Rectification net structure and gas flow detection device with same

Abstract

The utility model relates to the technical field of gas flow detection, and discloses a rectifying net structure and a gas flow detection device with the rectifying net structure, the rectifying net structure provided by the utility model is suitable for being arranged at the upstream side of a flow detection piece in a pipeline, and the rectifying net structure comprises a plurality of diversion parts which form a net structure; the flow guide part comprises a first flow guide area and a second flow guide area, and the first flow guide area and the second flow guide area are sequentially arranged in the direction from the upstream to the downstream of the pipeline. The surface of the first flow guide area gradually expands in the upstream-downstream direction of the pipeline, and the surface of the second flow guide area gradually shrinks in the upstream-downstream direction of the pipeline. The rectifying net structure is arranged on the upstream side of the flow detection piece, measured gas can flow along the surface of the flow guide part through guiding of the flow guide part, secondary rectifying is carried out on gas which is affected by an internal structure and has turbulent flow and backflow, the rectified gas is detected through the flow detection piece, and the flow detection accuracy is improved. And the gas flow measurement precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas flow detection technical field, concretely relates to a rectifier net structure and gas flow detection device with it. BACKGROUND

[0002] The existing thermal power generation detects the tail gas flow usually by using the matrix flowmeter.

[0003] In actual detection, the upstream side of the matrix flowmeter usually has structures such as support steel frame, which generates turbulence to the gas flow field, and the detection of the matrix flowmeter depends on the gas flow field, so the turbulence greatly affects the detection accuracy of the matrix flowmeter. SUMMARY

[0004] Therefore, the utility model provides a rectifier net structure and gas flow detection device with it to solve the problem that the matrix flowmeter is affected by the turbulence generated by the structures such as support steel frame on the upstream side when detecting the flow, which affects the flow detection accuracy.

[0005] In the first aspect, the utility model provides a rectifier net structure which is suitable for being arranged on the upstream side of the flow detection part in the pipeline, and the rectifier net structure comprises:

[0006] A plurality of flow guide parts form a net structure.

[0007] The flow guide part comprises a first flow guide area and a second flow guide area, and the first flow guide area and the second flow guide area are arranged in sequence along the upstream-to-downstream direction of the pipeline.

[0008] The surface of the first flow guide area is gradually expanded along the upstream-to-downstream direction of the pipeline, and the surface of the second flow guide area is gradually contracted along the upstream-to-downstream direction of the pipeline.

[0009] Optionally, the outer edge of the first flow guide area is arc-shaped, and the outer edge of the second flow guide area is V-shaped in the cross section perpendicular to the extension direction of the flow guide part.

[0010] Optionally, the plurality of flow guide parts comprise a plurality of first flow guide parts and a plurality of second flow guide parts, the plurality of first flow guide parts are parallel to each other, the plurality of second flow guide parts are parallel to each other, and the first flow guide parts and the second flow guide parts intersect each other.

[0011] Optionally, the plurality of flow guide parts are arranged in parallel.

[0012] Optionally, the distance between the adjacent two flow guide parts is equal.

[0013] Optionally, at least one end of the flow guide part is provided with a connecting part for connecting with the inner wall of the pipeline.

[0014] Optionally, the connecting part is a connecting rod protruding from the end face of the flow guide part.

[0015] In the second aspect, the utility model provides a gas flow detection device, comprising:

[0016] a plurality of flow detection members;

[0017] The rectifying net structure of any one of the above.

[0018] Optionally, the normal vector direction of the measurement section of the flow detection member is perpendicular to the width direction of the flow guide part.

[0019] Optionally, the measurement sections of the plurality of flow detection members are respectively arranged in alignment with different mesh centers of the net structure.

[0020] Beneficial effects:

[0021] 1. The rectifying net structure is arranged on the upstream side of the flow detection member, and the secondary rectification is carried out on the gas affected by the internal structure and having disturbance and backflow, so that the rectified gas passes through the flow detection member to be detected, and the gas flow measurement precision is improved.

