KR20210157937A - Apparatus for manufacturing total residual oxidant with high concentration - Google Patents

Abstract

The present invention relates to an apparatus for producing total residual oxidant (TRO) with high concentration including: an electrolysis tank having an inlet pipe through which sample water to be subjected to an electrolysis treatment is introduced is connected to an upper portion of one side thereof, and an outlet pipe through which electrolyzed treated water is discharged is connected to a lower portion of the other side thereof, and an air vent provided on an upper portion thereof; an electrode arrangement including a plurality of electrodes spaced apart from each other at a predetermined distance in the electrolysis tank, and electrolyzing the sample water to generate TRO when a current is applied; a rectifier provided on one side of the electrolysis tank and supplying the current to the electrode arrangement; and an air injector disposed under the electrode arrangement and spraying air toward the electrode arrangement, and the apparatus can perform functions of hydrogen concentration dilution, electrode descaling, cooling inside the electrolysis tank, and TRO dispersion, without using blowers, heat exchangers, agitators, etc.

Description

Apparatus for manufacturing total residual oxidant with high concentration

The present invention relates to a high-concentration TRO manufacturing apparatus for producing TRO having sterilizing power by electrolyzing water.

In general, TRO (Total Residual Oxidant) or residual oxide (residual chlorine) is used as a disinfectant to kill microorganisms, putrefactive bacteria or pathogens, etc. , water purification plants, sewage treatment plants, facilities of general chemical plants, swimming pools, etc. are widely used in various workplaces.

Such TRO or residual chlorine can be obtained by electrolysis of water containing sodium chloride (NaCl), for example, seawater. When water having a certain sodium chloride concentration is passed between the negative and positive plates of the electrolysis device, chlorine ions (Cl-) are oxidized to chlorine (Cl2) at the positive electrode, and sodium ions (Na+) are reduced at the negative electrode to reduce sodium (Na ) becomes Reduced sodium (Na) reacts with water (H2O) to generate sodium hydroxide (NaOH) and hydrogen (H2). Chlorine (Cl2) generated at the anode and sodium hydroxide (NaOH) generated at the cathode react Sodium chlorate (NaOCl), or TRO, is produced.

However, the above-described electrolysis apparatus has the following problems when generating a high concentration of TRO or residual chlorine.

1. Hydrogen generation problem by electrolysis

Sodium (Na) reduced in the electrolysis process reacts with water (H2O) to generate sodium hydroxide (NaOH) and hydrogen (H2). Since the generated hydrogen has a risk of explosion, the air provided at the top of the electrolysis device It must be discharged through an air vent. At this time, in the case of natural discharge, since there is a possibility that hydrogen gas is concentrated above the LEL (Lower Explosion Limit), it is necessary to discharge hydrogen by forcibly injecting air or nitrogen with a blower or the like.

2. Electrode scale adhesion problem

When water is electrolyzed, foreign substances such as calcium and magnesium, that is, scale are attached to the electrode. Since such scale causes a decrease in electrolysis efficiency, it is necessary to periodically wash the electrode or apply a strong flow of water to the electrode to prevent scale adhesion.

3. The problem of heat generation due to current flow

In order to electrolyze water, it is necessary to supply a large amount of current, which causes the temperature of water in the electrolyzer of the electrolysis device to rise. The temperature rise of this water rapidly degrades the generated TRO or residual chlorine. In addition, high temperature water accelerates corrosion of components such as housings and piping. Therefore, it is necessary to cool the water inside the electrolyzer by using a separate heat exchanger or the like in order to prevent the temperature rise of the water.

4. Stirring Problems for TRO Dispersion

Since TRO generated by electrolysis is maintained at a high concentration only around the electrodes in the electrolysis cell, a separate stirring mechanism must be used so that the TRO inside the electrolysis cell has an even concentration as a whole through stirring.

As described above, the conventional electrolysis apparatus had to have a complicated structure because it had to have air/nitrogen injection into the electrolyzer through a blower, electrode cleaning, and cooling and stirring functions through a heat exchanger.

Prior art document 1: Korea Patent Publication No. 10-1289848 (2013.07.24.)

Prior art document 2: Korea Patent Publication No. 10-1998196 (2019.07.09.)

Prior art document 3: Korean Patent Publication No. 10-1610834 (2016.04.08.)

The present invention was invented to solve the above problems, and it has a simple structure that can perform the functions of hydrogen concentration dilution, electrode scale removal, cooling inside the electrolyzer and TRO dispersion without using a blower, heat exchanger, stirrer, etc. It aims to provide a TRO manufacturing apparatus.

