JP7294103B2 - Fresh water system - Google Patents

Description

The present invention relates to a fresh water generating system mounted on a ship.

Conventionally, a ship is equipped with a fresh water generator that produces fresh water from seawater. For example, in Patent Document 1, an evaporator that heats and evaporates seawater using cooling water of a ship engine as a heat source, a condenser that condenses the steam generated by evaporating seawater in the evaporator to obtain fresh water, An evaporative fresh water generator has been proposed.

JP 2014-18736 A

According to such an evaporative freshwater generator, seawater is heated using exhaust heat generated by a ship's engine to evaporate under reduced pressure, so that fresh water can be produced from seawater with high energy efficiency.
On the other hand, if more fresh water is required, in addition to the evaporation type fresh water generator, a reverse osmosis membrane type fresh water generator equipped with a reverse osmosis membrane module that separates seawater into permeated water (fresh water) and concentrated water is installed. It is also possible.
Here, in the reverse osmosis membrane type fresh water generator, seawater is supplied to the reverse osmosis membrane module at a pressure exceeding the osmotic pressure of seawater to remove salt content. Since pumps that pressurize seawater consume a lot of electricity, ships equipped with evaporation type fresh water generators and reverse osmosis membrane fresh water generators can improve their fresh water generation capacity, but the power consumption related to fresh water generation is increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fresh water generating system capable of improving the fresh water generating capacity and suppressing power consumption related to fresh water generation.

The present invention is an evaporation type including an evaporator that evaporates seawater using cooling water of a ship engine as a heat source, and a condenser that condenses the steam generated by evaporating seawater in the evaporator to generate fresh water. A desalination system mounted on a ship for use with a desalination device, comprising: a reverse osmosis membrane type desalination device comprising a reverse osmosis membrane module for separating seawater as feed water into permeated water and concentrated water; and the condensing section. Between a concentrated seawater discharge line that discharges concentrated seawater concentrated in the above, a water supply line that supplies seawater to the reverse osmosis membrane module, and between the concentrated seawater that flows through the concentrated seawater discharge line and the seawater that flows through the water supply line. and a heat exchanger that exchanges heat in the fresh water generation system.

Further, the fresh water generation system includes a bypass line connected to the concentrated seawater discharge line and bypassing the heat exchanger, and a flow path of the concentrated seawater flowing through the concentrated seawater discharge line, which is connected to the heat exchanger or the bypass line. It is preferable to further include a switching valve for switching to .

The fresh water generation system preferably further includes an operation control unit for switching between a normal operation mode in which concentrated seawater is discharged through the bypass line and a heated water supply operation mode in which concentrated seawater is discharged through the heat exchanger.

The desalination system further includes a temperature measuring unit that measures the temperature of seawater on the secondary side of the heat exchanger in the water supply line, and a set temperature in which the temperature of the seawater measured by the temperature measuring unit is set in advance. It is preferable to further include a notification unit that performs notification when exceeding.

Further, the reverse osmosis membrane type fresh water generator includes a first reverse osmosis membrane module and a second reverse osmosis membrane module connected to the secondary side of the first reverse osmosis membrane module, A first fresh water tank for storing permeated water that has passed through the osmosis membrane module, permeated water that has passed through the first reverse osmosis membrane module and the second reverse osmosis membrane module, and fresh water generated in the evaporation type fresh water generator. It is preferable to further include a second fresh water tank that stores the .

According to the fresh water generating system of the present invention, it is possible to improve the fresh water generating capacity and to suppress power consumption related to fresh water generation.

1 is a diagram showing the configuration of a composite fresh water generating system including a fresh water generating system according to one embodiment of the present invention; FIG.

A preferred embodiment of the present invention will be described below with reference to the drawings. The fresh water generating system 1 of this embodiment is mounted on a ship and constitutes a composite fresh water generating system 100 together with an evaporative fresh water generator 90 .
The composite fresh water generating system 100 includes an evaporation fresh water generator 90 and a fresh water generating system 1 including a reverse osmosis membrane fresh water generator 10, and produces fresh water from seawater.

