JPH06254534A - Vacuum-evaporation water generator - Google Patents

Abstract

PURPOSE:To miniaturize a feed water heater when provided and to reduce the production cost in the vacuum-evaporation water generator in which seawater in a vacuum evaporation chamber is heated by a heater to boil and evaporate the seawater and the generated steam is condensed by a shell-and-tube condenser with seawater as the cooling source to produce fresh water. CONSTITUTION:Partition plates 6a and 7a are provided respectively in both headers 6 and 7 in a condenser 4 to divide the headers into the cooling seawater inlet section 11a and outlet section 12a and the feed water inlet section 10a and outlet section 9a communicated with the heat-transfer tubes 5a as a part of many heat-transfer tubes. A feed water pipeline 16 from the feed water outlet section 9a is connected to a vacuum-evaporation chamber 1, while a communicating hole 17 is formed in the partition plate 7a to communicate the cooling seawater outlet section 12a with the feed water inlet section 10a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum evaporation type water producing apparatus for producing fresh water from seawater by vacuum evaporation.
The present invention relates to an improvement in a vacuum evaporation type water producing apparatus equipped with a feed water heater.

[0002]

2. Description of the Related Art Generally, a vacuum evaporation type water producing apparatus of this type is used as an indirect heat exchange type heater in which sea water in a vacuum evaporation chamber is heated by steam from a boiler or circulating cooling water for a diesel engine. It is boiled and evaporated by heating by heating, and the steam generated in the vacuum evaporation chamber is condensed in a multi-tube condenser using seawater as a cooling source to produce fresh water, while it is discharged from the condenser. A part of the cooling seawater is supplied into the vacuum evaporation chamber.

By the way, since the temperature of the cooling seawater discharged from the condenser is considerably lower than the temperature in the vacuum evaporation chamber, in a conventional vacuum evaporation type water producing apparatus, for example, Japanese Utility Model Publication No. 53-26436. As described in the publication etc., a part of the cooling seawater discharged from the condenser is introduced to an indirect heat exchange type feedwater heater using the steam generated in the vacuum evaporation chamber as a heating source, The temperature is further raised and then supplied into the vacuum evaporation chamber to improve the thermal efficiency.

[0004]

However, in the conventional vacuum evaporation type water producing apparatus, the feed water heater of the indirect heat exchange type is provided separately from the condenser, so that the feed water is supplied. A space for arranging the heater must be secured, a means for supporting the feedwater heater, and a conduit for guiding a part of the cooling seawater in the condenser to the feedwater heater. Etc. are required, so not only will the vacuum evaporation type desalination apparatus be increased in size,
There is a problem that the structure becomes complicated and the manufacturing man-hour increases, resulting in a large increase in manufacturing price.

An object of the present invention is to solve this problem and to reduce the size and cost of a vacuum evaporation type fresh water producing apparatus with a feed water heater.

[0006]

In order to achieve this technical object, the present invention provides a vacuum evaporation chamber, a heater for seawater supplied therein, and a multitubular type for vapor generated in the vacuum evaporation chamber. A vacuum evaporation type desalination apparatus comprising a condenser and a header for each heat transfer tube in the condenser at both ends of the condenser, wherein both headers in the condenser cool the inside of the header. A partition plate is provided to partition the inlet chamber and outlet chamber for seawater and the inlet chamber and outlet chamber for water supply, which communicate with a part of the plurality of heat transfer pipes in the condenser, and the outlet for water supply is provided. While connecting the water supply line from the chamber to the vacuum evaporation chamber,
The partition plate between the cooling seawater outlet chamber and the water supply inlet chamber is provided with a communication hole that communicates with each other.

[0007]

[Operation] In this structure, the seawater in the vacuum evaporation chamber is boiled by heating by the heater, and the steam generated by this boiling evaporation is condensed by the condenser and taken out as fresh water. On the other hand, the cooling seawater supplied into the cooling seawater inlet chamber in the header of the condenser is in each heat transfer tube in the condenser except for some heat transfer tubes, toward the cooling seawater outlet chamber. After flowing, the cooling seawater is discharged from the cooling seawater outlet chamber, while a part of the cooling seawater in the cooling seawater outlet chamber flows into the water supply inlet chamber through the communication hole provided in the partition plate.

