CN113806882B - Determination method of multichannel partition plate of hydrocyclone feeder - Google Patents

Abstract

The invention relates to a method for determining a multichannel separation plate of a hydrocyclone feeder, which comprises a hollow cylinder of the feeder and a feeding body communicated with the periphery of the middle part of the hollow cylinder, wherein flanges are arranged at the upper end and the lower end of the hollow cylinder, the feeding body is provided with a rectangular cross section, and the side wall of the rectangular cross section is formed by the channel separation plate; the device is characterized in that the number of the channel separation plates is n, the feed inlet is divided into n channels, the channel separation plates are in an Archimedes spiral shape with a tapered characteristic, the channel separation plates are arranged anticlockwise, and the head end starts from an equal division point P of each channel _2i‑1 The tail end is tangential to the hollow cylinder at P _2i I is more than or equal to 1 and n is more than or equal to n. The invention has the advantages that: 1) Can be used for all sizes and types of hydrocyclones. 2) The curve of the channel separation plate is tangent to the cylinder, which is favorable for forming rotational flow and meets the requirements of uniformity, smoothness, no bulge and no step. 3) The widths of the channels are the same, so that the symmetry of the flow field is improved, and the separation precision of the cyclone is improved.

Description

A method for determining the multi-channel dividing plate of a hydrocyclone feeder

Technical field

The invention belongs to the technical field of hydrocyclone design, and specifically relates to a method for determining a multi-channel partition plate of a hydrocyclone feeder.

Background technique

Due to its simple structure, no moving parts, small footprint, and simple operation, hydrocyclone is one of the main equipment widely used for material classification and separation in industries such as chemical industry, mineral sorting, environmental protection, petroleum engineering, and bioengineering. one. The classification principle of the hydrocyclone is to use the centrifugal sedimentation principle to separate the materials into products of different particle size levels according to their different sedimentation speeds. That is, the materials enter the cyclone from the cyclone inlet under a certain pressure and generate strong rotational motion. Under the centrifugal force Under the action of fluid drag and centripetal buoyancy, the coarse and heavy particles move outward into the external swirling flow and are discharged from the sand sinking port; under the action of fluid drag and centripetal buoyancy, the fine and light particles migrate inward into the inner swirling flow and are discharged from the overflow port. This completes the classification and separation of particles.

The feeder is the primary channel for materials to enter the hydrocyclone. Research results show that the feeder structure mainly affects the cyclone separation process in three points: 1. The working energy consumption of the cyclone; 2. The cyclone Physical wear; 3. Flow field stability of the cyclone. It can be said that the quality of the feeder structure is one of the key factors that determines the life, flow field distribution and separation performance of the hydrocyclone. The feeder currently widely used in industry is a single-inlet single-channel form. Its advantages are simple and easy processing and convenient on-site configuration. Its disadvantages are high energy consumption, large wear, and uneven feeding, resulting in poor flow field stability. In the study, it was found that The widely recognized feeder form is the symmetrical inlet form, such as double-inlet and four-inlet hydrocyclones. The advantage is that it can effectively solve the problems of single-inlet cyclones, but the disadvantage is that each inlet requires extremely balanced feeding. High, which brings difficulties to the practical application of symmetrical inlet hydrocyclones. In terms of feeder design methods, single-inlet single-channel feeders usually adopt three methods: tangent method, involute method or Archimedean spiral method. Symmetrical inlet-type feeders use a single inlet in a circular shape. Symmetrical design. There are some problems in the current hydrocyclone feeder design methods. For example, although the tangent method is simple to process, the classification performance of the cyclone is poor; although the Archimedean spiral method is more complicated to process, it still has uniform distribution of the feed. There is a problem of poor performance, but the classification performance of the cyclone is better; while the involute method is somewhere in between. Therefore, it is necessary to develop a better design method for hydrocyclone feeders that can not only avoid the problems of single-inlet single-channel and symmetrical-inlet feeders, but also make up for the shortcomings of current feeder design methods.

