JP2001047034A - Freezing separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce wastewater treatment costs. SOLUTION: A downflow liquid film type ice storage tank 4 and a wastewater tank 2 which collects wastewater from a wastewater supply soured and stores it, recycling water tank 3 are provided. During the operation of freezing separation, wastewater stored in the tank 2 is supplied to the ice storage tank 4 and stored as ice in the ice storage tank 4. During the operation of recycling water production, instead of the supply of wastewater from the tank 2 to the ice storage tank 4, ice stored in a cooling coil 4C is melted, and the water is supplied to the tank 3. Instead of ice accretion in the coil 4C by the operation of freezing separation, concentrated wastewater left in the tank 2 is discharged from the tank 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a freeze separation apparatus.

[0002]

2. Description of the Related Art For example, as shown in FIG.
02 is supplied to the steam turbine 103,
The steam turbine 103 is driven to rotate, the rotation driving force is transmitted to a generator 104 to generate power, and the steam used in the steam turbine 103 is supplied to the condenser 6, where it is supplied from the condensing cooling tower 105. In the steam turbine boiler 102 and the cooling tower 10 in the power generation system 100 using a steam turbine, the condensed water is returned to the steam boiler 102 through the return water tank 107 and used again for generating steam.
5 discharges blow water.

Conventionally, wastewater such as blow water has been outsourced to a wastewater treatment specialist.

[0004]

However, when the wastewater treatment is outsourced to a wastewater treatment specialist, there is a problem that the wastewater treatment cost increases.

[0005] Therefore, a main object of the present invention is to reduce the cost of wastewater treatment.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cooling coil in which a refrigerant for ice making passes in a heat storage tank.
A water sprinkler is provided above the cooling coil, a water storage portion is provided below the cooling coil, and a water surface of the water storage portion is configured to be separated and maintained below the cooling coil,
A falling film ice heat storage device, a wastewater tank for collecting and storing wastewater from a wastewater supply source, and a reuse water tank, and during the freeze separation operation, the wastewater stored in the wastewater tank is used as the wastewater tank. Continuously circulates between the falling liquid film type ice thermal storage device and the circulating wastewater from the water sprayer in the falling liquid film type ice thermal storage device, and distributes the scattered water to the surface of the cooling coil or the cooling coil. The surface of the ice adhering to the surface is caused to flow down in a liquid film form, and in the flow-down process, substantially only a part of the pure water in the flow-down wastewater is removed from the ice adhering to the surface of the cooling coil or the cooling coil. While the surface is iced, the remaining condensate is taken into the flowing wastewater flowing down through the icing site and washed away, and the wastewater that has reached the reservoir is returned to the wastewater tank, and the recycled water is used. During the production operation, the wastewater tank Without performing wastewater supply to the sprinkler and returning wastewater from the water storage unit to the wastewater tank, the ice stored in the cooling coil is thawed and the thawed water is supplied to the reuse water tank. A freeze separation device characterized by the following.

In the present invention, the falling film ice heat storage device includes a plurality of heat storage tanks, performs the freeze separation operation using at least one heat storage tank, and performs the remaining heat storage tanks in parallel with the operation. It is preferable that the recycle water production operation is performed using at least one of the above.

[0008] In addition, at least two wastewater tanks are provided, and wastewater from the wastewater supply source is selectively supplied to the wastewater tanks, and the freeze separation operation and the reuse water production operation are performed. Configured to alternate,
It is also preferable to switch the wastewater tank that collects the wastewater during each freeze separation operation, and to supply the stored wastewater of the wastewater tank that does not collect wastewater to the heat storage tank during each freeze separation operation. .

[0009] In addition, at least two wastewater tanks are provided, and wastewater from the wastewater supply source is selectively supplied to the wastewater tanks. A plurality of heat storage tanks are provided, and the freeze separation operation is performed using at least one heat storage tank, and the reuse water production operation is performed using at least one of the remaining heat storage tanks in parallel with the operation. In addition, wastewater from the wastewater supply source is collected and stored only in one of the wastewater tanks, and the stored wastewater collected in the other wastewater tank is stored in the heat storage tank during the freeze separation operation. When the storage amount in one of the wastewater tanks reaches a predetermined amount, the collection of wastewater from the wastewater supply source into the one wastewater tank is stopped, and the other wastewater tank is stopped. Collect in aquarium With switching to cormorants it is also preferred to constitute the reservoir wastewater of the one waste water tank as make stored as ice is supplied to the heat storage tank during freezing separation operation.

<Operation> The apparatus of the present invention separates wastewater into fresh water and concentrated wastewater by the freezing / separating action of the ice heat storage device, and defrosts the ice stored in the ice heat storage device to obtain reusable clear water. This makes it possible to reduce wastewater treatment costs and reuse most of the water.

