A gas mixing device and its application

Abstract

This invention relates to a gas mixing device and its application, addressing the problems of high methane concentration in localized areas, poor mixing uniformity, and limited gas mixing ratios in the mixing of exhaust gas and low-concentration methane. The gas mixing device comprises: a spiral distributor and a group of flow deflectors arranged sequentially along the airflow direction within an airflow duct; at least one spiral distributor is provided; the flow deflector group includes a first flow deflector and a second flow deflector symmetrically arranged; the minimum distance between the spiral distributor and the flow deflector group is ≥ 0.3 times the equivalent circular diameter of the airflow duct; the bottom surface of the conical opening structure of the flow deflector closest to the spiral distributor faces the spiral distributor. The gas mixing device provided by this invention, through its design and the specific arrangement of the spiral distributor combined with the flow deflector group, achieves efficient mixing of exhaust gas and methane gas, improving the uniformity of methane in the mixed gas, and reducing non-uniformity to below 5%.

Description

Technical Field

[0001] This invention relates to the field of gas mixing, specifically to a gas mixing device and its application, and more particularly to a mixing device for exhaust air and low-concentration methane and its application. Background Technology

[0002] In coal mining, the methane concentration in the central return air shaft must not exceed 0.75%, while the methane concentration in the exhaust air is extremely low. Since the coal mine does not utilize it, it is directly emitted into the atmosphere. At the same time, most of the low-concentration methane extracted by the coal mine pumping station is directly discharged into the air. To date, there is no effective technical solution that can utilize it without causing secondary pollution.

[0003] Currently, the main principle of coal mine exhaust air and low-concentration gas extraction oxidation technology is regenerative high-temperature methane oxidation. The main process involves collecting the 20℃-30℃ exhaust air from the existing coal mine through negative pressure without affecting the coal mine extraction system. The exhaust air is then transported into the exhaust air pipeline under negative pressure. The exhaust air and extracted gas are mixed with the methane through a mixing device until the methane concentration reaches 1.2%, and then transported to the regenerative oxidation device for utilization.

[0004] For example, CN103933837A discloses a coal mine exhaust air oxidation system that is stable in operation, has a short system start-up time, and high heat recovery efficiency. Through the coordinated combination of a gas distribution device, the system body, a reversing device, a start-up device, and a monitoring and control device, especially the reversing device composed of two three-way valves, exhaust air losses in the pipeline are effectively reduced. The entire system operation, including the switching of the reversing device, flow measurement and regulation, pressure and temperature measurement, methane concentration monitoring and feedback, is all conducted under the monitoring of the monitoring device. Real-time monitoring and measurement data can be obtained, and timely adjustments to the exhaust air oxidation operation can be made to achieve energy saving and emission reduction effects. This solution is stable in operation, has a short system start-up time, and high heat recovery efficiency.

[0005] CN108926996A discloses a cyclone-type coal mine exhaust gas catalytic oxidation reactor, belonging to the field of ultra-low concentration methane catalytic oxidation technology. It includes: an inlet and outlet system, a preheating system, a reaction system, a piping system, and a monitoring and control system. Exhaust gas, after being preheated in a preheater, enters the first reactor tangentially through a volute. As the gas rotates downwards along the inner wall of the reactor, it reacts with the catalyst coated on the inner wall to generate CO2 and H2O. Simultaneously, dust particles in the exhaust gas fall into an ash hopper along the inner wall of the reactor for purification. The high-temperature gas after the reaction rotates upwards along the axis and is finally discharged through the exhaust pipe into the second reactor. The gas undergoes the same reaction in the second reactor, releasing a large amount of heat. This alternating process achieves self-sustaining operation of the device. This scheme can handle exhaust gas with a concentration of 0.1%-5%, with a maximum processing capacity of 1000 m³. 3The gas flow rate can reach 0.35 m / s, and the operating temperature of the reactor can reach up to 1000℃. Its removal rate is over 80%.

