JP2000140868A - Ozonized water supply device keeping fixed range concentration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the ozone concn. of ozonized water at a place where the ozonized water is used within a fixed range. SOLUTION: The ozonized water supplying device is provided with a raw water supplying system 1, a branched raw water system 2, a branched ozonized water production system 3, a resistive body 21, a laminar flow type flow limitter 32, an ozone dissolving tank 31, and an ozone generating device 4, etc. The resistance respectively proportional to squared flow rate and flow rate are generated at the resistive body 21 and the flow limitter 32, as a result, the flow rate of the laminar flow instrument 32 is reduced in proportion of the squared flow rate of the resistive body 21, and the concn. of the ozonized water passed through the ozone dissolving tank 31 is changed in inverse proportion to the flow rate, and the concn. of the ozonized water to be used is maintained in the range near to a fixed value finally. In this way, structure becomes simple, controlling and operation are eliminated and actuation is made sure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone water supply apparatus for supplying ozone water containing ozone, and more particularly to a technique for maintaining an ozone water concentration within a certain range.

[0002]

2. Description of the Related Art Ozone-dissolved water has a bactericidal activity, a deodorizing activity, an organic matter decomposing activity, etc., is extremely useful, and has no residual properties and can be used in the same manner as tap water. It is used for various applications. The concentration ranges from about 0.5 ppm to about 30 ppm depending on the application. On the other hand, as an ozone generator for producing ozone water, a device capable of generating ozone gas having a high concentration is desirable. As such an ozone generator, an electrolytic type is preferable, but improvement of the oxygen generator and the electrode structure itself has made it possible to generate a certain high-concentration ozone gas even in a silent discharge type device in recent years. Therefore, such a device may be used.

[0003] As a method of dissolving ozone gas in water, there are known an ejector method and a method using an air-mixing pump. In this case, if the concentration of ozone gas is increased to increase the solubility in water, the saturation solubility can be increased to about 40 ppm. In such a case, it is easy to bring a certain amount of water into contact with a certain amount of ozone gas to supply, for example, 1 ppm of ozone water, but in such a case, the amount of ozone water used decreases. Then, there is a problem that the ozone concentration increases to 4 to 5 ppm and becomes excessive, which is inconvenient for use.

[0004]

In order to solve such a problem, it is conceivable to measure the dissolved ozone concentration and control the amount of ozone gas generated by the ozone generator to automatically decrease. Such a device has a problem that the configuration is complicated and the cost is high. Therefore, an object of the present invention is to provide an ozone water supply device that can operate reliably with a simple configuration and can maintain the ozone concentration within a practically feasible fixed range.

[0005]

According to the present invention, there is provided an ozone water supply apparatus for supplying ozone water containing ozone, comprising: a raw material water for supplying water for producing the ozone water; A supply system, a branch raw material water system and a branch ozone water production system which are merged again after being branched therefrom to become the ozone water, and a first system which is provided in the branch raw material water system and which generates a passage resistance proportional to approximately the square of the flow rate. A flow restrictor, an ozone dissolving tank provided in the branch ozone water producing system, a second flow restrictor for generating a passage resistance proportional to a first power of the flow, and ozone for supplying high-concentration ozone to the ozone dissolving tank. And a generator.

[0006]

FIG. 1 shows an example of the configuration of an ozone water supply apparatus to which the present invention is applied. The apparatus comprises a raw water supply system 1 for supplying water for producing ozone water, a branched raw water system 2 for supplying ozone water for final use which is branched and then joined again, and a branched ozone water production system 3, Resistor 2 as first flow rate limiting means provided in branch raw material water system 2
1. Ozone dissolution tank 3 provided in branch ozone water production system 3
It has a laminar flow restrictor (hereinafter abbreviated as “laminar flow device”) 32 as the first and second flow restricting means, an electrolytic ozone generator 4, and the like.

The raw water supply system 1 may usually be a tap water line.
In this example, the pressure reducing valve 11 and the check valve 1 are used for convenience.
2, and the pressure on the downstream side is maintained at 1 kgf / cm ² G. At the supply destination of the ozone water, four faucets 51 to 54 are provided so that the ozone water can be used at a plurality of places.