In particular, when icing the cooling coil, only a part of the pure moisture of the flowing wastewater becomes ice and adheres to the surface of the cooling coil or the surface of the ice adhering to the coil. As a result, the remainder is concentrated wastewater (concentrated water). Min), and separation by freeze concentration is performed. The remaining concentrate is successively taken into the wastewater flowing down through the icing site by the continuous circulation of the wastewater and washed away. Therefore, it is difficult for impurities contained in the concentrated portion to stay at one place at a high concentration, so that the impurities are hardly taken into the produced ice, and the icing efficiency is high (the icing is easy). And as a result, 90% or more of the wastewater can be stored as pure ice. On the other hand, according to the so-called immersion-tube type ice heat storage device that performs ice making while the cooling coil is immersed in the storage water, pure ice can be reduced to only about 50%. On the other hand, the flowing wastewater that has reached the water storage section is concentrated only by pure water that has landed on the cooling coil, and is returned to the wastewater tank to be mixed with the stored wastewater. It is continuously circulated to the sprinkler of the heat storage device. Therefore, the circulating wastewater is concentrated over time by the freeze concentration effect.

Further, the falling film ice heat storage device has a high deicing efficiency, and the temperature of the deicing cold water does not substantially rise until the ice disappears. There is also an advantage that it can be suitably used as a refrigerant in the above equipment.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. <Basic Embodiment> FIG. 1 shows a first embodiment of a freeze separation apparatus to which the present invention is applied. This freeze separation apparatus 1 includes a plurality of cooling coils 4C through which ice-making refrigerant flows from a refrigerator 4F and a heat storage tank 4T. And a plurality of sprinklers 4S are provided corresponding to above each cooling coil 4C, a water storage section 4W is provided below the cooling coil 4C, and a water surface of the water storage section 4W is separated below the cooling coil 4C. A falling liquid film type ice heat storage device 4 configured to maintain (not shown, but falls above the storage water surface and below the cooling coil 4C in the falling liquid film type ice heat storage device 4 when the ice is released from the cooling coil 4C during thaw. And a wastewater tank 2 for collecting and storing wastewater supplied from a wastewater supply source, and a reuse water tank 3 for storing manufactured reused water.

The waste water tank 2 is connected to a sprinkler 4S of a falling film ice regenerator 4 via a waste water supply path 2A, and the waste water supply path 2A is provided with a waste water supply pump 2B and a waste water supply valve 2C. It is arranged. On the other hand, heat storage tank 4
The water storage section 4W of T is provided with a water pump 4P and a wastewater return path 2
D and a recycle water tank 3 via a water supply pump 4P and a recycle water supply path 3D, respectively, and a waste water return valve 2E is connected to the waste water return path 2D.
However, a reuse water supply valve 3E is provided in the reuse water supply passage 3D. A discharge passage 2F communicates with the wastewater tank 2, and a discharge valve 2G is disposed in the discharge passage 2F.

On the other hand, in the illustrated example, a recycle water tank 3 is connected to a sprinkler 4S of a falling liquid film type ice heat storage device 4, and a recycle water circulation pump 3B and a recycle water circulation valve 3C are connected to a recycle water circulation path 3A. Are disposed in this order, and a reuse water delivery path 3F is connected to the outlet side of the reuse water circulation pump 3B in the reuse water circulation path 3A, and a reuse water delivery valve is connected to the reuse water delivery path 3F. 3G is provided.

At the time of the freeze separation operation, as shown in FIG. 2, the refrigerating machine 4F, with the recycle water circulation valve 3C and recycle water supply valve 3E closed and the recycle water supply valve 2C and the recycle water return valve 2E opened. Wastewater supply pump 2
B and the water pump 4P are operated. Thereby, the wastewater stored in the wastewater tank 2 is supplied to the sprinkler 4S via the wastewater supply path 2A, and is sprayed from the sprinkler 4S into the heat storage tank 4T. The sprayed wastewater flows down in a liquid film form over the surface of the cooling coil 4C or the surface of the ice C attached to the cooling coil 4C, and the flowing wastewater is cooled during the flowing process, and only a part of the pure water of the flowing wastewater is cooled. Accumulates on the surface of the cooling coil 4C or the surface of the ice C attached to the cooling coil, and the remainder becomes concentrated wastewater (concentrated component). As a result, the water is separated by freeze concentration into a concentrated component. The remaining concentrate is successively taken into the wastewater flowing down through the icing site by the continuous circulation of the wastewater and washed away. The wastewater that has flowed down while fetching the concentrated component and has reached the water storage section 4W is returned to the wastewater tank 2 via the wastewater return path 2D and mixed with the stored wastewater, and then the mixed wastewater is continuously returned to the sprinkler 4S again. Circulated to In the continuous wastewater circulation between the wastewater tank 2 and the heat storage tank 4T, substantially only water in the wastewater becomes ice and is stored in the cooling coil 4C, and impurities continue to circulate without being taken into the ice storage. As the concentration of impurities in the wastewater increases with time, pure water is separated from the wastewater as ice.

Characteristically, as described above, the surface of the cooling coil adhering ice C always flows down so that the wastewater licks, and the concentrated component is taken in and washed, so that the impurities contained in the concentrated component remain in one place at a high concentration. As a result, impurities are less likely to be taken into the produced ice, and the ice making efficiency is increased. As a result, 90% or more of the wastewater can be stored as ice substantially consisting only of pure water.

When the freeze separation is completed, as shown in FIG. 3, the refrigerator 4F and the wastewater supply pump 2B are stopped, and the wastewater supply valve 2C and the wastewater return valve 2E are stopped.
Is closed and the discharge valve 2G is opened to discharge the concentrated wastewater remaining in the wastewater tank 2 through the discharge path 2F.
When the discharge is completed, the discharge valve 2G is closed. In addition,
The discharge of the concentrated wastewater may be performed during the reuse water production operation described below.

Subsequently, at least the reuse water supply valve 3
E is opened, and the reuse water circulation pump 3B is operated to start the reuse water production operation. In the present invention, simply the heat storage tank 4 is used.
The ice stored in T is thawed naturally or by passing a heating medium through an ice-making coil, and the ice is thawed.
It can be supplied to the reuse water tank 3 via D and supplied to the reuse destination from this reuse water tank 3 as needed, but since the reuse water is stored as ice, it is better to use the stored heat effectively. preferable.

Therefore, for example, as shown in FIG.
With the refrigerator 4F and the wastewater supply pump 2B stopped, and the wastewater supply valve 2C, the wastewater return valve 2E, and the reused water delivery valve 3G closed, the reused water supply valve 3E is closed.
By opening the reuse water circulation valve 3C and operating the water supply pump 4P and the reuse water circulation pump 3B, the reuse water production operation is started, and the fresh water is reused in the reuse water tank 3, the reuse circulation path 3A, and the heat storage tank 4T. Circulate in the order of the reuse water tank 3. If there is no fresh water in the water storage section 4W of the heat storage tank 4T or in the reusable water tank 3 at the time of startup, it can be started after supplying fresh water to these.

The circulating fresh water is sprayed from the water sprayer 4S in the heat storage tank 4T and flows down in a liquid film form over the surface of each corresponding cooling coil 4C or the surface of the ice adhering to the cooling coil. The flowing water is cooled by the ice attached to the cooling coil (including ice dropped into the water storage unit 4W) C, reaches the water storage unit 4W together with the defrosted water at that time, and is supplied to the reuse water tank 3 via the reuse water supply passage 3D. . The cold water stored in the reuse water tank 3 is sent to a cold water utilization device or equipment 5 such as an air-conditioning load to give cold heat, and after being heated, is supplied again to the heat storage tank 4T, cooled again, and reused. 3
Return to

Further, when the ice stored in the heat storage tank 4T is exhausted, the production of cold water can no longer be performed. At this point, the recycle water circulation valve 3C is closed, and the recycle water delivery valve 3 is closed.
G is opened, and the water is supplied to a reuse destination such as a toilet through the reuse water delivery path 3F.

Thus, wastewater treatment costs can be reduced, most of the water can be reused, and the heat stored as ice during the freeze separation can be effectively used.

When wastewater (boiler wastewater or the like) is continuously generated throughout the day as in the above-described power generation system, it is necessary to continuously receive at least the wastewater, but such reception is not suitable for the apparatus of the present basic embodiment. is there. Therefore, it is recommended to employ the first and second application modes described below.

<First Application Mode> As shown in FIG. 5, a freeze separation apparatus 10 according to a first application mode increases the number of wastewater tanks to two as compared with the above-described basic mode, and supplies a wastewater supply source. Waste water from the first and second waste water tanks 20 and 21 can be selectively replenished, and the waste water stored in each of the waste water tanks 20 and 21 can be selectively supplied to a falling film ice. The heat storage device 4 can be supplied to each of them. Other configurations are the same as the above-described basic form,
The same reference numerals are used to abbreviate the description.

In the illustrated example, the first and second wastewater supply paths 20J and 21J are respectively connected to the wastewater tanks 20 and 21, and the first and second wastewater supply paths 20J and 21J are respectively connected to the first and second wastewater supply paths 20J and 21J.
And the second wastewater replenishment valves 20K and 21K, respectively, so that the wastewater from the wastewater supply source can be first and second wastewater supply sources.
Only one of the wastewater tanks 20 and 21 can be selectively supplied.

The first wastewater tank 20 is connected to the first wastewater supply passage 2.
0A, the second wastewater tank 21 is connected to the second wastewater supply passage 21A.
Are connected to the wastewater supply path 2A via the, and communicate with the water sprayer 4S of the ice heat storage device 4, and the first wastewater supply path 20A is provided with a first wastewater supply valve 20C,
By disposing the second wastewater supply valve 21C in the second wastewater supply passage 21A, the wastewater stored in each of the wastewater tanks 20, 21 can be selectively supplied to the falling liquid film ice heat storage device 4 respectively. I am doing so. On the other hand, the water storage section 4W of the heat storage tank 4T
Are connected to the first wastewater tank 20 via the water pump 4P and the wastewater return path 2D, further to the first wastewater tank 20 via the first wastewater return path 20D, and to the second wastewater tank 21 via the second wastewater return path 21D, respectively. I have.

Further, in each of the wastewater tanks 20 and 21, the first
The first and second discharge valves 20G and 21G are respectively disposed in the discharge paths 20F and 21F.

Under such an apparatus configuration, the freeze separation operation and the reuse water production operation are performed alternately, and wastewater is discharged between each freeze separation operation (after one freeze separation operation is completed and before the next freeze separation operation is started). The wastewater tank to be collected is switched, and during each freeze separation operation, the wastewater stored in the wastewater tank that does not collect wastewater is supplied to the heat storage tank, so that the wastewater can be continuously received.

Hereinafter, this specific example will be described in detail. For example, it is assumed that ice is now stored in the heat storage tank 4T, and the reused water production operation is being performed using the ice.
From the freeze separation operation before the reuse water production operation, the first wastewater supply valve 20K is opened, the second wastewater supply valve 21K is closed, and wastewater from the wastewater supply source is collected and stored only in the first wastewater tank 20. Shall be

After the recycle water production operation is completed, when the next freeze separation operation is started, the first wastewater supply valve 20K is closed and the second wastewater supply valve 21K is opened to discharge wastewater from the wastewater supply source into the first wastewater supply source. The collection in the water tank 20 is stopped, and the collection is switched to the collection in the second wastewater tank 21. The first wastewater supply valve 20C, the wastewater supply valve 2C, the wastewater return valve 2
0E is opened, the recycle water circulation valve 3C and the recycle water supply valve 3E are closed, and the wastewater supply pump 2B and the water supply pump 4P are operated to discharge the wastewater stored in the first wastewater tank 20 into the ice heat storage device 4. The water is supplied to the sprinkler 4S to perform the freeze separation operation. The wastewater supplied to the heat storage tank 4T is cooled and iced in the process of flowing down the surface of the cooling coil 4C. The wastewater that has reached the water storage section 4W without icing on the cooling coil 4C is returned to the first wastewater tank 20 by the water supply pump 4P. When the freeze separation operation is completed, the heat storage tank 4T
While ice is stored in the inside, concentrated wastewater remains in the first wastewater tank 20.

Subsequently, the first discharge valve 20G is opened, and the concentrated wastewater remaining in the first wastewater tank 20 is discharged to the first discharge passage 20F.
Let out through. Also, the first wastewater supply valve 20C
And the wastewater supply valve 2C is closed, and the recycled water circulation valve 3C and the recycled water supply valve 3E are opened,
The water supply pump 4P and the recycle water circulation pump 3B are operated to start a recycle water production operation. In the reuse water production operation, the defrosted fresh water (cold water) in the heat storage tank 4T is circulated in the order of the reuse water tank 3, the reuse circulation path 3A, the heat storage tank 4T, and the reuse water tank 3. The circulating fresh water continuously cools the air-conditioning load 5 while being cooled each time it passes through the heat storage tank 4T. If the ice stored in the heat storage tank 4T runs out, cold water can no longer be produced.
C is closed, the reuse water delivery valve 3G is opened, and the water is supplied to a reuse destination such as a toilet through the reuse water delivery path 3F. On the other hand, the second wastewater tank 21 continuously collects and stores wastewater from the wastewater supply source even during the reuse water operation.

Next, when the recycle water production operation is completed, the recycle water circulation valve 3C and the recycle water supply valve 3E are closed, the recycle water circulation pump 3B is stopped, and the next freeze separation operation is started. This time, the first wastewater supply valve 20K is opened and the second wastewater supply valve 21K is closed to stop collecting wastewater from the wastewater supply source into the second wastewater tank 21 and collect the wastewater into the first wastewater tank 20. At the same time, the second wastewater supply valve 21C and the wastewater supply valve 2C are opened, and the wastewater stored in the second wastewater tank 21 is supplied to the sprinkler 4S of the ice heat storage device 4 to perform the freeze separation operation. When the freeze separation operation is completed, ice is stored in the heat storage tank 4T, while concentrated wastewater remains in the second wastewater tank 21.