Contents of the invention

In view of the shortcomings in the structure and design method of the cyclone feeder, the purpose of the present invention is to provide a method for determining the multi-channel partition plate of the hydrocyclone feeder to improve the efficiency of feeding at the cyclone feed port. Balance, thus significantly improving the stability of the flow field in the cyclone and improving the separation accuracy of the hydrocyclone.

The purpose of the present invention is achieved through the following technical solutions:

A method for determining a multi-channel partition plate of a hydrocyclone feeder of the present invention includes a hollow cylinder of the feeder and a feed body connected to the peripheral side of the middle part of the hollow cylinder. The upper and lower ends of the hollow cylinder are evenly spaced. A flange is provided, the feed body has a rectangular cross-section, and the side walls of the rectangular cross-section are composed of channel partition plates; it is characterized in that the design method of the multi-channel partition plate includes the following steps:

Step 1. Determine relevant parameters

Determine the radius R of the hollow cylinder, the entrance width w of the feed body, the extension length L _i of the feed body, the number of channels n of the feed body, and the wrapping angle θ of the feed body;

Step 2. Establish xoy rectangular coordinate system

Taking the center of the cross section of the hollow cylinder as the origin o, taking the line connecting the origin o and the tangent point P ₀ of the feed body and the hollow cylinder as the X axis, taking the origin o and the extension direction of the feed body as the Y axis, establish the xoy right angle Coordinate System;

Step 3. Determine the position of the channel bisection point

Set the width of each channel to be the same, which is Then in the xoy rectangular coordinate system, taking the tangent point P ₀ of the feed body and the hollow cylinder as the base point, determine an equal dividing point every b distance on the X axis, and the equal dividing point coordinates are

Step 4. Create channel dividers

Taking the bisection point P _2i-1 of each channel as the starting point, set it counterclockwise, establish the corresponding channel separation plate according to the Archimedean spiral driving equation with tapering characteristics, and tangent to the hollow cylinder at P _2i ;

Step 5. Taking the tangent point P ₀ between the feed body and the hollow cylinder and the channel bisection point P _2n-1 as the starting point, take the length L along the negative direction of the Y-axis to establish a straight-line segment outer channel, and seal the end points of the outer channel;

Step 6. Taking the channel bisecting point P _2i-1 (1≤i≤n-1) as the starting point, set a straight-line channel partition plate with a length a along the negative direction of the Y-axis in the outer channel.

In step 4, the driving equation of the Archimedean spiral is:

Compared with the prior art, the advantages of the present invention are:

1) The method for determining the multi-channel partition plate of the hydrocyclone feeder of the present invention is based on the single-inlet spiral feed body. Parameters such as the number of channels and wrapping angle can be set according to the actual situation, so it can be used for all Sizes and types of hydrocyclones.

2) The method for determining the multi-channel partition plate of the hydrocyclone feeder of the present invention. The channel partition plate constitutes an Archimedean spiral with tapering characteristics and is completely tangent to the cylinder. Therefore, It contributes to the formation of swirling flow while meeting the requirements of uniform smoothness, no bulges, and no steps.

3) The method for determining the multi-channel partition plate of the hydrocyclone feeder of the present invention, the channel partition plate composition curves are similar, the width of each channel is constant and consistent, and they are all Therefore, it helps to improve the symmetry of the flow field and further improve the separation accuracy of the hydrocyclone.

4) In the method for determining the multi-channel partition plate of the hydrocyclone feeder of the present invention, the entrance of the feed channel is still a single entrance in appearance, which facilitates configuration in practical applications and is more suitable for the actual needs of the production site.

Description of drawings

Figure 1 is a diagram showing the structure and calculation of the hydrocyclone feeder of the present invention.

Figure 2 is a schematic cross-sectional top view of six different cyclone feed channels.

Figure 3 is a vertical section slurry streamline diagram of the cyclone corresponding to Figure 2.

Figure 4 is the sand settling distribution rate curve of different feed channels of the cyclone corresponding to Figure 2.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples.

