JP5132091B2 - Plate type fresh water generator - Google Patents

Description

  The present invention relates to a plate type water freshener, and more particularly to a plate type water freshener that evaporates raw seawater and condenses steam using a plate heat exchanger.

  As a conventional plate-type fresh water generator, for example, a configuration disclosed in Patent Document 1 is known. As shown in FIG. 7, this plate-type fresh water generator is configured to heat and evaporate the raw material seawater introduced from the raw material water inlet 53 with hot water used for cooling the marine engine and the like and discharge it from the raw material outlet 54. A heater 50 that evaporates droplets contained in the water vapor discharged from the heater 50, and water vapor introduced from the evaporator 60 via the steam inlet 73 is condensed with cooled seawater to be distilled water. And a condenser 70 for discharging the water from the distilled water discharge port 74.

The heater 50 and the condenser 70 are both plate-type heat exchangers, and are configured such that heat exchange is performed between the high-temperature fluid and the low-temperature fluid that flow between the plurality of stacked heat transfer plates. In the condenser 70, a part of the cooled seawater heated and discharged by heat exchange with the steam is introduced from the raw water inlet 53 of the heater 50 as raw seawater.
JP-A-9-299927

  However, since the conventional plate-type water freshener described above has insufficient heat exchange efficiency between the raw seawater introduced into the heater 50 and the hot water, a large heat transfer area is required as a result. Inviting an increase in size.

  Then, an object of this invention is to provide the plate-type fresh water generator which can achieve size reduction and cost reduction by performing the heating temperature rising of raw material seawater efficiently.

  The plate type water freshener according to the first invention for achieving the above object includes a heater for heating raw seawater with hot water to generate water vapor, and cooling the generated water vapor with cooling water to produce distilled water. A condenser for generating, the heater includes a plurality of heat transfer plates stacked between two end plates, and heats the raw seawater and hot water alternately passing between adjacent heat transfer plates. The condenser includes a plurality of heat transfer plates stacked between two end plates, and heat exchange is performed by alternately passing steam and cooling water between adjacent heat transfer plates. A plate-type fresh water generator configured to perform heating with a part of the cooling water discharged from the condenser and to be introduced into the heater as raw seawater. To do.

  In addition, the plate type water freshener according to the second invention for achieving the above object includes a heater for heating raw seawater with warm water to generate water vapor, and cooling the generated water vapor with cooling water for distillation. A condenser for generating water, and the heater includes a plurality of heat transfer plates stacked between two end plates, and alternately passes raw seawater and hot water between adjacent heat transfer plates. The condenser is provided with a plurality of heat transfer plates stacked between two end plates, and alternately passes steam and cooling water between adjacent heat transfer plates. A plate type water freshener configured to exchange heat, wherein the condenser introduces cooling water from one of the end plates, and passes through a part of the plurality of stacked heat transfer plates. Performs heat exchange with water vapor and cools after heat exchange. A part of the water is discharged from one of the end plates, and the remaining cooling water is further heat-exchanged with water vapor through the remaining heat transfer plate to be discharged from the other end plate. The cooling water discharged from is introduced into the heater as raw seawater.

  The plate type water freshener according to the third aspect of the invention for achieving the above object includes a heater for heating raw seawater with warm water to generate water vapor, and cooling the generated water vapor with cooling water for distillation. A condenser for generating water, and the heater includes a plurality of heat transfer plates stacked between two end plates, and alternately passes raw seawater and hot water between adjacent heat transfer plates. The condenser is provided with a plurality of heat transfer plates stacked between two end plates, and alternately passes steam and cooling water between adjacent heat transfer plates. A plate type fresh water generator configured to perform heat exchange, wherein the heater introduces raw seawater from one of the end plates, and hot water is passed through a part of the plurality of stacked heat transfer plates. Heat exchange with the Wherein the seawater to further heat exchange with the hot water through the heat transfer plate of the remainder are configured to discharge from the other of said end plate.

