TWI617342B - Vacuum evaporation water generator - Google Patents

Abstract

The present invention provides a vacuum evaporation type water generating device excellent in thermal efficiency. The vacuum evaporating water generator includes a heater that heats the supplied raw material seawater by heat from a heat source to generate steam; the container body introduces steam generated by the heater; and the pressure reducing mechanism (water The ejector is a person who decompresses the inside of the container; the condenser cools the vapor in the container body by cooling seawater to generate fresh water; and the preheater is self-condensing by the vapor in the container body A part of the seawater for cooling discharged from the apparatus is heated and supplied to the heater as raw material seawater. The inner surface or the outer surface of each heat transfer tube of at least one of the condenser and the preheater is processed by the concavities and convexities.

Description

Vacuum evaporation water generator Field of invention

The present invention relates to a vacuum evaporation type water generating device for producing fresh water from seawater, and more particularly to a vacuum evaporation type water generating device having a preheater.

Background of the invention

Generally, ships operating at sea use steam from boilers carried by ships or waste heat from diesel engines or other machinery as a heat source to evaporate seawater extracted from the sea under high vacuum to produce fresh water, which has been used for this purpose. . In general, the vacuum evaporation type water generator includes a heater that is heated by heat exchange between warm water used for cooling the supplied raw material seawater and a diesel engine, and the like; The container body is maintained in a reduced pressure (vacuum) state by a pressure reducing mechanism, and the generated steam is condensed and desalinated. In the container body, a condenser having a plurality of heat transfer tubes is housed, and is cooled and condensed by heat exchange with cooling seawater flowing through the inside of the heat transfer tubes to be desalinated. Further, a part of the seawater for cooling discharged from the condenser is supplied to the heater as raw material seawater.

The raw material supplied to the heater, the seawater, and the vapor of the condenser The heat exchange, its temperature will become higher, but the evaporation temperature is still relatively low compared to seawater. Therefore, in the vacuum evaporation type water generator of the above configuration, heating/evaporation of the raw material seawater of the heater cannot be efficiently performed. Therefore, there is proposed a vacuum evaporation type water generator (see, for example, Patent Document 1), which is provided with a preheater for supplying cooling water (raw water) discharged from a condenser to a heater after further heating. By.

In the vacuum evaporation type water generator of Patent Document 1, a multi-tube type preheater having the same structure as that of the condenser is provided above the condenser. The seawater for cooling introduced into the heat transfer tube of the preheater from the condenser is further heated by heat exchange with the steam generated in the container body, and is supplied as raw material seawater to the higher temperature state. Heater. As a result, in the vacuum evaporation type water generator of Patent Document 1, it is possible to improve the thermal efficiency of the heater and to reduce the size of the entire apparatus.

Conventional technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. Hei 6-254534

Summary of invention

However, in the vacuum evaporation type water generator of Patent Document 1, in order to improve the thermal efficiency of the heater, the temperature of the seawater supplied to the heater is increased by providing a preheater; However, there is still room for improvement in this point because the heat transfer performance of each of the heat transfer tubes constituting the preheater (or even the condenser) is not particularly discussed.

The present invention has been made in view of the above problems, and an object thereof is to provide a vacuum evaporation type water generator which is excellent in thermal efficiency.

The above object of the present invention is achieved by a vacuum evaporation type water generator which uses fresh heat from a heat source mounted on a ship to produce fresh water from seawater taken into the ship, and the vacuum evaporation The water generator includes a heater that heats the supplied raw material seawater by heat from a heat source to generate steam, and the container body is sealed, and the steam generated by the heater is introduced. The pressure reducing mechanism is a body for decompressing the inside of the container; the condenser has a plurality of heat transfer tubes, and the steam in the container body is cooled by cooling seawater to generate fresh water; and the preheater is a plurality of heat transfer tubes that are heated by a portion of the cooling seawater discharged from the condenser by the vapor in the container body, and supplied to the heater as raw material seawater; and the condenser and the preheater At least one of the heat transfer tubes on the inner surface or the outer surface of the heat transfer tube is processed by a concavo-convex process.

In a preferred embodiment of the present invention, between the condenser and the preheater, an auxiliary pump that boosts a portion of the cooling seawater discharged from the condenser to be supplied to the preheater is provided. .

In a further preferred embodiment of the present invention, there is provided a pump for supplying cooling seawater to the condenser, wherein the pump is used for supplying seawater extracted from the sea to each seawater use vessel of a diesel engine. Sea water pump.

In other preferred embodiments of the present invention, a pump for supplying cooling water to the condenser, wherein the pressure reducing mechanism is a water ejector driven by seawater, and the pump is used to supply a driving seawater to an injection pump of the water ejector, and the water ejector The discharged driving seawater is supplied to the condenser as cooling seawater.