As shown in Figures 1 to 4, a method for determining a multi-channel partition plate of a hydrocyclone feeder of the present invention includes a hollow cylinder 1 of the feeder and a feed material connected to the central peripheral side of the hollow cylinder 1 body, flanges are provided at the upper and lower ends of the hollow cylinder, the feed body has a rectangular cross-section, and the side walls of the rectangular cross-section are composed of channel partition plates 3; it is characterized in that the multi-channel The design method of partition 3 includes the following steps:

Step 1. Determine relevant parameters

Determine the radius R of the hollow cylinder 1 (same as the column radius of the hydrocyclone), determine the inlet width W of the feed body, determine the number of channels n = 3, and determine the wrap angle θ = 2π.

Step 2. Establish xoy rectangular coordinate system

Take the center O(0,0) of the hollow cylinder cross section as the origin, take the line connecting the origin o and the tangent point P ₀ of the feed body and the hollow cylinder as the X axis, take the origin o and the extension direction of the feed body as Y axis to establish the xoy rectangular coordinate system.

Step 3. Determine the position of the channel bisection point

Set the width of each channel to be the same, which is In the xoy rectangular coordinate system, taking the tangent point P ₀ (R, 0) between the feed body and the hollow cylinder 1 as the base point, then determine the equal division points P ₁ , P ₃ , P every b distance along the positive direction of the X axis ₅ , where P ₁ is the bisection point of the first channel, P ₃ is the bisection point of the second channel, and P ₅ is the bisection point of the third channel; in the xoy rectangular coordinate system, the coordinates are: P ₅ (R+W,0).

Step 4. Create channel dividers

Taking the bisecting point P _2i-1 of each channel as the starting point, set it counterclockwise, and establish the corresponding dividing plate 3 of each channel according to the Archimedean spiral driving equation with tapering characteristics, and tangent to the hollow cylinder 1 at P _2i , the details are as follows:

As shown in Figure 1, according to the xoy rectangular coordinate system, P ₁ is the first channel bisecting point, L ₁ is the first channel dividing plate 3, and P ₂ is the tangent between the first channel dividing plate 3 and the hollow cylinder 1 point. Taking the first channel bisecting point P ₁ as the starting point, the first channel dividing plate 3 is prepared according to the Archimedean spiral. The end of the first channel dividing plate 3 is tangent to the hollow cylinder 1 at point P ₂ .

The Archimedean spiral driving equation involving the first channel divider plate 3 is:

As shown in Figure 1, P ₃ is the second channel bisecting point, L ₂ is the second channel dividing plate 3, and P ₄ is the tangent point between the second channel dividing plate 3 and the hollow cylinder 1. Taking the second channel bisecting point P ₃ as the starting point, prepare the second channel dividing plate 3 according to the Archimedean spiral. The end of the second channel dividing plate 3 is tangent to the hollow cylinder 1 at point P ₄ .

The Archimedean spiral driving equation involving the second channel divider plate 3 is:

As shown in Figure 1, P ₅ is the third channel bisecting point, L ₃ is the third channel dividing plate 3, and P ₆ is the tangent point between the third channel dividing plate 3 and the hollow cylinder 1. Taking the third channel bisecting point P ₅ as the starting point, the third channel dividing plate 3 is established according to the Archimedean spiral. The end of the third channel dividing plate 3 is tangent to the hollow cylinder 1 at P ₆ .

The Archimedean spiral driving equation involving the third channel divider plate 3 is:

Step 5. Taking the tangent point P ₀ between the feed body and the hollow cylinder 1 and the channel bisection point P _2n-1 as the starting point, take the length L along the negative direction of the Y-axis to establish a straight-line segment outer channel 2, and connect the outer channel 2 Endpoint closed.

Step 6. Taking the channel bisecting point P _2i-1 (1≤i≤n-1) as the starting point, set a straight-line channel partition 3 with a length a along the negative direction of the Y-axis in the outer channel 2.

Example 1

In this embodiment, the radius R of the hollow cylinder 1 (the same as the column radius of the hydrocyclone) is 75mm, the inlet width of the feed body, that is, the width W of the outer channel is 30mm, the length L of the outer channel 2 is 100mm, and the number of channels n is 1, and the channel wrap angle θ is 2π.

