JP6542814B2 - Ice storage tank and sherbet ice ice making system - Google Patents

Description

The present invention relates to ice storage tanks and ice making systems for sherbet ice .

  There is a technology to make sherbet ice used for keeping freshness of marine products and the like. For example, Patent Document 1 discloses an ice generator that delivers inflowing salt water as ice, a small volume ice making tank for making sherbet ice with a constant sherbet concentration, a constant ice made by an ice making tank and an ice generator. Sherbet ice ice making a sorbet ice by a storage tank having a larger capacity than the ice making tank for storing sorbet ice of sorbet concentration and capable of constantly providing sorbet ice of constant sorbet concentration from the initial stage of storage A method is disclosed. Further, for example, Patent Document 2 discloses a technology for storing ice and slurry made by a subcooler in an ice heat storage tank.

Patent No. 5325510 gazette JP, 2009-168369, A

  As a technique to make sherbet ice used for keeping freshness of fishery products and the like, the brine supplied in the cooler is cooled by a coolant and ice is formed by scraping off the ice making layer formed on the inner wall of the cooler with a scraper. There is an ice generator to generate (for example, patent document 1). However, in this conventional ice generator, since ice is generated by scraping off the ice making layer formed on the inner wall surface of the cooler with ice, the sherbet ice to be made ice has a diameter of ice crystal grains of about 0.2 mm. Met. In addition, since the ice making layer was peeled off with a scraper, the shape of ice crystal grains was likely to vary. In addition, the ice crystal grains were easily condensed and easily enlarged. On the other hand, it is more preferable that the sherbet ice used for maintaining the freshness of aquatic products etc. has a small diameter of ice crystal grains, uniform ice crystal grains, and is further difficult to be enlarged.

  An object of the present invention is to provide a technique for producing saltwater sherbet ice in which the diameter of ice crystal grains is smaller than before, the ice crystal grains are uniform, and the ice crystal grains are less likely to be enlarged.

  In order to solve the problems described above, the present invention is to make salty sherbet ice by applying the supercooling type ice making technology which the present applicant has cultivated for many years with ice storage for air conditioning.

  More specifically, the present invention relates to an ice making apparatus for supercooling brine, releasing supercooled brine, and producing sherbet ice having a diameter of ice grains of 0.01 to 0.1 mm; An ice ice making system for a sherbet ice comprising: a supply device for storing ice made sherbet ice and supplying sherbet ice having a diameter of ice grains of 0.01 to 0.1 mm;

According to the ice making system of the sherbet ice according to the present invention, the diameter of the ice crystal grains of the sherbet ice made by supercooling the salt water and releasing it is 0.01 to 0.1 mm. The diameter of can be made smaller than before. The diameter of ice crystal grains means the maximum diameter when the ice crystal grains are other than spherical. Moreover, the surface of the ice crystal grains is curved and the grains are uniform, and the ice crystal grains are hardly coagulated with each other, so that the sherbet ice made by the ice making system of the sherbet ice according to the present invention is hard to grow. As a result, the sherbet ice has better fluidity than before. Therefore, clogging of piping and the like is unlikely to occur, and sherbet ice can be supplied with power smaller than that of the prior art. Further, according to the ice making system of sherbet ice according to the present invention, it is possible to make the value of ice packing factor (IPF) at the time of ice storage larger than that of the prior art. Specifically, IPF is 25 to 30% in the technology of scraping off the ice making layer generated on the inner wall surface of the conventional cooler with a scraper, but in the ice making system for sherbet ice according to the present invention, IPF is 50 to 60%. can do. Therefore, the ice storage tank can be miniaturized as compared with the conventional case. Moreover, according to the ice making system of the sherbet ice which concerns on this invention, the sherbet ice of salt concentration lower than before can be ice-made. Specifically, in the technology of scraping off the ice making layer generated on the inner wall surface of the conventional cooler with a scraper, the corresponding salt concentration is 1.0 to 3.5% (3.5% corresponds to the seawater salt concentration) there were. On the other hand, the sherbet ice making system according to the present invention can also make sherbet ice having a salt concentration of less than 1%, and can make sherbet ice having any salt concentration. In addition, in the technology of peeling the ice making layer formed on the inner wall surface of the conventional cooler with a scraper, failure of the ice generator is likely to occur, which is considered to be a load at peeling, such as breakage of the scraper blade. Was concerned. In addition, maintenance was also a burden. On the other hand, in the sherbet ice ice making system according to the present invention, since there is no load at the time of peeling, there is little failure of the system and maintenance is easy. Furthermore, by using the sherbet ice ice-made by the sherbet ice ice making system according to the present invention to maintain the freshness of the aquatic product etc., the quality of the aquatic product etc. can be maintained longer than before.

  Sherbet ice can be suitably used for aquatic products where freshness maintenance in salt water is required. The marine products are exemplified by fish (eg, saury, tuna, horse mackerel, mackerel, etc.) and crustaceans (eg, crab, shrimp). These are examples, and aquatic products are not limited to these.

  Here, the ice making apparatus may bring the seawater into the subcooling state and release the seawater in the subcooling state. According to the present invention, seawater can be used to make sherbet ice of seawater. The seawater is preferably sterile seawater. Moreover, it is more preferable that seawater is the sterilizing seawater by which salt adjustment was carried out. Salt adjustment can be adjusted by mixing fresh water with seawater. The concentration of salted sterile water can be adjusted according to the aquatic product. The concentration of the salted sterilized seawater may be lower than the seawater concentration (e.g., 3.5%), for example, 3% or less.

