JP2003056951A - Ice slurry continuous making method and continuous ice making heat storage system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous ice making method and a continuous ice making heat storage system therefor capable of minimizing the adhesion of ice to the cooling pipe inner wall of a heat exchanger and eliminating the blocking of the cooling pipe by the ice upon ice making. SOLUTION: The ice slurry continuous making system is constituted of an ice making machine 10 equipped with a cold heat source or a refrigerating cycle 25, an ice storage tank 14, a brine circulation passage 12 for connecting the ice storage tank 14 to the ice making machine 10, a cold heat load 22, and an ice slurry supplying circulation passage 23 for connecting the cold heat load 22 to the ice storage tank 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous ice making method for sherbet-like ice slurries used in an ice heat storage system and an ice making heat storage system therefor, and more particularly, to a minimum adhesion of ice to the inner wall of a cooling pipe for producing ice slurries. In particular, the present invention relates to an ice slurry continuous ice making method capable of performing ice making while preventing the cooling pipe from being blocked by ice holding and a continuous ice making heat storage system thereof.

[0002]

2. Description of the Related Art As a conventional continuous ice-making method for ice slurries, a supercooling-released ice-making method, a scraping-type ice-making method, a fluid-peeling ice-making method, and a pipe continuous method are known.

The supercooling release method is a method of producing supercooled water in a heat exchanger and using a collision plate or seed ice at the outlet to release the supercooled water. In the above method, since it is necessary to maintain an unstable supercooled state in the heat exchanger, fresh water that does not contain impurities and is easy to maintain a stable supercooled state is normally used. Therefore, it is difficult to maintain a stable supercooled state as an ice making method of low-temperature heat storage of less than 0 ° C. using brine in which many impurities are mixed. Also, when brine is used, the decrease in the ice making temperature must be considered because the brine concentration changes due to the increase in the ice storage amount, and this method requires fine supercooling temperature control Also has a problem.

As the scraping ice-making method, a large number of ice-making machines such as a Mueller ice-making machine and a Sunwell ice-making machine are known. Although it has a proven track record as an ice making method for ice slurries using brine, it has a problem in durability because it is a method for mechanically scraping the ice adhering to the cooling surface.

The fluid peeling type ice making method is a method for making ice by using a smooth material having a small thermal conductivity such as resin as a heat transfer surface. In this method, the ice generated on the cooling surface is continuously separated by the fluid, but since the resin is used, the heat transfer performance is low and there is a problem in practical use.

In the continuous pipe ice making system, D is used as brine.
Some also use 25 wt% sorbitol.
In this method, there is a method of supplying seed ice together with brine from an ice storage tank into the pipe of a shell and tube heat exchanger. Basically, it is a method to remove the ice adhering to the cooling pipe, but the condition for continuous ice making in the heat exchanger is limited to laminar flow, because a sufficient amount of seed ice is not supplied from the ice storage tank. When turbulent flow with high heat transfer performance is used, there is a problem that ice is not discharged from the heat exchanger in a supercooled state.

Various proposals have been made to solve the above problems. For example, Japanese Patent Laid-Open No. 5-346243 proposes the following under the name "ice heat storage system". This proposal was made to prevent the adhesion of ice generated in the heat transfer tubes used for ice slurry production to efficiently produce sherbet-like ice. As shown in FIG. 7, according to this proposal, a large number of heat transfer tubes 53 are arranged in parallel in the vertical direction, and the upper portion of an ice maker 51 composed of a heat exchanger is connected to the ice slurry passage 5.
2 communicates with the upper part of the heat storage tank 57 that stores the heat storage brine 56, and the lower part of the heat storage tank 57 and the ice maker 51.
And a lower part of the pipe are connected by a brine supply pipe 59 to supply the cooling brine 56 to the outside of the heat transfer pipe 53, while supplying bubbles to the heat storage brine 56 supplied into the heat transfer pipe,
Cooling brine 5 from outside the heat transfer tube 53 while stirring.
It is a heat storage system that is cooled by 8.

The bubble is supplied to the heat storage brine 56 by a brine chamber 60 provided in the lower portion of the ice maker 51.
A perforated plate 61 is provided inside, and outside air is blown into the outer perforated plate 61 through a small compressor 63 from a nozzle 62 disposed below the outer perforated plate 61, and bubbles are formed by passing through the perforated plate 61 to form a heat storage brine 56. It is configured to mix while being stirred. (Refer to enlarged view A) Further, the refrigeration cycle 65 of the cooling brine 58 includes the compressor 66 and the condenser 6.
7, the expansion valve 68, the evaporator 69, the heat storage tank 5
Cooling heat is supplied to the cooling load 70 from the lower part of 7 through the pump 71.

