JPH07216574A - Sodium hypochlorite forming device - Google Patents

Abstract

PURPOSE:To provide a sodium hypochlorite forming device capable of efficiently separating gaseous hydrogen from a sodium hypochlorite soln., capable of preventing the infiltration of hydrogen into the soln., with the pressure fluctuation reduced, capable of obviating the damage to the gas vent valve of a gas-liq. separator and generation of an abnormal sound and further capable of preventing the injection of the sodium hyprochlorite soln. from this vent valve. CONSTITUTION:This sodium hypochlorite forming device is provided with an internal pressure-type closed electrolytic cell 8 for electrolyzing a dil. brine to form a sodium hypochlorite soln. and a gas-liq. separator 13 for separating the gaseous hydrogen generated in the cell 8 from the soln., the separator 13 has a gas vent valve 98 on the upper side and a float 93 on the lower side to open or close the valve 98 in accordance with the level of the soln., and the upper sides and lower sides of the cell 8 and main body 89 of the separator are respectively connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sodium hypochlorite generator for use in disinfecting waterworks.

[0002]

2. Description of the Related Art As a sodium hypochlorite generator used for disinfecting waterworks, water supply facility design guidelines and explanations (19
90) (published by the Japan Water Works Association), page 253, the saline solution from the salt dissolving tank is diluted with the diluting water from the diluting water tank, and the diluted saline solution is electrolyzed in an electrolytic cell to After producing sodium chlorate liquid and gas-liquid separating the hydrogen gas from the sodium hypochlorite liquid in the gas-liquid separator, store the sodium hypochlorite liquid in the sodium hypochlorite liquid storage tank, and store the hydrogen gas. Is diluted with air from a gas dilution fan and released into the atmosphere.

Further, in the gas-liquid separation type, a small space is formed in the upper part of the electrolytic cell to provide a gas-liquid separator, and hydrogen gas accumulates in the upper part of the electrolytic cell, and if the pressure rises above a certain level, A type that releases the hydrogen gas by opening the gas release valve of the gas-liquid separator against the spring pressure, and sends the sodium hypochlorite solution containing hydrogen gas bubbles to the gas-liquid separator for gas-liquid separation. A type in which sodium hypochlorite liquid and hydrogen gas are separated into gas and liquid in the container, and hydrogen gas is released from the gas vent valve on the upper part, gas by a float that moves up and down according to the liquid level in the container There is a type in which hydrogen gas is released from the gas vent valve by opening and closing the vent valve.

[0004]

In the conventional gas-liquid separation type, since the effective separation area for gas-liquid separation in the gas-liquid separator is small, the separation efficiency of sodium hypochlorite liquid and hydrogen gas is very high. However, there is a drawback that a large amount of hydrogen gas in the form of bubbles is sent to the sodium hypochlorite solution storage tank while being mixed in the sodium hypochlorite solution.

Further, in the conventional gas-liquid separator, the gas chamber and the open area of the gas-liquid separator itself are very small. Therefore, if there is a variation in the amount of hydrogen gas generated, the variation immediately appears as a pressure fluctuation. , The pressure of hydrogen gas fluctuates constantly. For this reason, when the hydrogen gas pressure rises above a certain level, in a gas-liquid separator with a structure that releases the hydrogen gas by opening the gas release valve against the spring pressure, the valve body of the gas release valve is constantly opened and closed. There is a problem in that the gas vent valve is significantly damaged due to wear, and an abnormal noise is generated from the gas vent valve when the hydrogen gas escapes.

Further, in the float type gas-liquid separator, troubles of the float may be caused, which may lead to malfunction. Furthermore, in the conventional gas-liquid separator, when the pressure of hydrogen gas rises above a certain level, the liquid level inside the vessel decreases due to the internal pressure, the float moves largely downward, the degassing valve opens, or the spring pressure is increased. The structure is such that the degassing valve opens against the above conditions, and the separation efficiency of sodium hypochlorite liquid and hydrogen gas is poor, so if the internal pressure in the electrolytic cell rises sharply, There is also a problem that a large amount of sodium hypochlorite solution is ejected together with the gas.

In view of the above conventional problems, the present invention has a good separation efficiency of sodium hypochlorite liquid and hydrogen gas, can prevent the mixing of hydrogen gas into the sodium hypochlorite liquid, and can reduce the pressure of hydrogen gas. A sodium hypochlorite generator that has little fluctuation, can prevent damage to the gas vent valve of the gas-liquid separator, can prevent abnormal noise, and can prevent the ejection of sodium hypochlorite solution from the gas vent valve. It is provided.

[0008]

The present invention according to claim 1 provides an electrolytic cell 8 for electrolyzing a dilute saline solution to produce a sodium hypochlorite solution, and a hydrogen gas generated in the electrolytic cell 8. In the sodium hypochlorite generator comprising a gas-liquid separator 13 for gas-liquid separation with a sodium hypochlorite liquid, the electrolytic cell 8 is of a sealed internal pressure type, and the gas-liquid separator 13 is a gas on the upper side thereof. Drain valve 98
And a float 93 that opens and closes the gas vent valve 98 according to the liquid level of the sodium hypochlorite solution on the lower side, and connects the electrolytic cell 8 and the upper and lower sides of the separator body 89, respectively. Is.

According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of electrolytic cells 8 are provided, and each electrolytic cell 8 is provided with an upper gas layer pipe 41 and a lower liquid layer pipe 40. They are connected in series by and.

According to a third aspect of the present invention, in the invention according to the first or second aspect, among the plurality of electrolytic cells 8 connected in series, the final electrolytic cell 8 is the gas-liquid separator. It is connected to 13.

The present invention according to claim 4 provides the invention according to claims 1 and 2.
Alternatively, in the invention described in 3, the electrolytic cell 8 is provided in the main body of the tank,
Plural ascending passages 45 and descending passages in the dilute saline flow direction
46 and are alternately formed, and the passages 45, 4 are formed on the upper side in the tank main body 42.
It is designed to create a vapor layer A of hydrogen gas that extends over 6.

The present invention according to claim 5 relates to claim 1,
In the invention described in 2, 3, or 4, the width of the ascending passage 45 is made large and the width of the descending passage 46 is made small, and
The electrode unit 44 and the cooling parts 49, 50 of the cooling means 51 are arranged in the 45, and the cooling parts 49, 50 are attached to the lid 43 detachably attached to the tank body 42.

[0013]

According to the first aspect of the present invention, the dilute saline is electrolyzed in the electrolytic cell 8 to produce the sodium hypochlorite solution. Since the electrolyzer 8 is a closed internal pressure type, the hydrogen gas generated during electrolysis of diluted saline solution is in the gas phase A above the sodium hypochlorite solution.
Therefore, gas and liquid can be separated into sodium hypochlorite liquid and hydrogen gas in the electrolytic cell 8. And electrolyzer 8
The hydrogen gas and the sodium hypochlorite solution which have been gas-liquid separated by the above are separately sent to the gas-liquid separator 13, and the gas vent valve 98 of the gas-liquid separator 13 is sent.
Remove hydrogen gas from.

Therefore, the sodium hypochlorite solution and the hydrogen gas can be separated into gas and liquid in the electrolytic cell 8, and the hydrogen gas and the sodium hypochlorite solution which have already been separated in the electrolytic cell 8 side can be separated from each other. Since it is sent to the gas-liquid separator 13 and hydrogen gas is extracted from the gas release valve 98 at the top of the gas-liquid separator 13, the separation efficiency between sodium hypochlorite liquid and hydrogen gas is good, Of hydrogen gas can be prevented.

