JPS6078628A - Liquid mixing method and apparatus - Google Patents

Abstract

PURPOSE:To rapidly and uniformly mix an extremely small amount of a liquid with a large amount of liquid flowing through a pipeline without applying energy from the outside, by utilizing stirring and mixing action generated when the mechanical energy of the liquid in the pipeline is lost. CONSTITUTION:A pipeline 3 is provided in a pipeline 1 to divide said pipeline 1 into a flowline having an opening directed to the upstream of the pipeline through which the small part of a large amount of a liquid and a flowline through which the greater part of said liquid is flowed. In a pre-mixing part comprising said pipeline 3, an extremely small amount of a liquid is mixed into the flowline, through which the aforementioned small part is flowed, and both liquids are mixed by stirring action based on the friction in both liquids and the friction between the liquids and a solid surface. Next, in a mixing part, a flow reducing part 6 is adequately provided to the stream occupying the greater part of a large amount of the aforementioned liquid to generate an accelerated stream and the liquids mixed in the aforementioned pre-mixing part 3 are flowed into and mixed with the liquid in said pressure reduced part. By this method, an extremely small amount of the liquid can be rapidly and uniformly mixed with a large amount of the liquid flowing through the pipeline without applying energy from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for mixing a small amount of liquid with a large amount of liquid flowing through a conduit.

Except for special cases in which molecular diffusion has a high degree of contribution, in the case of liquids, it is caused by stirring.

Generally, in order to mix a small amount of a substance into a large amount of substance, it is often insufficient to simply add and stir the two. One of the reasons for this is that small amounts of substances tend to localize in a part of large amounts of substances or in the molten furrows due to adsorption, adsorption, dissolution, or non-uniform stirring; This is because it takes time for a small amount of material to be mixed uniformly into a large amount of material, which impairs so-called earlyness.

In the case of mixing powder and granular materials, for example, in order to add trace ingredients to pharmaceutical preparations, food F1, feed, and feedstuffs, the trace ingredients are first mixed into the center of the main ingredients by premixing or first-stage mixing. ), then stir and mix this mixture with most of the main ingredients (
Main mixing or second stage mixing) is widely practiced. (There is a theory that stirring and mixing both mean "stirring," and that the former is used for fluids and the latter is used for solids. However, McCabe (!:
8nith is his book Llnit 0peratio
ns of (hcmical engineerin
g, McGry-Hill (1976) states that stirring is caused by movement induced in substances, such as circular movement within a container, and mixing refers to the random distribution of two or more substances. . Pure water does not mix no matter how much you stir it, so it follows the latter definition.O) Stirring and mixing of powder and granules is always done by applying energy from the outside. Figure 1 shows the agitation mixing of powder and granular materials replaced with liquid mixing, and shows Bl, B2
are the first and second stage mixers, respectively,
Stirring is performed by agitators AI and A2. A large amount of liquid is
It flows through the pipe along the arrow, and its central part passes through pipe 1b*-, mixes with a small amount of liquid directly entering from pipe (2) in mixer Bl, and further flows through pipe in mixer B2. Two-stage mixing is performed by mixing with the remaining large amount of liquid that enters through 1a. 1. If complete back-mixing is performed in mixers Bl and B2, and assuming that there is a common flow in the pipes, this system will be Since it is easy to understand analytically, it is convenient to think of it as an idealized model of the longitudinal method.

However, in the case of liquid flowing through a pipe, mixing necessarily occurs when mechanical energy is lost due to friction within the liquid or between the liquid and the pipe wall, so it is not necessary to apply any particular energy from the outside. Furthermore, the extent to which mechanical energy contributes to mixing, that is, the energy efficiency, is greater in the case of friction within the liquid than in the case of friction with the tube wall.

The purpose of the Xylem BI is to provide a method and apparatus for quickly and uniformly mixing a small portion of liquid into a large liquid flowing through a conduit without applying external energy.

Here, a very small amount is approximately 10-1 to 1103p.
Although it means about p, it is not limited to this number.

Kibe 81j's method utilizes the stirring and mixing action that accompanies mechanical energy loss within the pipeline, and essentially performs two-stage or multi-stage mixing without applying external mechanical energy (power). Let it happen. However, the device of the present invention
This is the device used for this.

The structure of the present invention will first be explained using a nine-embodiment apparatus illustrated in FIG.

+ll is a pipe through which a large amount of liquid flows, tt+fl is a pipe for a small amount of liquid to be mixed with this pipe 6L+:n is a preliminary (or first stage) mixing section (B1 in Fig. (4) is a jetting nozzle for low ptI liquid, and (5) is a baffle plate. Assume that the liquid flows in the direction of the arrow. When a small amount of liquid is ejected from the nozzle (4), the pipe expands lazily, so the liquid is stirred and mixed with less friction with the wall. This stirring and mixing progresses further as the liquid advances in the direction of the arrow (downstream), exits the premixing section (3) and hits the baffle plate +51, whereupon the mixing progresses further and the gap (6 ) (Pipeline 11
) and the annular cavity formed by the baffles (5) and (d). At this time, in this gap (6), the flow on the large fat: liquid side is constricted, so the premixing is performed in the premixing section.
A small amount of liquid is sucked out and mixed into a large amount of liquid, and the main mixing (two-stage mixing) becomes a homogeneous mixture.
flows downstream.