  Further, the ice making apparatus is connected to a forward pipe through which salt water flows, a heat exchanger connected to the forward pipe, and brings the salt water into a subcooling state, a return pipe through which the salt water in the subcooling state flows, and a connection to the return pipe. An ice storage tank for storing sherbet ice made by the ice making apparatus, and a pump for pumping the sherbet ice stored therein, and the release device for releasing the supercooled salt water; And a supply pipe connected to the ice storage tank and the pump and through which the sherbet ice flows.

  The forward pipe can be connected at one end to the ice storage tank and at the other end to the heat exchanger. In the forward piping, salt water from the ice storage tank can be flowed. The salt water from the ice storage tank is the raw water temperature-reduced by the ice storage tank. In the forward piping, the pump of the ice making equipment that pumps up the salt water in the ice storage tank and pumps it to the heat exchanger, the preheater that melts fine ice contained in the salt water from the ice storage tank, various valves, thermometers, flow meters, etc. At least one of the above may be further provided. The supercooling water pump may be inverter-controlled to make the flow rate supplied to the heat exchanger constant.

The heat exchanger exchanges heat between the subcooling medium (such as water and brine) supplied from the refrigerator and the saltwater to bring the saltwater into a subcooling state. As the heat exchanger, various heat exchangers can be used including plate type and shell and tube type. The releaser releases the supercooling state by, for example, ultrasonic waves. The releaser is not limited to the above as long as it can release the subcooling state. The return pipe can be connected at one end to the heat exchanger and at the other end to the releaser. The return pipe may further be provided with at least one of various valves, a thermometer, a flow meter, and the like.

  The ice storage tank stores ice-made sherbet ice and can be configured to have a stirring unit. By having the stirring part, the ice storage tank can suppress the condensation of the ice contained in the sherbet ice and maintain the fluidity of the sherbet ice. In the sherbet ice ice making system according to the present invention, the IPF of the ice storage tank can be 50 to 60%. The stirring unit can be configured to include a shaft, a wing connected to the shaft, and a motor for rotating the shaft. The ice storage tank includes a raw water inlet for receiving salt water (raw water), a raw water outlet for discharging raw water, an ice inlet for receiving sherbet ice, an ice outlet for discharging sherbet ice, and an ice outlet for discharging remaining sherbet ice. It can be done. In addition, the ice storage tank accommodates the sherbet ice in the tank in the area on the ice outlet side and allows salt water to pass through (for example, a plate having a plurality of holes formed therein, a mesh, or the like) And the like) can be included. By having the partition part, the ice storage tank can suppress that ice is mixed in the salt water sent to the subcooler.

  The pump pumps the stored sherbet ice. Since the sherbet ice made by the sherbet ice making system according to the present invention is excellent in fluidity, the pump according to the present invention can supply sherbet ice with less power than before. The pump according to the present invention does not have to be a dedicated pump for pumping slurry-like liquid, and a general-purpose pump for pumping water can be used. The supply pipe can be connected at one end to the releaser and at the other end to the supply destination, and an ice storage tank or a pump can be provided in the middle of the pipe. The supply piping includes a first supply piping whose one end is connected to the releaser and the other end is connected to the ice storage tank, and a second supply piping whose one end is connected to the water storage tank and the other end is connected to the supply destination May be. The supply pipe may further be provided with at least one of various valves, a thermometer, a flow meter, and the like.

  The ice making system for sherbet ice according to the present invention comprises an ice making apparatus, a supply apparatus, a heat exchanger and a releaser constituting the ice making apparatus, an ice storage tank and a pump constituting the supply apparatus, and a control unit for controlling various valves. Furthermore, it is good also as composition provided.

  The present invention can also be specified as the above-described ice making device. Moreover, this invention can also be specified as a supply apparatus mentioned above.

  Here, the present invention can also be specified as a method of ice making of sherbet ice. For example, according to the present invention, an ice making step of supercooling brine, releasing supercooled brine, and making ice of sherbet ice having a diameter of ice grains of 0.01 to 0.1 mm, and ice making in the ice making step And storing the sorbet ice and supplying the sorbet ice having a diameter of ice grains of 0.01 to 0.1 mm.

According to the ice making method of sherbet ice of the present invention, the diameter of ice crystal grains can be made smaller than before. In addition, the sherbet ice made by the ice making method of the sherbet ice according to the present invention has the same shape and size of ice crystal grains, and the ice crystal grains are hard to condense with each other, so it is hard to be enlarged. As a result, the flowability of the sherbet ice is superior to that of the prior art, clogging of piping and the like is less likely to occur, and the sherbet ice can be supplied with power smaller than that of the conventional case. Moreover, the value of the ice filling rate (IPF) at the time of ice storage can be made larger than before. In addition, it is possible to make sherbet ice of a lower salinity concentration than conventional. Furthermore, by using the sherbet ice made by the ice making method of the sherbet ice according to the present invention for maintaining the freshness of the water product etc., the quality of the water product etc. can be maintained longer than before. The ice making method of sherbet ice according to the present invention may simply include the above-described ice making process. Moreover, the ice making method of sherbet ice according to the present invention may simply include the above-described supply step.

  In the ice making process, the seawater may be subcooled and the subcooled seawater may be released. According to the present invention, seawater can be used to make sherbet ice of seawater. The seawater is preferably sterile seawater. Moreover, it is more preferable that seawater is the sterilizing seawater by which salt adjustment was carried out. Salt adjustment can be adjusted by mixing fresh water with seawater. The concentration of salted sterile water can be adjusted according to the aquatic product. The concentration of the salted sterilized seawater may be lower than the concentration of seawater (e.g. 3.5%), for example within 3%.