Particularly, the gas vent valve 98 of the gas-liquid separator 13 has a float 93 depending on the liquid level of the sodium hypochlorite liquid below it.
Since it is a structure that opens and closes due to the fact that it remains stable in a throttled state unless the liquid level of the sodium hypochlorite solution fluctuates, hydrogen gas can be stably discharged from the gas vent valve 98, and there is little fluctuation in hydrogen gas pressure. At the same time, the gas vent valve 98 of the gas-liquid separator 13 can be prevented from being damaged and noise can be prevented from being generated, and the sodium hypochlorite solution can be prevented from being ejected from the gas vent valve 98.

In the present invention as set forth in claim 2, since a plurality of electrolyzers 8 are connected in series by an upper gas layer pipe 41 and a lower liquid layer pipe 40, hydrogen is supplied to each electrolytic bath 8. Each gas can be separated into gas and liquid, the effective separation area becomes very large, the separation efficiency of gas-liquid separation is significantly improved, and the hydrogen gas and the sodium hypochlorite liquid separated in each electrolytic cell 8 are separated. Air layer A
And the liquid layer B can be separately sent to the gas-liquid separator 13.

Further, since the gas layer A of each electrolytic cell 8 is unified via the gas layer piping 41, even if there is some variation in the amount of hydrogen gas generated in each electrolytic cell 8, each electrolytic cell 8 The variation can be absorbed as a whole, and the pressure fluctuation of hydrogen gas is reduced.
Moreover, the open area of the liquid surface of each electrolysis cell 8 is wide, and hydrogen gas is gently released from the sodium hypochlorite solution in the form of minute bubbles, so pressure fluctuations in each electrolysis cell 8 are unlikely to occur.

According to the present invention as set forth in claim 3, among the plurality of electrolytic cells 8 connected in series, the electrolytic cell 8 at the final stage is connected to the gas-liquid separator 13. Only one gas-liquid separator 13 is required for the electrolytic cell 8, which simplifies the structure.

According to the present invention as set forth in claim 4, a plurality of ascending passages 45 and descending passages 46 are alternately formed in the tank main body 42 of the electrolytic cell 8 in the flow direction of the dilute saline solution, while the tank main body is formed. A gas layer A of hydrogen gas straddling each of the passages 45 and 46 is formed on the upper side in 42, and diluted saline solution repeatedly rises and falls in the tank body 42 and flows while separating gas and liquid. Therefore, the efficiency of gas-liquid separation of hydrogen gas is further improved.

In the present invention according to claim 5, the ascending passage 45
Of the cooling unit 49, 5 of the cooling means 51 and the electrode unit 44 in the ascending passage 45.
0 and the lid 43 detachably attached to the tank body 42.
The cooling units 49 and 50 are attached to the inside of the tank main body 42, so that the electrode unit 44 and the cooling units 49 and 50 can be efficiently arranged in the tank main body 42. Further, since the electrode unit 44 is provided in the ascending passage 45, the flow of the diluted saline solution can be promoted by the temperature rise due to electrolysis and the generation of hydrogen gas.

Moreover, since the ascending passage 45 has a large width and the electrode unit 44 and the cooling parts 49, 50 are provided in the ascending passage 45,
The convection of the diluted saline solution is generated in the ascending passage 45.Therefore, the diluted saline solution that flows past the electrode unit 44 to the next stage is circulated in the ascending passage 45 due to shunting, drifting, convection, etc. While being electrolyzed and mixed with the diluted saline that flows to the next stage, the electrolysis surface of the electrode unit 44 can be effectively used, and the electrolysis efficiency of the electrode unit 44 is improved.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 4 show the external appearance of the sodium hypochlorite generator, FIG. 5 shows the internal structure of the lower side of the sodium hypochlorite generator, and FIG. 6 shows the connection of the entire sodium hypochlorite generator. Show the relationship.

In FIG. 1 to FIG. 4, reference numeral 1 denotes a box-shaped device main body, and the inside of the device main body 1 is divided into upper and lower two stages, and a pair of upper and lower opening and closing doors 2 and 3 are provided on the front side thereof. There is. Various control devices such as a rectifier and a control panel are installed in the upper stage of the device body 1, and various instruments 4 are installed in the upper opening / closing door 2.

As shown in FIG. 5, an upper frame 5 and a lower frame 6 are provided on the lower side of the apparatus main body 1 in the upper and lower sides.
Two main electrolyzers 8 are placed on each of the left and right via a pair of left and right guide rails 7. Each guide rail 7 is L
The angle-shaped member is formed on the frames 5 and 6 in the front-rear direction, and each main electrolytic cell 8 is mounted on the pair of guide rails 7 so as to be freely inserted and removed from the front.

Each main electrolysis tank 8 is fixed on the front side thereof by a stopper attached to each guide rail 7 so as not to move in the front-rear direction. A drain pan 9 is attached to the lower end of the apparatus main body 1 over the entire bottom surface thereof, and a drain pit 10 is formed in the drain pan 9.

A diluted saline supply pipe 11 and a pre-electrolysis tank 12 are arranged near one side outside the apparatus main body 1, and a gas-liquid separator 13, a gas discharge cylinder 14 and a gas dilution fan are arranged on the other side. 15 and are arranged. The dilute saline supply pipe 11 is for supplying dilute saline to the main electrolytic cell 8, and the concentrated saline supply pipe 16 is provided on the upstream side.
And a dilution water supply pipe 17 are connected to each other, and a flow rate instruction adjusting alarm meter 18 is provided in the middle of the dilution water supply pipe 17.

As shown in FIG. 6, the concentrated salt water supply pipe 16 is connected to a concentrated salt water source 19 for pumping concentrated salt water to the diluted saline solution supply pipe 11, and the diluted water supply pipe 17 is connected to a diluted water source 20. . The concentrated salt water source 19 includes a concentrated salt water tank for storing concentrated salt water and a concentrated salt water pump for pumping the concentrated salt water in the concentrated salt water tank. The diluting water source 20 is composed of a diluting water tank for storing the diluting water, and a diluting water pump or a solenoid valve for pumping or supplying the diluting water in the diluting water tank.

The diluted salt water supply pipe 11 includes a concentrated salt water supply pipe 16
A Y-type strainer 21 and a pre-electrolysis tank 12 having open / close valves 22 and 23 at the front and back are provided in series at the downstream side of the confluence portion between the pre-electrolysis tank 12 and the dilution water supply pipe 17. A bypass passage 25 having an on-off valve 24 is connected so as to be in parallel with the on-off valves 22 and 23 before and after it. A hydrochloric acid supply pipe 27 having an opening / closing valve 26 is provided between the opening / closing valve 22 and the pre-electrolysis tank 12.
Are connected. The on-off valves 22, 23, 24 can be manually operated outside the apparatus main body 1, and by opening / closing each of the on-off valves 22, 23, 24, the pre-electrolysis cell 12 and the bypass passage 25 are selectively switched. You can do it.

The gas-liquid separator 13 is for separating the sodium hypochlorite solution generated by electrolysis in the main electrolysis tank 8 and the hydrogen gas generated during the electrolysis, and is located outside the apparatus main body 1. It is vertically arranged in the vicinity and is attached to the apparatus main body 1 via a bracket 28.

