JP3738993B2 - Cooling apparatus and process cooling wastewater recovery method using the apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the reuse of cooling wastewater discharged from industrial process cooling devices used in various cooling applications including the food industry and beverage industry, and for cooling higher by 3 to 5 ° C. than the outside air wet bulb temperature. The present invention relates to a cooling device for drainage and a recovery method that enables recovery, cooling, and recirculation of cooling wastewater using the device.
[0002]
[Prior art]
Many proposals have been made for cooling apparatuses for cooling wastewater discharged from industrial processes.
Looking at those proposals, most of the proposals are limited to 18-29 ° C, 14-30 ° C, 15-20 ° C, and the uses for industrial process cooling water they are intended for are as follows: There is something.
a, Air conditioning in production lines such as precision equipment, and research facilities. Stable cooling water near room temperature, cooling water used for clean room air conditioning, precision processing machines and CVD are also adjusted to a medium to low temperature range of 14-30 ° C. Cooling water c, cooling water adjusted to a medium to low temperature range of 18 to 29 ° C. (disclosed in JP-A-2001-108394)
d, cooling water used for a cooling device for a heat transfer medium for machine tools
The outline of the proposal described in the item c will be described below with reference to the drawings.
This proposal is disclosed in Japanese Patent Application Laid-Open No. 2001-108394. The purpose of this proposal is to cool the cooling wastewater, which is the fluid to be cooled, discharged from the equipment to be cooled, and then return to the equipment to be cooled. In particular, it relates to a cooling device that prevents heating of cooling drainage generated in the cooling tower of the cooling device,
As shown in FIG. 5, the cooling device includes a cooling tower 51 having a heat transfer pipe 52 and a fan 53, a chiller 50, and cooling water discharged from the equipment 60 to be cooled. Valves 55a and 55b forming a switching means between a pipe line passing through the cooling tower 51 to be refluxed to the equipment 60 in sequence, a bypass pipe line 54 excluding the cooling tower 51 from the pipe line, and a pipe line passing through the cooling tower 51 When the inlet temperature of the cooling tower 51 is lower than the outlet temperature, the pipe passing through the cooling tower 51 is closed via the valve 55a and the bypass pipe 54 is connected via the valve 55b. Operate only with the chiller 50 as open, store the value obtained by subtracting the outside air dry bulb temperature (open type) or wet bulb temperature (sealed type) from the inlet temperature of the cooling tower at the time of switching, and operate only the chiller Have When the value obtained by subtracting the outside air dry bulb temperature or the wet bulb temperature from the cooling tower inlet temperature is larger than the value at the time of switching, control is performed so that the pipe line passing through the cooling tower is opened and the bypass pipe line is closed. The cooling tower 51 and the chiller 50 are operated and cooled, and the cooling tower is efficiently operated and cooled with energy saving.
[0004]
As seen in the above proposal, the cooling device for cooling wastewater discharged from the equipment 60, which is an industrial process, includes a cooling tower 51 having a heat transfer pipe 52 and a fan 53, and a chiller 50, and is discharged from the equipment 60. The cooling wastewater is sent from the cooling tower 51 to the chiller 50 in that order and returned to the equipment 60 for predetermined cooling,
While the outside air temperature is high and the cooling tower inlet temperature is lower than the outlet temperature, the cooling tower 51 is short-circuited and only the chiller 50 is operated in order to avoid heating the cooling wastewater by the outside air.
And when outside temperature becomes low, it is set as the structure which cools by the cooling tower 51 and the cooling by the driving | operation of the chiller 50. FIG.
That is, the cooling by the cooling tower is stopped during the summer season when the outside air temperature is high, and only the chiller is operated, and the cooling by the cooling tower and the cooling by the cooling tower are combined in other seasons including the winter season.
[0005]
However, in the case of the above configuration, as described above, the switching control of the short circuit pipe of the cooling tower determines the cut-off of the cooling tower by comparing the cooling tower inlet temperature and the outlet temperature, and the cooling tower at the time of this switching Store the value obtained by subtracting the outside air dry bulb temperature or wet bulb temperature from the entrance temperature, and if the value obtained by subtracting the outside air dry bulb temperature or wet bulb temperature from the cooling tower entrance temperature is greater than the value at the time of switching, cooling is performed. While requiring complicated control to open the pipeline passing through the tower and close the bypass pipeline, the cooling drainage used is limited to the mid to low temperature range of 18-29 ° C.
