JP2010017661A - Apparatus for accelerating diffusion of fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for accelerating the diffusion of fluid which can improve the diffusion. <P>SOLUTION: Four isosceles triangle-shaped plates 12 are arranged at prescribed intervals in a duct 2 so that each base part 12a is positioned on a plane crossing the flow direction in the duct 2 rectangularly and the base part 12a is arranged along the inner wall surface 2a of the duct 2. Four diffusion set bodies 11 each made by slanting each plate 12 are arranged in a plane crossing the flow direction in the duct 2 rectangularly so that the apex part 12b of each plate 12 is positioned on the upstream side of the flow and these apex parts 12b are positioned in an inside space part surrounded by each base part 12a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a diffusion accelerating device that is arranged in a flow path to promote diffusion of fluid.

  The exhaust gas discharged from an incinerator or the like contains nitrogen oxides, and a reducing agent is sprayed into the exhaust gas upstream of the catalyst in order to remove the nitrogen oxides contained in the exhaust gas. However, it is necessary to diffuse the reducing agent as uniformly as possible in the exhaust gas so as to effectively perform the denitration action by the catalyst.

By the way, as what diffuses the reducing agent sprayed in exhaust gas uniformly, there exists a mixer etc. which arranged many triangular plate bodies in order, for example (for example, refer to patent documents 1). In this mixer, a large number of triangular plates are arranged, the tops of the rows are opposite to each other at a predetermined inclination angle with respect to the flow direction, and the inclination directions are also opposite. Thus, the mixing of the fluid is promoted.
JP 2000-198615 A

  However, according to the above-described conventional mixer, a large number of triangular plate bodies are arranged, and the tops thereof are opposite to each other at a predetermined inclination angle with respect to the flow direction, and the inclination direction thereof. Is also reversed to allow fluid mixing, i.e., fluid diffusion, but further diffusion is desired.

  Then, an object of this invention is to provide the diffusion promotion apparatus of the fluid which can aim at the further spreading | diffusion of a fluid.

  In order to solve the above-described problem, a fluid diffusion promoting apparatus according to claim 1 of the present invention includes a plurality of triangular plate bodies in a flow path, and a plane in which each bottom portion is orthogonal to the flow direction in the flow path. It is arranged at a predetermined interval so that its bottom part is along the wall surface of the flow path, and the top part of each plate is located on the upstream side of the flow. Each plate is inclined so as to be located in the inner space part surrounded by the bottom part.

  The fluid diffusion promoting device according to claim 2 is such that the inclination angle of the plate in the fluid promoting device according to claim 1 is in the range of 10 to 50 degrees with respect to the center line of the inner space portion. It is a thing.

  In addition, the fluid diffusion promoting device according to claim 3 has a cross-sectional shape parallel to the bottom portion of the plate of the fluid promoting device according to claim 1 or 2, and a curved shape that bulges outside the inner space portion. It is a thing.

According to a fourth aspect of the present invention, there is provided a fluid diffusion promoting device capable of adjusting an inclination angle of an arbitrary plate in the fluid promoting device according to any one of the first to third aspects.
According to a fifth aspect of the present invention, there is provided a fluid diffusion promoting device having a circular cross section of the flow path in the fluid promoting device according to any one of the first to fourth aspects.

  According to a sixth aspect of the present invention, there is provided a fluid diffusion promoting apparatus according to any one of the first to fourth aspects, wherein the cross section of the flow path in the fluid promoting apparatus according to any one of the first to fourth aspects is rectangular. Four pieces are arranged corresponding to the wall surface.

  According to a seventh aspect of the present invention, there is provided a fluid diffusion promoting apparatus including a plurality of diffusion assemblies, each having a set of four plates in the fluid diffusion promoting apparatus according to the sixth aspect, along a flow direction in the flow path. They are arranged.

  A fluid diffusion promoting apparatus according to claim 8 is a plane perpendicular to the flow direction in the flow path, wherein the diffusion assembly is a set of four plates in the fluid diffusion promoting apparatus according to claim 6. A plurality are arranged inside.

  Furthermore, the fluid diffusion promoting apparatus according to claim 9 is a planar diffusion assembly in which a plurality of diffusion assemblies in the fluid diffusion promoting apparatus according to claim 8 are arranged in a plane perpendicular to the flow direction in the flow path. A plurality of bodies are arranged along the flow direction in the flow path.

