JPH10192603A - Concentrated solution separation device for ice/water in dynamic ice making process and conveyor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with fresh water cleaning and make an entire freezing/ concentrating system compact by separating sea water into ice, fresh water and brine with a centrifugal force caused by gyration in a freezing/concentrating device through a dynamic ice making process of an aqueous solution. SOLUTION: Sea water which is supercooled into a supercooling state flows into a separator 8 from a separator inlet 1 provided at the lower part of the separator 8. Then the sea water runs into a baffle 3 to become ice slurry through the discontinuation of a supercooling process. The ice slurry is forced to the upper part of the separator 8 by a discharge pressure from a pump, but at the same time, is given a turn by a stirrer 2. In this stirrer 2, an ice 5 and a fresh water which are of low density are collected in the center, while a brine which is of a high density is collected on the outer part. In addition, the ice 5 is prevented from being backward flowed to the outer part with the held of a mesh cylinder 4 arranged in the separator 8. The brine collected on the outer part is drained to the outside from a separator outlet 7 provided above the lateral face of the separator 8. Further, the ice 5 and the fresh water collected in the center are drained from an outlet 6 on the top of the separator 8 mounted on the top lid of the separator 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a system for separating various kinds of solutions such as seawater using freeze concentration.

[0002]

2. Description of the Related Art A conventional method for separating ice / seawater (brine) using seawater as an example will be described below. One example of a conventional technique for extracting ice in an ice slurry generated from seawater is a washing tower method. The washing tower is shown in FIG. The ice slurry flows from the subcooling release tank 19 in the figure by the slurry pump 18 from the washing tower lower inlet 9 (ice slurry) at the lower part of the washing tower 17 and rises inside the washing tower 17. During the ascent, only the brine in the ice slurry passes through the mesh 10 located on the side and is discharged from the washing tower outlet 12. Further, from the upper part, the washing water 14 is supplied to the washing tower 14 through the washing tower upper entrance 11 and the washing water jetting pipe 13.
5 is poured. The washing water 14 is a part of fresh water obtained from the ice 15 separated and washed by the main washing tower 17. The ice 15 further floats in the wash water, and during the float, the salt attached to the ice surface is removed by the wash water. The ice 15 that has floated up to the upper portion of the washing tower 17 is pushed out by the lower ice that continuously floats and overflows the melting tank 16. In the melting tank 16, the ice 15 is melted, and fresh water having a low solute concentration is obtained. Including the washing tower method described above, ice separation and ice separation from seawater, which has been considered so far,
In most of the washing methods, brine is removed by using gravity, and a part of the obtained fresh water is used to remove salt on the surface.

In general, as described above, fresh water is obtained from seawater and this fresh water is used for various purposes.
Ice slurry obtained by separating seawater by freeze concentration,
Since a system that does not effectively use the heat as it is as a cooling source has not been adopted, an example of an ice slurry transport system recently used in a district cooling plant is shown here as a conventional example.

A conventional ice slurry transport system is shown in FIG. The supercooled water 31 in the supercooled state by the supercooler 26 is released from the supercooled state (ice is precipitated) by the collision plate 28 arranged in the heat storage tank 27 to become an ice slurry.
Accumulate in A low concentration (for example, about 5%) ice slurry 32 flows out of the heat storage tank 27, and is supplied with an IPF (Ice Packing Factor).
: Ice filling rate) The controller 29 enters the controller 29 and is adjusted to a moderately high concentration ice slurry 33 (for example, about 15%). At this time, the separated cold water 34 is returned to the heat storage tank 27. The high-concentration ice slurry 33 is used by the heat consumer 30 as a cold heat source. The used ice slurry becomes cold water 35 and becomes a heat storage tank 2.
7, and then flows from here to the supercooler 26 to become the supercooled water 31.

[0005]

As described above, when the brine is separated from the ice slurry by gravity, the salt attached to the ice surface cannot be completely removed, and the obtained water has salt remaining. Therefore, as in the case of the washing tower method, fresh water obtained to wash out the salt is used. However, the amount of generated fresh water is reduced, which is uneconomical. The present invention has been made in view of such a point, and is basically an economical method for separating ice / seawater without using fresh water obtained from the present system.

In the conventional ice slurry transport system,
A large heat storage tank is provided assuming ice making and heat storage by nighttime electric power, and an IPF regulator for adjusting the ice slurry to an appropriate concentration is separately provided. However, only when nighttime power is used, a large space is required for the above-described device. The present invention has been made in order to solve such a problem, and combines the functions of a separation device and an IPF regulator for separating concentrated seawater and ice slurry into one unit, and at the same time reduces the size of the application example. As one,
It is an object of the present invention to provide a district cooling and heat supply system using seawater.