According to this proposal, as a function and effect, in order to prevent the adhesion of ice in the heat transfer tube, air bubbles are mixed in the heat storage brine, and the heat transfer tube is promoted by stirring caused by the mixture of the air bubbles. It is described that crystallization of ice is promoted by homogenizing the temperature inside. However, heat loss due to air bubbles is large, and dust in the air is captured and contaminated by brine, and there is a problem of corrosion due to oxygen content present in the brine.

[0010]

As described above, various proposals have been made for the continuous ice making of ice slurries, but in the production of ice slurries, the pipe continuous method enables more stable ice making. Has advantages over other methods. However, as shown in FIG. 8, it is feared that the ice 75a may adhere to the inner wall of the cooling pipe 75 to cause blockage. Therefore, it is complicated to rotate the whiplot 76 in the direction of arrow A to remove the ice. Need to install a removal device.
Although the adhesion of ice to the inner wall is said to be the only drawback, this point has not yet been fully resolved.

The present invention has been made in view of the above-mentioned problems, and during ice making, continuous ice making in which the adhesion of ice to the inner wall of the cooling pipe of the heat exchanger is minimized and the cooling pipe is not clogged by ice is eliminated. It is intended to provide a method and its continuous ice storage system.

[0012]

Therefore, in the continuous ice making method of the present invention, in the continuous ice making method of the ice slurry, the brine aqueous solution is circulated and circulated through the inside of the cooling pipe, and in the circulation process,
A supercooled liquid phase is formed, and a part of the ice slurry from the brine outlet of the ice maker is supplied to the supercooled liquid phase as seed ice to generate fine ice with the seed ice as a nucleus, and continuous ice making is performed. It is characterized by doing so.

In order to minimize the adhesion of ice to the inner wall of the cooling pipe, which is the object of the present invention,
Use of a brine aqueous solution that is a good solution of ice peeling and facilitates the growth of fine ice in a liquid phase, such as potassium formate aqueous solution, and circulates and refluxs the brine aqueous solution in a cooling pipe to deposit and grow ice crystals on the wall surface. It suppresses the generation and puts it in a supercooled state to easily generate ice crystals even in the presence of minute nuclei,
While supplying seed ice to such a supercooled liquid phase to generate ice crystals with the seed ice as a nucleus in the supercooled liquid phase in the circulation flow, while suppressing the adhesion of ice on the inner wall of the cooling pipe, It enables continuous ice making. In addition, the brine solution containing seed ice fed into the cooling pipe uses turbulent flow with excellent dispersion of seed ice and excellent heat transfer performance.

Further, the brine solution according to claim 1 is characterized in that polymer spheres or metal particles such as zirconia and alumina are mixed.

The invention according to claim 2 describes the mixture of polymer spheres or metal particles in the brine aqueous solution, and the mixture allows the spheres to adhere to the inner wall of the ice while passing through the cooling pipe. It is made to collide, and as a result, collision separation is caused efficiently.

In the continuous ice making process according to the first aspect of the invention, the ice removing process of the ice adhering to the inner wall of the cooling pipe is intervened, and the ice making and the ice removing are alternately combined. To do.

According to the third aspect of the present invention, when ice adheres to the inner wall of the cooling pipe to cause clogging of the cooling pipe or deterioration of heat transfer characteristics, the deicing can be efficiently performed in a short time. It is a thing. In continuous ice making, it is necessary to efficiently continue the ice making operation for a long time, and when the blockage etc. occurs, the short-time de-icing process with warm brine is performed by alternate operation with multiple intervening operations. Is described.

The deicing according to claim 3 is started by detecting a decrease in the circulation amount of the brine aqueous solution, and the deicing is ended by the differential pressure between the inlet and outlet of the cooling pipe. .

The invention according to claim 4 describes means for shifting from the ice making process to the de-icing process and for stopping de-icing. The ice making process is performed in the liquid phase circulating in the heat exchanger, but the de-icing process is caused by the growth of the adhered ice in the cooling pipe because the ice that has adhered and grown on the cooling pipe wall increases with the passage of time. When the amount of brine brine circulation is decreased, it is carried out in the case of being placed below a predetermined set value, and the deicing operation is finished by detecting the differential pressure at the inlet and outlet of the cooling pipe.