[0006] However, the safe and uniform mixing of exhaust air and low-concentration extracted gas is a key link and core technology of this process. The problems with the existing technology are: (1) Low-concentration extracted gas enters the exhaust air system in a concentrated manner, causing the local methane concentration to exceed 5%, reaching the explosive concentration zone and creating safety hazards. (2) The mixing uniformity is poor, resulting in uneven concentrations in the subsequent multiple regenerative oxidation units, and the uniformity cannot be guaranteed, affecting the regenerative oxidation effect. (3) The current exhaust air and low-concentration gas mixing facilities are complex, with high wind resistance and excessive energy consumption of the oxidizer top fan. (4) Poor adaptability to the mixing ratio of exhaust air and gas. Summary of the Invention

[0007] In view of the problems existing in the prior art, the purpose of the present invention is to provide a gas mixing device and its application to solve the problems of high local methane concentration, poor mixing uniformity, and limited gas mixing ratio in the mixing of exhaust gas and low-concentration methane.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] The first invention provides a gas mixing device, which includes: a spiral distributor and a group of flow deflectors arranged sequentially along the gas flow direction in a gas flow duct;

[0010] At least one spiral distributor shall be provided;

[0011] The spoiler group includes a first spoiler and a second spoiler arranged symmetrically.

[0012] The minimum distance between the spiral distributor and the spoiler group is ≥ 0.3 times the equivalent circle diameter of the airflow duct;

[0013] The bottom surface of the tapered opening structure of the spoiler group near the spiral distributor faces the spiral distributor.

[0014] The gas mixing device provided by this invention, through the design of the gas mixing device and the setting method of a specific spiral distributor combined with a flow disruptor group, achieves efficient mixing of exhaust gas and methane gas, improves the uniformity of methane in the mixed gas, and reduces the non-uniformity to below 5%.

[0015] In this invention, during the use of the gas mixing device, gas is introduced into the airflow channel and the spiral distributor respectively. However, the concentration of the target substance in the gas introduced into the airflow channel during mixing is less than the concentration of the target substance in the gas introduced into the spiral distributor. At this time, the spiral distributor is connected to a gas inlet pipe. An exemplary application process is that during the use of the gas mixing device, exhaust air is introduced into the airflow pipe and methane gas is introduced into the spiral distributor. The concentration of methane in the exhaust air is much lower than the concentration of methane gas.

[0016] In this invention, low-concentration methane in the gas mixing device first reaches the center of the exhaust air duct along the spiral distributor, and then extends and is released from the center along the circumference towards the inner wall of the exhaust air duct. Due to frictional resistance, the methane release speed decreases as it approaches the inner wall of the exhaust air duct, which is consistent with the trend that the exhaust air velocity is faster at the center of the exhaust air duct cross-section and slower near the inner wall, thus promoting uniform mixing of methane and exhaust air. Symmetrical flow deflectors are installed after the distributor. After passing through the first-stage flow deflector, the exhaust air at the center of the duct flows outward, and after passing through the second-stage flow deflector, the exhaust air on the outer side flows towards the center. This reciprocating flow deflection further enhances the uniformity of gas mixing.

[0017] In this invention, non-uniformity refers to the maximum deviation between the average volume concentration of methane at all points measured at a cross-section perpendicular to the center line of the pipeline at a distance such as 5-15m before the mixed gas enters the exhaust gas utilization device and the volume concentration at each point. In other words, in this invention, non-uniformity refers to the deviation of the volume concentration of methane at each point on the cross-section from the average volume concentration of methane on the cross-section.

[0018] In this invention, the cross-sectional shape of the airflow duct perpendicular to the airflow direction can be circular or other polygonal shapes, such as triangles, squares, rectangles, pentagons, etc. If it is circular, then the equivalent circle diameter of the airflow duct is the diameter of the circle. For other shapes, the equivalent circle diameter can be calculated according to conventional techniques in the field.