In the vacuum evaporation type water generator of the above embodiment, the heat transfer tube is preferably composed of a corrugated tube. Alternatively, it is preferable that the heat transfer tube is provided with a projection or a groove integrally formed on the inner surface or the outer surface to perform uneven processing.

Further, in another preferred embodiment of the present invention, the pressure reducing mechanism is a water ejector driven by seawater, and further includes an injection pump for supplying driving seawater to the water ejector; The pump system boosts a part of the cooling seawater discharged from the condenser to be supplied to the water injector and to the preheater. In this embodiment, a pump for supplying cooling seawater to the condenser is further provided, and the pump is preferably a sea water pump for supplying water extracted from the sea to each of ships including a diesel engine. Sea water use. Further, it is preferable that the heat transfer tube is provided with a projection or a groove integrally formed on the inner surface or the outer surface to perform the uneven processing.

Further, in the vacuum evaporating water-making apparatus of all the above-described embodiments, the heater has a plurality of heating tubes into which the raw material seawater can be introduced, and each of the heating tubes is preferably an inner surface or an outer surface.

According to the vacuum evaporating water-making apparatus of the present invention, since the inner surface or the outer surface of each of the heat transfer tubes of at least one of the condenser and the preheater is processed, the heat transfer performance of each heat transfer tube can be improved. Therefore, the temperature of the seawater of the raw material supplied from the preheater to the heater is compared with that of the smooth tube The existing vacuum evaporation type water generating device of each heat transfer tube can reach a high temperature.

1‧‧‧Vacuum evaporative water generator

2‧‧‧ container body

3‧‧‧heater

4‧‧‧Condenser

5‧‧‧Preheater

6‧‧‧ device body

7‧‧‧Relief mechanism (water jet)

8‧‧‧jet pump

9‧‧‧Auxiliary pump

9A‧‧‧1st tube header

9B‧‧‧2nd tube header

10‧‧‧Ship hull

11‧‧‧ sea water pump

12‧‧‧Seawater supply channel

13‧‧‧Cooling water supply channel

14‧‧‧ branch channel

15, 19‧‧‧ water supply channel

16‧‧‧ Raw material seawater supply channel

17‧‧‧ gas passage

18‧‧‧ brine discharge channel

30‧‧‧heating room

31‧‧‧heat pipe

32‧‧‧Seawater supply room

33‧‧‧ Raw material seawater inlet

34‧‧‧Warm water inlet

35‧‧‧Warm water discharge

40, 50‧‧‧ heat transfer tube

41, 51‧‧‧ wall

42, 52‧‧ ‧ convex

43, 53‧‧ ‧ recess

90A, 90B, 93A, 93B, 98A, 98B‧‧ ‧ partition

91A, 91B‧‧‧ Preheating tube box room

92A, 92B‧‧‧Condensation tube box room

94a‧‧‧Cooling water inlet room

94b, 99e‧‧‧ proximal reentry room

94c, 99c‧‧‧ inside reentry room

94d‧‧‧Cooling water outlet room

95‧‧‧Cooling water inlet

96‧‧‧ Freshwater exports

97‧‧‧Cooling water outlet

99a‧‧‧ Raw seawater entrance room

99b, 99d‧‧‧ Central Reentry Room

100‧‧‧ Raw seawater inlet

101‧‧‧ Raw seawater exports

102‧‧‧Exhaust pipe

103‧‧‧Salt outlet

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a vacuum evaporation type water generator according to an embodiment of the present invention.

Figure 2 is a longitudinal sectional view of the apparatus body of Figure 1.

Figure 3 is a cross-sectional view taken along line I-I of Figure 2.

Figure 4 is a cross-sectional view taken along line II-II of Figure 2.

5(A) to (C) are cross-sectional views of the heat transfer tubes.

Fig. 6 is a longitudinal sectional view showing the apparatus body of another embodiment.

7(A) to (C) are cross-sectional views of a heating pipe.

Fig. 8 is a schematic block diagram showing a vacuum evaporation type water generator according to another embodiment of the present invention.

Fig. 9 is a schematic block diagram showing a vacuum evaporation type water generator according to another embodiment of the present invention.

Fig. 10 is a schematic block diagram showing a vacuum evaporation type water generator according to another embodiment of the present invention.