The evaporative fresh water generator 90 heats and evaporates seawater using the cooling water of the ship's engine as a heat source, and condenses the generated steam to produce fresh water. The evaporative fresh water generator 90 includes an evaporator 91, a cooling water line 92 passing through the evaporator 91 and through which cooling water for the ship's engine flows, a condenser 93, a first seawater line 94 passing through the condenser 93, A concentrated seawater discharge line 95 , a first seawater supply line 96 that supplies seawater to the evaporator 91 , and an evaporation-side fresh water line 97 are provided.

The evaporator 91 boils the seawater supplied from the first seawater supply line 96 by the heat of the engine cooling water flowing through the cooling water line 92 to generate steam.
Condensing section 93 is arranged above evaporating section 91 . The steam generated in the evaporating section 91 is introduced into the condensing section 93 together with boiled non-evaporated seawater. In the condensation section 93, a separator (not shown) disposed inside separates steam from unevaporated seawater, and then the separated steam is cooled by seawater flowing through the first seawater line 94. It condenses and this produces fresh water.

The upstream and downstream sides of the first seawater line 94 are open to the outside of the ship. Heat is exchanged with the introduced steam. Seawater heated by heat exchange with steam in the evaporator 91 is discharged overboard. A water supply pump 941 that supplies seawater to the condensation section 93 is arranged in the first seawater line 94 .

The concentrated seawater discharge line 95 is connected to the evaporator 91 on the upstream side, and the seawater separated in the evaporator 91 circulates as concentrated seawater. The downstream side of the concentrated seawater discharge line 95 is discharged overboard after passing through a heat exchanger 40 and the like, which will be described later. An ejector 951 , a driving seawater supply line 952 as a driving fluid supply line, and an ejector pump 953 are arranged or connected to the concentrated seawater discharge line 95 .

The ejector 951 is arranged downstream of the heat exchanger 40 described later in the concentrated seawater discharge line 95 . The drive seawater supply line 952 is connected to the ejector 951 and supplies seawater as a drive fluid to the ejector 951 . The ejector pump 953 is arranged in the drive seawater supply line 952 and sends seawater taken in from outside the ship toward the ejector 951 .
According to the concentrated seawater discharge line 95 described above, the concentrated seawater flowing through the concentrated seawater discharge line 95 is sucked by the flow of seawater serving as the drive fluid supplied to the ejector 951 through the drive seawater supply line 952 and discharged overboard. be done. In addition, by sucking the concentrated seawater flowing through the concentrated seawater discharge line 95, the pressure inside the concentrated seawater discharge line 95, the condensing section 93, and the evaporating section 91 is reduced to a pressure lower than the saturation temperature of seawater, specifically -0. 09 MPa or less.

The first seawater supply line 96 is connected downstream of the condensation section 93 in the first seawater line 94 on the upstream side, and connected to the lower portion of the evaporation section 91 on the downstream side. The first seawater supply line 96 supplies part of the seawater, which is taken from outside the ship and heated in the condensation section 93 , to the evaporation section 91 .

The evaporation-side fresh water line 97 is connected to the condensation section 93 on the upstream side and allows the fresh water generated in the condensation section 93 to flow therethrough. The downstream side of the evaporation-side fresh water line 97 is connected to the second fresh water tank 72, which will be described later. An on-off valve 971 is arranged in the evaporation-side fresh water line 97 .

Next, the fresh water generation system 1 will be described. The desalination system 1 includes a reverse osmosis membrane type desalination apparatus 10, a reverse osmosis membrane side fresh water line 15, the above-described concentrated seawater discharge line 95, a second seawater supply line 20 as a water supply line, and a second seawater supply. A filtering device 30 arranged in the line 20 , a heat exchanger 40 , a bypass line 50 , a switching valve 60 , a fresh water tank 70 and a control device 80 are provided.

