Distributed natural gas mixed hydrogen transmission and distribution device

Abstract

The utility model relates to a distributed natural gas mixed hydrogen transmission and distribution device which comprises a hydrogen mixing pipe and a mixing tank which are communicated, a hydrogen transmission pipe is fixedly arranged on the hydrogen mixing pipe in a penetrating mode, the hydrogen transmission pipe comprises a radial pipe and an axial pipe, and the axial pipe extends in the direction opposite to the natural gas inlet direction and is parallel to the axial direction of the hydrogen mixing pipe. The radial pipe penetrates through the hydrogen mixing pipe and coincides with the radial direction of the hydrogen mixing pipe, and a hydrogen outlet of the hydrogen conveying pipe is formed in the side wall of the axial pipe; the mixing tank comprises an outer tank and an inner pipe which are coaxially arranged, one end of the outer tank is communicated with one end of the inner pipe, the other end of the outer tank is fixedly connected with the other end of the inner pipe, the inner pipe extends outwards from the end, and mixed gas entering the mixing tank from the hydrogen mixing pipe passes through the outer tank and the inner pipe and is reversely conveyed between the outer tank and the inner pipe so as to be uniformly mixed. According to the device, natural gas and hydrogen are preliminarily and dynamically mixed in the hydrogen mixing pipe and are further reversely rotated in the mixing tank to be dynamically mixed again, and the mixing uniformity of hydrogen-doped natural gas is fully improved through two times of dynamic mixing.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas mixing with hydrogen, in particular to a distributed natural gas mixing with hydrogen transmission and distribution device. Background Art

[0002] Natural gas hydrogen blending involves mixing hydrogen and natural gas in a specific ratio to form hydrogen-blended natural gas (HCNG). This hydrogen-blended natural gas is then transported to end users via natural gas pipelines. As a clean, zero-carbon energy source, the transportation and utilization of hydrogen have always been challenges hindering the development of the hydrogen energy industry chain. However, mature natural gas pipeline transportation technology and the extensive mileage of my country's natural gas pipeline network provide a solid foundation for the development of the natural gas hydrogen blending industry. Using natural gas pipelines to transport hydrogen-blended natural gas enables long-distance, large-scale, and low-energy transportation of hydrogen. Hydrogen-blended natural gas can also replace some natural gas consumption with hydrogen, alleviating tight natural gas supply.

[0003] However, the blending uniformity directly affects the subsequent combustion characteristics of hydrogen-blended natural gas and the safety of gas use. Therefore, how to improve the blending uniformity is an important technical issue facing this field. Utility Model Content

[0004] The purpose of the present invention is to provide a distributed natural gas mixed hydrogen transmission and distribution device to solve the above-mentioned problems existing in the prior art.

[0005] In order to solve the above problems, the utility model provides a distributed natural gas mixed hydrogen transmission and distribution device, comprising a connected hydrogen mixing pipe and a mixing tank, a hydrogen transmission pipe fixedly penetrated on the hydrogen mixing pipe, the hydrogen transmission pipe comprising a radial pipe and an axial pipe, the axial pipe extending in the opposite direction to the natural gas intake direction and parallel to the axial direction of the hydrogen mixing pipe, the radial pipe penetrates the hydrogen mixing pipe and coincides with the radial direction of the hydrogen mixing pipe, the hydrogen outlet of the hydrogen transmission pipe is arranged on the side wall of the axial pipe; the mixing tank comprises a coaxially arranged outer tank and an inner pipe, one end of the outer tank and the inner pipe are communicated, the other end of the outer tank and the inner pipe are fixedly connected and the inner pipe extends outward from the end, the mixed gas entering the mixing tank from the hydrogen mixing pipe passes through the outer tank and the inner pipe, and is reversely transported between the outer tank and the inner pipe for uniform mixing.

[0006] The distributed natural gas mixed hydrogen transmission and distribution device provided by the utility model also has the following technical features:

[0007] Furthermore, a plurality of hydrogen delivery pipes are provided on the hydrogen mixing pipe, and the plurality of hydrogen delivery pipes are arranged at equal intervals around the circumference of the hydrogen mixing pipe.

[0008] Furthermore, the mixing tank also includes an air inlet pipe, both ends of which are respectively connected to the hydrogen mixing pipe and the outer tank, and the air inlet pipe is fixedly connected to the outer tank.