Embodiment 1 adopts a numerical simulation method to examine the impact of feed bodies with different channel numbers on the separation effect of a hydrocyclone.

Example 2

The difference between this embodiment and Embodiment 1 is that the number of channels n is 2, and the length a of the channel dividing plate 3 is 35 mm.

Example 2 also uses a numerical simulation method to examine the impact of feed bodies with different channel numbers on the separation effect of the hydrocyclone.

Example 3

The difference between this embodiment and Embodiment 2 is that the number n of channels is 3.

Embodiment 3 also uses a numerical simulation method to examine the impact of feed bodies with different channel numbers on the separation effect of the hydrocyclone.

Example 4

The difference between this embodiment and Embodiment 2 is that the number n of channels is 4.

Embodiment 4 also uses a numerical simulation method to examine the impact of feed bodies with different channel numbers on the separation effect of the hydrocyclone.

It can be seen from Figures 2 and 3 that the feed channel designed according to the design method of the present invention can significantly improve the stability of the flow field in the cyclone, fully utilize the performance of the hydrocyclone, and further improve the separation compared with the traditional feed channel. Accuracy. As can be seen from Figure 4, the separation effect of the feed channel of the present invention is equivalent to that of the double-inlet feed channel. Under the same working conditions, the separation particle size is reduced from 22 μm in the traditional feed channel to about 20 μm, and the classification may deviate (E _p =(d ₇₅ -d ₂₅ )/2) is reduced from 7.6μm of the traditional feed channel to about 5μm. That is to say, under the same working conditions, the hydrocyclone of the feed channel of the present invention can significantly improve the classification particle size and accuracy. In addition, the feed channel of the present invention still has a single entrance in appearance, which facilitates configuration in practical applications and is more suitable for actual needs at the production site.

The above are only preferred embodiments of the present invention. It should be pointed out that those skilled in the art can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims (2)

1. A method for determining the multi-channel partition plate of a hydrocyclone feeder, which includes a hollow cylinder of the feeder and a feed body connected to the peripheral side of the middle part of the hollow cylinder. The upper and lower ends of the hollow cylinder are equipped with There is a flange, the feed body has a rectangular cross-section, and the side wall of the rectangular cross-section is composed of a channel partition plate; it is characterized in that the design method of the multi-channel partition plate includes the following steps: Step 1. Determine relevant parameters Determine the radius R of the hollow cylinder, the entrance width w of the feed body, the extension length L _i of the feed body, the number of channels n of the feed body, and the wrapping angle θ of the feed body; Step 2. Establish xoy rectangular coordinate system Taking the center of the cross section of the hollow cylinder as the origin o, taking the line connecting the origin o and the tangent point P ₀ of the feed body and the hollow cylinder as the X axis, taking the origin o and the extension direction of the feed body as the Y axis, establish the xoy right angle Coordinate System; Step 3. Determine the position of the channel bisection point Set the width of each channel to be the same, which is Then in the xoy rectangular coordinate system, taking the tangent point P ₀ between the feed body and the hollow cylinder as the base point, determine an equal dividing point every b distance on the X axis, and the equal dividing point coordinates are/> Step 4. Create channel dividers Taking the bisection point P _2i-1 of each channel as the starting point, set it counterclockwise, establish the corresponding channel separation plate according to the Archimedean spiral driving equation with tapering characteristics, and tangent to the hollow cylinder at P _2i ; Step 5. Taking the tangent point P ₀ between the feed body and the hollow cylinder and the channel bisection point P _2n-1 as the starting point, take the length L along the negative direction of the Y-axis to establish a straight-line segment outer channel, and seal the end points of the outer channel; Step 6. Taking the channel bisecting point P _2i-1 as the starting point, where 1 ≤ i ≤ n-1, set a straight-line channel partition plate with a length a along the negative direction of the Y-axis in the outer channel. 2. A method for determining a multi-channel partition plate of a hydrocyclone feeder according to claim 1, characterized in that, in step 4, the driving equation of the Archimedean spiral is: