JP2001113148A - Stationary mixer and deoxidation system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the flow rate at the outer part in the diameter direction the same with the flow rate at the inner part in the diameter direction so as to increase the flow rate of the fluid flowing in a diameter direction in order to improve mixing efficiency. SOLUTION: The basic mixing unit of a stationary mixer 10 is constituted of a first plate-shaped members 71 and a second plate-shaped members 72. The first recessed part 101 of the first plate-shaped member 71 and the second recessed part 102 of the second plate-shaped member 72 satisfy the following conditions. (A) The first and second recessed parts 101 and 102 have open parts on the surface of each plate-shaped member 71 and 72. (B) The inner wall of each recessed part 101 and 102 becomes deeper as the wall approaches to the center of the recessed parts 101 and 102 from the edge of the open part. (C) The inner wall of each recessed part 101 and 102 is a curved surface smoothly continuing from the edge of the open part. Preferably, the open area of the open part of each recessed part 101 and 102 is made smaller toward the outside of the diameter direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the flow of fluids to be treated (at least two or more fluids, including liquids and gases, and powders) to be mixed and processed with each other. The present invention relates to a static mixing device that performs a mixing action by passing through a passage, and a deoxidizing system for effectively removing dissolved oxygen in a liquid to be treated by using such a static mixing device.

[0002]

BACKGROUND OF THE INVENTION For example, Japanese Patent Publication No. 59-39173 discloses one such static mixing apparatus.
Japanese Patent Application Laid-Open No. 9-38660 discloses a method in which an inert gas such as nitrogen is mixed into a liquid to be treated in the form of bubbles, and the dissolved oxygen and the inert gas are brought into contact with each other to displace the dissolved oxygen. Shows a technique for removing the. There, a basic mixing unit is configured using two large and small disks. On one surface of one disk, there are a plurality of honeycomb-shaped first recesses, and on the other disk, similar honeycomb-shaped second recesses are distributed in a slightly shifted position. are doing. When the two discs are superposed such that the recesses face each other and one of the recesses communicates with a plurality of the other recesses, a flow path is formed between the discs so as to communicate sequentially in the radial direction.

[0003] In such a basic mixing unit, the fluids to be mixed with each other are moved from one inside of one of the recesses while moving from the radial inside to the outside or vice versa. Dispersion into a plurality of the other recesses and further dispersion from each of the other dispersed recesses to a plurality of the one recesses are sequentially repeated. Thus, as the dispersion grows and the total number of dispersions reaches the molecular level, the mixing performance thereby is so large that other mixing devices such as mechanical agitators cannot be obtained. This large mixing performance enhances the contact efficiency between the inert gas and the dissolved oxygen even in the deoxidizing system, and produces an effective deoxidizing action.
Of course, by stacking a plurality of mixing units, the mixing performance can be further increased.

[0004]

By the way, in the conventional static mixing apparatus, the flow of the fluid flowing into each of the recesses collides with the inner wall of each of the recesses and is complicatedly reversed to form a vortex. The design philosophy was such that the flow was disrupted in the recess. That is, in general, each recess is formed in a honeycomb shape, and is composed of a side wall that stands vertically on a disk and a bottom wall that is orthogonal to the side wall, and has a shape in which the bottom and the side wall have corners, In some cases, a projection is provided at the center of the bottom wall, and the projection actively causes turbulence due to the flow of the fluid.

However, based on such a design concept,
While the mixing action is effectively performed in each recess, there is a disadvantage that the fluid tends to stay in the recess. Then
As a whole, the flow velocity of the fluid flowing in the radial direction decreases. Therefore, the flow velocity when flowing from each recess of one disk to the plurality of recesses of the other disk is also small,
There is also a problem that the shearing action on the flow flowing out of the concave portion of one disk is reduced, and the energy of the flow flowing into the concave portion of the other disk is also reduced, resulting in a decrease in the mixing efficiency of the fluid. . In addition, with a structure having corners inside each recess, it is difficult to clean the inside of the recess when cleaning the mixing unit. Problem also arises.