A gas pipe 29 and a liquid pipe 30 are connected to the upper and lower sides of the gas-liquid separator 13, a gas discharge pipe 31 is provided at the upper end, and a liquid take-out pipe 33 having an opening / closing valve 32 is provided at the lower end. Each is connected. The liquid take-out pipe 33 is for pressure-feeding the sodium hypochlorite liquid from the gas-liquid separator 13 to the liquid storage tank 99 arranged at a high place, etc., and an opening / closing valve 34 is provided at the bottom of the liquid take-out pipe 33. The hydrochloric acid discharge pipe 35 included therein is connected.

The gas discharge cylinder 14 is for diluting the hydrogen gas sent from the gas-liquid separator 13 with air and discharging it into the atmosphere from the opening at the upper end. The gas discharge pipe 31 is connected to the upper side surface of the gas discharge cylinder 14. Gas dilution fan 15
Is for sending dilution air to the gas discharge cylinder 14, and is integrally provided with a fan case 36 to which the gas discharge cylinder 14 is fixed and a drive motor 37 for driving a fan blade inside the fan case 36. It is fixed to the side surface of the apparatus main body 1 via a stand 38.

At the bottom of the fan case 36, the gas exhaust pipe 31
A drain pipe 39 is connected so that when the sodium hypochlorite solution is ejected from the gas discharge cylinder 14 into the drain pan 9, the drain pipe 39 is connected. Drain pan through the opening formed at the bottom of the side wall of
9 Guided above.

Each of the main electrolysis cells 8 is for electrolyzing dilute saline to produce sodium hypochlorite solution. The respective main electrolysis tanks 8 are connected in series by the liquid layer pipe 40 on the lower side and the gas layer pipe 41 on the upper side so that the upper side is the upstream side and the lower side is the downstream side.

A diluted saline supply pipe 11 is connected to the lower side of the main electrolysis tank 8 on the upstream side (right side in FIG. 5) of the two left and right main electrolysis tanks 8 of the upper stage, A gas pipe 29 and a liquid pipe 30 connected to the gas-liquid separator 13 are vertically connected to the downstream main electrolysis tank 8 of the two left and right main electrolysis tanks 8 (on the left side in FIG. 5). .

On the other hand, the main electrolysis tank 8 on the downstream side (left side in FIG. 5) of the two main electrolysis tanks 8 on the left and right of the upper stage and the upstream side of the two main electrolysis cells 8 on the left and right of the lower stage (FIG. Main electrolyzer 8 (right of 5)
A liquid layer pipe 40 and a gas layer pipe 41 that connect to each other are arranged diagonally behind the main electrolytic cell 8. Each main electrolyzer
Reference numeral 8 denotes a closed internal pressure type and an up-down flow type self-gas-liquid separation type, which is configured as shown in FIGS. 7 to 9.

That is, as shown in FIGS. 7 to 9, each main electrolytic cell 8 has a box-shaped cell body 42 having an open upper side, and a lid body detachably attached to the opening side of the cell body 42. 43 and the tank body
Inside the 42, a plurality of ascending passages 45 and descending passages alternately formed by a plurality of lower partition plates 47 and upper partition plates 48.
46, a plurality of electrode units 44 arranged in each ascending passage 45, and a cooling means 51 having a pair of front and rear cooling parts 49, 50 arranged on both sides of the electrode unit 44 in each ascending passage 45. I have it.

Both the tank main body 42 and the lid 43 are made of synthetic resin, but a transparent material is used for the lid 43 so that the inside of the tank main body 42 can be seen through. A flange portion 52 is provided on the outer periphery of the upper end of the tank body 42, and a lid body 43 is detachably fixed to the flange portion 52 by a fixture such as a bolt. The tank body 42 has pipe joints 53, 54 on the lower side of the front and rear side walls, and a liquid layer for connecting the diluted saline supply pipe 11 and each main electrolysis bath 8 to each other via the pipe joints 53, 54. The pipe 40 is connected.
The lid 43 has pipe joints 55 and 56 at both front and rear ends.
Air layer piping that connects each main electrolyzer 8 to each other via 55,56
41 is connected.

Each of the electrode units 44 is a combination of two or three electrodes 57 on the anode side and electrodes 58 on the cathode side alternately from the left and right sides, and each of the electrodes 57, 58 is connected to the anode side and the cathode side. The conductive plates 60 and 61 arranged on both the left and right sides are separately fixed so that the number of the sheets becomes 2 and 3 alternately. The conductive plates 60 and 61 are provided so as to be insertable and removable from above along the inner surfaces of the left and right side walls of the tank body 42, and the terminals on the anode side and the cathode side mounted on the front and rear ends of the side wall of the tank body 42. Metal fittings 62,63
Electrically connected to.

The width of the ascending passage 45 is large in the front-rear direction, and the width of the descending passage 46 is small. The lower partition plate 47 and the upper partition plate 48 are alternately arranged at a predetermined interval in the tank body 42 so as to alternately form the ascending passages 45 and the descending passages 46 having different widths.

The lower partition plate 47 has its lower end and left and right ends fixed to the tank body 42. The left and right ends of each upper partition plate 48 are fixed to the tank body 42 so that a gap is formed between the upper and lower lids 43 and the bottom wall of the tank body 42. The upper side of the tank main body 42 communicates with all the passages 45 and 46 through the gap between the lid 43 and the upper partition plate 48.
When electrolyzing the dilute saline solution, a hydrogen gas vapor layer
A can be done.

The left and right ends of each partition plate 47, 48 are
Slit-shaped notches are provided so that the conductive plates 60, 61 of the electrode unit 44 can be freely inserted and removed along the left and right side walls of the tank body 42.

Below each ascending passage 45, each electrode unit is provided.
A lower chamber 65 partitioned by a partition plate 64 on the lower side of 44 is provided. Each partition plate 64 is at a position corresponding to the lower end portion of the upper partition plate 48, between the front and rear side walls of the tank body 42 and the partition plates 47, 48 corresponding thereto, and before and after sandwiching the electrode unit 44.
They are fixed between the partition plates 47 and 48, respectively. In each partition plate 64, a plurality of openings 66 are formed at predetermined intervals in the left-right direction so as to correspond to the lower side of the electrode unit 44,
The diluted saline solution that has entered the ascending passage 45 through the opening 66 is configured to flow as an ascending flow while being electrolyzed between the electrodes 57 and 58 of the electrode unit 44.

The cooling means 51 comprises a pair of cooling parts 49, 50 which are formed by bending a titanium tube or the like into a U-shape and are arranged on both front and rear sides of each electrode unit 44. Each cooling unit
49, 50 have one ends thereof connected to each other by a connecting part 67 that passes laterally from above the electrode unit 44, and have rising parts 49a, 50a bent upward at the other ends. The rising portions 49a and 50a are fixed to the lid body 43 so as to penetrate the lid body 43 and project upward, and are connected to each other by the pipe joints 68 and 69 on the upper side of the lid body 43, and Cooling unit 4
Cooling water flows from 9,50 in series to the cooling sections 49,50 on the other end.

The cooling parts 49 and 50 may be formed by winding a titanium tube or the like in a coil, or by providing fins on the outer circumference of the titanium tube or the like. The cooling means 51 can be attached and detached integrally with the lid body 43 when the lid body 43 is attached to and detached from the tank body 42,
When the lid body 43 is attached to the tank main body 42, a pair of cooling parts 49 and 50 are located in front of and behind the electrode units 44 in the ascending passages 45.

