JPH10259006A - Ozonizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To judge the operation state in the interior of an ozonizer by forming one or more among plural check and watching windows, made from a material through which light rays in an infrared range and a visible light are passed, attached to the ozonizer equipped with a main body tank, an opening and a closing covers attached to both the ends of the tank and a discharge tube having a resistance fuse in the interior of the tank. SOLUTION: When an electric current is sent from a power converter board 7 through a bushing 6 to main body tank 1 by a high frequency high voltage, a gap of about 1 mm between a discharge tube 3 and a cylindrical cooling tube 4 is made into a silent discharge resistance to generate a silent discharge from the discharge tube 3. A raw material air is introduced from an inlet 11 of the main body tank 1 and air ozonized through the gap of the silent discharge is sent from an outlet 12 to generate ozone. The purple of the silent discharge is watched from a checking and watching window 8 composed of a ZnSe material through which light rays from visible light to infrared light are passed to recognize the injection of electric power. The temperature is recorded by a recorder 10 of an infrared sensor part 9 attached to the checking and watching window 8 and the temperature abnormality of the resistance fuse 5 is measured to control the operation state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generator, and more particularly to an ozone generator provided with a viewing window provided in a main body tank of a closed container for generating ozone by applying a high voltage, and suitable for judging an internal operating condition. It relates to an ozone generator.

[0002]

2. Description of the Related Art As described in Japanese Patent Application Laid-Open No. 55-31460, an ozone generator is used for continuous process operation utilizing the oxidizing power of ozone such as a water treatment device using ozone. It is also used for sewage treatment and pulp bleaching. On the other hand, the internal structure of the ozone generator is disclosed in
As described in No. 4991, a discharge is generated between the electrodes,
A configuration in which air or oxygen is caused to pass through the place where the discharge is generated to generate an ozonized gas is known.

Conventionally, the rated output of an ozone generator (kg-O ₃
/ H) is adjusted by increasing or decreasing the number of discharge tubes arranged in the tank. In addition, silent discharge is generated by a discharge tube of an electrically parallel circuit. In order to improve the generation efficiency, silent discharge of a high frequency of about 1 kHz is performed by an inverter. Here, since the discharge tube is electrically a plurality of parallel circuits, when the discharge glass tube is thermally broken, the resistance fuse provided in each of the discharge tubes is blown and the thermally broken discharge is caused. The tube was cut off, and operation was to be performed with a discharge tube that discharges sound silently. Therefore, if the number of blown resistance fuses increases, the ozone output will decrease.

[0004]

In the conventional ozone generator, it is determined whether or not the resistance fuse has blown by using a monitoring panel to reduce the ozone output or to check a plurality of discharge tubes from the inspection window of the ozone generator. The presence or absence of silent discharge was visually determined. In the case where the resistance fuse determines blowout during operation, the former determination using the monitoring panel takes a long time to investigate the cause because there are various causes for the decrease in ozone output. If you were not experienced in color, it was difficult to tell which resistor fuse had blown and stopped discharging. In particular, when the raw material air is only oxygen, there is no N ₂ component, so the purple color of N ₂ gas by glow discharge is eliminated, and it becomes colorless with only O ₂ gas. Could not be determined.

[0005] A first object of the present invention is to provide an ozone generator capable of judging the internal operation state of an ozone generator during operation by allowing the resistance fuse blowing phenomenon to be monitored from the outside.

A second object of the present invention is to provide an ozone generator in which the window material is formed of a material that also transmits infrared rays when inspecting the internal condition, and that can detect an abnormality in temperature rise in addition to the shape. .

[0007]

To achieve the above object, an ozone generator according to the present invention comprises a main body tank, open / close covers attached to both ends of the main body tank, and an internal resistance fuse inside the main body tank. An ozone generator provided with a discharge tube, wherein at least one of a plurality of inspection viewing windows attached to the ozone generator is formed of a material that transmits an infrared region and a visible region. I do.

