JPS58133830A - Removing method of ozone and its device - Google Patents

Abstract

PURPOSE:To remove ozone safely and surely by consuming a small amount of energy, by irradiating a ray of light limited in a range of specific wave length to a gaseous body containing ozone. CONSTITUTION:When a ray of light of 220-290nm (especially 240-275nm) is irradiated to a gaseous body containing ozone, the ozone is perfectly removed in an extent of 4min. As a light source, a low-voltage mercury-arc lamp, which has a wave length of 253.7nm as a main component and does not irradiate a ray of light of <=200nm wave length, is used.

Description

DETAILED DESCRIPTION OF THE INVENTION Ozone is generated by electric discharge in the air or by irradiation of the air with ultraviolet rays, X-rays, etc. Because ozone has a strong oxidizing effect, it is used for disinfection, sterilization, and oxidation reactions, but it is also highly toxic, and if inhaled for more than 30 minutes at 50 ppm, there is a risk of death (0.02 to 5 ppm). (0.1 ppm is said to be the maximum allowable concentration for 8 hours).

It is an object of the present invention to provide a method and apparatus for eliminating ozone safely and reliably with a small amount of energy.

Conventionally, methods for eliminating ozone include (1) thermal decomposition method (1)
Methods such as the 2+ catalyst method (contact with a solid at 50 to 200°C or higher) and the 2+ catalyst method (activated carbon, silver-nickel catalyst) are known. Gases must be heated in the same way, consuming a large amount of thermal energy, and in the catalytic method, the catalyst may be exhausted (activated carbon) or other gases that may coexist with ozone may be used. For example, it has drawbacks such as being deactivated by water, carbon dioxide, and nitrogen oxides, and requiring regeneration treatment (Silver-!S!!-Tsukeru).

The present invention has been devised to improve the above-mentioned drawbacks, and provides a method and apparatus for eliminating ozone in a simple and economical manner, and if necessary, by placing the ozone in the same space as the ozone generation source. provide. Present invention 14, gas containing ozone 22
This is based on the new prefecture that ozone is decomposed by irradiating light with a specific wavelength of 0 to 29 Qnm, especially 240 to 275 nm.

As the light source used in the present invention, any light source can be used as long as it does not include light with a wavelength of 200 nm or more, but emits light with a wavelength of 220 to 290 nm, preferably 240 to 2751 m. Low-pressure mercury lamps, especially those with a wavelength of 253.7 nm as their main component, and
A material that does not emit a wavelength of QQ'nm or less is used.The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to the Examples.

Example 1 In a photosensitive resin curing device using a high-pressure mercury lamp (SKW) as a light source, ozone contained in the air used for cooling the high-pressure mercury lamp was removed using a low-pressure mercury lamp that emits light with a wavelength of 253.7 nm. , a flow velocity of 10 m/m in a duct lined with four 40 W lamps that do not contain components of 200 nm or less.
Passed it in minutes. Ozone-concentrated IW is 15 pp untreated.
m to 0.01 ppm.

Example 2 A low-pressure mercury lamp (referred to as lamp A) that has a wavelength of 253.7 nm as its main component and does not emit light of 200 nm or less
Two W lights and a low-pressure mercury lamp (for example,
The intensity ratio of 253.7 nm and 184.9 nm is 10
A low-pressure mercury lamp with a ratio of 0:3 (referred to as lamp B) is 2
In a closed type sterilization device incorporating two 0W lamps, sterilization is carried out for 2 minutes by simultaneously lighting lamps Ai- and B (at this time, the ozone concentration in the device is several 10
Then, when only lamp A was turned on for 4 minutes and the door was opened, no ozone odor was detected (ozone concentration was 0.02 ppm or less).

Nafu... Because this device does not use any heat sources such as nichrome wire heaters for ozone elimination, the lamp life is approximately 3.
It has the advantage of being long (more than 1,000 hours) and causing little rise in surface temperature of the object to be disinfected.

patent applicant

Claims (2)

[Claims] (1) 220 to 290 nml of gas containing ozone
:'M, preferably ν of light with a wavelength of 240 to 275 nm
A method for erasing ozone, which is characterized by: (2) An ozone elimination device that uses the method described in claim 1 as an ozone elimination method.