[0009] Furthermore, the air inlet pipe is tangent to the cylindrical outer wall of the outer tank, and the air inlet pipe is arranged on one end of the outer tank where the outer tank is fixedly connected to the inner pipe.

[0010] Furthermore, the plurality of air inlet pipes are arranged at equal intervals around the circumference of the outer tank.

[0011] Furthermore, one end of the inner tube communicating with the outer tank is expanded.

[0012] Furthermore, an annular groove is provided inside the end of the outer tank that is in communication with the inner tube, and the annular groove guides the mixed gas from the outer tank to the inner tube in reverse direction.

[0013] Furthermore, the hydrogen mixing pipe is sequentially arranged in the direction of natural gas transmission and distribution as an intake pipe section, a spoiler cone section, a transition cone section and a mixing pipe section. The inner walls of the spoiler cone section and the transition cone section are frustum-shaped. The apex of the cone on the inner wall of the spoiler cone section and the transition cone section is facing the mixing pipe section. The conical inclination of the spoiler cone section is greater than that of the transition cone section. The hydrogen transmission pipe is fixedly passed through the mixing pipe section.

[0014] Furthermore, the hydrogen outlet on the hydrogen transmission pipe is arranged near the apex of the cone where the inner wall frustum of the turbulent cone section is located.

[0015] Furthermore, a flow stabilizing pipe is provided between the hydrogen mixing pipe and the mixing tank.

[0016] The utility model has the following beneficial effects: the device enables natural gas and hydrogen to be initially dynamically mixed in the hydrogen mixing pipe, and further reversely and dynamically mixed again in the mixing tank. Through the two dynamic mixing, the mixing uniformity of the hydrogen-blended natural gas is fully improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 for Figure 1 A partial enlarged view of

[0019] Figure 3 for Figure 2 The cross-section along line AA;

[0020] Figure 4 for Figure 1 A partial enlarged view of the hydrogen mixing pipe;

[0021] Figure 5 for Figure 4 The cross-section along line BB;

[0022] In the figure, the reference numerals are: hydrogen mixing pipe 1, air pipe section 11, turbulent cone section 12, transition cone section 13, mixing pipe section 14; hydrogen transmission pipe 2, hydrogen outlet 21, radial pipe 22, axial pipe 23; mixing tank 3, outer tank 31, inner pipe 32, air inlet pipe 33, annular groove 34, air outlet pipe 35; flow stabilizing pipe 4. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0024] like Figures 1 to 5 In the embodiment of the distributed natural gas hydrogen mixing transmission and distribution device of the present invention shown, the distributed natural gas hydrogen mixing transmission and distribution device includes a connected hydrogen mixing pipe 1 and a mixing tank 3. A hydrogen transmission pipe 2 is fixedly provided on the hydrogen mixing pipe 1. Natural gas flows in the hydrogen mixing pipe 1. The hydrogen transmission pipe 2 transmits hydrogen to the hydrogen mixing pipe 1. Therefore, the natural gas and hydrogen are preliminarily mixed in the hydrogen mixing pipe 1 and further transmitted to the mixing tank 3 for re-mixing.

[0025] The hydrogen transmission pipe 2 includes a radial pipe 22 and an axial pipe 23. The axial pipe 23 extends in the direction opposite to the natural gas inlet direction and is parallel to the axial direction of the hydrogen mixing pipe 1. The radial pipe 22 is arranged in the hydrogen mixing pipe 1 and coincides with the radial direction of the hydrogen mixing pipe 1. The hydrogen outlet 21 of the hydrogen transmission pipe 2 is arranged on the side wall of the axial pipe 23, so that high-pressure hydrogen is mixed into the hydrogen mixing pipe 1 from the radial direction, so that the flow directions of natural gas and hydrogen are perpendicular, so that natural gas and hydrogen can be fully in contact; the end of the axial pipe 23 is set to be semicircular or conical to make the flow of natural gas more stable and smooth; the radial pipe 22 and the axial pipe 23 can be fixedly connected by threaded connection or flange connection to facilitate later maintenance.

[0026] In this way, the natural gas and hydrogen in the hydrogen mixing pipe 1 can be preliminarily mixed dynamically.