The band through which the material transmitting the infrared region and the visible region passes is a wavelength band of 0.6 to 20 μm. Further, the material forming the inspection viewing window is Zn.
Se or KCl material. Further, it is formed of a material that transmits the infrared region and the visible region, or
The inspection viewing window made of Se or KCl material is attached to the opening / closing cover on the inlet side through which the raw material air flows.
Further, an infrared sensor attached to the atmosphere side of the inspection viewing window of the ozone generator, a signal from the infrared sensor is input to detect a temperature rise abnormality inside the main body tank, and to control electric power input to the discharge tube. This is provided with a control unit that performs Further, the infrared sensor detects an abnormal temperature rise of the resistance fuse inside the main body tank, and a resistance fuse having a large resistance value among a plurality of resistance fuses is arranged at the portion of the infrared sensor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the ozone generator of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the structure of the ozone generator of the present embodiment, FIG. 2 is a side view thereof, FIG. 3 is a diagram showing an electric circuit of the ozone generator, and FIG.
FIG. 5 is a configuration diagram of the monitoring control of the ozone generator, FIG. 6 is a partial longitudinal sectional view showing the configuration of the resistance fuse, and FIG. 7 is a diagram illustrating the fusing characteristics. , FIG.
FIG. 4 is an explanatory diagram of a temperature coefficient of resistance.

As shown in FIGS. 1 and 2, the main body tank 1 has a cylindrical shape. Opening / closing covers 2 are provided at both ends of the main body tank 1 to seal the whole. The opening / closing cover 2 is configured to be detachable when inserting and assembling the cylindrical discharge tube 3 inside the main body tank 1 or when removing it during maintenance and inspection. A plurality of cylindrical cooling tubes 4 are symmetrically welded to the main body tank 1, and the discharge tubes 3 are arranged so as to face each other. The cylindrical cooling pipe 4 is grounded. The distance between the discharge tube 3 and the cylindrical cooling tube 4 is set to about 1 mm by a support ring (not shown). The material of the discharge tube 3 is a heat-resistant glass tube, and its inner surface is coated with a metallic coating. The discharge tube 3 is electrically connected to the right end of the resistance fuse 5 by a brush electrode, and the left end of the resistance fuse 5 is connected to an application line led through a bushing 6. A power converter panel 7 is connected to the application line, and the power converter panel 7 including an inverter and a transformer generates high-voltage power at a high frequency of about 1 kHz. That is, in the power converter panel 7, the input power is converted into direct current by a rectifier circuit (indicated by REC in FIG. 1), converted into a high-frequency switching current of about 1 kHz by an inverter, and this AC voltage is converted by a transformer (TR in FIG. 1). ), And is converted into a high-frequency high-voltage power supply, and power is injected through the bushing 6.

A raw material air inlet 11 is provided on one side of the main body tank 1 in the axial direction, and an outlet 12 is provided on the other side.
And flows out of the outlet 12 through the space between the cylindrical cooling pipe 4. The opening / closing cover 2 is provided with an inspection viewing window 8, and the inspection viewing window 8 is formed of a ZnSe material or a KCl material. Outside the main body tank 1, an infrared sensor section 9 is attached at an inspection viewing window 8,
This infrared sensor section 9 is connected to a recorder 10. Here, the infrared sensor unit 9 focuses on one of the resistance fuses 5 indicated by r 1 to rn in FIG. 3 through the inspection viewing window 8 of the main body tank 1, that is, the intensity of infrared light, that is, the surface temperature of the resistance fuse 5. The value is measured without contact.

The ozone generator configured as described above will be described in terms of an electric circuit. As shown in FIG. 3, the power guided from the power converter panel 7 into the main body tank 1 via the bushing 6 is: The current flows in parallel to the resistance fuses 5 indicated by r1 to rn, respectively, and the capacity of the glass material of the discharge tube 3 indicated by C1 to Cn and about 1 mm between the discharge tube 3 and the cylindrical cooling tube 4.
The ground is fed back through the intervals G1 to Gn. When high frequency and high voltage injection power is applied, the intervals (G1 to Gn)
) Becomes a silent discharge resistance, and since the high frequency is reversed, the capacitance to the silent discharge resistance are repeatedly seen as continuous discharge. As a result, the discharge tube 3 generates a silent discharge (also called a glow discharge) during the interval G via the glass material capacitance C, and power flows to the ground side of the cylindrical cooling tube 4. When the raw material air is introduced from the inlet 11 of the main body tank 1, it passes through the silent discharge interval G, becomes ozonized air, and flows out from the outlet 12, so that ozone can be generated.