Then, the second discharge valve 21G is subsequently opened to discharge the concentrated wastewater remaining in the second wastewater tank 21 through the second discharge path 21F, and the stored wastewater in the second wastewater tank 21 is used. The ice stored by the freeze separation operation is thawed, and a reuse water production operation is started. The first wastewater tank 20 continuously collects and stores the wastewater from the wastewater supply source during the reuse water operation.

Thereafter, by repeating such a process, one of the wastewater tanks can always be used for receiving the wastewater, so that the wastewater can be continuously received. Further, according to the first embodiment, for example, a refrigerator or a pump is operated by using relatively cheap nighttime electric power at night to perform a freeze separation operation, and during the daytime, a recycled water production operation is performed and the water is produced. Cold water can also be used in air conditioners and the like. FIG. 6 shows a specific time flow of such an operation mode.
It was shown to. The flow in the figure shows that the first and second wastewater tanks are 1
This shows an example in which daily wastewater can be stored. The wastewater tank that collects wastewater is switched at 10 o'clock every day, and the wastewater tank that does not collect wastewater starts freezing and separating from 10 o'clock at night. And the wastewater stored in the previous wastewater collection is supplied to the ice thermal storage device. In addition, in the time zone from 8:00 am to 10:00 am at night, which is described as the operation for producing recycled water, Nothing is done other than discharging the concentrated water. Although not shown, it is also possible to perform the nighttime freeze separation operation and perform the reuse water production operation only for a predetermined time in the daytime, for example, three hours from 1:00 pm to 4:00 pm when the air conditioning load increases.

On the other hand, in the first application form, since there is only one ice heat storage device, the freeze separation of the wastewater and the production of the reused water cannot be performed simultaneously. Therefore, continuous production of reused water is impossible. Therefore, a second application mode in which the freeze separation of wastewater and the production of reused water can be performed in parallel is also proposed.

<Second Application Mode> As shown in FIG. 7, the freeze separation device 30 according to the second application mode includes two wastewater tanks as well as the first , 21 are configured to selectively supply wastewater from a wastewater supply source, and are also provided with two heat storage tanks. The storage wastewater in the first or second wastewater tanks 20, 21 is
The first and second heat storage tanks 24T and 34T can be selectively supplied to one of the first and second heat storage tanks 24T and 34T, and the water stored in the first and second heat storage tanks 24T and 34T is a first or second wastewater tank. 20, 21 or the reusable water tank 3 can be selectively supplied. The same components as those in the above-described basic mode or the first applied mode are designated by the same reference numerals, and description thereof is omitted.

In the present apparatus 30, the water storage section 24W of the first heat storage tank 24T extends to the first wastewater tank 20 via the first wastewater return passage 22D and the wastewater return pump 24P, and further via the first wastewater return passage 20D. The second through the second wastewater return path 21D
While each is connected to the wastewater tank 21, it is connected to the reuse water tank 3 via the first reused water supply channel 23 </ b> D and the reused water supply channel 3 </ b> D, and the first wastewater supply passage 22 </ b> D is connected to the first wastewater A water supply valve 22E is provided, and a first reused water supply valve 23E is provided in the first reused water supply passage 23D.

Similarly, the water storage section 34W of the second heat storage tank 34T
Is a second wastewater transmission passage 32D and a wastewater return pump 24P.
To the first wastewater tank 20 via the first wastewater return path 20D and to the second wastewater tank 2 via the second wastewater return path 21D.
1 while being connected to the second recycle water conduit 3
It is connected to the reuse water tank 3 via the 3D and the reuse water supply path 3D, and the second waste water supply valve 32E is disposed in the second waste water supply path 32D, and the second reuse water supply path 33D.
Is provided with a second reused water supply valve 33E.

The first wastewater tank 20 is connected to the sprinkler 24S of the first heat storage tank 24T via the first wastewater supply passage 20A and the wastewater supply passage 2A, and further via the first wastewater receiving passage 22A. The second heat storage tank 34T is connected to the sprinkler 34S via the second wastewater receiving passage 32A. On the other hand, the second wastewater tank 21 is connected to the first wastewater supply passage 21A and the wastewater supply passage 2A, and further through the first wastewater reception passage 22A.
Connected to the sprinkler 24S of the heat storage tank 24T and the second
Sprinkler 3 in second heat storage tank 34T via waste water receiving passage 32A
4S. A wastewater supply pump 2B is provided in the wastewater supply passage 2A, a first wastewater reception valve 24X is provided in the first wastewater reception passage 22A, and a second wastewater reception is provided in the second wastewater reception passage 32A. A valve 34X is provided. Thus, the wastewater stored in each of the wastewater tanks 20 and 21 can be selectively supplied to the first or second heat storage tank.

Further, the reuse water tank 3 is used for the reuse water circulation path 3.
A through the first recycle water circulation path 23A.
Connected to the sprinkler 24S of the heat storage tank 24T and the second
It is connected to the sprinkler 34S of the second heat storage tank 34T via the reused water circulation path 33A, and is connected to the first reused water circulation path 23A.
Is provided with a first recycled water circulation valve 23C, and a second recycled water circulation path 33A is provided with a second recycled water circulation valve 33C.
Are arranged.

