JPH08242811A - Production of common salt water and apparatus therefor - Google Patents

Abstract

PURPOSE: To continuously provide common salt water having desired concentration. CONSTITUTION: This method for producing common salt water comprises successively permeating pure water into a laminate of common salt independently arranged in rows by a head water pressure, successively increasing concentration of permeated water, finally creating saturated common salt, mixing the saturated common salt with pure water in a proper ratio to provide common salt water having desired concentration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a saline solution for continuously producing a saline solution having a desired concentration.

[0002]

2. Description of the Related Art Conventionally, an apparatus for producing salt water is used in which a sufficient amount of salt is piled up in a salt dissolution tank to form a salt layer, and fresh water is permeated from the lower portion to the upper portion of the salt layer. In addition, a salt dissolving device equipped with a concentration measuring device, a liquid level gauge, and the like, and an automatic control device thereof has also been proposed (Japanese Utility Model Publication No. 4-81639).

[0003]

The above-mentioned conventional device has problems in that the dissolution efficiency is improved and the salt concentration is regulated (accuracy is maintained).

That is, since fresh water permeates the salt layer only once, it is necessary not only to take a sufficient time to make it into a saturated salt solution, but also when it does not become a saturated salt solution, the concentration of the salt solution used. Was difficult to regulate to the required concentration, and there was a risk that the precision of the concentration would inevitably decrease.

[0005]

However, according to the present invention, since a plurality of salt layers can pass the fresh water having a predetermined head pressure sequentially, the salt solution passing through each salt layer has a substantially constant concentration. Saturated saline can be easily produced continuously.

[0006] That is, the invention of the method is to sequentially pass fresh water through head water pressure through a stack of common and independent salt solutions,
A method for producing a saline solution characterized in that the concentration of permeated water is gradually increased to finally make a saturated saline solution, and the saturated saline solution and fresh water are mixed at an appropriate ratio to obtain a saline solution having a desired concentration. The method is characterized by allowing clear water to permeate from below to above the salt stack.

In the invention of the apparatus, a fresh water tank, a plurality of dissolving tanks for providing a salt layer and a saturated tank for storing saturated saline are installed in parallel, and a lower connecting pipe is provided between the lower portion of the fresh water tank and the lower portion of the first dissolving tank. , The upper part of the first melting tank and the lower part of the second melting tank are connected by the first communication pipe, and the upper parts of the second and subsequent melting tanks and the lower part of the next-stage melting tank are connected by the communication pipe. Then, the upper part of the final stage dissolution tank and the upper part of the saturation tank are connected by an upper connection pipe via a valve, the base of the discharge pipe is connected to the side wall of the saturation tank, and a salt water pump is interposed in the discharge pipe, In the salt water producing apparatus, a fresh water pipe having a fresh water pump interposed is connected to a tip portion of the discharge pipe. Next, a flow control valve, a fresh water tank and an automatic valve for controlling the water level in the saturation tank are provided in the upper connecting pipe, and the permeation rate is set to 0.5 at the cross section of the dissolution tank by the flow control valve.
It is adjusted to cm / sec to 2 cm / sec. The water level of the first-stage fresh water tank and the dissolution tank and the outlet of the next-stage dissolution tank can be set when the permeation speed in the cross-section of the dissolution tank is set to a desired speed so that saturated saline can be obtained in the final dissolution tank. The difference is larger than the difference in water level.

It goes without saying that the salt layer of the device may be two layers or four layers.

In any case, a predetermined dissolution rate (for example, 60
%, 30%, 10%) and the final concentration is saturated saline, and the efficiency can be improved by using multiple stages.

Further, the cross-sectional shape, cross-sectional area, salt layer thickness, head pressure and the like of the plurality of dissolution layers may not be constant and are determined according to the purpose of production and the capacity.

[0011]

According to the present invention, since a plurality of salt layers are sequentially permeated, it is possible to efficiently increase the concentration and continuously produce saturated saline solution. Therefore, it is easy to produce a saline solution having an arbitrary concentration. Moreover, the accuracy of the concentration can be kept high.

[0012]

Embodiment 1 An embodiment of the present invention will be described with reference to FIG.