  ADVANTAGE OF THE INVENTION According to this invention, the diameter of an ice crystal grain is smaller than before, the ice crystal grain is equal, and the technique which ices the sherbet ice of the salt water which can not be easily enlarged can be provided.

FIG. 1 shows a block diagram of a sherbet ice ice making system according to an embodiment. The expanded sectional view of the ice storage tank which concerns on embodiment is shown. Fig. 6 shows an operation flow of the ice making system for the sherbet ice according to the embodiment. The block diagram of the ice making system of the sherbet ice which concerns on a modification is shown. The taken image (magnification 500 times) of the sherbet ice manufactured by the ice making system of the sherbet ice which concerns on embodiment is shown. The taken image (magnification 150x) of the sherbet ice manufactured by the ice making system of the sherbet ice which concerns on embodiment is shown. The taken image (magnification 500x) of the sherbet ice made ice supposing the conventional scraping type ice making method is shown. The enlarged view of the right figure of FIG. 7 is shown.

  Next, an embodiment of the present invention will be described based on the drawings. In the following description, the case where sherbet ice made by the ice making system 1 for sherbet ice according to the embodiment is used to maintain the freshness of marine products and the like will be described as an example. The marine products are exemplified by fish (eg, saury, tuna, horse mackerel, mackerel, etc.) and crustaceans (eg, crab, shrimp). These are examples, and aquatic products are not limited to these. Also, the embodiments described below are merely examples, and the present invention is not limited to the embodiments described below.

<Sherbet Ice Ice Making System>
The ice making system 1 of the sherbet ice according to the embodiment brings the seawater into a supercooled state, releases the supercooled seawater, and the diameter of the ice crystal grains is 0.01 to 0.1 mm (in the present embodiment, 0.05 mm). The ice ice making apparatus 2 for making ice and the sherbet ice made by the ice making apparatus 2 are stored, and the diameter of the ice grains is 0.01 to 0.1 mm ( In this embodiment, a supply device 3 for supplying sherbet ice having a large amount of ice crystal grains of about 0.05 mm) and a control device 5 for controlling the ice making device 2 and the supply device 3 are provided. The ice making system 1 of the sherbet ice according to the embodiment may further include a refrigerator 4. The diameter of the ice crystal grains means the maximum diameter when the ice crystal grains are other than spherical (for example, an ellipsoid).

  The ice making apparatus 2 mainly includes a forward pipe 21, a return pipe 22, a pump 23 of the ice making apparatus, a preheater 24, a filter 25 of the ice making apparatus, a heat exchanger 26, and a releaser 27. The supply apparatus 3 mainly includes a water supply pipe 31, a supply pipe 32 (a first supply pipe 321, a second supply pipe 322), an ice storage tank 33, and a pump 34 of the supply apparatus. Each of the above configurations will be described below along the flow of seawater supply, subcooling, release, and supply of sherbet ice.

<< Water supply piping >>
One end of the water supply pipe 31 is connected to the seawater processing apparatus 6, the other end is connected to the upper portion of the ice storage tank 33, and seawater flows. The seawater processing apparatus 6 mixes the sterilized seawater and fresh water, and produces | generates the sterilization seawater of 0 to 3% of salt concentration. The seawater processing apparatus 6 can use the existing equipment installed in a fishing port or the like. The seawater processing apparatus 6 can be configured to include, for example, a salt concentration adjustment tank, a salt concentration setting device, a fresh water amount adjustment valve, a pump for seawater supply, and a solid-liquid separation filter. The salt water adjusting tank is filled with the sterilized seawater, the fresh water adjusting valve is opened based on the salt concentration (0 to 3%) set by the salt concentration setting device, and a predetermined amount of fresh water is introduced. As a result, sterilized seawater having a salt concentration of 3% or less lower than the seawater concentration (for example, 3.5%) is generated.

  In the feed water pipe 31, an automatic valve 35 of the seawater supply device and a filter 36 of the seawater supply device are provided sequentially from the upstream side in the flow of seawater. The automatic valve 35 of the seawater supply device is controlled by the control device 5 and is opened when the water level of the ice storage tank 33 drops when the ice storage tank 33 is filled with seawater, and is closed when the water level rises. The water level of the ice storage tank 33 can be acquired by a water level gauge provided in the ice storage tank 33 described later. The filter 36 of the seawater supply apparatus is, for example, a filter with a filtration diameter of 20 μm, and captures impurities contained in seawater. Impurities are solids that can be harmful in ice making, in other words, can be a trigger to release the supercooled seawater. Examples of impurities include small pieces of seaweed and sand.