The reverse osmosis membrane type fresh water generator 10 includes reverse osmosis membrane modules 11 and 12 , a reverse osmosis membrane side fresh water line 15 , and a concentrated water discharge line 16 .
The reverse osmosis membrane modules 11 and 12 remove ions (sodium ions, chloride ions, heavy metal ions, sulfate ions, etc.), colloids, bacteria, mutagenic substances, organic chlorine compounds, etc. from seawater as supply water, Seawater is separated into clear water as permeated water and concentrated water. In this embodiment, the reverse osmosis membrane type fresh water generator 10 includes two reverse osmosis membrane modules 11 and 2 , a first reverse osmosis membrane module 11 and a second reverse osmosis membrane module 12 connected downstream of the first reverse osmosis membrane module 11 . It comprises a permeable membrane module.

The reverse osmosis membrane side fresh water line 15 is connected to the reverse osmosis membrane fresh water generator 10 on the upstream side, and circulates fresh water separated from seawater in the reverse osmosis membrane fresh water generator 10 . In this embodiment, the reverse osmosis membrane-side clean water line 15 includes a first line 151 connecting the first reverse osmosis membrane module 11 and the second reverse osmosis membrane module 12, and a second line 152 branching from the first line 151. and a third line 153 whose upstream side is connected to the second reverse osmosis membrane module 12 .

The first line 151 supplies fresh water produced in the first reverse osmosis membrane module 11 to the second reverse osmosis membrane module 12 . A three-way valve 154 is arranged on the first line 151 to adjust the flow rate of fresh water flowing through the second line 152 and fresh water flowing through the second reverse osmosis membrane module. Three-way valve 154 can also be replaced with two two-way valves.
The second line 152 circulates part of the fresh water generated in the first reverse osmosis membrane module 11 circulating through the first line 151 . The downstream side of the second line 152 is connected to a fresh water tank 70 (first fresh water tank 71), which will be described later. A regulating valve 163 for adjusting the concentration line pressure of the first reverse osmosis membrane module is arranged in the first concentrated water discharge line 161 , and the flow rate of fresh water flowing through the first line 151 is adjusted by adjusting the concentration line pressure.

The third line 153 circulates fresh water produced in the second reverse osmosis membrane module 12 . The downstream side of the third line 153 is connected to the fresh water tank 70 (second fresh water tank 72). A control valve 164 for adjusting the concentration line pressure of the second reverse osmosis membrane module is arranged in the second concentrated water discharge line 162 , and the flow rate of fresh water flowing through the third line 153 is adjusted by adjusting the concentration line pressure.

Here, since the fresh water that has passed through the first reverse osmosis membrane module 11 is supplied to the second reverse osmosis membrane module 12, the fresh water that has passed through the second reverse osmosis membrane module 12 becomes pure water with few impurities. .

A concentrated water discharge line 16 discharges the concentrated water separated in the reverse osmosis membrane module. In this embodiment, the concentrated water discharge line 16 includes a first concentrated water discharge line 161 for discharging the concentrated water separated in the first reverse osmosis membrane module 11 and a concentrated water separated in the second reverse osmosis membrane module 12. and a second concentrated water discharge line 162 for discharging the

The second seawater supply line 20 supplies seawater to the reverse osmosis membrane type fresh water generator 10 . The upstream side of the second seawater supply line 20 is open to a line through which seawater taken from outside the ship flows, and the downstream side is connected to the first reverse osmosis membrane module 11 . A water supply pump 21 for supplying seawater to the first reverse osmosis membrane module 11 , a temperature sensor 22 as a temperature measuring unit, and a pressure pump 23 are arranged in the second seawater supply line 20 . The temperature sensor 22 is arranged in the vicinity of the connecting portion of the second seawater supply line 20 with the reverse osmosis membrane fresh water generator 10 (on the second seawater supply line 20 downstream of a heat exchanger 40 described later). The temperature sensor 22 measures the temperature of seawater flowing through the second seawater supply line 20 . The boost pump 23 is arranged downstream of the temperature sensor 22 . The booster pump 23 boosts the pressure of seawater flowing through the second seawater supply line 20 and supplies the seawater to the reverse osmosis membrane type fresh water generator 10 .

