JPH0644964B2 - Pressurized freeze concentrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an apparatus for obtaining various beverages, chemicals, and other concentrated liquids by freezing and pressurizing.

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

As one of such devices, in order to improve the recovery capacity of the concentrated liquid, the ice crystals of the concentrated mother liquor combined with the tensile wire in the vertical cylinder that is the freezing mechanism are pulled downward,
There is a device that efficiently obtains a concentrated liquid by pressurizing the inside of a taper hole that is tapered.

However, when the pulling direction of the tensile wire is downward as described above, in order to obtain the ice crystals of the concentrated mother liquor bound to the tensile wire, the mother liquor supplied to the cylinder is frozen until it is frozen. A blocking mechanism is required to prevent the flow of water, and the device itself is complicated and the cost is high.

Therefore, there is also a device that fills a liquid with a high freezing point (for example, water) from the tank in which the tapered hole is opened to the lower part of the cooling cylinder in advance, freezes the liquid in the tapered hole and the lower part of the cylinder, and thereby closes the cylinder bottom part. Since the time for closing the bottom of the cylinder is wasted, the recovery capacity of the concentrated liquid decreases.

Also, after the bottom of the cylinder is blocked, the mother liquor for concentration is supplied into the cylinder, and this mother liquor is frozen in the cylinder to form ice crystals bound to the tensile wire. There is also a point that it cannot be said that a concentrated liquid recovery operation is wasted because it is wasted.

Furthermore, since the amount of heat exchange required to freeze the mother liquor having a low freezing point in the cylinder is large, it is necessary to increase the cooling capacity of the cooling cylinder, which is the freezing mechanism, and the apparatus itself cannot be made compact.

[Objective] The present invention shortens the time required to form ice crystals bonded to the tensile wire and enables efficient recovery operation of the concentrated liquid, and the device itself is made compact to freeze the cooling mechanism of the cooling cylinder. It was made possible to provide a pressurization type freezing and concentrating apparatus capable of sufficiently obtaining ice crystals of the mother liquor for concentration even if the cooling capacity of the above is reduced.

[Procedure] In order to achieve the above object, a pressurizing-type freeze-concentrating apparatus according to the present invention has a vertical cooling cylinder having a freezing cooling section, and a pressurizing cylinder having a tapered hole at an upper portion thereof. The endless tensile wire is connected through a heat insulating material so that it can be fed through a hole formed in the bottom of the mother liquor container through the cylinder and the pressurizing cylinder, and is added from the slurry liquid manufacturing machine. It is configured to supply the slurry-like liquid into the pressure cylinder and the cooling cylinder.

[Operation] Since the slurry-like liquid supplied into the pressurizing cylinder and the cooling cylinder contains a large amount of fine ice particles, it does not leak from the tapered hole that opens at the bottom of the pressurizing cylinder. The slurry liquid easily freezes due to the transfer of a very small amount of heat and closes the bottom of the cooling cylinder.

Further, when the mother liquor for concentration having a low freezing point which is slurried by the slurry liquid maker is supplied into the cooling cylinder with the bottom closed, the mother liquor is frozen due to a slight amount of heat transfer. The ice crystals bound to the tensile wire can be formed in a short time, or the mother liquor for concentration having a low freezing point can be easily frozen by a cooling cylinder having a small cooling capacity.

[Embodiment] 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 a device according to the present invention, in which a vertical cooling cylinder 2 having a container 1 at an upper portion thereof is a vertical cooling cylinder 2 and a pressurizing cylinder 3 having a tapered inner surface as a pressurizing portion is provided at a lower portion thereof. The cooling cylinder 2 and the pressurizing cylinder 3, which are connected to each other, are connected to each other with a heat insulating material 6 interposed between the flanges 4 and 5.

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 a chain to be sent endlessly is fed from the hole at the bottom of the container 1 to the cooling cylinder 2. The container 1 passes through the pressurizing cylinder 3, enters the recovery tank 7, reverses and rises by the inner wheel 9, is driven by the drive wheel 10, and passes from the intermediate guide wheels 11, 12 to the supply wheel 13 and the container 1 as described above. , And is sent to the cooling cylinder 2.

As shown in FIG. 2, the cooling cylinder 2 is provided with jackets 14 and 15 as upper and lower cooling portions, and 16a and
17a indicates the inlet for each cooling medium, and 16b and 17b indicate the same outlets.

A jacket 18 is also provided on the pressurizing cylinder 3, which is a pressurizing member, and reference numerals 19a and 19b denote respective inlets and outlets for fluid.

The inside of the tapered hole and the liquid recovery container 21 are connected by a drain pipe 20 which is opened at an appropriate position on the upper surface of the pressurizing cylinder 3, that is, at the inlet of the tapered hole.

Further, the slurry-like liquid produced by the slurry-like liquid producing machine 22 is supplied to the container 1 from the slurry-like liquid supply pipe 23 by the pump P.

This slurry liquid manufacturing machine 22 is provided with a jacket 25 of a cooling cylinder, which is a cooling cylinder, on the outer circumference of a cooling cylinder 22a to which liquid is supplied from a liquid supply pipe 24, and both ends of the cooling cylinder 22a are in contact with the inner surface of the cooling cylinder. The scraping plate 22b that slides and rotates in this state is provided.

The scraping plate 22b is connected to the rotating shaft 26 of the motor, is rotated by the motor M as appropriate, and is provided with inlets and outlets 25a, 25a for cooling refrigerant provided in the jacket 25 of the cooling cylinder.
Since the cooling refrigerant for cooling the peripheral surface of the cooling cylinder 22 is supplied from b, the liquid supplied into the cooling cylinder is cooled on the inner peripheral surface of the cooling cylinder and freezes, and this cooling By scraping off the thin ice adhering to the inner surface of the cylinder with the scraping plate 22b, a slurry-like liquid containing a large amount of fine ice particles of, for example, 0.5 to 1.5 mm is produced.