[0022] 2. The surface of the first flow guide area is gradually expanded along the pipeline from the upstream to the downstream, and the surface of the second flow guide area is gradually contracted along the pipeline from the upstream to the downstream, so that the measured gas can flow along the surface of the flow guide part, the rectification effect is improved, and the detection precision of the measured gas flow is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0024] Figure 1 It is a front view of the rectifying net structure and the position relationship of the flow detection member of the utility model embodiment;

[0025] Figure 2 It is a front view of the rectifying net structure and the position relationship of the flow detection member of the utility model embodiment; Figure 1 It is a side view of the rectifying net structure and the position relationship of the flow detection member shown in the drawing;

[0026] Figure 3 It is a three-dimensional schematic view of the flow guide part;

[0027] Figure 4 is a sectional view of the flow guide part;

[0028] Explanation of reference numerals:

[0029] 1, flow detection member; 2, flow guide part; 21, first flow guide part; 22, second flow guide part; 201, first flow guide area; 202, second flow guide area; 3, connecting part. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0031] Please refer to Figures 1-4 On the one hand, a rectifying net structure is provided, a flow detection member 1 for detecting the flow of gas is arranged in the pipeline, and the rectifying net structure is suitable for being arranged on the upstream side of the flow detection member 1 to rectify the gas flowing towards the flow detection member 1.

[0032] Refer to Figure 1 , Figure 3 , Figure 4 The rectifying net structure comprises a plurality of flow guide parts 2, and the plurality of flow guide parts 2 form a net structure. The net structure is arranged on one cross section of the pipeline, and a plurality of meshes are arranged on the net structure. When the measured gas flows in the pipeline, it is rectified after passing through the meshes on the net structure.

[0033] Among them, the flow guide part 2 comprises a first flow guide area 201 and a second flow guide area 202, and the first flow guide area 201 and the second flow guide area 202 are arranged in sequence along the upstream-to-downstream direction of the pipeline; the surface of the first flow guide area 201 is gradually expanded along the upstream-to-downstream direction of the pipeline, and the surface of the second flow guide area 202 is gradually contracted along the upstream-to-downstream direction of the pipeline.

[0034] In this way, when the measured gas flows along the surface of the flow guide part 2, the measured gas first contacts one end of the first flow guide area 201, and the first flow guide area 201 widens as it extends in the downstream direction of the pipeline. When the measured gas flows along the surface of the first flow guide area 201 of the flow guide part 2, the flow rate of the measured gas is adjusted. After passing the connection position of the first flow guide area 201 and the second flow guide area 202, the second flow guide area 202 narrows as it extends in the downstream direction, so that the measured gas continues to flow along the surface of the second flow guide area 202 and accelerates, thereby realizing more concentrated and parallel flow lines of the measured gas, which is beneficial to the flow detection of the flow detection member 1 in the downstream direction and improves the flow detection accuracy.

[0035] In this embodiment, the flow guide part 2 includes the first flow guide area 201 and the second flow guide area 202, and the first flow guide area 201 and the second flow guide area 202 are reduced in width in the direction away from each other, so that the connection position of the first flow guide area 201 and the second flow guide area 202 has the maximum width, and the end of the first flow guide area 201 and the second flow guide area 202 away from each other has the minimum width. In the cross section perpendicular to the extension direction of the flow guide part 2, the outer edge of the first flow guide area 201 is V-shaped, and the outer edge of the second flow guide area 202 is V-shaped, that is, the outer edge shape of the cross section of the flow guide part 2 is shuttle-shaped. The shuttle-shaped structure has an outer surface with a middle part wide and two ends narrow, and the flow guide function of the flow guide part 2 is realized by using the shuttle-shaped structure.

[0036] Preferably, in the cross section perpendicular to the extension direction of the flow guide part 2, the outer edge of the first flow guide area 201 is arc-shaped, and the outer edge of the second flow guide area 202 is V-shaped. In this way, the outer edge shape of the cross section of the flow guide part 2 is water drop-shaped.

[0037] In this embodiment, in the cross section of the flow guide part 2, the first flow guide area 201 is an arc-shaped line, and the second flow guide area 202 is two inclined lines. The two ends of the arc-shaped line of the first flow guide area 201 and the two inclined lines of the second flow guide area 202 are directly connected to form a water drop-shaped structure with a closed surface, so that the connection of the first flow guide area 201 and the second flow guide area 202 is better transitioned, and the flow guide effect of the flow guide part 2 is improved.

[0038] Specifically, the arc-shaped line of the first flow guide area 201 is a smooth curve, so that the arc-shaped surface of the first flow guide area 201 is a smooth surface. The smooth surface can reduce the frictional resistance between the measured gas and the first flow guide area 201, reduce energy loss, and improve the overall flow guide performance of the flow guide part 2. The outer edge of the second flow guide area 202 is a V-shaped line, the other ends of the two inclined lines are connected, the included angle between the two inclined lines is preferably an acute angle, and the two inclined lines are preferably smooth lines, so that the V-shaped surface of the second flow guide area 202 is smooth, and the frictional resistance between the measured gas and the second flow guide area 202 is reduced.