Form for implementing the invention

Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a schematic structural view of a vacuum evaporation type water generator 1 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the apparatus body 6 of FIG. As shown in FIGS. 1 and 2, the vacuum evaporating water-making apparatus 1 of the present embodiment includes an apparatus main body 6, which is composed of a sealed container main body 2, a heater 3, a condenser 4, and a preheater 5. a constituting body; and a pressure reducing mechanism 7, which protects the container body 2 Hold in the state of decompression (vacuum). Further, in Fig. 1, reference numeral 10 denotes a ship's hull, and reference numeral 11 is provided in a ship for extracting seawater from the sea. The seawater pumped up by the sea water pump 11 is supplied to various seawater use places. For example, it is supplied to the diesel engine mounted in the ship, and is supplied to the condenser 4 as cooling water for cooling the diesel engine. It is used as cooling water for water generation by the vacuum evaporation type water generator 1.

The container body 2 has a heater 3 connected to the lower portion, and a condenser 4 and a preheater 5 are housed in the upper portion. Further, an exhaust pipe 102 is provided in the upper portion of the container body 2, and a brine outlet 103 is provided at a position higher than the lower heater 3.

The exhaust pipe 102 is connected to the pressure reducing mechanism 7 through the gas passage 17. In the present embodiment, the pressure reducing mechanism 7 is constituted by a water ejector, and the non-condensable gas system inside the container body 2 is sucked by the water ejector 7 from the exhaust pipe 102, so that the inside of the container body 2 is kept at a relatively low gas pressure. In the reduced pressure (vacuum) state, evaporation/condensation of the raw material seawater described later is performed in the container main body 2 under reduced pressure (vacuum). Further, the brine outlet 103 is connected to the water ejector 7 through the brine discharge passage 18, and the evaporated brine (seawater) is sucked from the brine outlet 103 by the water ejector 7 in the container body 2 to be described later, and then discharged to the vessel. outer.

The heater 3 includes a sealed heating chamber 30 and a plurality of heating tubes 31 provided in the heating chamber 30. The plurality of heating pipes 31 are arranged to extend in the vertical direction, and both end portions thereof are connected to the upper wall surface and the lower wall surface of the heating chamber 30. A seawater supply chamber 32 is connected to a lower portion of the heating chamber 30, and a seawater supply chamber 32 is provided with a raw material seawater for introducing the heating pipes 31. Raw material seawater introduction port 33. The warm water inlet port 34 and the warm water discharge port 35 are provided on the side wall surface of the heating chamber 30, and the warm water such as the cylinder liner cooling water for the diesel engine is introduced and discharged. The raw material seawater introduced into the heating pipes 31 from the raw material seawater inlet 33 is heated by heat exchange with warm water introduced into the heating chamber 30 from the warm water inlet 34, and is vaporized to be supplied to the vessel. Inside the body 2.

The condenser 4 is for cooling the steam supplied into the container main body 2 to generate fresh water, and includes a plurality of heat transfer tubes 40, and the first tube header 9A and the second tube header 9B. The two ends of the heat transfer tube group bundled by the plurality of heat transfer tubes 40 are respectively connected. Each of the heat transfer tubes 40 is disposed to extend in the horizontal direction, and both end portions thereof are connected to the left wall surface and the right wall surface of the container body 2.

Above the condenser 4, a plurality of heat transfer tubes 50 constituting the preheater 5 are provided. The plurality of heat transfer tubes 50 are arranged to extend in the horizontal direction, and both end portions are connected to the left wall surface and the right wall surface of the container body 2, and are connected to the first tube header 9A and the second tube header 9B. .

Separators 90A and 90B are provided in the first and second tube headers 9A and 9B, respectively. The two pipe headers 9A and 9B are divided into upper preheating pipe header chambers 91A and 91B and lower condensation pipe header chambers 92A and 92B by the respective partition plates 90A and 90B. The preheating tube header chambers 91A and 91B communicate with the respective heat transfer tubes 50 constituting the preheater 5, and the condensation tube header chambers 92A and 92B communicate with the respective heat transfer tubes 40 constituting the condenser 4.

In each of the condensation tube header chambers 92A and 92B, as shown in Fig. 3, partition plates 93A and 93B are provided, respectively. Condensation tube header box of the first tube header box 9A The inside of the 92A is divided into a cooling water inlet chamber 94a on the inner side and a folding chamber 94b on the side in the inner side by the partition plate 93A. Further, the inside of the condensation header 92B of the second header 9B is partitioned by the partition plate 93B into a proximal cooling water outlet chamber 94d and an inner folded chamber 94c.

The cooling water inlet chamber 94a is provided with a cooling water inlet 95 for introducing cooling seawater for cooling/condensing the steam in the container body 2. A cooling water supply passage 13 is connected to the cooling water inlet 95, and is connected to the seawater supply passage 12 from the sea water pump 11 to the seawater use point in the ship (refer to FIG. 1), and is activated by the sea water pump 11 Seawater is introduced as cooling water. The seawater for cooling introduced in the cooling water inlet chamber 94a is relayed in each of the heat transfer tubes 40, as indicated by the arrows in Fig. 3, through the respective folded-back chambers 94b and 94c, and to the other second header box 9B. The cooling water outlet chamber 94d flows in the direction. The steam supplied into the container main body 2 is cooled and condensed by heat exchange with the cooling seawater flowing through the respective heat transfer tubes 40, and the fresh water generated by the condensation is supplied from the fresh water outlet 96 of the container body 2. take out.