  In the plate-type fresh water generator according to the third aspect of the invention, the condenser introduces cooling water from one of the end plates, and with steam through a part of the plurality of stacked heat transfer plates. Heat exchange is performed, and a part of the cooling water after the heat exchange is discharged from one of the end plates, and the remaining cooling water is further exchanged with water vapor through the remaining heat transfer plate, and the other end. The cooling water discharged from the plate and discharged from the other end plate can be introduced into the heater as raw seawater.

  According to the plate type fresh water generator of the present invention, it is possible to reduce the size and cost by efficiently heating the raw seawater.

Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a schematic configuration diagram of a plate-type fresh water generator according to a first embodiment of the present invention. As shown in FIG. 1, this plate-type fresh water generator 1 a is composed of a heater 10 that heats raw seawater to generate steam, an evaporator 20 that separates steam / brine (concentrated seawater), and cools steam. And a condenser 30 that generates distilled water, and is particularly preferably used as a marine desalination apparatus.

  The heater 10 includes a raw water inlet 11 and a steam / brine outlet 12 through which raw seawater is introduced and discharged, and a hot water inlet 13 and a hot water outlet through which hot water such as jacket cooling water for a marine engine is introduced and discharged, respectively. 14, the raw material seawater introduced from the raw water inlet 11 is heated and evaporated by the hot water introduced from the hot water inlet 13 and is discharged from the steam / brine outlet 12.

  The evaporator 20 includes a heated raw water inlet 21 for introducing the heated raw seawater discharged from the water vapor / brine outlet 12, a vapor outlet 22 for discharging water vapor generated from the raw seawater, and the remaining brine. And a brine discharge port 23 for discharging.

  The condenser 30 includes a steam inlet 31 for introducing the steam discharged from the steam outlet 22, a distilled water outlet 32 for discharging distilled water obtained by cooling the steam, and a steam for cooling the steam. A cooling water inlet 33 and a cooling water outlet 34 for introducing and discharging the cooling water are provided. Cooling seawater is introduced into the cooling water inlet 33 as cooling water by the operation of the ejector pump 35, and part of the seawater discharged from the cooling water outlet 34 is used as driving water for the water ejector 36. A part is led to the raw water inlet 11 of the heater 10 and used as raw seawater, and the rest is discharged out of the ship. Distilled water discharged from the distilled water discharge port 32 is guided to a fresh water tank (not shown) by a distilled water pump 37. The vacuum of the evaporator 20 and the condenser 30 is maintained by being connected to the maximum negative pressure part of the water ejector 36 and sucking non-condensable gas.

  The heater 10 and the condenser 30 are provided with a plate-type heat exchanger, and the configuration thereof is the same as that of a conventional plate-type fresh water generator. As shown in the perspective view of the main part in FIG. 2, the heater 10 is configured such that a plurality of two types of heat transfer plates 103 a and 103 b are alternately stacked between two end plates 101 and 102. The edges are coupled by connecting rods 10a and 10a. Each of the heat transfer plates 103a and 103b is formed in a rectangular shape, and two raw water flow ports 104 and 105 that form flow paths for raw seawater and steam are arranged at one diagonal, and the flow path for hot water is Two hot water circulation ports 106 and 107 to be formed are arranged on the other diagonal.

  The raw water inlet 11, the steam / brine outlet 12, the hot water inlet 13, and the hot water outlet 14 are all provided in one end plate 101, and the raw water circulation port 104 in the plurality of heat transfer plates 103a and 103b. , A flow path formed by the raw water circulation port 105, a flow path formed by the hot water circulation port 106, and a flow path formed by the hot water circulation port 107, respectively.