[0007]

SUMMARY OF THE INVENTION The present invention provides an apparatus and a system for separating various solutions such as seawater using freeze concentration. In the present separation apparatus, for example, in the case of seawater, forcible separation is performed by centrifugal force using the density difference between ice or freshwater and seawater. Specifically, a swirling flow is applied to an ice slurry obtained from seawater, and ice and freshwater are collected at the center, and brine is collected around the ice slurry, and only the brine is eliminated to obtain ice and freshwater. Furthermore, in this method, an impingement plate is arranged in a separator, which is a component of the separation device,
The supercooled water is released from the supercooled water in the separator to generate the ice slurry, thereby saving the space required for the conventional supercooled release tank. In addition, an IPF regulator is integrally connected above the separator to eliminate only the brine in the separator and to remove the ice slurry that has swirled upward by its centrifugal force. , So that ice is forcibly separated in the center and fresh water is forcibly separated in the periphery to adjust IPF.
The above separating device and the IPF regulator were integrally combined and incorporated into an ice slurry transport system.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, swirling is imparted to an ice slurry by flowing the ice slurry into a separator using a stirrer or a tangential. As a result, ice and fresh water are collected at the center, and brine is collected at the periphery due to the difference in density. In addition, it can be expected that the salt flowing on the ice surface is washed away by the countercurrent flow of the ice flowing to the center and the brine and freshwater flowing to the outside. Further, by disposing a mesh tube between the ice and the freshwater layer and the brine layer, the ice is prevented from flowing out. Further, a collision plate is provided in the apparatus, and supercooled water is caused to collide with the collision plate, thereby disturbing the supercooled water and releasing the supercooled water. In the IPF regulator integrated with the separator, the discharge amount of fresh water forcibly separated around the container by centrifugal force is adjusted to an appropriate ratio as in the case of the conventional IPF regulator. An ice slurry adjusted to a suitable ice slurry concentration can be supplied to heat consumers.

The separation apparatus of the present invention can separate an aqueous solution such as seawater into ice / water and a concentrated solution (in the case of seawater, seawater). The aqueous solution that is the object of the present invention is not limited to seawater, and can be applied to an aqueous solution containing other solutes. Specifically, there is a case of waste liquid (water) treatment and reuse.

In the present invention, the supercooled water is released from the supercooled water in the separator to generate the ice slurry, so that the space required for the conventional supercooled release tank can be saved. As the supercool release means, for example, an impingement plate provided in a separation device can be mentioned, and by colliding the supercooled water with the impingement plate, the supercool water can be disturbed to release the supercool. . Other means for canceling the supercooling include a means using an electronic cooling unit constituted by an electronic cooling element using a known combination of semiconductors (using the Peltier effect), and a means utilizing ice nucleation active bacteria (Japanese Patent Publication No. 6-12184). ).

The separation device of the present invention separates seawater and the like into ice / water and a concentrated solution (seawater) by centrifugation utilizing the difference in density. Centrifugation is achieved by imparting swirling to the ice slurry. Means for imparting swirling to the ice slurry include stirring with an agitator and tangentially flowing the ice slurry into the separator.

In the ice slurry carrying system of the present invention, an IPF regulator is integrally connected above the separating device, and only the brine is eliminated in the separating device, and the ice slurry that has swirled upward is removed.
The centrifugal force forcibly separates ice at the center and fresh water around the center, and supplies and conveys an ice slurry whose IPF has been adjusted to a desired concentration as a cold heat source. The desired concentration is a so-called design concentration determined from the lower limit value of the IPF that can be blocked during transport or the required amount of cold heat in the heat consumer.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings, but the present invention is not limited to this. FIG. 1 is an example of the structure of an ice / freshwater / seawater separation device according to the present invention. In addition, this figure is an example in which a swirl is given to the ice slurry using a stirrer. In the following description, seawater is taken as an example, but the same applies to other solutes.

The seawater which has been supercooled by the supercooling is
It flows into the separator 8 from the separator inlet 1 provided at the lower part of the separator 8. Then, first, it collides with the collision plate 3, and the supercooling is released to form an ice slurry. The ice slurry is pushed to the upper part of the separator by the discharge pressure of the pump, but is simultaneously swirled by the stirrer 2. Here, low density ice and fresh water are collected in the center, and high density brine is collected outside. In addition, the ice cylinder 5 is provided by the mesh cylinder 4 arranged in the separator 8.
Should not be returned to the outside. Since the ice diameter is about 0.5 to 1 mm, the mesh roughness of the mesh is preferably equal to or less than the dimension. The brine collected outside is removed to the outside of the separator by the separator outlet 7 provided above the side of the separator 8. The ice and fresh water collected at the center are discharged from the separator upper outlet 6 provided on the top cover of the separator 8.