[0019] In this invention, multiple spiral distributors can be set at intervals, such as 2, 3, 4 or 5, but are not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0020] In this invention, when multiple spiral distributors are arranged at intervals, they can be arranged at equal intervals or at non-equal intervals. For example, the spacing between adjacent spiral distributors can be 2-6 times the diameter of the gas inlet pipe. For example, when the spiral distributors are used to supply gas, the spacing between the spiral distributors is 2-6 times the diameter of the gas inlet pipe.

[0021] In this invention, the gas inlet pipe of the spiral distributor can be designed as an integral part of the spiral tube of the spiral distributor, in which case the diameter of the gas inlet pipe is the same as the diameter of the spiral tube of the spiral distributor; or it can be set separately, in which case the gas inlet pipe can be selected according to actual needs, such as being 1-1.5 times the diameter of the spiral tube.

[0022] In this invention, the minimum distance between the spiral distributor and the spoiler group is ≥ 0.3 times the equivalent circle diameter of the airflow duct, for example, it can be 0.3 times, 0.32 times, 0.34 times, 0.36 times, 0.38 times, 0.4 times, 0.42 times, 0.44 times, 0.46 times, 0.48 times, 0.5 times, 0.52 times, 0.54 times, 0.56 times, 0.58 times, 0.6 times, or 0. The values ​​can be 62 times, 0.64 times, 0.66 times, 0.68 times, 0.7 times, 0.72 times, 0.74 times, 0.76 times, 0.78 times, 0.8 times, 0.82 times, 0.84 times, 0.86 times, 0.88 times, 0.9 times, 0.92 times, 0.94 times, 0.96 times, 0.98 times, or 1 times, but are not limited to the listed values. Other unlisted values ​​within this range also apply.

[0023] In this invention, when multiple spiral distributors are spaced apart, the minimum distance between the spiral distributor and the spoiler group refers to the distance between the spiral distributor and the spoiler group that is adjacent to the spoiler group.

[0024] As a preferred technical solution of the present invention, the distance between the first spoiler and the second spoiler is greater than 0.5 times the equivalent circle diameter of the airflow duct. For example, it can be 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times, 0.75 times, 0.8 times, 0.85 times, 0.9 times, 0.95 times, 1 time, 1.5 times or 2 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0025] Preferably, the distance between the spoiler assembly and the wall of the airflow duct is less than 0.15 times the equivalent circle diameter of the airflow duct. For example, it can be 0.14 times, 0.13 times, 0.12 times, 0.11 times, 0.1 times, 0.09 times, 0.08 times, 0.06 times, 0.05 times, 0.04 times, 0.03 times, 0.02 times, or 0.01 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0026] As a preferred technical solution of the present invention, the spiral distributor includes a planar spiral distributor and / or a conical three-dimensional spiral distributor.

[0027] As a preferred technical solution of the present invention, the equivalent circle diameter of the spiral tube in the spiral distributor is 0.05-0.15 times the equivalent circle diameter of the airflow duct. For example, it can be 0.05 times, 0.055 times, 0.06 times, 0.065 times, 0.07 times, 0.075 times, 0.08 times, 0.085 times, 0.09 times, 0.095 times, 0.1 times, 0.105 times, 0.11 times, 0.115 times, 0.12 times, 0.125 times, 0.13 times, 0.135 times, 0.14 times, 0.145 times, or 0.15 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0028] In this invention, the spiral tube can be a round tube or a round tube of other shapes, such as a square tube, a rhomboid tube, or other tube shapes.

[0029] As a preferred technical solution of the present invention, the spiral distributor has 3-6 spiral rotations, for example, 3, 4, 5 or 6, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0030] In this invention, the spiral circumference refers to one complete spiral movement of the gas pipeline along the circumference of the exhaust gas pipeline.

[0031] Preferably, the number of air holes on a single spiral circumference in the spiral distributor is ≥3, for example, it can be 3, 4, 5 or 6, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0032] Preferably, the equivalent circle diameter of the vent is 0.2-0.4 times the equivalent circle diameter of the gas inlet pipe on the spiral distributor. For example, it can be 0.2 times, 0.21 times, 0.22 times, 0.23 times, 0.24 times, 0.25 times, 0.26 times, 0.27 times, 0.28 times, 0.29 times, 0.3 times, 0.31 times, 0.32 times, 0.33 times, 0.34 times, 0.35 times, 0.36 times, 0.37 times, 0.38 times, 0.39 times, or 0.4 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0033] In this invention, the opening shape of the air hole can be a round hole, a square hole, a rhombus, an elliptical hole, etc. When it is a round hole, the diameter of the circle is directly used. When it is a square hole, a rhombus, an elliptical hole, etc., the shape can be set according to the corresponding circle diameter.

[0034] In this invention, the direction of the opening on the spiral distributor is not limited to along the gas flow direction, but can also be against the gas flow direction or at a certain oblique angle to the gas flow direction.

[0035] As a preferred technical solution of the present invention, the bottom surface of the conical opening structure in the spoiler group is provided with a central hole, and a first hole group and a second hole group are arranged sequentially around the central hole.

[0036] As a preferred technical solution of the present invention, the equivalent circle diameter of the central hole is 0.1-0.3 times the equivalent circle diameter of the airflow duct, for example, it can be 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times, 0.15 times, 0.16 times, 0.17 times, 0.18 times, 0.19 times, 0.2 times, 0.21 times, 0.22 times, 0.23 times, 0.24 times, 0.25 times, 0.26 times, 0.27 times, 0.28 times, 0.29 times, or 0.3 times, etc., but is not limited to the listed values, and other unlisted values ​​within this range are also applicable.

[0037] Preferably, the first hole group has at least 8 holes, such as 8, 9, 10, 12 or 13, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0038] Preferably, the equivalent circle diameter of the holes in the first hole group is 0.1-0.2 times the equivalent circle diameter of the airflow duct, for example, it can be 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times, 0.15 times, 0.16 times, 0.17 times, 0.18 times, 0.19 times or 0.2 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0039] Preferably, the second hole group has at least 8 holes, such as 8, 9, 10, 12 or 13, but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0040] Preferably, the equivalent circle diameter of the holes in the second hole group is 0.1-0.2 times the equivalent circle diameter of the airflow duct, for example, it can be 0.1 times, 0.11 times, 0.12 times, 0.13 times, 0.14 times, 0.15 times, 0.16 times, 0.17 times, 0.18 times, 0.19 times or 0.2 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0041] Preferably, the central angle between the centers of adjacent holes in the first and second hole groups is 20-25°.

[0042] In this invention, the central angle is the angle formed by the center point of the hole in the first hole group and the center point of the hole in the second hole group, with the center of the bottom surface of the conical opening structure as the vertex.

[0043] As a preferred technical solution of the present invention, the equivalent circle diameter of the top opening of the conical opening structure in the spoiler group is 0.15-0.3 times the equivalent circle diameter of the bottom surface of the conical opening structure. For example, it can be 0.15 times, 0.16 times, 0.17 times, 0.18 times, 0.19 times, 0.2 times, 0.21 times, 0.22 times, 0.23 times, 0.24 times, 0.25 times, 0.26 times, 0.27 times, 0.28 times, 0.29 times, or 0.3 times, etc., but is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0044] In a second aspect, the present invention provides an application of the gas mixing device as described in the first aspect, the application including using the gas mixing device to mix coal mine exhaust air and low-concentration methane.

[0045] As a preferred embodiment of the present invention, the low-concentration gas enters the airflow duct through a spiral distributor;

[0046] Preferably, the coal mine exhaust air is supplied through an airflow pipe;

[0047] Preferably, the volume concentration of the low-concentration gas is ≤30%;

[0048] Preferably, the cross-sectional non-uniformity of methane in the gas stream after mixing is <5%.

[0049] In this invention, when using a gas mixing device to mix coal mine exhaust air and low-concentration methane, the mixing ratio of exhaust air and low-concentration methane can be (6-12):1.

[0050] Compared with existing technical solutions, the present invention has the following beneficial effects:

[0051] (1) The gas mixing device provided by the present invention mixes evenly. Low-concentration gas is gradually mixed with exhaust air through a gradually expanding spiral distributor. Since the gas outflow velocity gradually decreases with the length of the spiral ring due to friction resistance, it is consistent with the trend of the center height of exhaust air velocity gradually decreasing radially in the duct, thereby promoting more uniform mixing of exhaust air and gas, so that the cross-sectional non-uniformity after mixing is <5%; and avoiding local gas concentration exceeding the limit.

[0052] (2) The gas mixing device provided by the present invention also has the advantages of low wind resistance, energy saving and consumption reduction, simple structure, easy design, installation, operation adjustment and use replacement; and it can also be used for mixing exhaust air and low concentration gas in a large proportion range, with a wide range of applications. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the gas mixing device in Embodiment 1 of the present invention;

[0054] Figure 2 This is a schematic diagram of the spiral distributor of the gas mixing device along AA in Embodiment 1 of the present invention;

[0055] Figure 3 This is a schematic diagram of the first turbulence diffuser along BB in the gas mixing device of Embodiment 1 of the present invention.

[0056] In the diagram: 1-Gas inlet pipe of spiral distributor, 2-Spiral distributor, 3-First baffle, 4-Second baffle, 5-Airflow pipe, F-Exhaust air, W-Low concentration gas.

[0057] The present invention will now be described in further detail. However, the examples described below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims. Detailed Implementation

[0058] To better illustrate the present invention and facilitate understanding of its technical solutions, typical but non-limiting embodiments of the present invention are as follows:

[0059] Example 1

[0060] This embodiment provides a gas mixing device, such as... Figure 1 As shown, the gas mixing device includes a spiral distributor 2 and a group of turbulent devices arranged sequentially along the airflow direction inside the airflow pipe 5. The airflow pipe 5 is a circular pipe, wherein the airflow pipe 5 is supplied with a gas of relatively low concentration, such as exhaust gas F, and the spiral distributor 2 supplies a gas of relatively high concentration, such as low-concentration methane W.

[0061] At least one spiral distributor 2 is provided; in this embodiment, one is selected.

[0062] The minimum distance between the spiral distributor 2 and the spoiler group is ≥ 0.3 times the diameter of the airflow duct 5; in this embodiment, it is selected as 0.3 times.

[0063] The distance between the spoiler assembly and the wall of the airflow duct 5 is less than 0.15 times the diameter of the airflow duct 5; in this embodiment, it is selected as 0.1 times.

[0064] The bottom surface of the conical opening structure of the spoiler group near the spiral distributor 2 faces the spiral distributor 2;

[0065] The spiral distributor 2 can take the form of a planar spiral distributor and / or a conical three-dimensional spiral distributor. In this embodiment, a planar spiral distributor is selected, such as... Figure 2 As shown.

[0066] The diameter of the spiral tube in the spiral distributor 2 is 0.05-0.15 times the diameter of the airflow pipe 5. In this embodiment, it is selected as 0.1 times. The spiral tube is a circular tube. At this time, the spiral distributor 2 and the gas inlet pipe 1 are designed as an integral unit. The spiral distributor 2 has 4 spiral circumferences. The spiral distributor 2 has 3 air holes on a single spiral circumference. The diameter of the air hole is 0.2 times the diameter of the spiral tube. The air hole is a circular air hole.

