JPH11142031A - Ice block production preventive ice storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute the group of concentrated ice particles on the periphery of a load take-out port by using a water soluble refrigerating liquid and disposing a filter for preventing ice particles from floating at a specified position under the liquid level thereby preventing production of ice blocks in an ice storage tank. SOLUTION: An inner manhole 16 at the upper part of an ice storage tank 10 is provided with a filter 18 for preventing ice particles 20 from floating made of a punching metal, for example. A supply line introduces brine 22a stored on the bottom of the ice storage tank to brine filling chamber formed above the filter 18. It is set at a position lower by a specified water level from the liquid level 21 in a filling chamber formed in a manhole 17. The brine 22a is a water soluble non-freezing aqueous solution. The ice storage tank 10 has an inclining top plate structure or a curvature dome and introduces ice particles 20 or bubbles 20a into the inner manhole 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage tank for storing an ice water mixture in the form of a slurry and carrying it out to a load by a transfer pump, and more particularly to an ice heat storage tank for preventing the formation of ice blocks during transfer.

[0002]

2. Description of the Related Art High-density cold storage using latent heat is possible.
In an ice thermal storage system that enables leveling of power demand by distributed storage of power and has load following capability,
The slurry-like mixed solution obtained by mixing the ice particles and the aqueous brine solution is transferred by a transfer pump through a transfer pipe to a heat exchanger of a cold load, exchanges heat with the heat exchanger, removes heat, and heats up. Return water is returned to the ice storage tank to form a circulation system.

[0003] In the above-mentioned ice heat storage tank, a slurry mixture of ice particles and an aqueous brine solution (hereinafter referred to as an ice-water mixture) coexists with ice and water. The formation of ice blocks due to the floating of ice particles on the surface, the bonding of the floating ice particles, and the melting and recombination of the ice particles are caused, and the problem of ice bridging and arch removal is difficult.

Further, if the above-mentioned ice blocks enter the outlet for taking out the load by the transfer pump, the blockage in the transfer passage is caused to cause a state in which the transfer is impossible. Therefore, if the outlet is located near the bottom of the ice storage tank where the floating density of ice particles is small, the problem of inflow of ice blocks can be avoided, but low-density cold heat with a small ice filling rate will be sent to the load. There is a problem of inefficiency.

For this reason, the take-out port is provided at a position where the floating density of the ice particles has a large value to some extent, and instead, an ice block preventing plate is provided on the wall surface of the ice storage tank around the take-out port to prevent the expected inflow of ice blocks. The inflow of ice blocks is prevented through punching metal provided with a number of holes smaller than the ice blocks provided on the prevention plate. A parallel flow of the ice-water mixture is formed on the prevention plate to prevent clogging of the holes with ice blocks. Therefore, it is necessary to provide a stirrer for forming a stirring flow parallel to the ice block prevention plate.

As a countermeasure against the above problem, a proposal by the present inventors has been disclosed in Japanese Patent Application Laid-Open No. 8-313018. That is, according to the publication, there is a problem of setting an appropriate value of a height of a take-out port to a load of an ice water mixture, a method of mounting an ice block prevention plate provided at the take-out port, a position and a mounting direction of a stirrer, and a setting. Proposals concerning problems at parts are mainly made. First, regarding the problem of the position of the outlet, the required ice filling rate (hereinafter referred to as I) is determined based on the distribution of ice particles in the ice storage tank in the height direction.
PF) is proposed to set an appropriate take-out port for carrying out an ice-water mixed solution having the same size. Then, as shown in FIG. The ice block prevention plate 50 is formed in a cylindrical shape with a bottom from a punching metal having the same, and the ice block prevention plate is externally inserted into a suction pipe 52 projecting inward at right angles to the takeout port 51, and ice water flowing into the takeout port 51 is formed. Internally protruding type ice block prevention that smoothed the flow of the mixture, reduced the sudden inflow pressure applied to the ice block, prevented the ice block from adhering, and allowed the stirrer to blow away the attached ice block even at a position away from the inner wall. A plate mounting method was proposed, and then the mounting position and mounting direction of the stirrer were high without entraining air.
It has been proposed to efficiently stir over IPF lower than F.

Further, another proposal has been made in addition to the above-mentioned proposal for preventing the adhesion of ice blocks. Instead of the complicated process of avoiding the flow of ice blocks into the discharge port, the proposal has a main configuration in which a water area of supercooled water separated from ice particles, which is an ice block forming factor, is separately provided as a main configuration. Means for conveying supercooled water to a load have been proposed. This proposal disclosed in Japanese Patent Application Laid-Open No. 6-229591 discloses a method of forming an ice particle layer composed of ice particle groups 61 by a filter 60 provided in a water area below the upper limit water level as shown in FIG. Cold water is sent to the primary side of the supercooled water production device 62 via the ice particle layer, and the secondary supercooled water 65 is separated from the ice particle layer and stands upright from the upper space toward the bottom of the ice heat storage tank. A part of the supercooled chilled water introduced into the lower part of the ice particle layer is introduced from the lower part 65 of the precipitation pipe into the lower part of the ice particle layer. The dispersion is refluxed.