In order to achieve the above object, in the present invention, an inlet pipe through which the sample water to be subjected to electrolysis treatment is introduced is connected to the upper side of one side, and an outlet pipe through which the electrolyzed treated water is discharged is connected to the lower side of the other side, and an air vent is provided at the upper side. electrolyzer; an electrode arrangement comprising a plurality of electrodes spaced apart from each other at a predetermined distance in the electrolytic cell, and electrolyzing the number of samples to generate TRO when a current is applied; a rectifier provided on one side of the electrolytic cell and supplying current to the electrode assembly; and an air injector disposed under the electrode assembly and spraying air toward the electrode assembly.

Preferably, the air injector is arranged extending in the horizontal direction on the bottom of the electrolytic cell, having a plurality of injection nozzles spaced apart from each other in the horizontal direction, and injecting air upward toward the electrode assembly, the air The injector is characterized in that it is connected to an air injection pipe having an air injection valve.

Here, the electrodes of the electrode assembly are spaced apart from each other by a predetermined distance and are vertically disposed.

In addition, a porous panel is disposed between the air injector and the electrode assembly to disperse and supply the air injected from the air injector toward the electrode assembly.

Preferably, the air injector injects air of 15° C. or less while a current is supplied from the rectifier to the electrode assembly, and when the rectifier supplies a current of 1A per second, the air injector emits more than 0.2L of air per second It is characterized by supplying

Additionally, the electrolyzer further includes a level sensor therein, wherein the level sensor includes an upper detection switch and a lower detection switch, and the lower detection switch is positioned above the discharge pipe.

Preferably, when the lower detection switch of the level sensor is turned off, the valve of the inlet pipe is opened to supply sample water to the inside of the electrolyzer, and when the upper detection switch of the level sensor is turned on, the inflow It is characterized in that the valve of the tube is closed and the rectifier is activated.

More preferably, it further comprises a TRO sensor for measuring the TRO concentration inside the electrolyzer, and when the measured TRO concentration of the TRO sensor reaches a preset range, the operation of the rectifier is stopped and the valve of the discharge pipe is opened to discharge the treated water to the outside of the electrolyzer.

According to the present invention, hydrogen generated inside the electrolyzer is mixed with the air supplied through the air injector and diluted, so that the hydrogen gas has a concentration below the LEL, so that it can be safely discharged to the outside of the electrolyzer.

In addition, according to the present invention, since the treated water inside the electrolytic cell is dispersed by the flow of air injected through the air injector, it is possible to uniformly distribute the TRO concentration of the treated water without using a separate agitator.

In addition, according to the present invention, a vertical air flow path is formed between the electrodes by the upright arrangement of the electrodes, and this leads to a smooth vertical flow of the air injected from the air injector leading to an increase in the flow rate and thus the scale attached to the electrode surface. can be easily removed.

In addition, according to the present invention, it is possible to prevent a decrease in the TRO concentration of the treated water by supplying air of 15° C. or less to the inside of the electrolytic cell to lower the temperature of the treated water.

1 is a diagram schematically showing the configuration of a high-concentration TRO manufacturing apparatus according to the present invention;
Figure 2 is a schematic plan view of an example of a porous panel applied to the air supply device of Figure 1;

Hereinafter, a preferred embodiment of the high concentration TRO manufacturing apparatus according to the present invention will be described with reference to the accompanying drawings. For reference, in describing the present invention below, terms referring to the components of the present invention are named in consideration of the functions of each component, and thus should not be construed as limiting the technical components of the present invention. will be

1 and 2, the high-concentration TRO manufacturing apparatus according to the present invention is an electrolyzer 110, an electrode assembly 120 for electrolyzing water contained in the electrolyzer 110, and a current to the electrode assembly 120 It is configured to include an air injector 140 for injecting air into the rectifier 130 and the electrolytic cell 110 to supply.

The electrolytic cell 110 has an inlet pipe 111 through which the sample water to be subjected to electrolysis treatment is introduced is connected to the upper side of one side, and the electrolytic treatment water, that is, sterilized water containing TRO (or residual chlorine), is discharged at the lower side of the other side. 112 is connected. In addition, the inlet pipe 111 and the outlet pipe 112 are provided with valves 111a and 112a for controlling the opening/closing operation, respectively. In addition, an air vent 113 for discharging gas generated in the electrolysis process is provided at the upper portion of the electrolytic cell 110 .

The electrode assembly 120 includes a plurality of electrodes 121 and 122 arranged to be spaced apart from each other at a predetermined distance inside the electrolytic cell 110 . The electrodes 121 and 122 are arranged in parallel with the (+) polarity electrode 121 and the (-) polarity electrode 122 as a pair, and a current flows from the rectifier 130 to the electrode assembly 120 . When is applied, TRO is generated by electrolyzing the sample water inside the electrolyzer 110 .