The filtering device 30 is arranged in the second seawater supply line 20 and removes foreign matter such as suspended matter and plankton contained in the seawater flowing through the second seawater supply line 20 .

The heat exchanger 40 contains concentrated seawater (40° C. to 60° C. ) for heat exchange. Here, the seawater supplied to the reverse osmosis membrane type fresh water generator 10 is heated to 25° C. to 35° C. and supplied to the reverse osmosis membrane type fresh water generator 10, thereby increasing the amount of fresh water generated. can.
The heat exchanger 40 is between the filtration device 30 and the reverse osmosis membrane type fresh water generator 10 in the second seawater supply line 20, and is connected to the evaporation type fresh water generator 90 and the concentrated seawater discharge line 95. is placed between Since the heat exchanger is arranged on the suction side of the ejector 951, the increase in pressure loss in the concentrated seawater discharge line due to the heat exchanger is preferably 0.01 MPa or less.

Bypass line 50 is connected to concentrated seawater discharge line 95 and bypasses heat exchanger 40 .
The switching valve 60 switches the flow path of the concentrated seawater flowing through the concentrated seawater discharge line 95 to the heat exchanger 40 or the bypass line 50 . In the present embodiment, the switching valves 60 include a first switching valve 61 arranged downstream of the connection with the bypass line 50 in the concentrated seawater discharge line 95, and a second switching valve 62 arranged in the bypass line 50. and When switching the flow path of the concentrated seawater to the heat exchanger 40 side, the first switching valve 61 is opened and the second switching valve 62 is closed. Moreover, when switching the flow path of the concentrated seawater to the bypass line 50 side, the first switching valve 61 is closed and the second switching valve 62 is opened.

The fresh water tank 70 stores fresh water produced in the evaporation fresh water generator 90 and fresh water produced in the reverse osmosis membrane fresh water generator 10 . In this embodiment, the fresh water tank 70 includes two tanks, a first fresh water tank 71 and a second fresh water tank 72 .
The fresh water that permeates the first reverse osmosis membrane module 11 is stored in the first fresh water tank 71 .

The second fresh water tank 72 stores fresh water produced in the evaporative fresh water generator 90 and fresh water having fewer impurities than the fresh water that has passed through the second reverse osmosis membrane module 12 . More specifically, an evaporation-side fresh water line 97 is connected to the second fresh water tank 72 . Further, the downstream side of the third line 153 of the reverse osmosis membrane side fresh water line 15 that permeates the second reverse osmosis membrane module 12 is connected to the second fresh water tank 72 .

The fresh water stored in the second fresh water tank 72 is pure water with fewer impurities than the fresh water stored in the first fresh water tank 71 . The fresh water produced by the evaporation type fresh water generator 90 has a purity equal to or higher than that of the fresh water that has passed through the second reverse osmosis membrane module 12 .

The control device 80 is composed of a microprocessor (not shown) including a CPU and memory. In the control device 80, the CPU of the microprocessor executes various controls related to the combined fresh water generation system 100 according to a predetermined program read from the memory. Specifically, the control device 80 controls the operations of the fresh water generation system 1 and the evaporative fresh water generator 90 by controlling the operation of various pumps and the opening and closing of various valves that constitute the composite fresh water generation system 100 .

The control device 80 operates the evaporation type fresh water generator 90 and the reverse osmosis membrane type fresh water generator 10 while the engine of the ship is running. Here, the desalination system 1 performs heat exchange between the reverse osmosis membrane type desalination device 10, the concentrated seawater flowing through the concentrated seawater discharge line 95, and the seawater flowing through the second seawater supply line 20. a vessel 40; As a result, the seawater supplied to the reverse osmosis membrane type fresh water generator 10 can be heated by the concentrated seawater discharged from the evaporation type fresh water generator 90, so that the fresh water generation capacity of the reverse osmosis membrane type fresh water generator 10 can be improved. be done. Therefore, the fresh water generation efficiency of the fresh water generation system 1 mounted on the ship can be improved. In addition, since the temperature of the concentrated seawater discharged overboard can be lowered, the impact on the environment can be reduced.