The lower portion of the second fresh water tank 1 and the lower portion of the first melting tank 2 are connected by a lower connecting pipe 3, and the upper portion of the first melting tank 2 and the lower portion of the second melting tank 4 are connected by a first communicating pipe. 6 to connect the upper portion of the second melting tank 4 and the lower portion of the third melting tank 5 to the second
Connected by a communication pipe 7, the upper part of the third melting tank 5 and the saturation tank 8
And the upper part of the are connected by the upper connecting pipe 9. The saturation tank 8
The base of the discharge pipe 10 is connected to the side wall of the
The stop valve 28 and the salt water pump 11 are provided at 0, and the tip of the discharge pipe 10 is connected to the tip of a fresh water pipe 13 that is provided with a fresh water pump 12. A first fresh water tank 1a is arranged in parallel in the second fresh water tank 1, an automatic valve 15a is interposed in a water supply pipe 14a of the first fresh water tank 1a, and a float 16a floats on the water surface.

A fresh water pipe 13 is connected to the first fresh water tank 1a, and an automatic valve 15 is interposed in a water supply pipe 14 above the second fresh water tank, and a float 16 of the automatic valve 15 is provided.
Is floating on the surface 17 of fresh water. In the figure, 18 and 19 are thermometers, 20, 21 and 22 are undissolved salt sensors, and 23 is a lower limit level sensor.

A flow rate adjusting valve 24 and an automatic valve 25 are interposed in the upper connecting pipe 9, and the automatic valve 25
The float 26 is floated on the water surface 27 of the saturation tank 8.

The base of the fresh water pipe 13 is the first fresh water tank 1
It is connected to the upper part of a and a stop valve 28 is interposed. In the figure, 29 is a drain valve.

In the above-mentioned embodiment, the fresh water in the fresh water tank 1 descends as shown by the arrow 30, passes through the salt layer 32 as shown by the arrow 31, and accumulates in the upper portion of the first dissolution tank 2 as the saline solution 33. . This salt solution 33 is passed by the head H ₁ through the first communication pipe 6 as shown by the arrow 34 and permeates the inside of the salt layer 35 as shown by the arrow 36, and is sent to the upper part of the second dissolution tank 4. 37
Collect as. Then, this salt solution 37 is passed by the head H ₂ through the second communication pipe 7 as shown by the arrow 37 and permeates the salt layer 39 as shown by the arrow 38, and is passed to the upper portion of the third dissolution tank 5 as saturated salt solution 40. Collect. The saturated saline solution 40 passes through the upper connecting pipe 9 by the head H _{3 as} indicated by an arrow 41, and is stored in the saturated tank 8.

Next, when salt water is used, the amount of water to be sent to the salt water pump 11 and the fresh water pump 12 is regulated according to the concentration thereof. For example, if the amount of water sent by the salt water pump 11 is constant and the amount of water sent by the fresh water pump 12 is variable, saline water of any concentration can be supplied from the mixing pipe 42 as indicated by arrow 43 depending on the amount of water sent by the fresh water pump 12. Can be sent to the place of use.

In the above, when the water level in the saturation tank 8 drops, the automatic valve 25 opens to replenish the salt water, so that the salt water level in the saturation tank 8 is always constant, and the amount of water sent by the salt water pump 11 is kept constant. Can be kept constant.

When salt is deposited in the saturation tank 8, the drain valve 29 is opened and the salt is discharged as indicated by the arrow 44.

[0021] Then when the water level of the second clean-fluid tank 1 has dropped, is water automatic valve 15 is opened, because it holds the water level constant at all times, the head H ₁ in each tank,
H ₂ and H ₃ are always kept constant. Therefore, each salt layer 3
Since the flow rate of salt water passing through 2, 35 and 39 is kept constant, the solubility (and therefore salt water concentration) in each dissolution tank is kept in a certain range unless the thickness of the salt layer changes significantly.
Saturated saline solution can be easily and reliably continuously produced automatically. In addition, the first fresh water tank 1a also keeps its water level constant by the automatic valve 15a.

In FIG. 2, the head pressure of each part is H ₁ >
_{h 1, H 2> h 2} , H 3> such that h _3, H _1, H
_{2 It} is good to take the head of H ₃ .