[0006]
Further, there is a conventional cooling device that is generally used as shown in FIG. As shown in the figure, the cooling device includes a closed type cooling tower 65 having a heat transfer coil as a cooling coil 61, a sprinkler 62 and a fan 63, and an open type cooling tower 68 comprising a sprinkler 66 and a fan 67. The cooling water according to the wet bulb temperature is obtained by the above, and the condenser 73 cooled by the cooling water and the refrigeration chiller 71 including the compressor 69, the evaporator 70, and the like are configured to form equipment that is an industrial process. Cooling wastewater discharged from the load 72 passes through the sealed cooling tower 65 and then returns to the load 72 via the evaporator 70 of the chiller 71.
In the above conventional method, the cooling drainage is cooled by placing the hermetic cooling tower 65 in the preceding stage and placing the chiller 71 in the latter stage, and the chiller has an open type cooling tower dedicated to the condenser. 68 is provided.
[0007]
In the case of the above method, the cooling wastewater that has been charged can be cooled to near the wet bulb temperature at that time in the sealed cooling tower 65 in an ideal state. Therefore, when the cooling by the hermetic cooling tower 65 is not sufficient, the chiller 71 is operated, further cooled through the evaporator 70, cooled to the target temperature, and returned to the load 72 as the equipment. .
When the temperature of the cooling wastewater to be charged is lower than the wet bulb temperature, it is heated by passing through the hermetic cooling tower 65. The temperature is considered to be 3 to 5 ° C. higher than the wet bulb temperature.
[0008]
Then, when the outside air temperature is low, such as in winter, when the cooling wastewater introduced by cooling only the cooling coil 61 is low, the chiller 71 is not operated and is returned to the load 72. In order to stop the compressor 69, it is necessary to increase the capacity of the hermetic cooling tower 65 used for the preceding stage cooling, which increases the equipment cost.
[0009]
A conventional cooling device that is generally used is shown in FIG. As shown in the figure, the cooling device includes a cooling tower 80, a heat exchanger 81, a refrigerator 82, and a load 83 which is a discharge source for discharging cooling waste water.
In the summer, as shown in FIG. 5A, the cooling tower 80 is used to dissipate cooling water from a condenser (not shown) of the refrigerator 82, and the cooling water is cooled by the refrigerator 82. In the intermediate period / winter period, as shown in (B) of the figure, the cooling water is directly cooled by the cooling tower 80 via the heat exchanger 81 without operating the refrigerator 82.
[0010]
Since the cooling temperature depends on the outside air state, the cooling temperature is used for applications that have a cooling load throughout the year and can be cooled at a relatively high temperature.
In recent years, production facilities tend to use a large amount of cooling water of about 15 to 25 ° C. for cooling process production equipment. In such a case, the energy saving effect can be improved. If it cannot be exhausted, full load operation of the refrigerator is required.
[0011]
Further, during milk purification, cooling after ultra high temperature sterilization (UHT), cooling for food pasteurization, etc. are used. For example, FIG. It is shown.
As shown in the figure, the present path riser 110 is internally equipped with a conveyor 150a that conveys in the direction of the dotted line arrow, and high temperatures such as bottles and cans filled with high-temperature, short-time sterilized or ultra-high-temperature sterilized products. It is a tunnel-type cooling device that is loaded with a work 150 and is gradually cooled from a high temperature of about 75 ° C. to a low temperature of about 30 ° C. A plurality of cooling tanks that absorb and cool the heat of the work by circulating injection of cooling water. The first cooling region 111, the intermediate cooling region 112, and the final stage cooling region 113 provided are provided from the upstream to the downstream, and an adsorption refrigerator 119 is provided between the first cooling region 111 and the final stage cooling region 113, The cooling area 112 is provided with a cooling tower 120,
Rinsing water 122 of about 20 ° C. is supplied to the most downstream cooling tank, and the cooling tank temperature is raised from 20 ° C. to 60 ° C. by circulating injection and overflow 125 sequentially upstream, and 50 ° C. warm water is discharged as cooling water. It is configured to discharge outside.
In other words, in the above-mentioned path riser, cooling water at 50 ° C. is discharged by receiving cold water at 20 ° C.
[0012]
In the case of milk or low-viscosity dairy products, sterilization is performed at 71 ° C., 16 seconds, or 72 ° C. for 15 seconds or more. As described above, the cooling wastewater at 40 ° C. to 60 ° C. is discharged. The cooling water used for these is pumped from 18 to 20 ° C groundwater and heated to 35 to 50 ° C as described above and discharged to the outside. The amount of use is also restricted from the viewpoint of protecting the global environment. The trend of strengthening is being formed. For this purpose, the rapid formation of the means for collecting the discharged cooling water is strongly desired from the viewpoint of water saving, energy saving and environmental protection.
[0013]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems, and relates to the reuse of cooling wastewater discharged from industrial process cooling devices used in various cooling applications including the food industry and the beverage industry. The purpose is to collect cooling wastewater having a temperature higher than the sphere temperature. Therefore, cooling is performed by a cooling tower and a refrigeration chiller equipped with a condenser cooled by cooling water obtained from the cooling tower. The present invention provides a cooling device having a high energy-saving effect throughout the year, such as automatically stopping the operation of the refrigeration chiller when the outside air temperature is low, and a cooling drainage recovery method using the device.
[0014]
[Means for Solving the Problems]
The cooling device of the present invention configured in order to achieve the above object,
A hermetic cooling tower comprising a heat transfer coil, a watering device that circulates and distributes water to the coil, and a blower fan that brings air into contact with the coil surface;
A condenser cooled by cooling water formed by refluxing the heat transfer coil, a compressor connected to the condenser, an refrigeration chiller including an expansion valve, an evaporator, and the like;
The return flow path of the cooling wastewater discharged from the load passes through the heat transfer coil of the hermetic cooling tower and then recirculates through the evaporator of the refrigeration chiller.
[0015]
Invention above SL uses closed cooling tower to the cooling tower, the cooling tower to perform the pre-stage of the cooling of the interior and cooling drainage discharged from the load by heat transfer coils, the subsequent cooling, the A refrigeration chiller having a condenser cooled by cooling water obtained by the heat transfer coil and having output control means is used.
[0016]
In the cooling device of the present invention, the compressor is preferably composed of a capacity control type volumetric compressor.
[0017]
The above matters relate to the use of a capacity control type volumetric compressor for the refrigeration chiller used in the cooling device of the present invention. By using the compressor, stepless or multistage capacity control by a slide valve or the like is possible. Thus, the chiller output is automatically controlled as the condensation temperature and the condensation pressure decrease when the outside air temperature decreases.
In other words, since the refrigeration chiller has a capacity control type volumetric compressor, the compressor output is automatically controlled as the condenser condensing temperature changes due to fluctuations in the outside air. It is possible to reduce the output capacity of the refrigerator in the middle of summer and winter and increase the winter stop period of the latter stage cooling. It is possible to shift without linear and forced control.
[0018]
And, by using the cooling device of the present invention, a cooling drainage recovery method made possible is:
In a method for recycling and recovering waste water for process cooling having a plurality of cooling loads with different temperatures,
Cooling in the return flow path of the cooling drainage discharged from the process load is performed by multiple stages of cooling,
The first stage cooling is performed directly by a cooling heat source formed through a cooling tower,
The latter stage cooling includes indirect cooling through a refrigeration chiller having a condenser cooled by the cold heat source and having an output control means by capacity control, to correspond to the required temperature of the load,
The gist of the invention is that the indirect cooling by the refrigeration chiller is stopped while the outside air temperature is low, and the energy-saving cooling waste water can be collected.
[0019]
The above-described invention describes the process cooling wastewater recovery method enabled by the use of the cooling device of the present invention. That is, the recovery method is that the cooling wastewater heated and discharged from the cooling load of the process. In the process of being cooled again, recovered, and returned to the load, it is formed by a plurality of cooling steps provided before and after.
The cooling process precedes the cooling by the cooling tower in the previous stage, performs the cooling that is possible up to the temperature of the outside wet bulb temperature, and in the subsequent cooling process, a condenser that is cooled by the cooling heat source from the cooling tower is provided. Indirect cooling with a refrigeration chiller is performed, and the subsequent cooling process automatically adjusts the output by the output control means provided in the refrigeration chiller in response to changes in the outside air temperature. is there.
