Forced vortex suppression strip wing and cyclone dust collector

Abstract

The forced vortex suppression batten wing comprises a first wing piece, a second wing piece and a hanging beam; the first wing piece and the second wing piece are plate-shaped structures, have the same shape and size, have front and back plate surfaces, upper and lower end surfaces and left and right side surfaces, and are symmetrical about a center line connecting the upper and lower end surfaces; the left and right side surfaces comprise arc surfaces, the distance between the arc surfaces and the center line increases gradually from top to bottom; the first wing piece and the second wing piece are combined into one body along the center line; and the hanging beam is installed on the upper end surface. The application also provides a cyclone dust collector, wherein the forced vortex suppression batten wing is installed at the lower end of an exhaust pipe, the side surface of the hanging beam is fully welded and fixed on the inner wall of the bottom of the exhaust pipe, and the forced vortex suppression batten wing extends downward out of the exhaust pipe. The application can reduce the running resistance of the cyclone dust collector.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of energy-saving and environment-friendly dust removal equipment, and relates to a cyclone dust collector, in particular to a forced vortex pressure suppression edge strip wing and a cyclone dust collector. BACKGROUND

[0002] The cyclone dust collector is a kind of dust removal equipment widely used in industry, and has the advantages of simple structure, low cost, work in high temperature and high pressure environment, and high separation efficiency compared with filtration, sedimentation and other separation methods. The cyclone dust collector is a kind of dry gas-solid separation device which separates dust from gas by centrifugal force generated when the dust-containing gas rotates. Because of the simple structure, low operation and maintenance cost, the cyclone dust collector is widely used in industrial dust removal. However, the cyclone dust collector has high resistance, and people have proposed measures to reduce the resistance to different degrees. Many scholars place internal parts (such as air and pressure suppression structure, combined vortex pressure suppression structure, etc.) in the center of the cyclone to reduce the resistance, but at the cost of sacrificing the gas-solid separation efficiency. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a forced vortex pressure suppression edge strip wing and a cyclone dust collector, so as to reduce the pressure loss of the cyclone dust collector on the basis of ensuring the separation efficiency, further reduce the total energy consumption of the cyclone dust collector, and achieve the purpose of energy saving and emission reduction.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0005] A forced vortex pressure suppression edge strip wing, comprising a first wing piece, a second wing piece and a suspension beam.

[0006] The first wing piece and the second wing piece are plate-shaped structures, and have the same shape and size, front and rear plate surfaces, upper and lower end surfaces, and left and right side surfaces, and are symmetrical about the center line of the upper and lower end surfaces; the left and right side surfaces comprise arc surfaces, and the distance between the arc surfaces and the center line gradually increases from top to bottom;

[0007] The first wing piece and the second wing piece are orthogonally combined into one body along the center line;

[0008] The suspension beam is installed on the upper end surface.

[0009] In one embodiment, the lower end surface is a horizontal surface, constituting a cross-shaped wing edge, and the suspension beam is a cross-shaped suspension beam.

[0010] In one embodiment, the cross structure of the cross-shaped suspension beam is projected downward to the lower end surface of the first wing piece and the second wing piece, respectively.

[0011] In one embodiment, the left and right side surfaces converge at the upper end surface and are connected to the center of the cross-shaped suspension beam.

[0012] In one embodiment, the left and right side surfaces are streamlined at the convergence point of the upper end surface to the four vertices of the cross-shaped wing edge of the lower end surface.

[0013] In one embodiment, the vertical distance y of each point on the outer edge of the arc surface to the center line and the length x of the center line satisfy the following relationship, i.e. the linear function of the outer edge of the arc surface of the strip wing is:

[0014] y=y0+αe -x / β

[0015] In the formula, y0 is a constant width of the strip wing base, and its value is 186.986±0.486; α is the strip wing curvature coefficient, and its value is -11.164±0.27; β is the strip wing convergence factor, and its value is -564.146±4.81.