FIG. 4 is a graph showing the light transmittance characteristics of the ZnSe material used as the material of the inspection viewing window 8.
Take the light transmittance η (%) and the wavelength λ (μm) on the horizontal axis,
This shows the relationship. The band where the wavelength λ is 0.4 to 0.7 μm, that is, the region indicated by [I] in FIG. 4 is a visible light region, and the band where λ is 2 to 14 μm, that is, [I] in FIG.
The region indicated by I] is a wavelength region in which the temperature can be detected by the various infrared sensor units 9. Generally, INSb or CdHgTe material is used for the detection element of the infrared sensor unit 9. Here, the measurement area can be set for each sensor. For example, it is easy to measure the temperature in the range of φ1 cm at a distance of 40 cm. As described above, by applying the ZnSe material to the inspection viewing window 8, the visible light region to the infrared light region (λ =
0.6 to 20 μm) and can be visually inspected.

As described above, since the purple color of the silent discharge from the discharge tube 3 can be seen from the plurality of inspection viewing windows 8 attached to the opening / closing cover 2, it is determined whether the power is injected through the resistance fuse 5. I understand. Further, the inspection viewing window 8 is conventionally made of a glass material, and transmits only the visible light region. Experiments have shown that a ZnSe material or a KCl material that transmits the region from visible light to infrared light is suitable. Therefore, in this embodiment, at least one of the plurality of inspection viewing windows is used.
Since it is mounted at a location, the temperature of the resistance fuse 5 can be measured by providing the infrared sensor unit 9 outside and recording the temperature with the recorder 10.

A configuration in the case where an abnormal temperature of the resistance fuse 5 is measured and used as an alarm in the control unit will be described with reference to FIG. In FIG. 5, an abnormality in the temperature rise of the resistance fuse 5 in the main body tank 1 is detected by the infrared sensor unit 9. That is, the signal detected by the detection element 9a is amplified by the amplifier 9b, the amplified signal is also displayed on the display tube 9c as a video pattern, and the signal amplified by the determiner 9d is set to a threshold value which is initially set. It is configured to output an alarm contact when exceeding, or to input to the control unit 7e of the power converter panel 7.

The power converter panel 7 converts the input power into direct current by a rectifier circuit (represented by REC), displays the converted direct current (denoted by DA), and detects an overcurrent by the direct current judging device 7a. And inputs it to the control unit 7e. The DC current is input to an inverter circuit (indicated by INV) via a reactance L, converted into a high-frequency switching current of about 1 kHz to display an AC voltage (indicated by AV) as described above, and an overvoltage by an AC voltage determination unit 7b. Is detected and input to the control unit 7e.

This AC voltage is boosted by a transformer (indicated by TR), converted into a high-frequency high-voltage power supply, and injected with power through a bushing 6. Since the control unit 7e controls the overall control system, the control unit 7e combines the rectifier circuit pulse control unit 7c and the inverter pulse control unit 7d to adjust the output power of the inverter circuit. Therefore, in the case of a failure of the ozone generator, first, an output from the determiner 9d is generated, and an internal abnormality is known. Causes an abnormality from the rectifier circuit to the inverter circuit to the transformer, so that a minor failure due to an internal abnormality can be determined at an early stage.

Here, the reason why the temperature rise abnormality of the resistance fuse 5 must be measured will be described with reference to FIGS. As shown in FIG. 6, the resistance fuse 5 is formed by flanges 5a at both ends and a cylindrical insulating case 5b. Since the configuration is such that the resistance fuse wire 5c is inserted inside and connected to both ends of the flange to be electrically coupled, the surroundings are filled with the decoupling agent 5d for absorbing heat at the time of fusing.

Therefore, when the current I flows through the resistance fuse 5, a heat energy of [R _t × I ² ] is generated by the resistance value Rt. Since this energy is surrounded by an insulator and has poor heat conduction, the energy is gradually radiated to the surface of the insulating case 5b.

