JP3023226B2 - Stirrer stirring method measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the stirring performance of a stirrer.

[0002]

2. Description of the Related Art Conventionally, in order to measure the stirring performance of a stirrer, particularly the stirring performance of a stirring blade, an electrode of a PH meter or a conductivity meter is inserted into a liquid mixture being stirred in a stirring vessel.
Continuously measure the pH and conductivity of the mixture, which has a certain relationship with the degree of mixing of the liquid mixture, and measure the time required to reach a predetermined measurement value, or measure a small amount of the mixture under stirring at predetermined intervals. To measure the physical properties of the mixture related to the degree of mixing, for example, changes in the concentration of the mixture.

However, in this conventional method,
In the case of a high-viscosity liquid substance, when using a PH meter or conductivity meter, the measurement location is partially biased, only local data is obtained, and the measurement element (electrode) is There is a drawback that correct measurement value cannot be obtained because it acts as a baffle and causes poor fluid flow.
Also, when sampling a small amount of the liquid mixture during stirring, it takes time until a measurement value is obtained, it is difficult to grasp the degree of mixing of the mixture during stirring at any time,
There was a drawback that accurate stirring performance of the stirrer could not be measured.

Therefore, in order to eliminate these drawbacks,
After mixing the colorant into the mixed liquid substance put in the stirring container and stirring, and after uniformly coloring, mix and stir with the decolorizing agent that can completely decolorize the color, and visually check the degree of decolorization 2. Description of the Related Art It has been practiced to check the degree of mixing of substances and measure the time until a predetermined degree of mixing is reached.

[0005]

In this conventional method for measuring the stirring performance of a stirrer, the degree of decolorization corresponding to a predetermined degree of mixing is relied on visual observation, and the criteria of individual measurers do not always match. So it was difficult to get reliable measurements.

The present invention has been made to solve the above-mentioned drawbacks in the conventional method for measuring the stirring performance of a stirrer. The mixing degree of a liquid substance to a specific decolorizing agent is successively measured in a non-contact manner, and the predetermined degree is measured. It is an object of the present invention to provide an accurate and reliable method for measuring the stirring performance of a stirrer, which measures the time until the degree of mixing becomes equal.

[0007]

In order to solve the above-mentioned problems, a method for measuring the stirring performance of a stirrer according to the present invention is to provide a transparent or translucent stirring vessel with a liquid substance having a predetermined viscosity and a coloring agent for the liquid substance. After the color has become uniform, add an amount of decolorizing agent that can completely decolor the coloring by the colorant, and set the transmitted light amount of the colored liquid substance outside the stirring container with stirring. The illuminometer continuously measures the time, and measures the time until it reaches a predetermined measurement value. Also, this measuring method is characterized in that the viscosity of the liquid substance can be applied consistently from low viscosity to high viscosity.

[0008]

[Function] Since the degree of bleaching is continuously measured by an illuminometer, the measured value is more accurate than the visual observation, and the time required to reach a predetermined measured value is measured, so that correct and reliable stirring can be achieved. Performance can be measured. Therefore, if the stirring performance is measured for each stirring blade, it is not only necessary to perform a stirring test of the stirring blade in the laboratory before actual use, but also to use the measured value when designing the stirring blade. Can be.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus shown in FIG. 1 is a stirring performance measuring machine of a stirrer using an illuminometer for carrying out the method of the present invention.

In the figure, 1 is a liquid substance 2 having a predetermined viscosity.
Is a cylindrical stirring vessel made of transparent glass having an inner diameter of 185 mm and having a bottom mirror-like shape. In the stirring vessel 1, a stirrer 3 having a stirring blade 4 is provided. Reference numeral 5 denotes a transparent acrylic resin water tank containing cooling water 6 for cooling the stirring vessel 1 to maintain the temperature at a constant temperature, and a supply pipe 7 and a drain pipe 8 are connected.