<< Ice storage tank >>
The ice storage tank 33 receives seawater and stores ice made sherbet ice. Here, FIG. 2 shows an enlarged sectional view of the ice storage tank according to the embodiment. The ice storage tank 33 includes a housing 331, a shaft 332, a wing 333, a motor 334, a punching plate 335, a seawater inlet 336, a seawater outlet 337, an ice inlet 338, an ice outlet 339, an outlet 340, and a water level gauge 341. Including. The shaft 332, the wing 333, and the motor 334 constitute the stirring unit of the present invention. The housing 331 has a cylindrical side wall 342, a circular lid 343 and a bottom 344 and stores sherbet ice together with seawater therein. The shaft 332 extends vertically downward from the lid 343 to a height not in contact with the punching plate 335. The shaft 332 is provided at a position eccentric to the center of the housing 331 in order to improve the stirring performance. Wings 333 stir the sherbet ice. The wing 333 is composed of a pair of left and right wings centered on the shaft 332, and is provided in two places at the top and bottom. The lower wing 333 is provided in the vicinity of the punching plate 335. Here, the seawater in the ice storage tank 33 is pumped up by the pump 23 of the ice making device, and in the vicinity of the punching plate 335, a suction force which is vertically downward acts. Therefore, sherbet ice tends to be deposited in the vicinity of the punching plate 335, and there is a concern that sufficient stirring can not be performed if the distance between the lower end of the lower wing 333 and the punching plate 335 is large. In the present embodiment, the sherbet ice can be sufficiently stirred by providing the lower wing 333 in the vicinity of the punching plate 335. The upper wing 333 is provided near the middle of the lower wing 333 and the lid 343. In addition, the shape of the wing | blade 333, a magnitude | size, the number of installation, etc. are not limited above. The motor 334 is provided on the lid 343 and rotates the shaft 332. The motor 334 is controlled by the control device 5 to be ON / OFF and the rotational speed.

The punching plate 335 corresponds to the partition portion of the present invention, and accommodates the sherbet ice of the ice storage tank 33 in the region on the ice delivery port 339 side, and allows the seawater to pass through the plurality of holes formed in the punching plate 335 . The punching plate 335 is a circle having substantially the same size as the inner diameter of the housing 331, the diameter of the hole is 0.8 mm, and the aperture ratio is 24%. In addition, the diameter and aperture ratio of the said hole are an example, for example, the diameter of a hole can be 0.3-2.0 mm and an aperture ratio can be 20 to 30%. The punching plate 335 is provided near the upper side of the seawater delivery port 337 provided near the bottom 344. The position of the punching plate 335 is not limited to the above, but in order to secure 50 to 60% of the IPF in the ice storage tank 33, the position is preferably below the center of the ice storage tank 33 in the vertical direction. It is preferable to be above the seawater delivery port 337 provided in the vicinity of 344. Instead of the punching plate 335, a net-like structure (for example, a mesh) may be used. The network structure may be either planar or three-dimensional. Three-dimensional ones are exemplified by three-dimensional network structures (eg, sintered metal filter etc.). Also, the punching plate 335 and the net-like structure may be appropriately combined and disposed.

  The seawater receiving port 336 is provided in the lid 343 and connected to the water supply pipe 31 to receive seawater. The seawater inlet 336 may be provided on the side wall 342 of the ice storage tank 33. The seawater receiving port 336 may be provided above the water surface when the water storage tank 33 is full, and the installation position is not limited to the above. The seawater delivery port 337 is provided in the vicinity of the bottom 344 of the side wall 342 and connected to the forward piping 21 to deliver seawater. The ice receiving port 338 is provided near the lid 343 in the side wall 342 and connected to the return pipe 22 to receive the sherbet ice. The ice receiving port 338 can also be provided, for example, in the lid 343. The ice delivery port 339 is provided on the upper side near the punching plate 335, and is connected to the supply pipe 32 (second supply pipe 322) to deliver sherbet ice having a diameter of ice crystal grains of 0.01 to 0.1 mm. A plurality of ice delivery ports 339 may be provided as long as they are provided at least on the upper side near the punching plate 335. The discharge port 340 is provided at the bottom 344 and connected to the discharge pipe 37 to discharge the water in the ice storage tank 33 and the sherbet ice. The discharge pipe 37 is provided with an automatic valve 38 for discharge. The automatic valve 38 for discharging is controlled by the control device 5 and is opened before receiving seawater, drains water and sherbet ice in the ice storage tank 33 and drains all water and sherbet ice in the ice storage tank 33 Will be closed. The water level gauge 341 is provided in the ice storage tank 33, and measures the water level of the seawater in the ice storage tank 33. For the water level gauge 341, an existing sensor such as a water level sensor can be used as appropriate.

<< Pip piping >>
One end of the forward pipe 21 is connected to the seawater delivery port 337 of the ice storage tank 33, the other end is connected to the heat exchanger 26, and seawater cooled by the ice storage tank 33 flows. The forward pipe 21 is provided with a pump 23 of an ice making device, a preheater 24 and a filter 25 of the ice making device in this order from the upstream side in the flow of seawater. The ice making machine pump 23 pumps up seawater from the ice storage tank 33 and pumps it to the heat exchanger 26. The pump 23 of the ice making device includes a gate valve, and in order to make the flow rate of seawater supplied to the heat exchanger 26 constant, inverter control by the control device 5 is possible. The control device 5 stabilizes the flow rate of seawater supplied to the heat exchanger 26 based on the flow rate information of seawater acquired from the flowmeter M1 provided between the heat exchanger 26 and the pump 23 of the ice making apparatus. Adjust the opening of the gate valve and the pressure of the pump.

The preheater 24 melts fine ice contained in the seawater from the ice storage tank 33. The preheater 24 can be configured by a heater, and the ON / OFF and heating temperature are controlled by the controller 5. The control device 5 sets the temperature of the seawater supplied to the heat exchanger 26 to a predetermined temperature (for example, based on the temperature information of the seawater acquired from the temperature sensor T3 provided between the heat exchanger 26 and the preheater 24). , Controls the preheater 24 to be maintained at 0.degree. For example, the controller 5 raises the heating temperature of the preheater 24 when the temperature of seawater is lower than the predetermined temperature. Also, for example, when the temperature of seawater is higher than the predetermined temperature, the control device 5 lowers the heating temperature of the preheater 24. The predetermined temperature can be determined in advance by experiments or the like according to the concentration of seawater and the like. The filter 25 of the ice making apparatus captures impurities contained in condensed ice and seawater. Examples of impurities include small pieces of seaweed, sand, and fine ice particles.