On the other hand, the fusing characteristic of the resistance fuse 5 is represented by the fusing time TIME (sec) on the ordinate and the passing current I (A) on the abscissa, as shown in FIG. Becomes For example, when the current is I ₁ , the time TIME (sec) until fusing is increased, and when the current is I ₂ , the time until fusing is reduced, and the fusing is performed at the time indicated by S 1 (sec). The dotted line indicates an abnormal range of temperature rise in which the resistance fuse wire 5c shown in FIG. 6 does not melt and does not melt, but accumulates heat before melting. with at less than I ₁ indicates that it is safe. However, the resistance fuse 5 has manufacturing variations as shown in FIG. When the resistance value R _t (Ω) is plotted on the vertical axis and the temperature t (° C.) is plotted on the horizontal axis, even if the resistance value is R _t (Ω) at room temperature t ° C., the resistance fuse 5 generates heat when energized. When the temperature rises to T (° C.) and the temperature rise value becomes Δt, the resistance value also rises by _RT . Since this is a constant characteristic given as the temperature coefficient of resistance α _t (1 / ° C.) as shown in Equations 1 and 2, the resistance R at room temperature t ° C.
_{Since t} (Ω) has a variation ΔR, it can be seen that the positive side resistor fuse 5 is not preferable in terms of heat generation.

[0021]

R _T = R _t (1 + α _t Δt) [Ω] (Equation 1)

[0022]

Α _T = α _t / (1 + α _t (T−t)) [1 / ° C.] (Equation 2) Since the variation ΔR of this resistance is unavoidable in mass production, in this embodiment, the infrared ray is used. The part where the temperature rise abnormality of the resistance fuse 5 is detected by the sensor unit 9 is set at the position where the resistance fuse 5 having the maximum value of ΔR on the positive side is attached. This resistor fuse 5 earliest surface temperature rise than many from the relationship of alpha _t shown in Equations 1 and 2 pieces of resistors fuse 5 can sensitively early detection.

In FIG. 4, the reason why the abnormality detection by the temperature rise of the resistance fuse 5 of the judging device 9d is more sensitive than the overcurrent detection of the DC current judging device 7a is that each of the n parallel discharge tubes 3 Is provided with the resistance fuse 5, the current flowing therethrough becomes 1 / n, but the condition is set so that the current is detected at the rated current of the resistance fuse 5 having a small current.

If the judgment unit 9d is given to the control unit 7e not as a contact output but as an analog output, whether the overload operation is possible is determined by the temperature rise value of the resistance fuse 5 (this value is proportional to the ozone output value). ) If you monitor it,
Further, if the monitor focus of the detection element 9a is set to the cylindrical cooling pipe 4 side shown in FIG. This is because, in principle, the amount of generated ozone is low with respect to the electric power injected due to the principle of the ozone generator, and 90% or more of the generated heat is exhausted. However, if an abnormality occurs in the cylindrical cooling pipe 4,
This is because the internal temperature can be monitored by measuring the temperature.

In the case of the ZnSe material shown in FIG. 4, selenium gas may be generated when the surface comes into contact with an oxidizing fluid, so that ozone gas flows out from the outlet 12 side in order to maintain long-term safety. Therefore, since the ZnSe surface reacts with ozone to generate a small amount of selenium gas, as shown in FIG. 1, the inspection viewing window 8 on the opening / closing cover 2 side provided on the raw material air inlet 11 side is formed of a ZnSe material. Is good.
In this case, as described above, since the resistance fuse 5 has manufacturing variations, the resistance value is measured in advance, and the one with the largest resistance value is positioned at the position corresponding to the inspection viewing window 8 formed of ZnSe material. In this case, the temperature of the resistance fuse 5 having another small resistance value can be estimated as shown in FIG.

Normally, constant current control is performed.
With the above configuration, when the resistance fuse 5 is blown, the number thereof can be detected or estimated, so that the current value is controlled to be reduced in proportion to the number of the discharge tubes 3 that have not been blown. Therefore, the life of the resistance fuse 5 can be maintained long. Further, when it becomes necessary to increase the amount of generated ozone urgently, the temperature of the resistance fuse 5 can be monitored, so that the tolerance with respect to the limit of fusing can be known in advance, so that the amount of urgent ozone can be increased.

Although the description has been given of the case where the raw material gas inlet 11 side of the main body tank 1 shown in FIG. 1 is made of air, in the case of an ozone generator using an oxygen raw material, since there is no N ₂ gas, a colorless glow is generated by silent discharge. Since the discharge occurs, the presence or absence of the silent discharge could not be confirmed by the conventional visual inspection. However, in the present embodiment, since the internal temperature is measured by the infrared sensor unit 9, the presence or absence of the colorless glow discharge is determined by the generation of the heat. Since the determination can be made based on the presence / absence, it is also possible to determine the presence / absence of internal discharge even in the ozone generator when using the oxygen source.