  According to the configuration of the diffusion facilitating device, a plurality of triangular plates are placed in the flow path so that each bottom side is located on a plane perpendicular to the flow direction in the flow path, and the bottom side is the flow. It is arranged at a predetermined interval along the wall surface of the road, and the tops of these plates are positioned on the upstream side of the flow, and the tops are positioned in the inner space surrounded by the bases. Since each plate is tilted, that is, because the triangular plate is arranged on the side of the pyramid, the fluid flowing through the flow path first collides with the narrow part on the top side of the triangle. After a vortex that circulates around the plates, the velocity increases as it flows along the bottom side of the wide plate, and moreover, the fluid with this increased speed is a number of fluids between the plates. To flow into the inner space surrounded by the plate Fluid is further stirred. That is, when an atomized substance such as a reducing agent is blown into the fluid, the diffusion is further promoted.

  For example, like a conventional mixer, a large number of triangular plates are arranged, and the tops of the rows are opposite to each other at a predetermined inclination angle with respect to the flow direction, and the inclination directions are also reversed. Compared to the one in which the fluid is mixed in the direction, the fluid can be further diffused.

  Further, by arranging a plurality of diffusion assemblies in which triangular plate bodies are arranged on the side surface of the pyramid in parallel and / or along the flow, vortices generated in each diffusion assembly can be mutually connected. Interference results in vortices of different strengths, and further diffusion takes place.

A fluid diffusion promoting apparatus according to an embodiment of the present invention will be described below with reference to the drawings.
In the present embodiment, for example, a diffusion promoting apparatus used for spraying a reducing agent for denitration will be described.

  That is, in this diffusion promoting device, a reducing agent is sprayed (injected) into the exhaust gas upstream of the catalyst in order to remove nitrogen oxides contained in the denitration fluid, for example, exhaust gas from the incinerator. The reducing agent is used to diffuse the catalyst more uniformly to effectively perform the denitration action by the catalyst.

  As shown in FIG. 1 to FIG. 3, this diffusion promoting device 1 is a duct having a square cross-section (which is an example of a rectangular shape, of course, may be a rectangle) that guides the exhaust gas G that is a denitration fluid and has a relatively large diameter. A plurality of (a plurality of) diffusion assemblies 11, which are arranged in the middle of 2, are each a set of four thin plate bodies 12 each having an isosceles triangle (or a regular triangle) shape in plan view (or front view). It can be said to be a set). For example, it is configured by arranging four pieces vertically and horizontally. Of course, when the diameter of the duct 2 is small, only one diffusion assembly 11 may be arranged.

  As shown in FIGS. 4 and 5, the diffusion assembly 11 has four triangular or isosceles triangular plate bodies 12 at predetermined positions in the duct 2, and each base 12 a is the same in the duct 2. The cross section, that is, on the plane perpendicular to the flow direction in the duct 2 and with the bottom portion 12a extending along the inner wall surface 2a of the duct 2 (substantially the same interval including the corner portion, naturally the same) M) (including the interval), and the tops (vertices of isosceles triangles) 12b of each plate 12 are positioned on the upstream side of the flow, and each top 12b has four plates 12. Each plate 12 is preferably located within a predetermined angle θ (within a range of 10 to 50 degrees) with respect to the center line a so as to be positioned on the inner space P side surrounded by Is a range of 10 to 30 degrees. For example, if the angle is less than the lower limit of the angle, the vortex is not sufficiently generated when the exhaust gas G collides with the plate body 12, and if the upper limit is exceeded, the vortex is disturbed. In this case, sufficient diffusion is not performed.)

  More specifically, the plate body 12 is disposed in each of the four triangular side surfaces S (also referred to as side surfaces) of a virtual quadrangular pyramid (an example of a pyramid). Therefore, if the apex angle of the virtual quadrangular pyramid K is 2θ, and the length of the bottom side of each side surface S is KL, the length L of the bottom side 12a of the plate 12 is 0.6KL to 0.9KL. The height H is within the range of 0.7 to 2 times (that is, 0.7L to 2L) with respect to the length L of the bottom portion 12a.

  As shown in FIG. 3, the diffusion assembly 11 is arranged in the duct 2 with a predetermined interval δ on the top, bottom, left, and right. The distance from the wall surface 2a is also the same as the predetermined distance δ between the diffusion assemblies 11, for example. Each plate 12 is fixed in the duct 2 with a thin wire or bar (not shown).

