JPH037415B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixer having no mechanically moving parts.

The chemical unit operations covered by mixers are mixing,
There are extraction, gas absorption, emulsification, dissolution, heat exchange, reaction, powdering and mixing, etc., and the applied equipment includes heat exchange equipment, heavy oil (for ships) blending equipment, mixing nozzles for injection molding equipment, organic waste liquid treatment equipment, There are emulsion fuel generation devices, PH adjustment devices, liquid mixing devices, etc.

Conventional mixers have mechanical moving parts within themselves, so they meet all the requirements that have been strongly demanded recently, such as continuous process, labor saving, energy saving, miniaturization of equipment, and maintenance-free. It has been extremely difficult to satisfy this problem, and its application to other fields has been hindered.

The present invention has been made to address these conventional problems by providing an efficient static mixer without mechanically moving parts.
It is designed to be applicable to all fields, and its gist is that baffle plates consisting of a plurality of perforated plates are arranged two-dimensionally facing each other vertically or horizontally within a cylinder that forms a flow path. However, all the baffle plates are arranged at a constant pitch at an angle θ less than 90° with respect to the flow direction, and the baffle plates facing vertically or horizontally are arranged with a constant phase difference in the flow direction. This is a characteristic feature.

Next, the mixer used in the prototype experiment will be explained based on the drawings.

In Fig. 1, reference numeral 1 is a rectangular tube with a fluid passage formed inside, and in the fluid passage, a large number of baffle plates 2 are arranged alternately from above and below or from left and right at appropriate angles. 2 is made of a perforated plate in which a large number of holes 3 are formed at appropriate intervals. More specifically, a plurality of baffle plates 2 are disposed two-dimensionally facing each other vertically or horizontally within a cylindrical body forming a flow path. The baffle plates 2... are all arranged at a constant pitch at an angle θ less than 90° with respect to the flow direction, and the baffle plates facing vertically or horizontally are arranged with a constant phase difference in the flow direction. .

The prototype mixer A (Fig. 1) is made with the following dimensional ratios, for example.

That is, if the length of the side of the rectangular tube 1 is a and the length of the fluid passage is b, then the baffle plate 2 disposed in the fluid passage
are, for example, an angle θ=45° from above and below the fluid passage with respect to the flange 1' of the cylinder 1,
Each baffle plate 2 has a large number of holes 3 with an optimum hole diameter d spaced apart from each other by a/2 pitch as shown in Fig. 3. There is.

FIG. 4 shows an experimental apparatus for testing the mixer A, in which _T1 is a water tank, _T2 is a heavy oil tank, and _T3 is a mixed liquid storage tank. water tank
A pump is installed in the pipeline system between T ₁ and the mixed liquid storage tank T ₃ .
P ₁ , rotor R, and valves V ₁ and V ₂ are provided,
In addition, a gear pump driven by a motor M is installed in the pipeline system between the heavy oil tank _T2 and the mixed liquid storage tank _T3 .
P ₂ , valves V ₃ and V ₄ , and a differential pressure gauge G ₁ provided in the orifice O and the branch pipe, and a pressure gauge G ₂ is provided at the confluence of the water system and heavy oil system pipe.

In order to test mixer A using the test device configured as described above, the flow rates of water and heavy oil flowing through the water system and heavy oil system pipes are controlled by V ₁ , V ₂ and V ₃ , V ₄ respectively. After adjusting the flow rate with rotameter R, differential pressure gauge G, etc., the fluid is merged just before mixer A and introduced into mixer A.
As shown in the operation diagram in the figure, the fluid flowing in the mixer A becomes the main stream due to the entrainment that occurs almost regularly between the main stream S ₁ and the vortex S ₄ and the repeated action of the branch stream S ₂ .
Mixing proceeds while being subjected to shear force by S ₁ and vortex S ₄ , and the jet stream S ₃ ejected from the hole and the shear force acting at the time of entrainment and separation are also added to achieve the optimal mixing action, and finally the outlet Mixed liquid storage tank
Taken out at T ₃ .

