Tracer agent mixing and uniform distribution device

Abstract

The utility model provides a tracer agent mixing and uniform distribution device, and relates to the technical field of ventilation detection systems, the tracer agent mixing and uniform distribution device comprises an air pipe, an air distributor and an injection pipe, an air duct is arranged in the air pipe, and the air distributor is transversely arranged in the air duct along the radial direction of the air pipe; at least one air distribution channel is arranged in the air distributor, a plurality of air distribution holes communicated with the air distribution channel are distributed in the wall face, facing the downstream of the flowing direction of air in the air channel, of the air distributor, and the distribution of the air distribution holes meets the requirement that when the tracer agent is injected into the whole air pipe, the concentration of the tracer agent in the section range of the air pipe is evenly distributed. One end of the injection pipe is communicated to each air distribution channel of the air distributor, and the other end of the injection pipe is communicated to the tracer agent supply device so as to inject a gas medium containing a tracer agent into the air distribution channels. According to the invention, the gas medium containing the tracer agent is uniformly distributed into the air duct in a multi-point injection manner through the air distributor, and is mixed with the airflow in the air duct, so that the short-distance sufficient mixing and uniform distribution of the tracer agent in the air duct are realized, and the deviation of a detection result is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of ventilation detection systems, and in particular to a tracer mixing and uniform distribution device. Background Art

[0002] When performing air exchange rate tests in closed areas, unfiltered air leakage detection in the habitable area of ​​the main control room of a nuclear power plant, and fresh air volume detection in underground tunnels, the tracer concentration dilution method is usually used for detection. A prerequisite for this detection method is that the tracer in the main pipeline can be fully diffused after injection, and the concentration of the tracer in the gas medium must be consistent before reaching the branch pipeline to achieve uniform mixing. Without external force assistance, the tracer in the main air duct relies on natural diffusion from the injection end to the position where it is fully and evenly mixed. In actual engineering applications, due to site space limitations or other special reasons, the distance from the main air duct tracer injection port to the branch pipeline is very short. When the superimposed air flow velocity is large, it is difficult for the tracer to achieve full and uniform mixing before reaching the branch pipeline, which will cause a large measurement deviation in the detection. Utility Model Content

[0003] The present application provides a tracer mixing and uniform distribution device, which is used to solve the problem in the engineering detection process, especially when the distance between the tracer injection point of the main air duct and the branch air duct is close, the tracer cannot be fully mixed and the concentration is uniform in the airflow before reaching the branch air duct, resulting in a large deviation in the detection result. The tracer mixing and uniform distribution device provided by the present application evenly distributes the gas containing the tracer into the air duct in a multi-point injection manner through the air distribution holes on the air distributor, and mixes it with the airflow in the air duct, thereby achieving short-distance full mixing and uniform distribution of the tracer in the air duct, ensuring that the tracer concentration is uniform before reaching the branch pipeline of the air duct, and avoiding deviations in the detection results.

[0004] The present application provides a tracer mixing and uniform distribution device, which includes an air duct, an air distributor, and an injection pipe, wherein the air duct is provided with an air duct extending along its axial direction for gas flow; the air distributor is horizontally placed in the air duct along the radial direction of the air duct; the air distributor is provided with at least one air distribution channel, and the air distributor is provided with a plurality of air distribution holes distributed along the air distribution channel and connected with the air distribution channel on the wall surface of the air distributor facing the downstream of the gas flow direction in the air duct, and the arrangement of the air distribution holes satisfies: when the tracer is injected into the entire air duct, the tracer concentration is uniformly distributed within its cross-sectional range; one end of the injection pipe is connected to each air distribution channel of the air distributor, and the other end is connected to the tracer supply device, so as to inject the gas medium containing the tracer into the air distribution channel.

[0005] In some embodiments, the air distribution holes are arranged in a spiral pattern, a concentric circular pattern, a radial pattern, a matrix pattern, or a radial linear pattern centered on the axis of the air duct within the cross-section of the air pipe;

[0006] Or / and, the spacing between the air distribution holes on the same air distribution channel is the same or gradually decreases or increases in proportion;

[0007] Or / and, the spacing between the air distribution holes on adjacent air distribution channels is the same or gradually decreases or increases in proportion.

[0008] In some embodiments, the outer peripheral dimension of the air distributor matches the inner diameter dimension of the air pipe; or the outer peripheral dimension of the air distributor is smaller than the inner diameter dimension of the air pipe;

[0009] Or / and, a number of ventilation holes spaced from the air distribution channels are axially penetrated through the air distributor, and the gas in the air duct flows from upstream to downstream through the ventilation holes.

[0010] In some embodiments, the air distribution channels are arranged in a circular or spiral pattern around the axis of the air duct.

[0011] In some embodiments, the air distributor includes at least one spiral tube, which is spirally wound around the axis of the air duct; the inner cavity of the spiral tube constitutes the air distribution channel, and the air distribution holes are provided on the tube wall of the spiral tube.

[0012] In some embodiments, one end of the spiral tube close to the axis of the air duct is connected to the injection tube, and the other end close to the inner wall of the air pipe is a closed end.

[0013] In some embodiments, the air distributor includes at least one annular tube, and a plurality of the annular tubes are concentrically arranged around the axis of the air duct; the inner cavity of the annular tube constitutes the air distribution channel, and the air distribution holes are provided on the tube wall of the annular tube.

[0014] In some embodiments, the spacing of the air distribution holes in the radial direction of the air pipe gradually decreases.

[0015] In some embodiments, an air flow mixing component is further included, and the air flow mixing component is horizontally arranged in the air duct along the radial direction of the air pipe and is on the side of the air distributor with the air distribution holes, so as to mix the gas medium ejected through the air distribution holes with the air flow in the air duct by rotation.

[0016] In some embodiments, the air flow mixing component includes an impeller, the impeller is rotatably connected in the air pipe, and the windward surface of the impeller at least covers the air distribution range of the air distribution holes.

[0017] In some embodiments, the air distributor includes at least one straight pipe that extends linearly along the radial direction of the air duct.

[0018] The tracer mixing and uniform distribution device provided by the present application realizes the directional transportation of the total pipeline air flow through the air duct. There is an air channel in the air duct. The air distributor is horizontally arranged in the air channel along the radial direction of the air duct. A number of air distribution holes are arranged on the wall surface of the air distributor facing the downstream of the gas flow direction in the air channel, and the arrangement of the air distribution holes satisfies that when the tracer is injected into the entire air duct, the tracer concentration is evenly distributed within its cross-sectional range, so that the air distribution holes are distributed within the cross-section of the air duct and face the downstream of the gas flow direction.

[0019] The device of the present application is connected to the tracer supply device and the air distributor through the injection pipe. Through the air distribution holes distributed on the air distributor, the gas medium containing the tracer is evenly distributed into the air channel in a multi-point injection manner and mixed with the air flow in the air channel, so that when the tracer is injected into the entire air duct, the tracer concentration is evenly distributed within its cross-sectional range, realizing the short-distance full mixing and uniform distribution of the tracer in the air channel, ensuring that the tracer concentration is uniform before reaching the branch pipeline of the air channel, avoiding the deviation in the detection results, meeting the detection accuracy requirements for detection work such as measuring the air exchange rate of a closed area by the tracer concentration dilution method, detecting the internal leakage of non-filtered air in the main control room, and measuring the fresh air volume of an underground tunnel, and being applicable to various air duct layout types, air flow channels, and air flow linear velocity distribution situations. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where:

[0021] Figure 1 It is a schematic diagram of the overall structure of the device of the present application assembled with the tracer supply device and the mixing detection device. The device of the present application includes an air duct, an air distributor, an injection pipe, and an air flow mixing component;

[0022] Figure 2 It is a schematic diagram of the structure of one embodiment of the device of the present application, including an air duct, an air distributor, an injection pipe, and an air flow mixing component, where the air distributor includes a spiral pipe and the air flow mixing component includes an impeller;

[0023] Figure 3 It is a schematic diagram of the structure of one embodiment of the device of the present application, including an air duct, an air distributor, an injection pipe, and an air flow mixing component, where the air distributor includes three concentric annular pipes and the air flow mixing component includes an impeller. Detailed Embodiments

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. According to the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment, and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0025] Unless otherwise specified, the "connection" mentioned in the present application includes direct connection, indirect connection, fixed connection and movable connection. In addition, the orientation or positional relationship indicated by "front", "rear", "left", "right", "length direction", "axial direction", "radial direction", "end", "side", "inside", "outside", etc. in the present application is the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not limit the technical solutions of the present application.

[0026] Please refer to Figure 1 , the present application provides a tracer mixing and uniform distribution device, which includes an air duct 1, a air distributor 2, and an injection pipe 3. An air duct 11 for gas flow is provided in the air duct 1 and extends along its axial direction (i.e., along the length direction of the air duct 1). An air inlet 12 and an air outlet 13 are respectively arranged at the front and rear ends of the air duct 1.

[0027] The air distributor 2 is horizontally arranged in the air duct 11 along the radial direction of the air duct 1, preferably close to the upstream of the gas flow direction in the air duct 11 (i.e., close to the air inlet 12). At least one air distribution channel (not shown in the figure) is provided in the air distributor 2. A number of air distribution holes 20 are arranged on the wall surface of the air distributor 2 facing the downstream of the gas flow direction in the air duct 11 (i.e., the wall surface facing the air outlet 13), and are distributed along the air distribution channel and communicated with the air distribution channel. The arrangement of the air distribution holes 20 satisfies that when the tracer is injected into the entire air duct 1, the concentration of the tracer is evenly distributed within the cross-section of the air duct 1.

[0028] One end of the injection pipe 3 extends into the air duct 1 and is communicated with each air distribution channel of the air distributor 2. The other end of the injection pipe 3 extends out of the air duct 1 and is communicated with a tracer supply device 5 to inject a gas medium containing a tracer into the air distribution channel. The injection pipe 3 is preferably fixedly connected to the air duct 1 to limit and fix the air distributor 2 in the air duct 1 as a support and fixing structure.

[0029] The tracer supply device 5 includes a tracer storage tank 51, which is a pressure vessel. The outlet end of the tracer storage tank 51 is connected to the injection pipe 3 through a pressure reducing valve 52. In order to facilitate the measurement of the tracer output, a flow meter 53 is also connected to the injection pipe 3. The tracer storage tank 51 stores a gas medium containing a tracer. The gas medium is decompressed by the pressure reducing valve 52 and enters the air distribution channel of the air distributor 2 through the injection pipe 3 at a certain pressure, and finally is distributed into the air duct 11 through the air distribution holes 20 and mixed with the air flow in the air duct 11.

