device 100 with a dynamic adjustment function. By adopting a vertical cylindrical structure, coaxially nested annular sandwich channels, a dynamically adjustable spoiler element 3 and a fully hydraulic drive mechanism 4, combined with real-time monitoring of hydrogen concentration and pressure drop data, the device can achieve optimal mixing effect and minimum pressure drop matching under different working conditions. At the same time, the hydraulic drive and detachable design ensure the safety and ease of maintenance of the equipment. The above technical solution not only solves the problems of uneven mixing or excessive pressure drop of existing static mixers when adapting to flow changes, but also provides an efficient and reliable technical solution for the field of natural gas hydrogen blending and other gas mixing.

[0049] Other structures and operations of the dynamically adjustable natural gas / hydrogen mixing device 100 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0050] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A dynamically adjustable natural gas / hydrogen mixing device, characterized in that: The mixing device adopts a vertical cylinder structure, comprising: an outer shell, the upper end of which is open; an inner shell, wherein the lower end of the inner shell is open, and the lower end of the inner shell extends into the outer shell from the upper open end of the outer shell, the outer shell and the inner shell are coaxially arranged, the inner wall of the outer shell and the outer wall of the inner shell are spaced apart in the radial direction of the outer shell, a hydrogen inlet is provided at the upper portion of the outer shell, the hydrogen inlet is provided on the upper side of the lower end of the inner shell, a natural gas inlet is provided at the lower portion of the outer shell, the natural gas inlet is provided on the lower side of the inner shell, and a mixer outlet is provided at the upper end of the inner shell, the mixer outlet is provided on the upper side of the outer shell; a flow-disturbing element, the flow-disturbing element being movably disposed in the outer shell along the axial direction of the inner shell and partially extending into the inner shell, for promoting sufficient mixing of hydrogen and natural gas; A driving mechanism is provided at the lower end of the outer shell, and the driving mechanism is connected to the spoiler element, and is used for driving the spoiler element to move along the axial direction of the inner shell.

2. The dynamically adjustable natural gas / hydrogen mixing device according to claim 1, characterized in that: The driving mechanism comprises: A piston is provided at the lower end of the outer shell, the piston abuts against the inner circumferential wall of the outer shell, the piston and the lower end of the inner wall of the outer shell jointly define a fire-resistant oil cavity for accommodating the fire-resistant oil, and the piston is connected to the spoiler element for driving the spoiler element to move along the axial direction of the inner shell.

3. The dynamically adjustable natural gas / hydrogen mixing device according to claim 2, characterized in that: An oil inlet hole and an oil outlet hole are provided at the bottom of the fire-resistant oil cavity for controlling the amount of oil in the fire-resistant oil cavity and for controlling the movement of the piston along the axial direction of the inner shell.

4. The dynamically adjustable natural gas / hydrogen mixing device according to claim 3, characterized in that: A boss is provided on the inner wall of the outer shell, and the oil inlet hole and the oil outlet hole respectively pass through the boss. When the piston moves toward the bottom wall close to the outer shell to the limit position, the piston abuts against the boss.

5. The dynamically adjustable natural gas / hydrogen mixing device according to claim 2, characterized in that: A limiting protrusion is provided on the inner peripheral wall of the outer shell. The limiting protrusion is provided at the upper end of the piston and at the lower side of the natural gas inlet. When the piston moves toward the bottom wall away from the outer shell to the limit position, the piston stops at the limiting protrusion.

6. The dynamically adjustable natural gas / hydrogen mixing device according to claim 2, characterized in that: The outer shell comprises: The shell body is open at both upper and lower ends, and the lower end of the inner shell extends into the shell body from the upper open end of the shell body; The oil storage portion has an open upper end and is disposed at the lower end of the shell body and is detachably connected to the shell body.

7. The dynamically adjustable natural gas / hydrogen mixing device according to claim 1, characterized in that: Also includes: A hydrogen concentration monitor, which is disposed on the top of the inner shell and is used to monitor the hydrogen concentration in the mixed gas in real time; A differential pressure sensor is provided between the hydrogen inlet and the natural gas inlet, and is used to monitor the pressure difference in the mixing device.

8. The dynamically adjustable natural gas / hydrogen mixing device according to claim 7, characterized in that: Also includes: A data acquisition module, the data acquisition module is used to receive real-time monitoring data from the hydrogen concentration monitor and the pressure difference sensor; A control system is electrically connected to the data acquisition module and the driving mechanism, and is used to adjust the depth of the spoiler extending into the inner shell according to the real-time monitoring data.

9. The dynamically adjustable natural gas / hydrogen mixing device according to claim 7, characterized in that: The hydrogen concentration monitor is provided with a plurality of sampling points, and the plurality of sampling points are arranged at intervals on the top of the inner shell.

10. The dynamically adjustable natural gas / hydrogen mixing device according to claim 1, characterized in that: Along the circumferential direction of the outer shell, the mixer outlet is spaced apart from both the natural gas inlet and the hydrogen inlet.

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