A cooling water outlet 97 for discharging the seawater for cooling is provided in the cooling water outlet chamber 94d. A part of the seawater for cooling discharged from the cooling water outlet 97 is supplied to the jet pump 8 through the branch passage 14, and the other part is supplied to the preheater 5 through the water supply passage 15, and the rest is discharged to the outside of the ship (refer to Fig. 1). ). The jet pump 8 is for driving the water jet 7 and is provided integrally with the apparatus body 6. The seawater for cooling supplied to the jet pump 8 is boosted by the jet pump 8, and then supplied to the water ejector 7, and the water ejector 7 is driven, and then discharged to the outside of the ship.

Next, in each of the preheating tube header chambers 91A and 91B, As shown in Fig. 4, two partition plates 98A and 98B are provided, respectively. In the preheating pipe header 91A of the first header 9A, the raw material seawater outlet chamber 99f and the center and proximal folding chambers 99d and 99e are defined by the partition plate 98A. In the preheating pipe header 91B of the second header 9B, the partition 98B is divided into a raw material seawater inlet chamber 99a and a center and inner folding chambers 99b and 99c.

In the raw material seawater inlet chamber 99a, a raw material seawater inlet 100 for introducing a part of the cooling seawater discharged from the condenser 4 is provided. A feed water passage 15 is connected to the raw material seawater inlet 100; and an auxiliary pump 9 is provided in the water supply passage 15 (see Fig. 1). A part of the seawater for cooling discharged from the condenser 4 is introduced into the raw material seawater inlet chamber 99a while being pressurized by the auxiliary pump 9. Next, in each of the heat transfer tubes 50 constituting the preheater 5, as shown by the arrows in Fig. 4, the raw material seawater outlet chambers 99f of the first header header 9A of the other side are passed through the respective folding chambers 99b to 99e. The direction flows. At this time, when the seawater for cooling flows in each of the heat transfer tubes 50, it is introduced into the raw material seawater outlet chamber 99f while being heated by heat exchange with the steam supplied into the container main body 2.

A raw material seawater outlet 101 for discharging the seawater for cooling is provided in the raw material seawater outlet chamber 99f. The seawater for cooling discharged from the raw material seawater outlet 101 passes through the raw material seawater supply passage 16 and is supplied to the seawater supply chamber 32 as raw material seawater.

As described above, due to the presence of the preheater 5 having the above configuration, a part of the seawater for cooling discharged from the condenser is further heated by heat exchange with the higher temperature steam supplied into the container main body 2, and then The raw material seawater is supplied to the heater 3. Therefore, the temperature of the seawater of the raw material supplied to the heater 3 can be relatively increased, so that the thermal efficiency of the heater 3 can be improved.

As shown in FIG. 5, each of the heat transfer tubes 40 constituting the condenser 4 and the heat transfer tubes 50 constituting the preheater 5 are subjected to uneven processing on the inner surface and the outer surface. In the present embodiment, each of the heat transfer tubes 40, 50 is constituted by a corrugated tube, and a plurality of convex portions 42, 52 and concave portions 43, 53 are alternately connected to the tube walls 41, 51. The cross-sectional shapes of the convex portions 42, 52 and the concave portions 43, 53 can be formed in a mountain shape as shown in Fig. 5(A), and a rectangular shape or a wave shape as shown in Figs. 5(B) and (C). And so on.

Further, as the heat transfer tubes 40 and 50, in addition to the corrugated tube, a processing tube which is subjected to concavo-convex processing, which is a smooth tube which is smooth to the tube walls 41 and 51, is formed on the tube walls 41 and 51. The inner surface and the outer surface are integrally provided with a plurality of annular projections extending in the circumferential direction at predetermined intervals in the axial direction. Further, as the processing tube, the protrusions may be integrally formed by spirally providing the protrusions on the inner surface and the outer surface of the tube walls 41 and 51 of the smooth tube. Alternatively, the protrusion may be replaced by a groove. The inner surface and the outer surface of the tube walls 41 and 51 of the smoothing tube are integrally provided in the same manner as the protrusions to perform the uneven processing. Further, it is also possible to perform the concavo-convex processing by integrally providing a plurality of protrusions or grooves extending in the axial direction at predetermined intervals in the circumferential direction on the inner surface and the outer surface of the tube walls 41 and 51. As described above, the method of performing the uneven processing on the inner surface and the outer surface of the tube walls 41 and 51 is not particularly limited as long as the surface area of each of the heat transfer tubes 40 and 50 is increased.

