Natural gas hydrogen-doped operation device

Abstract

The invention relates to the technical field of glass production and manufacturing, and discloses a natural gas hydrogen-doped operation device which is applied to conveying mixed gas to a glass melting furnace and comprises a mixing pipe, the mixing pipe is used for mixing natural gas and hydrogen, and a first gas inlet and a gas outlet are formed in the two ends of the mixing pipe in the first direction respectively. A second air inlet is formed in the middle of the mixing pipe, and the arrangement direction of the second air inlet is inclined relative to the first direction; the first gas inlet communicates with a natural gas source through a first pipeline; the second gas inlet is communicated with a hydrogen source through a second pipeline, and a backflow plate is arranged at the communication position of the second gas inlet and the mixing pipe; the gas outlet is communicated with a third pipeline, and one end, deviating from the gas outlet, of the third pipeline is used for conveying mixed gas formed by uniformly mixing the natural gas and the hydrogen to a combustion gun of the glass melting furnace, so that the natural gas and the hydrogen can be promoted to be mixed more uniformly, and the uniformity of the mixed gas conveyed to the glass melting furnace is ensured; and ideal energy-saving and carbon-reducing effects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of glass production and manufacturing, and in particular to a natural gas hydrogen-blended operation device. Background Art

[0002] As an important basic material, glass consumes a huge amount of energy in the glass manufacturing process. Especially in the key link of glass melting furnace, energy consumption reaches its peak. At present, natural gas is one of the main energy sources of glass melting furnace, which has the advantages of high calorific value and stable combustion. However, natural gas will emit carbon dioxide, sulfur dioxide, nitrogen oxides and other greenhouse gases during the combustion process. The CO2 emitted by the glass melting furnace accounts for about 65% of the total CO2 emissions in the glass manufacturing process.

[0003] Hydrogen is a clean energy source with abundant resources and a very high calorific value. Its combustion product is water. In order to reduce the amount of CO2 emitted by the combustion of natural gas in a glass melting furnace, some existing manufacturers mix hydrogen into natural gas to form a mixed fuel gas, which is then transported to the glass melting furnace for combustion. Mixing hydrogen into natural gas can promote the combustion of natural gas, improve combustion efficiency, reduce CO2 emissions, improve environmental quality, and ensure the stability of the glass melting furnace temperature and a relative reduction in energy consumption.

[0004] However, the current blending devices used to blend natural gas and hydrogen do not have a good mixing effect on natural gas and hydrogen, resulting in uneven mixing of natural gas and hydrogen, and stratification during combustion, which makes it impossible to achieve the ideal combustion effect and the expected energy-saving and carbon-reduction effects. Summary of the invention

[0005] In view of this, the present invention provides a natural gas hydrogen blending operation device to solve the problem that the blending device has a poor mixing effect on natural gas and hydrogen, resulting in failure to achieve an ideal combustion effect and unable to achieve the expected energy-saving and carbon-reduction effects.

[0006] The present invention provides a natural gas hydrogen blending operation device, which is used to transport mixed fuel gas to a glass melting furnace. The natural gas hydrogen blending operation device comprises:

[0007] A mixing tube, used for mixing natural gas and hydrogen, wherein the mixing tube is provided with a first air inlet and an air outlet at both ends along a first direction, and a second air inlet is provided in the middle of the mixing tube, and the arrangement direction of the second air inlet is inclined relative to the first direction;

[0008] A natural gas source connected to the first gas inlet through a first pipeline;

[0009] A hydrogen gas source connected to the second gas inlet through a second pipeline;

[0010] a return plate, disposed at the connection between the second air inlet and the mixing tube, and used to guide the hydrogen gas input through the second air inlet to flow toward the direction close to the air outlet;

[0011] The third pipe has one end connected to the gas outlet and the other end used to connect to the glass melting furnace.