[0020]
As described above, the compressor of the refrigeration chiller in the cooling drainage recovery method preferably forms an output control means by using a capacity control type volumetric compressor to cope with fluctuations in the outside air temperature. Continuous output control is performed.
[0021]
Alternatively, according to the present invention, the cooling tower in the cooling drainage recovery method uses a hermetic cooling tower that indirectly contacts the cooling drainage and the condenser cooling water with air, and through the indirect contact. The cooling of the first stage of the cooling drainage is formed by cooling the second stage, and the second stage is cooled by cooling by the latent heat of evaporation of the refrigeration chiller having a condenser cooled by the cooling water obtained by the indirect contact and having the output control means. Is preferably formed.
[0022]
Alternatively, the cooling tower in the cooling drainage recovery method is a sealed / open type that combines an open type that obtains cooling water by direct contact between water and air and a closed type that indirectly contacts the cooling drainage with air. A cooling tower is used to form the previous stage cooling by indirect contact with the closed type, and a condenser cooled by cooling water according to the wet bulb temperature obtained by the open type is provided and has an output control means. It is preferable to form subsequent cooling by the latent heat of vaporization of the refrigeration chiller.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be exemplarily described below with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the structural parts described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.
FIG. 1 is a diagram showing a schematic configuration of the first invention of the cooling device of the present invention, FIG. 2 is a diagram showing a schematic configuration of the second invention of the cooling device of the present invention, and FIG. FIG. 4 is a diagram showing a schematic configuration of a third invention of the cooling device of FIG. 4, and FIG. 4 is a diagram showing a cooling state corresponding to a load having another load mode in the cooling device of FIG.
[0024]
FIG. 1 shows a schematic configuration of a cooling device as a comparative example of the present invention. As seen in the figure, the cooling device includes a heat exchanger 15 for cooling water generated by the open-type cooling tower 10a and the cooling tower and the cold heat source, a condenser 16 is cooled by the cooling water volume A refrigeration chiller 20 comprising a control-type volume compressor 17 and an evaporator 18, a cold water tank 21, and a circulation path 23, and the heat exchanger 15, the upstream cooling section 23 a of the cooling drainage circulation path 23 is configured. The rear cooling unit 23 b is configured by the evaporator 18 of the chiller 20, and is discharged from the load 22 that is a process cooler and refluxed through the circulation path 23.
The cooling conditions of the front and rear stage parts are shown as follows: the temperature of each part is shown for one example in the case of using a cooling drainage of 42 ° C. at an outside air temperature of 27 ° C. That is, it is cooled to 32 ° C. by the pre-stage cooling unit 23a, and is cooled and refluxed to 18 ° C. by the post-stage cooling unit 23b.
In addition, the cold water tank 21 shown in the figure is attached as necessary to correspond to the load situation.
[0025]
The open-type cooling tower 10a includes a watering device 11, a fan 12, and a water tank 13. The sprayed water sprayed by the watering device 11 is cooled to a temperature 3 to 5 ° C. higher than the outside air wet bulb temperature. The heat exchanger 15 is supplied to the heat exchanger 15 and the condenser 16, and the heat exchanger 15 forms a front cooling unit 23 a, and the condenser 16 operates the chiller 20 to form a rear cooling unit 23 b via the evaporator 18. .
[0026]
As described above, the cooling of the present cooling device depends on the outside wet bulb temperature obtained via the open type cooling tower 10a, and the wet bulb temperature decreases in winter and the like, and cooling by the pre-stage cooling unit 23a is sufficient, The chiller 20 of the rear stage cooling unit 23b is placed in an operation stopped state.
That is, when the outside air temperature is high, the front-stage cooling unit and the rear-stage cooling unit are used at the same time, and when the outside air temperature is low, the capacity control type positive displacement compressor 17 according to the lowering of the outside air temperature and the rear-stage cooling load amount. The capacity control by the control of the slide valve or the like is automatically controlled to correspond to the fluctuation of the outside air temperature, and in an extreme case, it is performed only by the first stage cooling to perform the efficient cooling operation.