That is, in this example, a small amount of liquid and a relatively small amount of large liquid are first mixed using the preliminary mixing section (3), and this is mixed with the remainder of the large amount of liquid in the gap (6) (main mixing section). ) (It goes without saying that the speed and uniformity of mixing will further increase if the mixing is performed in multiple stages by sequentially installing the 1st stage mixing section, 2nd stage mixing section, and 3rd stage mixing section) The premixing section (3) in this example is constructed with a Venturi tube trr, which reduces mechanical energy loss by 4μ within the tube. It can be advantageously applied to things.

In this example, the stirring state is mainly caused by the ejection nozzle part of the small liquid (rapid expansion of the pipe) and the change in the direction of the liquid flow in the flow part of the baffle plate (6). It should be noted that in both cases, the importance of rubbing inside the C1 liquid is higher than in the direct case, and the energy efficiency for stirring is lower.

Note that in this example and the following examples, the direction of the liquid flow is shown horizontally, but the direction is not limited to this.
It goes without saying that there is no problem in any direction, such as vertical or oblique (as is well known, the vertical direction is advantageous in that there is less drifting). In addition, the premixing section (3)
Of course, it is also possible to provide the same effect as this embodiment by providing the necessary piping outside the pipe line.

As described above, it is clear that the embodiment shown in FIG. 2 allows two-stage mixing to be carried out by the mechanical energy of the liquid in the bamboo path without applying external mechanical energy.

Next, as shown in FIG. 3, an example of a mechanism for dividing a large amount of liquid into a preliminary mixing section (a small portion) and a main mixing section (a large portion) will be shown using an example.

In this embodiment, the baffle plate (6) in the embodiment of FIG.
is attached as an annular plate to the upstream end (inlet end) of the pre-(q11 polymerization section (3)), and the pre-mixing Its< (s
) has a lid-like body 3a with a free crown. Thus, the IC is configured such that premixing is performed throughout the premixing section (3), the passage (3b), and the passageway (3c). Baffle board (5)
The annular gap (6) between the Ivf path and the Ivf path +1) is a major flow restriction for the majority of the liquid, causing a pressure drop in this section and premixing and running into the downstream contraction section. Main mixing is performed by sucking in a small portion of the liquid. By adjusting the area of the gap (6), large 1+1. The ratio of the major part to the minor part of the liquid is 7 Ry! However, the gap (6) does not need to be annular and continuous. On the contrary, if this inlet channel is made 2-fold taller and 1' taller and flatter, its circumference is made larger, and the equivalent diameter is made smaller, the flow length required for mixing is increased. is shortened, and the length of the device jP1 in the flow direction can be shortened.
It is also desirable to apply C.

In addition, in this example, the main causes of energy loss are sudden expansion of character (nozzle part that outputs a small amount of fluid I!#) and change of direction (tracing his Lll, same (3b),
Passing through the same (3c) and exit road (3d) one after another)
It has high energy efficiency.

Next, in the embodiment shown in FIG. 4, most of the passages for the bulk liquid are of a helical structure, which creates the necessary pressure drop and also allows the bulk of the liquid to pass through the gap 16). A swirling motion is applied to the gap (6), further increasing the effect of main mixing near the gap (6). Other structures are similar to those shown in Figure 2 and Daido Ozawa.

In the embodiment shown in FIG. 5, the premixer (3) consists of an upstream tubular cap (3a) and a downstream bulge (3b).
There is C. The bulging part (3b) causes a large amount of circulation (arrow) including a flow in the opposite direction in this part to cause back mixing,
This is to cause a temporal equalization effect of the concentration phenomenon when a very small amount of the liquid is fed from a reciprocating pump or the like and there is pulsation. In addition, in this embodiment, from the premixing section (3) to the main mixing section (6)K, a passage (6a) through which a mixture of a very small amount of liquid and a small amount of large m liquid is sent out.
Note that is not a single hole but multiple holes.

Next, in the embodiment shown in FIG. 6, the bulge portion (3b
) is provided with 1 filling R (a) at °C. Instead of a packed bed, one or several perforated plates can be installed, and baffles can be installed in a segmented or dokunut type, but in order to equalize the concentration over time. It is. In both the embodiments shown in FIGS. 5 and 6, it is not impossible to predict that there is no problem with incomplete back-mixing rather than complete back-mixing.

Furthermore, the so-called ink bottle effect (by providing an ink bottle-shaped bump in the conduit, the time delay required for diffusion between the bottle and the conduit can equalize the fluid concentration in the +1' line over time). It is also possible to take advantage of the effect of raising the level of the air, and further add a leveling effect.