  Each of the heat transfer plates 103a and 103b is formed with grooves 108a and 108b on one surface, and the groove 108a of the heat transfer plate 103a communicates between the two raw water flow ports 104 and 105, while two The hot water circulation ports 106 and 107 are isolated, and the groove 108b of the heat transfer plate 103b isolates the two raw water circulation ports 104 and 105, while the two hot water circulation ports 106 and 107 communicate with each other. Adjacent heat transfer plates 103a and 103b are sealed with a gasket (not shown). In FIG. 2, for easy understanding, the flow path formed in the stacking direction of the heat transfer plates 103a and 103b is indicated by a broken line in a portion communicating with the grooves 108a and 108b, and is isolated from the grooves 108a and 108b. The part that is shown is shown by a solid line.

  With such a configuration of the heater 10, the raw material seawater and the hot water introduced from the raw water inlet 11 and the hot water inlet 13 flow through the groove 108a of the heat transfer plate 103a and the groove 108b of the heat transfer plate 103b, respectively. When viewed in the stacking direction of the heat transfer plates 103a and 103b, the raw seawater and the hot water alternately pass between the adjacent heat transfer plates 103a and 103b. As a result, heat exchange is performed between the raw seawater and the hot water via the heat transfer plates 103a and 103b. The raw seawater and hot water that have undergone heat exchange are discharged from the steam / brine outlet 12 and the hot water outlet 14, respectively.

  The condenser 30 also has the same configuration as that of the heater 10, and a plurality of two types of heat transfer plates 113 a and 113 b are alternately stacked between the two end plates 111 and 112. The edges are joined by connecting rods 30a and 30a. Each of the heat transfer plates 113a and 113b is formed in a rectangular shape, and two distillation flow ports 114 and 115 that form a flow path of steam (or distilled water) are arranged at one diagonal, and the flow of the cooling water Two cooling water flow ports 116 and 117 forming a path are arranged on the other diagonal.

  The steam inlet 31, the distilled water outlet 32, the cooling water inlet 33, and the cooling water outlet 34 are all provided in one end plate 111, and the distillation flow ports 114 in the plurality of heat transfer plates 113a and 113b. Are connected to the flow path formed by the distillation flow port 115, the flow path formed by the cooling water flow port 116, and the flow channel formed by the cooling water flow port 117, respectively. .

  Each of the heat transfer plates 113a and 113b has grooves 118a and 118b formed on one surface, and the groove 118a of the heat transfer plate 113a communicates the two distillation flow ports 114 and 115 with each other, while The water circulation ports 116 and 117 are isolated, and the groove 118b of the heat transfer plate 113b isolates the two raw water circulation ports 114 and 115, while the two hot water circulation ports 116 and 117 communicate with each other. Adjacent heat transfer plates 113a and 113b are sealed with a gasket (not shown). In FIG. 2, for easy understanding, the flow path formed in the stacking direction of the heat transfer plates 113 a and 113 b indicates a portion communicating with the groove portions 118 a and 118 b by a broken line and is isolated from the groove portions 118 a and 118 b. The part that is shown is shown by a solid line.

  With such a configuration of the condenser 30, the steam and the cooling water introduced from the steam inlet 31 and the cooling water inlet 33 flow through the groove 118a of the heat transfer plate 113a and the groove 118b of the heat transfer plate 113b, respectively. When viewed in the stacking direction of the heat transfer plates 113a and 113b, water vapor and cooling water alternately pass between the adjacent heat transfer plates 113a and 113b. As a result, heat exchange is performed between the steam and the cooling water via the heat transfer plates 113a and 113b. Distilled water and cooling water generated after the heat exchange are discharged from the distilled water discharge port 32 and the cooling water discharge port 34, respectively.

  The cooling water discharged from the cooling water discharge port 34 is heated by heat exchange with water vapor, and a part thereof is introduced into the heater 10 as raw seawater. This configuration is the same as that of the conventional plate-type water freshener, but when this cooling water is directly introduced into the heater 10 as raw seawater, the temperature of the raw seawater is not sufficiently raised and is necessary for evaporation. In order to raise the temperature, a large heat transfer area is required in the heater 10. The present inventors have clarified that this is because the flow rate of the raw material seawater between the heat transfer plates 103a is very slow and a good heat transfer coefficient cannot be obtained.