In this embodiment, the control device 80 includes an operation control unit 81 that switches the fresh water generation system 1 between the normal operation mode and the heated water supply operation mode, and a notification unit 82 that performs notification under predetermined conditions. .
The normal operation mode is a mode in which the concentrated seawater discharged from the condensation unit 93 of the evaporative fresh water generator 90 and flowing through the concentrated seawater discharge line 95 is discharged overboard through the bypass line 50 without passing through the heat exchanger 40. Yes, according to this normal operation mode, the seawater supplied to the reverse osmosis membrane type fresh water generator 10 is not heated.

The heated water supply operation mode is a mode in which the concentrated seawater discharged from the condensation unit 93 of the evaporative fresh water generator 90 and flowing through the concentrated seawater discharge line 95 is discharged overboard through the heat exchanger 40. According to the water supply operation mode, the reverse osmosis membrane type fresh water generator 10 is supplied with heated seawater.

The operation control unit 81 switches between the normal operation mode and the heated water supply operation mode by switching between the opening and closing of the first switching valve 61 and the second switching valve 62 . The operation control unit 81 can switch the operation mode according to, for example, an input operation mode switching instruction. Further, when the temperature of the seawater flowing through the second seawater supply line 20, which is measured by the temperature sensor 22, exceeds a preset temperature, the operation control unit 81 changes the operation mode from the heated water supply operation mode. You may switch to normal operation mode. As a result, the operation mode can be switched from the heated water supply operation mode to the normal operation mode, for example, when the ship is sailing in a sea area where the seawater temperature is high. Therefore, it is possible to prevent the temperature of the seawater supplied to the reverse osmosis membrane type fresh water generator 10 from becoming too high, so that the reverse osmosis membrane modules 11 and 12 can be used under appropriate temperature conditions.
That is, when the temperature of the engine cooling water of a ship fluctuates depending on the engine load and reaches a high temperature (for example, a normal temperature of 90° C.), and the engine cooling water is used as a non-heating fluid to heat the feed water of the reverse osmosis membrane type fresh water generator 10, The feed water temperature may exceed the heat resistance temperature (for example, 45° C.) of the reverse osmosis membrane. On the other hand, the evaporation type fresh water generator 90 is a device that evaporates seawater in a decompressed state. ) is the upper limit, there is little risk of exceeding the heat resistant temperature of the reverse osmosis membrane. Therefore, according to this embodiment, the temperature condition of the engine cooling water and the temperature condition of the concentrated seawater discharged from the evaporative fresh water generator 90 can be effectively used to improve the fresh water generation capacity and the fresh water generation efficiency. It is possible to realize a desalination system that can be made.

The notification unit 82 notifies by an alarm or the like when the control device 80 detects a predetermined condition. The notification unit 82 notifies, for example, when the temperature of the seawater flowing through the second seawater supply line 20 measured by the temperature sensor 22 exceeds a preset temperature. As a result, for example, when the ship is navigating in a sea area with a high seawater temperature, it is notified that the temperature of the seawater supplied to the reverse osmosis membrane type fresh water generator 10 may become too high. be informed.

In addition, the control device 80 controls the opening and closing of the on-off valves 971 and 972 of the fresh water line 97 on the evaporation side and the degree of opening of the three-way valve 154 of the fresh water line 15 on the reverse osmosis membrane side. The amount of fresh water stored in the tank 72 is controlled.

According to the fresh water generation system 1 of this embodiment described above, the following effects are obtained.