[0027]
FIG. 2 shows the configuration of the inventions of the outline of the cooling system of the present invention. As shown in the figure, the cooling device of the present invention comprises a hermetic cooling tower 10b, a heat transfer coil 19 built in the cooling tower, a condenser 16, a capacity-controlled volumetric compressor 17, an evaporator 18, and the like. The refrigerating chiller 20, the chilled water tank 21, and the circulation path 23 are configured. The heat transfer coil 19 configures a front cooling unit 23 a of the cooling drainage circulation path 23, and the evaporator 18 of the chiller 20 performs subsequent cooling. The unit 23b is configured to be discharged from the load 22 which is a process cooler and refluxed through the circulation path 23.
The cooling conditions of the front and rear stage parts are shown as follows: the temperature of each part is shown for one example in the case of using a cooling drainage of 42 ° C. at an outside air temperature of 27 ° C. That is, it is cooled to 32 ° C. by the pre-stage cooling unit 23a, and is cooled and refluxed to 18 ° C. by the post-stage cooling unit 23b.
In addition, the cold water tank 21 shown in the figure is attached as necessary to correspond to the load situation.
[0028]
The hermetic cooling tower 10b includes a sprinkler 11, a fan 12, a water tank 13, and a heat transfer coil 19, and the fluid flowing through the heat transfer coil is cooled to a temperature obtained by adding 3 to 5 ° C to the outside air wet bulb temperature. The cooling water 23a is cooled and cooling water for the condenser 16 is formed.
[0029]
As described above, the cooling of the cooling device depends on the wet bulb temperature of the outside air obtained through the sealed cooling tower 10b. When the outside air temperature is high, the front cooling unit and the rear cooling unit are used at the same time. When the temperature is low, the capacity is controlled by controlling the slide valve of the capacity control type capacity compressor 17 by the lowering of the outside air temperature and the amount of the subsequent cooling load, and the compressor output is automatically controlled. In extreme cases, only the first stage of cooling is performed, and an efficient cooling operation is performed.
[0030]
FIG. 3 shows a schematic configuration of a cooling device of a comparative example of the present invention. As seen in the figure, the cooling device includes a heat transfer coil 19 is decorated in a closed-open compatible type cooling tower 10c and the cooling tower, the condenser 16 and the capacity control type volume compressor 17 evaporator 18 And the like, a chilled water tank 21 and a circulation path 23, and the heat transfer coil 19 constitutes a pre-stage cooling part 23 a of the cooling drainage circulation path 23, and the evaporator 18 of the chiller 20. Thus, the rear-stage cooling unit 23b is configured and discharged from the load 22 which is a process cooler and refluxed through the circulation path 23.
The temperature of each part is shown for one example in which the cooling condition of the front and rear stage parts is an outside temperature of 27 ° C. and a cooling drainage of 42 ° C. is used. That is, it is cooled to 32 ° C. by the pre-stage cooling unit 23a, and is cooled and refluxed to 18 ° C. by the post-stage cooling unit 23b.
In addition, the cold water tank 21 shown in the figure is attached as necessary to correspond to the load situation.
[0031]
The closed / open combined cooling tower 10c includes a watering device 11, a fan 12, a water tank 13, and a heat transfer coil 19, and the fluid flowing through the heat transfer coil 19 is added to the temperature of the outside wet bulb by 3 to 5 ° C. Cooled to a temperature, the cooling water 13a cools the condenser 16 through the water cooled in the open cooling tower structure.
[0032]
As described above, the cooling of the present cooling device depends on the wet and dry bulb temperature of the outside air obtained through the closed / open type combined cooling tower 10c. When the outside air temperature is high, the front cooling unit and the rear cooling unit are used simultaneously. When the outside air temperature is low, the output control is automatically performed by controlling the slide valve of the displacement control type volume compressor 17 that forms the output control means corresponding to the subsequent cooling load amount. In response to temperature fluctuations, in an extreme case, the cooling is performed only in the preceding stage, and an efficient cooling operation is performed.
[0033]
FIG. 4 shows a cooling state corresponding to another aspect of a load which is a process cooler in the cooling apparatus of FIG. 1 according to an embodiment.
As shown in the figure, the loads in this case are a cooler 22a used after flavoring to extract a fragrance from tea and the like, and a pasteurizer 22b which is a cooler used after food super-high temperature sterilization (100-120 ° C). , A case where it is constituted by a cooler 22c used after high-temperature sterilization (70 to 100 ° C.) is shown. Cooling waste water of about 50 ° C. is recirculated to the circulation path 23, and in the summer, the cooling unit 23a 32 It is cooled to about 20 [deg.] C., and is cooled to about 20 [deg.] C. by the rear cooling unit 23b.