The rectifier 130 is provided on the outside of the electrolytic cell 110 , and supplies a current to the electrode assembly 120 so that the electrolysis process is performed inside the electrolytic cell 110 .

The air injector 140 is disposed under the electrode assembly 120 inside the electrolytic cell 110 , and injects air toward the electrode assembly 120 .

With this configuration, hydrogen generated inside the electrolyzer 110 by the electrolysis process may be mixed with the air supplied through the air injector 140 and diluted. In general, the concentrations of oxygen and hydrogen generated during electrolysis are 66.67% and 33.33%, respectively, which are significantly higher than the LEL. However, according to the present invention, additional air is supplied through the air injector 140 , and accordingly, hydrogen gas is diluted below an appropriate LEL and can be safely discharged to the outside of the electrolytic cell 110 through the air vent 113 .

Preferably, the air injector 140 is connected to the air injection pipe 142 provided with the air injection valve 141, is arranged extending in the horizontal direction on the bottom of the electrolytic cell 110, a plurality of spaced apart from each other Air can be sprayed upward toward the electrode assembly 120 by providing the injection nozzles of the .

Here, the air injector 140 is formed to have a size that covers the horizontal area of the electrolytic cell 110, that is, a size corresponding to the bottom surface of the electrolytic cell 110, and is configured to evenly spray air throughout the electrolytic cell 110. can

With this configuration, since the treated water containing TRO accommodated in the electrolytic cell 110 is dispersed by the flow of air injected through the air injector 140, the electrolytic cell 110 inside the electrolytic cell 110 without using a separate agitator. It is possible to uniformly distribute the TRO concentration of the treated water.

Preferably, the electrodes 121 and 122 of the electrode assembly 120 are spaced apart from each other by a predetermined distance and disposed upright in the vertical direction. The arrangement of the electrodes 121 and 122 allows the air injected from the air injector 140 to move smoothly in the vertical direction inside the electrolytic cell 110 by forming a vertical air flow path between the electrodes.

The vertical air passages of the electrode plates 121 and 122 form a smooth vertical flow of air, so that scale attached to the electrode surface can be easily removed.

Preferably, a porous panel 150 capable of evenly dispersing air is disposed between the air injector 140 and the electrode assembly 120 . The porous panel 150 may be arranged in a plate shape in the space between the air injector 140 and the electrode assembly 120 or may be arranged in a form surrounding the air injector 140 .

By the porous panel 150 , the air injected from the air injector 140 may be evenly distributed while passing through the porous panel 150 to flow between the electrodes 121 and 122 of the electrode assembly 120 . Accordingly, the TRO concentration of the treated water can be uniformly mixed as a whole by evenly dispersing the treated water inside the electrolytic cell 110, and the hydrogen and air generated in the electrolysis process can be smoothly mixed to dilute the hydrogen concentration to below the LEL. can

On the other hand, the temperature of the water inside the electrolytic cell 110 is increased by the flow of current during electrolysis. Depending on the water quality, the TRO concentration in the treated water at a water temperature of 50° C. or less can be reduced by nearly half in one hour.

In order to prevent the TRO concentration reduction of the treated water due to the increase in water temperature, the air injector 140 is configured to inject air of 15° C. or less while a current is supplied to the electrode assembly 120 from the rectifier 130 . Then, the temperature of the treated water is lowered by the air of 15° C. or less supplied into the electrolytic cell 110, and the decrease in the TRO concentration of the treated water at a water temperature of 15° C. or less can be significantly reduced.

Preferably, the air injection amount of the air injector 140 is set as follows. In general, the amount of hydrogen generated during electrolysis is one hydrogen molecule when two electrons are supplied by the following formula.

2H ₂ O + 2e ^- → H ₂ ( g ) + 2OH ^- ( aq )

Here, 2F electrons are required to generate 1 mol of hydrogen, and the amount of 1 mol of hydrogen is 22.4 L (STP conditions, that is, 0° C. 1 atm (atm)). And, the amount of charge of 1F is as follows, and in order to generate 22.4L of hydrogen per second, a current of 193,000A must flow per second.

1F = (1.6Х10 ^-19 C) Х (6.02Х10 ²³ ) = 96500C

Converting this, 0.00011606L of hydrogen is generated per 1A, and more than 0.193L of air must be supplied to dilute it to LEL 50% or less.

According to this calculation, the high-concentration TRO manufacturing apparatus according to the present invention, when the rectifier 130 supplies a current of 1A per second to the electrode assembly 120, the air injector 140 transmits 0.2L or more of air per second to the electrolyzer 110 ) is preferably configured to feed inside.