In a preferred ice slurry continuous ice making system using the invention according to any of claims 1 to 4, cold heat is supplied to the brine aqueous solution flowing through the cooling pipe of the heat exchanger to generate ice slurry. Consists of an ice maker with a refrigeration cycle, an ice storage tank that stores the ice slurry that was made, and a cold heat load that uses the ice slurry that was stored, and the brine deprived of the cooling load is returned to the ice storage tank. In the continuous ice-making system described above, the ice-maker uses a liquid-filled shell-and-tube heat exchanger containing a plurality of the cooling tubes, and the brine aqueous solution is cooled from the outside of the tube via a refrigerant. Between the ice container and the ice storage tank, a pipe that carries the brine containing the generated ice slurry into the ice storage tank from the brine outlet of the ice making machine, and an ice making machine outlet from the brine outlet of the ice making machine. A conduit for circulating the ice slurry supplying seed ice to the in the inlet, characterized in that it has a more composed brine circulation path provided configuration as the conduit for circulating the brine solution to ice maker brine inlet from ice bath.

The invention according to claim 5 is the first aspect of the present invention.
The invention according to claim 1, which is the invention, describes a preferred ice making system using the ice slurry continuous ice making method according to any one of claims 1 to 4, wherein the continuous ice making system is equipped with a refrigeration cycle for supplying cold heat for ice. And an ice storage tank for storing the ice-slurry produced, and a cold heat load for returning the brine solution deprived of heat using the stored ice slurry to the ice storage tank. The ice maker uses a liquid-filled shell-and-tube heat exchanger containing a plurality of the cooling tubes, and a brine aqueous solution that turbulently flows through the tube is liquefied from the outside of the tube into the brine aqueous solution through a refrigerant. It is configured to cool to a phase supercooling state, a brine circulation path is provided between the ice maker and the ice storage tank, and an aqueous brine solution in which seed ice is dispersed and mixed from the ice storage tank via the circulation path is made in the ice maker. Send to the brine inlet to form liquid phase supercooling in the ice maker, generate and grow ice crystals with seed ice mixed in the liquid phase as core, and store the brine containing ice slurry from the brine outlet of the ice maker. It is transported to the tank, and part of it is transported as seed ice directly to the brine inlet of the ice maker via the circulation path. On the other hand, the brine containing the ice slurry sent to the ice storage tank is separated into the ice slurry and the brine aqueous solution in the ice storage tank, and the separated brine aqueous solution is the ice slurry for seed ice in the process of being conveyed through the circulation path. The seed ice is mixed and mixed with the contained brine, and then the seed ice is directed toward the ice maker again.

In other words, the brine aqueous solution introduced into the ice making machine forms the seed ice, which is the nucleus of ice crystal formation in the liquid phase, in the brine circulation path as described above. The initial generation of seed ice is performed by releasing the supercooling using the impact of the rotary vanes of the circulation pump, and the seed ice is generated after the ice slurry is generated in the ice maker, and a part of the ice slurry is washed with brine. It is performed by mixing in an aqueous solution.

The brine solution according to claim 5 is characterized in that polymer spheres or metal particles such as zirconia and alumina are mixed.

According to the sixth aspect of the invention, polymer spheres or metal particles are mixed in the brine aqueous solution during the ice making in order to promote the detachment of the ice adhering to the inner wall of the cooling pipe of the ice maker.

Further, the brine circulation passage according to claim 5 is provided with a warm brine supply source, the ice making by the ice maker is stopped at the time of deicing, and the warm brine is supplied from the brine supply source through the brine circulation passage. It is characterized in that the cooling pipe is circulated to perform deicing.

In the invention according to claim 7, a hot brine supply source using the condensation heat of the refrigeration cycle as a heat source is provided in the brine circulation path, and at the time of deicing, the hot brine of about 14 ° C. is excluded from the ice storage tank. Is circulated to remove ice adhered to the inner wall of the cooling pipe of the ice maker.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described together with the illustrated example. However, unless otherwise specified, the dimensions, shapes, relative positions, etc. of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Absent. The present invention will be described in detail below with reference to the drawings. 1 is a diagram showing a schematic configuration of an ice slurry continuous ice making system of the present invention, and FIG. 2 is a diagram showing a schematic configuration of the ice making device of FIG. FIG. 3 is a diagram showing a schematic configuration of the ice making circulation line of FIG. 1, and FIG.
FIG. 5 (A) is a diagram showing a schematic configuration of the deicing circulation line of FIG.
Is a conceptual diagram of in-pipe ice making (using a double pipe) used in the present invention, and (B) is a conceptual diagram of in-pipe ice making (using a double pipe) when collision separation occurs due to a solid ball.