[0027] The mixing tank 3 includes a coaxially arranged outer tank 31 and an inner tube 32. One end of the outer tank 31 and the inner tube 32 are connected inside the outer tank 31, and the other end of the outer tank 31 and the inner tube 32 are fixedly connected and the inner tube 32 extends outward from this end to form an outlet pipe 35 to further transport the mixed gas. The mixed gas entering the mixing tank 3 from the hydrogen mixing pipe 1 passes through the outer tank 31 and the inner tube 32, and is transported in reverse between the outer tank 31 and the inner tube 32 to be evenly mixed.

[0028] In this way, the mixed gas in the mixing tank 3 is mixed evenly again due to the reverse rotation.

[0029] The device performs preliminary dynamic mixing of natural gas and hydrogen in the hydrogen mixing pipe 1 and further reverses the mixing process in the mixing tank 3. Through the two dynamic mixing steps, the mixing uniformity of the hydrogen-blended natural gas is fully improved.

[0030] In one embodiment of the present application, preferably, a plurality of hydrogen transmission pipes 2 are provided on the hydrogen mixing pipe 1, and the plurality of hydrogen transmission pipes 2 are equidistantly arranged around the circumference of the hydrogen mixing pipe 1, and a plurality of axial pipes 23 are equidistantly arranged around the circumference of the hydrogen mixing pipe 1 in the inner cavity of the hydrogen mixing pipe 1; in this way, the disturbance and obstruction of the airflow in the hydrogen mixing pipe 1 by a single radial pipe 22 can be reduced: first, the disturbance of the airflow by the plurality of radial pipes 22 tends to a dynamic equilibrium state; second, the plurality of radial pipes 22 are diverted to reduce the diameter of the radial pipe 22 to reduce the obstruction of gas flow; the example in the figure shows that three hydrogen transmission pipes 2 are provided on the hydrogen mixing pipe 1.

[0031] In one embodiment of the present application, preferably, the mixing tank 3 further includes an air inlet pipe 33, the two ends of which are respectively connected to the hydrogen mixing pipe 1 and the outer tank 31, and the air inlet pipe 33 is fixedly connected to the outer tank 31. The air inlet pipe 33 is a connecting pipe between the mixing tank 3 and the hydrogen mixing pipe 1, and the air inlet pipe 33 and the outer tank 31 can be fixedly connected by welding.

[0032] In one embodiment of the present application, preferably, the air inlet pipe 33 is tangent to the cylindrical outer wall of the outer tank 31, so that the mixed gas entering from the air inlet pipe 33 will first move circumferentially around the inner wall of the outer tank 31, and gradually transform into axial operation due to the circulation effect of the outer tank 31 and the inner tube 32, thereby improving the mixing uniformity of the gas in the axial and axial transformation; the air inlet pipe 33 is provided at one end of the outer tank 31 where the outer tank 31 is fixedly connected to the inner tube 32, and the mixed gas undergoes axial and axial transformation from one end to the other end of the outer tank 31.

[0033] In one embodiment of the present application, preferably, multiple air intake pipes 33 are equidistantly arranged around the circumference of the outer tank 31, so that when the mixed gas entering the air intake pipes 33 moves circumferentially around the inner wall of the outer tank 31, the mixed gas in the multiple air intake pipes 33 mixes to improve the mixing uniformity of the hydrogen-blended natural gas; the example in the figure shows that four air intake pipes 33 are arranged.

[0034] In one embodiment of the present application, preferably, the end of the inner tube 32 that communicates with the outer tank 31 is expanded, so that the flow efficiency of the gas in the outer tank 31 when passing between the outer tank 31 and the inner tube 32 is changed to improve the mixing uniformity.

[0035] In one embodiment of the present application, preferably, an annular groove 34 is provided inside the end of the outer tank 31 that communicates with the inner tube 32 , and the annular groove 34 reversely guides the mixed gas from the outer tank 31 to the inner tube 32 .

[0036] In one embodiment of the present application, preferably, the hydrogen mixing pipe 1 is arranged in sequence in the direction of natural gas transmission and distribution as an intake pipe section 11, a spoiler cone section 12, a transition cone section 13 and a mixing pipe section 14, the inner walls of the spoiler cone section 12 and the transition cone section 13 are frustum-shaped, the apex of the cone on the inner wall of the spoiler cone section 12 and the transition cone section 13 is located toward the mixing pipe section 14, the conical inclination of the spoiler cone section 12 is greater than that of the transition cone section 13, and the hydrogen transmission pipe 2 is fixedly passed through the mixing pipe section 14.