[0006]

The present invention takes the idea that the flow rate of the fluid flowing in the radial direction should be increased in order to increase the mixing efficiency. Based on this concept, a design concept is adopted in which each recess should not have a shape or structure that impairs the flow of the fluid, and should have a configuration in which the fluid can easily flow. The design concept of the present invention is a completely new concept of preventing the recess itself from obstructing the flow, unlike the conventional idea that the shape of the recess itself disturbs the flow. Also in the present invention, the basic mixing unit is constituted by the first and second two plate-like members. Here, the reason why the plate-shaped member is used is that the shape of the plate is not limited to a circle. A circular shape is preferable in view of a surface that easily seals the outer peripheral portion of the plate, but the plate may be polygonal. The first and second plate-like members are each provided with a first plate on at least one surface thereof.
And each of the second recesses, the sides of the respective recesses are opposed to each other, and the recesses of one plate-like member are overlapped so as to communicate with a plurality of recesses of the other plate-like member. A flow path is formed between the members so as to sequentially communicate in the radial direction through the first recess and the second recess.

According to the new design concept described above, according to the present invention, the first recess of the first plate-like member and the second recess of the second plate-like member satisfy the following conditions. . A. The first and second recesses have openings on the surface of each of the plate members. B. The inner wall of each of the recesses gradually becomes deeper from the edge of the opening toward the center of the recess. C. The inner wall of each of the recesses has a smoothly continuous curved surface from the edge of the opening.

The first and second recesses should preferably have a shape that does not have directivity over the entire circumference, such as a regular polygon or a circle, when viewed from the surface of each plate member. Most preferably, each recess has a circular opening. Also,
The inner wall of each recess can be provided at a position where the deepest portion is shifted from the center, but is preferably symmetrical about the center. In that respect, polishing and processing can be facilitated by forming the inner wall into a partially spherical shape.

Further, since the recesses are distributed on the surface of each plate-like member, the number of recesses on the outer side in the radial direction is larger than that on the inner side in the radial direction. Therefore, as in the past, when the shape of each recess is made the same and uniformly distributed on the surface of each plate-like member, one of the first and second recesses becomes the same as the other recess. The area of the flow passage at the place communicating with the plurality increases toward the outside in the radial direction. Along with this, the flow velocity of the radial flow tends to decrease on the radially outer side compared to the radially inner side. For effective shearing of the flow, it is preferable to increase the flow velocity. In this regard, it is preferable that the flow velocity on the outer side in the radial direction is equal to the flow velocity on the inner side in the radial direction. As a specific means for realizing this, a method of reducing the opening area of the opening of each recess toward the outside in the radial direction, further, the curvature of the inner wall surface of the recess following the closed edge, or the recess There is a method of increasing the flow resistance of the fluid flowing into and out of the concave portion in the radially outer concave portion by changing the depth of the concave portion.

The static mixing device according to the present invention can be used alone as a mixing device, but is effectively used as a mixing device for mixing and contacting an inert gas with a liquid to be treated in a deoxygenating system. Can be applied.

[0011]

FIG. 1 is a sectional view from the front of a stationary mixing apparatus 10 in which mixing units are stacked in multiple stages, and FIG. 2 is a side view as viewed from the left in FIG. Stationary mixing device 10
Has a mixing unit stacked in multiple stages between a pair of end plates 20 and 30. The number of radial channels is 12 steps. One of the pair of end plates 20 and 30 serves as an inlet for introducing the fluid to be mixed, and the other serves as an outlet for discharging the fluid after the mixing. At the center of each of the end plates 20, 30, there are connecting pipes 20a, 30a for introducing or discharging a fluid, and connecting the pipes of the line to the connecting pipes 20a, 30a by a clamp 40 or the like. become. Therefore, it is easy to attach the mixing device 10 in the middle of the line or to remove it from the line. Further, each of the end plates 20 and 30 can sandwich and support an appropriate number of the mixing units by a screw rod 50 hinged to one side and a wing nut 55 screwed to the screw rod 50. Screw rod 50-Wing nut 5
The set of five is three separated in the circumferential direction, and the work of tightening or loosening the screws is easy.

The mixing unit supported by both end plates 20 and 30 basically has a first plate-like member (disk) 71 having a large central through hole 60 at the center and a small peripheral communication at the peripheral portion. A second plate-shaped member (disk) 72 having a plurality of holes 80 can be used. In the illustrated embodiment, the first and second plate-like members 71 and 72 are used.
However, it has a plurality of recesses on both sides parallel to each other. Therefore, in order to sequentially configure the radial flow paths, a first plate-shaped member (disk) 71 having a center through hole 60 is divided into two parts at portions adjacent to the end plates 20 and 30. Three plate-like members 73 are arranged.