[0012] A natural gas hydrogen blending operation device according to the present invention has at least the following beneficial effects:

[0013] By tilting the second air inlet relative to the mixing tube, an angle is formed between the flow direction of the hydrogen input into the mixing tube from the second air inlet and the flow direction of the natural gas input into the mixing tube from the first air inlet, and the angle is an acute angle. The flow direction of the hydrogen is changed by the guidance of the reflux plate, and the collision and diffusion between the natural gas and hydrogen gas molecules are increased, thereby promoting a more uniform mixing of the two gases, ensuring the uniformity of the mixed fuel gas transported from the third pipeline to the glass melting furnace, and achieving an ideal energy-saving and carbon-reduction effect in the combustion process.

[0014] In an optional embodiment, the bottom of the return plate is tightly connected to one end of the second air inlet toward the mixing tube, and is tightly fitted with the inner wall of the mixing tube in the height direction; the return plate is arranged in an arc shape, and the top of the return plate is spaced apart from the inner top of the mixing tube.

[0015] In an optional embodiment, the second air inlet is arranged along a first direction from the third pipe toward the first pipe, and the second air inlet is arranged to be inclined upward.

[0016] In an optional embodiment, the inclination angle of the second air inlet is set to 45° to 60°.

[0017] In an optional embodiment, one end of the second air inlet facing the mixing tube is configured as a first part, and the other end is configured as a second part, and a diameter of the first part is smaller than a diameter of the second part.

[0018] In an optional embodiment, the second air inlet further includes a tapered portion, a small diameter end of the tapered portion is connected to the first portion, and a large diameter end of the tapered portion is connected to the second portion.

[0019] In an optional embodiment, the second air inlet extends into the mixing tube at one end away from the second pipe and is connected to the return plate.

[0020] In an optional embodiment, a first ball valve and a first check valve are sequentially arranged on the first pipeline along the conveying direction of the natural gas.

[0021] In an optional embodiment, a second ball valve and a second check valve are sequentially arranged on the second pipeline along the conveying direction of hydrogen.

[0022] In an optional implementation, a third ball valve and a third check valve are sequentially arranged on the third pipeline along the conveying direction of the mixed gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a schematic structural diagram of a natural gas hydrogen blending operation device according to an embodiment of the present invention applied to a glass melting furnace;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the mixing tube;

[0026] Figure 3 for Figure 2 Schematic diagram of the structure of the middle return plate.

[0027] Description of reference numerals:

[0028] 100-Glass melting furnace;

[0029] 200-mixing tube, 210-first air inlet, 211-first flange, 220-air outlet, 221-third flange, 230-second air inlet, 231-second flange, 232-first part, 233-second part, 234-conical part, 240-return plate, 241-arc-shaped part, 242-straight part;

[0030] 300 - natural gas source, 310 - first pipeline, 320 - first ball valve, 330 - first check valve;

[0031] 400 - hydrogen gas source, 410 - second pipeline, 420 - second ball valve, 430 - second check valve;

[0032] 500 - the third pipeline, 510 - the third ball valve, 520 - the third check valve. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] In the description of this embodiment, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying 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 this embodiment. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of this embodiment, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0036] Hydrogen is a clean energy source with an extremely high calorific value. Its combustion product is water. The flame propagation speed of hydrogen is relatively fast, and the energy required for combustion is low. After mixing with natural gas, it can improve the stability of the flame and the combustion efficiency, which helps to improve the combustion efficiency of natural gas. In order to reduce the amount of CO2 emitted by the combustion of natural gas in a glass melting furnace, a mixing device is used in the related art to mix natural gas and hydrogen to obtain a mixed fuel gas, which is then transported to the glass melting furnace for combustion. This can not only improve the combustion efficiency of natural gas, reduce the emission of CO2, and improve the quality of the environment, but also ensure the stability of the temperature of the glass melting furnace and the relative reduction of energy consumption. However, the mixing device in the related art has a poor mixing effect on natural gas and hydrogen, which makes the mixing of natural gas and hydrogen uneven, and the combustion produces stratification, resulting in the inability to achieve the ideal combustion effect and the expected energy saving and carbon reduction effect. In order to solve the above technical defects, a natural gas hydrogen blending operation device according to an embodiment of the present invention is provided.

