JP3581944B2 - Ozone deodorizer - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an apparatus for deodorizing and discharging exhaust gas from various odor generating facilities such as a sewage treatment plant, an incineration plant, and a storage tank.
[0002]
[Prior art]
Conventional deodorizing devices are designed to perform deodorization by installing a creeping discharge type ozonizer in the passage of the air to be treated, and exposing the entire amount of the air having a bad smell to the discharge of the creeping discharge type ozonizer. Effective deodorization can be performed with power consumption.
[0003]
However, in this case, trace components such as hydrogen sulfide and ammonia are converted into reaction products such as acids and salts, for example, sulfuric acid and ammonium sulfate, by plasma chemical reaction in the air to be treated, and the surface near the discharge electrode of the surface discharge type ozonizer is reduced. It was deposited on the outer surface of the protective layer, and as a result, the discharge from the discharge electrode was hindered.
[0004]
Therefore, it is necessary to periodically take out the discharge portion of the surface discharge type ozonizer from the air flow path and clean it with a cleaning liquid.
[0005]
However, if the cleaning is delayed or delayed, the discharge may stop and the deodorizing performance may not be obtained, so that periodic inspection and frequent maintenance are required.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to automatically wash reaction products such as acids and salts deposited on the outer surface of a surface protective layer near a discharge electrode of a surface discharge type ozonizer of the present apparatus, and significantly reduce the frequency of periodic inspection and maintenance. At the same time, it is intended to prevent a decrease in deodorizing performance due to stopping of the discharge of the surface discharge type ozonizer.
[0007]
The ozone deodorizing apparatus of the present invention includes a surface discharge type ozonizer and a cleaning device for removing a reaction product generated by a plasma chemical reaction with a cleaning liquid at a discharge electrode portion on the surface of the surface discharge type ozonizer. In the deodorizing apparatus, the surface discharge type ozonizer is a discharge electrode having a surface covered with a surface protection layer on one surface of a dielectric, a discharge portion having an induction electrode on the back surface thereof, and another end partitioned by an insulating seal. The discharge section is formed with a power supply section composed of a discharge electrode power supply terminal and an induction electrode terminal on the side, the discharge section is inserted and arranged inside the air passage so as to block the gas flow, and the power supply section includes the air flow passage and the air flow passage. A short circuit due to the cleaning liquid is prevented by exposing only the discharge electrodes, which are installed separately from the cleaning part with the cleaning liquid and are covered with the surface protective layer, in the air passage.
[0008]
However, simply performing cleaning may cause a short circuit between the discharge electrode of the creeping discharge type ozonizer and the induction electrode or their connection terminals, and may damage the creeping discharge type ozonizer or cause the discharge to stop. It is necessary to use a creeping discharge type ozonizer having a structure in which only the discharge electrode and the cleaning electrode are exposed to the air flow passage and the induction electrode of the air passage duct wall and the creeping discharge type ozonizer are not short-circuited by washing.
[0009]
As the creeping discharge type ozonizer, the discharge portion of the creeping discharge type ozonizer is separated by a power supply portion and a flange or an insulating seal in the remaining portion, and only the discharge electrode is exposed through the surface protection layer in the discharge portion, and the induction electrode is formed. Is completely buried in the insulating dielectric layer, and a surface discharge type ozonizer having a structure in which the terminal portions of the discharge electrode and the induction electrode are installed outside the flange, that is, separated from the air flow passage and the cleaning portion, is used.
[0010]
Further, in the creeping discharge type ozonizer, in order to eliminate the possibility of short-circuiting between the discharge electrode and a conductive structure such as an air passage duct forming an air flow passage by washing, the discharge electrode is grounded, and the induction electrode is connected to the induction electrode. A creeping discharge type ozonizer having a structure to apply a high voltage is used.
[0011]
In order to minimize the amount of cleaning liquid to be cleaned, a nozzle that jets a jet toward a discharge electrode of a surface discharge type ozonizer is used.
[0012]
The simplest method of treating the waste cleaning liquid that has cleaned the vicinity of the discharge electrode is to temporarily store the waste cleaning liquid in a container disposed under the surface discharge type ozonizer and evaporate the air into the deodorized air by the flow of air itself. If it is difficult to evaporate due to the flow of air itself, an auxiliary heater is used to evaporate the air into the deodorized air.
[0013]
If the amount of the waste cleaning liquid is too large to carry out the evaporation treatment, the liquid is drained from a drain pipe arranged below the creeping discharge type ozonizer in the flow passage, but the odor from the deodorizing device is discharged from the drain pipe. A mechanism for preventing the outflow of air and the inflow of air into the deodorizing device is required, and a solenoid valve is connected to the drain pipe to allow the drain pipe to pass to the outside only at the time of drainage so that the evaporation process can be sufficiently performed. Normally, a structure that shields the outside is used.
[0014]
When washing is performed, the generation of reaction products such as precipitated acids and salts that inhibit discharge is constant, that is, when the amount of odor components to be deodorized and the amount of treated air are constant, control using a timer is performed. decide.