In the vacuum evaporation line water generating device 1 of the present embodiment, since the inner surface and the outer surface of each of the heat transfer tubes 40 and 50 of the condenser 4 and the preheater 5 are subjected to convex and concave processing, the outer diameter is relatively small. The same smoothing tube has a large surface area of each of the heat transfer tubes 40, 50, that is, a large heat transfer area is ensured during heat exchange between the inside and outside of the heat transfer tube, and the unevenness causes cooling in the heat transfer tube. Use the sea The water system is stirred to increase the heat transfer efficiency between the steam on the heat transfer surfaces (tube walls 41, 51) and the sea water for cooling, and the heat exchange amount of each of the heat transfer tubes 40, 50 is increased. Therefore, by performing the convex-concave processing on the inner surface and the outer surface of each of the heat transfer tubes 40 and 50, the cooling seawater flowing in each of the heat transfer tubes 40 and 50 can be made to be vaporized by steam compared to the case where the smooth tube is used. The heat exchange is further heated to a high temperature, and as a result, the temperature of the raw material seawater supplied to the heater 3 can be further increased. Therefore, the thermal efficiency of the heater 3 can be further improved.

On the other hand, when the inner surface and the outer surface of each of the heat transfer tubes 40 and 50 are subjected to the convex-concave processing, the tube friction coefficient is increased by the unevenness, and the pressure loss of the cooling seawater flowing in the heat transfer tube is increased. Therefore, in order to prevent the fluidity of the seawater for cooling from deteriorating, it is necessary to increase the size of the heat transfer tube or to increase the capacity/lift of the sea water pump. In the case of the condenser 4, since the seawater pressurized by the sea water pump 11 is supplied, it is less likely to be affected by the increase in pressure loss, but the preheater 5 is supplied with cooling by the condenser 4 With seawater, and the pressure loss of the preheater 5 itself is also increased, the pressure of the seawater at the raw material seawater outlet 101 at the outlet of the preheater 5 is greatly reduced as compared with the case of using a smooth tube. When the pressure loss from the raw material seawater outlet 101 is lowered, the pressure of the seawater from the raw material seawater outlet 101 is lowered, and there is a fear that the raw material seawater cannot be sufficiently supplied to the heater 3. In order to eliminate this concern, although the capacity/head of the sea water pump 11 is generally considered to be increased, the cost and cost of the pump itself may be increased by further increasing the capacity of the large sea water pump 11 that supplies seawater to each seawater use location in the ship. There are problems such as a large increase in operating expenses such as electricity. Therefore, in the vacuum evaporation type water generating device 1 of the present embodiment, the water supply passage 15 between the condenser 4 and the preheater 5 is provided with a small auxiliary pump 9, which will The seawater for cooling discharged from the condenser 4 is boosted by the auxiliary pump 9, and then supplied to the preheater 5. Thereby, even in the preheater 5, heat exchange with the steam can be promoted, and the pressure loss of the seawater for cooling can be increased, so that the amount of water supplied to the raw material seawater of the heater 3 can be sufficiently ensured.

According to the vacuum evaporation type water generator 1 of the above configuration, since the multi-tube type preheater 5 is provided above the multi-tube type condenser 4 of the container body 2, the seawater supplied to the heater 3 is heated. A space for separating the preheater 5 from the condenser 4 is no longer required, and the device can be miniaturized.

Further, since the inner surface and the outer surface of each of the heat transfer tubes 40 and 50 of the condenser 4 and the preheating tube 5 are processed, the heat transfer performance of each of the heat transfer tubes 40 and 50 can be improved. Therefore, the temperature of the raw material seawater supplied from the condenser 4 to the heater 3 through the preheater 5 can be increased to be higher than that of the existing vacuum evaporation type water generating device in which the heat transfer tubes 40 and 50 are formed by the smooth tubes. The higher the temperature, the further the thermal efficiency of the heater 3 can be further increased. Further, an auxiliary pump 9 is provided in the water supply passage 15 between the condenser 4 and the preheater 5, and the cooling seawater discharged from the condenser 4 is boosted by the auxiliary pump 9 and supplied to the preheater 5, thereby coping with The pressure loss of the cooling seawater (raw material seawater) flowing in each of the heat transfer tubes 50 of the preheater 5 is increased. Therefore, the raw material seawater can be sufficiently supplied to the heater 3. As a result, the amount of fresh water produced in the vacuum evaporation type water generator 1 can be increased, and the water generation performance of the apparatus can be improved. On the other hand, compared with the existing vacuum evaporation type water generating device in which each of the heat transfer tubes 40 and 50 is composed of a smooth tube, even if the water generation performance of the device is improved, even the condenser 4 and the preheater 5 are reduced. The amount of each of the heat transfer tubes 40, 50 can also produce approximately the same amount of fresh water. Therefore, the simplification of the device can be achieved.