  The heat exchanger 26 is connected to the forward pipe 21 connected to the ice storage tank 33 and the return pipe 22 connected to the releaser 27, and further connected to the brine forward pipe 42 and the brine return pipe 43 connected to the refrigerator 4. Heat exchange is performed between brine and seawater as a supercooling medium supplied from the refrigerator 4 to bring the seawater into a supercooled state. The heat exchanger 26 is configured of a plate type heat exchanger. The heat exchanger 26 can use various existing heat exchangers, such as a shell and tube type heat exchanger.

<< Freezer >>
The refrigerator 4 cools the brine. The temperature of the brine is, for example, -6 ° C before heat exchange and -3 ° C after heat exchange. The refrigerator 4 is controlled by the controller 5. The control device 5 adjusts ON / OFF and the cooling temperature based on the flow rate information of the brine detected by the flow meter M2 described later, the temperature of the brine detected by the temperature sensors T1 and T2 described later, and the like. One end of the brine forward pipe 42 is connected to the refrigerator 4 and the other end is connected to the heat exchanger 26, cooled by the refrigerator 4, and the brine before heat exchange flows. A brine pump 41, a flow meter M2, and a temperature sensor T1 are provided in the brine forward pipe 42 sequentially from the upstream side in the flow of the brine. The brine pump 41 pumps the brine cooled by the refrigerator 4 to the heat exchanger 26. The brine pump 41 includes a gate valve, and the flow rate of brine can be controlled by the controller 5. The flow meter M2 detects the flow rate of the brine flowing through the forward pipe 42 of the brine. The temperature sensor T1 detects the temperature of the brine flowing through the forward pipe 42 of the brine.

  One end of the brine return pipe 43 is connected to the heat exchanger 26, the other end is connected to the refrigerator 4, and the heat-exchanged brine flows. The brine return pipe 43 is provided with a temperature sensor T2. The temperature sensor T2 detects the temperature of the brine flowing through the brine return pipe 43. The IPF is calculated based on the flow rate of the brine detected by the flow meter M1, the temperature sensors T1 and T2, and the temperature of the brine.

<< Canceler >>
One end of the return pipe 22 is connected to the heat exchanger 26, the other end is connected to the releaser 27, and seawater in a supercooled state flows. The releaser 27 releases the supercooling state by ultrasonic waves. The releaser 27 is not limited to the above as long as it can release the subcooling state.

<< Supply piping >>
The supply pipe 32 is configured of a first supply pipe 321 and a second supply pipe 322. One end of the first supply pipe 321 is connected to the releaser 27, the other end is connected to the ice storage tank 33, and the sherbet ice released by the releaser 27 flows. One end of the second supply pipe 322 is connected to the ice storage tank 33, and the other end is connected to the supply destination, so that 50% to 60% of IPF sherbet ice stored in the ice storage tank 33 flows. The supply destination of the present embodiment is a water tank provided on a ship for maintaining the freshness of the water product. The supply destination is not limited to the above as long as it is a place required to keep the aquatic product fresh. The second supply pipe 322 is provided with a pump 34 of the ice supply device and an automatic valve 39 of the ice supply device sequentially from the upstream side in the flow of sherbet ice.

The ice supply pump 34 pumps the sherbet ice from the ice storage tank 33 and pumps it to the supply destination. The ice supply pump 34 includes a gate valve, which can be controlled by the controller 5. The controller 5 adjusts the opening degree of the gate valve and the pressure of the pump. Ice supply device automatic valve 39
Is controlled by the control device 5, and when the ice storage tank 33 is filled with the sherbet ice, when it becomes the supply start instruction (switch ON), it is opened and the sherbet ice disappears or the supply stop instruction (switch OFF) It becomes a closed state when it becomes.

  The control device 5 controls various devices and equipment of the ice making system of sherbet ice. The control device 5 includes a CPU (central processing unit), a memory, an operation unit, a display unit, and the like, and controls various devices and devices by the CPU executing a control program stored in the memory. The controller 5 can be configured by a programmable logic controller (PLC) as an example.

<Operation>
Next, the operation of the ice making system 1 for the sherbet ice according to the embodiment will be described together with the control processing by the control device 5. FIG. 3 shows an operation flow of the sherbet ice ice making system according to the embodiment.

<< Seawater filling >>
In step S01, the ice storage tank 33 is filled with seawater. The control device 5 opens the automatic valve 38 for discharging, and discharges residual seawater in the ice storage tank 33. As a result, it is possible to suppress the increase in salt concentration of seawater, which is concerned by repeatedly performing ice making. The control device 5 acquires water level information from the water level gauge 341 of the ice storage tank 33, and closes the automatic valve 38 for discharge when the water level in the ice storage tank 33 falls below the predetermined water level (empty state). . Next, the control device 5 opens the automatic valve 35 of the seawater supply device. The seawater to the ice storage tank 33 can be pumped by a pump of a seawater processing apparatus provided on the seawater processing apparatus 6 side. Thereby, sterilized seawater (for example, 20 degreeC) of 0 to 3% of salt concentration is pumped. The seawater passes through the filter 36 of the seawater supply device to capture impurities (for example, small pieces of seaweed or sand) contained in the seawater. The control device 5 acquires water level information from the water level gauge 341 of the ice storage tank 33, and when the water level of the ice storage tank 33 rises to a predetermined water level or more, the automatic valve 38 for discharge is closed. The salt concentration in the ice storage tank 33 may be acquired, and in this case, the control device 5 may turn on the motor 334 to rotate the wing 333 and stir the seawater.