As shown in FIG. 6, the cooling means 51 of each main electrolytic cell 8 has one end connected to the cooling water supply pipe 71 via the on-off valve 70 and the other end connected to the cooling water discharge pipe 72. Has been done. The cooling water supply pipe 71 is connected to a cooling water source 75 via a solenoid valve 73, an opening / closing valve 74, etc., and the cooling water discharge pipe 72 is connected to a cooling water tank 76.

The solenoid valve 73 receives signals from the operation panel,
It is controlled by a signal from a temperature indicator / alarm 77 provided in the liquid pipe 30 between the main electrolyzer 8 at the final stage and the gas-liquid separator 13, and the secondary side at the outlet side of the main electrolyzer 8 at the final stage is controlled. In order to keep the temperature of the sodium chlorate solution within the range of 10 to 25 ° C., the opening / closing operation is performed so as to send the cooling water to the cooling means 51 of each main electrolytic cell 8.

As shown in FIGS. 11 and 12, the pre-electrolysis cell 12 has a transparent cylindrical tank body 78 made of synthetic resin, and flanges 79 and 80 at the upper and lower ends of the tank body 78. An upper lid 81 and a lower lid 82 which are detachably attached, and a pair of electrodes 83 provided in the tank body 78 are provided, and are detachably attached between a pair of upper and lower mounting flanges 84, 85 of the diluted saline supply pipe 11. It is installed. The tank main body 78 is made of a transparent synthetic resin material so that the condition of the electrodes 83 inside the tank main body 78 can be confirmed from the outside, and the entire tank main body 78 serves as a see-through portion. Tank body 78
Mounting plates 86, 87 are interposed between the flanges 79, 80 at the upper and lower ends of the unit and the upper cover 81 and the lower cover 82, and the front electrolysis tank 12 of the apparatus main body 1 is inserted through the mounting plates 86, 87. It is fixed to the side wall.

Although the tank main body 78 is made of a transparent synthetic resin material in this embodiment, a transparent see-through portion may be provided in a part thereof. As shown in FIG. 13, the gas-liquid separator 13 has a cylindrical separator body 89 having a lower lid 88, a detachable mount on the upper end of the separator body 89 via a flange 90, and a central portion. An upper lid 92 having a nozzle hole 91 for degassing, a hollow float 93 vertically movable in a separator body 89, a support rod 94 fixed to the center of the upper end of the float 93, and a support rod. A valve rod 95 pivotally attached to the upper end of the valve 94 is provided, and a valve body 96 for opening and closing the nozzle hole 91 fixed to the upper end of the valve rod 95. The nozzle hole 91 and the valve body 96 constitute a gas vent valve 98.

A liquid pipe 30 and a liquid take-out pipe 33 are connected to the lower part of the separator main body 89, and a gas pipe 29 is connected to the upper part of the separator main body 89. Sodium hypochlorite liquid is placed in the lower part of the separator main body 89. Supply,
It is designed to supply hydrogen gas to the upper part. float
93 is a guide portion 97 that slides in the vertical direction along the inner wall of the separator body 89 so as to move up and down according to the change in the liquid level of the sodium hypochlorite solution in the separator body 89. To have. A plurality of guide portions 97 are provided in the circumferential direction on the outer periphery of the separator body 89 at intervals. The gas discharge pipe 31 is connected to the upper lid 92 so as to communicate with the nozzle hole 91.

The electrodes 57, 58 of each main electrolyzer 8 and the electrode 83 of the pre-electrolyzer 12 are electrically connected in series, and if the pre-electrolyzer 12 is not used, Electrode of electrolytic cell 12
83 is short-circuited. Next, the action of the sodium hypochlorite generator at the time of generating the sodium hypochlorite liquid will be described.

At the start of operation, as shown in the flow chart of FIG. 15, when an operation command (step S1) is issued from the central operation panel, the operation panel in the main body 1 of the apparatus is turned on (step S1).
2), start operation of the salt water pump and the gas dilution fan 15 (steps S3, S4). At the same time, the temperature indicator / alarm 77 measures the temperature of the sodium hypochlorite liquid in the liquid pipe 30 to determine whether the temperature is high or low (step S5). When the temperature is high, the solenoid valve of the cooling water supply system Open (step S
6) When the temperature is low, leave the solenoid valve closed (step S7).

When a predetermined time (0 to 120 seconds) elapses at the same time as the operation of the salt water pump is started (step S8), the dilution water pump is operated or the solenoid valve is opened (step S9), and the diluted salt solution is added. Diluted saline starts to flow into the supply pipe 11. Then, at the same time, when the timer operates and a predetermined time (about 0 to 60 seconds) elapses (step S10), the flow rate instruction adjusting alarm meter 18 of the dilution water supply pipe 17 measures the flow rate of the dilution water, and the flow rate is normal. It is determined whether or not (step S11).

If the flow rate of the diluting water at this time is normal, the rectifier is operated (step S12) and electricity is supplied to all of the pre-electrolysis cell 12 and each main electrolysis cell 8 (step S13). Further, when the flow rate of the diluting water is small due to the inclusion of air or the like, the same measurement and determination are repeated until a normal flow rate is reached while leaving an appropriate time by the delay timer (step S14).

When stopping the operation, as shown in the flow chart of FIG. 16, the operation stop command (step
S15) or a signal from the interlock system in the device (step S16), the operation panel in the device body 1 is turned off (step S17), and the rectifier is stopped first (step S17).
S18). As the interlock signal, an excessive DC current, an excessive DC voltage, a decrease in the flow rate of dilute saline, stop and start at the upper or lower limit of the liquid level of the sodium hypochlorite liquid storage tank 99, and Excessive temperature of sodium chlorite solution, trip of gas dilution fan 15, trip of salt water pump, etc.

Simultaneously with the stop of the rectifier, the dilution water pump is stopped or the electromagnetic valve is closed (step S19), whereby the dilution water in the dilution water supply pipe 17 is stopped. When a predetermined time (about 0 to 120 seconds) elapses after the timer is activated (step S2
0), the salt water pump and the gas dilution fan 15 are stopped (steps S21 and S22).

When the salt water pump is operated, concentrated salt water is supplied from the concentrated salt water source 19 to the diluted salt water supply pipe 11 through the concentrated salt water supply pipe 16, and when the diluted water pump is operated or the solenoid valve is opened, the diluted water source is supplied. Since diluted water is supplied from 20 to the diluted saline supply pipe 11 via the diluted water supply pipe 17, the diluted saline supply pipe 11
The concentrated salt water is diluted with the diluted water to form a diluted saline solution having a concentration of about 3%. Then, while the diluted saline solution is pumped at a predetermined pressure by the salt water pump and the dilution water pump,
It is sequentially supplied from the dilute saline supply pipe 11 to each main electrolysis tank 8 through either the pre-electrolysis tank 12 or the bypass passage 25.

When the diluted saline solution is passed through the pre-electrolysis tank 12, the opening / closing valve 24 of the bypass passage 25 is closed, and the opening / closing valves 22 and 23 before and after the pre-electrolysis tank 12 are opened. Then, the diluted saline enters the tank main body 78 of the pre-electrolysis tank 12 from the bottom side through the opening / closing valve 22, rises in the tank main body 78, and escapes from the upper side. Then, while passing upward in the tank body 78, the diluted saline solution is electrolyzed by the current flowing between the electrodes 83.