(1) The desalination system 1 mounted on the ship is heated between the reverse osmosis membrane type desalination device 10, the concentrated seawater flowing through the concentrated seawater discharge line 95, and the seawater flowing through the second seawater supply line 20. and a heat exchanger 40 for exchanging. As a result, the seawater supplied to the reverse osmosis membrane type fresh water generator 10 can be heated by the concentrated seawater discharged from the evaporation type fresh water generator 90, so that the fresh water generation capacity of the reverse osmosis membrane type fresh water generator 10 can be improved. be done. Therefore, it is possible to improve the fresh water generation efficiency of the fresh water generation system 1 mounted on the ship while suppressing the power consumption related to fresh water generation. In addition, since the temperature of the concentrated seawater discharged overboard can be lowered, the impact on the environment can be reduced.

(2) The desalination system 1 is configured to include a bypass line 50 that bypasses the heat exchanger 40 . As a result, the concentrated seawater can be discharged through the bypass line 50 when the engine of the ship is stopped (when no concentrated seawater is generated), etc., so that unheated seawater can be prevented from flowing into the heat exchanger 40. . Therefore, the risk of contamination of the inside of the heat exchanger 40 with microorganisms can be reduced. Further, by circulating the concentrated seawater through the bypass line 50, the heat exchanger 40 can be cleaned and maintained when the reverse osmosis membrane type fresh water generator 10 is not used. Furthermore, the evaporation type fresh water generator 90 and the reverse osmosis membrane type fresh water generator 10 can be used independently.

(3) The fresh water generation system 1 is configured to include an operation control unit 81 that switches between the normal operation mode and the heated water supply operation mode. As a result, the operation mode can be switched to the heated water supply operation mode or the normal operation mode according to various conditions such as the operating condition of the ship (engine) and the condition of the seawater. Therefore, the desalination system 1 can be operated according to the state of the ship.

(4) The desalination system 1 includes a temperature sensor 22 for measuring the temperature of seawater on the downstream side of the heat exchanger 40 in the second seawater supply line 20, and and a notification unit 82 that performs notification when the value is exceeded. As a result, for example, when the water temperature in the sea area where the ship navigates is high, when the temperature of the seawater on the downstream side of the heat exchanger 40 rises to the extent that it affects the reverse osmosis membrane modules 11 and 12, it is notified A notification is made by the unit 82 . Therefore, when the notification by the notification unit 82 is performed, the operation mode is switched from the heated water supply operation mode to the normal operation mode, or the operation of the reverse osmosis membrane type fresh water generator 10 is stopped. It is possible to prevent high temperature seawater from being supplied to the membrane type fresh water generator 10 .

(5) The reverse osmosis membrane type fresh water generator 10 is configured to include a first reverse osmosis membrane module 11 and a second reverse osmosis membrane module 12, and the fresh water generation system 1 permeates the first reverse osmosis membrane module 11. It includes a first fresh water tank 71 that stores permeated water and a second fresh water tank 72 that stores permeated water that has passed through the second reverse osmosis membrane module 12 . As a result, two types of fresh water with different purities can be respectively stored. For example, by using the fresh water stored in the first fresh water tank 71 for applications that can be handled with fresh water of low purity, fresh water with high purity can be stored. Avoid over-producing. In other words, the water in the first clean water tank 71 is used for cleaning applications where even water containing some impurities is sufficient, and the water in the second clean water tank 72 is used for applications that require pure water with few impurities. can save a lot of water. Therefore, the energy efficiency of the fresh water generation system 1 can be improved.

A preferred embodiment of the fresh water generation system 1 of the present invention has been described above, but the present invention is not limited to the above-described embodiment and can be modified as appropriate.
For example, in the present embodiment, the switching valve 60 includes a first switching valve 61 arranged downstream of the connection with the bypass line 50 in the concentrated seawater discharge line 95, and a second switching valve 61 arranged in the bypass line 50. Although it is configured by the valve 62, it is not limited to this. That is, the switching valve may be configured by a three-way valve arranged at the connecting portion between the concentrated seawater discharge line 95 and the bypass line 50 .

