JP3584671B2 - Cooling system in production process - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling system in a production process using an ice heat storage system.
[0002]
[Prior art]
There are various cooling systems in the production process, such as cooling with tap water or industrial water, cooling with a refrigerator, cooling with ice heat storage, and the like. One use of this cooling system is a gas turbine generator. This gas turbine generator is used for self-supply of a large amount of electric power required in a production process. However, the gas turbine generator has a characteristic that its output decreases as the temperature of intake air increases. For this reason, there is a problem that the gas turbine generator cannot exhibit sufficient performance in summer when power demand is high. In order to solve this problem, a means for cooling the air on the intake side of the gas turbine generator is employed.
[0003]
For this means, an ice heat storage method for freezing tap water or industrial water has recently been adopted in recent years. The ice heat storage system includes an ice making section for making ice and storing ice, and a cold water circulating section for circulating cold water obtained by melting the ice in the ice making section to an intake cooling section of a gas turbine generator. In general, in the production processes of various industries, tap water and industrial water are used as a large amount of cooling water in addition to the cooling of the gas turbine generator. It has been reused using various recycling methods.
[0004]
In addition, as a reuse system, industrial wastewater such as cooling water and washing water is used by a simple physical precipitation method, a chemical treatment method such as neutralization, and a water treatment method using a biological treatment method such as an activated sludge method. Has been reused.
[0005]
[Problems to be solved by the invention]
The cold and hot water in the ice heat storage system used for cooling the intake of the gas turbine generator described above is used only for cooling the intake of the generator. This is because, in order to divert the cold water into the cooling step of the production process, it is difficult to use a processing method for inexpensively regenerating the deterioration of the cold water quality. Further, since the cooling water in the ice heat storage method is a solution containing a special refrigerant and has a condition that the water quality level as the cooling water is constant, it is difficult to divert the cooling water in the production process. There's a problem.
[0006]
Further, the cooling in the production process is mainly performed by industrial water. Depending on the type of business, the cooling water becomes polluted wastewater during the cooling of the production process, and there is a problem that the treatment method is difficult to reuse at low cost. In addition, as a recycling system, there is a water treatment method using a mere physical precipitation method, a chemical treatment method such as neutralization, a biological treatment method such as activated sludge, etc. However, there is a problem that the reprocessing cost becomes high. In addition to these two problems, in some industries, the water treatment method in the cooling and reuse system in the above-mentioned production process discharges only by simple treatment, and causes the land subsidence due to the pumping of industrial water.
[0007]
The present invention has been made in view of the above circumstances, and separates and generates pure ice ice blocks and concentrated sewage from wastewater that has been used in the production process, and stores the ice blocks in an ice heat storage water tank to reduce the cooling heat of the water tank. An object of the present invention is to provide a cooling system in a production process used for cooling the production process.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a pure ice making apparatus that cools waste water, and separates and generates pure ice and concentrated waste water from the cooled waste water. An ice heat storage water tank that stores the generated pure ice, melts the stored pure ice, and stores it as cooling water; a first cooling unit to which cooling water stored in the ice heat storage water tank is supplied; (1) A second cooling unit comprising a production process in which cooling water after cooling the cooling unit is supplied, and a wastewater after cooling the second cooling unit are supplied to the pure ice making apparatus and stored as condensate water. A condensate storage tank, an evaporator, and a condenser, wherein the evaporator cools the wastewater supplied to the pure ice making device and the condenser side warms the condensate in the condensate water storage tank. And a refrigeration unit operated with surplus power
The pure ice making apparatus includes a tank into which drainage is introduced, an air diffuser disposed in the water in the tank, and continuously blowing bubbles into the water in the tank with air supplied from the outside; A rotating belt disposed so that a part thereof is immersed in water and the other part is located on the water surface, and a rotating belt provided in a position where the rotating belt is immersed in water in the tank, and a rotating belt in this position. A cooling unit disposed inside the cooling unit and cooled by an evaporator of the refrigerating apparatus; and the rotating belt is cooled by the cooling unit, and bubbles from the air diffuser are sprayed on the rotating belt to grow ice crystals. And an ice generator for generating ice by being produced, and a heater for transporting the ice grown in the ice generator by a rotating belt and separating impurities attached to the surface of the ice from pure ice. Is what you do.