[0067] The spoiler group includes a first spoiler 3 and a second spoiler 4 arranged symmetrically; the distance between the first spoiler 3 and the second spoiler 4 is greater than 0.5 times the diameter of the airflow duct 5, and in this embodiment, it is selected as 1 time.

[0068] The bottom surface of the conical opening structure (a frustum structure) in the spoiler group has a central hole (circular hole), and a first hole group and a second hole group are arranged sequentially around the central hole, such as... Figure 3 As shown; the diameter of the central hole is 0.2 times the diameter of the airflow pipe 5; the first hole group has 8 holes (circular holes); the diameter of the holes in the first hole group is 0.15 times the diameter of the airflow pipe 5; the second hole group has 8 holes (circular holes); the diameter of the holes in the second hole group is 0.15 times the diameter of the airflow pipe 5; the central angle between the centers of adjacent holes in the first hole group and the second hole group is 22.55°;

[0069] The diameter of the top opening of the conical perforation structure in the spoiler group is 0.15 times the diameter of the bottom surface of the conical perforation structure.

[0070] Example 2

[0071] This embodiment provides a gas mixing device, which includes a spiral distributor 2 and a group of turbulent devices arranged sequentially along the airflow direction in an airflow pipe 5, and the airflow channel is a circular pipe; wherein the airflow pipe 5 is supplied with a gas of relatively low concentration, such as exhaust gas F, and the spiral distributor 2 supplies a gas of relatively high concentration, such as low-concentration methane W.

[0072] At least one spiral distributor 2 is provided; in this embodiment, two are selected and the spacing is twice the diameter of the gas inlet pipe 1 of the spiral distributor 2. At this time, the spiral distributor 2 and the gas inlet pipe 1 are designed as a whole and are circular pipes.

[0073] The minimum distance between the spiral distributor 2 and the spoiler group is ≥ 0.3 times the diameter of the airflow duct 5; in this embodiment, it is selected as 0.5 times.

[0074] The distance between the spoiler assembly and the wall of the airflow duct 5 is less than 0.15 times the diameter of the airflow duct 5; in this embodiment, it is selected as 0.05 times.

[0075] The bottom surface of the conical opening structure of the spoiler group near the spiral distributor 2 faces the spiral distributor 2;

[0076] The spiral distributor 2 can take the form of a planar spiral distributor and / or a conical three-dimensional spiral distributor. In this embodiment, a conical three-dimensional spiral distributor is selected, and the cone extends from the apex along the airflow direction.

[0077] The diameter of the spiral tube in the spiral distributor 2 is 0.05-0.15 times the diameter of the airflow pipe 5, and in this embodiment, it is selected as 0.05 times; the spiral distributor 2 has 3 spiral circumferences; the spiral distributor 2 has 4 air holes on a single spiral circumference; the equivalent circle diameter of the air hole is 0.5 times the diameter of the spiral tube, and the air hole is a square hole;

[0078] The spoiler group includes a first spoiler 3 and a second spoiler 4 arranged symmetrically; the distance between the first spoiler 3 and the second spoiler 4 is greater than 0.5 times the diameter of the airflow duct 5, and in this embodiment, it is selected as 0.75 times.

[0079] The bottom surface of the conical opening structure (a frustum structure) in the spoiler group has a central hole (square hole), and a first hole group and a second hole group are arranged sequentially around the central hole; the equivalent circular diameter of the central hole is 0.1 times the diameter of the airflow duct 5; the first hole group has 10 holes (circular holes); the diameter of the holes in the first hole group is 0.1 times the diameter of the airflow duct 5; the second hole group has 12 holes (circular holes); the diameter of the holes in the second hole group is 0.2 times the diameter of the airflow duct 5; the central angle between the centers of adjacent holes in the first hole group and the second hole group is 20°;

[0080] The diameter of the top opening of the conical perforation structure in the spoiler group is 0.3 times the diameter of the bottom surface of the conical perforation structure.

