CN219376723U - Gas mixing device - Google Patents

Abstract

The application discloses a gas mixing device relates to gas mixing equipment production technical field. The gas mixing device comprises a device main body, a flow guiding device, a main gas inlet pipe and a branch gas inlet pipe, wherein the first end of the main gas inlet pipe is communicated with a gas inlet of the device main body, the main gas inlet pipe is used for introducing a first medium, the first end of the branch gas inlet pipe is communicated with the first end of the main gas inlet pipe, the branch gas inlet pipe is used for introducing a second medium, the flow guiding device is arranged in the device main body, and the flow guiding device and the gas inlet of the device main body are oppositely arranged. The scheme can solve the problem of uneven mixing of the prior hydrogen-doped natural gas.

Description

Gas mixing device

Technical Field

The application belongs to the technical field of gas mixing equipment, and particularly relates to a gas mixing device.

Background

Natural gas hydrogen loading is one of the main modes of transition from fossil energy to hydrogen energy and acceleration of the development of the hydrogen energy industry, and can not only relieve the dependence on fossil energy, but also effectively reduce CO ₂ And the emission of pollutants, and the like, and simultaneously provides technical reserves for hydrogen energy large-scale application.

At present, natural gas hydrogen-adding equipment mainly conveys natural gas and hydrogen into an equipment main body through two pipelines respectively, or a hydrogen-adding pipeline is connected above the natural gas pipeline so as to be directly communicated into the natural gas conveying pipeline. However, due to the different densities of the natural gas and the hydrogen, the natural gas and the hydrogen are unevenly mixed, and the combustion of the hydrogen-doped natural gas is affected.

Disclosure of Invention

The embodiment of the application aims to provide a gas mixing device which can solve the problem of non-uniform mixing of the prior hydrogen-doped natural gas.

In order to solve the technical problems, the application is realized as follows:

the embodiment of the application provides a gas mixing device, including device main part, guiding device, inlet main pipe and inlet branch pipeline, inlet main pipe's first end with the air inlet of device main part is linked together, inlet main pipe is used for letting in first medium, inlet branch pipeline's first end with inlet main pipe's first end is linked together, inlet branch pipeline is used for letting in the second medium, guiding device set up in the device main part, guiding device with the air inlet of device main part sets up relatively.

In this application embodiment, be equipped with guiding device in the device main part, and guiding device and device main part's air inlet set up relatively, let in first medium in the device main part when the main line of admitting air, when the branch pipeline of admitting air lets in the second medium in the device main part, first medium and second medium meet in the junction of the branch pipeline of admitting air and main line of admitting air in order to form mixed medium, this mixed medium flows to collide with guiding device through the air inlet of device main part to improve the flow rate of the molecule of mixed medium, in order to make mixed medium further misce bene. Therefore, the embodiment of the application can solve the problem of uneven mixing of the prior hydrogen-doped natural gas.

Drawings

FIG. 1 is a schematic view of a gas mixing device according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a guide vane according to an embodiment of the present disclosure.

Reference numerals illustrate:

100-device body, 110-air inlet, 120-air outlet;

200-flow guiding devices, 210-flow guiding central shafts, 220-flow guiding blades, 221-first blade segments, 222-second blade segments, 223-boundary layers, 223 a-laminar boundary layers, 223 b-turbulent boundary layers, 230-front flow guiding covers, 231-first flow guiding surfaces, 240-rear flow guiding covers, 241-second flow guiding surfaces, 250-flow guiding plates, 251-first plate segments, 252-second plate segments, 253-third plate segments and 260-supporting columns;

300-main inlet pipe;

400-air inlet branch pipe;

500-main exhaust pipe.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings of the embodiments of the present application, and it is apparent that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.

The gas mixing device provided by the embodiment of the application is described in detail below by means of specific embodiments and application scenes thereof with reference to the accompanying drawings.