Here, please refer to FIG. 3 to FIG. FIG. 3 is a plan view of a first plate member 71 having a center communication hole 60, FIG. 4 is a plan view of a second plate member 72 having a peripheral communication hole 80, and FIG. It is a figure showing the state where both 1st and 2nd plate-like members 71 and 72 were overlapped. The first plate-like member 71 has a flange 7 on the outer peripheral portion.
1f, an O-ring 90 is provided on the inner peripheral portion of the flange 71f.
And a ring groove 71d for mounting the same. And the first
The plate-shaped member 71 further includes an inner periphery of the ring groove 71d,
The portion facing the peripheral communication hole 80 on the side of the second plate-shaped member 72 has a concave portion 98 extending over one circumference, and a plurality of first concave portions 101 at an inner peripheral portion of the concave portion 98. On the other hand, the second plate-shaped member 72 is large enough to fit into the inner periphery of the flange 71f of the first plate-shaped member 71, and has a peripheral communication hole 8 in a peripheral portion.
0, the first plate-like member 71 side first region
A plurality of second recesses 102 similar to the recess 101 are included.

In order to increase the total number of dispersion, the first plate-like member 71 and the second plate-like member 72 are placed in a state where the first plate-like member 71 and the second plate-like member 72 are overlapped with each other.
It is necessary to set the position of one of the recesses 02 so that a plurality of the other recesses communicate with each other. For this purpose, it is necessary to distribute the recesses 101 and 102 on the plate members 71 and 72 in a form in which the positions are slightly shifted from each other, and to properly align the plate members 71 and 72 with each other. It is. The former can be achieved by shifting the distribution form of one of the recesses and the other. The shifting direction is the circumferential direction and / or the radial direction of both plate-like members 71 and 72. For the latter,
This can be achieved by positioning the two plate-like members 71 and 72 in the circumferential direction and / or the radial direction.
In this regard, in the embodiment shown in the drawing, the second plate-shaped member 72 is fitted to the inner periphery of the flange 71f of the first plate-shaped member 71, so that the two plate-shaped members 71, 72 are radially aligned. Further, by fitting a pin 92 provided on the outer periphery of the second plate-shaped member 72 into a semicircular cutout hole 91 in a flange 71f portion of the first plate-shaped member 71, The shape members 71 and 72 are aligned in the circumferential direction. In order to seal the inside of the stationary mixing device 10, the first and second plate members 71 and 72, the third plate member 73, and the end plates 20 and 30 which are superimposed on each other are provided. An O-ring 90 is provided.

FIG. 6 is a partially enlarged view of the state in which the first and second plate-like members 71 and 72 in FIG. 5 are overlapped. Recess 1
The relationship between 01 and the second recess 102 on the second plate-shaped member 72 side is clarified. The hatched portions in the drawing are portions where the first recess 101 and the second recess 102 communicate with each other. As can be seen from this figure, the circular recesses 101,
When uniformly distributing 102, the number of recesses 101 and 102 is greater on the radially outer side than on the radially inner side. For this reason, each of the recesses 101, 1
If the size and the degree of overlap of the opening portion 02 are the same, the flow passage area of the communicating portion is entirely (in the circumferential direction as a whole) on the radially outer side than on the radially inner side.
And the flow velocity will decrease. In order to eliminate the difference in flow velocity between inside and outside in the radial direction, here,
The diameter of each of the recesses 101 and 102 is smaller on the radially outer side than on the radially inner side. Thereby, the flow path area of the above-mentioned communication portion is made substantially the same as a whole at different positions in the radial direction of the first and second plate-like members 71 and 72.

As shown in the sectional view of FIG. 1, the first recess 101 and the second recess 102 each having a circular opening are partially spherical, and the inner wall of each recess 101, 102 ,
It has a smoothly continuous curved surface. This is for smoothing the flow inside each of the recesses 101 and 102 and minimizing the stagnation of the flow therein. Each recess 10
As for the members 1 and 102, not only the diameters inside and outside the plate members 71 and 72 in the radial direction are changed, but also as shown in another enlarged sectional view of FIG. Can be changed (the depth becomes shallower toward the outside in the radial direction).