[0030] The tracer mixing and uniform distribution device provided by this application realizes the directional transportation of the total pipeline air flow through the air duct 1. There is an air duct 11 inside the air duct 1. The air distributor 2 is horizontally arranged in the air duct 11 along the radial direction of the air duct 1. A number of air distribution holes 20 are distributed on the wall surface of the air distributor 2 facing the downstream of the gas flow direction in the air duct 11, and the arrangement of the air distribution holes 20 satisfies: when the tracer is injected into the entire air duct 1, the tracer concentration is uniformly distributed within its cross-sectional range, so that the air distribution holes 20 are distributed on the cross-section of the air duct 1 and face the downstream of the gas flow direction.

[0031] The device of this application connects the tracer supply device 5 and the air distributor 2 through the injection pipe 3. Through the air distribution holes 20 arranged in a dot matrix on the air distributor 2, the gas medium containing the tracer is evenly distributed into the air duct 11 in a multi-point injection manner and mixed with the air flow in the air duct 11, so that when the tracer is injected into the entire air duct 1, the tracer concentration is uniformly distributed within its cross-sectional range, realizing the short-distance full mixing and uniform distribution of the tracer in the air duct 11, ensuring that the tracer concentration is uniform before reaching the branch pipeline of the air duct 11, avoiding the deviation in the detection results, meeting the detection accuracy requirements of detection work such as measuring the air exchange rate of a closed area by the tracer concentration dilution method, detecting the internal leakage of non-filtered air in the main control room, and measuring the fresh air volume of the underground tunnel, and being applicable to various air duct layout types, air flow channels and air flow linear velocity distribution situations.

[0032] In the following embodiments, the air duct 1 is taken as a circular pipe for illustration, but it is not a limitation on the protection scope of this application. It can be understood that in some other embodiments, the air duct 1 can also be set as a square pipe or a special-shaped pipe. This application does not make any limitations in this regard. The specific shape, structure, etc. of the air duct 1 can be set accordingly according to the actual situation to meet the actual use requirements.

[0033] In some embodiments, the air distribution holes 20 are arranged in a spiral pattern or a concentric circular pattern or a radial pattern or a matrix pattern or a radial straight-line pattern within the cross-sectional range of the air duct 1 with the axis 10 of the air duct 1 as the center;

[0034] Or / and, the distance between the air distribution holes 20 on the same air distribution channel is the same or gradually decreases or increases in proportion;

[0035] Alternatively, and / or, the spacing between the air distribution holes 20 in adjacent air distribution channels is the same or gradually decreases or increases proportionally.

[0036] Understandably, for the air distributor 2 of the device in this application, the air distribution holes 20 can have various arrangement forms. For example, they can be arranged in a spiral pattern centered on the axis 10 of the air duct 11 within the cross-sectional range of the air pipe 1; they can also be arranged in a concentric circular pattern centered on the axis 10 of the air duct 11 within the cross-sectional range of the air pipe 1; they can also be arranged in a radial pattern centered on the axis 10 of the air duct 11 within the cross-sectional range of the air pipe 1; they can also be arranged in a matrix pattern centered on the axis 10 of the air duct 11 within the cross-sectional range of the air pipe 1; they can also be arranged in a radial straight-line pattern centered on the axis 10 of the air duct 11 within the cross-sectional range of the air pipe 1.

[0037] Understandably, for the air distributor 2 of the device in this application, the spacing between the air distribution holes 20 in the same air distribution channel can be the same, or can gradually decrease or increase proportionally.

[0038] Understandably, for the air distributor 2 of the device in this application, the spacing between the air distribution holes 20 in adjacent air distribution channels can be the same, or can gradually decrease or increase proportionally.

[0039] For the air distributor 2 of the device in this application, the arrangement of the air distribution holes 20 enables the gas medium containing the tracer to be injected into the air pipe 1 simultaneously in a multi-point and multi-region manner within the cross-sectional range of the air pipe 1, achieving rapid mixing and uniform distribution of the tracer in a short distance within the air pipe. Moreover, with the change in the arrangement of the air distribution holes 20, the momentum of the gas medium ejected outward from the air distribution holes 20 can also be appropriately changed, thereby adjusting the mixing rate of the tracer and the air flow in the air duct 11.

[0040] In some embodiments, the outer peripheral dimension of the air distributor 2 matches the inner diameter dimension of the air pipe 1, so that the air distributor 2 can fit radially into the inner cavity of the air pipe 1. A gap can be left or not left between the outer periphery of the air distributor 2 and the inner wall of the air pipe 1. When the air pipe 1 is a circular pipe, the air distributor 2 can be arranged as a circular structure that completely fits the inner wall of the air pipe 1, so that no gap is left between the outer periphery of the air distributor 2 and the inner wall of the air pipe 1.

[0041] When there is no gap between the outer periphery of the air distributor 2 and the inner wall of the air duct 1, in order to ensure the normal flow of the gas in the air duct 1 from the air inlet 12 to the air outlet 13, correspondingly, a number of ventilation hole positions (not marked) spaced from the air distribution channel are axially penetrated through the air distributor 2, so that the gas in the air duct 11 can flow from upstream to downstream through the ventilation hole positions provided on the air distributor 2. In this way, the overall shape of the air distributor 2 can be set to be substantially the same as the shape of the cross-section of the air duct 1, and the air distribution holes 20 can be distributed in an almost equal-area manner across the entire cross-section of the air duct 11, and can evenly distribute the gas medium containing the tracer to the maximum extent into the air duct 11 and mix with the air flow in the air duct 11, further improving the efficiency and uniformity of the tracer mixing and distribution.

[0042] Alternatively, the air distributor 2 can also be set as a regular or irregular polygonal structure, special-shaped structure, etc. inscribed in the inner cavity of the air duct 1, so that there is a gap between the outer periphery of the air distributor 2 and the inner wall of the air duct 1. The gas in the air duct 11 can flow from upstream to downstream through the gap between the air distributor 2 and the air duct 1, and the air distributor 2 will not affect the normal flow of the air flow in the air duct 1. At this time, there is no need to set ventilation hole positions on the air distributor 2.

[0043] When the outer peripheral dimension of the air distributor 2 matches the inner diameter dimension of the air duct 1, the air distributor 2 can be limited and fixed by the inner wall of the air duct 1, and there is no need to fixedly connect the air distributor 2 and the air duct 1 through the injection pipe 3.

[0044] It can be understood that in some other embodiments, the outer peripheral dimension of the air distributor 2 can also be set to be smaller than the inner diameter dimension of the air duct 1, so as to leave a certain gap between the outer periphery of the air distributor 2 and the inner wall of the air duct 1, and the gas in the air duct 11 can flow from upstream to downstream through the gap between the air distributor 2 and the air duct 1. When the outer peripheral dimension of the air distributor 2 is set to be smaller than the inner diameter dimension of the air duct 1, the overall shape of the air distributor 2 can be different from the shape of the cross-section of the air duct 1. For example, when the air duct 1 is a circular pipe, the air distributor 2 can be set as a regular or irregular polygon or special-shaped structure with a slightly smaller size.

[0045] Of course, when the outer peripheral dimension of the air distributor 2 is set to be smaller than the inner diameter of the air duct 1, ventilation hole positions can still be axially penetrated through the air distributor 2 to ensure that there is sufficient air flow in the air duct 1 from upstream to downstream.

[0046] As a further improved technical solution of the device of the present application, in some embodiments, the air distribution channels in the air distributor 2 can be arranged to surround or coil around the axis of the air duct 11.

[0047] When the air distribution channel is arranged to surround or coil around the axis 10 of the air duct 11, it can guide the gas medium containing the tracer to flow circularly or spirally in the air distributor 2 through the air distribution channels arranged in a surrounding or coiled manner, promote the gas medium to be ejected into the air duct 11 through each air distribution hole 20, increase the ejection momentum of the gas medium, and further promote the full mixing and uniform distribution of the tracer with the air flow in the air duct 11.

[0048] Please refer to Figure 2 , in some embodiments, the air distributor 2 includes at least one spiral tube 21, and the spiral tube 21 is spirally coiled around the axis 10 of the air duct 11. The inner cavity of the spiral tube 21 forms the air distribution channel, and the air distribution holes 20 are arranged on the tube wall of the spiral tube 21.

[0049] The air distributor 2 in this embodiment is described by taking the single spiral tube 21 coiled at unequal intervals as an example, and a group of air distribution holes 20 are provided, which are arranged along the spiral of the single spiral tube 21. This implementation manner is not a limitation to the present application.

[0050] It can be understood that the spiral tube 21 is a tubular structure spirally coiled, and it can be coiled by a circular tube or a square tube; at the same time, the spiral tube 21 can be either closely coiled without gaps between the tubes or coiled at equal or unequal intervals with gaps between the tubes; in addition, the spiral tube 21 can be arranged to be coiled left-handed or right-handed; on each spiral tube 21, a group of air distribution holes 20 arranged along its spiral can be opened, or multiple groups of air distribution holes 20 parallel to its spiral can be opened simultaneously. The present application does not limit this, as long as the inner cavity of the spiral tube 21 can be spirally coiled around the axis 10 of the air duct 11 and form the air distribution channel of the air distributor 2.

[0051] The inner end of the spiral tube 21 close to the axis 10 of the air duct 11 is connected to the injection pipe 3, and the outer end of the spiral tube 21 close to the inner wall of the air pipe 1 is a closed end. In this way, the gas medium containing the tracer introduced through the injection pipe 3 flows spirally from the inside to the outside along the inner cavity of the spiral tube 21, and is sequentially discharged from each air distribution hole 20 during the spiral flow process, and then mixes with the air flow in the air duct 11, realizing the rapid and uniform mixing and distribution of the tracer in the air pipe 1.

[0052] The device of the present application uses the spiral tube 21 as the air distributor 2, so that the air distribution channel can be spirally coiled around the axis 10 of the air duct 11, can guide the gas medium containing the tracer to flow spirally in the air distributor 2, promote the gas medium to be ejected into the air duct 11 through each air distribution hole 20, and further promote the full mixing and uniform distribution of the tracer with the air flow in the air duct 11.

[0053] Understandably, when the spiral tube 21 of the air distributor 2 adopts a tightly coiled structure with no gap between tubes, the outer peripheral dimension of the spiral tube 21 can be set slightly smaller than the inner diameter dimension of the air duct 1, so as to leave a certain gap between the air distributor 2 and the inner wall of the air duct 1, ensuring that the air flow in the air duct 11 can flow from upstream to downstream through the formed gap.

[0054] Understandably, when the spiral tube 21 of the air distributor 2 adopts an equally spaced coiled structure or a non-equally spaced coiled structure with gaps between tubes, the gaps between the tube walls of the spiral tube 21 constitute ventilation hole positions spaced from the air distribution channel, and the gas in the air duct 11 can flow from upstream to downstream through these gaps between the tube walls. Thus, the outer peripheral dimension of the spiral tube 21 can be set to match the inner diameter dimension of the air duct 1, so as to increase the distribution area of the air distribution holes 20 in the air duct 11 and expand the air distribution range of the air distribution holes 20.

[0055] Preferably, the air distribution holes 20 are evenly distributed at equal intervals along the coiling direction of the spiral tube 21. In this way, the gas medium containing the tracer in the air distribution channel can be evenly distributed into the air duct 11 by the air distribution holes 20, which can further promote the full mixing and even distribution of the tracer and the air flow in the air duct 11.

[0056] In some embodiments, the spacing between the air distribution holes 20 on the air distribution channel of the same spiral tube 21 is the same or gradually decreases or increases in proportion. For example, the air distribution holes 20 on the same spiral tube 21 can be arranged at equal intervals along the spiral direction of the spiral tube 21, or can be arranged to gradually approach or move relatively away from each other along the spiral direction of the spiral tube 21 in proportion.

[0057] In addition, the air distribution holes 20 on the same spiral tube 21 can also be arranged at equal intervals along the radial direction of the cross-section of the air duct 1, or can be arranged to gradually approach or move relatively away from each other along the radial direction of the cross-section of the air duct 1 in proportion.

[0058] Understandably, when the air distributor 2 has multiple spiral tubes 21 at the same time, the spiral tubes 21 can be spirally coiled around the axis 10 of the air duct 11 with or without gaps between them. At this time, between the air distribution holes 20 on the air distribution channels of adjacent spiral tubes 21, they can be arranged at equal intervals along the radial direction of the cross-section of the air duct 1, or can be arranged to gradually approach or move relatively away from each other along the radial direction of the cross-section of the air duct 1 in proportion.

[0059] Please refer to Figure 2 , further, the spacing of the air distribution holes 20 of the spiral tube 21 gradually decreases in the radial direction of the air duct 1, so that the opening mode of the air distribution holes 20 is that the opening spacing gradually decreases from the center to the outer circle.

[0060] When the tracer supply device 5 injects a gas medium containing a tracer into the air distribution channel of the air distributor 2 through the injection pipe 3, a certain air pressure is generated inside the spiral pipe 21. The opening method of the air distribution holes 20 with the opening spacing gradually decreasing from the center to the outer circle can achieve the purpose of initially uniformly distributing the tracer concentration within the cross-sectional range of the entire air duct 1 during tracer injection.

[0061] To achieve the opening method of the air distribution holes 20 with the opening spacing gradually decreasing from the center to the outer circle, the spiral pipe 21 can be arranged to be coiled in a way that the spacing between the pipe walls gradually decreases, so that the air distribution holes 20 evenly distributed along the air distribution channel can form an opening method with the opening spacing gradually decreasing from the center to the outer circle according to the coiling path of the spiral pipe 21.

[0062] Please refer to Figure 3 , in some embodiments, the air distributor 2 includes at least one annular pipe 22, and a plurality of annular pipes 22 are concentrically surrounded with the axis 10 of the air duct 11 as the center. The inner cavity of the annular pipe 22 constitutes the air distribution channel, and the air distribution holes 20 are arranged on the pipe wall of the annular pipe 22.

[0063] In this embodiment, the air distributor 2 is described by taking three spaced concentric annular pipes 22 with non-uniform spacing as an example. A group of air distribution holes 20 is arranged on each annular pipe 22, and they are arranged along the circular line of the corresponding annular pipe 22. This implementation mode is not a limitation to this application.

[0064] It can be understood that the annular pipe 22 is an annular tubular structure, which can be surrounded by a circular pipe or a square pipe; at the same time, the annular pipe 22 can be circularly surrounded or non-circularly surrounded; in addition, the air distributor 2 can be provided with only one annular pipe 22 or multiple concentric annular pipes 22 at the same time; when the air distributor 2 includes multiple concentric annular pipes 22 at the same time, the adjacent annular pipes 22 can be in close contact without a gap or can be spaced apart with a gap, and the spacing between the adjacent annular pipes 22 can be the same or different, and the shapes, pipe diameters, etc. of the respective annular pipes 22 can be the same or different; one circle of air distribution holes 20 can be opened on each annular pipe 22, or multiple circles of air distribution holes 20 can be opened at the same time. This application does not make any limitations on this, as long as the inner cavity of the annular pipe 22 can be surrounded with the axis 10 of the air duct 11 as the center and constitute the air distribution channel of the air distributor 2.