Further, in the existing vacuum evaporation type water generating device in which each of the heat transfer tubes 40 and 50 is composed of a smooth tube, the smooth tube can be replaced by a corrugated tube or a processing tube which is subjected to uneven processing on the inner surface and the outer surface. By improving the water-generating performance of the device, it is possible to upgrade the existing vacuum evaporation type water-making device in a simple and low-cost manner.

The above is a description of the embodiments of the present invention, and the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the embodiment of Fig. 1, the inner surface and the outer surface of each of the heat transfer tubes 40 and 50 are subjected to uneven processing, but the concave and convex processing may be performed only on one of the inner surface and the outer surface.

Further, although the heat transfer tubes 40 and 50 of the condenser 4 and the preheater 5 are subjected to the uneven processing, the heat transfer tubes 50 of the heat transfer tubes 40 or the preheaters 5 of the condenser 4 may be used only. One of them is subjected to concave and convex processing.

Further, the heating pipes 31 of the heater 3 may be subjected to uneven processing in the same manner as the heat transfer tubes 40 and 50 of the condenser 4 and the preheater 5. Fig. 6 shows an embodiment in which the heat transfer tubes 31 of the heater 3 are also subjected to uneven processing in addition to the heat transfer tubes 40 and 50 of the condenser 4 and the preheater 5 (variation of Fig. 2) . Similarly to the heat transfer tubes 40 and 50 of the condenser 4 and the preheater 5, each of the heating tubes 31 has a plurality of convex portions 31B and recessed portions 31C alternately connected to each other on the tube wall 31A. The inner surface and the outer surface are subjected to concave and convex processing. The cross-sectional shape of the convex portion 31B and the concave portion 31C can be formed into a mountain shape as shown in Fig. 7(A), and various shapes such as a rectangular shape or a wave shape as shown in Figs. 7(B) and (C) can be formed. . The heating pipe 31 having the above configuration may be suitably used A corrugated tube is used, but a processing tube which is processed by concavo-convex processing may be used in addition to the corrugated tube. The concavo-convex processing is a smooth tube which is smooth to the tube wall 31A, and extends in the circumferential direction on the inner surface and the outer surface of the tube wall 31A. The plurality of annular projections are integrally provided at predetermined intervals in the axial direction. Further, as the processing tube, the protrusion may be integrally provided in a spiral shape on the inner surface and the outer surface of the tube wall 31A of the smooth tube to perform the uneven processing, or the groove may be replaced by the groove, and the tube wall 31A of the smooth tube may be used. The inner surface and the outer surface are integrally provided in the same manner as the protrusions, thereby performing the uneven processing. Further, in the smooth tube, a plurality of projections or grooves extending in the axial direction may be integrally provided at a predetermined interval in the circumferential direction on the inner surface and the outer surface of the tube wall 31A, thereby performing uneven processing. As described above, as long as the surface area of each of the heating pipes 31 can be increased, the method of processing the inner and outer surfaces of the pipe wall 31A is not limited.

By processing the inner surface and the outer surface of each of the heating tubes 31 of the heater 3, the surface area of each of the heating tubes 30 is larger than that of the smooth tubes having substantially the same outer diameter, that is, ensuring the inside and outside of the heating tubes. Large heat transfer area for heat exchange. Further, the raw material seawater flowing in the heating pipe is stirred by the unevenness, thereby improving the heat transfer efficiency between the warm water on the heat transfer surface (the pipe wall 31A) and the raw material seawater. As a result, the amount of heat exchange between the respective heating tubes 31 increases. Therefore, in the embodiment shown in Fig. 6, by performing the convex and concave processing on the inner surface and the outer surface of each of the heating tubes 31, the raw material seawater flowing in each of the heating tubes 31 can be made as compared with the case where the smooth tubes are used. The heat exchange is efficiently performed with warm water, and the heating efficiency of each heating pipe 31 is improved. As a result, the evaporation efficiency of the raw material seawater is good, and the vapor can be sufficiently supplied into the container body 2.

Moreover, in the above embodiment of FIG. 1, as the heater 3 The heat source for heating/evaporating the raw material seawater utilizes waste heat from the diesel engine, but in addition, waste heat from a device that generates waste heat may be utilized, such as using steam from the boiler to make the raw material seawater in the heater 3. Heating/evaporation is also possible.

