Variable-diameter pipeline natural gas hydrogen-doped mixer

Abstract

The reducing type pipeline natural gas hydrogen-doped mixer comprises a mixer main pipeline, the inlet end of the mixer main pipeline is provided with a reducing taper pipe section extending inwards, the small-diameter end of the reducing taper pipe section is communicated with a hole type injection pipe section, and a hydrogen conveying inlet pipeline is arranged on the side wall of the mixer main pipeline in a sealed and penetrating mode; an outlet of the hydrogen conveying inlet pipeline communicates with an injection hole of the hole type injection pipe section, and hydrogen enters the hole type injection pipe section through the hydrogen conveying inlet pipeline in a cross flow jet flow mode to be mixed with natural gas. A variable-diameter static mixer is further arranged in the mixer main pipeline, the small-diameter section of the variable-diameter static mixer can be inserted into the hole type injection pipe section, and the large-diameter section of the variable-diameter static mixer is arranged at the position, close to the outlet end, in the mixer main pipeline. The flow speed of natural gas is increased through the gradually-shrunk taper pipe section, jet flow acceleration of hydrogen is achieved through the hole type injection pipe section, kinetic energy of the natural gas and the hydrogen is fully utilized, and rapid, uniform and efficient mixing of hydrogen doped natural gas can be well achieved.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas hydrogen blending, and in particular to a variable diameter pipeline natural gas hydrogen blending mixer. Background Art

[0002] As the use of efficient and clean energy becomes more and more popular, hydrogen is emerging as a low-carbon and clean energy recognized worldwide. At present, some countries have established a relatively complete natural gas transportation pipeline network system, which can blend hydrogen with natural gas to form hydrogen-blended natural gas and then be incorporated into the national natural gas pipeline network, so as to realize the cross-provincial transportation and utilization of hydrogen energy at a low cost, thereby effectively promoting the large-scale consumption of hydrogen energy.

[0003] However, there are still many unresolved issues regarding the application of natural gas blended with hydrogen. Among them, the material safety of hydrogen blended pipelines is one of the main reasons that restrict its large-scale application. When high-concentration hydrogen comes into contact with high-strength natural gas pipeline materials, there are cracking and delayed fracture caused by material embrittlement. In addition, the explosion range caused by the leakage of natural gas mixed with hydrogen increases, and the combustion speed is faster. Natural gas blended with hydrogen pipelines have a higher risk of leakage caused by hydrogen embrittlement and more dangerous consequences of leakage accidents. Therefore, natural gas blended with hydrogen has extremely high requirements for gas uniformity.

[0004] At present, there are few related devices for large-diameter natural gas hydrogen blending mixers, and the cost of large-diameter hydrogen blending is high, and it is difficult to mix evenly. Therefore, it is of great significance to develop a mixing device suitable for large-diameter natural gas hydrogen blending.

[0005] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a variable diameter pipeline natural gas hydrogen blending mixer to overcome the defects of the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a variable diameter pipeline natural gas hydrogen blending mixer, which utilizes a tapered pipe section to increase the natural gas flow rate, utilizes a hole-type injection pipe section to achieve hydrogen jet acceleration, fully utilizes the kinetic energy of natural gas and hydrogen, and can better achieve rapid, uniform and efficient mixing of natural gas and hydrogen.

[0007] The objective of the present invention is achieved in this way. A variable diameter pipeline natural gas hydrogen blending mixer comprises a mixer main pipeline, the inlet end of the mixer main pipeline is sleeved with a tapered conical pipe section extending inward, the tapered conical pipe section is used to speed up the natural gas flowing through; the small diameter end of the tapered conical pipe section is connected to a hole-type injection pipe section with an injection hole arranged on the side wall, at least one hydrogen delivery inlet pipeline is sealed and penetrated through the side wall of the mixer main pipeline, the outlet of the hydrogen delivery inlet pipeline is connected to the injection hole of the hole-type injection pipe section, hydrogen enters the hole-type injection pipe section in the form of a cross-flow jet through the hydrogen delivery inlet pipeline and is mixed with the natural gas; a variable diameter static mixer is also arranged in the mixer main pipeline, the small diameter section of the variable diameter static mixer can be inserted in the hole-type injection pipe section, and the large diameter section of the variable diameter static mixer is arranged in the mixer main pipeline near the outlet end.