[0039] It can be understood that the first flow guide area 201 is located on the upstream side of the second flow guide area 202. When the measured gas flows to the flow detection piece 1 and passes through the flow guide part 2, the measured gas first impacts the first flow guide area 201 with a wide arc-shaped surface. Under the action of inertia, the gas flows along the surface of the first flow guide area 201. After passing through the connection between the first flow guide area 201 and the second flow guide area 202, the measured gas flows on the second flow guide area 202. When the measured gas flows on the surface of the second flow guide area 202, the gradually narrowing structure of the surface of the second flow guide area 202 promotes the acceleration of the measured gas, and the measured gas is guided out along the surface of the second flow guide area 202. In this way, the second flow guide area 202 is used to accelerate the measured gas, and the influence of the flow rate caused by the setting of the flow straightening device in the pipeline is reduced.

[0040] Optionally, the plurality of flow guide parts 2 includes a plurality of first flow guide parts 21 and a plurality of second flow guide parts 22, the plurality of first flow guide parts 21 are parallel, the plurality of second flow guide parts 22 are parallel, and the first flow guide part 21 and the second flow guide part 22 intersect.

[0041] It can be understood that in the radial cross section of the pipeline, the plurality of flow guide parts 2 are divided into a plurality of first flow guide parts 21 and a plurality of second flow guide parts 22. The first flow guide part 21 in the cross section of the pipeline serves as a warp, and the second flow guide part 22 in the cross section of the pipeline serves as a weft. The first flow guide part 21 as the warp and the second flow guide part 22 as the weft are arranged in a cross shape to form a grid-shaped flow straightening net structure.

[0042] In an embodiment, when the extension direction of the first flow guide part 21 and the extension direction of the second flow guide part 22 are perpendicular, the grid of the net-shaped structure is a square, and the measured gas is straightened under the action of the flow guide part 2 when passing through the gas passage of the square. Alternatively, the extension direction of the first flow guide part 21 and the extension direction of the second flow guide part 22 are not perpendicular, the grid of the net-shaped structure is a rhombus, and the measured gas is straightened under the action of the flow guide part 2 when passing through the gas passage of the rhombus.

[0043] In the above embodiment, the first flow guide part 21 and the second flow guide part 22 arranged in a cross shape are fixedly connected by welding, screwing or bonding. For example, the vertically arranged second flow guide part 22 is cut into two parts and separated, the horizontally arranged first flow guide part 21 is placed between the two parts of the vertically arranged second flow guide part 22, and the vertically arranged second flow guide part 22 is welded and fixed on the horizontally arranged first flow guide part 21 by welding to realize the cross-shaped interlaced connection of the first flow guide part 21 and the second flow guide part 22 and the same plane. By using this connection method, the horizontally arranged first flow guide part 21 and the vertically arranged second flow guide part 22 are located on the same cross section of the pipeline, and the first flow guide part 21 and the second flow guide part 22 can cover the flow straightening net structure, thereby improving the flow straightening effect of the gas.

[0044] Alternatively, in addition to the above-described arrangement, the first flow guide 21 and the second flow guide 22 can be connected through a connecting piece (not shown in the figure). For example, the connecting piece is in a cross-shaped structure, and the four legs of the connecting piece are respectively provided with receiving grooves. One end of the first flow guide 21 and one end of the second flow guide 22 are respectively inserted into different receiving grooves and fixed with the connecting piece, so that the first flow guide 21 and the second flow guide 22 are arranged in a cross-shaped staggered manner. By using this connection mode, the rectifier net structure is convenient to assemble and disassemble, and when a single first flow guide 21 or second flow guide 22 is damaged, the damaged first flow guide 21 or second flow guide 22 can be conveniently and quickly replaced.

[0045] Optionally, the plurality of flow guides 2 are arranged in parallel.

[0046] In the embodiment, the plurality of flow guides 2 are warp threads on the cross section of the pipeline, or the plurality of flow guides 2 are weft threads on the cross section of the pipeline, and the gas passage between adjacent flow guides 2 is in a strip shape. The measured gas realizes rectification under the action of the flow guides 2 when passing through the strip-shaped gas passage.