[0081] Example 3

[0082] This embodiment provides a gas mixing device, which includes a spiral distributor 2 and a group of turbulent devices arranged sequentially along the airflow direction in an airflow pipe 5; the airflow pipe 5 is a circular pipe, wherein the airflow pipe 5 is supplied with a gas of relatively low concentration, such as exhaust gas F, and the spiral distributor 2 supplies a gas of relatively high concentration, such as low-concentration methane W.

[0083] At least one spiral distributor 2 is provided; in this embodiment, one is selected, and the spiral tube is a circular tube. In this case, the spiral distributor 2 and the gas inlet pipe 1 are designed as an integrated unit.

[0084] The minimum distance between the spiral distributor 2 and the spoiler group is ≥ 0.3 times the diameter of the airflow duct 5; in this embodiment, it is selected as 1 time.

[0085] The distance between the spoiler assembly and the wall of the airflow duct 5 is less than 0.15 times the diameter of the airflow duct 5; in this embodiment, it is selected as 0.075 times.

[0086] The bottom surface of the conical opening structure of the spoiler group near the spiral distributor 2 faces the spiral distributor 2;

[0087] The spiral distributor 2 can take the form of a planar spiral distributor and / or a conical three-dimensional spiral distributor. In this embodiment, a planar spiral distributor is selected.

[0088] The diameter of the spiral tube in the spiral distributor 2 is 0.05-0.15 times the diameter of the airflow pipe 5, and in this embodiment, it is selected as 0.15 times; the spiral distributor 2 has 6 spiral circumferences; the spiral distributor 2 has 6 air holes on a single spiral circumference; the equivalent circle diameter of the air hole is 0.4 times the diameter of the spiral tube, and the air hole is a regular pentagonal hole;

[0089] The spoiler group includes a first spoiler 3 and a second spoiler 4 arranged symmetrically; the distance between the first spoiler 3 and the second spoiler 4 is greater than 0.5 times the diameter of the airflow duct 5, and in this embodiment, it is selected as 1.5 times.

[0090] The bottom surface of the conical opening structure (a frustum structure) in the spoiler group has a central hole (circular hole), and a first hole group and a second hole group are arranged sequentially around the central hole; the diameter of the central hole is 0.3 times the diameter of the airflow duct 5; the first hole group has 8 holes (circular holes); the diameter of the holes in the first hole group is 0.2 times the diameter of the airflow duct 5; the second hole group has 8 holes (circular holes); the diameter of the holes in the second hole group is 0.1 times the diameter of the airflow duct 5; the central angle between the centers of adjacent holes in the first hole group and the second hole group is 25°;

[0091] The diameter of the top opening of the conical perforation structure in the spoiler group is 0.2 times the diameter of the bottom surface of the conical perforation structure.

[0092] Comparative Example 1

[0093] The only difference from Example 1 is that the spiral distributor is not provided.

[0094] Comparative Example 2

[0095] The only difference from Embodiment 1 is that a second spoiler is not provided.

[0096] Comparative Example 3

[0097] The only difference from Embodiment 1 is that the first spoiler is not provided.

[0098] Comparative Example 4

[0099] The only difference from Embodiment 1 is that the spiral distributor is placed between the first and second spoilers. In this process, only the position is moved, and other related parameters and orientations remain unchanged.

[0100] Application Example 1

[0101] The gas mixing devices of Examples 1-3 and Comparative Examples 1-4 were used to mix coal mine exhaust gas and low-concentration methane. The low-concentration methane entered the gas flow pipe through a spiral distributor, and the coal mine exhaust gas was supplied through the gas flow pipe. The gas parameters and result indicators controlled during the mixing are detailed in Table 1.