As shown in fig. 1 to 2, the embodiment of the present application discloses a gas mixing device, which includes a device main body 100, a flow guiding device 200, a main air inlet pipe 300 and a branch air inlet pipe 400, wherein a first end of the main air inlet pipe 300 is connected to an air inlet 110 of the device main body 100, the main air inlet pipe 300 is used for introducing a first medium, and optionally, the first medium may be natural gas, or of course, other gases, which is not limited herein specifically; optionally, the central axis of the main inlet pipe 300 coincides with the central axis of the apparatus body 100 to facilitate the circulation of the medium. The first end of the air inlet branch pipe 400 is communicated with the first end of the air inlet main pipe 300, and the air inlet branch pipe 400 is used for introducing a second medium, optionally, the second medium may be hydrogen, or may be other gases, which is not particularly limited herein; optionally, an included angle is formed between the central axis of the air inlet branch pipe 400 and the central axis of the device main body 100, the diameter of the air inlet main pipe 300 is larger than that of the air inlet branch pipe 400, and the connection part of the air inlet branch pipe 400 and the air inlet main pipe 300 is located at the upstream of the port of the first end of the air inlet main pipe 300, so that the air inlet branch pipe 400 is conveniently arranged, and the flowing path of the mixed medium formed by the first medium and the second medium is prolonged, so that the mixing uniformity of the mixed medium is improved. The flow guiding device 200 is disposed in the device body 100, and the flow guiding device 200 is disposed opposite to the air inlet 110 of the device body 100. Alternatively, the device main body 100 may have a cylindrical structure, and both ends of the cylindrical structure have hemispherical structures, and a diversion channel is formed between the hemispherical structure and the diversion device 200 to guide the flow direction distribution of the mixed medium, so as to facilitate the circulation of the mixed medium.

In this embodiment, when the main air intake pipe 300 introduces the first medium into the device main body 100 and the branch air intake pipe 400 introduces the second medium into the device main body 100, the first medium and the second medium are combined at the connection between the branch air intake pipe 400 and the main air intake pipe 300 to form a mixed medium, and the mixed medium flows to collide with the flow guiding device 200 through the air inlet 110 of the device main body 100, so as to increase the flow rate of molecules of the mixed medium, and further mix the mixed medium uniformly. Therefore, the embodiment of the application can solve the problem of uneven mixing of the prior hydrogen-doped natural gas. Of course, the gas mixing device is also suitable for mixing other mediums, and is not limited to mixing hydrogen-loaded natural gas, and the embodiments of the present application are not limited in this regard.

In an alternative embodiment, the flow guiding device 200 includes a flow guiding central shaft 210 and a plurality of flow guiding vanes 220, alternatively, the number of the flow guiding vanes 220 may be even, or of course, may be odd, which is not limited herein. The first end of each guide vane 220 is connected to the guide center shaft 210, alternatively, the first end of each guide vane 220 may be connected to the guide center shaft 210 by welding, or may be connected by bonding, bolting, or the like. The second end of each guide vane 220 is connected to the inner wall of the apparatus body 100, and each guide vane 220 is disposed at intervals along the circumferential direction of the guide center shaft 210, so that a plurality of guide channels are formed among the guide center shaft 210, each guide vane 220 and the inner wall of the apparatus body 100 for the mixed medium to pass through. In the scheme, the contact area between the mixed medium and the inner wall of the flow guide channel is larger, so that the probability of collision between molecules of the mixed medium and the inner wall of the flow guide channel is improved, the movement between the molecules of the mixed medium is accelerated, and the mixing uniformity of the mixed medium is improved; meanwhile, the flow guiding device 200 in the scheme is fixed, so that the stability of the mixed medium is improved, and stable combustion of downstream equipment is facilitated. Of course, the flow guiding device 200 may be a swirl vane, which rotates in the device main body 100, thereby accelerating the mixing uniformity of the mixed medium.

In the above embodiment, the surface pressure distribution of the guide vane 220 satisfies the following formula:

wherein P is _i Representing the static pressure of the surface of the guide vane 220; p (P) ₁ Representing the static pressure of the mixing medium after it exits the guide vane 220; ρ ₁ Representing the isentropic density of the mixed media within the diversion channel; c ₁ Representing the isentropic velocity of the mixed media within the diversion channel.

When the mixed medium enters the guide channel, the velocity of the air flow is zero at the standing point A of the guide vane 220, and the pressure coefficient is approximately equal to 1 #) The method comprises the steps of carrying out a first treatment on the surface of the After stagnation point a, the gas stream expands, the pressure drops, and the flow rate increases. As the mixed medium passes through the guide channel, the boundary layer 223 of the surface of the guide vane 220 will be increased due to the influence of the viscosity of the gas and the roughness and attack angle of the surface of the guide vane 220.