<< Ice making >>
In step S02, sherbet ice is produced. The control device 5 turns on the pump 23 of the ice making device, pumps up the seawater in the ice storage tank 33, and pumps it to the heat exchanger 26. The control device 5 stabilizes the flow rate of seawater supplied to the heat exchanger 26 based on the flow rate information of seawater acquired from the flow meter M1 in order to stabilize the flow rate of seawater supplied to the heat exchanger 26. The inverter control of the pump 23 of the ice making apparatus is performed. In addition, the control device 5 controls the preheater 24 so that the temperature of the seawater supplied to the heat exchanger 26 is maintained at a predetermined temperature (for example, 0 degrees) based on the temperature information of the seawater acquired from the temperature sensor T3. Control. The controller 5 raises the heating temperature of the preheater 24 when the temperature of the seawater is lower than the predetermined temperature. Also, for example, when the temperature of seawater is higher than the predetermined temperature, the control device 5 lowers the heating temperature of the preheater 24. The seawater passes through the filter 25 of the ice making device, and the impurities contained in the condensed ice and seawater are captured. Examples of impurities include small pieces of seaweed, sand, and fine ice particles.

  The seawater passing through the filter 25 of the ice making device is heat-exchanged with the brine supplied from the refrigerator 4 by the heat exchanger 26, and is cooled to a subcooling state of about 2 deg. For example, the seawater is cooled by the heat exchanger 26 to −2.5 ° C. to −5 ° C. The supercooled state is released from the supercooled state by the ultrasonic waves of the releaser 27. The control device 5 can also turn on / off the refrigerator 4 and the releaser 27.

The sherbet ice manufactured by releasing the supercooling state flows through the first supply pipe 321 and is pressure-fed to the ice storage tank 33. The control device 5 calculates the IPF in the ice storage tank 33 from the amount of heat produced by the refrigerator 4 and turns the motor 334 ON to rotate the wing 333 according to the IPF. The IPF can be calculated by the following equation 1, equation 2, and equation 3. The calculation of the IPF is started, for example, when the temperature of the seawater sent out from the ice storage tank 33 reaches a predetermined temperature (0 ° C.). First, the accumulated heat generation amount is calculated by Equation 1. In Equation 1, the flow rate is obtained by the flow meter M1 provided in the forward pipe 42 of the brine. Tbr-out is acquired by the temperature sensor T2 provided in the return pipe 43 of the brine. Tbr-in is acquired by the temperature sensor T1 provided in the forward pipe 42 of the brine. Cp is a constant pressure specific heat of brine, ρ is a density of brine, and these are obtained as physical property values of brine. The SCP generation power is the work rate of the pump 23 of the ice making device, and t is time.
Integrated heat generation amount = flow rate × (Tbr−out−Tbr−in) × Cp × ρ × t−preheating amount−SCP generation power × t + previous integrated heat generation amount ·········

The preheating amount in equation 1 is calculated by equation 2. In Equation 2, TSC-in is acquired by the temperature sensor T3 provided on the downstream side (the heat exchanger 26 side) of the forward piping 21, and Ttank-out is the upstream side (the ice storage tank 33 side) of the forward piping 21. It is acquired by temperature sensor T4 provided in. Cpw is a constant pressure specific heat of water, ρw is a density of water, and these are obtained as physical property values of water.
Preheating amount = supercooling water flow rate × (TSC−in−Ttank−out) × Cpw × ρw × t formula 2

The IPF is calculated based on the integrated heat generation amount calculated from the equation 1 and the equation 2. In Equation 3, the amount of water in the tank is the amount of water in the ice storage tank 33, ρw is the constant pressure specific heat of water, and L is the latent heat of solidification of water (the amount of heat required for all the water in the ice storage tank 33 to be ice).
IPF = integrated heat generation amount / (tank water amount × ρw × L) formula 3

  When the calculated IPF reaches a predetermined value (for example, 50%), the control device 5 ends the ice making. Specifically, the control device 5 turns off the pump 23, the refrigerator 4, and the releaser 27 of the ice making device, and ends the ice making.

<< Supply >>
In step S03, sherbet ice is supplied. The control device 5 opens the automatic valve 39 of the ice supply device when it receives a supply start instruction (for example, the switch ON provided in the operation unit of the control device 5) in a state where the ice storage tank 33 is filled with sherbet ice. To be in the state. As a result, sherbet ice having an IPF of 50 to 60% and a diameter of ice crystal grains of 0.01 to 0.1 mm flows through the second supply pipe 322 and is pumped to the supply destination. Further, the control device 5 acquires the water level information from the water level gauge 341, and instructs the supply stop instruction (for example, to the operation unit of the control device) whether the water level of the seawater in the ice storage tank 33 becomes lower than the predetermined water level (empty state). When the switch OFF is provided, the automatic valve 39 of the ice supply device is closed. This completes the supply of sherbet ice having a diameter of ice grains of 0.01 to 0.1 mm. When the process of step S03 is completed, the process of step S01 is started again.