[0008]

The above-mentioned conventional proposal is based on the premise that ice blocks are generated in an ice heat storage tank. The former relates to preventing ice blocks from adhering to a take-out port, and the latter relates to the existence of ice blocks. Regardless of this, it switched to using cold water, which is a low-density heat storage material. Even if the latter is not allowed to float above an appropriate position below the liquid surface of the ice heat storage tank, it is impossible to prevent the formation of ice blocks if the atmospheric solution is not an antifreeze. On the other hand, the ice particles in the liquid ice-water mixture with fluidity move upward to the top of the ice heat storage tank due to buoyancy, so that the floating density of the ice particles around the outlet to the load is uneven and unstable. is there. Even in such an IPF measurement and IPF control of an ice water mixture, a complicated problem is involved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to prevent the formation of ice blocks in ice storage tanks and to establish means for concentrating the groups of ice particles, and to load the concentrated groups of ice particles into a load. Of the ice particle dispersion maintaining means for uniformizing and constantly stabilizing the floating density of the ice particles around the discharge port, and stabilizing the IP by using both together.
An object of the present invention is to provide an ice storage tank for preventing ice blocks capable of storing high-density cold heat, capable of supplying an ice-water mixture having F to a load, and also enabling measurement and control of IPF in response to a change in load. It is.

[0010]

The gist of the present invention will be described below. The use of a frozen liquid that is soluble in water in the aqueous brine solution prevents ice particles below the liquid surface from forming into ice, and provides a filter for preventing the floating of ice particles at a predetermined position below the liquid surface, so that the ice particles are completely removed. In the antifreeze solution to completely prevent the formation of ice blocks.

The top plate structure of the ice storage tank has an inclined top plate structure of an inverted funnel having a central manhole at the top, and air bubbles mixed in the tank are guided to the liquid level immediately below the manhole via the inclined top plate and discharged to the outside air. As a possible structure, a structure is adopted in which air is not entrained when stirring the ice-water mixture, and the above-mentioned inclined top plate structure prevents random floating and stagnation of ice particles on the liquid surface above the ice storage tank, and prevents the particles from rising to the liquid surface just below the manhole. All the ice particles are concentrated under the inner manhole to form a group of ice particles, and a vertical stirring water area is formed from the concentrated ice particles through a stirrer.
The ice water mixture having the stable IPF is fed to the outlet.

By the formation of the vertically stirred water area, a stable area of the ice-water mixture of IPF is always formed around the take-out of the ice-water mixture to the load. And a means for maintaining the dispersion of ice particles.

Accordingly, the invention of claim 1 is to store a slurry-like ice water mixture comprising ice and an aqueous brine solution, and to use a stirrer for stirring the mixture and an ice storage ice for measuring the ice filling rate of the ice water mixture. An ice heat storage tank equipped with a filling rate measuring device and configured to carry out an ice water mixture from an outlet through a transport pump, and having a configuration in which an ice particle floating prevention filter is provided at an appropriate position below the liquid level of the ice heat storage tank. The brine is characterized by comprising an antifreeze solution soluble in water.

The ice heat storage tank according to the present invention is characterized in that a manhole having a detachable internal manhole is provided on the top of the inclined top plate, and the filter is disposed in the internal manhole. And

Further, the filter according to claim 2 is provided with a supply line for introducing a brine aqueous solution from the bottom of the ice heat storage tank at an upper part thereof, and is immersed in the brine aqueous solution into which the ice particles including the filter have been introduced, and are immersed in air. It is characterized in that a filling chamber for a brine aqueous solution, which is made inaccessible, is formed.

Further, the stirrer according to the first aspect of the present invention is configured to stir up and down the ice particles remaining in the lower part of the filter of the internal manhole to form a vertically stirred water area of the ice water mixture around the outlet. It is characterized by the following.

Further, the stirrer according to the fourth aspect of the present invention is provided so as to be able to be vertically moved up and down so as to be permanently located at a boundary portion between the ice particle layer and the brine aqueous solution which fluctuates according to a change in the ice filling rate. Item 3. An ice heat storage tank for preventing ice blocks from being generated.

Further, the ice storage ice filling rate measuring device according to the first aspect of the present invention is characterized in that the measurement can be performed by lowering the liquid level or the head pressure.