[0015]
When the odor components to be deodorized and the amount of processing air fluctuate, the timer control that performs cleaning in a fixed time is often insufficient.In this case, the discharge intensity of the surface discharge type ozonizer is detected by the ozonizer power supply. Then, control is performed so that cleaning is performed when the discharge intensity decreases.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
A surface discharge type ozonizer for deodorization is disposed in an air flow path of the odor air flowing by a blower or a fan, and the odor in the air flowing there is removed by the ozone generated from the ozonizer to deodorize.
[0017]
When the discharge is continuously performed and reaction products such as sulfuric acid and ammonium sulfate accumulate on the outer surface of the surface protective layer formed on the surface of the discharge electrode of the ozonizer, the discharge action is reduced and the deodorization action is reduced. I do.
[0018]
At that time, the cleaning liquid is sprayed from the cleaning device toward the reaction product accumulated on the outer surface of the surface protection layer near the discharge electrode to clean it, and the discharge action from the discharge electrode is activated again, thereby the function of the ozonizer. To recover.
[0019]
【Example】
An embodiment of the present invention will be described with reference to the accompanying drawings. A cleaning device 6 using a cleaning liquid is directed to a deodorizing surface discharge type ozonizer 4 provided in an air flow passage 2 for a malodorous air 1 flowing by a blower or a fan (not shown). The cleaning liquid nozzle 7 is installed, and the cleaning device 6 is operated as appropriate, and the cleaning liquid jet 12 is jetted to the surface protection layer 23 near the discharge electrode of the deodorizing creeping discharge type ozonizer 4, and sulfuric acid, ammonium sulfate, etc. adhering thereto are sprayed. The reaction product 23a is removed.
[0020]
In the deodorizing surface discharge type ozonizer 4 used at this time, only the discharge portion 4a is exposed to the cleaning portion 2a of the air passage 2 through the flange 5, and the discharge electrode terminal 15 and the induction electrode terminal 16 of the power supply portion 4b are connected to the air passage duct 3. And the induction electrode 25 is disposed within the thickness of the dielectric 28 of the deodorizing surface discharge type ozonizer 4, and the dielectric 28 is interposed between the induction electrode 25 and the air passage duct 3. Even if the surface protective layer 23 of the deodorizing creeping discharge type ozonizer 4 gets wet due to the cleaning, the discharge electrode 26 is connected to the other induction electrode 25 of the deodorizing creeping discharge type ozonizer 4, the air passage duct 3 and the air passage duct 3 via the flange. Is not short-circuited with the discharge electrode terminal 15 and the induction electrode terminal 16 provided outside .
[0021]
Further, the flange 5 to be attached to the deodorizing creeping discharge type ozonizer 4 may be formed of ceramic or glass, and after it is manufactured, the flange 5 may be integrally formed with the deodorizing creeping discharge type ozonizer 4, or may be formed with an O-ring or packing (shown in the drawing). ) May be fixed to the surface discharge type ozonizer 4 for deodorization.
[0022]
The discharge electrode 26 of the deodorizing creeping discharge type ozonizer 4 is formed of a surface protective layer 23 made of high-purity alumina or the like, thereby protecting the reaction product 23a and washing water from adhering and ion bombardment due to discharge. Prevent wear.
[0023]
The discharge electrode 26 and the induction electrode 25 are connected to the ozonizer power supply 17 via the discharge electrode terminal 15 and the induction electrode terminal 16, respectively. The discharge electrode 26 is connected to the ground side, and the induction electrode 25 is connected to the high voltage side. Thus, it is possible to prevent the discharge electrode 26 and other components such as the air passage duct 3 from being short-circuited due to cleaning.
[0024]
The cleaning liquid nozzle 7 of the cleaning apparatus 6 is capable of forming a jet stream in order to obtain a high cleaning performance with a small amount of cleaning liquid used for cleaning.
[0025]
The cleaning liquid that has washed the deodorizing creeping discharge type ozonizer 4 falls as cleaning water falling droplets 13, and is collected in a waste cleaning liquid container 9 installed below the deodorizing creeping discharge type ozonizer 4.
[0026]
Although the cleaning liquid 14 after cleaning stored in the waste cleaning liquid container 9 is naturally evaporated by the flow of air, the heater 10 may be used in order to accelerate the evaporation.
[0027]
When the amount of the waste cleaning liquid 14 is large, a drain pipe 11 with an electromagnetic valve 11a can be provided in the waste cleaning liquid container 9 and drained to the outside. It is necessary to control the opening and closing of the solenoid valve 11a so that the air does not flow into the air passage 2 or the odor-treated air leaks out.
[0028]
The control of the cleaning such as the cleaning interval and the cleaning time can be most easily performed by using a timer in the operation control device 18. However, in order to perform the cleaning more effectively, the ozonizer power supply 17 has a function of detecting the discharge intensity. It is also possible to perform control such that cleaning is automatically performed by the cleaning controller 8 when the discharge intensity falls below the setting.
[0029]
When performing control for automatically performing cleaning, for example, when a timer is used for the operation control device 18, the cleaning liquid discharge device 8 (with an electromagnetic valve) of the cleaning device 6 is transmitted from the operation control device 18 after a preset time. The cleaning instruction signal 19 is given to a water pipe or a pump for cleaning.