<Effect>
According to the ice making system 1 of the sherbet ice according to the embodiment described above, the diameter of the ice crystal grains of the sherbet ice to be ice-made becomes 0.01 to 0.1 mm by supercooling and releasing the seawater. The diameter of ice crystal grains can be made smaller than before. In addition, the surface of the ice crystal grains is a curved surface, the grains are uniform, and the ice crystal grains are hardly coagulated with each other, so that the sherbet ice made by the ice making system 1 of the sherbet ice according to the embodiment is unlikely to be enlarged. As a result, the sherbet ice has better fluidity than before. Therefore, clogging of piping and the like is unlikely to occur, and sherbet ice can be supplied with power smaller than that of the prior art. Further, the pump 34 of the supply device does not have to be a dedicated pump for pumping the slurry liquid, and a general-purpose pump for pumping water can be used. Moreover, according to the ice making system 1 of the sherbet ice which concerns on embodiment, the value of IPF can be made larger than before. Specifically, in the technology of scraping off the ice making layer generated on the inner wall surface of the conventional cooler with a scraper, the IPF is 25 to 30%, but in the ice making system 1 for sherbet ice according to the embodiment, the IPF 50 to 60% It can be done. Therefore, the ice storage tank 33 can be miniaturized as compared with the conventional case. Alternatively, more sherbet ice can be stored than before.

  Moreover, according to the ice making system 1 of the sherbet ice which concerns on embodiment, the sherbet ice of salt concentration lower than before can be ice-made. Specifically, in the technology of scraping off the ice making layer generated on the inner wall surface of the conventional cooler with a scraper, the corresponding salt concentration is 1.0 to 3.5% (3.5% corresponds to the seawater salt concentration) there were. On the other hand, in the ice making system 1 for sherbet ice according to the embodiment, ice making of sherbet ice having a salt concentration of less than 1% is also possible, and sherbet ice having any salt concentration can be made. In addition, in the technology of peeling the ice making layer formed on the inner wall surface of the conventional cooler with a scraper, failure of the ice generator is likely to occur, which is considered to be a load at peeling, such as breakage of the scraper blade. Was concerned. In addition, maintenance was also a burden. On the other hand, in the ice making system 1 for the sherbet ice according to the embodiment, since there is no load at the time of peeling, there is little failure of the system and maintenance is easy. Furthermore, by using the sherbet ice made by the ice making system 1 for the sherbet ice according to the embodiment for maintaining the freshness of the water product etc., the quality of the water product etc. can be maintained longer than before.

  Further, according to the ice storage tank 33 according to the embodiment, the ice plate is also contained in the stirring portion (shaft 332, shaft 333) by storing the sherbet ice in the area on the stirring unit (shaft 332, wing 333, motor 334) side by the punching plate 335. It can be accommodated in the region on the wing 333 and the motor 334) side. As a result, it is possible to suppress ice particles from flowing into the ice making system 1, and it is possible to suppress the occurrence of freezing in the heat exchanger 26 and clogging in the pipe (for example, the forward pipe 21). Therefore, stable ice making can be performed. Moreover, according to the ice storage tank 33 which concerns on embodiment, since it can suppress that an ice particle flows in into the ice making system 1, it can stir also in ice making, and the stable ice making as mentioned above It can be performed. As a result, the efficiency of ice making can be improved. Moreover, when stopping stirring in ice making and starting stirring when supplying sherbet ice, it was feared that the load at the start of stirring is large. On the other hand, according to the ice storage tank 33 which concerns on embodiment, load does not become large at the time of stirring start. Further, in the prior art, in order to avoid an increase in load at the start of stirring, it was necessary to suppress the value of IPF at the time of ice storage to about 30%. On the other hand, in the ice making system 1 for sherbet ice according to the present embodiment, the IPF can be made 50 to 60%. Therefore, the ice storage tank can be miniaturized as compared with the conventional case. Alternatively, more sherbet ice can be stored than before.

<Modification>
FIG. 4 shows a block diagram of a sherbet ice ice making system according to a variant. Piping freezing and blocking may occur around the heat exchanger 26. Therefore, the ice making system 1 of the sherbet ice according to the modification is further provided with a bypass pipe 61 near the heat exchanger 26, and detects the flow rate flowing through the return piping 22 and the flow rate flowing through the bypass piping 61. Perform freeze and block detection. And when freezing is detected, it heats with a heater, and when obstruction is detected, it water-flows. In addition, about the structure similar to embodiment, the same code | symbol is attached | subjected and description is omitted.

As shown in FIG. 4, in the vicinity of the heat exchanger 26, the bypass pipe 61 is a forward pipe 21.
And the return pipe 22 are provided. In addition, a flow meter M3 is provided in the bypass pipe 61. Furthermore, a heater 45 is provided in the forward pipe 42 of the brine.

  The control device 5 acquires the subcooling water main flow rate G1 from the flow meter M1 in the vicinity of the heat exchanger 26 of the return pipe 22, and acquires the bypass flow rate G2 from the flow meter M3 of the bypass pipe 61. The control device 5 detects that freezing has occurred when the subcooling water main flow G1 <rated 90% and G2> rated 120%. In this case, the control device 5 turns off the refrigerator 23 and the pump 23 of the ice making device, turns on the heater 45, causes the brine heated by the heater 45 to flow through the heat exchanger 26, and melts the freezing portion . Further, the control device 5 detects that the blockage has occurred when the subcooling water main flow rate G1 <rated 100% and G2 <rated 90%. In this case, the control device 5 turns off the refrigerator 4 and allows the supercooled water to flow to flush the blockage.

  According to the ice making system 1 of sherbet ice according to the modification, it is possible to detect freezing or blockage of piping around the heat exchanger 26. Also, even if freezing or blockage is detected, freezing or blockage can be resolved.