Figure 7 shows 1. In this embodiment, in the conduit (1), an axial flow turbine Jli, +111 is installed downstream of the premixing section (3) and the 319 liver plate (6), and coaxially therewith, In addition, a six-structure structure is used in which a gear speed increasing device (I44), for example, a gear speed increasing device (G) is used to increase the speed, and a pre-mixing section (m, stirring option) is connected to the shaft. (1)
The mechanical energy of the body in the turbine BT, f
, 1 rll, the transmission pipe 7 and the spiral stirring liquid are rotated so as to stir the inside of the C1 premixing section (3) and mix the mixture. It is possible to stir and move the liquid downstream at the same time, and this active stirring allows for faster and more thorough mixing than stirring solely by the mechanical energy of the liquid. That's all I can say. 11 at the paddle point using external power
I want to be understood.

In the method of the present invention, furthermore, (a) in the reserve and joint,
Parallel to the pipeline +1) and in the 5th direction of Shimoura (left direction in the figure)
Various modifications are possible by providing passages in which the direction of flow is alternately changed in the upstream direction (to the left in the figure), or by approximating part of these passages to a back-mixing type.
Complicating the passageway improves the fit, but it is often not a good idea because it tends to increase sacral compression.

As is clear from the above explanation, in order to mix a very small amount of liquid into a large amount of liquid, the xylem 1
1. A method of mixing a small amount of 6-ammonium with a small amount of liquid and heating the generated preliminary 9-ammonium into a large portion (Q amount) of large m liquid (further multiplicity if necessary) and Part 4 It is related to sieve, and requires only the mechanical energy of the liquid without supplying energy from outside. The mixing is not only quick and uniform, but also reliable and safe since no power machinery is used.

Since the mixing is done quickly, it is effective in preventing corrosion when a corrosive liquid is used as a small amount of liquid.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional method, and FIGS. 2, 3, 4, 5, 6, and 7 are examples showing different embodiments of the present invention. . 11)...Pipeline, (2)...Pipeline for small amount of liquid, +3
10.・Preliminary (first stage) mixing section, (4)... small amount liquid jet nozzle, (5), (6)... baffle plate, (6)...
・Gap (main mixing part), (a)... spiral passage, (cave...
- Packed bed, hr+...Turbine, (lit)...Stirrer, Al...Premixer stirrer, A2...Main mixer stirrer, B1...Premixer, B2...・This mixer. Applicant Sasakura Machinery Co., Ltd. Figure 1 Figure 2 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] 1. When mixing a very small amount of liquid with a large amount of liquid flowing through a pipe: The very small amount of liquid is mixed in the center of the large amount of liquid, and the mixed liquid is mixed into the large amount of liquid. A liquid mixing method in which the mechanical energy of the liquid is used to mix it into most of the remaining liquid without consuming external force. 2. When mixing a very small amount of liquid with a large amount of liquid flowing through a pipe: (a) The large liquid is mixed into a flow path whose central part has an opening facing upstream of the pipe, and the remaining large liquid. and (b) a device that divides the liquid into a flow path through which the central portion flows, and (b) a premixing device in which a very small amount of the liquid is introduced into the flow path through which the central portion flows and is mixed by a stirring action based on liquid friction and friction between the liquid and the solid surface. and (c) Main mixing in which a condenser section is appropriately provided in the flow of most of the large amount of liquid to generate a high-speed flow, and the liquid mixed in the preliminary section is flowed and mixed into this low-pressure section. A liquid mixing device comprising: 3. The liquid mixing device according to claim 2, wherein the premixing section includes a structure in which an inlet for the very small amount of liquid is opened near the throat of a Venturi tube through which a small portion of the large amount of liquid flows. 4. The premixing section has a structure in which a bottomed tube is concentrically crowned from the opposite direction of the flange on a short tube with an open flange, and the very small amount of liquid flows from the flange side of the short tube to the cylindrical part through the nozzle. The liquid flows through the gap (3b) between the opposite end of the collar and the bottom of the bottomed tube, and the gap between the short tube and the bottom of the bottomed tube. (3c), gap between the collar and the opening of the bottomed tube (3
d), and the main mixing part is a contraction part formed by squeezing most of the large amount of liquid by the gap between the outer edge of the collar and the pipe (1). A liquid mixing device according to Clause 2 or 3. 5. The structure is such that the virtual resistance to the flow of most of the bulk liquid is caused by the spiral formed between the pipe ul and the premixing part (3) provided concentrically therewith. A liquid mixing device according to claim 2 or 3. 6. The liquid mixing device according to any one of claims 2, 3, and 4, wherein the premixing section is provided with a swelling and retention section for approaching complete back-mixing. 7. The liquid mixing device according to any one of claims 2, 3, and 4, wherein the premixing section has a built-in solid structure for achieving close to complete back mixing. 8. Claims 2 and 3, in which the pre-mixing section is provided with a stagnation-like bulge for producing an ink bottle effect.
The liquid mixing device according to any one of Item 4. 9. According to any one of claims 2 to 8, the peripheral length of the flow path at the portion where the liquid mixed in the premixing section flows into the main mixing section is increased and the corresponding diameter is decreased. liquid mixing equipment.