[0009]
According to the second to fourth inventions, the first cooling unit includes an intake cooling unit of a gas turbine generator, and the second cooling unit includes a cooling process or a washing process of a production process. The cleaning step is performed, and cooling water cooled in the cooling step is supplied to the cleaning step.
[0011]
According to a fifth aspect of the present invention , pure ice is melted by supplying condensed water from the condensed water storage tank to the ice heat storage water tank.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention. In FIG. 1, reference numeral 10 denotes an ice heat storage device, and the ice heat storage device 10 is configured as follows. Reference numeral 11 denotes a pure ice making device that generates ice blocks from wastewater, which will be described in detail later. The pure ice making device 11 operates the refrigeration unit 12 using inexpensive surplus power such as nighttime power or private power generation, and performs cooling. The wastewater is cooled by the evaporator 121 on the side to generate pure ice with high purity from the wastewater, and separate and generate concentrated wastewater concentrated at a high concentration. Then, the generated concentrated wastewater is sent to the wastewater treatment device 13, and the pure ice is supplied to the ice heat storage water tank 14.
[0013]
The wastewater treatment device 13 collects sludge from the supplied concentrated wastewater. On the other hand, pure ice of high purity is stored in the ice heat storage water tank 14. The pure ice in the ice heat storage tank 14 is melted by the condensate from the condensate water storage tank 15 and stored in the ice heat storage water tank 14 as cooling water at a constant temperature (about 4 ° C.). The cooling water is pumped by a pump 16 and supplied to an intake cooling unit 17a of a gas turbine generator 17 for cooling air. 17b is a compressor, 17c is a turbine, and 17d is a generator.
[0014]
The cooling water pumped by the pump 16 and supplied to the intake cooling unit 17a of the gas turbine generator 17 is supplied to a cooling step 18 of a production process of each type of industry, and is used for cooling the cooling step 18. The wastewater from the cooling process 18 containing the waste heat after the utilization of the cold energy is stored in the condensate water storage tank 15 as condensate water. A condenser 122, which is a heat radiation side of the refrigerating device 12, is attached to the condensate water storage tank 15, so that the condensate in the water storage tank 15 is warmed and the condenser 122 is cooled to improve the efficiency of the refrigerating device 12. I have to.
[0015]
Next, a schematic configuration of the pure ice making apparatus 11 described above will be described with reference to FIG. In FIG. 2, reference numeral 31 denotes a tank into which drainage 41 is introduced from a drainage supply pipe (not shown), and an air diffuser 32 is arranged at an inner bottom of the tank 31. Air is supplied to the diffuser tube 32 from an air pump 33, and bubbles 42 are continuously blown out of the diffuser tube 32. Numeral 34 denotes a rotating belt. A part of the rotating belt 34 is immersed in the drainage water, and the other part is exposed above the water surface of the tank 31. 35a, 35b and 35c are rollers, at least one of which is formed as a driving roller.
[0016]
A cooling unit 36 and a heater unit 37 are disposed inside the rotating belt 34, and the cooling unit 36 cooled by the evaporator 121 of the refrigeration apparatus 12 shown in FIG. The heaters 37 are arranged inside the rotating belt 34 above the tank 31. 38 warm air heater, 39 is a pure ice ice mass, 40 is the ice generating unit.
[0017]
In the pure ice making apparatus 11 configured as described above, the air pump 33 is rotated, and the bubbles 42 are continuously blown out by the air diffuser 32. The waste water is agitated by the bubbles 42, and at the same time, is maintained at 0 ° C. without being supercooled. On the surface of the cooling unit 36, ice crystals grow while removing impurities by continuous blowing of bubbles 42. The grown ice crystals are conveyed by the rotating belt 34, and when they reach the position of the heater section 37, the ice is warmed by the heater section 37 and the hot air heater 38. In particular, a part of the ice surface is melted to become water, and The impurities adhering to the surface are washed away by the water and flow off. As a result, pure ice blocks 39 are removed from the rotating belt 34, and the ice blocks 39 are continuously generated. The ice blocks 39 thus generated are stored in the ice heat storage water tank 14 shown in FIG.
