JPH0611361B2 - Operating method of pressurized freeze concentration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The apparatus used according to the method of the present invention can be used for various beverages and chemicals,
Alternatively, it is used to produce other concentrated solutions by freezing and pressurizing.

[Prior Art] An apparatus for obtaining a concentrated liquid by freezing a solution to form an ice crystal and then pressurizing the ice crystal to separate a solute having a high concentration in the ice crystal from the ice crystal has been developed.

A liquid generally has a freezing point (freezing point) when its concentration is high.
And the hardness of the produced ice crystals becomes large.

In order to freeze the solution (mother liquor) promptly to form ice crystals, the temperature of the cooling medium should be lowered further, but the produced ice crystals have a high hardness.

In a pressurization type freeze concentration device, ice crystals are forced to pass through the pressure cylinder by a tensile wire, so if the hardness of the ice crystals is large, the traction speed must be slowed, which is inefficient. Yes,
On the other hand, increasing the pulling speed causes an excessive load on the tensile wire and its driving device and causes a failure. However, the conventional device has not solved this point.

[Object of the Invention] The present invention provides a pressurization type freeze concentration apparatus in which the mother liquor is rapidly turned into ice crystals by a cooling medium having an extremely low temperature, and thus the ice crystals have a high hardness, Before entering, it is moderately softened so that it can pass through the pressure part without any hindrance.
The pulling speed of ice crystals can be reasonably increased, and the production capacity of concentrated liquid can be improved.

[Means of the Present Invention] In a method of operating a pressurizing freeze-concentrator according to the present invention, a pressure cylinder having a tapered taper hole is provided at a lower portion of a vertical cooling cylinder having a mother liquor container at an upper portion thereof. And a drain pipe for collecting the concentrated liquid is connected to the tapered hole, and an endless tensile wire for pulling ice crystals is sent through the mother liquor container, the cylinder, the heat insulating cylinder, and the pressurizing cylinder. Further, in the apparatus in which the cooling cylinder is composed of an upper cooling section and a lower cooling section each of which is supplied with a cooling medium for freezing the mother liquor, the lower cooling section is operated during steady operation. In addition, a cooling medium having a temperature slightly higher than that of the upper cooling unit is supplied so as to suit the pressurization condition of ice crystals.

[Examples] Examples of the present invention will be described with reference to specific examples shown in the accompanying drawings.

FIG. 1 is an overall view of an apparatus used in the present invention, in which a lower portion of a vertical cylinder 2 having a mother liquor container 1 at an upper portion is a cooling portion,
A pressurizing cylinder 3 having a tapered taper hole as a pressurizing portion is connected, and the cylinder 2 and the pressurizing cylinder 3 are connected to each other with a heat insulating cylinder 6 interposed between the flanges 4 and 5. .

Further, a tank 7 having a drain valve V at the bottom is provided at the bottom of the pressurizing cylinder 3, and a tensile wire 8 such as chain that is sent endlessly is supplied from the bottom hole of the mother liquor container 1 to the cylinder 2, The wheel 9 inside the tank 7 passes through the pressurizing cylinder 3.
It rises in reverse, is driven by the drive wheel 10, and is fed from the supply wheel 13 to the mother liquor container 1 and the cylinder 2 via the intermediate guide wheels 11 and 12 as described above. Is about 20 mm per minute.

The cylinder 2 has a jacket 1 which is the upper and lower cooling parts.
4, 15 are provided, 16a and 17a are inlets for each cooling medium and 16b and 17b are respective outlets.

A cooling medium at a negative temperature for freezing the mother liquor is supplied to the upper and lower jackets 14 and 15, but before the start, that is, before the tensile wire is driven, the lower jacket is -15 to-
A cooling medium of 30 ° C is supplied, the mother liquor or water flowing in the cylinder is quickly frozen, and the lower part of the cylinder is blocked with ice.

After this blockage by ice, mother liquor is supplied to the upper space in the cylinder and the tensile wire is also driven to start steady operation, but for steady operation, the cooling medium of -15 to -30 ° C is supplied to the upper jacket. On the other hand, the lower jacket is supplied with the cooling medium increased to -3 to -10 ° C.