[0008] In a preferred embodiment of the present invention, the outlet of the hole-type injection pipe section is connected to a hydrogen-doping transition pipe section; the diameter of the small-diameter section of the variable-diameter static mixer is smaller than the diameter of the mixer main pipe, and the small-diameter section of the variable-diameter static mixer can be inserted into the hole-type injection pipe section and the hydrogen-doping transition pipe section to speed up the mixing of the gas in the mixer main pipe.

[0009] In a preferred embodiment of the present invention, two hydrogen delivery inlet pipes are radially symmetrically sealed and penetrated through the side wall of the mixer main pipe, and the diameter of the hydrogen delivery inlet pipes is smaller than the diameter of the small diameter section of the variable diameter static mixer.

[0010] In a preferred embodiment of the present invention, an annular gap is formed between the inner wall of the mixer main pipe and the outer walls of the tapered pipe section and the hydrogen-doping transition pipe section, and a pressure sensor and a temperature sensor are arranged in the annular gap.

[0011] In a preferred embodiment of the present invention, an observation window which can be opened or sealed closed is provided on the side wall of the main conduit of the mixer.

[0012] In a preferred embodiment of the present invention, a first flange is provided at the inlet end of the mixer main pipeline.

[0013] In a preferred embodiment of the present invention, a second flange is provided at the outlet end of the mixer main pipeline.

[0014] In a preferred embodiment of the present invention, a third flange is provided at the inlet of the hydrogen delivery inlet pipe.

[0015] In a preferred embodiment of the present invention, the hydrogen delivery inlet pipeline is provided with a flow control valve, a flow meter and a check valve.

[0016] In a preferred embodiment of the present invention, a component analyzer is provided at the outlet of the main pipeline of the mixer, and the component analyzer is electrically connected to the central processing platform.

[0017] As described above, the variable diameter pipeline natural gas hydrogen blending mixer of the present invention has the following beneficial effects:

[0018] The invention reduces the passage of natural gas transmission through the tapered conical pipe section at the inlet end, reduces the natural gas pressure, increases the natural gas flow rate, effectively utilizes the kinetic energy of the upstream natural gas, increases its gas velocity and enhances the mixing effect. The expanded diameter after the reduction changes the velocity and static pressure of the natural gas fluid, changes the flow state of the natural gas, increases the fluid turbulence intensity, enhances the fluid disturbance, and can promote the rapid mixing of natural gas and hydrogen.

[0019] Hydrogen is injected into the reduced pipe in the form of a jet through the injection holes. The injection holes are evenly distributed on the injection surface. The multi-hole injection form is adopted. Changing the hole diameter and the number of holes can change the flow rate of hydrogen injected into the hydrogen blending transition pipe section. Hydrogen is injected in the hole type. On the one hand, hydrogen is ejected in the form of multiple gas streams, which can increase the contact area between hydrogen and natural gas and make the mixing more uniform. On the other hand, the hole type injection can increase the flow rate of the injected hydrogen, improve the kinetic energy of the injected hydrogen, and increase the turbulence intensity. The hydrogen entering the jet forms a cross-flow mixture with the natural gas after the acceleration disturbance, and is initially mixed with the natural gas, which reduces the mixing cost of the static mixer;

[0020] The present invention can be effectively applied to hydrogen blending in natural gas main pipelines and skid-mounted natural gas hydrogen blending systems. It utilizes variable diameters to efficiently utilize the kinetic energy of pipeline natural gas, performs preliminary blending through natural gas disturbance and hydrogen jet, and achieves rapid mixing of natural gas and hydrogen. It has a simple structure and does not require external energy transmission. It improves the mixing uniformity of natural gas hydrogen blending while greatly reducing the mixing cost of natural gas hydrogen blending. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0022] in:

[0023] Figure 1 It is a schematic diagram of the variable diameter pipeline natural gas hydrogen blending mixer of the present invention.

[0024] Figure 2 It is a schematic diagram of the hole-type injection pipe section of the present invention.

[0025] Figure 3 This is a control principle diagram of the variable diameter pipeline natural gas hydrogen blending mixer of the present invention.

[0026] Figure 4 The figure is a flow chart of the hydrogen doping process of the present invention.