[0037] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0038] According to an embodiment of the present invention, a natural gas hydrogen blending operation device is provided, which is used to deliver mixed fuel gas to a glass melting furnace 100. The natural gas hydrogen blending operation device includes a mixing tube 200, and the mixing tube 200 is used to mix natural gas and hydrogen. The mixing tube 200 is provided with a first air inlet 210 and an air outlet 220 at both ends along a first direction, and a second air inlet 230 is provided in the middle of the mixing tube 200. The arrangement direction of the second air inlet 230 is inclined relative to the first direction; the first air inlet 210 is connected to a first pipe 310 through a first pipe 310. The second air inlet 230 is connected to the hydrogen source 400 through the second pipe 410; the connection between the second air inlet 230 and the mixing tube 200 is provided with a return plate 240, and the return plate 240 is used to guide the hydrogen input through the second air inlet 230 to flow toward the direction close to the air outlet 220; the air outlet 220 is connected to a third pipe 500, and the end of the third pipe 500 away from the air outlet 220 is used to transport the mixed fuel gas formed by the uniform mixing of natural gas and hydrogen to the combustion gun of the glass melting furnace 100. It can be understood that the first direction and the height direction mentioned in the text refer to Figure 2 The first direction and the height direction.

[0039] The natural gas hydrogen blending operation device of this embodiment is arranged by tilting the second air inlet 230 relative to the mixing tube 200, so that an angle is formed between the flow direction of the hydrogen input into the mixing tube 200 from the second air inlet 230 and the flow direction of the natural gas input into the mixing tube 200 from the first air inlet 210, and the angle is an acute angle, which helps the hydrogen to flow more smoothly in the mixing tube 200, reduces the flow resistance of hydrogen, and improves the mixing efficiency of natural gas and hydrogen; the flow direction of hydrogen is changed by the guidance of the reflux plate 240, and the collision and diffusion between the natural gas and hydrogen gas molecules are increased, thereby promoting a more uniform mixing of the two gases, providing a more stable and efficient mixed fuel gas for the later combustion; and the mixed fuel gas is transported to the glass melting furnace 100 through the third pipeline 500 to ensure the uniformity of the mixed fuel gas, achieve the ideal combustion effect, and realize the expected energy saving and carbon reduction effect.

[0040] It should be noted that, because the natural gas and hydrogen are evenly mixed in the mixing tube 200 due to the guiding effect of the return plate 240 and the negative pressure generated at a specific position of the return plate 240, and the gas outlet 220 is directly connected to the combustion gun of the glass melting furnace 100 through the third pipeline 500, the mixed fuel gas obtained after mixing can be directly transported to the combustion gun of the glass melting furnace 100 for combustion, thereby improving the safety of the mixed fuel gas.

[0041] It can be understood that in this embodiment, hydrogen is introduced into the mixing tube 200 as a low-pressure gas, and natural gas is introduced into the mixing tube 200 as a high-pressure gas. The negative pressure effect generated at a specific position of the return plate 240 is conducive to better mixing and integration of hydrogen into the natural gas, without the need for any mechanical device that requires a motor to drive and rotate; the structure is simple, the manufacturing cost is low, and the stability and reliability of the device are improved.

[0042] Specifically, one end of the second air inlet 230 facing the mixing tube 200 is set as a first part 232, and the other end is set as a second part 233, and the diameter of the first part 232 is smaller than the diameter of the second part 233. Because the diameter size of the connection between the first part 232 and the second part 233 changes, the hydrogen forms an acceleration area in the first part 232, which increases the flow rate of the hydrogen, helps the hydrogen to be integrated into the natural gas faster, and improves the mixing efficiency of the natural gas and hydrogen.

[0043] Specifically, the second air inlet 230 further includes a tapered portion 234, the small diameter end of the tapered portion 234 is in communication with the first portion 232, and the large diameter end of the tapered portion 234 is in communication with the second portion 233. The transition of the tapered portion 234 is conducive to reducing the flow pressure loss of hydrogen at the diameter change point in the second air inlet 230.

