JP3985861B2 - Ice making equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, autologous power generation facilities using liquefied natural gas (LNG), relates ice making device which is adapted to ice by effectively utilizing the cold of the LNG.
[0002]
[Prior art]
Usually, an ice making machine produces ice with a refrigerator using chlorofluorocarbon or the like. For example, an example of an ice making device equipped with such an ice making machine is shown in FIG. In FIG. 2, reference numeral 31 denotes an ice making machine in which a plurality of ice making plates 32 are arranged. Reference numeral 33 denotes a refrigerator that cools the chlorofluorocarbon supplied to the ice making machine 31 as a refrigerant. Reference numeral 34 denotes a heat source such as a heater for heating the ice making plate 32, which is used for removing ice from the ice making plate 32. Reference numeral 35 denotes a cooling tower for cooling the ice making water. Reference numeral 36 denotes a supply pipe for supplying the ice making water to the cooling tower 35 from outside the apparatus. Reference numeral 37 denotes a feed pipe that feeds ice-making water from the cooling tower 35 to the ice making machine 31, and is provided with a pump 38 for feeding ice-making water. Reference numeral 39 denotes a return pipe for returning the ice making water in the ice making machine 31 to the cooling tower 35.
[0003]
In the above ice making device, at the time of ice making, the ice making water of the cooling tower 35 is supplied to the ice making machine 31 via the supply pipe 37 and supplied so as to form ice on the surface of each ice making plate 32 in the ice making machine 31. Then, the chlorofluorocarbon cooled by the refrigerator 33 is supplied to the ice making machine 31 to cool each ice making plate 32, thereby freezing the ice making water on the surface of each ice making plate 32 (see FIG. 3). . Further, at the time of deicing, the ice making plates 32 are heated by the heat source 34, and the frozen surfaces of the ice frozen on the ice making plates 32 are melted to deice. After that, the deiced ice is crushed with a crusher or the like to make crushed ice.
[0004]
On the other hand, in large supermarkets and the like, stores equipped with private power generation facilities are increasing. An example of such a private power generation facility is shown in FIG. In this example, LNG is used and burned to rotate the gas turbine 45, and the generator 46 is rotated by this rotational force to obtain electric power. More specifically, the LNG taken out from the tank 41 containing LNG is introduced into the evaporator 42, where it is vaporized by exchanging heat with the atmosphere or hot water, and the natural gas produced by this vaporization is the fuel of the gas turbine 45. To the combustor 43. On the other hand, in the gas turbine 45, the air taken in from the outside by the air compressor 44 is compressed and introduced into the combustor 43, where it is burned with the natural gas, and the thrust of the combustion gas injected from the combustor 43 is used. The gas turbine 45 is rotated, and the generator 46 is rotated by this rotational force. At this time, the exhaust gas discharged from the gas turbine 45 is released into the atmosphere.
[0005]
[Problems to be solved by the invention]
On the other hand, the ice making device shown in FIG. 2 consumes about 3.7 kW of electric power in the refrigerator to produce 1 ton of ice per day, and the power consumption is large. Furthermore, in the private power generation facility shown in FIG. 4, the LNG taken out from the tank 41 is vaporized by heat exchange, and the natural gas generated by this vaporization is used as fuel for the gas turbine 45 and then released into the atmosphere as exhaust gas. The cold heat of LNG is discarded without being recovered.
[0006]
The present invention has been made in view of such circumstances, by effectively utilizing LNG cold heat using private power electric facility Bei, the providing of the ice making apparatus capable of saving energy and an object.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the ice making apparatus of the present invention cools the ice making plate with a refrigerant, cools the ice making water in contact with the ice making plate, freezes the ice making water on the surface of the ice making plate, and then makes the ice making plate. the a ice making apparatus which so that give the ice by the ice removal warmed by heat medium, the liquefied natural gas used as fuel in the house power plant is introduced into the heat exchanger with the refrigerant, liquefied in the heat exchanger The refrigerant is cooled with natural gas, the ice making plate is cooled with the cooled refrigerant, ice is made, and the natural gas evaporated and generated by cooling the refrigerant with the heat exchanger is supplied as fuel to the private power generation facility. The exhaust gas generated by the combustion of natural gas is discharged from the private power generation facility to warm the heating medium, and the ice making plate is heated by the heated heating medium.