On the other hand, although the present apparatus 30 is provided with two heat storage tanks, as both will not be used simultaneously in the freezing / separating operation as described later, only one refrigerator 4F will be used. The cooling coil 24C of the first heat storage tank 24T and the cooling coil 34C of the second heat storage tank 34T
Is configured to be selectively supplied to any one of them. However, a refrigerator can be provided for each heat storage tank.

Thus, it is possible to perform the freezing / separation operation using either one of the heat storage tanks 20 or 21 and, at the same time, perform the reuse water production operation using the other heat storage tank 20 or 21. become able to.

Further, wastewater from a wastewater supply source is collected and stored in only one of the wastewater tanks 2 # 0 or 21, and the stored wastewater collected in the other wastewater tank 20 or 21 is separated by freezing. When ice is supplied to the heat storage tank 24T or 34T during operation and stored as ice, and the storage amount of one of the wastewater tanks 20 or 21 becomes a predetermined amount,
The wastewater from the wastewater source is supplied to one of the wastewater tanks 20 or 2
Stop collecting to 1 and the other wastewater tank 21 or 20
To the wastewater tank 2
Thermal storage tank 2 during freezing and separation operation of 0 or 21 stored wastewater
By supplying 4T or 34T and storing it as ice, it is possible to continuously receive wastewater.
Hereinafter, a specific driving mode will be described in detail based on a time flow example shown in FIG.先 ず First, each of the heat storage tanks 24T and 34T alternately performs the reuse water production operation and the freeze separation operation. In addition, equalize each reuse water production operation time, and equalize each freeze separation operation time, and each reuse water production operation time is the time required for one cycle of reuse water production and freeze separation operation of the heat storage tank. The time is obtained by dividing by the total number. Therefore, each freeze separation operation time of each heat storage tank is obtained by subtracting the reuse water production operation time from the time required for one cycle. Therefore, in the case of the illustrated example, the ice heat storage device 24 has two heat storage tanks 24T and 34T.
Assuming that the time required for one cycle of 34T reuse water production and freeze separation operation is 2 hours, each reuse water production operation time and each freeze separation operation time of each heat storage tank is 1 hour. Although not shown, for example, when the time required for one cycle with three heat storage tanks is 1 hour and 30 minutes, each operation time of producing reuse water in each heat storage tank is 30 minutes, and each freezing and freezing time of each heat storage tank is The operation time is one hour.

The operation time of each of the heat storage tanks 20 and 21 is shifted so that only one of the heat storage tanks performs the reuse water production operation, and the other heat storage tanks perform the freeze separation operation at that time. Shall be Further, each of the wastewater tanks 20 and 21 can store the amount of wastewater for the freeze separation operation time.

(First Stage) Assuming that it is 8:00 am in the time flow of FIG. 8, the first heat storage tank 24T finishes the reuse water production operation, starts the freeze separation operation, and conversely, the second heat storage tank 24T. The tank 34T finishes the freeze separation operation and starts the reuse water production operation. On the other hand, the first wastewater tank 20 completes the wastewater collection and enters the freeze separation operation, while the second wastewater tank 21
After the freeze separation operation with the heat storage tank, wastewater collection will be started.

That is, at this time, the amount of water stored in the first wastewater tank 20 is the amount of wastewater for one hour, so that the first wastewater supply valve 20K and the second wastewater supply valve 21C are closed, and the second wastewater supply valve 21K is closed. Is opened to stop supplying wastewater to the first wastewater tank 20 and switch to supply only the second wastewater tank 21 via the second wastewater supply path 21J.

Also, with the switching of the wastewater collection tank,
First wastewater supply valve 20C, first wastewater receiving valve 24
X, open the first waste water feed valve 22E and the first waste water return valve 20E, close the first reuse water feed valve 23E and the first reuse water circulation valve 23C, and operate the production waste water return pump 24P. In addition, refrigerator 4F
Is also operated to circulate the ice making refrigerant to the cooling coil 24C of the first heat storage tank 24T. This allows
The wastewater stored in the first wastewater tank 20 is supplied to the first wastewater supply passage 20A,
Circulating only between the first drainage tank 20 and the first heat storage tank 24T via the wastewater supply path 2A and the first wastewater receiving path 22A, and the first wastewater water supply path 22D and the first wastewater return path 20D, In the circulation process, the cooling coil 24C cools the first heat storage tank 24T and gradually accumulates on the cooling coil.