[0030]
At the same time, the discharge command signal 21 may be given to the ozonizer power supply 17 to stop the operation during cleaning and restart the operation after the cleaning is completed.
[0031]
When a large amount of cleaning liquid is used, an electromagnetic valve opening / closing signal 22 is given to the electromagnetic valve 11a, and the opening and closing of the electromagnetic valve 11a is controlled so that the cleaning liquid 14 is discharged to the outside immediately after cleaning.
[0032]
When the operation control device 18 receives the discharge intensity signal 20 from the ozonizer power supply 17 and the discharge intensity becomes equal to or less than a predetermined value, the operation control device 18 sends the cleaning liquid discharge device 8 of the cleaning device 6 (a water pipe with a solenoid valve or a pump). ) Can be controlled by giving a cleaning command signal 19 to the cleaning.
[0033]
Also in this case, similarly, the discharge command signal 21 is given to the ozonizer power supply 17 to stop the operation during the washing, and the operation is restarted after the washing is completed, or the solenoid valve opening / closing signal 22 is given to the solenoid valve 11a to quickly start the washing after the washing. The opening and closing of the solenoid valve 11a may be controlled so that the cleaning liquid 14 is discharged to the outside.
[0034]
【The invention's effect】
Since the present invention is configured as described above, the reaction products of acids and salts such as sulfuric acid and ammonium sulfate deposited on the outer surface of the surface protective layer near the discharge electrode of the surface discharge type ozonizer are automatically washed, and this portion is periodically cleaned. It is possible to greatly reduce the frequency of inspection and maintenance, and at the same time, prevent the creeping discharge type ozonizer from deteriorating its deodorizing ability due to stopping the discharge.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.
FIG. 2 is an enlarged perspective view of a part of FIG. 1 and a cross-sectional view in which a main part thereof is further enlarged.
[Explanation of symbols]
2 Air flow passage 3 Air passage duct 4 Surface discharge type ozonizer for deodorization 5 Flange 6 Cleaning device 7 Cleaning liquid nozzle 10 Heater 11 Liquid distribution pipe with solenoid valve 12 Cleaning liquid jet 13 Cleaning liquid drop 14 Waste cleaning liquid 23 Surface protection layer 23a Reaction generation Object 25 Induction electrode 26 Discharge electrode 28 Dielectric

Claims (7)

In a deodorizing apparatus provided with a surface discharge type ozonizer and a cleaning device for removing a reaction product generated by a plasma chemical reaction at a discharge electrode portion on the surface of the surface discharge type ozonizer with a cleaning liquid,
A discharge electrode in which the surface discharge type ozonizer is covered with a surface protection layer on one surface of a dielectric, a discharge portion having an induction electrode on the back surface thereof, and a discharge electrode terminal on the other end separated by an insulating seal. The power supply unit is formed of an induction electrode terminal, and the discharge unit is inserted and disposed in the air flow passage and the liquid cleaning unit, and the power supply unit is installed separately from the air flow passage and the cleaning unit using the cleaning liquid. A deodorizing apparatus using ozone, wherein only a discharge electrode covered with the surface protective layer is exposed to an air passage to prevent a short circuit caused by a cleaning liquid. Only the discharge electrode in the discharge part of the surface discharge type ozonizer is exposed in the air flow duct, and the short circuit between the discharge electrode and the air passage duct and between the discharge electrode and the induction electrode of the surface discharge type ozonizer is caused by washing with the cleaning liquid. 2. An ozone deodorizing apparatus according to claim 1, wherein a dielectric is interposed between them to prevent the deodorization. In the creeping discharge type ozonizer, which consists of a power supply part on one end and a discharge part on the other end separated by a flange, the power supply part on one end is arranged outside the air flow passage duct, and the discharge part on the other end is It is inserted inside the passage duct, and only the discharge electrode in the discharge part is exposed to the air flow passage through the surface protection layer, and the induction electrode in the discharge part is formed of the dielectric material constituting the surface discharge type ozonizer. The ozone deodorizing device according to claim 1, wherein the device is buried inside. 2. The deodorizing apparatus according to claim 1, wherein a discharge electrode in a discharge portion of the surface discharge type ozonizer is used as a ground electrode, and an induction electrode in the discharge portion is used as a high voltage application electrode. The ozone deodorizing apparatus according to claim 1, wherein the cleaning apparatus includes a cleaning liquid nozzle that jets a cleaning liquid jet toward a discharge electrode of the surface discharge type ozonizer. When draining the waste cleaning liquid used for cleaning from the drain pipe arranged below the surface discharge type ozonizer in the air flow passage, it normally passes through a solenoid valve that prevents the inflow and outflow of air from the drain pipe. The ozone deodorizing apparatus according to claim 1, wherein The creeping discharge type ozonizer is connected to an ozonizer power supply having a discharge power detection function, the creeping discharge type ozonizer detects the creeping discharge intensity of the creeping discharge type ozonizer, and automatically performs cleaning with the cleaning liquid when the creeping discharge power decreases. The ozone deodorizing apparatus according to claim 1, wherein the deodorizing is performed.

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