The emulsion thus obtained was sampled and photographed, the negative was enlarged, the dispersed particle size was measured, and an experiment was conducted to evaluate the mixing characteristics using the average particle size and particle size distribution.

As a result, the following was found.

(1) Using a prototype mixer, an emulsion average particle size of 20 to 70 μm was obtained at a flow rate of 8 to 12/min (pressure loss: 0.5 to 1.5 Kg/cm ² , Re number: 50 to 110).

...Figure 6 shows the relationship between water content and average particle size.

(2) The relationship between the Weber number and the dimensionless average particle diameter is expressed by the following equation.

Da/Db=0.175We ^-0.75 Da: Average particle diameter Db: Nominal diameter We: Weber number (3) The relationship between the power E applied to the mixer and the dimensionless average particle diameter is expressed by the following equation.

Da/Db=-3.13 lnE+0.094 (4) The emulsion produced by the prototype mixer is
It is expressed by the following formula according to the Rosiin-Rammlar particle size distribution law.

R=e×p{-e×p(-5.13n+7.5× ^10-3 )
Xn} (5) Compared to a honeycomb mixer, which is one of the commercially available static mixers, Re＞90 Power E＞30W
The average particle size of the prototype mixer is smaller.

Good results were obtained.

The present invention is based on the principles and configurations described above, and when put into practical use, it is important to consider the effects of changes in structural parameters, the mixing of liquids other than heavy oil, and the mixing characteristics of powders, gases, etc. Needless to say, it is necessary to conduct basic experiments in order to obtain the optimum condition, taking into consideration the application to applied equipment.

In the experimental example, a case was explained in which a rectangular tube mixer was used, but the present invention is not limited to this, and the shape and dimensional ratio of the mixer can be changed as appropriate depending on the equipment in the subsequent stage to which it is applied. Muru is allowed.

Also, in terms of structure, the number of baffle plates, the number of holes, etc. may be increased or decreased as appropriate.

As described in detail above, according to the present invention, extremely efficient mixing is possible without providing any mechanically movable parts within the container. The purpose of the term can be achieved without fail.

In particular, baffle plates made of perforated plates are placed two-dimensionally facing each other vertically or horizontally at a constant angle θ in the flow direction in the cylinder, and are arranged at a constant pitch to the flow direction, and then facing vertically or horizontally. Since the baffle plates are arranged with a certain phase difference,
Meandering occurs in the flow direction, which separates the main flow and the vortex into two flows, and the mixing action progresses due to the shear force caused by the entrainment action that occurs regularly between the two.

Furthermore, the holes provided in the baffle plate also generate shear forces when passing through this portion, improving efficiency.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic side sectional view of a prototype mixer, FIG. 2 is a front view,
Fig. 3 shows an example of the arrangement of holes in the baffle plate, Fig. 4 is a fluid system diagram of an experimental device using a prototype mixer according to the present invention, Fig. 5 is a diagram of fluid operation inside the mixer, and Fig. 6 is A graph of the water content and average particle diameter of the liquid mixture is shown. In the figure; 1... cylinder, 1'... flange part,
2... Baffle plate, 3... Hole, A... Mixer, G ₁ ...
…Differential pressure gauge, G ₂ …Pressure gauge, M…Motor, P ₁ …
...Pump, P ₂ ... Gear pump, R ... Rotameter, T ₁ ... Water tank, T ₂ ... Heavy oil tank, T ₃
...Mixed liquid storage tank, V ₁ to _{V 4} ...Valve, O
...Orifice chair.

Claims (1)

[Claims] 1 Consists of a cylindrical body that forms a flow path and a baffle plate made up of a plurality of perforated plates disposed two-dimensionally facing each other vertically or horizontally within the cylindrical body, and all of the baffle plates are oriented in the flow direction. A static mixer, characterized in that the baffle plates are arranged at a constant pitch with an angle θ smaller than 90°, and the baffle plates facing vertically or horizontally are arranged with a constant phase difference in the flow direction.