JPH08229575A - Device for removing dissolved oxygen in water - Google Patents

Abstract

PURPOSE: To assure the smooth and safe operation of a device and to save electric energy by making it possible to easily decrease or remove dissolved oxygen in water and controlling the amt. of gaseous oxygen to be excessively generated. CONSTITUTION: The water to be treated is brought into contact with the cathode 7 side of a solid high-molecular electrolyte electrode vessel 1 and a water system separate from the water to be treated with the anode 8 side, respectively. A primary removal operation is executed by energization while the energization quantity is controlled. The treated water subjected to the primary removal operation is thereafter passed into a gaseous hydrogen chamber 21. The treated water is further introduced from this gaseous hydrogen chamber 21 into a catalyst resin column 27, where the water is passed through a catalyst resin bed 29 of palladium, etc., and is then subjected to a secondary removal operation. The device capable of easily decreasing or removing the dissolved oxygen in the water by these two removal operations is constituted. The control of the energization quantity for the primary removal operation is executed via a controller by a liquid level switch 22 installed in the gaseous hydrogen chamber 21. If gaseous hydrogen in the gaseous hydrogen chamber 21 increases as a result of the control, the control is further executed by opening and closing an automatic stop valve 23 installed in the upper part of the gaseous hydrogen chamber 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for removing dissolved oxygen in water.

[0002]

2. Description of the Related Art For example, the applicant of the present patent application discloses Japanese Patent Application No. 6-3
No. 1355, which was previously proposed, in which the treated water that has been subjected to the primary removal operation of dissolved oxygen in the water to be treated by the cathode treatment of the solid polymer electrolyte electrode tank is passed through a catalyst layer such as palladium and When performing the subsequent removal operation, the amount of electricity supplied to the electrodes is controlled by the detection signal of the amount of gaseous hydrogen from the detector installed in the processing chamber in the catalyst resin tower.

[0003]

Although the above-mentioned apparatus has some practicality, it has a drawback that the resin adheres to the gaseous hydrogen detector due to expansion of the resin due to backwashing of the resin tower, causing malfunction. There is.

The present invention was devised by focusing on such drawbacks.

[0005]

A process chamber in which a catalyst layer for removing dissolved oxygen in water is layered is provided in a main body of a catalyst resin column, and the process chamber communicates with the process chamber through a valve, and further, to the main body of the catalyst column. An integrated or separate gaseous hydrogen chamber is interposed between the processing chamber and the hydrogen dissolving device to communicate with each other, and the energizing amount control device that operates according to the detection signal of the gaseous hydrogen amount of the detector is used to dissolve the hydrogen. The device is electrically connected.

Further, a hydrogen dissolving device is constituted by a solid polymer electrolyte electrode tank in which the water to be treated is brought into contact with the cathode side and a water system different from the water to be treated is brought into contact with the anode side, or the hydrogen dissolving device is constituted. Consists of a hydrogen cylinder.

Further, an automatic opening / closing valve which opens / closes in response to a detection signal is provided in the gaseous hydrogen chamber.

[0008]

Although hydrogen is dissolved in the water to be treated by the hydrogen dissolving device, undissolved hydrogen gas remains in the water to be treated and is stored in the hydrogen gas chamber, and the amount of hydrogen gas is detected by the detector. Then, the control device operates according to the detection signal of the detector to control the amount of electricity supplied to the hydrogen dissolving device.

The control is such that when the amount of gaseous hydrogen is large, the amount of electricity supplied to the hydrogen dissolving device is reduced to reduce the amount of gaseous hydrogen generated in the device, and when the amount of gaseous hydrogen is small, the amount of electricity supplied to the hydrogen dissolving device is reduced. By increasing the amount of gaseous hydrogen generated in the apparatus to keep the amount of gaseous hydrogen in the gaseous hydrogen chamber within a certain range, the operation of the apparatus is smoothed, and power consumption is saved and hydrogen consumption ( In the case of hydrogen cylinders).

When the amount of gaseous hydrogen in the gaseous hydrogen chamber is increasing due to this detection signal, the automatic opening / closing valve is intermittently opened and closed to keep the amount of gaseous hydrogen in the chamber within a certain range. Smooth operation of the equipment.

The automatic open / close valve is operated by the control device at the same time as or differently from the hydrogen dissolving device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of a dissolved oxygen removing apparatus according to the present invention. FIG. 1 is a schematic illustration of a first embodiment and FIG. 2 is a schematic illustration of a second embodiment. In the figure, 1 is a solid polymer electrolyte electrode tank, and the solid polymer electrolyte electrode tank 1 is a first inlet / outlet partitioned by a solid polymer electrode membrane 4 constituting a solid polymer electrolyte electrode 3 housed in a tank body 2. A path 5 and a second entrance / exit path 6 are provided, and a cathode 7 is arranged on the side of the first entrance / exit path 5 so as to exist in almost the entire area along the path 5, and on the side of the second entrance / exit path 6 side. An anode 8 is arranged so as to exist in almost the entire area along the path 6, and the cathode 7 and the anode 8 constitute the solid polymer electrolyte electrode 3 with the solid polymer electrode film 4.