[0065] The part of the injection pipe 3 extending into the air duct 1 can be connected and communicated with each annular pipe 22 in a single-point or multi-point fixed manner along the radial direction, and can serve as a support and fixing structure for the annular pipe 22 to limit and fix one or more annular pipes 22 in the air duct 1. The gas medium containing the tracer introduced through the injection pipe 3 flows annularly along the inner cavities of the respective annular pipes 22, and sequentially sprays out from the air distribution holes 20 on each annular pipe 22 during the annular flow process, and then mixes with the air flow in the air duct 11, realizing the rapid and uniform mixing and distribution of the tracer in the air duct 1.

[0066] It can be understood that the more the number of the annular pipes 22 is set, the more the number of the air distribution channels is, the larger the air distribution range of the air distribution holes 20 in the air duct 11 is, and the better the mixing and uniform distribution effect of the tracer is.

[0067] The device of the present application uses the annular pipe 22 as the air distributor 2, so that the air distribution channels can concentrically surround the axis 10 of the air duct 11, and can guide the gas medium containing the tracer to flow annularly in the air distributor 2, promoting the gas medium to spray out into the air duct 11 through the respective air distribution holes 20, and further promoting the full mixing and uniform distribution of the tracer and the air flow in the air duct 11.

[0068] It can be understood that when only one annular pipe 22 is provided for the air distributor 2, the annular pipe 22 is concentrically arranged with the axis 10 of the air duct 11, and its outer peripheral dimension can be set to match the inner diameter dimension of the air duct 1, or can be set to be smaller than the inner diameter dimension of the air duct 1. At the same time, the pipe diameter of the annular air duct 1 can be set to be significantly smaller than the inner diameter dimension of the air duct 1, or can be set to be slightly smaller than the inner diameter dimension of the air duct 1; when the multiple concentric annular pipes 22 of the air distributor 2 adopt a close contact structure without gaps between the pipes, the outer peripheral dimension of the outermost annular pipe 22 can be set to be slightly smaller than the inner diameter dimension of the air duct 1 to leave a certain gap between the air distributor 2 and the inner wall of the air duct 1 to ensure that the air flow in the air duct 11 can flow from the upstream to the downstream through the formed gap.

[0069] It can be understood that when the multiple concentric annular pipes 22 of the air distributor 2 adopt an interval structure with gaps between the pipes (as shown in Figure 3 ), the gaps between the pipe walls of the respective annular pipes 22 form ventilation hole positions spaced from the air distribution channels, and the gas in the air duct 11 can flow from the upstream to the downstream through these gaps between the pipe walls. In this way, the outer peripheral dimension of the outermost annular pipe 22 can be set to match the inner diameter dimension of the air duct 1 to increase the distribution area of the air distribution holes 20 in the air duct 11 and expand the air distribution range of the air distribution holes 20.

[0070] In some embodiments, the spacing between the air distribution holes 20 on the air distribution channels of the same annular pipe 22 is the same or gradually decreases or increases proportionally. For example, the air distribution holes 20 on the same annular pipe 22 can be arranged at equal intervals along the circumferential direction of the annular pipe 22, or can be arranged to gradually approach or move relatively away from each other along the circumferential direction of the annular pipe 22 in proportion.

[0071] Understandably, when the air distributor 2 has multiple concentrically arranged annular pipes 22 at the same time, the annular pipes 22 can be spirally wound around the axis 10 of the air duct 11 with or without a gap centered on the axis 10 of the air duct 11. At this time, the air distribution holes 20 on the air distribution channels of adjacent annular pipes 22 can be arranged at equal intervals along the radial direction of the cross-section of the air duct 1, or can be arranged to gradually approach or move relatively away from each other along the radial direction of the cross-section of the air duct 1 in proportion.

[0072] Please refer to Figure 3 Furthermore, the spacing between the air distribution holes 20 on the multiple annular pipes 22 of the air distributor 2 gradually decreases in the radial direction of the air duct 1, so that the opening mode of the air distribution holes 20 is that the opening spacing gradually decreases from the center to the outer circle.

[0073] When the tracer supply device 5 injects a gas medium containing a tracer into the air distribution channel of the air distributor 2 through the injection pipe 3, a certain air pressure is generated in each annular pipe 22. The opening mode in which the opening spacing of the air distribution holes 20 gradually decreases from the center to the outer circle can achieve the purpose of initially uniformly distributing the tracer concentration within the entire cross-section of the air duct 1 when the tracer is injected.

[0074] To achieve the opening mode of the air distribution holes 20 in which the opening spacing gradually decreases from the center to the outer circle, each annular pipe 22 can be arranged to concentrically surround in a manner that the spacing between the pipe walls gradually decreases, so that the air distribution holes 20 evenly distributed along the air distribution channel can form an opening mode in which the opening spacing gradually decreases from the center to the outer circle according to the circumferential path of each annular pipe 22.

[0075] Please refer to Figure 1 In some embodiments, the device of the present application further includes an air flow mixing component 4. The air flow mixing component 4 is horizontally disposed in the air duct 11 along the radial direction of the air duct 1 and is on the side of the air distributor 2 where the air distribution holes 20 are located, so as to mix the gas medium ejected through the air distribution holes 20 with the air flow in the air duct 11 by rotating.

[0076] The gas mixing component of the device in this application is located downstream of the gas flow direction in the air duct 11 and on the side of the air distributor 2 with air distribution holes 20. It can mix the gas medium containing the tracer ejected through the air distribution holes 20 with the air flow in the air duct 11 by rotation and transport it to the downstream of the gas flow direction. In this way, on the basis of the air distributor 2 achieving the primary mixing and distribution of the tracer and the air flow in the air duct 11, the secondary forced full mixing of the tracer and the air flow in the air duct 11 can be achieved, further promoting the full mixing and uniform distribution of the tracer in the air duct 11.