[0016] In one embodiment, the left and right side surfaces further include a vertical surface, the upper part of the vertical surface is connected to the arc surface, and the distance between the vertical surface and the center axis is equal to the maximum distance between the arc surface and the center axis.

[0017] The application also provides a cyclone dust collector, wherein the forced vortex pressure suppression strip wing is installed at the lower end of the exhaust pipe, the side surface of the suspension beam is fixedly welded to the inner wall of the bottom of the exhaust pipe, and the forced vortex pressure suppression strip wing extends downward from the exhaust pipe and has a bottom end located in the cylinder of the cyclone dust collector.

[0018] In one embodiment, the cylinder is composed of a cylindrical cylinder located at the upper part and a conical cylinder located at the lower part, the exhaust pipe extends into the cylindrical cylinder, and the lower end surface of the forced vortex pressure suppression strip wing is located in the conical cylinder.

[0019] In one embodiment, the length of the forced vortex pressure suppression strip wing is determined according to the following formula:

[0020]

[0021] In the formula, x is the length of the center line of the upper end surface and the lower end surface of the strip wing; η is an efficiency factor, and its value is 1.0-1.5; Q is the amount of dust-containing gas processed by the cyclone dust collector; C A is the average flow velocity of the airflow passing through the entire cross section of the cyclone dust collector.

[0022] In one embodiment, the maximum wingspan of the forced vortex pressure suppression strip wing, i.e. the width of the lower end surface, is equal to or 4 / 5-5 / 6 of the inner diameter of the exhaust pipe.

[0023] Compared with the prior art, the forced vortex suppression edge wing structure makes the forced vortex break, and gradually guides the rotating flow path of the forced vortex to transform from rotating flow to axial straight flow, converts part of dynamic pressure into static pressure, thereby reducing the pressure loss of the cyclone dust collector on the basis of ensuring the separation efficiency, further reducing the total energy consumption of the cyclone dust collector, and achieving the purpose of energy saving and emission reduction.

[0024] Experiments prove that, under the premise of ensuring the gas-solid separation efficiency, the operating resistance of the cyclone dust collector can be reduced by about 30% by the present application, thereby reducing the power output of the induced draft fan and other power equipment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram (perspective view) of the forced vortex suppression edge wing structure of the present application.

[0026] Figure 2 It is a schematic diagram (front view) of the forced vortex suppression edge wing structure of the present application.

[0027] Figure 3 It is a schematic diagram (top view) of the forced vortex suppression edge wing structure of the present application.

[0028] Figure 4 It is a schematic diagram (bottom view) of the forced vortex suppression edge wing structure of the present application.

[0029] Figure 5 It is a curve function diagram of the outer edge line type of the arc surface of the edge wing of the present application.

[0030] Figure 6 It is a perspective view of the cyclone dust collector of the present application with the forced vortex suppression edge wing installed.

[0031] Figure 7 It is a simulation comparison of the movement paths of the dust-containing gas in the ordinary cyclone dust collector and the cyclone dust collector with the forced vortex suppression edge wing installed. The left graph shows the movement path of the dust-containing gas in the ordinary cyclone dust collector, and the right graph shows the movement path of the dust-containing gas in the cyclone dust collector with the forced vortex suppression edge wing installed.

[0032] Figure 8 It is a schematic diagram of the verification experiment scene of the present application. The left graph is an example of collecting iron oxide powder by the ordinary cyclone dust collector, and the right graph is an example of collecting iron oxide powder by the cyclone dust collector with the forced vortex suppression edge wing installed. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below with reference to the accompanying drawings and examples.

[0034] In a first aspect of the present application, a forced vortex suppression edge wing is provided, which is used to be installed on the central axis of a cyclone dust collector to reduce the operating resistance thereof.