FIG. 1 is a diagram showing a schematic construction of an ice slurry continuous ice making system of the present invention. As shown in the figure, the ice slurry continuous ice making system of the present invention includes an ice maker 10 having a refrigeration cycle 25 forming a cold heat source, an ice storage tank 14, and a brine circulation connecting the ice storage tank 14 and the ice maker 10. Road 12
A cold load 22, the cold load 22 and the ice storage tank 14
It is composed of an ice slurry supply circulation path 23 that connects with.

The ice maker 10 includes a cooling pipe 1 inside a body 32.
A liquid-filled shell-and-tube heat exchanger containing a plurality of 1 is used, and as shown in FIG. 2, the refrigerant is supplied to the outside of the cooling pipe 11 through the refrigerant inlet 31a and the outlet 31b provided in the body 32. In addition to the supply, the brine for ice making is introduced into the cooling pipe 11 through the brine inlet 30a, and the brine containing the ice slurry is delivered through the brine outlet 30b.

The refrigeration cycle 25 for sending the refrigerant to the ice maker 10 includes a condenser 25 having a cooling tower 25d.
a, receiver 25b, compressor 25c, expansion valve 25e,
The surge drum 10a is a main component, and the compressor 25c
The refrigerant gas compressed by the condenser 25a is condensed by the condenser 25a, and the condensed condensate is passed through the receiver 25b and the expansion valve 25.
The ice-making brine that flows through the inside of the cooling pipe 11 is adiabatically expanded by the ice-making device 10 that is an evaporator via e.

The ice storage tank 14 is provided with an inlet port 15a for introducing brine containing ice slurry delivered from the brine outlet 30b of the ice making machine 10 on the lower side thereof, and an ice making brine extraction pipe 15b provided on the opposite side, The brine aqueous solution is sent from 15c to the brine inlet 30a of the ice maker 10. The seed ice is configured to use a part of the ice slurry of the brine outlet 30b of the ice maker 10, and the brine outlet 30b of the ice maker 10 is supplied via the ice making pump 12a.
It is introduced and circulated to the brine inlet 30a of the ice maker 10 via the path of the pipe 12c, the seed ice supply pipe 12h, and the pipe 12f, and an appropriate amount of seed ice is adjusted by adjusting the valves 12e, 12d, and 12g. I am doing it. In addition,
In the ice storage tank, a spray nozzle 14a for spraying return brine deprived of heat from the cold load 22 from above, and a delivery pipe line for spraying water from the bottom of the tank through the brine extraction pipe 15c to the top to circulate the brine aqueous solution. 17 is provided.

The brine circulation path 12 includes a pipeline 12c connecting the brine outlet 30b of the ice maker 10 and the inlet 15a of the ice storage tank 14, and a seed ice supply pipeline 12h including a valve 12g.
And a conduit 12f connected to the delivery conduit 17, the seed ice supply conduit 12h, and communicating with the brine inlet 30a of the ice maker. The pipe 12f is provided with an electromagnetic flow meter 12b, an ice making pump 12a, and a deicing warm brine tank 13 that forms a deicing warm brine supply source.
A differential pressure detection circuit 11a for the inlet and outlet of 0 is provided. In addition,
The heat source of the warm brine is configured to use the heat of condensation of the condenser 25a of the refrigeration cycle 25.

The cold load 22 includes a delivery pipe 18 for delivering the ice slurry 21 from the ice storage tank 14 and the spray nozzle 14.
ice slurry supply circulation paths 23, 23 connecting with a are provided,
The ice slurry 21 stored in the ice storage tank 14 is supplied to the cold heat load by the transfer pump 21a provided in the delivery pipe line 18.