The resistor 21 is constituted by an orifice, a Venturi tube or the like which generates a passage resistance proportional to the square of the flow rate. In this example, the rated flow rate is 60 liters per minute (60 L / mim) and the pressure loss at that time is 0.3 kgf / cm.
^Two things are used.

The laminar flow device 32 has a structure that generates a passage resistance that is approximately proportional to the first power of the flow rate. In this embodiment, the laminar flow filter 32 is a sintered stainless powder filter having an element having a diameter of 20 mm and a height of 100 mm. This filter has a rated flow rate of 3 L / mim, a differential pressure of 0.3 kgf / cm ² , and a nominal filtration accuracy of 2 μm. According to such a laminar flow device 32, the resistance ΔP is represented by a known formula ΔP = λ (L / d)
(Γv ² / 2g), in which the pipe friction coefficient λ is approximately 64 / Re when the flow is laminar, and Re is ρv
Since d / μ, ΔP∝v, that is, the resistance, is eventually proportional to the first power of the flow rate. In addition, as such a laminar flow device, any material such as a large number of capillary tubes, a honeycomb formed body, or a sintered body can be used as long as the flow becomes laminar and an appropriate differential pressure can be formed.

Although not shown in detail, the electrolytic ozone generator 4 has a main body in which an anode and a cathode are disposed with an ion exchange membrane made of a solid polymer electrolyte membrane interposed therebetween and a gas for storing pure water and the like. A liquid-liquid separation tank, and circulating pure water between the main body and the gas-liquid separation tank, while mixing oxygen-generated gas generated by electrolysis and ozone gas contained therein at a high concentration in the gas-liquid separation tank. It has a normal structure that is configured to be separated from pure water and taken out. Thereby, high-concentration ozone of about 200 g / Nm ³ or more can be supplied to the ozone dissolving tank 31. Note that, depending on the use of the ozone water, a silent discharge type ozone generator can also be used.

The ozone dissolving tank 31 introduces high-concentration ozone gas generated by the ozone generator 4 and supplies it to the pressure reducing valve 1.
1 is a 1 kgf / cm ² G by bubbling further laminar flow 32 within the vessel that is a 0.7 kgf / cm ² G of about or more pressure after being granted primary resistance, by dissolving a raw material water Produce high concentration branched ozone water. At the top of the ozone dissolving tank 31, a float-type gas-liquid separator 31a for automatic degassing and a waste ozone decomposer 31b for decomposing ozone remaining in the exhaust gas are provided.

FIG. 2 shows an example of the relationship between the flow rate of such an ozone dissolving tank and the solubility, that is, the concentration of ozone water. Generally, the ozone dissolution tank has a characteristic that the concentration of ozone water becomes low when the flow rate of the introduced raw water is large, and the ozone water concentration becomes high when the flow rate is small. In this example,
When the dissolved ozone gas concentration is 220 g / Nm ³ , the flow rate of the raw water is increased from 1 (100%) to 1
When it is changed to the minimum 1/16 through / 4, it changes from 8 ppm to about 36 ppm through 24 ppm. In addition,
In the figure, the values when the maximum amount is 3 L / mim and 6 L / mim are also displayed.

In the above-described ozone water supply apparatus, the ozone water concentration when the number of taps 51 to 54 used is changed according to the amount of ozone water to be used is calculated by the following equation. That is, the branched raw material water system 2 and the branched ozone water production system 3
Are respectively Q and q, the resistor 21 and the laminar flow device 32
Are the same resistance, ΔP, the concentration of the branch ozone water flow rate q and the concentration of the used ozone water flow rate (Q + q) after merging are d and D, respectively, and the rated values of Q and q are Q ₀ and q ₀ , If the common pressure loss at this time is P ₀ , ΔP = AQ ² , where A = P ₀ / Q ₀ ² ΔP = Bq, where B = P ₀ / q _{0, and} therefore q = Q ² q ₀ / Q ₀ ² −− d = f (q) −−−−−− D = dq / (Q + q) −−

Table 1 exemplarily summarizes the maintenance characteristics of the used ozone water concentration D according to the present invention according to the above formula for easy understanding. That is, in a normal use condition of ozone water, D is sufficiently smaller than d, so that q is often sufficiently smaller than Q. In this table, based on Q, this is ｑ and の of Q _0. , That is, a calculation example when the number of used taps is reduced from four used states to almost two and one used states. From the characteristics of the above equation, even when q becomes considerably large, Q or (Q +
The change tendency of the used ozone concentration D when q) is changed becomes the same.

