JPH0154112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a distilled water production apparatus having a plurality of distillers.

BACKGROUND OF THE INVENTION Distilled water production apparatuses employ various methods to efficiently obtain the desired high-purity distilled water. In particular, the evaporated steam contains a mist of raw water that accompanies the steam, and this mist must be sufficiently separated and removed. Various methods are used for mist separation not only in distilled water production equipment but also in various equipment such as ordinary evaporation equipment and wet scrubbers.

For example, the lower part of the distillation can is made of triple shells, and a spiral guide is provided to swirl the steam in the annular space between the innermost shell and the intermediate shell, and the separated mist is removed between the middle shell and the outer shell. In another example, there is a method in which a spiral guide is provided in an annular flow path made up of a double barrel, and a demister is further installed above the annular flow path.
In addition, in order to recover the heat of the high-temperature distilled water obtained in one stage, there is a method in which the distilled water is supplied to the heating side of the distillation can in the next stage and flash evaporated.

In these conventional examples, the mist separation mechanism is complicated, and the pipe for the obtained high-purity pure water is structured so that it penetrates the part where dirty raw water exists. There is a risk of being contaminated by the raw water.

Means for Solving the Problems In the present invention, no structure is provided in the annular passage formed by the lower heating side shell and the evaporating part shell in the evaporator, and steam flows through the annular passage. In the meantime, most of the water droplets with relatively large particle sizes entrained in the steam are removed by gravity settling, and the remaining steam containing relatively small water droplets is sent to the next stage distiller. The water is allowed to flow tangentially into an annular flow path formed by an upper heated shell and an inner jacket with a closed lower part, and centrifugal force is applied to the entrained water droplets to separate them.

Further, a space is provided between the isolation dividing the upper heating side shell and the lower evaporation part shell of the distiller and the inner mantle with a closed bottom provided inside the upper heating side shell, By introducing the high-temperature distilled water obtained in the previous stage into the space and flash-evaporating it, the distilled water does not penetrate the area where contaminated raw water is present, thereby avoiding the cause of contamination.

Embodiment FIG. 1 shows a part of a distilled water production apparatus according to the present invention, that is, a distiller 10' at the (k-1) stage of a plurality of distillers and a distiller 10 at the k-th stage of the next stage.
10 and 10' have the same configuration.

To explain the figures, 11 is an upper heating side shell, 12 is a lower heating side shell, 13 is an evaporation section shell, 14 is a heat transfer tube, and 15 is an upper heating side shell 11.
and a partition wall 16 that divides the evaporation section shell 13 into
1 is an inner mantle whose lower part is closed; 17 is an annular flow path formed by the upper heating side shell 11 and the inner mantle 16;
8 is a heating chamber, 19 is a heat exchanger tube 14 for supplying raw water.
a dispersion chamber for forming a thin film on the inner wall of the heat exchanger tube 14; 20 is a spouting section from which the raw water and steam boiled within the heat transfer tube 14 is spouted; 21 is formed by the evaporating section shell 13 and the lower heating side shell 12. an annular steam flow path; 22 is an opening provided at the top of the inner mantle 16;
23 is a space provided between the inner mantle 16 and the partition wall 15, the lower part of which is closed. Note that the upper heating side shell 11 and the evaporator shell 13 are designed to have approximately the same diameter, and similarly, the inner mantle 16 and the lower heating side shell 12 are designed to have approximately the same diameter.

Furthermore, 31 is a raw water supply pipe that supplies the liquid to be distilled, that is, raw water, to the distiller 10, 32 is a residual raw water discharge pipe that discharges the remaining raw water after the raw water has evaporated, and 33 is a previous stage (k-1 stage, 10 The steam inlet pipe 34 containing some water droplets supplied from the steam inlet pipe 34 swirls in the annular flow path 17, and the water droplets are separated by centrifugal force.
A distilled water outlet pipe 35 discharges high-purity condensed water, that is, high-purity distilled water, which becomes substantially high-purity steam and enters the heating chamber 18 through the opening 22 and is condensed in the heat transfer tube 14; Steam containing some water supplied from the pipe 33 flows through the annular flow path 17.
a separated water outlet pipe for discharging water separated by centrifugal force obtained by flowing tangentially into the water;
36 is a distilled water inlet pipe that is supplied for the purpose of recovering heat from the distilled water obtained in the previous stage.