[0035] AsFigure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown in the figures, the forced vortex suppression edge strip wing of the present application comprises a first wing 1, a second wing 2 and a suspension beam 4; or can also consist of only the first wing 1, the second wing 2 and the suspension beam 4. The above-mentioned components are all made of wear-resistant steel and are fully welded and formed.

[0036] The first wing 1 and the second wing 2 are of the same shape and size, and are of a plate structure. They have front and back plate surfaces, upper and lower end surfaces and left and right side surfaces, and are symmetrical about the center line connecting the upper and lower end surfaces; the left and right side surfaces comprise arc surfaces, the distance of which from the center line gradually increases from top to bottom, i.e. the shape is gradually widened from top to bottom. Thus, a wing shape similar to a "half pistachio nut shape" is formed. The first wing 1 and the second wing 2 are orthogonally combined into an integrated structure along the center line. The suspension beam 4 is installed on the upper end surface, and is used for assembly with a cyclone dust collector.

[0037] According to the structure, the orthogonal combination of the wings and the design of the shape of the left and right side surfaces can break the forced vortex and at the same time guide the forced vortex to transform from rotational flow to axial straight flow, thereby converting part of the dynamic pressure into static pressure, reducing the resistance on one hand and not causing the separation efficiency to decrease on the other hand.

[0038] In the embodiment of the present application, the lower end surface is a horizontal surface, forming a typical cross-shaped wing edge 3. Correspondingly, the suspension beam 4 is a cross-shaped suspension beam. Obviously, the cross structure of the cross-shaped suspension beam is respectively projected downward to the lower end surfaces of the first wing 1 and the second wing 2, i.e. to the cross-shaped wing edge 3.

[0039] The structure of the embodiment makes the edge strip wing on the central axis of the cyclone dust collector cylinder, and this arrangement can effectively suppress the forced vortex. The cross-shaped wing edge 3 can break the vortex of the forced vortex, destroy the rotational flow field thereof and forcibly transform the rotational flow into straight flow.

[0040] In the embodiment of the present application, the left and right side surfaces converge at the upper end surface and are connected to the center of the suspension beam 4.

[0041] The embodiment shows a specific installation form of the suspension beam 4, which is simple and reliable, and only needs to fully weld and fix the four side surfaces of the suspension beam to the inner wall of the exhaust component of the cyclone processor, thereby saving investment or modification costs.

[0042] In the embodiment of the present application, the convergence point of the left and right side surfaces at the upper end surface to the four vertices of the cross-shaped wing edge 3 are all of a streamline circular arc transition.

[0043] The streamline circular arc transition structure of the embodiment can reduce the influence of the edge strip wing on the free vortex field for dust removal, thereby ensuring the dust removal efficiency.

[0044] Furthermore, in this embodiment, the vertical distance y from each point on the outer edge of the arc-shaped surface to the line connecting the centers satisfies the following relationship with the length x of the line connecting the centers, namely, the outer edge profile function of the arc-shaped surface of the edge strip is:

[0045] y = y0 + αe -x / β

[0046] In the formula, y0 is the basic width constant of the leading-edge extension, with a value of 186.986 ± 0.486; α is the radian coefficient of the leading-edge extension, with a value of -11.164 ± 0.27; and β is the convergence factor of the leading-edge extension, with a value of -564.146 ± 4.81. The curve defined by this function can be referenced. Figure 5 As shown.

[0047] In an embodiment of the present invention, the left and right sides may further include a vertical surface, and the upper part of the vertical surface is connected to the arc surface, that is, the vertical surface is below the arc surface. Here, the vertical surface means that the maximum distance between it and the center line is equal to the maximum distance between the arc surface and the center line.

[0048] This structure allows for the formation of a buffer zone after the forced vortex is broken up, enabling some of the kinetic energy of the swirling flow to gradually convert into direct current, while some of the dynamic pressure gradually converts into static pressure, thus avoiding turbulence.