Further, the fresh water tank is provided with a first and a second.
A fresh water pipe 13 is connected to the fresh water tank 1a.

In this embodiment, for example, 50 to 70% is dissolved in the first dissolution tank, 20 to 40% is dissolved in the second dissolution tank, and 0 to 30% is dissolved in the third dissolution tank to form a saturated saline solution.

[0025]

[Embodiment 2] In the embodiment of FIGS. 3 and 4, the large tank 45 is partitioned by partition plates 46, 47, 48 and 49, and a fresh water tank 1, a first melting tank 2, a second melting tank 4, and a third melting tank are used. 5, the saturation tank 8 is constituted, and each tank is connected to the lower connection pipe 3, the first communication pipe 6, and the second
They are connected by a communication pipe 7 and an upper connection pipe 9, respectively. The parts corresponding to those of the first embodiment are designated by the same reference numerals.

Therefore, the manufacturing process of the saline solution is the same as that of the first embodiment (however, there is no first fresh water tank), so that the explanation of the use example is omitted.

[0027]

EFFECTS OF THE INVENTION According to the present invention, since the high-concentration saline solution is successively dissolved in a plurality of dissolution tanks, it is possible to continuously and reasonably and efficiently produce highly concentrated saline solution. There is.

However, since the adjustment of the concentration may be performed only by controlling the fresh water pump, the operation can be fully automated.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an apparatus for carrying out the present invention.

FIG. 2 is a schematic cross-sectional view when the water level is also changed.

FIG. 3 is a plan view of another embodiment of the same.

FIG. 4 is a front view of the same.

[Explanation of symbols]

 1 2nd fresh water tank 1a 1st fresh water tank 2 1st dissolution tank 3 Lower connection pipe 4 2nd dissolution tank 5 3rd dissolution tank 6 1st communication pipe 7 2nd communication pipe 8 Saturation tank 9 Upper connection pipe 10 Discharge pipe 11 Salt water pump 12 Fresh water pump 13 Fresh water pipe 14, 14a Water supply pipe 15, 15a Automatic valve 16, 16a Float 17 Water surface 18, 19 Thermometer 20, 21, 22 Undissolved salt sensor 23 Lower limit level sensor 24 Flow control valve 25 Automatic valve 26 Float 27 Water surface 28 Stop valve 32, 35, 39 Salt layer

Claims (5)

[Claims] 1. A saturated saline solution is finally produced by sequentially permeating fresh water with head water pressure into a stack of independently parallel salt solutions to finally produce saturated saline solution. A method for producing a saline solution, characterized by mixing and with an appropriate ratio to obtain a saline solution having a desired concentration. 2. The method for producing a saline solution according to claim 1, wherein the fresh water is permeated from the lower side to the upper side of the layered salt solution. 3. A fresh water tank, a plurality of dissolution tanks provided with a salt layer, and a saturated tank for storing saturated saline are installed in parallel,
The lower part of the fresh water tank and the lower part of the first melting tank are connected by a lower connecting pipe, and the upper part of the first melting tank and the lower part of the second melting tank are
Connect with the connecting pipe, connect the upper part of the first-stage melting tank and the lower part of the next-stage melting tank with the communicating pipe from the second melting tank onwards, and connect the upper part of the last-stage melting tank and the upper part of the saturation tank with the upper connecting pipe via the valve. The base of the discharge pipe is connected to the side wall of the saturation tank, the salt water pump is interposed in the discharge pipe, and the fresh water pipe in which the fresh water pump is interposed is connected to the tip of the discharge pipe. Saline production equipment. 4. The upper connecting pipe is provided with a flow rate control valve and an automatic valve for controlling the water levels of the fresh water tank and the saturation tank, and the flow rate control valve has a permeation rate of 0.5 c in the cross-section of the dissolution tank.
The apparatus for producing saline solution according to claim 3, wherein the apparatus is adjusted to m / sec to 2 cm / sec. 5. The water levels of the first-stage fresh water tank and the dissolution tank and the outlet of the second-stage dissolution tank are set so that the permeation rate in the cross-section of the dissolution tank is desired so that saturated saline can be obtained in the final dissolution tank. 4. The apparatus for producing saline solution according to claim 3, wherein a difference larger than a difference in water level generated at speed is provided.