[0019]

Therefore, according to the present invention, since the filter is provided at an appropriate lower liquid level below the upper limit liquid level of the ice heat storage tank, the ice particles rising and floating by the floating force corresponding to the density difference are removed by the filter. And is retained in the aqueous brine solution. In addition, since the brine aqueous solution uses an antifreeze solution soluble in water, there is no occurrence of ice agglomeration due to particle binding between the ice particles that have stayed in the above-mentioned stay.

According to the second aspect of the present invention, the top plate of the ice heat storage tank is formed to have an inclined shape, and a detachable internal manhole is provided at the top of the top plate so that it can be removed when checking the underwater mixer. In addition, since a filter made of perforated metal for preventing floating of ice particles is provided in the inner manhole, the floating ice particles float directly above and are directly contained in the filter in the inner manhole or floated to other parts. Since the ice particles rise along the inclined top plate and fit in the filter in the internal manhole, all the floating ice particles are concentrated on the filter in the internal manhole to form ice particles.

For this reason, with respect to ice particles scattered in various places in the heat storage tank seen in the conventional ice heat storage tank at the time of stirring, which will be described later, some are caused to stir and flow, and some are kept in a stationary state. It does not form an ice-water mixture with a non-uniform IPF.

In addition, due to the above-mentioned inclined top plate structure, air such as air bubbles mixed in the ice water mixture floats in the same manner as the above-mentioned ice particles, and air that floats at a portion other than the internal manhole rises along the inclined top plate. Continuously entering the internal manhole, the air directly floating in the internal manhole is also released through the internal manhole and through the liquid level in the manhole to the outside air, so the air mixed inside stays forever At the time of stirring, air is entrained in the ice-water mixture so that the mixture containing air does not flow into the pump.

According to the third aspect of the present invention, a brine solution filling chamber is formed at the top of the filter, and a supply line for introducing the brine solution stored from the bottom of the ice heat storage tank is provided in the filling chamber. The filter and the ice particles floating and accumulated at the lower part thereof are always immersed in the introduced brine aqueous solution and are in a state where they cannot be brought into contact with air. Ice agglomeration of the ice particles inside can be completely prevented.

According to the fourth aspect of the present invention, when the ice-water mixture is fed to the load from the discharge port by the transfer pump, the operation of the stirrer for the internal manhole causes the removal of the ice particles and the ice particles remaining in the internal manhole. In this manner, a vertically stirred water area can be formed between them, and a uniform IPF ice-water mixed solution can be sent out to the formation outlet. At this time, as described above, since the ice particles that float to form a stagnant pool are limited to the interior manholes, the IPF of the ice water mixture formed by the dispersion of the ice particles is also stable with little variation. Value can be secured.

According to the fifth aspect of the present invention, the stirrer has a structure in which the stirring position can be moved up and down in accordance with the changing ice filling rate, and is always provided at the boundary between the changing ice particle layer and the brine aqueous solution. And the IP of the ice water mixture containing the dispersed ice particle group formed by the stirrer
The variation of F can be suppressed smaller.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not merely intended to limit the scope of the present invention, but are merely illustrative examples unless otherwise specified. Absent. FIG.
FIG. 1 is a diagram showing a schematic configuration of an ice block for preventing ice blocks from being generated according to the present invention.

As shown in FIG. 1, the ice heat storage tank for preventing the formation of ice blocks according to the present invention includes an ice heat storage tank 10, a transport pump 11, an underwater mixer 12, a return water inner pipe 13, a pressure sensor 14
, An internal pipe 19 for taking out an ice water mixture, and an ice maker (not shown). The upper part of the ice heat storage tank 10 includes an inclined top plate 15, a detachable internal manhole 16 provided on the top thereof, and a manhole 17 containing the internal manhole. The internal manhole 16 is provided with a filter 18 for preventing floating of ice particles 20 made of, for example, punching metal. A brine aqueous solution 22a stored at the bottom of the ice heat storage tank is provided in a brine aqueous solution filling chamber formed at the top of the filter. A supply line (not shown) for introducing the water is provided at a low water level below the liquid level 21 of the filling chamber formed in the manhole 17 by a predetermined water level, and the floating ice particles 20 are always contained in the brine aqueous solution 22a. Stagnation, cutting off the contact with the air and preventing the formation of ice blocks.

As the aqueous brine solution, a 6 wt% aqueous solution of antifreeze propylene glycol, which is soluble in water, is used, and the ice particles 20 stay in the aqueous solution so that the ice particles unite with each other to form ice blocks. I do not have it.

The upper part of the ice heat storage tank 10 has an inclined top plate structure or a curved dome shape, and the ice particles 20 and the bubbles 20a which are in contact with the inclined top plate 15 or the curved dome are removed from the inclined top plate 15 or the dome surface. And is guided into the interior manhole 16. Therefore, all of the ice particles 20 which continue to float while floating in the ice water mixture solution 22 including the aqueous brine solution and the ice particles 20 are guided to the lower part of the filter 18 of the internal manhole 16 to form ice particles. In addition, the mixed air and bubbles 20a are also mixed with the ice-water mixed liquid 2.
2 and is guided to the inner manhole 16 like the ice particles, and is discharged from the manhole 17 to the outside air.