Additionally, the electrolyzer 110 may further include a level sensor 160 therein. The level sensor 160 includes an upper detection switch 161 and a lower detection switch 162 . Here, the upper detection switch 161 is installed above the electrode assembly 120 to detect the full water level of the electrolytic cell 110 , and the lower detection switch 162 is below the electrode assembly 120 and the discharge pipe 112 . Rather, it is installed above to detect the low water level of the electrolyzer 110 .

Specifically, when the lower detection switch 162 of the level sensor 160 does not come into contact with the water inside the electrolyzer 110 and is in an off state, the valve 111a of the electrolyzer inlet pipe 111 is opened to generate electricity The sample water to be decomposed is supplied into the electrolyzer 110 . On the other hand, when the upper detection switch 161 of the level sensor 160 comes into contact with the water inside the electrolyzer 110 and turns on, the valve 111a of the electrolyzer inlet pipe 111 is closed and the rectifier 130 ) is activated and electrolysis treatment is performed. And, after the electrolysis treatment is performed for a predetermined time, the valve 112a of the electrolytic cell discharge pipe 112 is opened, so that treated water having a predetermined TRO concentration can be supplied to a required place.

Preferably, the high-concentration TRO manufacturing apparatus according to the present invention may further include a TRO sensor (not shown) for measuring the TRO concentration of the treated water inside the electrolyzer 110 . Then, the rectifier 130 supplies a current to the electrode assembly 120 until the measured value of the TRO concentration of the TRO sensor reaches a preset range so that electrolysis is performed, so that the treated water having a high TRO concentration can be manufactured. Subsequently, when the TRO concentration measurement value of the TRO sensor reaches a preset range, the operation of the rectifier 130 is stopped, the valve 112a of the electrolytic cell discharge pipe 112 is opened, and the high concentration TRO treated water is outside the electrolyzer 110 . can be emitted as

The embodiments of the present invention described above are merely illustrative of the technical idea of the present invention, and the protection scope of the present invention should be interpreted by the following claims. In addition, various modifications and variations will be possible without departing from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. It should be interpreted as being included in the scope of rights.

110: electrolytic cell 111: inlet pipe
111a: inlet pipe valve 112: outlet pipe
112a: outlet line valve 113: air vent
120: electrode arrangement 121: + electrode
122: - electrode 130: rectifier
140: air injector 141: air injection valve
142: air injection tube 150: porous panel
160: level sensor 161: upper detection switch
162: lower detection switch

Claims (8)

an inlet pipe through which the sample water to be subjected to electrolysis treatment is introduced is connected to the upper side of one side, and an outlet pipe through which the electrolyzed treated water is discharged is connected to the lower side of the other side, and an air vent is provided at the top;
an electrode arrangement comprising a plurality of electrodes spaced apart from each other at a predetermined distance in the electrolytic cell, and electrolyzing the number of samples to generate TRO when a current is applied;
a rectifier provided on one side of the electrolytic cell and supplying current to the electrode assembly; and
A high concentration TRO manufacturing apparatus including an air injector disposed under the electrode assembly and spraying air toward the electrode assembly.
The method of claim 1,
The air injector is arranged extending in the horizontal direction on the bottom of the electrolytic cell, having a plurality of injection nozzles spaced apart from each other in the horizontal direction, and spraying air upward toward the electrode assembly,
The air injector is a high concentration TRO manufacturing apparatus, characterized in that connected to the air injection pipe having an air injection valve.
3. The method of claim 2,
The high concentration TRO manufacturing apparatus, characterized in that the electrodes of the electrode assembly are spaced apart from each other by a predetermined distance and are arranged upright in the vertical direction.
3. The method of claim 2,
A porous panel is disposed between the air injector and the electrode assembly, and the high concentration TRO manufacturing apparatus, characterized in that the air injected from the air injector is dispersed and supplied to the electrode assembly side.
According to claim 1,
The air injector injects air of 15° C. or less while a current is supplied to the electrode assembly from the rectifier,
High concentration TRO manufacturing apparatus, characterized in that when the rectifier supplies a current of 1A per second, the air injector supplies 0.2L or more of air per second.
According to claim 1,
The electrolyzer further includes a level sensor therein, the level sensor includes an upper detection switch and a lower detection switch, wherein the lower detection switch is located above the discharge pipe.
7. The method of claim 6,
When the lower detection switch of the level sensor is off, the valve of the inlet pipe is opened to supply sample water to the inside of the electrolyzer, and when the upper detection switch of the level sensor is turned on, the valve of the inlet pipe is opened High concentration TRO manufacturing apparatus, characterized in that closing and operating the rectifier.
8. The method of claim 7,
Further comprising a TRO sensor for measuring the TRO concentration inside the electrolyzer,
When the TRO concentration measurement value of the TRO sensor reaches a preset range, the rectifier is stopped and the valve of the discharge pipe is opened to discharge the treated water to the outside of the electrolyzer.

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