The seawater that has flowed into the water supply inlet chamber in this way is generated in the vacuum evaporation chamber when it flows through some of the heat transfer tubes in the condenser toward the water supply outlet chamber. After being heated by the steam (heating of the water supply), the water is supplied from the water supply outlet chamber into the vacuum evaporation chamber through the water supply pipe line.

[0009]

[Effects of the Invention] That is, according to the above-mentioned constitution, the feed water can be heated by using a part of the heat transfer tube in the multi-tube condenser. Since it can be used as, it is possible to omit securing a space for disposing the feed water heater separately from the condenser as in the conventional case,
Moreover, since a part of the cooling seawater discharged from the condenser can be introduced for water supply through the communication hole formed in the partition plate in the header, a part of the cooling seawater discharged from the condenser can be introduced. It is possible to completely omit the conduit for guiding the water to the water supply.

Therefore, according to the present invention, the vacuum evaporation type water producing apparatus with a feed water heater can be greatly reduced in size and weight, and the supporting structure and the pipeline for the feed water heater can be simplified, resulting in a large production cost. It has the effect that it can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a case where the present invention is applied to a single-effect type vacuum evaporation type water producing apparatus. In the figure, reference numeral 1 indicates a vacuum evaporation chamber, and at the bottom of the vacuum evaporation chamber 1, a multi-tube heater 2 having a seawater supply chamber 3 at the lower end is provided, while the vacuum evaporation chamber 1 is provided. In the upper part of the inside, a multi-tube condenser 4 having headers 6 and 7 at the left and right ends of a heat transfer tube group 5 in which a plurality of heat transfer tubes are bundled is laterally arranged.

The seawater supplied to the seawater supply chamber 3 is boiled and evaporated by heating it with a heating fluid supplied to the multitubular heater 2 so that it enters from the inlet 2a and flows out from the outlet 2a. The vapor generated by the boiling evaporation is introduced into the heat transfer tube group 5 in the multi-tube condenser 4 and condensed, so that the condensed water is taken out as fresh water from the fresh water outlet 8 at the bottom of the condenser 4. To do.

On the other hand, inside the headers 6 and 7 of the condenser 4, inside the headers 6 and 7, a large number of heat transfer tubes in the heat transfer tube group 5 are heated by a plurality of feed water in a part thereof. Feed water heating header chambers 9 and 10 communicating with the heat transfer tube 5a for cooling, and most of the remaining condensing heat transfer tube 5b
Partition plates 6a and 7a for partitioning into the condensation header chambers 11 and 12 that communicate with each other are provided.

A partition plate 6b for partitioning the condensation header chamber 11 into a cooling seawater inlet chamber 11a and a folding chamber 11b is provided in the condensation header chamber 11 of one of the headers 6 and 7. Further, the condensing header chamber 12 of the other header 7 is provided with a partition plate 7b for partitioning the condensing header chamber 12 into a cooling seawater outlet chamber 12a and a folding chamber 12b. In the cooling seawater inlet chamber 11a in 6,
While supplying the cooling seawater from the inlet 13, the outlet 1 provided in the cooling seawater outlet chamber 12a in the other header 7
It is configured so that the cooling seawater flows out from No. 4.

In the header chamber 9 for heating water supply in one of the two headers 6, 7, the header chamber 9 for heating water supply is provided with an outlet chamber 9a for water supply and two folding chambers 9b, 9c. Partition plates 6c and 6d for partitioning into and are provided, and an outlet 15 from the water supply outlet chamber 9a is connected to the seawater supply chamber 3 via a water supply pipe 16.

On the other hand, in the header chamber 10 for heating the feed water in the other header 7, the header chamber 10 for heating the feed water is provided.
Inside is a water supply inlet chamber 10a and two folding chambers 10b,
Partition plates 7c and 7d for partitioning into 10c are provided,
Further, a communication hole 17 for communicating the water supply inlet chamber 10a and the cooling seawater outlet chamber 12a with each other is provided in the partition plate 7a of the header 7 at the portion of the water supply inlet chamber 10a.

In this structure, the cooling seawater supplied from the inlet 13 to the cooling seawater inlet chamber 11a in the one header 6 flows through the respective condensing heat transfer tubes 5b and the cooling seawater outlet chamber in the other header 7. After flowing back toward 12a, the cooling seawater is discharged from the outlet 14 in the cooling seawater outlet chamber 12a, while part of the cooling seawater in the cooling seawater outlet chamber 12a is partially discharged.
The water flows into the inlet chamber 10a for water supply from the communication hole 17 provided in the.