The electrolysis in this pre-electrolysis cell 12 is pre-compared with each main electrolysis cell 8 in the subsequent stage, but sodium hypochlorite is generated during the electrolysis, and its concentration rises. . When tap water or the like is used as the diluting water, the mineral component contained in the dilute saline is electrolyzed, and the mineral component is deposited and adheres to the cathode side of the electrode 83 as a scale. Therefore, the mineral components can be removed from the diluted saline solution supplied to the main electrolytic cell 8 in the subsequent stage by the amount that is deposited in the front electrolytic cell 12 and adheres as a scale to the cathode side.
Each main electrolysis tank 8 can be supplied with diluted saline containing a small amount of mineral components.

Therefore, by providing the front electrolyzer 12 in front of the main electrolyzer 8, it is possible to suppress the generation of scale in the main electrolyzer 8 and to prevent the metal short circuit between the electrodes 57 and 58 due to the scale. There is an advantage that the main electrolytic cell 8 can be protected.

The scale attached to the cathode side of the electrode 83 of the pre-electrolysis cell 12 grows with the lapse of time when it is used for a long period of time. On the other hand, the front electrolyzer 12
Although the mineral components of diluted saline can be removed with, the removal is not always complete.
Scale also adheres to the cathode side of 7,58. However, since the scale adhesion amount on the main electrolysis tank 8 side has a correlation with the scale adhesion amount on the pre-electrolysis tank 12 side, it is easy and It is possible to reliably predict and judge, and it is possible to judge whether or not the inspection of the main electrolytic cell 8 side is necessary.

That is, in the pre-electrolysis cell 12, the cell body 78 is made of a transparent material, and the condition of the internal electrode 83 can be visually confirmed from the outside. By looking at it, the amount of adhered scale on the electrode 83 can be known, and from this, the amount of adhered scale on the main electrolytic cell 8 side can be determined. Therefore, the front electrolysis tank 12 can be used as a monitor for determining the amount of scale adhered in the main electrolysis tank 8.

Further, when the dilute saline solution is electrolyzed in the pre-electrolysis cell 12, the dilute saline solution is heated by the electric resistance of the dilute saline solution, so that the dilute saline solution is supplied from the pre-electrolysis cell 12 to the main electrolysis cell 8. The temperature of the diluted saline solution can be raised to the proper temperature. Incidentally, when the temperature on the inlet side of the pre-electrolysis cell 12 is 2 to 3 ° C, the temperature on the outlet side can be raised to about 5 to 6 ° C.

Therefore, even when it is used in a cold region in winter, the temperature of the diluted saline solution supplied to the main electrolytic cell 8 in the subsequent stage is too low, and the electrodes 57, 58 of the main electrolytic cell 8 are consumed in a short period of time. Therefore, the durability of the electrodes 57, 58 of the main electrolytic cell 8 can be significantly improved. On the other hand, the electrode 83 of the pre-electrolysis cell 12 can also be incorporated with one having low temperature durability, and the pre-electrolysis cell 12 can be used as the main electrolysis cell 8 if necessary.
It is also possible to place 2 or 3 stages in front of.

To remove the scale attached to the electrode 83 of the pre-electrolysis tank 12, the polarity of the electrode 83 may be switched to the opposite direction and the current may be passed in the opposite direction. The front electrolyzer 12 is the device body 1
Of the device main body by removing the mounting flanges 84 and 85 and the mounting plates 86 and 87 above and below
1 and the diluted saline supply pipe 11 can be easily removed, so even if the pair of electrodes 83 becomes metal short-circuited due to adhesion of scale and it becomes unusable, it will be compared to each main electrolysis tank 8 in the device body 1. Therefore, the repair and replacement can be performed very easily.

When the pre-electrolysis tank 12 is not used, the opening / closing valves 22 and 23 at the front and rear of the pre-electrolysis tank 12 are closed, and the opening / closing valve 24 of the bypass passage 25 is opened. Saline solution can be supplied to each main electrolytic cell 8. Therefore, by opening / closing each on-off valve 22, 23, 24, the pre-electrolysis tank 12 and the bypass passage 25 can be freely selected and used, and the temperature, water quality, climate and other conditions of the installation place can be controlled. Accordingly, the front electrolysis tank 12 and the bypass passage 25 can be freely used properly.

The diluted saline solution that has passed through the pre-electrolysis tank 12 or the bypass passage 25 is pressure-fed to each main electrolysis tank 8 in the apparatus main body 1 and is electrolyzed through each main electrolysis tank 8 in sequence. By this electrolysis, chlorine is generated at the anode and hydrogen gas is generated at the cathode. On the cathode side, sodium ions and hydroxide ions generate caustic soda, and chlorine generated at the anode and caustic soda generated at the cathode react with each other to generate sodium hypochlorite.

Since the diluted saline solution is electrolyzed in each main electrolytic cell 8 each time it passes through each main electrolytic cell 8, the concentration of sodium hypochlorite in the diluted saline solution is transferred to the main electrolytic cell 8 in the subsequent stage. The sodium hypochlorite solution has a predetermined concentration when it is taken out from the main electrolyzer 8 at the final stage.

The hydrogen gas generated by electrolysis in each main electrolyzer 8 rises in the dilute saline solution or sodium hypochlorite solution to separate into gas and liquid, and accumulates in the upper part of each apparatus main body 1. As shown in FIG. 10 and FIG. 14, a hydrogen gas vapor layer A is formed in each main electrolytic cell 8. In other words, in each main electrolyzer 8, there is a gas layer A at the top and a liquid layer B at the bottom.
You can

A gas layer formed inside each main electrolytic cell 8
The hydrogen gas of A is an internal pressure type in which each main electrolyzer 8 is hermetically sealed, and the gas layer A side is connected in series by gas layer piping 41 as shown in FIG. Hydrogen gas generated one after another is sequentially sent to the main electrolysis tank 8 side at the rear stage side, and then goes out from the main electrolysis tank 8 at the final stage side through the gas pipe 29 to the gas-liquid separator 13 side.

In each of the main electrolyzers 8, the production of sodium hypochlorite and the gas-liquid separation of hydrogen gas are performed as follows.
That is, the diluted saline solution sent to the main electrolysis tank 8 is shown in FIG.
As shown in, enter the lower chamber 65 on the upstream side of the main electrolytic cell 8,
Ascends through the openings 66 of the partition plate 64 and enters the ascending passage 45. Since the electrode unit 44 is arranged in the ascending passage 45 in correspondence with each opening 66 of the partition plate 64, most of the diluted saline solution that has entered the ascending passage 45 from each opening 66 is in the electrode unit 44.
It goes up while being electrolyzed through a plurality of electrodes 57, 58 of.

At this time, hydrogen gas is generated in the dilute saline solution in the ascending passage 45, but the hydrogen gas rises together with the dilute saline solution in the form of fine bubbles, and when it rises above the liquid surface of the dilute saline solution, bubbles are produced. The boiled off, the diluted saline solution and the hydrogen gas are separated into gas and liquid, and the vapor layer A of the hydrogen gas accumulates above the liquid surface of the diluted saline solution in the ascending passage 45.

Since the electrode unit 44 is provided in the ascending passage 45, the flow of the diluting saline solution in the ascending passage 45 can be promoted by the temperature rise of the diluted saline solution and the generation of hydrogen gas by electrolysis. Moreover, in the ascending passage 45, in addition to the electrode unit 44, there are cooling sections 49, 50 of the cooling means 51 on both sides thereof, and the cooling water flowing through the cooling sections 49, 50 allows the diluted saline solution in the ascending passage 45 to be diluted. Is cooled near the electrode unit 44. Therefore, the temperature of the diluted saline solution in the rising passage 45 does not rise abnormally due to electrolysis.