  Therefore, in the present embodiment, a preheating device is provided in order to increase the temperature of the raw material seawater introduced into the heater 10 to near the evaporation temperature. Specifically, as shown in FIG. 1, a heat exchanger 40 is disposed between the cooling water discharge port 34 and the raw water inlet 11, and jacket cooling water introduced into the hot water inlet 13 of the heater 10. By using a part of hot water as a heat source for the heat exchanger 40, the temperature of the raw seawater passing through the heat exchanger 40 can be efficiently increased to a desired temperature.

  According to the plate type fresh water generator 1a of the present embodiment, a part of the cooling water discharged from the condenser 30 is heated in the heat exchanger 40 and then introduced into the heater 10 as raw seawater. The raw material seawater flowing along the heat transfer plate 103a of the heater 10 evaporates at an early stage, and heat exchange with the hot water flowing along the heat transfer plate 103b can be performed at high speed. Therefore, since the heat transfer coefficient in the heater 10 can be increased, the heater 10 can be reduced in size and cost.

Although the structure of the heat exchanger 40 is not specifically limited, For example, it can be set as a plate-type heat exchanger. Since the plate-type heat exchanger can easily adjust the number of plates, it is easy to control the preheating temperature of the raw seawater, and the flow rate of the fluid can be increased, so that the heat exchange efficiency can be increased. In addition, there is an effect that the blockage of the flow path is difficult to occur.
(Second Embodiment)
FIG. 3 is a schematic configuration diagram of a plate-type fresh water generator according to a second embodiment of the present invention, and FIG. 4 is a perspective view of a main part of the condenser. The plate-type fresh water generator 1b of this embodiment is the same as the plate-type water freshener 1a of the first embodiment except that a heat exchanger 40 is provided instead of the condenser 30 and a raw water seawater preheating part is provided. is there. 3 and 4, the same components as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 4, the condenser 39 of this embodiment is provided with a partition plate 39a between two adjacent heat transfer plates 113a and 113b. Similar to the heat transfer plates 113a and 113b, the partition plate 39a includes distillation flow ports 114 and 115 and a cooling water flow port 116, but does not include a cooling water flow port 117 through which the introduced cooling water passes. The other end plate 112 is connected to the cooling water inlet port 33 through the cooling water circulation ports 116 and 117 of the heat transfer plates 113a and 113b and the cooling water circulation port 116 of the partition plate 39a. An outlet 341 is formed.

  In the condenser 39 having such a configuration, the cooling seawater introduced from the one end plate 111 via the cooling water inlet 33 is separated from water vapor via a part of the laminated heat transfer plates 113a and 113b. Then, a part of the cooling seawater after the heat exchange is discharged from the one end plate 111 through the cooling water discharge port 34. The remaining portion of the cooled seawater after the heat exchange is again exchanged with water vapor through the remaining portions of the stacked heat transfer plates 113a and 113b, and is discharged from the raw seawater discharge port 341 in the other end plate 112. The cooled seawater discharged from the raw seawater discharge port 341 is introduced into the raw water inlet 11 of the heater 10 as shown in FIG.

  The condenser 39 in the plate-type water generator 1b of the present embodiment is configured such that the cooling seawater discharged from the raw seawater discharge port 341 performs heat exchange with water vapor, and then the partition plate 39a and the other end plate 112 Since the water is further exchanged with water vapor, the temperature becomes higher than that of the cooling seawater discharged from the condenser 30 shown in FIG. That is, the condenser 39 of the present embodiment constitutes a preheating portion 41 that preheats raw seawater introduced into the heater 10 between the partition plate 39a and the other end plate 112. The same effect as the form can be achieved.