The seawater flowing into the water supply inlet chamber 10a in this way flows through a portion of the heat transfer pipes 5a of the condenser 4 in the heat transfer pipe group 5a into the water supply outlet chamber of the header 6. When it flows back toward 9a, it is warmed by the steam having a relatively high temperature generated in the vacuum evaporation chamber 1 (water supply heating), and then, from the water supply outlet chamber 9a through the water supply conduit 16 to It is supplied to the seawater supply chamber 3, heated by the heater 2 to evaporate by boiling, and then flows out from the brine outlet 18.

In this case, since the feed water can be heated by using a part of the heat transfer tubes 5a in the heat transfer tube group 5 of the multi-tube condenser 4, the feed water heater can be replaced by a condenser as in the conventional case. It is possible to omit to secure a space for disposing the cooling seawater separately, and a part of the cooling seawater discharged from the condenser is bored in the partition plate 7a in the header 7. By being able to guide water for supply through the communication hole 17, it is possible to completely omit a pipe line for guiding a part of the cooling seawater discharged from the condenser 4 for water supply.

FIGS. 6 to 12 show a case where the invention is applied to a double-effect type vacuum evaporation type water producing apparatus. In this figure, reference numeral 20 indicates one closed can body, and the inside of the closed can body 20 is
The first-stage vacuum evaporation chamber 21 and the second
It is partitioned into a step evaporation chamber 22. Both vacuum evaporation chambers 2
At the bottoms of the insides of the pipes 1 and 22, there are multitubular heaters 23 and 24 respectively.
In the first-stage vacuum evaporation chamber 21, the seawater in the first-stage vacuum evaporation chamber 21 is boiled by being heated by a first-stage heater 23 that uses a steam or other heat source as a heat source. The generated steam is guided from the steam outlet 25a through the duct 25 to the second-stage heater 24 and used as a heat source for heating the seawater in the second vacuum evaporation chamber 22 to evaporate it to boiling. The generated steam is condensed by a multi-tube condenser 26 provided in the upper portion of the closed can body 20, and the condensed water is taken out from a fresh water outlet 27 at the bottom of the condenser 26. .

The seawater (brine) that has evaporated in the first-stage vacuum evaporation chamber 21 is supplied to the second-stage vacuum evaporation chamber 22 via a pipe 28, and the second-stage vacuum evaporation chamber 22 is supplied. The seawater (brine) that has evaporated inside is discharged from the brine outlet 29. Further, demisters 30 and 31 for collecting the mist in the vaporized vapor are provided in the upper portions of the vacuum evaporation chambers 21 and 22, respectively.

A large number of condensing heat transfer tubes 34 are provided between the left and right headers 32 and 33 of the condenser 26.
A plurality of feed water heating heat transfer tubes 35 are provided as a bundle of heat transfer tube groups, while a partition plate 36 is provided between each condensation heat transfer tube 34 and each feed water heating heat transfer tube 35, The second stage vacuum evaporation chamber 2 is provided on the surface of each heat transfer tube 34 for condensation.
The steam generated in 2 is introduced to the heat transfer pipes 3 for heating the respective feed water.
The high temperature vapor generated in the first-stage vacuum evaporation chamber 21 is guided to the surface of No. 5.

On the other hand, inside the headers 32 and 33 of the condenser 26, there are provided feed water heating header chambers 37 and 38 which communicate the insides of the headers 32 and 33 with the feed water heating heat transfer tubes 35, respectively. Partitioning plates 32a and 33a for partitioning the condensation header chambers 39 and 40, which communicate with the condensation heat transfer tubes 34, are provided. Both headers 32,
A partition plate 32b for partitioning the condensation header chamber 39 into a cooling seawater inlet chamber 39a and a folding chamber 39b is provided in the condensation header chamber 39 of one of the headers 33, and the other header 33 is also provided. A partition plate 33b for partitioning the condensation header chamber 40 into a cooling seawater outlet chamber 40a and a folding chamber 40b is provided in the condensation header chamber 40, and the cooling seawater inlet chamber 32a in the one header 32 is provided. At the inlet 41 of the cooling seawater
While supplying more, the cooling seawater is configured to flow out from the outlet 42 provided in the cooling seawater outlet chamber 40a in the other header 33.