In addition, the cold water tank 21 shown in the figure is attached as necessary in the same manner as in FIGS.
[0034]
【The invention's effect】
The present invention has the following effects by the above configuration.
In the cooling device of the present invention, the cooling depends on the dry bulb temperature or wet bulb temperature of the outside air. When the outside air temperature is high, the front cooling unit and the rear cooling unit are used at the same time, and the outside air temperature is low. The output control is automatically performed by controlling the slide valve of the displacement control type capacity compressor that operates according to the cooling load of the latter stage to cope with fluctuations in the outside air temperature. In extreme cases, only the first stage cooling is performed. An efficient cooling operation is performed.
It enables the recovery and reuse of cooling effluent discharged from process cooling equipment that uses a large amount of groundwater as cooling water, prevents pollution of rivers and seas by the cooling effluent, and saves a large amount of water. (Reduction of water intake and drainage) Increases energy saving effect, helps protect the environment, and contributes to reduction of production costs.
[Brief description of the drawings]
1 is a diagram showing an outline Ryaku構 configuration of cooling device of a comparative example of the present invention.
FIG. 2 is a diagram showing a schematic configuration of a second aspect of the cooling device of the present invention.
3 is a diagram showing an outline Ryaku構 configuration of cooling device of a comparative example of the present invention.
4 is a diagram showing a cooling state corresponding to another load mode in the cooling device of FIG. 1. FIG.
FIG. 5 is a diagram showing a schematic configuration of a conventional cooling device for drainage for process cooling.
FIG. 6 is a diagram showing a schematic configuration of a conventional cooling device for drainage for process cooling.
FIG. 7 is a diagram showing a schematic configuration of free cooling that is selectively used depending on the temperature of outside air.
FIG. 8 is a diagram showing a schematic configuration of a pasteurizer that cools a bottle and a canned beverage product after ultra-high temperature sterilization.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10a Open type cooling tower 10b Sealed type cooling tower 10c Opening / sealing combined type cooling tower 11 Sprinkling device 12 Fan 13 Water tank 13a Cooling water 15 Water heat exchanger 16 Condenser 17 Capacity control type capacity compressor 18 Evaporator 19 Transmission Thermal coil 20 Refrigeration chiller 21 Chilled water tank 22 Load 23 Circulation path 23a Pre-stage cooling section 23b Rear-stage cooling section

Claims (4)

A hermetic cooling tower comprising a heat transfer coil, a watering device that circulates and distributes water to the coil, and a blower fan that brings air into contact with the coil surface;
A condenser cooled by cooling water formed by refluxing the heat transfer coil, a compressor connected to the condenser, an refrigeration chiller including an expansion valve, an evaporator, and the like;
A cooling apparatus characterized in that a return flow path of cooling drainage discharged from a load passes through a heat transfer coil of the hermetic cooling tower and then recirculates through the evaporator of the refrigeration chiller. The compressor according to claim 1 Symbol placement of the cooling device is characterized in that a configuration consisting of capacity control type volume compressor. In a method for recycling and recovering waste water for process cooling having a plurality of cooling loads with different temperatures,
Cooling in the return flow path of the cooling drainage discharged from the process load is performed by multiple stages of cooling,
The first stage cooling is performed directly by a cooling heat source formed through a cooling tower,
The latter stage cooling is performed by indirect cooling with a refrigeration chiller equipped with a condenser cooled by the cold heat source, to meet the required temperature of the load,
While the outside air temperature is low, stop the indirect cooling by the refrigeration chiller ,
Further, the cooling tower uses a hermetic cooling tower that indirectly contacts the cooling waste water and the condenser cooling water with air, and forms cooling before the cooling waste water by cooling through the indirect contact. together it is, the indirect contact with the resulting cooling water by drainage characteristics and to pulp process cooling that so as to form a subsequent cooling by cooling by latent heat of vaporization of the refrigeration chiller having a condenser which is cooled Recovery method. 4. The process cooling wastewater according to claim 3, wherein the compressor of the refrigeration chiller is configured to perform continuous output control in response to fluctuations in the outside air temperature by using a capacity control type volumetric compressor. Collection method.

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