[0027] In the figure:

[0028] 1. Mixer main pipeline;

[0029] 2. Gradually tapered pipe section;

[0030] 3. Hole type injection pipe section; 31. Injection hole;

[0031] 4. Hydrogen delivery inlet pipeline;

[0032] 5. Variable diameter static mixer; 51. Small diameter section; 52. Large diameter section;

[0033] 6. Hydrogen doping transition pipe section;

[0034] 71, first flange; 72, second flange; 73, third flange;

[0035] 8. The original natural gas main pipeline;

[0036] 9. Flow control valve;

[0037] 10. Flow meter;

[0038] 11. Check valve;

[0039] 12. Component analyzer;

[0040] 13. Central processing platform;

[0041] 14. Pressure sensor;

[0042] 15. Temperature sensor. DETAILED DESCRIPTION

[0043] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0044] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0046] like Figure 1 , Figure 2 As shown, the present invention provides a variable diameter pipeline natural gas hydrogen blending mixer, comprising a mixer main pipeline 1, the inlet end of the mixer main pipeline 1 is sleeved with a tapered pipe section 2 extending inward; the tapered pipe section 2 is used to speed up the natural gas flowing through;

[0047] The small diameter end of the tapered pipe section 2 is connected to a hole-shaped injection pipe section 3 with an injection hole arranged on the side wall. At least one hydrogen delivery inlet pipe 4 is sealed and penetrated through the side wall of the mixer main pipe 1. The outlet of the hydrogen delivery inlet pipe 4 is connected to the injection hole 31 of the hole-shaped injection pipe section 3 (the injection holes 31 are regularly arranged on the side wall of the hole-shaped injection pipe section 3). Hydrogen enters the hole-shaped injection pipe section 3 in a cross-flow jet manner through the hydrogen delivery inlet pipe 4 and is mixed with natural gas.

[0048] A variable diameter static mixer 5 is also arranged in the mixer main pipeline 1. The small diameter section 51 of the variable diameter static mixer 5 can be inserted in the hole-shaped injection pipe section 3, and the large diameter section 52 of the variable diameter static mixer 5 is arranged in the mixer main pipeline 1 near the outlet end.

[0049] The mixer main pipeline 1 and its internal tapered conical pipe section 2 and hole-type injection pipe section 3 form a casing variable diameter structure. The natural gas transportation passage is gradually reduced through the tapered conical pipe section 2 and a variable diameter static mixer 5 is arranged. After mixing, the diameter is expanded again. The mixer main pipeline 1 is connected to the original natural gas main pipeline 8 to allow the natural gas to flow into the variable diameter pipeline natural gas hydrogen blending mixer.

[0050] The tapered conical pipe section 2 gradually reduces the natural gas transmission passage from a large diameter to a smaller diameter, gradually reducing the natural gas transmission flow area, thereby increasing the natural gas flow rate and changing the flow state, causing flow disturbance in the pipeline, which is helpful for mixing with hydrogen.

[0051] The outlet of the hydrogen delivery inlet pipe 4 is connected with the hole-shaped injection pipe section 3 in front of the tapered pipe section 2. The hydrogen enters the hole-shaped injection pipe section 3 through the hydrogen delivery inlet pipe 4 and the injection hole 31 of the hole-shaped injection pipe section 3, and is mixed with the accelerated natural gas. The hydrogen is injected into the reduced pipe in the form of a jet through the injection hole, which increases the fluid flow rate and the contact area with the natural gas. The accelerated natural gas and the jet-input hydrogen form a cross-flow mixture at the first mixing unit. In this way, it is preliminarily mixed with the natural gas, thereby reducing the mixing cost of the static mixer.

[0052] Hydrogen is injected from the front of the tapered pipeline through a small hole. After a certain distance of mixing, the pipeline is quickly reduced to the original pipeline diameter, and further mixed by the turbulence formed by the diameter reduction and the disturbance of the static mixer. That is, the two gases (hydrogen and natural gas) flow through the small diameter section 51 of the variable diameter static mixer 5, where they are mixed, and then the pipeline is expanded (the inner diameter of the mixer main pipeline 1 is larger than the hole-type injection pipeline section 3). The initially mixed hydrogen-blended natural gas forms a vortex and reflux due to the sudden expansion of the diameter, and continues to be more evenly mixed with the help of the large diameter section 52 of the variable diameter static mixer 5, and the mixed gas flows out to the downstream pipeline through the outlet end of the mixer main pipeline 1.

[0053] The present invention reduces the passage of natural gas transportation through the tapered conical pipe section at the inlet end, increases the natural gas flow rate, effectively utilizes the kinetic energy of the upstream natural gas, increases its gas velocity and enhances the mixing effect. The expanded diameter after the reduction changes the velocity and static pressure of the natural gas fluid, changes the flow state of the natural gas, causes turbulence, and greatly improves the uniformity of the natural gas hydrogen blending.