In a further alternative embodiment, the flow guiding device 200 further includes a front flow guiding cover 230, where the front flow guiding cover 230 is connected to the flow guiding central shaft 210, and the front flow guiding cover 230 has a first flow guiding surface 231, where the first flow guiding surface 231 is opposite to the air inlet 110 of the device main body 100, and the mixed medium contacts the first flow guiding surface 231 of the front flow guiding cover 230 after entering the device main body 100, so as to guide the flow direction distribution of the mixed medium, and make the mixed medium smoothly enter the flow guiding channel, thereby improving the mixing uniformity and stability of the mixed medium. Optionally, in the extending direction of the front pod 230 toward the central flow axis 210, the cross-sectional area of the front pod 230 is gradually increased, that is, the front pod 230 has a tapered structure, so that the mixed medium enters the flow guiding channel along the first flow guiding surface 231, and it should be noted that, the cross-sectional area specifically refers to an area surrounded by an outer contour line of the front pod 230. Of course, the front pod 230 may also have a hemispherical structure, but the hemispherical structure has a larger curvature, and the flow guiding effect is not as good as that of the front pod 230 with a conical structure.

In a further alternative embodiment, the flow guiding device 200 further includes a rear flow guiding cover 240, where the front flow guiding cover 230, the flow guiding central shaft 210 and the rear flow guiding cover 240 are sequentially connected, that is, the maximum diameter of the front flow guiding cover 230 is equal to the diameter of the flow guiding central shaft 210 and is equal to the maximum diameter of the rear flow guiding cover 240, the rear flow guiding cover 240 has a second flow guiding surface 241, and the mixed medium enters the flow guiding channel along the first flow guiding surface 231 and then flows out of the flow guiding channel and flows along the second flow guiding surface 241, so as to improve the outlet distribution condition of the mixed medium, and avoid that after flowing out of the flow guiding channel, the mixed medium forms turbulence in the center of the device body 100 due to the rotational flow, so that the pressure loss of the mixed medium is increased. In the extending direction of the central axis 210 toward the rear pod 240, the cross-sectional area of the rear pod 240 gradually decreases, that is, the rear pod 240 has a tapered structure to extend the flow path of the mixed medium, so as to improve the uniformity of the mixed medium, and it should be noted that the cross-sectional area specifically refers to the area of the area surrounded by the outer contour line of the rear pod 240. Of course, the rear pod 240 may also have a hemispherical structure, and the flow path of the mixed medium flowing along the flow guiding surface of the rear pod 240 of the hemispherical structure is not longer than the flow path of the flow guiding surface of the rear pod 240 of the conical structure, so that the mixing uniformity of the mixed medium is not as good as that of the conical structure.

In still another alternative embodiment, the distance between the adjacent guide vanes 220 may be constant in the flowing direction of the medium in the apparatus main body 100, i.e. the adjacent guide vanes 220 are arranged in parallel, or the distance between the adjacent guide vanes 220 is gradually reduced, where the guide channels are in a tapered nozzle structure, i.e. the guide channels are in a converging state, which accelerates the airflow passing through the guide channels, and thins the boundary layer 223 of the guide vane 220, thereby reducing the flow velocity loss of the mixed medium, increasing the flow velocity of the mixed medium, and further improving the mixing uniformity of the mixed medium.

Alternatively, the thickness of the guide vane 220 may be constant in the flow direction of the medium within the apparatus body 100. In other embodiments, the guide vane 220 includes a first vane segment 221 and a second vane segment 222 connected to each other, and the second vane segment 222 is located downstream of the first vane segment 221, optionally, in the flow direction of the medium in the apparatus main body 100, the thickness of each of the first vane segment 221 and the second vane segment 222 is gradually reduced, at this time, the mixed medium passes through a guide channel formed between the adjacent first vane segment 221 and the inner wall of the apparatus main body 100, and then passes through another guide channel formed between the adjacent second vane segment 222 and the inner wall of the apparatus main body 100, so as to increase the collision probability between the molecules of the mixed medium and the guide vane 220, and improve the mixing uniformity of the mixed medium.

In another embodiment, in the flowing direction of the medium in the device main body 100, the thickness of the first blade segment 221 is gradually increased, and the thickness of the second blade segment 222 is gradually decreased, so that the guide vane 220 with such a structure is convenient to manufacture, and meanwhile, the flowing path of the mixed medium can be prolonged, so as to further improve the mixing uniformity of the mixed medium. Alternatively, the cross-sectional shape of the first blade segment 221 in the width direction thereof may be semicircular, which has a flow guiding effect to facilitate the flow of the mixed medium.

