JP6383037B2 - Sherbet ice making system and method - Google Patents

Description

  The present invention relates to an ice making system and an ice making method.

  There is a technology to make sherbet ice used to maintain the freshness of marine products. For example, Patent Document 1 discloses an ice generator that sends out salt water that flows in as ice, a small-capacity ice making tank for making sherbet ice having a constant sherbet concentration, and a constant ice produced by an ice making tank and an ice generator. A storage tank having a larger capacity than the ice making tank for storing sherbet ice having a sherbet concentration, and sherbet ice is made by a storage tank that stores sherbet ice having a constant sherbet concentration so that it can be always provided from the beginning of storage. A method is disclosed. For example, Patent Document 2 discloses a technique for storing ice / slurry made by a supercooler in an ice heat storage tank.

Japanese Patent No. 5325510 JP 2009-168369 A

  As a technology to make sherbet ice used to maintain the freshness of marine products, etc., the salt water supplied into the cooler is cooled by a coolant, and the ice making layer formed on the inner wall surface of the cooler is peeled off by a scraper. There is an ice generator to be generated (for example, Patent Document 1). However, in this conventional ice generator, ice is generated by peeling off the ice making layer generated on the inner wall surface of the cooler with a scraper. Therefore, the sherbet ice to be made has an ice crystal grain diameter of about 0.2 mm. Met. Moreover, since the ice making layer was peeled off with a scraper, the shape of the ice crystal grains was likely to vary. In addition, the ice crystal grains were easy to condense and were easy to enlarge. On the other hand, the sherbet ice used for maintaining the freshness of marine products and the like preferably has small diameters of ice crystal grains, uniform ice crystal grains, and is more difficult to enlarge.

  In view of the above problems, an object of the present invention is to provide a technique for making salty sherbet ice, which has a diameter of ice crystal grains smaller than that of conventional ones, has a uniform ice crystal grain size, and is difficult to enlarge.

  In order to solve the above-described problems, the present invention applies salt-water sherbet ice by applying the supercooling ice making technology cultivated by the applicant for many years with ice heat storage for air conditioning.

  More specifically, the present invention relates to an ice making device for making salt water in a supercooled state, releasing the supercooled salt water, and making sherbet ice having an ice crystal grain diameter of 0.01 to 0.1 mm, and the ice making device. A sherbet ice making system comprising: a supply device that stores the sherbet ice produced in step 1 and supplies sherbet ice having an ice crystal grain diameter 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 to be made by supercooling and releasing the salt water is 0.01 to 0.1 mm. The diameter 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. Further, the sherbet ice produced by the ice making system of the sherbet ice according to the present invention has a curved surface of the ice crystal grains, the grains are aligned, and the ice crystal grains are difficult to condense. As a result, the fluidity of sherbet ice is superior to the conventional one. Therefore, clogging of pipes and the like is hardly generated, and sherbet ice can be supplied with less power than conventional. Further, according to the ice making system for sherbet ice according to the present invention, the value of ice filling factor (IPF: Ice Packing Factor) at the time of ice storage can be made larger than before. Specifically, in the technology of peeling 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 sherbet ice making system according to the present invention, the IPF is 50 to 60%. can do. Therefore, the ice storage tank can be made smaller than before. Further, according to the ice making system for sherbet ice according to the present invention, sherbet ice having a lower salinity than that in the past can be made. Specifically, in the technology of peeling off the ice making layer generated on the inner wall surface of the conventional cooler with a scraper, the corresponding salinity concentration is 1.0 to 3.5% (3.5% corresponds to the seawater salinity concentration). there were. On the other hand, in the ice making system for sherbet ice according to the present invention, ice making of sherbet ice having a salt concentration of less than 1% is possible, and sherbet ice having an arbitrary salt concentration can be made. In addition, the conventional technology that peels off the ice-making layer generated on the inner wall of the cooler with a scraper is likely to cause a failure of the ice generator, which may be caused by the load at the time of peeling, such as the blade of the scraper being damaged. There was concern. In addition, the maintenance work has become a burden. On the other hand, in the sherbet 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 produced by the ice making system of the sherbet ice according to the present invention for maintaining the freshness of the fishery product, the quality of the fishery product can be maintained longer than before.