[0044] Specifically, the second air inlet 230 is arranged along the first direction from the third pipe 500 toward the first pipe 310, and the second air inlet 230 is inclined upward. In this way, the flow direction of the hydrogen gas input into the mixing tube 200 from the second air inlet 230 is decomposed in the first direction and the flow direction of the natural gas input into the mixing tube 200 from the first air inlet 210 is opposite, and the flow direction of the hydrogen gas is changed by the guidance of the return plate 240, and the collision and diffusion between the natural gas and hydrogen gas molecules are further increased, so as to promote a more uniform mixing of the two gases, ensure the uniformity of the mixed fuel gas transported from the third pipe 500 to the glass melting furnace 100, and achieve the ideal energy-saving and carbon-reducing effect in the combustion process. It can be understood that the upward inclination described in the text is based on Figure 2 is expressed from the perspective of.

[0045] Specifically, the inclination angle of the second air inlet 230 is set to 54°. After experimental verification, the hydrogen entering the mixing tube 200 at a flow direction of 54° with the first direction can achieve a better uniform mixing effect with the natural gas entering the mixing tube 200 in parallel with the first direction after the flow direction is changed by the guidance of the return plate 240. In specific applications, the inclination angle of the second air inlet 230 can be reasonably increased or decreased according to the actual arrangement of the second pipeline 410. For example, in other embodiments, the inclination angle of the second air inlet 230 is set to 45°, 50°, 60° or other angles.

[0046] Specifically, the return plate 240 is made of stainless steel with excellent corrosion resistance, which can effectively enhance the corrosion resistance of the return plate 240 to natural gas and hydrogen, extend the service life of the entire device, and ensure the long-term operation of the device.

[0047] like Figure 3 As shown, specifically, the height of the reflux plate 240 is 35mm-50mm, the thickness is 5mm-10mm, the bottom is set as an arc-shaped portion 241, and the radius is 40mm-60mm. This design can guide the flow direction of hydrogen in the mixing tube 200, so that the natural gas and hydrogen can be more fully contacted and mixed.

[0048] Specifically, the bottom of the return plate 240 is closely connected to one end of the second air inlet 230 facing the mixing tube 200, and is closely attached to the inner wall of the mixing tube 200 in the height direction; the return plate 240 is arranged in an arc shape, and the top of the return plate 240 is arranged at a distance from the inner top of the mixing tube 200. This arrangement can better guide and change the flow direction of hydrogen, and on the other hand, enhance the negative pressure effect generated at the return plate 240, which is more conducive to the mixing and integration of hydrogen into natural gas.

[0049] Specifically, the top of the return plate 240 is a straight portion 242, which can effectively guide the airflow and is conducive to the uniform distribution of natural gas and hydrogen in the mixing area.

[0050] Specifically, the bending radius of the return plate 240 is 60 mm-80 mm, which is beneficial to reducing the pressure loss and speed change of the flow of hydrogen at the bend.

[0051] Specifically, the surface of the return plate 240 is in a smooth state to avoid causing resistance to the natural gas and hydrogen gas during flow.

[0052] The above-mentioned design of the reflux plate 240 is conducive to the uniform mixing of natural gas and hydrogen, and ensures the normal operation of the natural gas hydrogen blending device of this embodiment.

[0053] In some embodiments, the second air inlet 230 extends into the mixing tube 200 at one end away from the second pipeline 410 and is connected to the return plate 240. This arrangement ensures that the hydrogen delivered through the second air inlet 230 enters the mixing tube 200 and then changes its flow direction through the return plate 240; the return plate 240 can prevent the natural gas and hydrogen entering the mixing tube 200 from counter-flowing into the second air inlet 230, ensuring that the hydrogen is unidirectionally delivered to the mixing tube 200 through the second air inlet 230, increasing the collision and diffusion between the natural gas and hydrogen gas molecules, thereby promoting the uniform mixing of the two gases.