In the apparatus configured as described above, for example, water having a relatively high freezing point is supplied to the slurry liquid producing machine 22 to form slurry water, and this slurry water is supplied to the container 1 communicating with the cooling cylinder 2.

The slurry-like water flows down the cooling cylinder 2 and reaches the pressurizing cylinder 3, but since the slurry-like water contains a large amount of fine ice, it does not flow down from the taper hole and forms a lump to block the bottom of the cooling cylinder. When frozen, it freezes to form the blocking ice 26.

Next, the mother liquor for concentration is supplied to the slurry liquid producing machine 22 to make a slurry mother liquor, and this slurry mother liquor is supplied from the container 1 into the cooling cylinder 2 to cause freezing, and the tensile wire 8
Ice crystals 27 combined with.

Since the slurry mother liquor contains a large amount of fine ice inside, the amount of heat taken for completely freezing becomes small and the slurry mother liquor is easily frozen by a slight amount of heat transfer.

When the slurry mother liquor is completely frozen and ice crystals 27 are formed, the tensile wire 8 is driven to descend in the cylinder 2, and thereby the ice crystals 27 are also lowered.

The ice crystals 27 that have passed through the cylinder together with the tensile wire 8 are squeezed and pressed by the inner surface of the tapered hole of the pressure cylinder when entering the next pressure cylinder 3.

This pressurization lowers the freezing point of the ice crystals 27, the solute-rich portion in the ice crystals melts from the high concentration portion, and the melted concentrated liquid melts from the high pressure portion applied to the ice crystals to the low pressure portion,
That is, it moves from the lower side of the tapered hole to the upper inlet side, and is recovered from the drain pipe 21 into the recovery container 22.

The blocking ice 26 is removed by an appropriate means such as flowing the fluid having a temperature higher than the freezing point to the jacket 18 of the pressurizing cylinder to melt it and discharging it to the tank 7, and the drain pipe 20 to the liquid recovery container 21 is removed. Try not to reach it.

[Effect] As described above, according to the pressurization type freeze concentration apparatus of the present invention, since the supply liquid is slurried by the slurry liquid production machine and supplied to the apparatus main body, the supplied liquid is frozen. The amount of heat exchange required in the device can be reduced.

Therefore, if the cooling cylinder has the same cooling capacity as the conventional device, the liquid supplied into the cylinder can be frozen in an extremely short time, and the cooling capacity is smaller than that of the conventional device. However, it can be frozen in about the same time as the conventional device.

That is, the cooling capacity of the cooling cylinder is the temperature and supply amount of the cooling refrigerant supplied into the jacket, the thermal conductivity of the cylinder forming material, the capacity of the cylinder with respect to the surface area of the cylinder capable of heat exchange (heat exchange per unit capacity). Amount) etc., for example, make the jacket part to which the cooling refrigerant is supplied smaller to make the device compact, or increase the diameter of the cooling cylinder so that the cylinder capacity is larger than the internal surface area of the cylinder. It is also possible to increase the throughput.

Furthermore, the mother liquor for concentration exchanges heat with the inner surface of the cooling cylinder while flowing down in the cylinder, and almost reaches the freezing point, but a shorter distance than the conventional device is sufficient to remove the heat required for freezing of the slurry mother liquor from the inner surface of the cylinder. Therefore, the device can be made compact by shortening the length of the cylinder.

Also, if the cooling capacity of the cooling cylinder is made equal to that of the conventional one, the amount of ice crystals formed in the cylinder per unit time increases, so ice crystals are sequentially formed above the ice crystals for continuous operation. In the case of carrying out, it becomes possible to increase the pulling speed of the tensile wire, and the throughput per unit time increases.

In the above-mentioned embodiment, the bottom of the cooling cylinder is closed with ice having a relatively high freezing point, but the present invention is not limited to this, and the slurry-like liquid for producing the cylinder-bottomed slurry-like liquid is used. In some cases, a slurry mother liquor manufacturing machine for manufacturing a slurry mother liquor may be provided separately from the liquid manufacturing machine.

[Brief description of drawings]

FIG. 1 is a front view showing an example of an apparatus according to the present invention, FIG. 2 is a partially enlarged vertical sectional view, and FIG. 3 is an enlarged sectional view taken along line III-III of FIG. In the figure 1 ... Mother liquor container, 2 ... Cooling cylinder 3 ... Pressurizing cylinder 4, 5 ... Flange 6 ... Insulating material, 7 ... Tank 8 ... Tensile wire, 9-13 ... Wheel 14, 15 …… Cooling jacket 18 …… Pressurizing cylinder jacket 20 …… Drain pipe, 21 …… Recovery container 22 …… Slurry liquid manufacturing machine 22a …… Cooling cylinder 22b …… Scraping plate 22c… … Motor rotation shaft 23 …… Slurry liquid supply pipe 24 …… Liquid supply pipe 25 …… Cooling cylinder jacket 26 …… Blocking ice, 27 …… Ice crystals P …… Pump, M …… Motor

Claims (1)

[Claims] 1. A vertical cooling cylinder having a freezing cooling section is connected to an upper part of a pressurizing cylinder having a tapered taper hole through a heat insulating material, and an endless tensile wire is attached to the mother liquor. A freeze-concentrating device that is recirculated through a hole formed in the bottom of the container through the cylinder and the pressurizing cylinder, and a slurry liquid production machine that supplies the slurry liquid into the pressurizing cylinder and the cooling cylinder. A pressurization type freeze concentration device characterized by the above.