<Example>
The confirmation test of the sherbet ice manufactured by the ice making system 1 of the sherbet ice which concerns on embodiment is demonstrated. In the confirmation test, after cooling the salt water having a salt concentration of 2.5% with a degree of supercooling 2 K, the sherbet ice formed by releasing was observed with a microscope and photographed, and the diameter of ice crystal grains was measured from the photographed image. In addition, as a comparative example, the sherbet ice made by making ice by assuming a conventional scraping type ice making method was photographed. Specifically, fresh water was poured on a cooled metal plate, the ice generated was scraped off with a blade, and it was introduced into salt water to make a sherbet shape, which was observed and photographed with a microscope. In the present comparative example, fresh water was applied to the cooled metal plate to produce ice, but ice produced by applying fresh water and ice produced by applying salt water in principle have only fresh water components. There is no change in becoming ice, and it can be considered that it can be regarded as the same condition.

  Here, FIG. 5 shows a photographed image (magnification 500 ×) of the sherbet ice manufactured by the ice making system 1 for the sherbet ice according to the embodiment. FIG. 6 shows a photographed image (150 × magnification) of the sherbet ice manufactured by the ice making system 1 for the sherbet ice according to the embodiment. On the other hand, FIG. 7 shows a photographed image (magnification of 500 times) of sherbet ice that has been ice-formed assuming a conventional scraping-type ice making method. The left side of FIG. 7 shows immediately after scraping, and the right side of FIG. 7 shows 10 minutes after scraping and stirring. 8 shows an enlarged view of the right view of FIG.

  As shown in FIG. 5, according to the ice making system 1 of the sherbet ice according to the embodiment, the ice is made of the sherbet ice whose surface is curved and the diameter of the ice crystal grains is 0.01 to 0.1 mm. Was confirmed. Moreover, as shown in FIG. 6, according to the ice making system 1 of the sherbet ice which concerns on embodiment, it was confirmed that the ice crystal grain of diameter 0.01-0.1 mm is disperse | distributing uniformly. On the other hand, in the comparative example, as shown in the left figure of FIG. 7, the ice crystal grains of the sherbet ice made by supposing the conventional scraping type ice making method have a diameter of 0.1 to 0.2 mm, It was confirmed that the crystal grains were dispersed nonuniformly. Further, as shown in the right side of FIG. 7 and FIG. 8, the ice crystal grains of the sherbet ice made by supposing the conventional scraping type ice making method tend to be bonded to each other, and the adjacent ice crystal grains are easily enlarged. It was confirmed that it was easy. From the above, the ice crystal grains of the sherbet ice made by the ice making system 1 of the sherbet ice according to the embodiment are compared with the ice crystal grains of the sherbet ice made by supposing the conventional scraping type ice making method. It was confirmed that the diameter was small, the grains were uniform, and the curved surface was even and smooth. It is considered that the small diameter, uniform grains, and even and smooth surface curved surface are the factors that make it difficult for the ice crystal grains to condense and make it difficult to enlarge them.

The various contents described above can be combined as much as possible without departing from the technical concept of the present invention. For example, although the example which performs a supply process after completion of an ice-making process was explained in the above-mentioned embodiment, it may be made to perform a supply process while performing an ice-making process. The variation of driving increases and convenience improves. Further, for example, in the above embodiment, the case where ice sorbet ice is produced from seawater and used for maintaining freshness of aquatic products etc was described as an example, but ice sorbet ice is produced from fresh water and used for maintaining freshness of vegetables etc. It is also good.

DESCRIPTION OF SYMBOLS 1 ... Ice-making system 2 ... Ice-making apparatus 26 ... Heat exchanger 27 ... Releaser 3 ... Supply apparatus 33 ... Ice storage tank 335 ... Punching board 4 ... Refrigerator 5 ... Control device 6 ... Sea water treatment device

Claims (3)

An ice storage tank for storing sherbet ice made by releasing supercooled water containing salt water and / or fresh water, comprising:
A stirrer for stirring the sherbet ice;
A partition part which accommodates the sherbet ice in the area on the side of the stirring part and through which the water can pass;
An ice delivery port which is opened laterally at the upper side near the partition, and is connected to a pipe extending laterally from the ice storage tank and connected to the ice storage tank on the sherbet ice on the partition and provided in the pipe An ice delivery port for delivery out of the ice storage tank with a fixed pump ,
And a water outlet provided in an area opposite to the stirring portion with the partition portion as a boundary, for sending out the water.
The stirring unit stirs the sherbet ice with a blade that rotates about an axis provided at a position eccentric to the center of the housing of the ice storage tank .
The ice storage tank is cylindrical,
The partition portion is circular and is formed of a punching plate having an aperture ratio of 20 to 30%,
The stirring unit stirs the sherbet ice with a blade that rotates in the vicinity of the partition unit and in the vicinity of the ice delivery port, with an axis provided at a position eccentric to a center of a cylinder forming the ice storage tank. ,
Ice storage tank. An ice making apparatus for supercooling water containing at least one of brine and fresh water, releasing the supercooled water, and producing sherbet ice having a diameter of ice crystal grains of 0.01 to 0.1 mm. When,
And a supply device for storing ice sherbet ice made by the ice making device in the ice storage tank according to claim 1 and supplying sherbet ice having a diameter of ice crystal grains of 0.01 to 0.1 mm.
Sherbet ice ice making system. A preheater for preheating water sent from the water outlet of the ice storage tank to the ice making device;
And a filter for removing impurities from water sent from the water delivery port of the ice storage tank to the ice making device.
A sherbet ice ice making system according to claim 2 .