As described above, in the ice making in the ice maker 10, a part of the ice slurry of the brine outlet 30b of the ice maker 10 is supplied to the brine inlet 30a of the ice maker to mix the formed seed ice. While introducing the turbulent ice-making brine 40a into the cooling pipe 11 of the ice making device 10,
As shown in FIG. 5 (A), the mode of the introduced brine in the cooling pipe 11 is that the turbulent ice-making brine is efficiently cooled to form a liquid phase supercooled state. Since the ice making brine 40a contains seed ice in a proper mixture as described above, the ice crystals 37 forming the ice slurry grow in the liquid phase with the seed ice mixed in the liquid phase as a nucleus. The grown ice produces brine 40b containing ice slurry. The formation of ice crystals inside the liquid phase suppresses the adhesion of ice on the cooling pipe 11 to an extremely small level. Further, as shown in FIG. 5B, when the polymer spheres 36 are mixed in the ice making brine 40a, even if the ice crystals 37 adhere to the inner wall of the cooling pipe 11,
The adhered ice causes impact peeling by the polymer spheres 36, and the adhered ice can be minimized. In addition,
In this case, the particle separator 11b is provided between the brine inlet 30a of the ice maker 10 and the brine outlet 30b of the ice maker 10.
Is provided, and the polymer spheres 36 are separated from the brine containing the ice slurry sent out from the brine outlet and the particles and refluxed to the brine inlet 30a, and the brine containing the remaining ice slurry is supplied to the pipeline 12c of the brine circulation passage 12. I am sending it to. The refluxed polymer spheres 36 are in the conduit 1
The seed ice fed from 2f is introduced into the cooling pipe 11 of the ice maker 10 together with the brine aqueous solution in which the seed ice is mixed.

In order to suppress the adhesion of ice to the inner wall of the cooling pipe in the above ice making process, the inner wall of the cooling pipe may be a sanitary pipe finished to be smooth without any unevenness. An aqueous potassium formate solution is used, which makes it easy for fine ice to grow.

In the ice slurry continuous ice making system having the above-mentioned structure, since continuous ice making for a long time may lower the ice making efficiency due to the adhesion of ice to the inner surface of the cooling pipe 11, as shown in FIG. The flow rate of the flowing ice-making brine was measured by the electromagnetic flow meter 12b, and the predetermined limit value (300 L /
When the temperature is reduced to (min), the ice making process A is transferred to the deicing process B, and deicing is performed for about 10 minutes by using the warm brine at about 14 ° C. from the warm defrosting brine tank 13 shown in FIG. When the detected value is detected through the differential pressure detection circuit 11a shown in FIG. 1 and drops below a predetermined value, the ice making process A is resumed, and the processes of A and B are alternately repeated. There is. As shown in FIG. 6, in this embodiment, 2
During the operation of 0 hours, the de-icing operation is switched about 17 times each for about 17 minutes. Also, by using warm brine, the time required for de-icing, re-cooling and start of re-ice making can be suppressed from 25 minutes to 11 minutes in the past, and more efficient ice making can be continued by inserting the de-icing process. .

FIG. 3 shows the flow of the circulation line in the above ice making process. In this case, the brine including the ice slurry discharged from the brine outlet 30b of the ice making device 10 flows through the pipeline 12c of the brine circulation passage 12. Through the seed ice supply conduit 12h, a part of which includes the valve 12g, and the ice maker 1
The remainder is introduced into the ice storage tank 14 through the inlet port 15a of the ice storage tank 14 to the brine inlet 30a of 0. The brine aqueous solution for ice making is mixed from the brine extraction pipe 15c or the ice making brine extraction pipe 15b with the ice slurry of the seed ice supply pipe 12h through the delivery pipe 17, and through the pipe 12f, the brine inlet of the ice making device 10. The ice making pump 12a is fed into 30a to perform the ice making shown in the figure. In this case, the valves 13a and 13b are closed to prevent the hot brine from flowing out of the warm brine tank 13 to the ice maker 10. In addition, by using warm brine, the time required for de-icing, re-cooling, and start of re-ice making can be reduced from the conventional 25 minutes to about 11 minutes, and more efficient ice making can be continued by inserting the de-icing process. .

FIG. 4 shows the flow of the circulation line in the deicing process. In this case, the brine circulation path 1 is used.
The second valve 12d, 12e is closed, and the valve 13a, 1
3b is opened, and warm brine is sent from the warm brine tank for deicing to the brine circulation path 12 which includes the ice making machine and excludes the ice storage tank 14, and is circulated. After shifting to the deicing process by detection, the deicing operation is stopped via the differential pressure detection circuit 11a.

[0039]

With the above structure, it is possible to generate and grow ice crystals in the liquid phase, to continuously make ice slurry, and to prevent ice from adhering to the inner wall of the cooling pipe. Also,
By using warm brine, the time required for de-icing, re-cooling, and start of re-ice making can be suppressed from the conventional 25 minutes to about 11 minutes, and more efficient ice making can be continued by inserting the de-ice process.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an ice slurry continuous ice making system of the present invention.