[0054] like Figure 1 As shown, in some embodiments, the first ball valve 320 and the first check valve 330 are sequentially arranged on the first pipeline 310 along the conveying direction of the natural gas. On the one hand, the opening of the first ball valve 320 is controlled to control the on-off of the first pipeline 310, thereby controlling the fluidity of the natural gas; when in the open state, the natural gas can smoothly pass through the first pipeline 310 into the mixing tube 200 to mix with hydrogen and then be transported to the combustion gun of the glass melting furnace 100 for combustion; when in the closed state, the flow of the natural gas can be quickly cut off to prevent natural gas leakage. On the other hand, the first check valve 330 can prevent the natural gas from flowing back or back from the mixing tube 200 through the first pipeline 310 to the natural gas source 300, ensuring that the natural gas can only flow in one direction in the first pipeline 310, ensuring the safety and stability of the operation of the natural gas hydrogen blending operation device of this embodiment.

[0055] Specifically, the second pipeline 410 is provided with a second ball valve 420 and a second check valve 430 in sequence along the hydrogen delivery direction. On the one hand, the opening of the second ball valve 420 is controlled to control the on-off of the second pipeline 410, thereby controlling the fluidity of hydrogen; when in the open state, hydrogen can smoothly pass through the second pipeline 410 into the mixing tube 200 to be mixed with natural gas and then transported to the combustion gun of the glass melting furnace 100 for combustion; when in the closed state, the flow of hydrogen can be quickly cut off to prevent hydrogen leakage. On the other hand, the second check valve 430 can prevent hydrogen from flowing back or back from the mixing tube 200 through the second pipeline 410 back to the hydrogen source 400, ensuring that hydrogen can only flow in one direction in the second pipeline 410, ensuring the safety and stability of the operation of the natural gas hydrogen blending operation device of this embodiment.

[0056] Specifically, the third ball valve 510 and the third check valve 520 are sequentially arranged on the third pipeline 500 along the conveying direction of the mixed gas. On the one hand, the opening of the third ball valve 510 is controlled to control the on-off of the third pipeline 500, thereby controlling the fluidity of the mixed gas; when in the open state, the mixed gas can be smoothly conveyed to the combustion gun of the glass melting furnace 100 through the third pipeline 500 for combustion; when in the closed state, the flow of the mixed gas can be quickly cut off to prevent the leakage of the mixed gas. On the other hand, the third check valve 520 can prevent the mixed gas from flowing back or back from the combustion gun of the glass melting furnace 100 through the third pipeline 500 back to the mixing tube 200, ensuring that the mixed gas can only flow in one direction in the third pipeline 500, ensuring the safety and stability of the operation of the natural gas hydrogen blending operation device of this embodiment.

[0057] Specifically, the mixing tube 200 is configured as a seamless steel tube, which has good hydrogen corrosion resistance, ensuring long-term use of the device of this embodiment. The inner walls of all seamless steel tubes are in a smooth state, which can reduce the friction resistance of natural gas and hydrogen when flowing, and ensure smooth flow of gas in the mixing tube 200.

[0058] Specifically, the first flange 211 adopts a D50 plate flange, and the diameter of the first air inlet 210 is 55mm-80mm; the third flange 221 adopts a D50 plate flange, and the diameter of the air outlet 220 is 55mm-80mm; the second flange 231 adopts a DN65 plate flange, the diameter of the second part of the second air inlet 230 is 50mm-75mm, and the diameter of the first part of the second air inlet is 40mm-65mm; the first air inlet 210, the second air inlet 230 and the air outlet 220 all adopt Seamless steel pipe; the length of the mixing tube 200 located at the first air inlet 210 and the air outlet 220 along the first direction is 400mm-480mm; the distance between the connection point of the second air inlet 230 and the mixing tube 200 and the first air inlet 210 along the first direction is 116mm-156mm.