[0054] Hydrogen is injected into the reduced pipe in the form of a jet through the injection hole. The injection of hydrogen in the hole shape can increase the contact area between hydrogen and natural gas, making the mixing more uniform. On the other hand, the hole injection can increase the flow rate of the injected hydrogen and improve the kinetic energy of the injected hydrogen. The hydrogen entering the jet forms a cross-flow mixture with the natural gas after the acceleration disturbance, and is initially mixed with the natural gas, reducing the mixing cost of the static mixer.

[0055] The present invention can be effectively applied to hydrogen blending in natural gas main pipelines and skid-mounted natural gas hydrogen blending systems. It utilizes variable diameters to efficiently utilize the kinetic energy of pipeline natural gas and achieve rapid mixing of natural gas and hydrogen. It has a simple structure and does not require external energy transmission. It improves the mixing uniformity of natural gas hydrogen blending while greatly reducing the mixing cost of natural gas hydrogen blending.

[0056] Furthermore, the tapered conical pipe section 2 should have a certain length, and the contraction angle should be between 25° and 30°, so that the diameter of the pipeline can change as slowly as possible to reduce the impact on the pipeline and reduce pressure loss. The diameter of the pipeline after tapering should not be too small. The contraction ratio, that is, the ratio of the diameter of the hydrogen blending transition pipe section to the diameter of the main mixed gas pipeline, can be between 0.65 and 0.75 to avoid excessive flow rate of combustible gases such as natural gas and hydrogen.

[0057] Further, if Figure 1 As shown, the outlet of the hole-type injection pipe section 3 is connected to the hydrogen-doped transition pipe section 6; the small-diameter section 51 of the variable-diameter static mixer (the large-diameter section 52 and the small-diameter section 51 are both hollow equal-diameter pipe sections, and the inner diameter of the small-diameter section 51 is smaller than the inner diameter of the large-diameter section 52) is a mixing unit, which plays a turbulent role, so that hydrogen and natural gas are quickly mixed. The diameter size (inner diameter size) of the small-diameter section 51 of the variable-diameter static mixer is smaller than the diameter size of the mixer main pipeline 1, and the small-diameter section 51 of the variable-diameter static mixer can be inserted into the hole-type injection pipe section 3 and the hydrogen-doped transition pipe section 6. The hydrogen-doped transition pipe section 6 cooperates with the hole-type injection pipe section 3 to meet the path length requirements for the initial mixing of natural gas and hydrogen. The small-diameter section 51 of the variable-diameter static mixer is inserted into the hole-type injection pipe section 3 and the hydrogen-doped transition pipe section 6 to fully mix the natural gas and hydrogen.

[0058] In a specific embodiment of the present invention, two hydrogen delivery inlet pipes 4 are radially symmetrically sealed and penetrated on the side wall of the mixer main pipe 1. The diameter of the hydrogen delivery inlet pipe 4 is smaller than the diameter of the small diameter section 51 of the variable diameter static mixer. The symmetrical arrangement of the hydrogen injection pipes can fully and efficiently utilize the mixing area of ​​the static mixer in the pipe and give full play to its mixing capacity. Secondly, it can also be increased or decreased according to the needs of the working conditions, such as 4, 6, or 8 hydrogen delivery inlet pipes 4, but at the beginning of the design, it should be considered that under all working conditions and the number of hydrogen pipes, hydrogen and natural gas should be mixed evenly in accordance with the standards.

[0059] Further, if Figure 1As shown, the mixer main pipeline 1 and the tapered conical pipe section 2, the hole-shaped injection pipe section 3, and the hydrogen-doping transition pipe section 6 inside it form a sleeve-type variable diameter structure. An annular gap is formed between the inner wall of the mixer main pipeline 1 and the outer wall of the tapered conical pipe section 2 and the hydrogen-doping transition pipe section 6. A pressure sensor 14 (monitoring the pressure in the hole-shaped injection pipe section 3 and the hydrogen-doping transition pipe section 6 to avoid pipeline blockage) and a temperature sensor 15 (monitoring the temperature in the hole-shaped injection pipe section 3 and the hydrogen-doping transition pipe section 6 to monitor the flow condition and timely discover and avoid the throttling effect caused by flow fluctuation or unreasonable pipe diameter setting). The sleeve-type structure can better arrange sensors and wire the sensors. Figure 3 , increase structural strength, and also achieve the effect of dust and corrosion prevention.