  The temperature and flow rate of the cooling seawater discharged from the raw seawater discharge port 341 can be easily adjusted by appropriately selecting the insertion position of the partition plate 39a between the heat transfer plates 113a and 113b stacked in large numbers. That is, as the insertion position of the partition plate 39a moves from the other end plate 112 side to the one end plate 111 side, the temperature of the raw seawater discharged from the raw seawater discharge port 341 increases, and the heat recovery rate increases. Become.

  In the present embodiment, only one partition plate 39a is provided. However, when a large number of heat transfer plates 113a and 113b exist between the partition plate 39a and the other end plate 112, a partition plate is further provided. By providing, it is also possible to configure so that heat exchange with water vapor is further repeated.

  In addition, the means for forming the cooling water flow path described above is not necessarily limited to the configuration in which the partition plate 39a is provided. For example, the cooling water circulation port 117 of the heat transfer plate 113a or 113b is closed. Other configurations, such as providing a plug to be used, may be used.

  The condenser 39 of the present embodiment can be configured to include the preheating unit 41 by making a small improvement to the existing condenser, so that further downsizing can be achieved, and the installation space for the heat exchanger can be reduced. This is especially effective when there are constraints.

Moreover, since the preheating part 41 is a plate type heat exchanger, the same effect as the case where the heat exchanger 40 in 1st Embodiment is a plate type can be acquired. In particular, the effect that it is difficult to cause blockage of the flow path is remarkable when the condenser 39 includes the preheating portion 41 as in the present embodiment.
(Third embodiment)
FIG. 5 is a schematic configuration diagram of a plate-type fresh water generator according to a third embodiment of the present invention, and FIG. 6 is a perspective view of a main part of the heater. The plate-type fresh water generator 1c of this embodiment is a plate-type fresh water generator 1a of the first embodiment in which a heater 10 is provided with a preheating portion of raw seawater instead of providing the heat exchanger 40. . 5 and 6, the same components as those of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 6, the heater 19 of the present embodiment includes a partition plate 19a between two adjacent heat transfer plates 103a and 103b. Like the heat transfer plates 103a and 103b, the partition plate 19a includes the raw water circulation port 104 and the hot water circulation ports 106 and 107, but does not include the raw water circulation port 105 through which the introduced raw seawater passes. The raw water introduction port 11 is not provided in one end plate 101 but is provided in the other end plate 102. The raw water introduction port 11 is a raw material water circulation port 104 of the heat transfer plates 103a and 103b. , 105 and the raw material water circulation port 104 of the partition plate 19a communicate with the steam / brine outlet 12.

  In the heater 19 having such a configuration, the raw seawater introduced from the other end plate 102 via the raw water inlet 11 is exchanged with warm water via a part of the stacked heat transfer plates 103a and 103b. Heat exchange is performed, and the raw material seawater portion after the heat exchange is further subjected to heat exchange via the remaining heat transfer plates 103a and 103b, and is discharged from one end plate 111 via the steam / brine outlet 12.

  In the heater 19 in the plate-type fresh water generator 1c of the present embodiment, the raw seawater introduced from the other end plate 102 exchanges heat with warm water between the partition plate 19a and the other end plate 102. Then, since it is comprised so that heat exchange may be performed further with warm water, between the partition plate 19a and the other end plate 102 comprises the preheating part 42 which preheats raw material seawater. Therefore, the plate type fresh water generator 1c of this embodiment can also have the same effects as those of the first embodiment.

  The temperature of the raw seawater passing through the raw water circulation port 104 of the partition plate 19a can be easily adjusted by appropriately selecting the insertion position of the partition plate 19a between the stacked heat transfer plates 103a and 103b. . That is, as the insertion position of the partition plate 19a moves from the other end plate 102 side to the one end plate 101 side, the temperature of the raw seawater that passes through the raw water circulation port 104 of the partition plate 19a increases.

  In the present embodiment, only one partition plate 19a is provided. However, when a large number of heat transfer plates 103a and 103b exist between the partition plate 19a and the other end plate 102, a partition plate is further provided. By providing, it is also possible to configure so that heat exchange with water vapor is further repeated.