FIG. 2 is a diagram showing a schematic configuration of the ice maker of FIG.

FIG. 3 is a diagram showing a schematic configuration of the ice making circulation line of FIG. 1.

FIG. 4 is a diagram showing a schematic configuration of a deicing circulation line in FIG.

FIG. 5A is a conceptual diagram of ice making in a pipe used in the present invention, and FIG. 5B is a conceptual diagram of ice making in a pipe when collision separation occurs due to solid balls.

FIG. 6 is a diagram showing a situation of a long-time continuous ice making operation in FIG. 1.

FIG. 7 is a diagram showing a schematic configuration of a conventional ice heat storage system.

FIG. 8 is a diagram showing a general condition of ice making in the case of the conventional scraping-type ice making.

[Explanation of symbols]

10 ice maker 11 cooling pipes 11a Differential pressure detection circuit 12 Brine circuit 12a Ice making pump 12b Electromagnetic flow meter 12h seed ice supply line 13, 24 Dehydrated hot brine tank 14 Ice storage tank 14a spray nozzle 15a inlet 15b Brine extraction tube for ice making 15c brine extraction tube 17, 18 Delivery line 21 ice slurry 22 Cold load 23 Ice slurry circulation supply channel 25 Refrigeration cycle 32 torso

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tasuke Igarashi             2-82 Watanabe Dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture               Kyushu Electric Power Co., Inc. (72) Inventor Kosaku Nishida             2-13-1, Peony, Koto-ku, Tokyo Stock market             Shamaegawa Works (72) Inventor Kazutoshi Ito             2-13-1, Peony, Koto-ku, Tokyo Stock market             Shamaegawa Works (72) Inventor Hidetoshi Okubo             4-14-21 Narusedai, Machida-shi, Tokyo F-term (reference) 3L110 AA00 AC01

Claims (7)

[Claims] 1. In a continuous ice making method of an ice slurry, an aqueous brine solution is circulated and circulated inside a cooling pipe to form a supercooled liquid phase in the circulating process, and a supercooled liquid phase is formed from an outlet of an icemaker brine outlet during the supercooled phase. An ice-slurry continuous ice-making method, characterized in that a part of the ice-slurry is supplied as seed ice, and the seed ice is used as a core to generate fine ice to perform continuous ice-making. 2. The method for continuously making ice slurry according to claim 1, wherein the brine aqueous solution contains a mixture of polymer spheres or metal particles such as zirconia and alumina. 3. The ice making process of the continuous ice making process involves an ice removing process because the amount of ice attached and grown on the inner wall of the cooling pipe increases.
The method for continuously making ice slurry according to claim 1, wherein ice making and de-iceing are alternately combined. 4. The deicing is started when a decrease in the circulating amount of the brine aqueous solution is detected and is below a predetermined set amount, and the deicing is ended by a differential pressure between the inlet and outlet of the cooling pipe. The method for continuously making ice slurry according to claim 3, wherein 5. An ice making machine equipped with a refrigeration cycle for supplying cold heat to an aqueous brine solution flowing through a cooling pipe of a heat exchanger to produce ice slurry, an ice storage tank for storing the ice slurry produced, and an ice storage tank. In the continuous ice making system, which comprises a cold load using ice slurries, and the brine deprived of the cooling load is returned to the ice storage tank, the ice maker has a liquid-filled shell containing a plurality of the cooling tubes. An and tube type heat exchanger is used to cool the brine solution from the outside of the tube through a refrigerant, and the brine containing the generated ice slurry is put between the ice maker and the ice storage tank. From the ice maker to the ice storage tank, a pipeline to circulate the ice slurry that supplies seed ice from the ice maker's brine outlet to the ice maker's brine inlet, and an aqueous brine solution from the ice storage tank. Ice slurry continuous ice thermal storage system, characterized in that the more becomes brine circulation path provided structure and pipe to reflux until vessels brine inlet. 6. The ice-slurry continuous ice storage system according to claim 5, wherein the brine aqueous solution has a structure in which polymer spheres or metal particles such as zirconia and alumina are mixed. 7. A hot brine supply source is attached to the brine circulation path, the ice making by an ice maker is stopped at the time of de-icing, and the hot brine is circulated from the brine supply source through the brine circulation path in the cooling pipe. The ice-slurry continuous ice storage system according to claim 5, wherein the ice-slurry continuous ice-storage system is configured to perform de-icing.