Incidentally, the diluted salt solution in the main electrolytic cell 8 is cooled by a cooling means so that the temperature on the outlet side becomes about 10 to 25 ° C.
It is cooled by each cooling unit 49, 50 of 51. this is,
If the temperature at the outlet side is lower than 10 ° C,
The burden on the electrode during electrolysis becomes extremely large, and the main electrolyzer
This is to prevent toxic components from being generated by side reactions during electrolysis when the temperature of the diluted saline solution in 8 reaches a temperature that greatly exceeds 25 ° C.

Therefore, the temperature on the outlet side of the diluted saline solution is 10
Each cooling unit 49, 5 of the cooling means 51 is controlled so as to be about 25 ° C.
By cooling the dilute saline solution at 0, most electrodes 57,5
The diluted salt solution can be electrolyzed with a low load of 8 and high electrolysis efficiency, and at the same time, there is no risk of producing toxic components during electrolysis.

The cooling parts 49 and 50 are U-shaped,
The cooling pipes of the cooling parts 49, 50 are provided on the front and rear sides of the electrode unit 44, and the diluted saline solution on the front and rear sides of the electrode unit 44 is cooled by the cooling pipes. Therefore, as shown in FIG. Convection occurs so that the diluted saline solution in the electrode unit 44 rises and the diluted saline solution on the front and rear sides of the electrode unit 44 descends.

Therefore, the diluted saline solution that has risen in the electrode unit 44 as a whole flows through the upper end of the lower partition plate 47 to the descending passage 46 side, descends through this descending passage 46, and descends to the next stage. Although it flows from the lower chamber 65 to the ascending passage 45, a part of the diluted saline solution flows into the electrode unit 44 from the lower side by convection in the ascending passage 45 and is electrolyzed again. In particular, the diluted saline solution that flows through the electrode unit 44 to the next stage and the diluted saline solution that is electrolyzed and circulates in the ascending passage 45 while flowing through the upflow passage 45 due to shunting, drift, convection, and the like are mixed. As a result, the electrolytic surface of the electrode unit 44 can be effectively used, and the electrolytic efficiency of the electrode unit 44 is improved.

As described above, the diluted saline solution in each main electrolytic cell 8 is supplied to each of the ascending passages 4 at the flow velocity and the flow rate corresponding to the supply amount.
5. As it goes up and down through the descending passage 46 and flows to the downstream side repeatedly, and is electrolyzed by the electrode unit 44 with convection in each ascending passage 45, the electrolysis efficiency of diluted saline is significantly improved. To do.

Further, the hydrogen gas generated in each ascending passage 45 at the time of electrolysis goes to the downstream side while repeating ascending and descending via each ascending passage 45 and descending passage 46 because the main electrolysis tank 8 is of the sealed internal pressure type. In the meantime, the hydrogen gas is accumulated in the vapor layer A on the upper side of the liquid layer B by gas-liquid separation from the diluted saline solution. Therefore, gas-liquid separation can be performed on the entire liquid surface of the diluted saline flowing through the ascending passage 45 and the descending passage 46, and hydrogen gas can be surely separated by gas as compared with the open-air type.

Moreover, the dilute saline solution convects in each ascending passage 45, and ascends via the ascending passage 45 and the descending passage 46.
Since the descent is repeated, the gas-liquid separation of hydrogen gas is very good as compared with the case where the diluted saline solution simply flows in the horizontal direction. That is, the main electrolysis tank 8 is of a self-gas-liquid separation type in which gas-liquid separation can be surely performed inside itself.

The hydrogen gas separated from the dilute saline solution in the main electrolytic bath 8 has a gap between each upper partition plate 48 and the lid 43, so that one gas layer is formed in each main electrolytic bath 8. Since the gas layer A is connected to each main electrolytic cell 8 by the gas layer pipe 41, the hydrogen gas in each main electrolytic cell 8 is sequentially sent to the rear side.

A transparent synthetic resin plate is used for the lid 43 of each main electrolysis tank 8. If the opening / closing door 3 of the apparatus body 1 is opened and the inside of the lid 43 is looked into, Each electrode unit
Since it is possible to easily confirm the adhesion state of the 44 scales, it is possible to easily inspect the main electrolytic cell 8.

When the diluted saline solution is discharged from the main electrolyzer 8 at the final stage, it is a sodium hypochlorite solution having a predetermined concentration.
This sodium hypochlorite solution is passed through the liquid pipe 30 and the gas-liquid separator.
It is sent to the bottom side of 13. On the other hand, on the upper side of the gas-liquid separator 13, the hydrogen gas that has been gas-liquid separated in each main electrolysis tank 8 is sent from the final-stage main electrolysis tank 8 via the gas pipe 29, and in this gas-liquid separator 13. The final gas-liquid separation is performed.

Each main electrolysis tank 8 is of a sealed internal pressure type, and the diluted salt solution in the main electrolysis tank 8 is pressurized by a salt water pump or the like and is in a pressurized state. The pressure and the pressure of the hydrogen gas are always in a balanced state with a substantially equal pressure. Even if there is some variation in the amount of hydrogen gas generated in each main electrolyzer 8, the gas layer A of each main electrolyzer 8 is connected to one, so to speak, by the gas layer piping 41.
Since the volume of A as a whole is very large, it is possible to absorb the variation in the amount of hydrogen gas generated, and the pressure fluctuation, especially the pressure fluctuation in the main electrolyzer 8 at the final stage is extremely small. can do.

Since the sodium hypochlorite solution and the hydrogen gas that have passed through the main electrolyzer 8 at the final stage are pressure-fed above and below the gas-liquid separator 13, the pressure fluctuation in the gas-liquid separator 13 is also very large. The amount of sodium hypochlorite liquid and the pressure of hydrogen gas are in a balanced state.

In the gas-liquid separator 13, the float 93 in the separator body 89 receives the buoyancy of the sodium hypochlorite solution to balance the valve 93 at a position slightly lower than the closed state shown in FIG. 96
Thus, the nozzle hole 91 is held in a throttled state. Therefore, as long as the liquid level of the sodium hypochlorite solution in the separator body 89 does not change, the degassing valve 98 stabilizes in a substantially constant throttled state. Then, the hydrogen gas that has entered the upper portion of the separator body 89 is stably ejected from the nozzle hole 91 in the throttled state, and is discharged to the gas discharge tube 14 via the gas discharge pipe 31.

In this case, the hydrogen gas has already been vapor-liquid separated in each of the main electrolyzers 8 in the preceding stage, and the hydrogen gas after the vapor-liquid separation is separately separated from the sodium hypochlorite liquid in the vapor-liquid separator 13 Since it is discharged from the nozzle hole 91, the separation efficiency of the sodium hypochlorite liquid and hydrogen gas is good, and the sodium hypochlorite liquid is jetted to the gas discharge pipe 31 side together with the hydrogen gas. At the same time, the possibility of the occurrence of hydrogen gas is greatly reduced, and at the same time, hydrogen gas is not mixed in the sodium hypochlorite solution taken out from the separator body 89.

Even if the amount of hydrogen gas generated fluctuates, it is absorbed by the volume change of the gas layer A in each main electrolyzer 8, so the gas pressure in the gas-liquid separator 13 does not fluctuate. The hydrogen gas in the gas-liquid separator 13 can always be discharged from the nozzle hole 91 at a substantially constant pressure. Therefore, the gas-liquid separator 13
The valve body 96 no longer repeatedly vibrates vertically due to the pressure fluctuation of the hydrogen gas in the valve body 96 and the nozzle hole 91.
It is possible to prevent damage such as abrasion of the contact part with the gas-liquid separator 13
At the same time, the durability can be improved, and at the same time, generation of abnormal noise when hydrogen gas escapes can be prevented.