  The sherbet ice can be suitably used for marine products that need to be kept fresh with salt water. Examples of marine products include fish (eg, saury, tuna, horse mackerel, mackerel) and crustaceans (eg, crab, shrimp). These are examples, and marine products are not limited to these.

  Here, the ice making device may bring the seawater into a supercooled state and release the supercooled seawater. According to the present invention, seawater sherbet ice can be made using seawater. The seawater is preferably sterilized seawater. Moreover, it is more preferable that the seawater is sterilized seawater whose salt content is adjusted. Salinity adjustment can be adjusted by mixing fresh water with seawater. The concentration of the sterilized seawater adjusted for salinity can be adjusted according to the marine product. The concentration of the salt-adjusted sterilized seawater can be lower than the seawater concentration (for example, 3.5%), for example, 3% or less.

  In addition, the ice making device is connected to an outgoing pipe through which salt water flows, a heat exchanger connected to the outgoing pipe to bring the salt water into a supercooled state, a return pipe through which the supercooled salt water flows, and the return pipe And a release device for releasing the supercooled salt water, wherein the supply device stores an ice storage tank for storing the sherbet ice made by the ice making device, and a pump for pumping the stored sherbet ice. And a supply pipe connected to the ice storage tank and the pump and through which the sherbet ice flows.

  The forward piping can have one end connected to the ice storage tank and the other end connected to the heat exchanger. The salt water from the ice storage tank can flow to the outgoing piping. The salt water from the ice storage tank is obtained by lowering the temperature of the raw water by the ice storage tank. For the outgoing piping, the pump of the ice making device that pumps salt water in the ice storage tank and pumps it to the heat exchanger, the preheater that melts the fine ice contained in the salt water from the ice storage tank, various valves, thermometer, flow meter, etc. At least one of them may be further provided. The supercooling water pump may be inverter-controlled in order to make the flow rate supplied to the heat exchanger constant.

The heat exchanger exchanges heat between the supercooling medium (water, brine, etc.) supplied from the refrigerator and the salt water, thereby bringing the salt water into a supercooled state. Various heat exchangers including a plate type and a shell and tube type can be used as the heat exchanger. The canceller cancels the supercooled state by, for example, ultrasonic waves. The releaser is not limited to the above as long as it can release the supercooled state. The return pipe can have one end connected to the heat exchanger and the other end connected to the releaser. The return pipe may be further provided with at least one of various valves, thermometers, flow meters, and the like.

  The ice storage tank stores ice-made sherbet ice, and can have a stirring portion. By having the stirring unit, the ice storage tank can suppress the condensation of ice contained in the sherbet ice and maintain the fluidity of the sherbet ice. In the ice making system for sherbet ice according to the present invention, the IPF of the ice storage tank can be 50 to 60%. The stirring unit may include a shaft, a wing connected to the shaft, and a motor that rotates the shaft. The ice storage tank includes a raw water inlet for receiving salt water (raw water), a raw water outlet for sending raw water, an ice inlet for receiving sherbet ice, an ice outlet for sending sherbet ice, and an ice outlet for discharging the remaining sherbet ice. It can be. In addition, the ice storage tank accommodates the sherbet ice in the tank in the area on the ice delivery outlet side and allows a partition through which salt water can pass (for example, a plate-like object having a plurality of holes, a net-like object, these A combination). By having a partition part, an ice storage tank can suppress that ice is mixed in the salt water sent to a supercooler.

  The pump pumps the stored sherbet ice. Since the sherbet ice produced by the ice making system of the sherbet ice according to the present invention is excellent in fluidity, the pump according to the present invention can supply the sherbet ice with a smaller power than conventional. Moreover, 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. One end of the supply pipe is connected to the release device, the other end is connected to the supply destination, and an ice storage tank or pump can be provided in the middle of the pipe. The supply pipe includes a first supply pipe having one end connected to the release unit and the other end connected to the ice storage tank, and a second supply pipe having one end connected to the water storage tank and the other end connected to the supply destination. But you can. You may make it provide at least any one among various valves, a thermometer, a flow meter, etc. in supply piping.

  The ice making system for sherbet ice according to the present invention includes an ice making device, a supply device, a heat exchanger and a release device constituting the ice making device, an ice storage tank and a pump constituting the supply device, and a control unit for controlling various valves. It is good also as composition provided further.