FIG. 8 shows the static mixer 10 described above.
It is a figure which shows an example of a deoxidation system using (1). Nitrogen gas is introduced into the raw water supplied by the pump 110, and the nitrogen water is mixed using the stationary mixing device 10,
This is a system that removes oxygen from the raw water. Because the static mixer 10 itself has excellent mixing performance,
The circulation unit itself connected to the mixing unit for performing the mixing process can be omitted. The static mixing device 10 can be easily integrated into the line of such a system,
Deoxygenation can be performed effectively.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of the embodiment of FIG.

FIG. 3 is a plan view of a first plate member.

FIG. 4 is a plan view of a second plate member.

FIG. 5 is a view showing a state in which first and second plate-like members are overlapped.

FIG. 6 is a partially enlarged view of FIG. 5;

FIG. 7 is an enlarged partial cross-sectional view showing a modification.

FIG. 8 is a diagram showing an example of application to a deoxidation system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Static mixing apparatus 20, 30 End plate 60 Center through-hole 71 1st plate-shaped member 72 2nd plate-shaped member 80 Peripheral through-hole 101 1st recess 102 2nd recess

Claims (7)

[Claims] 1. A first plate-like member having two surfaces parallel to each other and including a plurality of first recesses on at least one surface portion of the two surfaces; Similarly, a plurality of second planes having two planes parallel to each other and distributed on at least one of the two planes in a form displaced from the first recess on the side of the first plate-shaped member. There is a second plate-like member including two recesses, and the first and second plate-like members are arranged such that the sides of the respective recesses face each other, and one of the first and second recesses is the other. Overlap so that it communicates with a plurality of recesses,
A static mixing device including at least one mixing unit that constitutes a flow path that sequentially communicates in a radial direction through the first recess and the second recess between the two plate-shaped members; 2. The static mixing device, wherein the two recesses satisfy the following conditions. A. The first and second recesses have openings on the surface of each of the plate members. B. The inner wall of each of the recesses gradually becomes deeper from the edge of the opening toward the center of the recess. C. The inner wall of each of the recesses has a smoothly continuous curved surface from the edge of the opening. 2. A flow path area where one of the first and second recesses communicates with a plurality of the other recesses at different radial positions of the first and second plate members. The static mixing device of claim 1, wherein the mixing device is substantially the same. 3. The number of the recesses of the first and second plate-like members formed in the circumferential direction increases radially outward of each of the plate-like members, and further, the number of the openings is increased. 3. The static mixing device according to claim 2, wherein the opening area of the static mixing device is reduced. 4. The static mixing apparatus according to claim 3, wherein an opening of each of said recesses is circular, and a diameter thereof becomes smaller toward a radially outer side of each plate-shaped member. 5. The method according to claim 4, wherein each of the first and second recesses has a partially spherical shape, and a depth of the first and second recesses becomes smaller toward a radially outer side of each plate-shaped member. Stationary mixing device. 6. A deoxygenating system for removing dissolved oxygen in a liquid to be treated by mixing an inert gas into the liquid to be treated, comprising: a pump for supplying the liquid to be treated; A deoxygenating system comprising: a static mixing device for mixing and bringing an inert gas into contact with a liquid to be treated supplied by a pump, wherein the static mixing device has the following configuration and features. That is, a first plate-like member having two surfaces parallel to each other and including a plurality of first recesses on at least one surface portion of the two surfaces, and a first plate-like member similar to the first plate-like member. A plurality of second recesses having two parallel surfaces and distributed on at least one surface portion of the two surfaces in a form shifted from the first recess on the side of the first plate-shaped member. And the first and second plate-shaped members are arranged such that the sides of the respective recesses are opposed to each other, and one of the first and second recesses is the other of the other recesses. It is overlapped so as to communicate with a plurality, and between the two plate-shaped members, at least one mixing unit forming a flow path that sequentially communicates in the radial direction through the first recess and the second recess is provided, and The first and second recesses satisfy the following conditions. A. The first and second recesses have openings on the surface of each of the plate members. B. The inner wall of each of the recesses becomes gradually deeper from the edge of the opening toward the center of the recess. C. The inner wall of each of the recesses has a smoothly continuous curved surface from the edge of the opening. 7. A flow path area at a location where one of the first and second recesses communicates with a plurality of the other recesses at different radial positions of the first and second plate members. 7. The deoxygenation system of claim 6, wherein the system is about the same.