[0077] Please refer to Figures 2 to 3 , in some embodiments, the air flow mixing component 4 includes an impeller 41. The impeller 41 is rotatably connected in the air duct 1 by a support member (not shown in the figure), and the windward surface of the impeller 41 at least covers the air distribution range of the air distribution holes 20, ensuring that the impeller 41 can stir the gas medium ejected through the air distribution holes 20 and the air flow in the air duct 11 with a large enough windward area.

[0078] The tracer supply device 5 can inject the gas medium containing the tracer into the air distribution channel of the air distributor 2 through the injection pipe 3 at a certain pressure, so that the air distributor 2 can eject the gas medium outward through the air distribution holes 20 at a certain pressure, and then use the kinetic energy of the ejected gas medium to drive the impeller 41 to rotate and stir the air flow in the air duct 11, thereby realizing the secondary forced mixing of the tracer and the air flow in the air duct 11. In this way, the impeller 41 can be set as a non-powered impeller 41, which rotates freely under the drive of the gas medium ejected through the air distribution holes 20, achieving the air flow mixing effect and having better energy-saving effect at the same time.

[0079] Preferably, the impeller 41 can be set as an axial flow impeller or a mixed flow impeller. These two types of impellers 41 have better stirring effects on the tracer and the air flow in the air duct 11, which is conducive to the rapid and uniform mixing of the tracer and the air flow in the air duct 11.

[0080] Preferably, the size of the windward surface of the impeller 41 matches the inner diameter size of the air duct 11, so as to stir the gas medium ejected through the air distribution holes 20 and the air flow in the air duct 11 with the largest windward area.

[0081] Of course, in some other embodiments, the air flow mixing component 4 can also include a rotary drive member (not shown in the figure). The rotary drive member is fixed in the air duct 11, and its power output end is coaxially and fixedly connected to the impeller 41. In this way, the impeller 41 can be directly driven by the rotary drive member to rotate. Compared with the non-powered method, the impeller 41 driven by power has a better stirring effect on the air flow in the air duct 11.

[0082] In some embodiments, the air distributor 2 includes at least one straight pipe (not shown in the figure), and the straight pipe extends linearly along the radial direction of the air duct 1. In this embodiment, one straight pipe is taken as an example for illustration. The inner cavity of the straight pipe forms an air distribution channel, and the air distribution holes 20 are arranged on the pipe wall of the straight pipe.

[0083] Preferably, the length of the straight pipe matches the inner diameter of the air duct 1, so that both ends of the straight pipe can be fixedly connected to the inner wall of the air duct 1 respectively. One end of the straight pipe is communicated with one end of the injection pipe 3 extending into the air duct 1, and the other end of the straight pipe is sealed by the inner wall of the air duct 1. The air distribution holes 20 are evenly distributed along the length direction of the straight pipe. The air flow mixing assembly 4 is horizontally arranged in the air duct 11 along the radial direction of the air duct 1 and is located on the side of the straight pipe with the air distribution holes 20, so as to mix the gas medium ejected through the air distribution holes 20 with the air flow in the air duct 11 by rotation.

[0084] In the device of the present application, a single straight pipe is used as the air distributor 2, so that the air distribution channel can extend linearly along the radial direction of the air duct 1, and the air distribution holes 20 can be linearly distributed along the radial direction of the cross section of the air duct 1. During actual use, the gas medium containing the tracer is first ejected along the radial direction of the air duct 11 through the air distribution holes 20 on the air distributor 2, and then is forced to be stirred by the impeller 41 of the air flow mixing assembly 4, so that the tracer can be fully mixed with the air flow in the air duct 11 and evenly distributed.

[0085] Under the condition that the main air duct is long enough, the air distributor 2 with a single straight pipe can fully realize the full mixing and even distribution of the tracer in the air duct 11, and even without the forced mixing of the air flow mixing assembly 4.

[0086] It can be understood that for the air distributor 2 with a single straight pipe, the air distribution holes 20 on the straight pipe can be arranged to be evenly distributed at equal intervals along the radial direction of the cross section of the air duct 1 with the axis 10 of the air duct 1 as the center, or can be arranged to gradually approach or move relatively away along the radial direction of the cross section of the air duct 1 in proportion.

[0087] In some other embodiments, the air distributor 2 can also include multiple straight pipes arranged along the radial direction of the air duct 1. These straight pipes are preferably arranged in a radial pattern along the radial direction of the air duct 1 with the axis 10 of the air duct 1 as the center, so that the air distribution holes 20 on each straight pipe can form a radial arrangement pattern with the axis 10 of the air duct 1 as the center. The straight pipes of the air distributor 2 converge at the center of the air duct 11 and are communicated with each other. One end of the injection pipe 3 extending into the air duct 1 is respectively communicated with the air distribution channels of each straight pipe through the convergence center in the middle of the air distributor 2.

[0088] It can be understood that as the number of straight pipes increases, the number of air distribution channels is more, the air distribution range of the air distribution holes 20 in the air duct 11 is larger, and the effect of mixing and even distribution of the tracer is better.