[0037] In the above embodiment, after the natural gas enters the turbulent cone section 12 through the gas pipe section 11, due to the smaller diameter, a portion of the peripheral gas changes direction (toward the apex of the cone) and mixes with the normally flowing gas in the inner periphery, causing turbulence in the natural gas. The turbulent flow combines with the hydrogen in the hydrogen transmission pipe 2 provided in the mixing pipe section 14, thereby improving the uniformity of gas mixing.

[0038] In the above embodiment, the hydrogen outlet 21 on the hydrogen transmission pipe 2 is provided near the apex of the cone where the inner wall frustum of the turbulent cone section 12 is located, and the turbulent flow effect near the apex is most obvious.

[0039] In one embodiment of the present application, preferably, a flow stabilizing tube 4 is provided between the hydrogen mixing tube 1 and the mixing tank 3 to stabilize the flow of the mixed gas before entering the mixing tank 3 .

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A distributed natural gas mixed hydrogen transmission and distribution device, characterized in that: The invention comprises a hydrogen mixing pipe (1) and a mixing tank (3) which are connected to each other, wherein a hydrogen delivery pipe (2) is fixedly provided on the hydrogen mixing pipe (1), and the hydrogen delivery pipe (2) comprises a radial pipe (22) and an axial pipe (23), wherein the axial pipe (23) extends in a direction opposite to the natural gas inlet direction and is parallel to the axial direction of the hydrogen mixing pipe (1), wherein the radial pipe (22) is provided in the hydrogen mixing pipe (1) and coincides with the radial direction of the hydrogen mixing pipe (1), and the hydrogen outlet (21) of the hydrogen delivery pipe (2) is provided on the axial pipe. (23) side wall; the mixing tank (3) includes an outer tank (31) and an inner tube (32) arranged coaxially, one end of the outer tank (31) and the inner tube (32) are connected, the other end of the outer tank (31) and the inner tube (32) are fixedly connected and the inner tube (32) extends outward from the end, and the mixed gas entering the mixing tank (3) from the hydrogen mixing tube (1) passes through the outer tank (31) and the inner tube (32), and is reversely transported between the outer tank (31) and the inner tube (32) to be evenly mixed.

2. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 1, characterized in that: A plurality of hydrogen transmission pipes (2) are provided on the hydrogen mixing pipe (1), and the plurality of hydrogen transmission pipes (2) are arranged at equal intervals around the circumference of the hydrogen mixing pipe (1).

3. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 1, characterized in that: The mixing tank (3) further includes an air inlet pipe (33), both ends of which are in communication with the hydrogen mixing pipe (1) and the outer tank (31), respectively. The air inlet pipe (33) is fixedly connected to the outer tank (31).

4. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 3, characterized in that: The air inlet pipe (33) is tangent to the cylindrical outer wall of the outer tank (31), and the air inlet pipe (33) is provided on one end of the outer tank (31) where the outer tank (31) and the inner pipe (32) are fixedly connected.

5. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 4, characterized in that: A plurality of air inlet pipes (33) are arranged at equal intervals around the circumference of the outer tank (31).

6. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 1, characterized in that: One end of the inner tube (32) communicating with the outer tank (31) is expanded.

7. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 1, characterized in that: An annular groove (34) is provided inside the end of the outer tank (31) that communicates with the inner tube (32). The annular groove (34) guides the mixed gas from the outer tank (31) to the inner tube (32) in reverse direction.

8. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 1, characterized in that: The hydrogen mixing pipe (1) is sequentially arranged in the direction of natural gas transmission and distribution as an intake pipe section (11), a turbulent cone section (12), a transition cone section (13) and a mixing pipe section (14); the inner walls of the turbulent cone section (12) and the transition cone section (13) are in the shape of a truncated cone; the apex of the cone on the inner wall of the turbulent cone section (12) and the transition cone section (13) faces the mixing pipe section (14); the conical inclination of the turbulent cone section (12) is greater than that of the transition cone section (13); and the hydrogen transmission pipe (2) is fixedly arranged in the mixing pipe section (14).

9. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 8, characterized in that: The hydrogen outlet (21) on the hydrogen transmission pipe (2) is arranged near the apex of the cone where the inner wall frustum of the turbulent cone section (12) is located.

10. The distributed natural gas mixed hydrogen transmission and distribution device according to claim 8, characterized in that: A flow stabilizing pipe (4) is provided between the hydrogen mixing pipe (1) and the mixing tank (3).

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