JPH06210102A - Initial ice sealing method for compression freezing thickner - Google Patents

Abstract

PURPOSE:To effectively use mother liquor by unnecessitating a mechanical closing mechanism, such as a valve in the lower part of the inside of a cylinder for forming ice crystals before startup and using the residual ice crystal liquid as the initial ice sealing liquid. CONSTITUTION:To the lower part of a vertical cylinder 2 having the upper cooling part and the lower cooling part and having a mother liquid feeding upper port 1 is connected to a pressure cylinder 3 of a tapering hole. A dense liquid recovering drain pipe 20 is connected to the taper hole of the pressure cylinder. And a tensile wire 8 for pulling ice crystals is moved downwards inside the cylinder 2 and the pressure cylinder 3 and in the stationary operation of a tensile wire drive, a cooling medium of minus temperature a little higher than that for the upper cooling part is fed to the lower cooling part. Thus a pressure freezing thickner is constituted. And before startup where the tensile wire 8 is driven, the cooling medium of minus temperature lower than that for the upper cooling part is fed to the lower cooling part and a small quantity of ice sealing liquid is intermittently fed into the cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an initial ice-sealing method for a pressure-type freeze-concentrator, which can be obtained by freezing and pressurizing various beverages, chemicals, and other concentrated liquids.

[0002]

2. Description of the Related Art After freezing a solution to form ice crystals, the ice crystals are pressurized to separate a large part of the solute concentration in the ice crystals from the ice crystals.
Devices for obtaining concentrated liquids have already been developed.

The applicant company has developed a device that allows ice crystals to descend in a cooling cylinder, and closes the lower part of the cylinder with crushed ice before steady operation (movement operation of ice crystals by driving the ice crystal traction material). I made a device to do. However, this device requires an ice maker and an ice crusher, which increases the cost.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to make it possible to improve the concentrated liquid recovery processing capacity by allowing a tensile wire for pulling ice crystals to move downward. In the pressurization type freeze concentrator, before and after the ice crystals are lowered, the intermittently flowing liquid can be quickly frozen and blocked in the ice crystal forming cylinder. The obstruction mechanism is not necessary, and the residual ice crystal liquid is used as the initial ice-sealing liquid so that the mother liquor can be effectively used.

[0005]

The initial ice-sealing method for a pressurization type freeze concentration apparatus according to the present invention has a lower part of a vertical cylinder having an upper cooling part and a lower cooling part and having an upper port for supplying mother liquor. Connect a pressure cylinder with a tapered taper hole, connect a drain pipe for collecting concentrated liquid to the taper hole of the pressure cylinder, and a tensile wire for pulling ice crystals downward in the cylinder and pressure cylinder. In addition, during the steady operation of driving the tensile wire rod, the tensile wire rod is not used in the pressurizing freeze concentrator where the cooling medium of a minus temperature slightly higher than that of the upper cooling portion is supplied to the lower cooling portion. It is characterized in that a cooling medium having a minus temperature lower than that of the upper cooling unit is supplied to the lower cooling unit before the driven start, and a small amount of ice-sealing liquid is intermittently supplied into the cylinder.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a specific example shown in the accompanying drawings. FIG. 1 is an overall view of an apparatus used in the present invention, in which a pressurizing cylinder 3 having a tapered taper hole which is a pressurizing part is provided below a vertical cylinder 2 which is a cooling part having an upper port 1 for supplying a mother liquor in an upper part. Connected, cylinder 2 and pressure cylinder 3
Is connected by interposing a heat insulating material 6 between the flanges 4 and 5.

Further, an ice crystal liquid recovery tank 7 having a drain valve V at the bottom is provided below the pressurizing cylinder 3, and a tensile wire 8 such as a chain to be sent endlessly is provided with a mother liquid supply upper port. From the hole at the bottom of 1 into the tank 7 through the cylinder 2 and the pressurizing cylinder 3, the inside wheel 9 reverses and rises, and the drive wheel 10 drives the intermediate guide wheel 11,
It is sent from the supply wheel 13 via 12 to the mother liquor supply upper port 1 and the cylinder 2 as described above.

The cylinder 2 is provided with jackets 14 and 15 as upper and lower cooling parts, and 16a and 17a.
Reference symbol a denotes an inlet for each cooling medium, and 16b and 17b denote respective outlets. A jacket 18 is also provided on the pressurizing cylinder 3, which is a pressurizing body, and reference numerals 19a and 19b denote respective inlets and outlets for 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 device, the cylinder 2 from the upper port 1
The solution in the inside is frozen by the cooling medium flowing through the jacket of the cylinder to become ice crystals, and is bound to the tensile wire 8. The tensile wire 8 is driven so as to descend in the cylinder 2, whereby ice crystals are also descended.