FIG. 2 is a view taken along the line A-A in FIG. 1, showing a state in which the steam inlet pipe 33 flows tangentially into the annular flow path formed by the upper heating side shell 11 and the inner mantle. This shows the state in which

The water to be distilled, that is, the raw water, is supplied to the raw water supply pipe 3.
1 to the top of the k stage still 10 by means of a pressure difference. The supplied raw water is dispersed in the dispersion chamber 19 so that the amount of water is approximately equal to each heat exchanger tube 14 and so as to form a thin film on the inner wall of the heat exchanger tube 14. The raw water that has formed a thin film on the inner wall of the heat transfer tube 14 flows downward due to gravity and the downward flow of partially evaporated steam. The raw water flowing down the inner wall of the heat exchanger tube 14 in a thin film is heated by the heated steam entering the outside of the heat exchanger tube 14, that is, the heating chamber 18, and boils and evaporates.

The boiled and evaporated water vapor and the remaining raw water are transferred to the heat transfer tube 14
The remaining raw water is ejected from the lower end to the spouting part 20, and most of the remaining raw water is collected at the bottom of the spouting part 20, and is supplied to the next stage distiller on the low pressure side via the residual raw water discharge pipe 32 due to the pressure difference. be done. In the case of the final stage distiller, it is blown down outside the system.

The steam from which most of the raw water has been separated is transferred to the annular flow path 2.
1 flows upward. The steam flowing through this annular flow path 21 contains water droplets, but since the cross-sectional area of the annular flow path is sufficiently large, the relatively large water droplets are pushed downward by gravity against the upward flow of steam. Water droplets of relatively small size that do not fall are sent together with steam from the steam outlet pipe 33' to the next stage distiller. This relationship is similar to the relationship between distillers 10' and 10 in the figure.
That is, the steam containing some water droplets flowing into the distiller 10 flows tangentially into the annular flow path 17 from the steam inlet pipe 33 at a high speed, and swirls at a high speed within the annular flow path 17 upward. The remaining water droplets are separated by centrifugal force. The separated water droplets collide with the inner wall of the upper heating side shell 11, collect, flow downward due to gravity, reach the lower part of the inner mantle 16 whose lower part is closed, and connect the inner mantle 16 and the upper heating chamber 11.
The separated water is discharged from the separated water outlet pipe 35 provided at the bottom part connected to the water. On the other hand, the water droplets are separated and the steam, which has become substantially highly pure, is transferred to the inner mantle 16.
heating chamber 1 through an opening 22 provided at the top of the
8 and heats the raw water flowing down the inner wall of the heat transfer tube 14. The heated steam is therefore condensed and becomes condensed water, ie distilled water. This distilled water flows downward along the outer wall of the heat transfer tube 14, passes through a distilled water outlet pipe 34 provided at the bottom of the heating chamber 18, and is sent to the next stage distiller on the low pressure side due to the pressure difference.

The distiller in the next stage has the same configuration as the distiller 10 shown in the figure, and the distiller 10' in the previous stage and the distiller 10 in the previous stage.
The relationship is similar to that of . The end of the distilled water outlet pipe 34 becomes an inlet pipe 36, and the distilled water flows into the next distiller. The distilled water inlet pipe 36 is connected to the inner sleeve 1 whose lower part is closed.
6 and the partition wall 15.
The high-temperature distilled water from the previous stage flows into the space 23 in a gas-liquid two-layer flow state. The gas phase portion of this gas-liquid two-layer flow, that is, water vapor, gives heat to the heat transfer tube 14 in the same way as the high-purity water vapor described above, and condenses itself to become distilled water. On the other hand, the liquid phase, ie distilled water, reaches the bottom of the heating chamber 18.

Although the illustrated embodiment shows a case with multiple stages, the distiller of the present invention can be used with either a single stage or multiple stages.

Effects The distiller of this invention has such a configuration,
A space is provided between the partition wall and the inner mantle with a closed bottom,
Since the distilled water inlet pipe is directly connected to the body of the space, there is no need for a complicated structure. Also, contamination is avoided.