In a further alternative embodiment, the guide vane 220 has a flat plate-shaped structure, or the guide vane 220 has an arc-shaped structure, that is, the guide vane 220 has an arc-shaped cross-section along the thickness direction thereof, and the guide vane 220 has a back surface and a web surface, wherein the boundary layer 223 of the back surface of the guide vane 220 includes a laminar boundary layer 223a and a turbulent boundary layer 223b connected to each other, and the thickness of the laminar boundary layer 223a is greater than the thickness of the turbulent boundary layer 223b in the flow direction of the mixed medium, so that the mixed medium is rapidly expanded at the back surface of the guide vane 220, and the flow rate is rapidly increased; at the ventral surface of the guide vane 220, the airflow is accelerated faster, then the airflow pressure is slowly reduced along the ventral surface, and accordingly the airflow speed is also slowly increased, and the airflow pressure is obviously reduced when approaching to the outlet of the guide channel. In this scheme, swirl channels are formed between the guide vanes 220 of adjacent arc structures, so that the flow direction of the mixed medium is changed, the mixed medium is swirled, and is blended under the effect of turbulence, and meanwhile, the flow path of the mixed medium is further prolonged, and the mixing uniformity of the mixed medium is improved.

In the embodiment in which the distance between the adjacent guide vanes 220 is gradually reduced, the guide vanes 220 have an arc structure to form a nozzle type guide channel of a cyclone type, and the gas flow path is prolonged while the flow rate of the mixed medium is increased, so that the uniformity and stability of the mixed medium are further improved.

In an alternative embodiment, the flow guiding device 200 further includes a plurality of flow guiding plates 250, where the plurality of flow guiding plates 250 are all disposed in the device main body 100, alternatively, each flow guiding plate 250 may be fixedly connected to an inner wall of the device main body 100 by welding, bonding, bolting, etc. to fix the flow guiding plates 250, so that the flow guiding plates 250 are relatively stable, and of course, other connection manners may also be adopted, which is not limited herein; in another embodiment, a supporting column 260 is disposed in the device main body 100, and each baffle 250 is sleeved on the supporting column 260 to fix the baffle 250, and at this time, each baffle 250 may contact with the inner wall of the device main body 100 or have a gap, so as to facilitate the disassembly, assembly and maintenance of each baffle 250; further alternatively, the number of the support columns 260 is at least two, each support column 260 is arranged at intervals, and the connecting holes are arranged in one-to-one correspondence with the support columns 260, so that the stability of the deflector 250 is further improved. The plurality of baffles 250 are disposed downstream of the baffle center shaft 210, the plurality of baffles 250 are disposed opposite to the exhaust port 120 of the apparatus main body 100, and the baffles 250 are disposed along the radial direction of the apparatus main body 100, so that collisions between gas molecules are further enhanced by the baffles 250 to promote uniformity of the mixed medium, and the mixed medium flowing through the baffles 250 is discharged to downstream equipment through the exhaust port 120 of the apparatus main body 100.

Optionally, the gas mixing device further comprises a main exhaust pipe 500, one end of the main exhaust pipe 500 being in communication with the exhaust port 120 of the device body 100, so as to facilitate the entry of the mixing medium into the downstream equipment.

Alternatively, the baffle 250 may be a corrugated plate; in other embodiments, the baffle 250 includes a first plate segment 251, a second plate segment 252 and a third plate segment 253 that are sequentially connected, where the second plate segment 252 is obliquely disposed, which not only has a flow guiding effect, but also can prolong the flow path of the mixed medium and improve the uniformity of the mixed medium. Optionally, the second plate segment 252 is provided with a connection hole, and the connection hole of the second plate segment 252 is sleeved on the support column 260, so as to facilitate the arrangement of the deflector 250. Optionally, the first plate segment 251 is located at a higher position than the third plate segment 253 to facilitate the smooth flow of the mixing medium from the first plate segment 251, the second plate segment 252 and the third plate segment 253. The first plate segment 251 and the third plate segment 253 are arc-shaped structures, the concave direction of the first plate segment 251 is opposite to that of the third plate segment 253, and the collision frequency of molecules of the mixed medium and the guide plate 250 is improved by increasing the contact area of the mixed medium and the guide plate 250, so that the uniformity of the mixed medium is improved.

Alternatively, the direction of the depression of the first plate segment 251 may be opposite to the direction of gravity, and the direction of the depression of the third plate segment 253 may be the same as the direction of gravity, thereby providing a flow direction distribution for the mixed media, allowing the mixed media to smoothly pass through the baffle 250. Alternatively, the second plate segment 252 may be a flat plate structure.

Alternatively, the central guide shaft 210 may be a solid structure, where the central guide shaft 210 has a relatively large weight; in other embodiments, the central flow shaft 210 is hollow, thereby reducing the weight of the central flow shaft 210.