On the other hand, since the second heat storage tank 34T stores the ice in the cooling coil 34C prior to the defrosting operation, the second heat storage tank 34T starts the reuse water production operation by using this. That is, the second
Reuse water supply valve 33E, reuse water supply valve 3E,
The second recycle water circulation valve 33C is opened, the second wastewater receiving valve 34X, the second wastewater water supply valve 32E is closed, and the recycle water water supply pump 24Q and the recycle water circulation pump 3B are operated to store water in the second heat storage tank 34T. The defrosted water of the section 34W is sequentially supplied to the reuse water tank 3 via the second reuse water supply passage 33D and the reuse water supply path 3D, and the cold water stored in the reuse water tank is reused by the reuse water circulation path 3D.
A and the second recycle water circuit 3 via the air conditioning load 5
The water is supplied to the sprinkler 34S of the second heat storage tank 34T via 3A, cooled by the ice in the second heat storage tank 34T, and circulated to the reuse water tank 3.

Thus, the first heat storage tank 24T and the first wastewater tank 20 are used for the freeze separation operation, and in parallel with this, the second heat storage tank 34T is used for the recycled water production operation, and the second heat storage tank 34T is used for the second operation. The wastewater tank 21 is used for collecting and storing wastewater.

(Second Stage) After one hour, the amount of water stored in the second wastewater tank 21 is the amount of wastewater equivalent to one hour, so that the second wastewater supply valve 21K and the first wastewater supply valve 21K
Close the wastewater supply valve 20C and the first wastewater supply valve 20K
Is opened, the supply of wastewater to the second wastewater tank 21 is stopped, and the supply is switched to supply only to the first wastewater tank 20.

Further, with the switching of the wastewater collection tank,
Second wastewater supply valve 21C, second wastewater receiving valve 34
X, the second wastewater feed valve 32E and the second wastewater return valve 21E are opened, the second recycled water feed valve 33E and the second recycled water circulation valve 33C are closed, and the production wastewater return pump 24P is operated. In addition, refrigerator 4F
Is supplied to the cooling coil 34 of the second heat storage tank 34T. Thereby, the wastewater stored in the second wastewater tank 21 is transferred to the second wastewater supply passage 21A, the wastewater supply passage 2A and the second wastewater receiving passage 32A, and the second wastewater supply passage 32D and the second wastewater return passage 21D. 2
It circulates only between the waste water tank 21 and the second heat storage tank 34T, and in the circulation process, is cooled by the cooling coil 34C in the second heat storage tank 34T and gradually accumulates on the cooling coil.

On the other hand, since the first heat storage tank 24T stores the ice in the cooling coil 24C prior to the defrosting operation, the first heat storage tank 24T starts the operation for producing the reused water using the ice. That is, the first
Reuse water supply valve 23E, reuse water supply valve 3E,
While opening the reuse water circulation valve 23C and closing the first wastewater receiving valve 24X and the first wastewater feed valve 22E,
Reuse water water supply pump 24Q and reuse water circulation pump 3
B is operated to supply the defrosted water in the water storage portion 24W of the first heat storage tank 24T to the reuse water tank 3 sequentially through the first reuse water supply passage 23D and the reuse water supply passage 3D. Reuse cold water stored in the reuse water tank 3 to reuse water circulation path 3A
And the first recycle water circuit 23 via the air conditioning load 5.
A to the sprinkler 24S of the first heat storage tank 24T via A,
Cooled by the ice in the first heat storage tank 24T, and then circulated to the reuse water tank 3.

Thus, the second heat storage tank 34T and the second wastewater tank 21 are used for the freeze separation operation, and in parallel with this, the first heat storage tank 24T is used for the reuse water production operation, and The wastewater tank 20 is used for collecting and storing wastewater.

(Subsequent stages) Thereafter, the first and second steps will be described.
The steps are repeated as one cycle. Thus, either one of the heat storage tanks performs the freeze separation operation and the other can perform the reuse water production operation at the same time, so that the continuous supply of the reuse water and the continuous reception of the wastewater, that is, the continuous treatment Becomes possible.

<Others> Although not shown, it is preferable to spray fresh water from the sprayer into the heat storage tank during the freeze separation operation or after the freeze separation operation, for example, to wash the surface of the ice stored in the cooling coil. . As a result, the wastewater or the concentrated wastewater attached to the surface of the ice can be washed away, and the reuse water having a lower impurity concentration can be produced.

<Experimental example> Using salt water instead of wastewater, freeze separation experiments were carried out using the apparatus of the present invention employing a falling film type ice heat storage apparatus and an apparatus employing a submerged ice storage apparatus. As a result, the salt concentration in the ice attached to the cooling coil in the apparatus of the present invention was 2/3 of the salt concentration in the ice attached to the cooling coil in the apparatus employing the immersion-type ice heat storage device. From these results, it can be seen that in the apparatus of the present invention, impurities are less likely to be taken into the produced ice by the above-mentioned washing by taking in the concentrated amount by the flowing wastewater, and thereby, a remarkably excellent freeze separation effect is exhibited.