[0018]
FIGS. 3 and 4 are schematic configuration diagrams showing second and third embodiments of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals. In the second embodiment of FIG. 3, after cooling water pumped by the pump 16 from the ice heat storage device 14 is supplied to the intake cooling unit 17 a of the gas turbine generator 17, the cooling water is supplied for cooling in the cleaning process 19 of the production process. The drainage from the washing step 19 is supplied to the condensate water storage tank 15 as condensate water. The cooled return water (drainage) that has been cooled in the washing step 19 is supplied to the pure ice making device 11, and pure ice is made in the same manner as in the first embodiment.
[0019]
In the third embodiment of FIG. 4, after supplying the cooling water to the cooling step 18 shown in the first embodiment, the cooling water discharged from the cooling step 18 is supplied for cooling in the cleaning step 19. The waste water after cooling the washing step 19 is supplied to the pure ice making apparatus 11, and thereafter pure ice is made in the same manner as in the first embodiment.
[0020]
【The invention's effect】
As described above, according to the present invention, the configuration is different from the ice heat storage system that freezes tap water or industrial water, and the wastewater that has been used in the production process is used by the pure ice making apparatus to remove pure ice blocks and concentrated sewage. The generated ice blocks are stored in an ice storage water tank and the cold energy is used to cool the production process while maintaining good water quality. Cold heat can be used. Further, according to the present invention, the wastewater is cooled by the cold heat obtained by operating the refrigerating apparatus using surplus power such as nighttime power or privately generated power to separate pure ice and concentrated sewage in the pure ice making apparatus. There are advantages that can contribute to generation. Further, the separated concentrated sewage can be processed into high-concentration sludge by the sewage treatment apparatus.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a pure ice making apparatus.
FIG. 3 is a schematic configuration diagram showing a second embodiment of the present invention.
FIG. 4 is a schematic configuration diagram showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Ice heat storage device 11 ... Pure ice making device 12 ... Refrigeration device 13 ... Wastewater treatment device 14 ... Ice heat storage water tank 15 ... Condensate water storage tank 16 ... Pump 17 ... Gas turbine generator 18 ... Cooling process 19 ... Cleaning process

Claims (5)

A pure ice making device that cools the waste water, separates and produces pure ice and concentrated waste water from the cooled waste water, stores the pure ice generated by the pure ice making device, and melts the stored pure ice. An ice heat storage water tank for storing cooling water as cooling water, a first cooling unit to which the cooling water stored in the ice heat storage water tank is supplied, and a production process to supply the cooling water after cooling the first cooling unit. A second cooling unit, a condensate water storage tank for supplying waste water having cooled the second cooling unit to the pure ice making device, and storing the water as condensate; an evaporator; and a condenser. A refrigerating device that is operated with surplus power so as to cool wastewater supplied to the pure ice making device on the side and to warm condensate in the condensate storage tank on the condenser side.
The pure ice making apparatus includes a tank into which drainage is introduced, an air diffuser disposed in the water in the tank, and continuously blowing bubbles into the water in the tank with air supplied from the outside; A rotating belt disposed so that a part thereof is immersed in water and the other part is located on the water surface, and a rotating belt provided in a position where the rotating belt is immersed in water in the tank, and a rotating belt in this position. A cooling unit disposed inside the cooling unit and cooled by an evaporator of the refrigerating apparatus; and the rotating belt is cooled by the cooling unit, and bubbles from the air diffuser are sprayed on the rotating belt to grow ice crystals. An ice generating section in which ice is generated by being produced, and a heater that transports the ice grown in the ice generating section by a rotating belt and separates pure ice from impurities adhering to the ice surface.
A cooling system in a production process , characterized in that: The cooling system according to claim 1, wherein the first cooling unit includes an intake cooling unit of a gas turbine generator. The cooling system according to claim 1, wherein the second cooling unit includes a cooling process or a cleaning process in a production process. The cooling system according to claim 1, wherein the second cooling unit includes a cooling step of a production step and a cleaning step, and cooling water cooled in the cooling step is supplied to the cleaning step. The cooling system in the production process according to any one of claims 1 to 4, further comprising supplying condensed water from the condensed water storage tank to the pure ice storage tank to melt the pure ice.

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