A detachable internal manhole 16 built in the inclined top plate 15 or a manhole 17 provided on the top of the curvature dome has a function of enabling use when the underwater mixer 12 is removed, and a function of an internal maintenance window. I also have. The filter punching metal provided in the internal manhole 16 has a certain strength and is configured so that the ice particles 20 do not pass therethrough so that the floating of the ice particles is suppressed so that the brine aqueous solution is always above the ice particle group. It is.

Further, through the transfer pump 11, an inner pipe 19 for taking out the ice-water mixed liquid planted at right angles to the wall surface in the inward direction.
When the ice-water mixture 22 is sent to a load (not shown) to remove heat from the load and return to the inner water pipe 13,
The underwater mixer 12, which is a stirrer, is allowed to move up and down at the boundary between the ice particle layer and the brine aqueous solution that changes in response to the change in the ice filling rate.
A vertical stirring water area is formed between the extraction water area and the group of ice particles staying in the internal manhole 16 so that a uniform IPF ice-water mixture can be sent to the formation extraction port. At this time, as described above, since the ice particles that have floated to form a stagnant pool are limited to the inside of the internal manhole 16, the ice water mixture formed by the dispersion of the floating ice particles in the ice heat storage tank is mixed. The IPF of the liquid can also secure a stable value with little variation.

Incidentally, when the ice storage IPF decreases,
The mixed ice will melt, which will result in a reduction in volume and therefore the level of the liquid. The ice storage IPF can be detected by detecting and measuring the water level drop amount or the head pressure with the pressure sensor 14.

[0033]

The present invention completely prevents the generation of ice blocks in the ice thermal storage tank,
Provided is a low-cost ice heat storage tank that can transport an ice-water mixture having a uniform IPF to a load, and can obtain a stable value without variation in the stored IPF.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an ice heat storage tank for preventing ice blocks from being generated according to the present invention.

FIG. 2 is a diagram showing an attached state of an ice block adhesion preventing plate in a conventional ice heat storage tank.

FIG. 3 is a view showing the usage of an ice particle floating prevention filter in a conventional ice heat storage tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ice heat storage tank 11 Conveyance pump 12 Underwater mixer 13 Return water internal pipe 14 Pressure sensor 15 Inclined top plate 16 Internal manhole 17 Manhole 18 Filter 19 Removal internal pipe 20 Ice particle 20a Bubble 21 Liquid level 22 Ice water mixture 22a Brine aqueous solution

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Hamaoka 2-13-1, Botan, Koto-ku, Tokyo Inside the Maekawa Works Co., Ltd. (72) Inventor Yasushi Toyama 2-3-1, Botan, Koto-ku, Tokyo Stock In company Maekawa Works (72) Inventor Yuko Yoshida 2-13-1, Botan, Koto-ku, Tokyo Inside Maekawa Works

Claims (6)

[Claims] 1. A stirrer for storing a slurry-like ice water mixture comprising ice and an aqueous brine solution and stirring the mixture, and an ice storage ice filling ratio measuring device for measuring an ice filling ratio of the ice water mixture. In the ice storage tank where the ice-water mixture is carried out from the outlet via the transfer pump, a filter for preventing ice particle floating is provided at an appropriate position below the liquid level of the ice storage tank, and brine is soluble in water. An ice heat storage tank for preventing ice blocks from being formed, comprising an antifreeze solution. 2. The ice heat storage tank is provided with a manhole having a built-in detachable internal manhole at the top of the inclined top plate, and the filter is disposed in the internal manhole.
The ice heat storage tank according to claim 1, wherein the ice block is prevented. 3. A supply line for introducing a brine solution from the bottom of the ice heat storage tank at an upper portion of the filter,
3. The ice heat storage tank according to claim 2, wherein a chamber is filled with an aqueous brine solution that is immersed in an aqueous brine solution into which ice particles including a filter are introduced and is inaccessible to air. 4. The stirrer is configured to stir up and down a group of ice particles stagnating in a lower portion of a filter of the internal manhole to form a vertically stirred water area of a slurry-like ice water mixture around the outlet. The ice heat storage tank according to claim 1, wherein the ice block is prevented. 5. The stirrer according to claim 4, wherein the stirrer is provided so as to be able to vertically move up and down so as to be permanently located at a boundary portion between the ice particle layer and the brine aqueous solution which changes in response to a change in the ice filling rate. Ice thermal storage tank for preventing ice blocks. 6. The ice heat storage tank according to claim 1, wherein the ice storage ice filling rate measuring device is capable of measuring a drop in liquid level or a head pressure.