Alternatively, each guide vane 220 may be fully welded to the inner wall of the apparatus body 100, but the full welding may easily cause deformation of the apparatus body 100 and each guide vane 220. Based on this, in an alternative embodiment, a part of the guide vane 220 is fully welded to the inner wall of the apparatus body 100 to ensure the connection stability of the entire guide apparatus 200, and another part of the guide vane 220 is spot welded to the inner wall of the apparatus body 100, thereby reducing the risk of deformation of the apparatus body 100 and the part of the guide vane 220. Alternatively, the number of guide vanes 220 fully welded to the inner wall of the apparatus body 100 may be three, and each guide vane 220 is uniformly distributed along the circumferential direction of the guide center shaft 210, thereby ensuring the connection stability of the guide apparatus 200.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims (10)

1. The utility model provides a gas mixing device, its characterized in that, including device main part (100), guiding device (200), main air intake pipe (300) and inlet branch pipeline (400), the first end of main air intake pipe (300) with air inlet (110) of device main part (100) are linked together, main air intake pipe (300) are used for letting in first medium, the first end of inlet branch pipeline (400) with the first end of main air intake pipe (300) are linked together, inlet branch pipeline (400) are used for letting in the second medium, guiding device (200) set up in device main part (100), guiding device (200) with air inlet (110) of device main part (100) set up relatively.

2. The gas mixing device according to claim 1, wherein the flow guiding device (200) comprises a flow guiding central shaft (210) and a plurality of flow guiding vanes (220), a first end of each flow guiding vane (220) is connected to the flow guiding central shaft (210), a second end of each flow guiding vane (220) is connected to an inner wall of the device body (100), and the flow guiding vanes (220) are arranged at intervals along the circumferential direction of the flow guiding central shaft (210).

3. The gas mixing device according to claim 2, wherein the flow guiding device (200) further comprises a front flow guiding cover (230), the front flow guiding cover (230) is connected with the flow guiding central shaft (210), the front flow guiding cover (230) is provided with a first flow guiding surface (231), the first flow guiding surface (231) is arranged opposite to the gas inlet (110) of the device main body (100), and the cross section area of the front flow guiding cover (230) gradually increases in the extending direction of the front flow guiding cover (230) towards the flow guiding central shaft (210).

4. A gas mixing device according to claim 3, wherein the flow guiding device (200) further comprises a rear flow guiding hood (240), the front flow guiding hood (230), the flow guiding central shaft (210) and the rear flow guiding hood (240) being connected in sequence, the rear flow guiding hood (240) having a second flow guiding surface (241), the cross-sectional area of the rear flow guiding hood (240) gradually decreasing in the direction of extension of the flow guiding central shaft (210) towards the rear flow guiding hood (240).

5. The gas mixing device according to claim 2, wherein the distance between adjacent guide vanes (220) gradually decreases in the flow direction of the medium in the device body (100).

6. The gas mixing device according to claim 2, wherein the guide vane (220) comprises a first vane segment (221) and a second vane segment (222) connected, the second vane segment (222) being located downstream of the first vane segment (221), the thickness of both the first vane segment (221) and the second vane segment (222) gradually decreasing or the thickness of the first vane segment (221) gradually increasing, the thickness of the second vane segment (222) gradually decreasing in the flow direction of the medium within the device body (100).

7. The gas mixing device according to claim 6, wherein the guide vane (220) has an arc-shaped structure.

8. The gas mixing device of claim 2, wherein the flow guiding device (200) further comprises a plurality of flow guiding plates (250), the plurality of flow guiding plates (250) are all arranged in the device main body (100), the plurality of flow guiding plates (250) are located at the downstream of the flow guiding central shaft (210), the plurality of flow guiding plates (250) are arranged opposite to the gas outlet (120) of the device main body (100), and each flow guiding plate (250) is arranged along the radial direction of the device main body (100).

9. The gas mixing device according to claim 8, wherein the baffle (250) comprises a first plate section (251), a second plate section (252) and a third plate section (253) which are sequentially connected, the second plate section (252) is obliquely arranged, the first plate section (251) and the third plate section (253) are arc-shaped structures, and the concave direction of the first plate section (251) is opposite to the concave direction of the third plate section (253).

10. The gas mixing device according to claim 2, wherein the central flow guiding shaft (210) is of hollow construction;

one part of the guide vane (220) is in full-welded connection with the inner wall of the device main body (100), and the other part of the guide vane (220) is in spot-welded connection with the inner wall of the device main body (100).