[0058]

As described above, according to the present invention, wastewater can be stored as ice consisting essentially of pure water, and the ice can be reused as a cold heat source or a water source. The cost can be reduced. In addition, impurities are hardly taken into the ice during ice making, and the content of impurities in the ice storage can be significantly reduced, so that the ice melting water can be easily reused, and the amount of ice can be significantly improved. Wastewater reuse efficiency can be significantly increased.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a basic mode of a freeze separation device according to the present invention.

FIG. 2 is a flowchart showing the freeze separation operation state.

FIG. 3 is a flow chart showing the state of the concentrated wastewater.

FIG. 4 is a flowchart showing the state of the reuse water production operation.

FIG. 5 is a flowchart showing a first applied form of the freeze separation device according to the present invention.

FIG. 6 is a time flow chart suitable for the first application mode.

FIG. 7 is a flowchart showing a second applied form of the freeze separation device according to the present invention.

FIG. 8 is a time flow diagram suitable for a second application mode.

FIG. 9 is a flowchart of a power generation system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Freezing separation apparatus, 2 ... Waste water tank, 3 ... Reuse water tank, 4 ...
Falling liquid film ice heat storage device.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Nobuyuki Matsumoto 4-27-23 Meieki Station, Nakamura-ku, Nagoya City, Aichi Prefecture Inside Nippon Air Conditioning Co., Ltd. −182 New Japan Air Conditioning Co., Ltd. (72) Naoki Kuroda, Inventor 7033 in Miyagawa-shi Inokusuji, Chino City, Nagano Prefecture−72−182 New Japan Air Conditioning Co., Ltd. −182 New Japan Air Conditioning Co., Ltd. F-term (reference) 4D037 AA13 BA21 BB01

Claims (4)

[Claims] 1. A cooling coil through which an ice-making refrigerant passes in a heat storage tank, a water sprinkler is provided above the cooling coil, a water storage section is provided below the cooling coil, and a cooling water surface of the water storage section is cooled. It has a falling liquid film type ice thermal storage device that is configured to be separated and maintained below the coil, a wastewater tank that collects and stores wastewater from a wastewater supply source, and a reused water tank. The wastewater stored in the wastewater tank is continuously circulated between the wastewater tank and the falling liquid film ice heat storage device, and the circulated wastewater is sprayed from the water sprayer in the falling liquid film ice heat storage device. Then, the sprayed wastewater is caused to flow down while circulating the surface of the cooling coil or the surface of ice attached to the cooling coil in the form of a liquid film. The cooling coil surface or While the surface of the ice adhering to the return coil is iced, the remaining concentrated portion is taken into the flowing wastewater flowing down through the icing portion and washed away, and the wastewater reaching the water storage section is returned to the wastewater tank. In the operation of producing recycled water, without supplying wastewater from the wastewater tank to the sprinkler and returning wastewater from the water storage unit to the wastewater tank, the ice stored in the cooling coil is thawed. A freeze separation apparatus characterized in that the deicing water is supplied to the reuse water tank. 2. The falling-film ice heat storage device includes a plurality of heat storage tanks, performs the freeze separation operation using at least one heat storage tank, and simultaneously performs at least one of the remaining heat storage tanks. The freeze separation apparatus according to claim 1, wherein the apparatus is configured to perform the recycle water production operation using one of them. 3. A wastewater tank comprising at least two wastewater tanks and selectively supplying wastewater from the wastewater supply source to the wastewater tanks, wherein the freeze separation operation and the reuse water production operation are performed. It is configured to perform alternately, and switches the wastewater tank for collecting the wastewater between each freeze separation operation, and supplies the wastewater stored in the wastewater tank that does not collect wastewater to the heat storage tank during each freeze separation operation. The freeze separation device according to claim 1, wherein the freeze separation device is configured to perform the freeze separation. 4. The apparatus according to claim 1, further comprising: at least two wastewater tanks, wherein the wastewater tank is configured to selectively supply wastewater from the wastewater supply source to the wastewater tanks. A plurality of heat storage tanks are provided, and the freeze separation operation is performed using at least one heat storage tank, and the reuse water production operation is performed using at least one of the remaining heat storage tanks in parallel with the operation. In addition, wastewater from the wastewater supply source is collected and stored only in one of the wastewater tanks, and the stored wastewater collected in the other wastewater tank is stored in the heat storage tank during the freeze separation operation. When the storage amount in one of the wastewater tanks reaches a predetermined amount, the collection of wastewater from the wastewater supply source into the one wastewater tank is stopped, and the other wastewater is collected. To collect in the aquarium It switches with the configured as cause stored as ice is supplied to the heat storage tank during freezing separation driving reservoir wastewater of one waste water tank, freezing separation apparatus according to claim 1.