In addition, since multi-stage distilled water production equipment is installed indoors, installation space is limited, so it must be made as compact as possible.
Since the upper heating side shell and the evaporation part shell, as well as the inner mantle and the lower heating side shell, have the same diameter, miniaturization is possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure and relationship of a multi-stage distiller according to the present invention, and FIG. 2 is a view taken along the line A--B in FIG. 1. Explanation of symbols, 10, 10'... distiller, 11...
... Upper heating side shell, 12 ... Lower heating side shell, 13 ... Evaporation section shell, 14 ... Heat exchanger tube, 1
5... Partition wall, 16... Inner mantle, 17... Upper annular channel, 18... Heating chamber, 19... Dispersion chamber, 20...
Spout part, 21... Lower annular flow path, 22... Opening, 23... Space, 31... Raw water supply pipe, 32
...Remaining raw water discharge pipe, 33...Steam inlet pipe, 34...
... Distilled water outlet pipe, 35 ... Separated water outlet pipe, 36...
…Distilled water inlet pipe.

Claims (1)

[Scope of Claims] 1. A heating chamber for heating and boiling raw water, a dispersion chamber for forming raw water into a thin film on the inner wall of a heat transfer tube, a supply pipe for introducing raw water, raw water flowing down the inner wall, and steam at the center of the tube. At least one heat transfer tube that flows downward, a jet of boiling raw water and steam, a discharge pipe that discharges the remaining raw water, and the steam introduced from the previous stage distiller is condensed. a distilled water outlet pipe for discharging the distilled water obtained by the process, a steam inlet pipe for introducing steam mixed with some water droplets in the tangential direction of the upper heating shell, and a separated water outlet for discharging the water separated from the steam. A distilled water inlet pipe that introduces distilled water sent from the distiller in the previous stage, and a steam outlet pipe that discharges evaporated steam.
In a thin film falling type distiller, the distiller is divided into an upper heating side shell and a lower heating side shell by isolation, and an evaporation part shell is provided outside the lower heating side shell, so that the lower annular shape of the vapor is separated. A flow path is formed, and an inner mantle is further provided inside the upper heating side shell, and a lower part of the inner mantle is connected to the upper heating side shell to form a closed bottom structure. distiller. 2. A space is provided between the inner mantle whose lower part is closed and the partition wall, and a distilled water inlet pipe for introducing distilled water from the previous stage flows into the space. A distiller according to claim 1. 3. The connection position of the steam inlet pipe that flows tangentially into the upper annular flow path constituted by the upper heating side shell and the inner mantle with a closed bottom is the connection point of the separated water outlet pipe that discharges the separated water. A distiller according to claim 1, characterized in that it is located in the upper part. 4. The diameter of the upper heating side shell forming the upper annular flow path and the diameter of the evaporation part shell forming the lower annular flow path are approximately the same size, as set forth in claim 1. distiller. 5. Claim 1, characterized in that the diameter of the lower-closed inner mantle constituting the upper annular flow passage and the diameter of the lower heating side shell constituting the lower annular flow passage are approximately the same size. Distiller as described in section. 6 A heating chamber that heats and boils raw water, a dispersion chamber that forms raw water into a thin film on the inner wall of the heat transfer tube, a supply pipe that introduces raw water, raw water flows down the inner wall, and steam also flows downward in the center. At least one heat transfer tube containing boiling raw water and steam, a discharge pipe for discharging the remaining raw water, and distilled water obtained by condensing the steam introduced from the previous stage distiller. a steam inlet pipe that introduces steam mixed with some water droplets in the tangential direction of the upper heating shell; a separated water outlet pipe that discharges water separated from the steam; It is equipped with a distilled water inlet pipe that introduces distilled water sent from the stage still, and a steam outlet pipe that discharges evaporated steam.
An upper heating side shell and a lower heating side shell of the distiller are divided by a partition wall, and an evaporation part shell is provided outside the lower heating side shell, thereby forming a lower annular passage for steam, and further An inner mantle is provided inside the upper heating side shell, and the lower part of the inner mantle is connected to the upper heating side shell to form a closed bottom structure. A distiller characterized by being connected in stages.