[0059] The specific operating principle of the natural gas hydrogen blending operation device of this embodiment is as follows:

[0060] Adjust the first ball valve 320 of natural gas to 50%-80% opening to ensure that the natural gas flows at 268Nm 3 / h-430Nm 3 / h flow smoothly through the first pipeline 310 into the mixing tube 200; at the same time, the second ball valve 420 is adjusted to an opening of 30%-70% to ensure that the hydrogen 30Nm 3 / h-65Nm 3 / h flows smoothly through the second pipe 410 into the mixing tube 200; the flow direction of hydrogen changes, and the airflow is disturbed to a certain extent; at this time, inside the mixing tube 200, due to the effect of the return plate 240 and the large bending radius of the return plate 240, the flow pressure loss and speed change of hydrogen at the bend are reduced. Inside the mixing tube 200, the mass of hydrogen is relatively light and floats upward, while the mass of natural gas is relatively large and floats downward, increasing the collision between the two gas molecules, the effect of the return plate 240, and the negative pressure generated at the return plate 240, so that the two gases are evenly mixed, and the flow rate of the mixed gas is 298Nm 3 / h-495Nm 3 / h, and flows into the glass furnace through the third pipeline 500 for combustion.

[0061] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the present invention.

Claims

1. A natural gas hydrogen blending operation device, used for delivering mixed fuel gas to a glass melting furnace (100), characterized in that: The natural gas hydrogen blending operation device comprises: A mixing tube (200) for mixing natural gas and hydrogen, wherein the mixing tube (200) is provided with a first air inlet (210) and an air outlet (220) at two ends along a first direction, and a second air inlet (230) is provided in the middle of the mixing tube (200), wherein the arrangement direction of the second air inlet (230) is inclined relative to the first direction; A natural gas source (300) is connected to the first gas inlet (210) via a first pipeline (310); A hydrogen gas source (400) is connected to the second gas inlet (230) via a second pipeline (410); a return plate (240), disposed at a connection point between the second air inlet (230) and the mixing tube (200), and used for guiding the hydrogen gas input through the second air inlet (230) to flow in a direction close to the air outlet (220); The third pipe (500) has one end connected to the gas outlet (220) and the other end used to connect to the glass melting furnace (100).

2. A natural gas hydrogen blending operation device according to claim 1, characterized in that: The bottom of the return plate (240) is closely connected to one end of the second air inlet (230) facing the mixing tube (200), and is closely fitted with the inner wall of the mixing tube (200) in the height direction; the return plate (240) is arranged in an arc shape, and the top of the return plate (240) is spaced apart from the inner top of the mixing tube (200).

3. A natural gas hydrogen blending operation device according to claim 1, characterized in that: The second air inlet (230) is arranged along a first direction from the third duct (500) toward the first duct (310), and the second air inlet (230) is arranged to be inclined upward.

4. A natural gas hydrogen blending operation device according to claim 3, characterized in that: The inclination angle of the second air inlet (230) is set to 45° to 60°.

5. A natural gas hydrogen blending operation device according to claim 3 or 4, characterized in that: One end of the second air inlet (230) facing the mixing tube (200) is configured as a first portion (232), and the other end is configured as a second portion (233); the diameter of the first portion (232) is smaller than the diameter of the second portion (233).

6. A natural gas hydrogen blending operation device according to claim 5, characterized in that: The second air inlet (230) further comprises a tapered portion (234), the small diameter end of the tapered portion (234) being in communication with the first portion (232), and the large diameter end of the tapered portion (234) being in communication with the second portion (233).

7. A natural gas hydrogen blending operation device according to any one of claims 1 to 4, characterized in that: One end of the second air inlet (230) facing away from the second pipe (410) extends into the mixing tube (200) and is connected to the return plate (240).

8. A natural gas hydrogen blending operation device according to any one of claims 1 to 4, characterized in that: A first ball valve (320) and a first check valve (330) are sequentially arranged on the first pipeline (310) along the conveying direction of the natural gas.

9. A natural gas hydrogen blending operation device according to any one of claims 1 to 4, characterized in that: A second ball valve (420) and a second check valve (430) are sequentially arranged on the second pipeline (410) along the transport direction of hydrogen.

10. A natural gas hydrogen blending operation device according to any one of claims 1 to 4, characterized in that: A third ball valve (510) and a third check valve (520) are sequentially arranged on the third pipeline (500) along the conveying direction of the mixed gas.

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