[0047] Optionally, the distance between the two adjacent flow guides 2 is equal. The plurality of flow guides 2 are distributed in the pipeline at intervals, and the plurality of flow guides 2 are parallel to each other. The equal distance between the two adjacent flow guides 2 ensures that the flow rate of the measured gas is relatively uniform at each position when the measured gas passes through the rectifier net structure, suppresses unstable rotating airflow and backflow phenomenon, and reduces the generation of turbulent flow. And the balanced distribution of the flow guides 2 helps to reduce local resistance.

[0048] Optionally, at least one end of the flow guide 2 is provided with a connecting part 3, and the connecting part 3 is used to connect with the inner wall of the pipeline.

[0049] In an embodiment, the connecting part 3 is fixed with one end of the flow guide 2, and the connecting part 3 is used as a support body of the flow guide 2 to keep the flow guide 2 at a predetermined position of the pipeline, avoiding the displacement of the flow guide 2 relative to the pipeline when the measured gas flows. The end of the connecting part 3 is fixed with the inner wall of the pipeline by welding, screwing or the like, which is convenient for the installation and disassembly of the rectifier net structure relative to the pipeline.

[0050] In another embodiment, the flow guide 2 is a hollow structure, the flow guide 2 is sleeved on the outer side surface of the connecting part 3, and the inner wall of the flow guide 2 and the outer wall of the connecting part 3 are fixedly attached. The connecting part 3 penetrates through the flow guide 2, the connecting strength of the connecting part 3 and the flow guide 2 is improved, and the supporting strength of the flow guide 2 is further improved. Alternatively, the flow guide 2 is a hollow structure, the flow guide 2 is sleeved on the outer side of the connecting part 3, a gap is arranged between the inner wall of the flow guide 2 and the outer wall of the connecting part 3, and the inner wall of the flow guide 2 is connected and fixed with the connecting part 3 through a connecting frame (not shown in the figure). The connecting strength of the connecting part 3 and the flow guide 2 is improved, and the flow guide 2 is lightened at the same time, so that the whole rectifier net structure is lightened.

[0051] In the above embodiment, when the flow guide 2 is a hollow structure, the flow guide 2 is sleeved and covered on the whole position of the outer side wall of the connecting part 3. When the measured gas passes through the flow guide 2, the measured gas directly contacts the flow guide 2 and cannot contact the connecting part 3, so that the influence of the structure of the connecting part 3 on the rectification process is reduced, and the rectification effect of the rectifier net structure is improved.

[0052] Further, the connecting part 3 is a connecting rod protruding from the end surface of the flow guide 2.

[0053] In the embodiment, the connecting rod can be a rod body structure with a certain hardness, for example, a cylinder, a triangular prism, a quadrangular prism and the like.

[0054] According to the embodiment of the utility model, referring to Figure 1 、 Figure 2 On the other hand, the utility model also provides a gas flow detection device, which comprises a plurality of flow detection pieces 1 and the rectifier net structure. The flow detection pieces 1 are arranged in a matrix according to actual needs, and the rectifier net structure is located on the upstream side of all the flow detection pieces 1, that is, the rectifier net structure is located on the upstream side of the flow detection piece 1 closest to the upstream side, so that the measured gas has completed the rectification operation before passing through the pipe section provided with the flow detection piece 1, and the detection precision is improved.

[0055] In one embodiment, the flow detection piece 1 is a pitot tube. The working principle of the pitot tube is to calculate the flow rate based on the difference between the total pressure and the static pressure of the measured fluid. The pitot tube mainly comprises two concentric tubes, including a total pressure tube and a static pressure tube. The total pressure tube located at the front end of the pitot tube is a sharp probe part. The total pressure tube is used to collect the total pressure in the flow direction of the fluid, and the total pressure includes the sum of the kinetic energy, potential energy and static pressure energy of the fluid. The static pressure tube is concentrically arranged with the total pressure tube, and the total pressure tube and the static pressure tube are communicated through a small hole. The static pressure tube is used to measure the static pressure of the fluid. The static pressure is the pressure of the fluid acting vertically on the container wall. The static pressure of each point on the same horizontal plane is equal.

[0056] When the flow detection piece 1 is a pitot tube, the pitot tube has strict directionality. Under the flow guiding effect of the flow guiding part 2, the probe of the total pressure tube is directed to the flow direction of the measured gas, so that the total pressure can be accurately measured, and the measurement accuracy of the flow detection piece 1 is improved.

[0057] Further, a disturber (not shown in the figure) is arranged in the pitot tube. The disturber can be a thin iron wire or a thin linear structure with certain hardness. The kinetic energy of the gas is utilized to disturb the pitot tube, so that the solid particles in the measurement process are self-cleaned, and the equipment maintenance amount is reduced.