The ice crystals that have passed through the cylinder together with the tensile wire enter the next pressurizing cylinder 3, where they 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. To the upper inlet side, and is collected from the drain pipe 20 into a collection container (not shown).

In the above-mentioned apparatus, it is necessary to close the lower part of the cylinder before forming ice crystals in the cylinder 2. After this closing, the solution is put into the cylinder to make it crystallize. According to the present invention, the blockage can be promptly performed without using an opening / closing mechanism such as a valve.

That is, before the formation of ice crystals in the cylinder, extremely low temperature of -20 to-in the lower jacket 15 of the cylinder.
A cooling medium of 30 ° C is supplied, and the upper jacket has 0-
Supply 5 ° C. cooling medium. Keep in this way Tank 7
The residual ice crystal liquid therein is supplied into the cylinder by the pump P from the upper port 1 little by little and intermittently.

By doing so, the solution flowing down along the inner wall of the cylinder is quickly frozen when passing through the lower jacket 15, and the solution flowing down subsequently is also frozen at intervals, and the lower part in the cylinder is It is closed by ice 21a. When the lower part of the cylinder was blocked with ice, the upper jacket 14 was supplied with a refrigerant of -10 to -30 ° C, the lower jacket 15 was supplied with a refrigerant of -5 to -10 ° C, and the mother liquor was introduced into the cylinder. The mother liquor is supplied from the tank 22 by the pump P. The supplied mother liquor is quickly frozen by the cooling medium in the upper jacket to become ice crystals 21b.

When the ice crystals 21b are formed, the tensile wire 8 is started by a signal from a timer or the like to start a steady operation, whereby the solute-rich portion is separated in the pressurizing cylinder and taken out as a concentrated liquid. .

During steady operation, the temperature of the cooling medium in the upper jacket and the lower jacket should be -10 to -3.
The temperature of 0 ° C. or -5 to -10 ° C. allows the mother liquor supplied into the cylinder to quickly crystallize in the upper cooling part, but the ice crystals are too hard, so the lower cooling part is slightly heated. So that it can be moved and passed through the pressurizing cylinder with a relatively small resistance, thus improving the production capacity.
This is to prevent the traction device from being overloaded.

[0016]

As described above, according to the present invention, the ice crystals formed in the cylinder are forcibly lowered and the solute in the ice crystals is separated by the pressure applied when passing through the pressurizing cylinder. In the pressurization type freeze concentrator according to the present invention, the lower part of the cylinder can be closed with ice before starting the steady operation. Therefore, it is not necessary to provide a mechanical opening / closing mechanism for closing the lower part of the cylinder before starting.
It is possible to provide a pressure-type freeze-concentrator with low equipment cost.

Further, since the residual ice crystal liquid in the tank 7 is used to close the inside of the cylinder in the initial stage, the mother liquor is not wasted and the mother liquor can be effectively used. is there.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an apparatus used in the present invention.

FIG. 2 is a partially enlarged vertical sectional view of an apparatus used in the present invention.

[Explanation of symbols]

 1 ・ ・ Upper port 2 ・ ・ Cooling cylinder 3 ・ ・ Pressurizing cylinder 4,5 ・ ・ Flange 6 ・ ・ Insulation material 7 ・ ・ Tank 8 ・ ・ Tensile wire rod 9, 10, 11, 12, 13 ・ ・ Wheel 14, 15 ················································································································································································································ —> — >> — >>>

Claims (1)

[Claims] 1. A pressurizing cylinder having a downward tapered taper hole is connected to the lower part of a vertical cylinder having an upper cooling part and a lower cooling part and having an upper opening for supplying mother liquor, and the taper hole of the pressurizing cylinder is A drain pipe for concentrated liquid recovery is connected, and a tensile wire for pulling ice crystals is moved downward in the cylinder and the pressurizing cylinder. In a pressurization type freeze concentrator in which a cooling medium having a temperature slightly lower than that of the upper cooling unit is supplied, the lower cooling unit has a lower negative temperature than that of the upper cooling unit before starting when the tensile wire is driven. The initial ice-sealing method of the pressurization type freeze-concentrator, in which the cooling medium is supplied and a small amount of the liquid for ice-sealing is intermittently supplied into the cylinder.