[0049] A second aspect of the invention provides a cyclone dust collector, as referenced. Figure 6 The cyclone dust collector has a vertical exhaust pipe 5, and the aforementioned forced vortex pressing side strip 7 is installed at the lower end of the exhaust pipe 5. Specifically, the side of the suspension beam 4 is fully welded to the bottom inner wall of the exhaust pipe 5, and the forced vortex pressing side strip 7 extends downward out of the exhaust pipe 5 and enters the cylinder 6 of the cyclone dust collector.

[0050] Its working principle is as follows:

[0051] Dust-containing gas enters the cyclone in a tangential manner, and then its movement form becomes a rotating gas flow and moves in a spiral shape from top to bottom, which is called a free vortex. Dust particles complete the gas-solid separation by the centrifugal force of the free vortex. When the free vortex reaches the conical lower end of the cyclone body 6, it will immediately continue to move in a spiral shape in the same rotating direction from bottom to top, which is called a forced vortex. The forced vortex does not play an active role in the gas-solid separation process, but instead increases the operating resistance of the equipment due to the upward movement of the rotating gas flow. In the structure of the present application, when the forced vortex contacts the two mutually orthogonal first wing 1 and second wing 2, the lower end surface structure of the two, such as the cross-shaped wing edge 3, can directly break the forced vortex and force the entire rotating gas flow to change into straight flow movement. That is, the present application suppresses the forced vortex by the arc-shaped edge strip wing conforming to the streamline, changes the original rotating flow movement form of the forced vortex into a straight flow movement form, converts part of the dynamic pressure into static pressure, so as to achieve the purpose of reducing the overall resistance. Experiments have verified that the present application can reduce the resistance of the cyclone by more than 30%.

[0052] In the embodiment of the present application, the length of the forced vortex suppression edge strip wing needs to satisfy that the main body of the forced vortex suppression edge strip wing is located in the cyclone body 6, and the bottom end surface is placed in the conical part of the cyclone body 6. The cyclone body 6 is a structure located below or in the middle and lower part of the exhaust pipe 5, and the upper part is generally cylindrical and the lower part is conical.

[0053] Specifically, the length of the forced vortex suppression edge strip wing is determined according to the following formula:

[0054]

[0055] In the formula, η is an efficiency factor, which is 1.0-1.5; Q is the amount of dust-containing gas treated by the cyclone, V A is the average flow velocity of the gas flow passing through the entire cross section of the cyclone.

[0056] The empirical formula of the present embodiment for calculating the center length x of the edge strip wing can adapt to various occasions with a dust-containing gas treatment amount of 0-100000 m 3 / h.

[0057] In the embodiment of the present application, the maximum wing span of the forced vortex suppression edge strip wing, i.e. the width of the lower end surface, is equal to or 4 / 5-5 / 6 of the inner diameter of the exhaust pipe 5. The center line of the forced vortex suppression edge strip wing is preferably coaxial with the exhaust pipe 5 and the cyclone body 6.

[0058] The parameter setting of the present embodiment can reduce the influence of the edge strip wing on the free vortex flow field for dust removal and ensure the dust removal efficiency.

[0059] The present application will be further described below in combination with a verification experiment.

[0060] AsFigure 7 As shown in the figure, when the 3D printed cyclone model is added with a wind speed of 17.5 m / s, the total pressure of the inlet and outlet is measured by a pitot tube and a inclined differential pressure gauge with a range of 0.3, and the pressure drop calculated thereby is consistent with the numerical simulation results within the allowable error range. The experimental process and results are as follows Figure 8 As shown in the figure, the pressure measurement results are shown in Table 1:

[0061] Table 1 Pressure drop experimental verification results

[0062] Category Inlet total pressure Pa Outlet total pressure Pa Pressure drop Pa Resistance reduction rate % Blank group 12 85 73 — Pressed edge strip wing 15 65 50 31.51

[0063] By observing the flow path of the colored powder and comparing the movement state of the dust-containing gas flow in the cyclone, it is found that the existence of the suppression strip does not affect the movement of the outer vortex, i.e., the free vortex, so it has no absolute influence on the overall action and efficiency of the cyclone. Then, the separation efficiency is quantitatively calculated by using the trapped and escaped particles, as shown in Table 2.