[0015]

[Table 1]

Tables 2 and 3 show that Q ₀ = 60 L / mim, q ₀ = 3 L / mim and 6 L / mi in the above formulas, respectively.
m, when pressure loss P ₀ = 0.3 kgf / cm ² in these cases, ΔP = AQ ² , where A = 0.3 / 602 ² ΔP = Bq, where B = 0.3 / 3 and 0.3 / 6 Thus, a table of calculation of the D or the like in the formula of the numerical example where q = Q ^2/1200 and Q ^2/600 ----- '.

[0017]

[Table 2]

[0018]

[Table 3]

According to these calculation results, q is proportional to the square of Q, where q is a proportional constant and q ₀ / Q ₀ ^2.
When に or １ ／, q becomes １ ／ or 1/16, and d changes in inverse proportion to q, so that q becomes １ ／ or 1/16 as shown in FIG. If d is 3 or 4
5 times and D is approximately proportional to d, q and 1 / Q, so if Q goes from 1 to 1/2 or 1/4, then D
Is from 1 to approximately 3/2 = 1.5 or 4.5 / 4 = 1.12.
5, which means that the density can be maintained within a practically acceptable range. In addition, such used ozone water concentration D is slightly different depending on the characteristics of the ozone dissolving tank,
Even in such a case, D can be maintained in a practically usable concentration range.

Therefore, according to such an ozone water supply apparatus, in various use states of the faucets 51 to 54, the concentration of the used ozone water can be reduced to 1 without any control or operation.
It can be reduced to about 1.5 times, for example, about 0.4 ppm to 0.6 ppm or about 0.8 ppm to 1.2 ppm, which is extremely convenient for practical use.

[0021]

As described above, according to the present invention, a branched raw water system and a branched ozone water production system which are branched from the raw water supply system and merged again are provided, each of which generates a passage resistance proportional to the square of the flow rate. A first flow restrictor for controlling the flow rate and a second flow restrictor for generating a passage resistance in proportion to the first power of the flow rate. Since the pressure loss of the branch raw water system and the branch ozone water production system are the same, the flow rate of the branch ozone water production system is proportional to the square of the flow rate of the branch raw water system, so that the water is produced. Since the concentration of ozone water changes in inverse proportion to the amount of water, and the concentration of used ozone water after merging is proportional to the flow rate of the branch ozone water production system and the ozone water concentration and almost inversely proportional to the flow rate of the branch raw water system, it is eventually used. Even Zon water is changed can be maintained in viable a range of change of the ozone concentration.

As a result, the concentration of ozone water to be used can be maintained within a certain range under reliable operation without control or operation, and a simple, inexpensive, highly practical and convenient ozone water supply device can be provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of an ozone water supply device to which the present invention is applied.

FIG. 2 is a curve diagram showing an example of characteristics of an ozone dissolving tank applicable to the above apparatus.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 raw water supply system 2 branch raw water system 3 branch ozone water production system 4 ozone generator 21 resistor (first flow restrictor) 31 ozone dissolving tank 32 laminar flow, laminar flow restrictor (second flow restrictor) )

Claims (1)

[Claims] 1. An ozone water supply apparatus for supplying ozone water containing ozone, comprising: a raw water supply system for supplying water for producing the ozone water; A branch raw material water system and a branched ozone water production system that become water, a first flow restrictor that is provided in the branch raw material water system and generates a passage resistance that is approximately proportional to the square of the flow rate, and is provided in the branch ozone water production system. An ozone water supply device, comprising: an ozone dissolution tank and a second flow restrictor for generating a passage resistance proportional to a first power of the flow rate; and an ozone generator for supplying high-concentration ozone to the ozone dissolution tank. .