  In addition, this invention can also be specified as an ice making apparatus mentioned above. Moreover, this invention can also be specified as a supply apparatus mentioned above.

  Here, this invention can also be specified as an ice making method of sherbet ice. For example, the present invention provides an ice making process in which salt water is supercooled, the supercooled salt water is released, and sherbet ice having an ice crystal grain diameter of 0.01 to 0.1 mm is made. And a supply step of supplying sherbet ice having ice crystal grains having a diameter of 0.01 to 0.1 mm.

According to the ice making method for sherbet ice according to the present invention, the diameter of ice crystal grains can be made smaller than before. Further, the sherbet ice produced by the ice making method of the sherbet ice according to the present invention has the same shape and size of the ice crystal grains, and the ice crystal grains are difficult to condense, so that they are not easily enlarged. As a result, the fluidity of the sherbet ice is superior to that of the prior art, the clogging of the piping and the like is less likely to occur, and the sherbet ice can be supplied with less power than the prior art. Moreover, the value of the ice filling rate (IPF) at the time of ice storage can be made larger than before. Further, sherbet ice having a lower salinity than conventional can be made. Further, 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 marine product, the quality of the marine product can be maintained longer than before. Note that the ice making method of the sherbet ice according to the present invention may simply include the ice making process described above. Moreover, the ice making method of the sherbet ice according to the present invention may simply include the above-described supplying step.

  In the ice making step, the seawater may be supercooled and the supercooled seawater may be released. According to the present invention, seawater sherbet ice can be made using seawater. The seawater is preferably sterilized seawater. Moreover, it is more preferable that the seawater is sterilized seawater whose salt content is adjusted. Salinity adjustment can be adjusted by mixing fresh water with seawater. The concentration of the sterilized seawater adjusted for salinity can be adjusted according to the marine product. The concentration of the sterilized seawater adjusted for salinity may be lower than the seawater concentration (for example, 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 has gathered, and the technique of making the salt water sherbet ice which is hard to enlarge can be provided.

1 is a block diagram of a sherbet ice making system according to an embodiment. FIG. The expanded sectional view of the ice storage tank concerning an embodiment is shown. The operation | movement flow of the ice making system of the sherbet ice which concerns on embodiment is shown. The block diagram of the ice making system of the sherbet ice which concerns on a modification is shown. The photographed image (500-times multiplication factor) of the sherbet ice made with the ice making system of the sherbet ice which concerns on embodiment is shown. The photographed image (150-times multiplication factor) of the sherbet ice made with the ice making system of the sherbet ice which concerns on embodiment is shown. A photographed image (magnification of 500 times) of sherbet ice made by assuming a conventional scraping-type ice making method is shown. The enlarged view of the right figure of FIG. 7 is shown.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description, the case where the sherbet ice produced by the ice making system 1 for sherbet ice according to the embodiment is used for maintaining the freshness of marine products will be described as an example. Examples of marine products include fish (eg, saury, tuna, horse mackerel, mackerel) and crustaceans (eg, crab, shrimp). These are examples, and marine products are not limited to these. Moreover, the embodiment described below is merely an example, and the present invention is not limited to the embodiment described below.

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

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

<< Water supply piping >>
One end of the water supply pipe 31 is connected to the seawater treatment device 6, and the other end is connected to the upper part of the ice storage tank 33 so that seawater flows. The seawater treatment device 6 mixes sterilized seawater and fresh water to produce sterilized seawater having a salt concentration of 0 to 3%. The seawater treatment apparatus 6 can use existing equipment installed in a fishing port or the like. As an example, the seawater treatment device 6 may include a salinity concentration adjustment tank, a salinity concentration setting device, a fresh water amount adjustment valve, a seawater supply pump, and a solid-liquid separation filter. Sterilized seawater is filled in the salinity adjustment tank, the fresh water adjustment valve is opened based on the salinity concentration (0 to 3%) set by the salinity concentration setter, and a predetermined amount of fresh water is introduced. As a result, sterilized seawater having a salt concentration of 3% or less, which is lower than the seawater concentration (for example, 3.5%), is generated.