[0064] Table 2 Separation efficiency experimental verification results

[0065] Category Total dust mass g Separated dust mass g Separation efficiency % Blank group 10.0 7.62 76.18 Pressed edge strip wing 10.0 9.00 89.80

[0066] Accordingly, in the same specification cyclone, under the premise of ensuring that the dust removal efficiency does not decrease, the forced vortex suppression strip wing can reduce the running resistance of the cyclone by more than 30%.

Claims

1. A forced vortex suppression strake wing, characterized by, It comprises a first wing (1), a second wing (2) and a suspension beam (4); The first wing (1) and the second wing (2) are plate-shaped structures, have the same shape and size, have front and back plate surfaces, upper and lower end surfaces, and left and right side surfaces, and are symmetrical about a center line connecting the upper and lower end surfaces; the left and right side surfaces include arc surfaces, distances of the arc surfaces from the center line gradually increase from top to bottom, and vertical distances of outer edges of the arc surfaces from the center line lengths of the arc surfaces from the center line satisfy the following relationship, i.e., a line type function of an outer edge of the arc surface of the side strip wing is In the formula, is a constant for the width of the girt wing base, and has a value of 186.986±0.486; is a coefficient for the curvature of the girt wing, and has a value of -11.164±0.27; is a convergence factor for the girt wing, and has a value of -564.146±4.81; the left and right side surfaces further comprise a vertical surface, an upper portion of the vertical surface being connected to the arc-shaped surface, the distance between the vertical surface and the center line being equal to the maximum distance between the arc-shaped surface and the center line; The first wing (1) and the second wing (2) are combined into one body along the center line, and the lower end surface is a horizontal surface, forming a cross-shaped wing edge (3); The suspension beam (4) is installed on the upper end surface, and the suspension beam (4) is a cross-shaped suspension beam, and the left and right side surfaces converge at the upper end surface and are connected to the center of the cross-shaped suspension beam (4).

2. The vortex-suppressing strake wing according to claim 1, characterized in that The cross-shaped structure of the cross-shaped suspension beam is projected downward to the lower end surface of the first wing (1) and the second wing (2) respectively.

3. The vortex-suppressing strake wing according to claim 1 or 2, characterized in that The convergence points of the left and right side surfaces at the upper end surface to the four vertices of the cross-shaped wing edge (3) at the lower end surface are all streamlined circular arcs.

4. A cyclone separator characterised in that, A forced vortex suppression edge strip wing according to any one of claims 1 to 3 is installed at the lower end of the exhaust pipe (5), wherein the side surface of the suspension beam (4) is fully welded and fixed to the inner wall of the bottom of the exhaust pipe (5), the forced vortex suppression edge strip wing extends downward from the exhaust pipe (5), and the bottom end is located in the cylinder (6) of the cyclone dust collector, the cylinder (6) is composed of a cylindrical cylinder at the upper part and a conical cylinder at the lower part, the exhaust pipe (5) extends into the cylindrical cylinder, and the lower end surface of the forced vortex suppression edge strip wing is located in the conical cylinder, the length of the forced vortex suppression edge strip wing is determined according to the following formula: In the formula: is the length of the center line of the upper end surface and the lower end surface of the wing of the side strip; is an efficiency factor, with a value of 1.0-1.5; is the amount of dust-containing gas treated by the cyclone dust collector; is the average flow velocity of the gas flow along the entire cross section of the cyclone dust collector.

5. The cyclone separator of claim 4, wherein The maximum wing span of the forced vortex suppression edge strip wing, i.e. the width of the lower end surface, is equal to the inner diameter of the exhaust pipe (5) or is 4 / 5-5 / 6 of the inner diameter.

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