[0060] An operation window may be provided on the side wall of the mixer main pipe 1 to facilitate maintenance of the sensor.

[0061] Further, if Figure 1 As shown, a first flange 71 is provided at the inlet end of the mixer main pipeline 1 .

[0062] Further, if Figure 1 As shown, a second flange 72 is provided at the outlet end of the mixer main pipe 1 .

[0063] The mixer main pipeline 1 is detachably connected to the original natural gas main pipeline through the first flange 71 and the second flange 72, which is convenient for disassembly, maintenance and parts replacement. The entire device can be disassembled for maintenance and cleaning.

[0064] Further, if Figure 1 As shown, a third flange 73 is provided at the inlet of the hydrogen delivery inlet pipe 4, and the hydrogen delivery inlet pipe 4 is detachably connected to the hydrogen supply device (existing technology) through the third flange 73, so as to facilitate disassembly, maintenance and parts replacement.

[0065] further, Figure 1 The variable diameter static mixer shown is a blade device. The application example is the SK type hydrogen blending mixing device. The SK type mixing unit is made of spiral blades twisted 180 degrees to the left and right and welded at 90 degrees. Natural gas and hydrogen flow through the mixer to change the flow rate and flow direction for mixing. The variable diameter static mixer can also be other required static mixers, which can be changed according to the specific requirements of the blending.

[0066] The variable diameter static mixer 5 can be selected into the best type suitable for the pipe diameter and working conditions. The number of variable diameter static mixers and related structural parameters are determined by the required mixing uniformity, working conditions and energy loss allowance.

[0067] Further, if Figure 3As shown, the present invention sets a flow control valve 9 on the hydrogen delivery inlet pipeline 4 to control the hydrogen flow; and sets a flow meter 10 to monitor the hydrogen flow. Generally, the pressure of the injected hydrogen is required to be slightly higher than the pressure of the natural gas in the main pipeline. To ensure that the hydrogen does not flow back, a check valve 11 is set after the flow meter 10.

[0068] Further, if Figure 3 As shown, the present invention sets a component analyzer 12 at the outlet of the mixer main pipeline, and the component analyzer 12 is connected to the CPU central processing platform 13 to further analyze the mixed gas composition at the pipeline output end, timely monitor the changes of the external transmission components, and through the CPU central processing platform, if the proportion of hydrogen is high, the hydrogen flow rate is reduced to perform feedback control. The feedback control process is as follows Figure 4 As shown, to ensure the stability of the exported components.

[0069] The present invention provides a variable diameter pipeline natural gas hydrogen blending mixer, the working principle of which is:

[0070] The natural gas is input from the upstream pipeline into the tapered conical pipe section 2 at the inlet end of the mixer main pipe 1. The tapered conical pipe section 2 gradually reduces the natural gas transmission passage from a large pipe diameter to a smaller pipe diameter, gradually reducing the natural gas transmission flow area, and the natural gas flow rate gradually increases. The flow state changes and flows to the hole-type injection pipe section 3; hydrogen is injected into the reduced hole-type injection pipe section 3 in the form of a jet through the injection hole 31. The hydrogen gas entering the jet has a high flow rate and an increased contact area with the natural gas. In the hole-type injection pipe section 3, it forms a cross-flow mixture with the natural gas after the acceleration disturbance. The two gases (hydrogen and natural gas) flow through the variable diameter static mixer. The natural gas and hydrogen pass through the small diameter section 51 of the mixer 5 and are mixed therein. As the gas velocity of the natural gas increases, its turbulence intensity is greater when passing through the static mixer, and a better mixing effect is achieved. After a certain distance of mixing, the pipe diameter suddenly expands to the size of the original pipe (mixer main pipe 1). At this time, the natural gas and hydrogen will form reflux and certain vortices due to the expansion of the diameter, and further mix. A static mixer (large diameter section 52 of the variable diameter static mixer 5) is also provided here to assist in mixing, and finally a highly uniform natural gas-hydrogen mixing is achieved, and the mixed gas flows out to the downstream pipe through the outlet end of the mixer main pipe 1.