[0102] Table 1

[0103]

[0104] As can be seen from the results of the above embodiments and comparative examples, the gas mixing device provided by the present invention, by designing the gas mixing device and adopting a specific spiral distributor combined with a flow disruptor group setting method, achieves efficient mixing of exhaust gas and methane gas, improves the uniformity of methane in the mixed gas, and reduces the non-uniformity to below 5%.

[0105] The present invention is described in detail through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions for the components used in the present invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0106] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0107] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0108] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A gas mixing device, characterized in that, The gas mixing device includes: a spiral distributor and a group of flow disruptors arranged sequentially along the airflow direction inside the airflow duct; At least one spiral distributor shall be provided; The spoiler group includes a first spoiler and a second spoiler arranged symmetrically. The minimum distance between the spiral distributor and the spoiler group is ≥ 0.3 times the equivalent circle diameter of the airflow duct; The direction of the opening on the spiral distributor includes any one of the following: along the gas flow direction, against the gas flow direction, or at a certain oblique angle to the gas flow direction; The bottom surface of the conical opening structure of the spoiler group near the spiral distributor faces the spiral distributor; The bottom surface of the conical opening structure in the spoiler group is provided with a central hole, and a first hole group and a second hole group are arranged in sequence around the central hole. The distance between the first and second spoilers is greater than 0.5 times the equivalent circle diameter of the airflow duct; The distance between the spoiler assembly and the wall of the airflow duct is less than 0.15 times the equivalent circle diameter of the airflow duct.

2. The gas mixing device as described in claim 1, characterized in that, The spiral distributor can take the form of a planar spiral distributor and / or a conical three-dimensional spiral distributor.

3. The gas mixing device as described in claim 1, characterized in that, The equivalent circle diameter of the spiral tube in the spiral distributor is 0.05-0.15 times the equivalent circle diameter of the airflow duct.

4. The gas mixing device as described in claim 1, characterized in that, The spiral distributor has 3-6 spiral rotations.

5. The gas mixing device as described in claim 1, characterized in that, The spiral distributor has ≥3 air holes on a single spiral circumference.

6. The gas mixing device as described in claim 5, characterized in that, The equivalent circle diameter of the vent is 0.2-0.4 times the equivalent circle diameter of the gas inlet pipe on the spiral distributor.

7. The gas mixing device as described in claim 1, characterized in that, The equivalent circle diameter of the central hole is 0.1-0.3 times the equivalent circle diameter of the airflow duct.

8. The gas mixing device as described in claim 1, characterized in that, The first hole group has at least 8 holes.

9. The gas mixing device as described in claim 1, characterized in that, The equivalent circle diameter of the holes in the first hole group is 0.1-0.2 times the equivalent circle diameter of the airflow duct.

10. The gas mixing apparatus as claimed in claim 1, characterized in that, The second hole group shall have at least 8 holes.

11. The gas mixing apparatus as claimed in claim 1, characterized in that, The equivalent circle diameter of the holes in the second hole group is 0.1-0.2 times the equivalent circle diameter of the airflow duct.

12. The gas mixing apparatus as claimed in claim 1, characterized in that, The central angle between the centers of adjacent holes in the first and second hole groups is 20-25°.

13. The gas mixing device as claimed in claim 1, characterized in that, The equivalent circle diameter of the top opening of the conical perforation structure in the spoiler group is 0.15-0.3 times the equivalent circle diameter of the bottom surface of the conical perforation structure.

14. Use of a gas mixing apparatus as described in any one of claims 1-13, characterized in that, The applications include using a gas mixing device to mix coal mine exhaust air and low-concentration methane.

15. The use as described in claim 14, characterized in that, The low-concentration gas enters the airflow duct through a spiral distributor.

16. The use as described in claim 14, characterized in that, The coal mine exhaust air is supplied through an airflow pipe.

17. The use as described in claim 14, characterized in that, The volume concentration of the low-concentration gas is ≤30%.

18. The use as described in claim 14, characterized in that, The cross-sectional non-uniformity of methane in the gas stream after mixing is <5%.

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