  In addition, the means for forming the raw material seawater flow path described above is not necessarily limited to the configuration in which the partition plate 19a is provided. For example, the raw water circulation port 105 of the heat transfer plate 103a or 103b is closed. Other configurations, such as providing a plug to be used, may be used.

  Since the heater 19 of the present embodiment can be configured to include the preheating unit 42 by making a small improvement to the existing heater, further downsizing can be achieved and the installation space of the heat exchanger is restricted. In some cases it is particularly effective.

  Moreover, since the preheating part 42 is a plate type heat exchanger, the same effect as the case where the heat exchanger 40 in 1st Embodiment is a plate type can be acquired.

  Moreover, in the plate-type fresh water generator 1c of this embodiment, the configuration of the condenser 30 is changed to the configuration of the condenser 39 in the second embodiment shown in FIG. By configuring the raw seawater discharged from 341 to be introduced into the heater 19, further downsizing and higher efficiency can be achieved.

It is a schematic block diagram of the plate-type fresh water generator which concerns on the 1st Embodiment of this invention. It is a principal part perspective view of the heater and condenser in the plate-type fresh water generator shown in FIG. It is a schematic block diagram of the plate-type fresh water generator which concerns on the 2nd Embodiment of this invention. It is a principal part perspective view of the condenser in the plate-type fresh water generator shown in FIG. It is a schematic block diagram of the plate-type fresh water generator which concerns on the 3rd Embodiment of this invention. It is a principal part perspective view of the heater in the plate type fresh water generator shown in FIG. It is a schematic block diagram of the conventional plate type fresh water generator.

Explanation of symbols

1a, 1b, 1c Plate type fresh water generator 10, 19 Heater 101, 102, 111, 112 End plate 103a, 103b, 113a, 113b Heat transfer plate 19a Partition plate 20 Evaporator 30, 39 Condenser 39a Partition plate 40 Heat exchanger 41, 42 Preheating part

Claims (4)

A heater that heats raw seawater with warm water to generate water vapor;
A condenser for cooling the generated water vapor with cooling water to generate distilled water,
The heater includes a plurality of heat transfer plates stacked between two end plates, and is configured to exchange heat by alternately passing raw seawater and hot water between adjacent heat transfer plates,
The condenser includes a plurality of heat transfer plates stacked between two end plates, and is configured to exchange heat by alternately passing steam and cooling water between adjacent heat transfer plates. A fresh water generator,
The condenser introduces cooling water from one of the end plates, performs heat exchange with water vapor through some of the stacked heat transfer plates, and a part of the cooling water after heat exchange Was discharged from one end plate, and the remaining cooling water was further exchanged with water vapor through the remaining heat transfer plate to be discharged from the other end plate and discharged from the other end plate. A plate type water freshener configured to introduce cooling water into the heater as raw seawater. It is a plate type fresh water generator of Claim 1 ,
The heater introduces raw seawater from one of the end plates, performs heat exchange with warm water through a part of the plurality of stacked heat transfer plates, and uses the raw seawater after heat exchange for the remaining part A plate-type fresh water generator configured to further exchange heat with hot water through a heat transfer plate and to discharge from the other end plate. The condenser includes a partition plate interposed between any two adjacent heat transfer plates,
The partition plate is formed with a cooling water circulation port through which the remaining cooling water passes,
The plate-type structure according to claim 1 or 2, wherein cooling water that has passed through the cooling water circulation port and exchanged heat with water vapor between the partition plate and the other end plate is introduced into the heater. Water equipment. Each of the heat transfer plates has a rectangular shape, and two cooling water circulation ports forming a cooling water flow path are arranged diagonally,
The cooling water circulation port of the partition plate is arranged corresponding to a cooling water circulation port different from the cooling water circulation port through which the introduced cooling water passes, of the two cooling water circulation ports of the heat transfer plate. The plate type fresh water generator according to claim 3.