[0071] As described above, the variable diameter pipeline natural gas hydrogen blending mixer of the present invention has the following beneficial effects:

[0072] The invention reduces the passage of natural gas transmission through the tapered conical pipe section at the inlet end, reduces the natural gas pressure, increases the natural gas flow rate, effectively utilizes the kinetic energy of the upstream natural gas, increases its gas velocity and enhances the mixing effect. The expanded diameter after the reduction changes the velocity and static pressure of the natural gas fluid, changes the flow state of the natural gas, increases the fluid turbulence intensity, enhances the fluid disturbance, and can promote the rapid mixing of natural gas and hydrogen.

[0073] Hydrogen is injected into the reduced pipe in the form of a jet through the injection holes. The injection holes are evenly distributed on the injection surface. The multi-hole injection form is adopted. Changing the hole diameter and the number of holes can change the flow rate of hydrogen injected into the hydrogen blending transition pipe section. Hydrogen is injected in the hole type. On the one hand, hydrogen is ejected in the form of multiple gas streams, which can increase the contact area between hydrogen and natural gas and make the mixing more uniform. On the other hand, the hole type injection can increase the flow rate of the injected hydrogen, improve the kinetic energy of the injected hydrogen, and increase the turbulence intensity. The hydrogen entering the jet forms a cross-flow mixture with the natural gas after the acceleration disturbance, and is initially mixed with the natural gas, which reduces the mixing cost of the static mixer;

[0074] The present invention can be effectively applied to hydrogen blending in natural gas main pipelines and skid-mounted natural gas hydrogen blending systems. It utilizes variable diameters to efficiently utilize the kinetic energy of pipeline natural gas, performs preliminary blending through natural gas disturbance and hydrogen jet, and achieves rapid mixing of natural gas and hydrogen. It has a simple structure and does not require external energy transmission. It improves the mixing uniformity of natural gas hydrogen blending while greatly reducing the mixing cost of natural gas hydrogen blending.

[0075] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A variable diameter pipeline natural gas hydrogen blending mixer, characterized in that: It comprises a mixer main pipeline, the inlet end of which is sleeved with a tapered conical pipe section extending inward, and the tapered conical pipe section is used to speed up the natural gas flowing through; the small-diameter end of the tapered conical pipe section is connected to a hole-type injection pipe section with an injection hole arranged on the side wall, and at least one hydrogen delivery inlet pipeline is sealed and penetrated through the side wall of the mixer main pipeline, and the outlet of the hydrogen delivery inlet pipeline is connected to the injection hole of the hole-type injection pipe section, and hydrogen enters the hole-type injection pipe section in the form of a cross-flow jet through the hydrogen delivery inlet pipeline to be mixed with the natural gas; a variable-diameter static mixer is also arranged in the mixer main pipeline, and the small-diameter section of the variable-diameter static mixer can be inserted in the hole-type injection pipe section, and the large-diameter section of the variable-diameter static mixer is arranged in the mixer main pipeline near the outlet end.

2. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: The outlet of the hole-type injection pipe section is connected to a hydrogen-doping transition pipe section; the diameter of the small-diameter section of the variable-diameter static mixer is smaller than the diameter of the mixer main pipe, and the small-diameter section of the variable-diameter static mixer can be inserted into the hole-type injection pipe section and the hydrogen-doping transition pipe section to speed up the mixing of the gas in the mixer main pipe.

3. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: Two hydrogen delivery inlet pipes are radially symmetrically and sealedly penetrated through the side wall of the main pipe of the mixer, and the diameter of the hydrogen delivery inlet pipes is smaller than the diameter of the small diameter section of the variable diameter static mixer.

4. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 2, characterized in that: An annular gap is formed between the inner wall of the mixer main pipe and the outer walls of the tapered conical pipe section and the hydrogen-doping transition pipe section, and a pressure sensor and a temperature sensor are arranged in the annular gap.

5. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 4, characterized in that: An observation window which can be opened or sealed is arranged on the side wall of the main pipeline of the mixer.

6. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: A first flange is arranged at the inlet end of the mixer main pipeline.

7. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: A second flange is arranged at the outlet end of the mixer main pipeline.

8. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: A third flange is arranged at the inlet of the hydrogen delivery inlet pipeline.

9. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: The hydrogen delivery inlet pipeline is provided with a flow control valve, a flow meter and a check valve.

10. The variable diameter pipeline natural gas hydrogen blending mixer according to claim 1, characterized in that: A component analyzer is arranged at the outlet of the main pipeline of the mixer, and the component analyzer is electrically connected to the central processing platform.

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