  In addition, the water supply pipe 31 is provided with an automatic valve 35 of a seawater supply device and a filter 36 of the seawater supply device in order 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 when the ice storage tank 33 is filled with seawater, it opens when the water level of the ice storage tank 33 drops, and closes when the water level rises. The water level of the ice storage tank 33 can be acquired by a water level meter provided in the ice storage tank 33 described later. The filter 36 of the seawater supply device is constituted by a filter having a filtration diameter of 20 μm, for example, and captures impurities contained in the seawater. Impurities are solid substances that can be harmful in ice making, in other words, they can trigger a release of seawater that is in a supercooled state. Examples of the impurities include small pieces of seaweed and sand.

<< Ice storage tank >>
The ice storage tank 33 receives seawater and stores the sherbet ice that has been made. Here, FIG. 2 shows an enlarged cross-sectional view of the ice storage tank according to the embodiment. The ice storage tank 33 includes a housing 331, a shaft 332, a blade 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 axis | shaft 332, the wing | blade 333, and the motor 334 comprise the stirring part of this 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. The shaft 332 extends vertically downward from the lid portion 343 to a height at which it does not contact the punching plate 335. The shaft 332 is provided at a position eccentric from the center of the housing 331 in order to improve the stirring performance. The wing 333 agitates the sherbet ice. The wing 333 is composed of a pair of left and right wings around the shaft 332, and is provided at two locations on 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 a vertically downward suction force acts in the vicinity of the punching plate 335. Therefore, sherbet ice easily accumulates in the vicinity of the punching plate 335, and there is a concern that sufficient stirring cannot be achieved 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 between the lower wing 333 and the lid portion 343. Note that the shape, size, number of installations, and the like of the wings 333 are not limited to the above. The motor 334 is provided on the lid portion 343 and rotates the shaft 332. The motor 334 is ON / OFF controlled by the control device 5 and the rotation speed is controlled.

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

  The seawater receiving port 336 is provided in the lid portion 343 and is connected to the water supply pipe 31 to receive seawater. The seawater receiving port 336 may be provided on the side wall 342 of the ice storage tank 33. The seawater receiving port 336 only needs to 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 outlet 337 is provided in the vicinity of the bottom 344 of the side wall 342 and is connected to the forward piping 21 to send out seawater. The ice receiving port 338 is provided near the lid portion 343 on the side wall 342 and is connected to the return pipe 22 to receive the sherbet ice. The ice receiving port 338 can also be provided in the cover part 343, for example. The ice delivery port 339 is provided on the upper side in the vicinity of the punching plate 335 and connected to the supply pipe 32 (second supply pipe 322) to send out sherbet ice having ice crystal grains having a diameter of 0.01 to 0.1 mm. The ice delivery port 339 may be provided at least in the vicinity of the punching plate 335, and a plurality of ice delivery ports 339 may be provided. The discharge port 340 is provided at the bottom 344 and is connected to the discharge pipe 37 to discharge water and sherbet ice in the ice storage tank 33. 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. The water and the sherbet ice in the ice storage tank 33 are discharged, and all the water and the sherbet ice in the ice storage tank 33 are discharged. And the closed state. The water level meter 341 is provided in the ice storage tank 33 and measures the water level of seawater in the ice storage tank 33. An existing sensor such as a water level sensor can be used as the water level meter 341 as appropriate.

<< Outward piping >>
One end of the outgoing pipe 21 is connected to the seawater delivery port 337 of the ice storage tank 33 and the other end is connected to the heat exchanger 26, and the seawater cooled by the ice storage tank 33 flows. The outgoing pipe 21 is provided with an ice making device pump 23, a preheater 24, and an ice making device filter 25 in order from the upstream side in the flow of seawater. The pump 23 of the ice making device draws 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 makes the flow rate of seawater supplied to the heat exchanger 26 constant so that the inverter control by the control device 5 is possible. The control device 5 makes the flow rate of the seawater supplied to the heat exchanger 26 constant based on the flow rate information of the seawater acquired from the flow meter M1 provided between the heat exchanger 26 and the pump 23 of the ice making device. Adjust the opening of the gate valve and the pressure of the pump.

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

  The heat exchanger 26 is connected to an outgoing pipe 21 connected to the ice storage tank 33 and a return pipe 22 connected to the releaser 27, and further to a brine outgoing pipe 42 and a brine return pipe 43 connected to the refrigerator 4. The brine and seawater as the supercooling medium supplied from the refrigerator 4 are heat-exchanged to bring the seawater into a supercooled state. The heat exchanger 26 is configured by a plate heat exchanger. As the heat exchanger 26, various existing heat exchangers such as a shell-and-tube heat exchanger can be used.