  In the above configuration, when the exhaust gas G flows through the duct 2, the flow of the exhaust gas G is in a state as shown in FIG. In addition, the arrow of FIG. 6 has shown the velocity vector of the waste gas G, and the length of the vector represents the magnitude | size.

  From FIG. 6, in the arrangement | positioning location of the spreading | diffusion promoting apparatus 1, the triangular plate body 12 with which the upstream side was made thin and sharp, and the downstream side was widened is inclined and arrange | positioned so that the top parts 12b may approach. Therefore, first, a vortex is generated at the top portion 12b, and the exhaust gas G having a uniform flow flowing through the central portion of each diffusion assembly 11 is guided to the outside along the surface of the plate body 12, and on the outside thereof. The amount of gas introduced also gradually increases as it goes downstream, so that its speed also increases. Therefore, the exhaust gas G is at a high speed between the pair of plate bodies 12 corresponding to the corner portions of the diffusion assembly 11, and the inner space. It can be clearly seen that it flows into the part P, that is, it flows in the opposite direction.

  That is, the presence of this diffusion assembly 11 causes vortices in the flow of the exhaust gas G and disturbs the magnitude and direction of the speed, so that the reducing agent sprayed in the exhaust gas G is effectively, that is, the conventional It will be further diffused compared with the mixer. Further, since four diffusion assemblies 11 having the above effects are arranged in a plane orthogonal to the flow, the exhaust gases G guided to the outside of each diffusion assembly 11 are compressed and collided with each other. After that, since it flows into a wide downstream space where there is no object that obstructs the flow, the reducing agent sprayed in the duct 2 is further diffused (more uniformly).

  In other words, a plurality of isosceles triangular plate bodies 12 are arranged in the duct 2 such that each bottom side 12a is positioned on a plane orthogonal to the flow direction in the duct 2 and the bottom side 12a is formed on the duct 2. The inner space portion P is disposed along the inner wall surface 2a at a predetermined interval, and the top portions 12b of the plate bodies 12 are positioned on the upstream side of the flow, and the top portions 12b are surrounded by the bottom portions 12a. Since each plate 12 is inclined so as to be located inside, that is, the isosceles triangle plate 12 is arranged on the side surface of the quadrangular pyramid, the exhaust gas G flowing in the duct 2 is First, after colliding with a narrow part on the top part 12b side of the isosceles triangle and generating a vortex, the speed increases when flowing along the bottom part 12a side of the wide plate 12, and this speed increases. Exhausted Scan G, because the flow into the plate member 12 inside the space portion P surrounded by four plate members 12 from between the adjacent exhaust gas G is further stirred. That is, when an atomized substance (or other fluid) such as a reducing agent is blown into the exhaust gas G, the diffusion is further promoted.

  For example, like a conventional mixer, a large number of triangular plates are arranged, and the tops of the rows are opposite to each other at a predetermined inclination angle with respect to the flow direction, and the inclination directions are also reversed. It is possible to further promote the diffusion of the fluid as compared with the case where the fluid flow direction is changed to be laminar and the fluid is mixed only by the vortex generated from the top.

  By the way, in the said embodiment, although the four diffusion assemblies 11 were arrange | positioned in the plane (it can be said that it is the same or substantially the same cross section) orthogonal to a flow direction, as shown, for example in FIG. Are arranged in a plane orthogonal to the flow direction in the front and rear, that is, a total of eight diffusion assemblies 11 are arranged. Further, as shown in FIG. 8, four (2 × 2) diffusion assemblies 11 may be arranged on the front side and nine (3 × 3) on the rear side. In addition, when nine are arranged, as shown in FIG. 8, the front four diffusion assemblies 11 are located between the diffusion assemblies 11 located on the rear side (so-called zigzag pattern). ) Arranged. When the cross-sectional area of the duct is small, a plurality of one diffusion assembly 11 may be arranged in the front-rear direction.

  In this way, by arranging a plurality of diffusion assemblies 11 and / or a plurality of diffusion assemblies 11 along the flow direction in a plane orthogonal to the flow (that is, a plurality of diffusion assemblies 11 in parallel and / or front and back). Since the vortices generated in the respective diffusion assemblies 11 interfere with each other to generate vortices having different strengths, further diffusion is performed.

  Further, as shown in FIG. 9, the triangular plate body 12 ′ may have a curved shape in which a cross-sectional shape parallel to the bottom portion 12 ′ a swells toward the inner wall surface 2 a of the duct 2 ( So-called “warping” may be imparted).