Further, in the embodiment of Fig. 1, part of the cooling seawater discharged from the condenser 4 is boosted by the auxiliary pump 9 and supplied to the preheater 5 through the water supply passage 15, but the cooling water may be omitted. Auxiliary pump 9. Fig. 8 is a schematic view showing a modification of the embodiment of Fig. 1 and showing a schematic configuration of the vacuum evaporation type water generator 1 in which the auxiliary pump 9 is omitted. In addition, the basic structure is the same as that of the above-mentioned embodiment of FIG. 1, and since the corresponding structure is attached with the same code|symbol, description is abbreviate|omitted.

In the embodiment of Fig. 8, a part of the seawater for cooling discharged from the condenser 4 is partially supplied to the jet pump 8 through the branch passage 14, and the rest is discharged to the outside of the ship. The seawater for cooling supplied to the jet pump 8 is supplied to the water injector 7 after being pressurized by the jet pump 8, and the remaining is supplied to the preheater 5 through the passage 19. Then, the seawater for cooling supplied to the preheater 5 is heated by heat exchange with the steam supplied into the container main body 2, and then supplied as raw material seawater to the heater 3 through the raw material seawater supply passage 16. In the embodiment of FIG. 8, the passage on the discharge side of the jet pump 8 is branched, and the seawater for cooling boosted by the jet pump 8 is supplied to the preheater 5 through the water supply passage 19, thereby coping with the preheating The pressure loss of the seawater for cooling flowing in each of the heat transfer tubes 50 of the heat exchanger 5 is increased, and the raw material seawater can be sufficiently supplied to the heater 3. As a result, not only the same action/effect as the embodiment of Fig. 1 but also the auxiliary pump 9 can be realized, and the device can be simplified.

Further, in the embodiment of Fig. 1, the jet pump 8 and the apparatus main body 6 are integrally provided. However, as shown in Fig. 9, the jet pump 8 may be disposed below the apparatus main body 6. . In the embodiment of Fig. 1, the jet pump 8 is supplied with a part of the seawater for cooling discharged from the condenser 4, but in the embodiment of Fig. 9, the jet pump 8 is seawater extracted from the sea. The drive water is supplied to the water injector 7.

Further, in the embodiment of FIGS. 1, 8, and 9, a water ejector is used as the pressure reducing mechanism 7, but it is not necessarily limited thereto, and may be a vacuum pump or the like.

Further, Fig. 10 is a schematic configuration view showing a vacuum evaporation type water generator 1 according to another embodiment of the present invention. In addition, the basic structure is the same as that of the above-mentioned embodiment of FIG. 1, and the description is abbreviate|omitted by the same code|symbol.

In the embodiment of FIG. 10, the seawater supplied to the ejector 7 from the jet pump 8 as the driving water is transmitted through the cooling water supply circuit 13 as the cooling water for water generation by the vacuum evaporation type water generator 1. It is supplied to the condenser 4. As the jet pump 8, a small pump that draws seawater from the sea and supplies it only to the water injector 7 is used.

In the embodiment of FIG. 10, the cooling seawater supplied to the condenser 4 is cooled and condensed in the container body 2 to generate fresh water, and then discharged from the condenser 4, but A part is supplied to the preheater 5 and heated by heat exchange with the steam supplied into the container main body 2, and then supplied as raw material seawater to the seawater supply chamber 32 through the raw material seawater supply passage 16. Here, by the heat transfer tubes 50 of the preheater 5 In one step, the inner surface and the outer surface of each heat transfer tube 40) of the condenser 4 are subjected to uneven processing, so that the temperature of the seawater supplied to the heater 3 can be made higher, and the thermal efficiency of the heater 3 can be improved. On the other hand, in the embodiment of Fig. 10, the auxiliary pump 9 is not required by increasing the capacity and the like of the jet pump 8, and the flow can be coped with a low cost because the capacity of the sea water pump 11 is increased or the like. Since the pressure loss of the seawater for cooling in each of the heat transfer tubes 50 of the preheater 5 (even the heat transfer tubes 40 of the condenser 4) is increased, the raw material seawater can be sufficiently supplied to the heater 3. As a result, the same action/effect as the embodiment of Fig. 1 can be achieved.

Claims (7)