Illumination devices 9 and 10 are equipped with 300 W light bulbs. In particular, the illumination device 9 is directed at right angles to the surface of the liquid substance in the stirring vessel 1. Reference numeral 11 denotes a 4-magnification Fresnel lens for collimating light rays. The transmitted light amount is measured 60 mm below the Fresnel lens 11 by an illuminometer 12 having a sensitivity of 0 to 1000 lux. The measured value is a recorder 13 having a timer. Recorded in. In addition, 1 in FIG.
4 is a baffle.

The liquid substance 2 is a glycerin solution of 500 cp and contains 5 liters (liquid depth 190 mm). The glycerin solution is stirred at a predetermined stirring speed. 50 ml of a 0.2 mol / liter KI aqueous solution is mixed into the stirring liquid from the liquid surface, and the liquid substance 2 is colored by stirring. After the coloration becomes uniform by stirring, 50 cc of a 0.1 mol / L aqueous sodium thiosulfate solution is added to the stirred solution to cause a decolorization reaction.

At this time, the change in the density of coloring and decoloring is replaced with the change in illuminance, and the decoloring is completely completed (the illuminance becomes almost constant).
Record until you do. That is, the maximum change amount between the coloring recording line and the complete decoloration recording line is read on a scale or scale, and a certain numerical value (C%) between 90 to 99% of the maximum change amount is determined to decolorize. Matching point B where the recording line matches
Is determined, and the lapse of time (T _{0 to} T ₁ ) from the decolorizing agent feeding point A to the matching point B is defined as an apparent mixing time (see FIG. 4).

Example 1 Three swept wings with a rotating diameter of 92 mm and 2
When a single finger-shaped baffle is installed and a 500 cp viscosity glycerin aqueous solution is stirred at a stirring speed of 550 rpm. Maximum change amount of illuminance recording, coloring recording line and decoloring recording line =
73.5 mm Apparent change = 0.99 x 73.5 mm = 72.765
mm Chart speed = 60 mm / min = 1 mm / sec Apparent mixing time = 180 mm / 1 mm / sec = 180
sec

Example 2 Six flat turbine blades having a rotating diameter of 92 mm (see FIG. 3) and two flat baffles having a width of 18 mm were installed, and a 500 cp aqueous glycerin aqueous solution was stirred at 500 rpm.
In the case of stirring at rpm, the maximum change amount of the illuminance recording, the coloring recording line and the decoloring recording line =
35.5 mm Apparent change = 0.99 × 35.5 mm = 35.1 mm Chart speed = 60 mm / 1 min = 1 mm / se
c Apparent mixing time = 144 mm / 1 mm / sec = 144
sec From the results of Example 1 and Example 2, it was possible to numerically demonstrate that six flat turbine blades have better stirring performance than three retreating blades.

[0016]

According to the present invention, the transmitted light amount of the colored liquid substance is continuously measured in a non-contact manner by an illuminometer installed outside the stirring vessel, and the time until the measured value is reached is measured. Therefore, it is possible to obtain an accurate and reliable numerical value representing the stirring performance of the stirrer.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a stirrer for performing a method of the present invention.

FIG. 2 is an enlarged front view of a main part when a baffle is installed in the stirrer of FIG.

FIG. 3 is a front view of a main part of a six-blade flat turbine that can be installed in the stirrer of FIG. 1;

FIG. 4 is a diagram showing a relationship between a transmitted light amount and a stirring time in a stirrer.

[Description of Signs] 1 Stirring vessel 2 Liquid substance 3 Stirrer 4 Stirring blade 5 Water tank 6 Cooling water 7 Supply pipe 8 Drainage pipe 9, 10 Illumination device 11 Fresnel lens 12 Illuminometer 13 Recorder 14 Baffle A Decolorizing agent injection point B Coincidence point T ₀ Start of decolorizing agent injection T ₁ Apparent mixing time

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01F 1/00-15/06

Claims (1)

(57) [Claims] 1. A transparent or translucent stirring vessel is charged with a liquid substance having a predetermined viscosity and a coloring agent of the liquid substance, and stirred.
After the coloring becomes uniform, an amount of the decolorizing agent capable of completely decoloring the coloring by the coloring agent is supplied, and the amount of transmitted light of the colored liquid substance is continuously measured with an illuminometer installed outside the stirring vessel while stirring. And measuring the time required to reach a predetermined measured value.