Also, a jacket 18 is provided on the pressurizing cylinder 3 as a pressurizing body, and this jacket has a plus side of 2 to 5 ° C.
The cooling medium is supplied, and the reference numerals 19a and 19b indicate respective inlets and outlets for the fluid.

A drain pipe 20 for collecting the concentrated liquid is connected to the upper surface of the pressurizing cylinder 3, that is, the upper portion of the tapered hole.

In this apparatus, the solution in the cylinder 2 from the mother liquor container 1 is frozen by the cooling medium flowing in the jacket of the cylinder to become ice crystals 21, which are bonded to the tensile wire 8.

The tensile wire 8 is driven so as to descend in the cylinder 2,
This also lowers the ice crystals.

The ice crystals that have passed through the cylinder together with the tensile wire enter the next pressurizing cylinder 3, and are squeezed and pressed by the inner surface of the tapered hole of the pressurizing cylinder.

This pressurization lowers the freezing point of the ice crystals, and the ice crystals are melted from the part where the solute concentration is high. From the upper to the inlet side, drain pipe
It is collected from 20 in a collection container (not shown).

Further, the cylinder 2 is provided with an upper cooling part 14 and a lower cooling part 15 each of which is a jacket.

In the apparatus described above, the method of the present invention is
Supplying a cooling medium with an extremely low temperature of -15 to -30 ° C to the upper cooling part and a cooling medium of -3 to -10 ° C to the lower cooling part,
Make the temperature of the lower cooling section higher than that of the upper cooling section.

As a result, the mother liquor that has flowed into the cylinder is turned into ice crystals by the upper cooling unit 14 in a short time, and the ice crystals have high hardness due to the low temperature. Before being heated, since it is slightly heated in the lower cooling unit 15,
The hardness of the lower part of the ice crystal becomes small, and it can pass through the tapered hole of the pressurizing part without excessive resistance.

It is necessary to close the lower part of the cylinder before starting steady operation, which is done as follows.

In this initial blockage, a low cooling medium of -15 to -30 ° C is supplied to the lower cooling section, and the mother liquor is supplied little by little to the inside of the cylinder to freeze it, thereby causing ice to grow, and finally the lower part of the cylinder is cooled. Block with ice and do.

After this blockage, the above-mentioned steady operation is started.

[Effect] As described above, according to the present invention, the mother liquor supplied into the cylinder is rapidly turned into ice crystals by the upper cooling unit, and the ice crystals have a high hardness, When entering, since the lower cooling section moderately heats it and the hardness is low, it can be passed through the pressurizing section without applying excessive resistance.

Therefore, an overload is not applied to the ice crystal liquid pulling device in the pressurization type freeze concentration device, it is possible to prevent the pulling device from breaking down, the pulling speed of the ice crystals can be increased, and the concentrated liquid can be smoothly and smoothly It can be rapidly separated from ice crystals, and the concentrated liquid production capacity of the pressurization type freeze concentration device can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an apparatus used in the present invention, and FIG. 2 is a partially enlarged vertical sectional view. In the figure 1 …… Mother liquor container 2 …… Cooling cylinder 3 …… Pressurizing cylinder 4,5 …… Flange 6 …… Insulation cylinder 7 …… Tank 8 …… Tensile wire 9 ～ 13 …… Wheels 14 ～ 15 ...... Cooling jacket 18 …… Pressurizing cylinder jacket 20 …… Drain pipe for concentrated liquid recovery 21 …… Ice crystals

Claims (1)

[Claims] 1. A vertical cooling cylinder having a mother liquor container in the upper part thereof is connected to a lower part of a pressurizing cylinder having a tapered taper hole through an adiabatic cylindrical body, and a drain for collecting a concentrated liquid is provided in the tapered hole. A pipe is connected, and an endless tensile wire for pulling ice crystals is fed through the mother liquor container, the cylinder, the heat insulating cylinder, and the pressurizing cylinder, and the cooling cylinder is
An apparatus comprising an upper cooling section and a lower cooling section, each jacket being supplied with a cooling medium for freezing the mother liquor. A method of operating a pressurization-type freeze-concentrator, which comprises supplying a cooling medium having a temperature slightly higher than that of an upper cooling unit so as to be suitable.