Inlet valves 9, 10 on one end side of the tank body 2,
Power is supplied to the solid polymer electrolyte electrode 3 to the first and second inlet / outlet passages 5 and 6 communicating with the outside through the outlet valves 11 and 12 on the other side, and liquid (water) can be energized. The feed water 13 and 14 having porosity or gaps are filled, and the water to be treated injected into the first inlet / outlet path 5 from the valve 9 is forcedly passed through the cathode-side power feed 13, and the cathode 7 is brought into contact with the cathode 7 during passage. Then, it is discharged from the outlet valve 11. Further, the deionized water is forcibly passed from the inlet valve 10 to the second inlet / outlet path 6 through the anode-side power supply body 14, and is brought into contact with the anode 8 when passing through the outlet valve 12 to be returned to the deionized water tank 20. There is.

The cathode side power supply 13 is a cathode plate 15
In addition, the anode side power supply body 14 is electrically connected to the DC power supply section 31 via the anode plate 16, respectively.

Further, the inlet valve 9 of the first inlet / outlet path 5 is connected to the treated water tank 19 via the pump 17, and the inlet valve 10 of the second inlet / outlet path 6 is connected to the pure water tank 20 via the pump 18. . Further, the first inlet / outlet path 5 communicates with the gaseous hydrogen chamber 21 via the outlet valve 11, and communicates with the catalytic resin tower 27 from the gaseous hydrogen chamber 21 via the opening / closing valve 25. On the other hand, the second inlet / outlet path 6 communicates with the pure water tank 20 via the outlet valve 12 as described above.

A liquid level switch 22 for detecting the amount of gaseous hydrogen is provided in the gaseous hydrogen chamber 21, and an automatic opening / closing valve 2 is provided above the liquid level switch 22.
3 are equipped. The liquid level switch 22 constituting the detector is electrically connected to the DC power supply unit 31 via a control device 32.

The catalyst resin tower 27 is provided with a processing chamber 33 in which a catalyst layer 29 made of palladium is layered under the tower body 28, and the upper portion of the processing chamber 33 communicates with the gaseous hydrogen chamber 21 via the opening / closing valve 25. The catalyst layer 29 communicates with the outside (outside of the tower) through an outlet valve 30 provided below the tower body 28.

The valve 24 above the gaseous hydrogen chamber 21 and the valve 26 above the catalyst resin tower 27 are gas relief valves.

Thus, the water to be treated passes from the treated water layer 19 through the pump 17 and the valve 9 to the first inlet / outlet path 5 of the solid polymer electrolyte electrode tank 1, that is, the cathode side power supply body 13.
Is supplied to the section and is brought into contact with the cathode 7 to perform a primary removal operation. During this primary removal operation, the reaction is performed according to the following equation.

[0020]

Embedded image

The treated water that has undergone the primary removal operation enters the gaseous hydrogen chamber 21 through the outlet valve 11 along with unreacted hydrogen and dissolved oxygen, and further passes from the gaseous hydrogen chamber 21 through the opening / closing valve 25 and the catalyst resin tower 27. Then, the resin layer 29 is communicated with the resin layer 29 to perform a secondary removal operation, and the resin layer 29 is discharged to the outside through the outlet valve 30.

Then, when the treated water passes through the catalyst layer 29, that is, during the secondary removal operation, the dissolved oxygen remaining in the water is removed according to the equation (2).

[0023]

Embedded image

Further, a water system different from the water to be treated, that is, pure water, is supplied from the pure water tank 20 to the second inlet / outlet path 6, that is, the anode side power supply body 14 via the pump 18 and the valve 10, and comes into contact with the anode side 8 to be next. Reacts like a formula.

[0025]

Embedded image

The water that has reacted as in the equation (3) returns to the pure water tank 20 through the valve 12 together with oxygen.

When part of the primary removal operation becomes a gas and accumulates in the gaseous hydrogen chamber 21 during operation of the apparatus, the pressure of the gaseous hydrogen causes the water surface of the indoor water to gradually decrease. When the water surface reaches a predetermined position, the liquid level switch 22 which is a detector provided at that position detects this, and the detection signal is transmitted to the control device 32. The amount of electricity supplied to the cathode 7 from the portion 31 is also controlled so as to generate a hydrogen amount that is set small in advance.

As a result of setting the amount of hydrogen generated at the cathode 7 to be small, the gaseous hydrogen in the gaseous hydrogen chamber 21 gradually dissolves in water, and the water surface in the gaseous hydrogen chamber 21 gradually rises. When the water surface reaches a predetermined height, the liquid level switch 22 detects the water surface, and the detection signal is transmitted to the control device 32. As a result, the amount of electricity supplied from the DC power supply unit 31 to the cathode 7 is returned to the original state. Return.