Even in the gas-liquid separator 13, hydrogen gas can be gas-liquid separated. That is, a very small amount of hydrogen gas is mixed in the form of bubbles in the sodium hypochlorite liquid that enters the gas-liquid separator 13, but this hydrogen gas is the sodium hypochlorite liquid in the separator body. While passing through the lower part of 89, it is separated into gas and liquid inside and goes upward.

Therefore, the sodium hypochlorite liquid that has passed through the gas-liquid separator 13 is in a state of containing almost no hydrogen gas, and this sodium hypochlorite liquid is taken out from the liquid take-out pipe 33 and It is pumped to the storage tank. The hydrogen gas discharged from the nozzle hole 91 of the gas-liquid separator 13 is sent to the gas discharge tube 14 via the gas discharge pipe 31, and then diluted by the air blown from the gas dilution fan 15 to generate hydrogen gas. The diluted gas having a low concentration is released from the gas release cylinder 14 upward into the atmosphere.

At this time, even if the sodium hypochlorite liquid enters the gas discharge cylinder 14 together with the hydrogen gas, if the amount is extremely small, it should be discharged from the gas dilution fan 15 to the atmosphere by blowing air. You can When the amount of sodium hypochlorite solution is large, it cannot be released to the atmosphere, and the sodium hypochlorite solution enters the fan case 36 of the gas dilution fan 15 through the gas release cylinder 14.

However, since the gas dilution fan 15 is fixed to the device body 1 and the drain pipe 39 that connects the bottom of the fan case 36 of the gas dilution fan 15 and the drain pan 9 in the device body 1 is provided, Even if the sodium hypochlorite solution enters 36, it can be discharged to the drain pan 9 in the apparatus main body 1 through the drain pipe 39. Therefore, the sodium hypochlorite solution ejected from the gas-liquid separator 13 does not collect in the fan case 36.

When repairing the main electrolysis tank 8, remove the diluted saline solution, remove the pipes, etc., then release the fixation with the stopper, and pull out the main electrolysis tank 8 along the guide rail 7 forward. The main electrolyzer 8 can be removed relatively easily. When the upper main electrolysis tank 8 is removed, the work can be further facilitated by using an appropriate simple type lifter or the like.

Next, the bolts or the like for fixing the lid body 43 to the tank main body 42 are pulled out, and the lid body 43 is removed upward, so that the cooling units 49 and 50 of the cooling means 51 are integrated with the lid body 43. Get out of the body 42. At this time, since the electrode unit 44 remains in the tank body 42, if the conductive plates 60, 61 are pulled out upward, the electrodes 57, 58 of each electrode unit 44 are separated into the anode side and the cathode side, It will separate from the body 42 separately. Also each partition board 4
7,48 and the partition plate 64 remain in the tank main body 42.

Therefore, the electrode unit 44 in the tank body 42, the cooling parts 49 and 50 of the cooling means 51, and the partition plates 47 and 48 are
Although there are multiple units inside, the electrode unit 44 can be divided into two parts, one for the anode side and the other for the cathode side, and can be disassembled into four parts including the cooling means 51 and the partition plates 47, 48, etc. 42
There is an advantage that work at the time of internal repair can be done very easily.

Since the electrode unit 44 is divided into the anode side and the cathode side, the electrodes 57 and 58 can be exchanged separately for the anode side and the cathode side. Each cooling section 49, 50 of the cooling means 51 is detached integrally with the lid body 43, but when replacing a part thereof, if a pipe joint is removed, a pair of cooling sections 49, 50 corresponding to each electrode unit 44, It can be pulled out from the lid 43 every 50 times.

When reassembling, the partition plate etc. should be the tank body.
Since it is on the 42 side and there are notches on both ends,
Conductive plates 60, 6 on the anode side and the cathode side so that 8 are alternated.
It suffices to insert 1 into each notch, whereby each electrode unit 44 can be easily mounted in the tank main body 42.
The spacing between the electrodes 57 and 58 may be uniquely determined by the spacer when one of the electrodes 57 and 58 is provided with a spacer and the spacer is assembled.

Next, the lid 43 is placed on the tank body 42 and fixed with bolts or the like. When the lid 43 is placed, the cooling parts 49, 50 are inserted into the ascending passages 45 of the tank body 42 so that the cooling parts 49, 50 of the cooling means 51 are located in front of and behind the electrode units 44. The pair of cooling parts 49, 50 sandwiching each electrode unit 44 are integrally connected by the connecting part 67. Since the connecting part 67 is on the upper side of the electrode unit 44, the connecting part 67 and the electrode unit 44 are connected.
Does not interfere with each other, and the lid 43 can be easily attached.

In this sodium hypochlorite production apparatus, each main electrolysis tank 8 is of a sealed internal pressure type, and the main electrolysis tanks 8 are connected to each other by the liquid layer pipe 40 and the gas layer pipe 41. It is not necessary to arrange them all at the same height as in the open type. Therefore, for example, in the lower stage of the device body 1 as in the embodiment,
Each main electrolysis tank 8 can be placed at any position and height, such as by arranging four main electrolysis tanks 8 on the left and right, and it is possible to design according to the installation location and to downsize the entire device. It is possible.

In the embodiment, the case where four main electrolysis cells 8 are connected in series is illustrated, but the present invention is not limited to this, and two main electrolysis cells 8 may be arranged vertically. Good, one main electrolyzer 8 with the ability to match the electrolysis capacity of four
You only need to provide one. In addition, a diluted saline solution producing device that produces diluted saline solution from sodium chloride may be provided in front of the diluted saline solution supply pipe 11.

When the level at which the sodium hypochlorite solution reaching the liquid storage tank 99 is released from the liquid take-out pipe 33 into the tank is positioned at the bottom of the tank, it is possible to prevent the residual hydrogen gas from mixing into the liquid storage tank 99. it can.

[0101]

According to the present invention as set forth in claim 1, an electrolytic cell for electrolyzing a dilute saline solution to produce a sodium hypochlorite solution.
8 and a gas-liquid separator 13 for separating the hydrogen gas generated in the electrolytic cell 8 from the sodium hypochlorite liquid into a liquid-gas separator, the electrolytic cell 8 is of a sealed internal pressure type. The gas-liquid separator 13 includes a gas vent valve 98 on the upper side and a gas vent valve 98 on the lower side depending on the liquid level of the sodium hypochlorite solution.
It is equipped with a float 93 that opens and closes the
Since the upper side and the lower side of 89 are connected respectively,
The gas and liquid can be separated into sodium hypochlorite liquid and hydrogen gas at 8 and the hydrogen gas and sodium hypochlorite liquid that have already been gas-liquid separated at the electrolyzer 8 can be sent separately to the gas-liquid separator 13. Since the hydrogen gas is removed from the gas release valve 98 in the gas-liquid separator 13, the separation efficiency between the sodium hypochlorite liquid and the hydrogen gas is good, and the hydrogen gas can be prevented from being mixed into the sodium hypochlorite liquid.

Further, the gas vent valve 98 of the gas-liquid separator 13 has a structure which opens and closes by the float 93 according to the liquid level of the sodium hypochlorite solution on the lower side thereof. As long as there is no fluctuation, it stabilizes in the throttled state.
The hydrogen gas can be stably discharged from 98, the pressure fluctuation of the hydrogen gas is reduced, and at the same time, the gas release valve 98 of the gas-liquid separator 13 can be prevented from being damaged and the abnormal noise can be prevented. There is an advantage that the ejection of the sodium hypochlorite solution can be prevented.