[0008]
That is, the ice making device of the present invention cools the ice making plate with the refrigerant, cools the ice making water in contact with it , freezes the ice making water on the surface of the ice making plate, and then makes the ice making plate warm with a heating medium and then separated. an ice making apparatus which so that give the ice to the ice, the liquefied natural gas together with the refrigerant introduced into the heat exchanger, the refrigerant is cooled by vaporizing the liquefied natural gas by the heat exchanger, and the cooled refrigerant The ice making plate is cooled to make ice. Thus, in the ice making device of the present invention, the refrigerant is cooled using the cold of liquefied natural gas without using a refrigerator, and the cold of LNG used for private power generation facilities can be used effectively. Energy saving can be achieved.
[0009]
In the present invention , the natural gas vaporized and generated when the refrigerant is cooled by the heat exchanger is supplied to the private power generation facility as fuel, and the heating medium is heated by the exhaust gas discharged from the private power generation facility, and the heated heat warm the ice making plate by medium, because you have to ice removal ice in contact with it, and to warm the thermal medium by utilizing heat of exhaust gas discharged from the private power generation facility, the more energy saving Can be planned.
[0010]
Next, the present invention will be described in detail.
[0011]
The ice making device of the present invention includes a refrigerant for cooling the ice making plate and a heat medium for warming the ice making plate for ice making and ice removal.
[0012]
As the refrigerant, various refrigerants such as chlorofluorocarbon, alcohols, and ethylene glycol are used, and hot water is used as the heat medium.
[0013]
As the private power generation facility, various generators such as a gas turbine are used.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 shows an embodiment of the ice making device of the present invention. In this embodiment, the ice making device is provided in a large supermarket or the like, and the ice made by the ice making device is used for cooling food items or the like in the large supermarket or the like. Reference numeral 1 denotes an ice making machine which uses chlorofluorocarbon as a refrigerant and hot water as a heat medium. Reference numeral 2 denotes a refrigerant circulation pipe through which the refrigerant circulates, and the refrigerant circulation pipe 2 is provided with a first circulation pump 3. Reference numeral 4 denotes a heat medium circulation pipe through which the heat medium circulates. A second circulation pump 5 is provided in the heat medium circulation pipe 4. In FIG. 1, 32 is an ice making plate, 35 is a cooling tower, 36 is a supply pipe, 37 is a feed pipe, 38 is a pump, 39 is a return pipe, and these have the same structure as before (for example, FIG. The same structure as that used in the ice making apparatus 2 is used.
[0016]
Reference numeral 6 denotes a natural gas introduction pipe that vaporizes the LNG taken out from the tank 41 and introduces the natural gas generated by the vaporization into the combustor 43. The natural gas introduction pipe 6 vaporizes the LNG taken out from the tank 41. A first heat exchanger 7 for generating natural gas is provided. And in this 1st heat exchanger 7, heat exchange with LNG taken out from tank 41 and the refrigerant which passed through ice making machine 1 is performed, LNG is vaporized and natural gas is generated, while refrigerant is cooled. Is done. Reference numeral 8 denotes a discharge pipe that discharges the exhaust gas discharged from the gas turbine 45 into the atmosphere. A second heat exchanger 9 is provided in the discharge pipe 8. And in this 2nd heat exchanger 9, heat exchange with the exhaust gas discharged | emitted from the gas turbine 45 and the heat medium which passed through the ice making machine 1 is performed, and a heat medium is heated. In this embodiment, the tank 41, the combustor 43, the air compressor 44, the gas turbine 45, and the generator 46 have the same structure as the conventional one (the same structure as that used in the private power generation facility in FIG. 4). It is used.