Further, in the present embodiment, the boost pump 23 is arranged between the heat exchanger 40 and the reverse osmosis membrane fresh water generator 10 in the second seawater supply line 20, but the present invention is not limited to this. That is, in addition to the booster pump 23, a booster pump may be arranged between the first reverse osmosis membrane module 11 and the second reverse osmosis membrane module 12 (that is, upstream of the second reverse osmosis membrane module 12). .

In the present embodiment, the operation control unit 81 is caused to switch between the normal operation mode and the heated water supply operation mode by switching between the opening and closing of the first switching valve 61 and the second switching valve 62. Not exclusively. That is, instead of the first switching valve and the second switching valve, a three-way valve is arranged at the branch portion of the concentrated seawater discharge line and the bypass line, and the operation control unit switches the flow path of the three-way valve to the normal operation mode. and heated water supply operation mode. Further, in this case, in the heated water supply mode, by adjusting the opening degree of the three-way valve, the flow rate of the concentrated seawater supplied to the heat exchanger is adjusted, and the seawater flowing through the second seawater supply line is heated. may be adjusted. This allows the reverse osmosis membrane module to be used under more appropriate temperature conditions.

1 Fresh Water Generation System 10 Reverse Osmosis Membrane Fresh Water Generator 11 First Reverse Osmosis Membrane Module (Reverse Osmosis Membrane Module)
12 Second reverse osmosis membrane module (reverse osmosis membrane module)
20 Second seawater supply line (water supply line)
22 temperature sensor (temperature measurement unit)
40 Heat Exchanger 50 Bypass Line 60 Switching Valve 71 First Fresh Water Tank 72 Second Fresh Water Tank 81 Operation Control Unit 82 Reporting Unit 90 Evaporative Fresh Water Generator 91 Evaporating Unit 93 Condensing Unit 95 Concentrated Seawater Discharge Line

Claims (5)

an evaporator that evaporates seawater using the engine cooling water of the ship as a heat source;
A fresh water generating system mounted on a ship and used with an evaporative fresh water generator comprising a condensing section for condensing steam generated by evaporating seawater in the evaporating section to generate fresh water,
a reverse osmosis membrane type fresh water generator equipped with a reverse osmosis membrane module for separating seawater as feed water into permeated water and concentrated water;
a concentrated seawater discharge line for discharging concentrated seawater concentrated in the condensation section;
a water supply line for supplying seawater to the reverse osmosis membrane module;
A desalination system comprising a heat exchanger that exchanges heat between concentrated seawater flowing through the concentrated seawater discharge line and seawater flowing through the water supply line. a bypass line connected to the concentrated seawater discharge line and bypassing the heat exchanger;
2. The fresh water generation system according to claim 1, further comprising a switching valve for switching a flow path of concentrated seawater flowing through said concentrated seawater discharge line to said heat exchanger or said bypass line. a normal operation mode in which concentrated seawater is discharged through the bypass line;
3. The fresh water generation system according to claim 2, further comprising an operation control unit for switching between a heated water supply operation mode for discharging concentrated seawater through the heat exchanger. a temperature measuring unit that measures the temperature of seawater on the downstream side of the heat exchanger in the water supply line;
The desalination system according to any one of claims 1 to 3, further comprising a notification unit that notifies when the seawater temperature measured by the temperature measurement unit exceeds a preset set temperature. The reverse osmosis membrane type fresh water generator includes a first reverse osmosis membrane module and a second reverse osmosis membrane module connected downstream of the first reverse osmosis membrane module,
a first fresh water tank for storing permeated water that has passed through the first reverse osmosis membrane module;
The apparatus according to any one of claims 1 to 4, further comprising a second fresh water tank for storing permeated water that has passed through said first reverse osmosis membrane module and said second reverse osmosis membrane module and fresh water generated in said evaporation type fresh water generator. The fresh water generation system according to any one of the above.

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