[0058] Of course, in addition to the pitot tube, the flow detection piece 1 can also be a flow meter. The flow meter is used to measure the flow of gas in the pipeline, and the flow meter can directly give the volume flow of the gas. Similarly, under the flow guiding effect of the flow guiding part 2, the probe of the flow meter is directed to the flow direction of the measured gas, so that the influence of the disturbance flow generated by the flow field is reduced, and the measurement accuracy of the flow detection piece 1 is improved.

[0059] Optionally, the normal vector direction of the measurement section of the flow detection piece 1 is perpendicular to the width direction of the flow guiding part 2.

[0060] It can be understood that, in the cross section perpendicular to the extension direction of the flow guiding part 2, the width direction of the flow guiding part 2 is perpendicular to the normal vector direction of the measurement section of the flow detection piece 1. When the flow detection piece 1 is a pitot tube, the measurement section of the flow detection piece 1 is a sharp probe part. In this way, when the gas passes through the grid structure, the gas is affected by the flow guiding part 2, and the gas is re-flowed, so that the measured gas flows along the outer edge surface of the flow guiding part 2, and the flow line of the measured gas is parallel to the center line of the flow guiding part 2. Under the effect of the flow guiding part 2, the laminar flow of each divided surface is maximized, the gas flow line is perpendicular to the pressure measurement section, and the problem that the pressure measurement section and the gas flow direction exist at an angle in the existing matrix flow measurement is avoided.

[0061] Optionally, the measurement sections of the plurality of flow detection pieces 1 are respectively arranged in alignment with different grid centers of the grid structure. When the matrix measurement mode is adopted, the flow detection piece 1 is provided with a plurality of flow detection pieces, and the grid structure formed by the plurality of flow guiding parts 2 has a plurality of arrayed grids. According to actual needs, the flow detection pieces 1 are arranged at different positions in the pipeline, and the measurement sections of the different flow detection pieces 1 correspond to different grid center positions.

[0062] In this way, by arranging the measurement sections of the flow detection pieces 1 in alignment with the grid center positions, the local flow field characteristics near the flow detection pieces 1 can be better captured, the measurement error caused by the non-uniformity of the gas flow is reduced, and the detection accuracy is further improved.

[0063] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. A rectifier grid structure, characterized by The flow regulation net structure is suitable for being arranged on the upstream side of a flow detection member (1) arranged in a pipeline, and comprises: a plurality of flow guiding portions (2) forming a net structure; wherein the flow guiding portion (2) comprises a first flow guiding area (201) and a second flow guiding area (202), which are arranged in sequence along the upstream-to-downstream direction of the pipeline; the surface of the first flow guiding area (201) is divergent along the upstream-to-downstream direction of the pipeline, and the surface of the second flow guiding area (202) is convergent along the upstream-to-downstream direction of the pipeline.

2. The rectifier grid structure of claim 1, wherein along the cross section perpendicular to the extending direction of the flow guiding portion (2), the outer edge of the first flow guiding area (201) is arc-shaped, and the outer edge of the second flow guiding area (202) is V-shaped.

3. The rectenna structure of claim 1 or 2, wherein, the plurality of flow guiding portions (2) comprise a plurality of first flow guiding portions (21) and a plurality of second flow guiding portions (22), the plurality of first flow guiding portions (21) are parallel to each other, the plurality of second flow guiding portions (22) are parallel to each other, and the first flow guiding portions (21) and the second flow guiding portions (22) intersect with each other.

4. The rectenna structure of claim 1 or 2, wherein the plurality of flow guiding portions (2) are arranged in parallel.

5. The rectifier grid structure of claim 1, wherein the distance between two adjacent flow guiding portions (2) is equal.

6. The rectifier grid structure of claim 1, wherein at least one end of the flow guiding portion (2) is provided with a connecting portion (3) for connecting with the inner wall of the pipeline.

7. The rectifier grid structure of claim 6, wherein the connecting portion (3) is a connecting rod protruding from the end surface of the flow guiding portion (2).

8. A gas flow rate detecting device characterized by comprising: comprise: a plurality of flow detection members (1); the flow regulation net structure of any one of claims 1-7.

9. The gas flow detection device according to claim 8, wherein the normal vector direction of the measurement section of the flow detection member (1) is perpendicular to the width direction of the flow guiding portion (2).

10. The gas flow detection device according to claim 8, wherein the measurement sections of the plurality of flow detection members (1) are respectively arranged in alignment with different grid centers of the net structure.

Images