[0089] In addition, under the condition that the main air duct is long enough, the air distributor 2 can also be arranged at the axis 10 of the air duct 11, so as to leave a relatively large space between its outer periphery and the inner wall of the air duct 1. The gas medium containing the tracer is injected through a single point at the center of the air duct 11, and the mixing and uniform distribution of the tracer and the air flow in the air duct 11 are realized by means of the length of the main air duct and the air flow mixing assembly 4.

[0090] Please refer to Figure 1 , to detect the uniformity of the mixing of the tracer and the air flow in the air duct 11, the air flow at the front end of the branch pipeline (not shown in the figure) in the air duct 11 can be detected by the mixing detection device 6. The mixing detection device 6 includes a sampler 61, a quantitative sampling system 62, a tracer analyzer 63, and a sampling pipeline 64 connecting the sampler 61, the quantitative sampling system 62 and the tracer analyzer 63. The sampler 61 is horizontally arranged in the air duct 11 along the radial direction of the air duct 1 and is on the air outlet surface side of the air flow mixing assembly 4. Sampling holes 611 are arranged in a dot matrix on the surface facing the air inlet 12 of the air duct 1. A part of the air flow mixed with the tracer in the air duct 11 enters the sampler 61 through the sampling holes 611, and then enters the quantitative sampling system 62 and the tracer analyzer 63 through the sampling pipeline 64, so as to realize the detection and analysis of the mixing degree of the tracer.

[0091] The above is only the preferred implementation mode of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present application by the same token.

Claims

1. A tracer mixing and uniform distribution device, characterized in that: include: An air duct (1), wherein the air duct (1) is provided with an air channel (11) extending along its axial direction and used for gas flow; A blower (2), the blower (2) being disposed transversely in the air duct (11) along the radial direction of the air duct (1); at least one air distribution channel is provided in the blower (2); a plurality of air distribution holes (20) are arranged on the wall surface of the blower (2) facing downstream in the gas flow direction in the air duct (11), which are distributed along the air distribution channel and communicated with the air distribution channel, and the arrangement of the air distribution holes (20) satisfies: when the tracer is injected into the entire air duct (1), the tracer concentration is evenly distributed within the cross-sectional range thereof; An injection pipe (3), one end of which is connected to each air distribution channel of the air distribution device (2), and the other end of which is connected to a tracer supply device (5) so as to inject a gas medium containing a tracer into the air distribution channel.

2. The tracer mixing and uniform distribution device according to claim 1, characterized in that: The air distribution holes (20) are arranged in a spiral manner, or in a concentrically surrounding manner, or in a radial manner, or in a matrix manner, or in a radially linear manner within the cross-sectional area of ​​the air duct (1) with the axis of the air duct (11) as the center; Or / and, the spacing between the air distribution holes (20) on the same air distribution channel is the same or gradually decreases or increases in proportion; Or / and, the spacing between the air distribution holes (20) on adjacent air distribution channels is the same or gradually decreases or increases in proportion.

3. The tracer mixing and uniform distribution device according to claim 1, characterized in that: The outer circumference size of the air distributor (2) matches the inner diameter size of the air duct (1); or the outer circumference size of the air distributor (2) is smaller than the inner diameter size of the air duct (1); Or / and a plurality of ventilation holes spaced apart from the air distribution channel are axially provided on the air distributor (2), and the gas in the air duct (11) flows from upstream to downstream through the ventilation holes.

4. The tracer mixing and uniform distribution device according to claim 1, characterized in that: The air distribution channel is arranged in a circumferential or spiral manner around the axis of the air duct (11).

5. The tracer mixing and uniform distribution device according to claim 4, characterized in that: The air distribution device (2) comprises at least one spiral tube (21), wherein the spiral tube (21) is spirally wound around the axis of the air duct (11); the inner cavity of the spiral tube (21) constitutes the air distribution channel, and the air distribution hole (20) is arranged on the tube wall of the spiral tube (21).

6. The tracer mixing and uniform distribution device according to claim 5, characterized in that: One end of the spiral tube (21) close to the axis of the air duct (11) is connected to the injection pipe (3), and the other end of the spiral tube (21) close to the inner wall of the air duct (1) is a closed end.

7. The tracer mixing and uniform distribution device according to claim 4, characterized in that: The air distribution device (2) comprises at least one annular tube (22), and a plurality of the annular tubes (22) are concentrically arranged around the axis of the air duct (11); the inner cavity of the annular tube (22) constitutes the air distribution channel, and the air distribution hole (20) is arranged on the tube wall of the annular tube (22).

8. The tracer mixing and uniform distribution device according to claim 4, characterized in that: The spacing between the air distribution holes (20) in the radial direction of the air duct (1) gradually decreases.

9. The tracer mixing and uniform distribution device according to claim 1, characterized in that: It also includes an air flow mixing component (4), which is horizontally placed in the air duct (11) along the radial direction of the air pipe (1) and is located on the side of the air distributor (2) having the air distribution holes (20), so as to mix the gas medium ejected through the air distribution holes (20) with the air flow in the air duct (11) by means of rotation.

10. The tracer mixing and uniform distribution device according to claim 9, characterized in that: The air flow mixing component (4) comprises an impeller (41), the impeller (41) is rotatably connected in the air duct (1), and the windward surface of the impeller (41) at least covers the air distribution range of the air distribution hole (20).

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