According to the present invention as set forth in claim 2, in the invention as set forth in claim 1, a plurality of electrolysis cells 8 are provided, and each electrolysis cell 8 is provided with an upper gas layer pipe 41 and a lower liquid layer. Since it is connected in series with the pipe 40, hydrogen gas can be separated into gas and liquid in each electrolysis tank 8, the effective separation area becomes very large, the separation efficiency of gas-liquid separation is significantly improved, and each electrolysis is performed. The hydrogen gas and the sodium hypochlorite solution that have been gas-liquid separated in the tank 8 can be separated into the gas layer A and the liquid layer B and sent to the gas-liquid separator 13 separately.

Further, since the gas layer A of each electrolytic cell 8 becomes one via the gas layer piping 41, even if there is some variation in the amount of hydrogen gas generated in each electrolytic cell 8, each electrolytic cell 8 The variation can be absorbed as a whole, and the pressure fluctuation of hydrogen gas can be reduced. Moreover, since the open area of the liquid surface of each electrolytic cell 8 is wide and hydrogen gas is gently discharged from the sodium hypochlorite solution in the form of minute bubbles, pressure fluctuations in each electrolytic cell 8 are less likely to occur. .

According to the present invention as set forth in claim 3, in the invention as set forth in claim 1 or 2, the electrolytic cell 8 at the final stage of the plurality of electrolytic cells 8 connected in series is gas-liquid. Separator
Since it is connected to 13, a single gas-liquid separator 13 is sufficient for a plurality of electrolytic cells 8 and the structure can be simplified.

According to the present invention described in claim 4, in the invention described in claim 1, 2 or 3, the cell body of the electrolytic cell 8 is
A plurality of ascending passages 45 and descending passages 46 are alternately formed in the flow direction of the dilute saline solution in the tank 42, and a gas layer of hydrogen gas over the passages 45, 46 is formed on the upper side in the tank body 42. Since A can be performed, the diluted salt solution flows while repeatedly rising and falling in the tank main body 42, so that the efficiency of gas-liquid separation of hydrogen gas is greatly improved and troubles due to hydrogen gas are reduced.

According to the present invention of claim 5, in the invention of claim 1, 2, 3 or 4, the width of the ascending passage 45 is made large and the width of the descending passage 46 is made small. Inside the ascending passage 45, the electrode unit 44 and the cooling parts 49, 50 of the cooling means 51.
Since the cooling units 49 and 50 are attached to the lid 43 that is detachably attached to the tank body 42, the electrode unit 44 and the cooling units 49 and 50 are efficiently arranged in the tank body 42. it can. Further, since the electrode unit 44 is provided in the ascending passage 45, the flow of the diluted saline solution can be promoted by the temperature rise due to electrolysis and the generation of hydrogen gas.

Moreover, since the ascending passage 45 has a large width and the electrode unit 44 and the cooling parts 49, 50 are provided in the ascending passage 45,
The convection of the diluted saline solution is generated in the ascending passage 45.Therefore, the diluted saline solution that flows past the electrode unit 44 to the next stage is circulated in the ascending passage 45 due to shunting, drifting, convection, etc. However, it is mixed with the dilute saline solution that is electrolyzed and flows to the next stage, so that the electrolytic surface of the electrode unit 44 can be effectively used, and the electrolytic efficiency of the electrode unit 44 is improved.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus for producing sodium hypochlorite, which illustrates an embodiment of the present invention.

FIG. 2 is a left side view of the sodium hypochlorite generation device that illustrates one embodiment of the present invention.

FIG. 3 is a rear view of the sodium hypochlorite production apparatus that illustrates one embodiment of the present invention.

FIG. 4 is a right side view of the sodium hypochlorite generation device illustrating an embodiment of the present invention.

FIG. 5 is a front view of the lower side of the sodium hypochlorite production apparatus that illustrates one embodiment of the present invention.

FIG. 6 is a configuration diagram of an apparatus for producing sodium hypochlorite, which illustrates an embodiment of the present invention.

FIG. 7 is a partially cutaway front view of a main electrolytic cell illustrating an embodiment of the present invention.

FIG. 8 is a partially cutaway plan view of a main electrolytic cell illustrating an embodiment of the present invention.

FIG. 9 is a partially cutaway side view of a main electrolytic cell illustrating an embodiment of the present invention.

FIG. 10 is an enlarged cross-sectional view of the main part of the main electrolytic cell illustrating one embodiment of the present invention.

FIG. 11 is a plan cross-sectional view of a front electrolysis tank illustrating an example of the present invention.

FIG. 12 is a partially cutaway side view of a front electrolysis cell illustrating an embodiment of the present invention.

FIG. 13 is a cross-sectional view of a gas-liquid separator illustrating an example of the present invention.

FIG. 14 is a connection diagram of a main electrolytic cell and a gas-liquid separator illustrating an embodiment of the present invention.

FIG. 15 is a flowchart at the start of automatic operation illustrating an embodiment of the present invention.

FIG. 16 is a flowchart at the time of automatic stop illustrating an embodiment of the present invention.

[Explanation of symbols]

 1 Main unit 8 Main electrolyzer 11 Diluted saline supply pipe 12 Preliminary electrolyzer 13 Gas-liquid separator 14 Gas discharge cylinder 15 Gas dilution fan 42 Tank main body 43 Lid 44 Electrode unit 45 Upward passage 46 Downward passage 49 Cooling section 50 Cooling unit 51 Cooling means 89 Separator body 93 Float 98 Gas vent valve

Claims (5)

[Claims] 1. An electrolytic cell (8) for electrolyzing dilute saline to produce a sodium hypochlorite solution, and hydrogen gas generated in this electrolytic cell (8) is separated into a gas-liquid separation from the sodium hypochlorite solution. In the sodium hypochlorite generator with the gas-liquid separator (13)
The electrolytic cell (8) is of a sealed internal pressure type, and the gas-liquid separator (13) has a gas vent valve (98) on the upper side and a gas vent valve depending on the liquid level of the sodium hypochlorite solution on the lower side. Float (9)
3), and a sodium hypochlorite generation device characterized in that the electrolytic cell (8) and the upper side and the lower side of the separator body (89) are connected to each other. 2. A plurality of electrolysis cells (8) are provided, and each electrolysis cell (8) is provided with an upper gas layer pipe (41) and a lower liquid layer pipe (4).
0) is connected in series with the sodium hypochlorite generator according to claim 1. 3. The electrolytic cell (8) at the final stage of the plurality of electrolytic cells (8) connected in series is connected to the gas-liquid separator (13). 2. A sodium hypochlorite generator according to item 2. 4. A plurality of ascending passages (45) and descending passages (46) are alternately formed in the electrolytic cell (8) in the tank body in the flow direction of the dilute saline solution. The sodium hypochlorite production according to claim 1, 2 or 3, characterized in that a gas layer (A) of hydrogen gas straddling each passage (45) (46) is formed on the upper side of the chamber. apparatus. 5. The ascending passage (45) has a large width and the descending passage (46) has a small width, and the electrode unit (44) and the cooling section of the cooling means (51) are provided in the ascending passage (45). (49) (50) and place,
The cooling unit (4) is attached to the lid (43) that is detachably attached to the tank body (42).
9) (50) is attached, Claims 1, 2, 3
Or the sodium hypochlorite generator according to item 4.