<< Refrigerator >>
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 control device 5. The control device 5 adjusts the ON / OFF and cooling temperature based on the flow rate information of the brine detected by a flow meter M2 described later, the temperature of the brine detected by temperature sensors T1, T2 described later, and the like. One end of the brine outgoing pipe 42 is connected to the refrigerator 4, the other end is connected to the heat exchanger 26, is 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 outgoing pipe 42 in order from the upstream side in the brine flow. 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 the brine can be controlled by the control device 5. The flow meter M2 detects the flow rate of the brine flowing through the outgoing piping 42 for the brine. The temperature sensor T <b> 1 detects the temperature of the brine flowing through the brine outgoing pipe 42.

  The brine return pipe 43 has one end connected to the heat exchanger 26 and the other end connected to the refrigerator 4 so that the brine after heat exchange flows. The brine return pipe 43 is provided with a temperature sensor T2. The temperature sensor T <b> 2 detects the temperature of the brine flowing through the brine return pipe 43. The IPF is calculated based on the brine flow rate and the brine temperature detected by the flow meter M1 and the temperature sensors T1 and T2.

<< Release machine >>
One end of the return pipe 22 is connected to the heat exchanger 26, the other end is connected to the releaser 27, and supercooled seawater flows. The canceller 27 cancels the supercooled state using ultrasonic waves. The releaser 27 is not limited to the above as long as it can release the supercooled state.

<< Supply piping >>
The supply pipe 32 includes 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 sherbet ice released by the releaser 27 flows. One end of the second supply pipe 322 is connected to the ice storage tank 33, the other end is connected to the supply destination, and the IPF 50-60% sherbet ice stored in the ice storage tank 33 flows. The supply destination of this embodiment is a water tank provided in a ship for maintaining freshness of marine products. The supply destination is not limited to the above as long as it is a place required to keep the fishery 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 in order from the upstream side in the flow of the sherbet ice.

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

  The control device 5 controls various devices and devices of the sherbet ice making system. 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 control apparatus 5 can be comprised by PLC (programmable logic controller) as an example.

<Operation>
Next, the operation of the ice making system 1 for sherbet ice according to the embodiment will be described along with the control processing by the control device 5. FIG. 3 shows an operation flow of the ice making system for sherbet ice 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 the residual seawater from the ice storage tank 33. Thereby, it is possible to suppress an increase in the salt concentration of seawater, which is a concern due to repeated ice making. The control device 5 acquires the water level information from the water level gauge 341 of the ice storage tank 33, and when the seawater level in the ice storage tank 33 falls below a predetermined water level (empty state), the automatic valve 38 for discharging is closed. . Next, the control device 5 opens the automatic valve 35 of the seawater supply device. Seawater to the ice storage tank 33 can be pumped by a pump of the seawater treatment device provided on the seawater treatment device 6 side. Thereby, sterilized seawater (for example, 20 ° C.) having a salt concentration of 0 to 3% is pumped. The seawater passes through the filter 36 of the seawater supply device, so that impurities contained in the seawater (for example, seaweed small pieces and sand) are captured. The control device 5 acquires the water level information from the water level gauge 341 of the ice storage tank 33, and when the seawater level in the ice storage tank 33 rises to a predetermined water level or higher, the discharge automatic valve 38 is closed. Note that the salinity concentration in the ice storage tank 33 may be acquired. In this case, the control device 5 may turn on the motor 334 to rotate the wing 333 to stir the seawater.

<< ice making >>
In step S02, sherbet ice is made. 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. In order to stabilize the flow rate of the seawater supplied to the heat exchanger 26, the control device 5 stabilizes the flow rate of the seawater supplied to the heat exchanger 26 based on the flow rate information of the seawater acquired from the flow meter M1. Thus, the inverter 23 controls the pump 23 of the ice making device. Further, 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 degree) based on the temperature information of the seawater acquired from the temperature sensor T3. Control. The control device 5 increases the heating temperature of the preheater 24 when the temperature of the seawater is lower than the predetermined temperature. For example, the control apparatus 5 reduces the heating temperature of the preheater 24, when the temperature of seawater is higher than predetermined temperature. Seawater passes through the filter 25 of the ice making device, so that condensed impurities and impurities contained in the seawater are supplemented. Examples of the impurities include small pieces of seaweed, sand, and fine ice particles.