In addition, in spite of the above energization amount control,
When the water surface of the gaseous hydrogen chamber 21 does not stay within a certain range and further lowers, the gaseous hydrogen enters the catalyst resin tower 27, forms a hydrogen gas pool in the catalyst layer 29, and impedes the water flow. In order to prevent obstacles such as diminishing the effect of the catalyst,
As a result of the energization amount control, if the water level is controlled to generate a preset small amount of hydrogen and the water surface does not return to a predetermined position by the detection of the liquid level switch 22 after a certain time, gaseous hydrogen is supplied via the control device 32. The automatic opening / closing valve 23 provided at the upper part of the chamber 21 is opened and closed intermittently to remove the gas hydrogen chamber 21.
It keeps the amount of gaseous hydrogen in a certain range.

Here, the automatic opening / closing valve 23 is intermittently opened / closed because the secondary removing device using the catalyst layer 29 dissolves hydrogen gas, so that the water temperature is 25 ° C., 1.7 kgf / cm ² or more, and the water temperature is 5 ° C. Therefore, it is necessary to keep the pressure under 2.2 kgf / cm ² or more, and if the automatic opening / closing valve 23 is continuously opened, the pressure will drop and the secondary removal device will be obstructed. This is because it is necessary to prevent the pressure from decreasing. Automatic on-off valve 24 and solid polymer electrolyte electrode tank 1
Operate simultaneously or at different times under the control of the control device 32 by the detection signal.

The catalyst layer 29 may be made of rhodium or platinum.

The second embodiment shown in FIG. 2 uses a so-called water electrolysis tank 41 and an injection device 42 in contrast to the first embodiment in which the hydrogen dissolving apparatus is composed of the solid polymer electrolyte electrode tank 1.
Since the hydrogen dissolving apparatus 1'is constituted by and, the remaining points are almost the same as in the description of the first embodiment, and therefore will be omitted. In addition, 2
Reference numeral 0'denotes a pure water tank, 9'and 11 'valves.

As the injection device, for example, an ejector can be considered, and a hydrogen cylinder may be used instead of the water electrolysis tank 41.

In the case of a hydrogen cylinder, the detection signal controls the opening / closing of the on / off valve of the cylinder.

In each embodiment, the gaseous hydrogen chamber is separate from the catalyst resin tower main body 28, but it may be integrated. The backwashing of the resin tower is performed by closing the open / close valve 25.

[0036]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, by controlling the amount of gaseous hydrogen, the device can be operated smoothly and safely, and the amount of electric power can be saved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a first embodiment.

FIG. 2 is a schematic explanatory view of a second embodiment.

[Explanation of symbols]

 1 Solid Polymer Electrolyte Electrode Tank 2 Tank Body 3 Solid Polymer Electrolyte Electrode 4 Solid Polymer Electrode Membrane 5 First Inlet / Outgoing Passage 6 Second Incoming / Outgoing Passage 7 Cathode 8 Anode 9 Inlet Valve 10 Inlet Valve 11 Outlet Valve 12 Outlet Valve 13 Cathode Side feeder 14 Anode feeder 15 Cathode plate 16 Anode plate 17 Pump 18 Pump 19 Treated water tank 20 Pure water tank 21 Gas hydrogen chamber 22 Liquid level switch 23 Automatic opening / closing valve 24 Gas relief valve 25 Opening / closing valve 26 Gas relief valve 27 Catalyst Resin tower 28 Tower body 29 Catalyst resin layer 30 Outlet valve 31 DC power supply unit 32 Control device

Claims (4)

[Claims] 1. A processing chamber in which a catalyst layer for removing dissolved oxygen in water is layered is provided in a catalyst resin tower main body, communicates with this processing chamber via a valve, and is integral with or separate from the catalyst tower main body. The gaseous hydrogen chamber is placed between the processing chamber and the hydrogen dissolving device and communicated with each other, and the energization amount control device, which operates according to the detection signal of the gaseous hydrogen amount of the detector, is conducted to the hydrogen dissolving device. A device for removing dissolved oxygen from water. 2. The water according to claim 1, wherein the hydrogen dissolving device is constituted by a solid polymer electrolyte electrode tank in which the water to be treated is brought into contact with the cathode side and a water system different from the water to be treated is brought into contact with the anode side. Dissolved oxygen removal device. 3. The apparatus for removing dissolved oxygen in water according to claim 1, wherein the hydrogen dissolving apparatus comprises a water electrolysis tank or a hydrogen cylinder and an injecting apparatus. 4. An automatic opening / closing valve which opens / closes in response to a detection signal is provided in the gaseous hydrogen chamber.
Dissolved oxygen removal device according to the item.