  Further, as shown in FIG. 10, a plate material having a predetermined width and a predetermined length (length in the side edge direction) is applied to both side edge portions 12c in the vicinity of the top portion 12b of any or all plate bodies 12 as a vortex stabilizing plate. 14 (of course, a vortex stabilizing plate may also be attached to the plate 12 'shown in FIG. 9). The vortex stabilizing plate 14 can stabilize the vortex generated in the vicinity of the top portion 12b and delay the disappearance of the vortex.

  Although not shown, the bottom 12a (12'a) of any or all of the plate bodies 12 (12 ') is supported on the duct 2 side via a rod-shaped member, and the rod-shaped member is configured to be rotatable. Thus, the inclination angle of the plate body 12 may be adjustable.

  With this configuration, an optimum inclination angle can be obtained with respect to the actual exhaust gas flow. For example, when dust or the like adheres to the plate, the attached dust is removed by swinging the plate. Can be dropped.

  Furthermore, in the said embodiment, although the cross-sectional shape of the duct was demonstrated as square (or rectangular shape), it is applicable also when it is circular, for example. In this case, triangular plate bodies are arranged at predetermined intervals along the inner wall surface of the circular duct. That is, the bottom side portion of each plate is arranged along each side of the polygon. In some cases, the bottom side of the plate may be curved along the inner wall surface of the circular duct.

1 is a perspective view showing a schematic configuration of a diffusion promoting device according to an embodiment of the present invention. It is a top view of the diffusion promoting device. It is the front view seen from the upstream of the diffusion promotion apparatus. It is a perspective view of the diffusion assembly in the diffusion promoting device. It is a side view of the diffusion assembly in the diffusion promoting device. It is a figure which shows the velocity vector of the waste gas which shows the diffusion state by the diffusion promotion apparatus. It is a top view which shows schematic structure which concerns on the modification of the diffusion promotion apparatus which concerns on embodiment of this invention. It is a top view which shows schematic structure which concerns on the other modification of the diffusion promoting apparatus which concerns on embodiment of this invention. It is a perspective view which shows the modification of the board in the diffusion promoting apparatus which concerns on embodiment of this invention. It is a perspective view which shows the other modification of the board in the diffusion promoting apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diffusion promotion apparatus 2 Duct 2a Inner wall surface 11 Diffusion assembly 12 Plate body 12a Bottom side part 12b Top part 12c Side edge part 13 Plane diffusion assembly 14 Vortex stabilization board

Claims (9)

  A plurality of triangular plates in the channel are arranged at predetermined intervals so that each bottom side is located on a plane perpendicular to the flow direction in the channel and the bottom side is along the wall surface of the channel. In addition, the plate bodies are inclined so that the top portions of the plate bodies are located on the upstream side of the flow and the top portions are located in the inner space surrounded by the base portions. A fluid diffusion promoting device.   2. The fluid diffusion promoting apparatus according to claim 1, wherein an inclination angle of the plate body is in a range of 10 to 50 degrees with respect to a center line of the inner space portion.   The fluid diffusion promoting apparatus according to claim 1 or 2, wherein a cross-sectional shape parallel to the bottom side of the plate body is a curved shape that swells outside the inner space.   The fluid diffusion promoting apparatus according to any one of claims 1 to 3, wherein an inclination angle of an arbitrary plate can be adjusted.   The fluid diffusion promoting apparatus according to any one of claims 1 to 4, wherein a cross section of the flow path is circular.   The fluid according to any one of claims 1 to 4, wherein the cross section of the flow path is rectangular, and four plates are arranged corresponding to the four wall surfaces forming the flow path. Diffusion promotion device.   The fluid diffusion promoting apparatus according to claim 6, wherein a plurality of diffusion assemblies each including a set of four plate bodies are arranged along a flow direction in the flow path.   A diffusion of fluid characterized in that a plurality of diffusion assemblies each including four plates in the fluid diffusion promoting device according to claim 6 are arranged in a plane perpendicular to the flow direction in the flow path. Promotion device.   A plurality of planar diffusion assemblies in which a plurality of diffusion assemblies in the fluid diffusion promoting device according to claim 8 are arranged in a plane orthogonal to the flow direction in the flow path are arranged along the flow direction in the flow path. A fluid diffusion accelerating device characterized by that.

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