  The seawater that has passed 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 cooled to a supercooled state with a subcooling degree of about 2 deg. For example, the seawater is cooled from −2.5 ° C. to −5 ° C. by the heat exchanger 26. The supercooled seawater is released from the supercooled state by the ultrasonic waves of the releaser 27. The control device 5 can also turn the refrigerator 4 and the releaser 27 on and off.

The sherbet ice produced by releasing the supercooled state flows through the first supply pipe 321 and is pumped 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 on the motor 334 according to the IPF to rotate the blade 333. The IPF can be calculated by the following Equation 1, Equation 2, and Equation 3. The calculation of IPF is started, for example, when the temperature of seawater sent out from the ice storage tank 33 reaches a predetermined temperature (0 ° C.). First, the integrated heat generation amount is calculated by Equation 1. In Equation 1, the flow rate is acquired by a flow meter M1 provided in the outgoing piping 42 of brine. Tbr-out is acquired by the temperature sensor T2 provided in the return pipe 43 for the brine. Tbr-in is acquired by the temperature sensor T1 provided in the outgoing piping 42 of the brine. Cp is the constant pressure specific heat of the brine, and ρ is the density of the brine, and these are obtained as the physical property values of the brine. The SCP generation power is the power 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−preheat amount−SCP generated power × t + previously integrated heat generation amount ··· formula 1

The amount of preheating in Equation 1 is calculated by Equation 2. In Equation 2, TSC-in is acquired by a temperature sensor T3 provided on the downstream side of the forward pipe 21 (on the heat exchanger 26 side), and Ttank-out is upstream of the forward pipe 21 (on the ice storage tank 33 side). It is acquired by the temperature sensor T4 provided in. Cpw is the constant pressure specific heat of water, ρw is the 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 Equation 2

The IPF is calculated based on the integrated heat generation amount calculated from Equation 1 and Equation 2. In Equation 3, the amount of tank water is the amount of water in the ice storage tank 33, ρw is the constant-pressure specific heat of water, and L is the solidification latent heat of water (the amount of heat necessary for all the water in the ice storage tank 33 to become ice).
IPF = cumulative heat generation / (tank water × ρw × L) Equation 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 release device 27 of the ice making device, and ends the ice making.

<< Supply >>
In step S03, sherbet ice is supplied. When the control device 5 receives an instruction to start supplying the ice storage tank 33 with sherbet ice (for example, a switch provided on the operation unit of the control device 5), the control device 5 opens the automatic valve 39 of the ice supply device. State. As a result, sherbet ice having an IPF of 50 to 60% and an ice crystal grain diameter of 0.01 to 0.1 mm flows through the second supply pipe 322 and is pumped to the supply destination. In addition, the control device 5 acquires water level information from the water level gauge 341, and determines whether the seawater level in the ice storage tank 33 is below a predetermined water level (empty state) or a supply stop instruction (for example, on the operation unit of the control device). When the provided switch OFF) is received, the automatic valve 39 of the ice supply device is closed. Thereby, the supply of the sherbet ice having the ice crystal grain diameter of 0.01 to 0.1 mm is completed. When the step S03 is completed, the 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 iced 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 sherbet ice produced by the ice making system 1 of the sherbet ice according to the embodiment has a curved surface of the ice crystal grains, the grains are aligned, and the ice crystal grains are difficult to condense. As a result, the fluidity of sherbet ice is superior to the conventional one. Therefore, clogging of pipes and the like is hardly generated, and sherbet ice can be supplied with less power than conventional. The pump 34 of the supply device does not need to be a dedicated pump for pumping slurry-like liquid, and a general-purpose pump for pumping water can be used. Further, according to the ice making system 1 for sherbet ice according to the embodiment, the value of IPF can be made larger than before. Specifically, in the technology for peeling 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 is 50 to 60%. It can be. Therefore, the ice storage tank 33 can be made smaller than before. Or more sherbet ice can be stored than before.