A header chamber 37 for heating the feed water is provided in one of the headers 32 and 33.
Partition plates 32c, 32d for partitioning the interior of the header chamber 37 for heating the feed water into three folding chambers 37a, 37b, 37c are provided therein. Also, the other header 3
A partition plate 33c for partitioning the inside of the water supply heating header chamber 38 into a water supply inlet chamber 38a, two folding chambers 38b and 38c, and a water supply outlet chamber 38d. , 33d, 33e are provided, and further, in the partition plate 33a of the header 33, at the portion of the water supply inlet chamber 38a, the water supply inlet chamber 3 is provided.
8a and the cooling seawater outlet chamber 40a are provided with a communication hole 43 for communicating with each other, while the water supply outlet chamber 3 is provided.
The outlet 44 of 8d is connected to a seawater supply port 46 for the first vacuum evaporation chamber 21 via a water supply conduit 45.

In this structure, the cooling seawater supplied from the inlet 41 to the cooling seawater inlet chamber 39a in the one header 32 of the condenser 26 is cooled in the respective condensing heat transfer tubes 34 and in the other header 33. After flowing back toward the seawater outlet chamber 40a, it is discharged from the outlet 42 in the cooling seawater outlet chamber 40a, while a part of the cooling seawater in the cooling seawater outlet chamber 40a is parted by the partition plate 33a. It flows into the water supply inlet chamber 38a from the communication hole 43 provided in the.

The seawater thus flowing into the water supply inlet chamber 38a passes through the inside of each heat exchanger 35 for heating the water supply in the condenser 26 and the water outlet chamber 3 in the other header 33.
When flowing in a folded shape toward 8d, after being warmed by the high temperature steam generated in the first-stage vacuum evaporation chamber 21 (water supply heating), from the water supply outlet chamber 38d via the water supply conduit 45, It is supplied into the first-stage vacuum evaporation chamber 21, heated by the heater 23, and evaporated by boiling.

Also in this case, since the feed water can be heated by using a part of the heat transfer tubes 35 in the multi-tube condenser 26, the feed water heater is separated from the condenser as in the conventional case. It is possible to omit to secure a space for disposing it, and moreover, a part of the cooling seawater discharged from the condenser is provided in the partition plate 33a in the header 33 with the communication hole 43 formed therein. By being able to lead to the water supply through the pipe, it is possible to completely omit the pipe line for leading a part of the cooling seawater discharged from the condenser 26 to the water supply.

Although the above-described embodiments have been described with respect to the single-effect type and the double-effect type, the present invention is not limited to this, and it goes without saying that the same can be applied to other multi-effect types.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

5 is an enlarged sectional view taken along line VV of FIG.

FIG. 6 is a vertical sectional front view showing a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view taken along line VII-VII of FIG.

8 is an enlarged sectional view taken along line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IV of FIG.

10 is a cross-sectional view taken along line XX of FIG.

11 is a sectional view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII of FIG.

[Explanation of symbols]

 1,2,22 Vacuum evaporation chamber 2,23,24 Heater 4,26 Condenser 6,7,32,33 Header 5b, 34 Condensation heat transfer pipe 5a, 35 Feed water heating heat transfer pipe 6a, 7a, 32a, 33a Partition plate 11a, 39a Cooling seawater inlet chamber 12a, 40a Cooling seawater outlet chamber 10a, 38a Water supply inlet chamber 9a, 38d Water supply outlet chamber 17,43 Communication hole

Claims (1)

[Claims] 1. A vacuum evaporation chamber, a heater for seawater supplied into the vacuum evaporation chamber, and a multi-tube condenser for vapor generated in the vacuum evaporation chamber, and both ends of the condenser,
In a vacuum evaporation type water producing apparatus provided with a header for each heat transfer pipe in the condenser, in both headers in the condenser, the header is provided with an inlet chamber and an outlet chamber for cooling seawater and a large number of condensers. A partition plate that divides into a water supply inlet chamber and an outlet chamber that communicates with a part of the heat transfer pipes of the book is provided, and the water supply pipe line from the water supply outlet chamber is connected to the vacuum evaporation chamber. A vacuum evaporation type fresh water producing apparatus, characterized in that, while being connected, a partition plate between the cooling seawater outlet chamber and the water supply inlet chamber is provided with a communication hole that communicates between them.