FIG. 3 shows an application example of the apparatus to an ice slurry transport system. The seawater is sent to the supercooler 26 via the filter 20, and the supercooled water 23 in the supercooled state is
First, it is sent into the separator 8 and collides with the collision plate 3 to release the supercooling, so that an ice slurry is obtained. Therefore, as described above, due to the swirling force of the stirrer 2, the brine with a high density is collected outside the mesh tube 4 and discharged out of the system from a separator outlet provided above the side of the separator 8. Separator 8
The low-density ice and fresh water gathered in the center of the IPF adjust the upper IPF regulator 2 while rotating as it is as an ice slurry.
1 flows into. Again, under the action of the centrifugal force, fresh water is collected outward in the IPF regulator 21 and ice is collected in the center. Generally, in this state, since the IPF concentration is low, it is necessary to adjust the concentration to an appropriate concentration according to the heat demand. The flow rate of the chilled water discharged from the chilled water outlet, which is opened on the side wall of the IPF adjuster 21, is adjusted to a predetermined value. Is adjusted to the IPF concentration.
The discharged cold water is returned to the supercooler 26 again.
Here, the obtained and adjusted ice slurry 24 is supplied to the heat consumer 3
It is sent to 0 and used as a cold heat source. The used ice sly rises in temperature, becomes cold water, returns to the supercooler 26, and performs a cycle of becoming supercooled water again. It should be noted that since the internal fluid is swirled, the brine outlet in the separator 8 and the cold water outlet piping of the IPF regulator are desirably provided in a tangential direction so as to be easily discharged. The boundary between the separator 8 and the IPF controller 21 is provided with a partition wall outside the mesh tube 4 to prevent the brine separated by the separator 8 from flowing into the IPF controller 21, The inside of 4 is open so that both vessels communicate with each other.

[0016]

By separating ice / fresh water and brine by centrifugal force generated by swirling, washing with fresh water, which was conventionally required, becomes unnecessary, and the amount of fresh water obtained from the present system increases. In addition, by performing supercooling release and separation in the present separator, the system can be made compact. By using the ice slurry generated in the separation process of seawater desalination by the freeze concentration method, the above-mentioned separation device is applied to an ice slurry transport system as a cold heat source, and is integrated with an IPF regulator to simplify the system. At the same time, we can utilize inexhaustible resources called seawater. In the conventional system, the piping system is complicated, but in the present system, the simplification of the system can reduce the piping material cost and the laying cost. INDUSTRIAL APPLICABILITY The present invention is not limited to seawater, and can be used as a separation device and a transport system for various solutions.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a separation device of the present invention.

FIG. 2 is a configuration diagram showing a conventional separation device.

FIG. 3 is a system diagram showing an example of the ice slurry transport system of the present invention.

FIG. 4 is a system diagram of a conventional ice slurry transport system.

[Explanation of symbols]

 Reference Signs List 1 separator inlet (ice slurry) 2 stirrer 3 collision plate 4 mesh cylinder 5 ice 6 separator upper outlet (ice / fresh water) 7 separator outlet (brine) 8 separator 9 washing tower inlet (ice slurry) 10 mesh 11 washing Tower inlet (wash water) 12 Wash tower outlet (brine) 13 Wash water jet pipe 14 Wash water 15 Ice 16 Melting tank 17 Wash tower 18 Slurry pump 19 Subcooling release tank 20 Filter 21 IPF regulator 22 Partition wall 23 Supercooled water 24 Ice slurry 25 Cold water 26 Supercooler 27 Heat storage tank 28 Collision plate 29 IPF regulator 30 Heat consumer 31 Supercooled water 32 Low-concentration ice slurry 33 High-concentration ice slurry 34, 35, 36 Cold water

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yuichi Otani 2-1-1, Shinhama, Arai-cho, Takasago-shi, Hyogo Inside the Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory

Claims (2)

[Claims] 1. An apparatus for freezing and concentrating an aqueous solution by dynamic ice making, wherein the supercooled solution is released from a supercooled solution by centrifugal separation into a concentrated solution and an ice / ice slurry via a mesh tube. Means for separating ice / water and concentrated solution in dynamic ice making. 2. In an ice slurry transport system for supplying cold heat, an aqueous solution is supplied to a subcooler to make it into a supercooled state, and is introduced into the separation device according to claim 1 to separate and extract only freshwater ice slurry. An ice slurry transport system, wherein an ice slurry having a desired concentration adjusted by an ice filling rate controller integrated with the separating device is supplied and transported.