  Moreover, according to the ice making system 1 for sherbet ice according to the embodiment, sherbet ice having a lower salinity than that in the past can be made. Specifically, in the technology of peeling off the ice making layer generated on the inner wall surface of the conventional cooler with a scraper, the corresponding salinity concentration is 1.0 to 3.5% (3.5% corresponds to the seawater salinity concentration). there were. On the other hand, in the ice making system 1 for sherbet ice according to the embodiment, sherbet ice having a salt concentration of less than 1% can be made, and sherbet ice having an arbitrary salt concentration can be made. In addition, the conventional technology that peels off the ice-making layer generated on the inner wall of the cooler with a scraper is likely to cause a failure of the ice generator, which may be caused by the load at the time of peeling, such as the blade of the scraper being damaged. There was concern. In addition, the maintenance work has become a burden. On the other hand, in the ice making system 1 for 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 produced by the ice making system 1 of the sherbet ice according to the embodiment for maintaining the freshness of the marine product, the quality of the marine product can be maintained longer than before.

  Further, according to the ice storage tank 33 according to the embodiment, the sherbet ice is accommodated in the region on the stirrer (shaft 332, wing 333, motor 334) side by the punching plate 335, so that the ice particles can also be stirred (shaft 332, It can be accommodated in the area on the wing 333 and motor 334) side. As a result, the ice particles can be prevented from flowing into the ice making system 1, and freezing in the heat exchanger 26 and occurrence of clogging in the piping (for example, the outgoing piping 21) can be suppressed. Therefore, stable ice making can be performed. Further, according to the ice storage tank 33 according to the embodiment, since it is possible to prevent the ice particles from flowing into the ice making system 1, the ice making tank 1 can be stirred during ice making and stable ice making as described above. It can be performed. As a result, the efficiency of ice making can be improved. Moreover, when stirring was stopped during ice making and stirring was started when sherbet ice was supplied, there was a concern that the load at the start of stirring was large. On the other hand, according to the ice storage tank 33 according to the embodiment, the load does not increase at the start of stirring. Further, in the prior art, in order to avoid an increase in load at the start of stirring, it is necessary to suppress the IPF value during 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 50 to 60%. Therefore, the ice storage tank can be made smaller than before. Or more sherbet ice can be stored than before.

<Modification>
FIG. 4 shows a block diagram of a sherbet ice making system according to a modification. Around the heat exchanger 26, the pipes can be frozen or clogged. Therefore, the ice making system 1 for sherbet ice according to the modified example is further provided with a bypass pipe 61 in the vicinity of the heat exchanger 26, detects the flow rate flowing through the return pipe 22 and the flow rate flowing through the bypass pipe 61, and from these flow rates. Detect freezing and blockage. And when freezing is detected, it heats with a heater, and when blockade is detected, it passes water. In addition, about the structure similar to embodiment, the same code | symbol is attached | subjected and description is omitted.

As shown in FIG. 4, the bypass pipe 61 is located in the vicinity of the heat exchanger 26, and the forward pipe 21.
And the return pipe 22. The bypass pipe 61 is provided with a flow meter M3. Further, a heater 45 is provided in the brine outgoing pipe 42.

  The control device 5 acquires the supercooling 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 rate G1 <rated 90% and G2> rated 120%. In this case, the control device 5 turns off the pump 23 of the refrigerator 4 and the ice making device, turns on the heater 45, passes the brine heated by the heater 45 through the heat exchanger 26, and melts the frozen portion. . Further, the control device 5 detects that a blockage has occurred when the main flow rate of the supercooling water G1 <rated 100% and G2 <rated 90%. In this case, the control device 5 turns off the refrigerator 4, allows supercooled water to flow, and flushes the blocked portion.

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

<Example>
The confirmation test of the sherbet ice made by the ice making system 1 for the sherbet ice according to the embodiment will be described. In the confirmation test, salt water with a salt concentration of 2.5% was cooled at a supercooling degree of 2K, and then released sherbet ice was observed and photographed with a microscope, and the diameter of ice crystal grains was measured from the photographed image. In addition, as a comparative example, sherbet ice made by assuming a conventional scraping-type ice making method was photographed. Specifically, ice produced by applying fresh water to a cooled metal plate was scraped off with a blade and put into salt water to form a sherbet, which was observed and photographed with a microscope. In this comparative example, ice was produced by applying fresh water to a cooled metal plate, but the ice produced by applying fresh water and the ice produced by applying salt water are, in principle, only the fresh water component. There is no change in becoming ice, and it can be considered that the conditions are the same.