A vacuum evaporating water-making device for manufacturing fresh water from seawater introduced into a ship by using heat from a heat source mounted on a ship, the vacuum evaporating water-making device having: a heater, which is provided by a heat source The heat is generated by heating the supplied raw material seawater to form a vapor; the container body is a sealed container body that introduces the steam generated by the heater; and the pressure reducing mechanism is a device for decompressing the inside of the container; a plurality of heat transfer tubes for cooling fresh water in the body of the container by cooling seawater to form fresh water; and the preheater having a plurality of heat transfer tubes, wherein the vapor in the body of the container is condensed from the foregoing The portion of the cooling seawater discharged from the device is heated and supplied to the heater as raw material seawater; and the inner surface or the outer surface of each of the heat transfer tubes of at least one of the condenser and the preheater is subjected to uneven processing, and a pump for supplying cooling seawater to the condenser; the pressure reducing mechanism is a water ejector driven by seawater, and the pump is for driving Water is supplied to the jet pump by the water jet; and discharged from the driving of the ejector with the water as the cooling water system is supplied with sea water to the condenser. A vacuum evaporating water-making device for manufacturing fresh water from seawater introduced into a ship by using heat from a heat source mounted on a ship, the vacuum evaporating water-making device having: a heater, which is provided by a heat source The heat is generated by heating the supplied raw material seawater to form a vapor; the container body is a sealed container body that introduces the steam generated by the heater; and the pressure reducing mechanism is a device for decompressing the inside of the container; a plurality of heat transfer tubes for cooling fresh water in the body of the container by cooling seawater to form fresh water; and the preheater having a plurality of heat transfer tubes, wherein the vapor in the body of the container is condensed from the foregoing The portion of the cooling seawater discharged from the device is heated and supplied to the heater as raw material seawater; and the inner surface or the outer surface of each of the heat transfer tubes of at least one of the condenser and the preheating preheater is processed by embossing, wherein The pressure reducing mechanism is a water injector driven by seawater; and further includes an injection pump for supplying driving seawater to the water injector; the jet pump system Since the discharged cooling of the condenser part of a boost to the water supplied to the water injector and supplied to the preheater. A vacuum evaporating water-making device for manufacturing fresh water from seawater introduced into a ship by using heat from a heat source mounted on a ship, the vacuum evaporating water-making device having: The heater generates a vapor by heating the supplied raw material seawater by heat from a heat source; the container body is a sealed container body that introduces steam generated by the heater; and a pressure reducing mechanism a condenser having a plurality of heat transfer tubes, wherein the steam in the container body is cooled by cooling seawater to generate fresh water; and the preheater has a plurality of heat transfer tubes, and the container is The vapor in the body is heated from a part of the cooling seawater discharged from the condenser, and supplied to the heater as raw material seawater; and the pump is used to supply cooling seawater to the condenser, wherein the condensation The inner surface or the outer surface of each of the heat transfer tubes of at least one of the preheater and the preheater are subjected to concavo-convex processing, and a cooling seawater discharged from the condenser is provided between the condenser and the preheater a part of the pump is supplied to the auxiliary pump of the preheater, and the pump is used to supply the seawater pumped from the sea to the sea water pump at the use of each seawater of the ship, The pressing mechanism is a water ejector driven by seawater, and the jet pump is integrally provided in the apparatus body composed of the container body, the heater, the condenser, and the preheater, and the jet pump is used for driving The seawater is supplied to the water ejector, and the jet pump boosts a part of the seawater for cooling discharged from the condenser to be supplied to the water ejector. A vacuum evaporating water-making device for manufacturing fresh water from seawater introduced into a ship by using heat from a heat source mounted on a ship, the vacuum evaporating water-making device having: a heater, which is provided by a heat source The heat is generated by heating the supplied raw material seawater to form a vapor; the container body is a sealed container body that introduces the steam generated by the heater; and the pressure reducing mechanism is a device for decompressing the inside of the container; a plurality of heat transfer tubes, wherein the fresh water is cooled by cooling the seawater in the container body by cooling seawater; the preheater has a plurality of heat transfer tubes, and the vapor in the container body is from the condenser The discharged seawater for cooling is heated to be supplied to the heater as raw material seawater; and the pump is for supplying cooling seawater to the condenser, wherein at least one of the condenser and the preheater is provided The inner surface or the outer surface of each of the heat transfer tubes is subjected to concavo-convex processing, and between the condenser and the preheater, cooling is performed from the condenser. A part of the seawater is pressurized to be supplied to the auxiliary pump of the preheater, and the pump is for supplying seawater extracted from the sea to the sea water pump at the use of each seawater of the ship, and the pressure reducing mechanism is driven by seawater. The water ejector, the jet pump is disposed below the device body composed of the container body, the heater, the condenser, and the preheater In the position, the jet pump is for supplying the seawater for driving to the water injector, and the jet pump pressurizes the seawater extracted from the sea to supply the water injector. The vacuum evaporation type water generator according to any one of claims 1 to 4, wherein the heat transfer tube is composed of a corrugated tube. The vacuum evaporating water-making apparatus according to any one of claims 1 to 4, wherein the heat transfer tube is provided with a projection or a groove integrally formed on the inner surface or the outer surface to perform uneven processing. The vacuum evaporating water-making apparatus according to any one of claims 1 to 4, wherein the heater has a plurality of heating tubes into which seawater of the raw material can be introduced, and the inner surface of the heating tubes or the outer surface is processed by the unevenness.