[0017]
In the above configuration, at the time of ice making, ice making water from the cooling tower 35 is supplied to the ice making machine 1 through the supply pipe 37 and supplied so as to form ice on the surface of each ice making plate 32 in the ice making machine 1. Then, the refrigerant discharged from the first circulation pump 3 is supplied to the ice making machine 1 to cool each ice making plate 32, thereby freezing the ice making water on the surface of each ice making plate 32 to make ice (FIG. 3). At the time of deicing, the heating medium heated by the second heat exchanger 9 is passed through the ice making plates 32, and the frozen surfaces of the ice frozen on the ice making plates 32 are melted and deiced. After that, the deiced ice is crushed with a crusher or the like to make crushed ice. Note that, similarly to the conventional system (ice making apparatus shown in FIG. 2), the refrigerant and the heat medium are alternately supplied, and the simultaneous supply is not performed.
[0018]
On the other hand, the LNG taken out from the tank 41 is introduced into the first heat exchanger 7, where the LNG is vaporized by exchanging heat with the refrigerant in the refrigerant circulation pipe 2, and the natural gas generated by this vaporization is converted into a gas turbine. 45 is introduced into the combustor 43 as fuel. And in the case of the said vaporization, the refrigerant | coolant in the refrigerant | coolant circulation pipe 2 is cooled. On the other hand, in the gas turbine 45, the air taken in from the outside by the air compressor 44 is compressed and introduced into the combustor 43, where it is burned with the natural gas, and the thrust of the combustion gas injected from the combustor 43 is used. The gas turbine 45 is rotated, and the generator 46 is rotated by this rotational force. Further, the exhaust gas discharged from the gas turbine 45 is introduced into the second heat exchanger 9, where the exhaust gas is cooled by exchanging heat with the heat medium in the heat medium circulation pipe 4, and released into the atmosphere. And in the case of the said cooling, the heating medium in the heating-medium circulation pipe 4 is heated. In this embodiment, about 1 ton of ice can be produced per day by 30 kW cogeneration, and energy of about 3.7 kW is saved.
[0019]
As described above, in this embodiment, the cooling heat of the LNG is effectively utilized to cool the refrigerant, and the heat medium is effectively utilized to warm the exhaust gas discharged from the gas turbine 45. Significant energy savings can be achieved.
[0020]
In addition, in the said embodiment, although gas turbine power generation is used, it is not limited to this.
[0021]
【The invention's effect】
As described above, according to the ice making apparatus of the present invention, without using a refrigerator, by utilizing the cold energy of the liquefied natural gas is cooled refrigerant, the effective use of LNG cold using private power electric facility Bei Energy saving.
[0022]
In the present invention , the natural gas vaporized and generated when the refrigerant is cooled by the heat exchanger is supplied to the private power generation facility as fuel, and the heating medium is heated by the exhaust gas discharged from the private power generation facility, and the heated heat warm the ice making plate by medium, because you have to ice removal ice in contact with it, and to warm the thermal medium by utilizing heat of exhaust gas discharged from the private power generation facility, the more energy saving Can be planned.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an ice making device of the present invention.
FIG. 2 is a configuration diagram showing an example of a conventional ice making device.
FIG. 3 is an explanatory view showing the operation of the ice making plate.
FIG. 4 is a configuration diagram showing an example of a conventional private power generation facility.
[Explanation of symbols]
7 First heat exchanger 32 ice making plate

Claims (1)

The ice making plate cooled by refrigerant, and to so that give the ice by the ice removal warmed by the heating medium to the ice making plate After ice frozen ice water on the surface of the ice making plate to cool the ice making water in contact with this An ice making device, wherein liquefied natural gas used as fuel in a private power generation facility is introduced into a heat exchanger together with the refrigerant, the refrigerant is cooled by the liquefied natural gas in the heat exchanger, and the ice making plate is cooled by the cooled refrigerant. The natural gas vaporized and generated by cooling the refrigerant in the heat exchanger is supplied to the private power generation facility as fuel, and the exhaust gas generated by the combustion of natural gas in the private power generation facility is discharged from the private power generation facility. An ice making device characterized in that the heating medium is heated and the ice making plate is heated by the heated heating medium.

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