[0028]

As described above, according to the present invention, the following effects can be obtained. In other words, by using an inspection viewing window made of a material that is also visible and transmits infrared light, it is possible to measure the heat generation state of the main internal parts with an infrared sensor unit (infrared thermometer) from the outside. Internal diagnosis can be performed from outside as it is. Further, since the inspection viewing window is formed of a material that transmits light in the visible wavelength band to the infrared wavelength band, the inside can be viewed by a visible camera or an infrared camera. Further, by using a ZnSe or KCl material as the inspection viewing window material, the internal shape and temperature abnormality can be measured without contact at low cost. When a ZnSe material is attached to the raw material air inlet side of the ozone generator, no oxide gas is generated.
Since the material can be stably maintained even for a long period of time, maintenance is not required, and the cost is higher. In addition, since an abnormality in the temperature rise of the internal resistance fuse is detected, an abnormality in the ozone generator can be detected at an early stage, and a scheduled inspection work can be performed. In addition, since the limit of blowing of the resistance fuse can be monitored, the overload operation of the ozone output can be monitored, so that the operation can be controlled with a margin and the emergency ozone can be increased.

[Brief description of the drawings]

FIG. 1 is a front view showing the structure of an ozone generator according to one embodiment of the present invention.

FIG. 2 is a side view showing the structure of the ozone generator.

FIG. 3 is a diagram showing an electric circuit of the ozone generator.

FIG. 4 is a graph showing a transmittance characteristic of a ZnSe material at a wavelength.

FIG. 5 is a configuration diagram of monitoring control of the ozone generator.

FIG. 6 is a partial longitudinal sectional view showing a configuration of a resistance fuse.

FIG. 7 is a diagram illustrating fusing characteristics.

FIG. 8 is an explanatory diagram of a temperature coefficient of resistance.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body tank, 2 ... Opening / closing cover, 3 ... Discharge tube, 4 ... Cylindrical cooling tube, 5 ... Resistance fuse, 5a ... Flange, 5b ...
Insulation case, 5c: resistance fuse wire, 5d: anti-decay agent, 6
... Bushing, 7 ... Power converter board, 7a ... DC current judging device, 7b ... AC voltage judging device, 7c ... Rectifier circuit pulse control unit, 7d ... Inverter pulse control unit, 7e ... Control unit, 8
... Inspection window, 9 ... Infrared sensor section, 9a ... Detection element, 9b ... Amplifier, 9c ... Display tube, 9d ... Determiner, 10
... recorder, 11 ... entrance, 12 ... exit.

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Shigeo Shiono 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Hitachi Kokubu Plant

Claims (6)

[Claims] 1. An ozone generator comprising: a main body tank; an opening / closing cover attached to both ends of the main body tank; and a discharge tube having a main body tank internal resistance fuse,
An ozone generator, wherein at least one of a plurality of inspection viewing windows attached to the ozone generator is formed of a material that transmits an infrared region and a visible region. 2. The ozone generator according to claim 1, wherein a band through which the material transmitting through the infrared region and the visible region passes is a wavelength band of 0.6 to 20 μm. 3. The material for forming the inspection viewing window is ZnS.
The ozone generator according to claim 1 or 2, which is an e or KCl material. 4. An inspection viewing window made of a material that transmits the infrared region and the visible region, or made of ZnSe or KCl material, is attached to an opening / closing cover on an inlet side through which raw material air flows. 3. The ozone generator according to any one of 3. 5. An infrared sensor attached to the atmosphere side of the inspection viewing window of the ozone generator, and a signal from the infrared sensor is input to detect an abnormal temperature rise inside the main body tank and input to the discharge tube. The ozone generator according to any one of claims 1 to 3, further comprising a control unit for controlling electric power. 6. An infrared sensor for detecting an abnormal rise in temperature of a resistance fuse inside a main body tank, wherein a resistance fuse having a large resistance value among a plurality of resistance fuses is arranged at a position of the infrared sensor. 3. The ozone generator according to 3.