  Here, FIG. 5 shows a photographed image (500 times magnification) of the sherbet ice made by the ice making system 1 for sherbet ice according to the embodiment. FIG. 6 shows a photographed image (150 × magnification) of the sherbet ice produced by the ice making system 1 for sherbet ice according to the embodiment. On the other hand, FIG. 7 shows a photographed image (magnification 500 times) of sherbet ice that has been made by 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. Moreover, FIG. 8 shows the enlarged view of the right figure of FIG.

  As shown in FIG. 5, according to the ice making system 1 for sherbet ice according to the embodiment, sherbet ice having a curved surface and an ice crystal grain diameter of 0.01 to 0.1 mm is made. 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 grains with a diameter of 0.01-0.1 mm are disperse | distributing uniformly. On the other hand, in the comparative example, as shown in the left diagram of FIG. 7, the ice crystal grains of the sherbet ice made by assuming 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 unevenly. Further, as shown in the right figure of FIG. 7 and FIG. 8, the ice crystal grains of the sherbet ice produced by assuming the conventional scraping-type ice making method are easily combined with each other, and the ice crystal grains adjacent to each other are easily combined. It was confirmed that it was easy. As described above, the ice crystal grains of the sherbet ice produced 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 produced by assuming the conventional scraping type ice making method. It was confirmed that the diameter was small, the grains were uniform, and the curved surface was uniform and smooth. The fact that the diameter is small, the grains are uniform, and the surface curved surface is uniform and smooth is considered to be a factor that the ice crystal grains are difficult to condense and difficult to enlarge.

The various contents described above can be combined as much as possible without departing from the technical idea of the present invention. For example, in the above-described embodiment, the example in which the supply process is performed after the ice making process is described, but the supply process may be performed while the ice making process is performed. Driving variations will increase and convenience will improve. Further, for example, in the above embodiment, the case where sherbet ice is made from seawater and used for maintaining the freshness of marine products has been described as an example, but sherbet ice is made from fresh water and used for maintaining the freshness of vegetables and the like. Also good.

DESCRIPTION OF SYMBOLS 1 ... Ice making system 2 ... Ice making apparatus 26 ... Heat exchanger 27 ... Release device 3 ... Supply device 33 ... Ice storage tank 335 ... Punching plate 4 ... Refrigerator 5 ... Control device 6 ... Seawater treatment device

Claims (7)

An ice making device for making sherbet ice by releasing the supercooled state after bringing the water containing at least one of salt water and fresh water into a supercooled state;
A supply device for supplying the sherbet ice produced by the ice making device while storing it in an ice storage tank ;
With
The ice making device includes a heat exchanger that brings the water into a supercooled state, a refrigerator that cools a supercooling medium supplied to the heat exchanger, and a liquid state between the heat exchanger and the refrigerator A heater for heating the supercooling medium circulated in
Sherbet ice making system. The ice making device includes: a filter that removes impurities contained in the water of the ice storage tank that has passed through a partition portion through which the water of the ice storage tank can pass; and ice contained in the water of the ice storage tank that has passed through the partition portion. A preheater for melting the
The ice making system for sherbet ice according to claim 1. The preheater is disposed between the ice storage tank and the filter;
The ice making system for sherbet ice according to claim 2. The filter captures ice contained in water that passes through the preheater and flows to the heat exchanger;
The ice making system for sherbet ice according to claim 3. The ice making device makes sherbet ice by releasing the supercooled state after the seawater is supercooled by the heat exchanger,
The ice making system of the sherbet ice as described in any one of Claim 1 to 4. A salt concentration adjusting means for adding fresh water to the seawater and adjusting the salt concentration of water supplied to the ice storage tank;
The ice making system for sherbet ice according to any one of claims 1 to 5. An ice making step of making sherbet ice by releasing the supercooled state after bringing the water containing at least one of salt water and fresh water into a supercooled state;
A supply step of supplying the sherbet ice made in the ice making step while storing the ice,
Wherein the ice making process, a heat exchanger subcooling medium temperature is adjusted is supplied by a refrigerator, between the heat exchanger and the refrigerator heater for heating the supercooled medium is provided The water is supercooled in the heat exchanger by the supercooling medium circulating in a liquid state in the circulation path ;
How to make sherbet ice.