JP3240291B2 - Weathering light test equipment with exhaust treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a test apparatus for testing weather resistance or light resistance of industrial materials, particularly dust, nitrogen monoxide (NO) or nitrogen dioxide (NO) in exhaust gas discharged from the test apparatus.
₂ ) The present invention relates to a test apparatus provided with an exhaust treatment device capable of detoxifying the substance in ₂ ) and releasing it into the atmosphere.

[0002]

2. Description of the Related Art A weathering test apparatus is used to artificially reproduce, in a short time, the aging deterioration of various industrial materials in a natural environment, and to examine the weathering resistance. Therefore, an artificial light source is used instead of sunlight while controlling the temperature and humidity or rainfall in the test apparatus. About this artificial light source, JI
SB 7751, JIS B 7753, JIS B
For example, the voltage and current ratings are determined for each type of light source so that light having a predetermined spectral distribution is always obtained. For example, JIS B 7753 (sunshine carbon arc lamp type weather resistance tester) holds four pairs of carbon electrodes as shown in FIG. 3 in the upper and lower directions, surrounds the periphery thereof with eight glass filters, and applies 50 ± 1V, 60 ±
It discharges at an arc voltage and current of 2A.

[0003] This carbon electrode burns with discharge,
In order to wear out, a new carbon pair is attached every 24 hours, 60 hours or 78 hours, and the test is performed by lighting continuously. Naturally, the arc generates hot air, combustion gas, and ash, so that an exhaust treatment device for discharging the hot air, combustion gas, and ash is required.

Conventionally, in the above-mentioned regulations, an exhaust port is provided above a light-emitting portion, and a suitable device such as an exhaust duct is connected to the exhaust port, so that a structure capable of discharging hot air, generated gas and the like is provided, and the exhaust gas is directly discharged outdoors. And it was. Therefore, an exhaust duct was attached to the light emitting part exhaust port or the test tank exhaust port as shown in FIG. This was not desirable when considering environmental issues.

Incidentally, in the Air Pollution Control Law, regarding the environmental standards concerning nitrogen oxides (NOx), which is one of the causative substances of air pollution, especially in the case of Tokyo, the average daily amount is 0. It is set to 06 ppm or less. In the apparatus based on JIS B 7753, the emission amount of nitrogen oxides at the light emitting part exhaust port exceeds the reference value of 0.06 ppm, and the harmless treatment of at least nitrogen oxides in exhaust gas from the apparatus is performed. Was needed.

[0006] As a technique for controlling such nitrogen oxides (NOx), for example, there is a combustion improvement method of changing the air ratio during the combustion operation of a boiler to suppress and control the generation of nitrogen oxides (NOx). However, in the light-emitting part of the weathering light test device, it is necessary to burn carbon by a rating in order to always obtain light having a predetermined spectral distribution. Therefore, it was necessary to remove nitrogen oxides (NOx) from the exhaust gas.

That is, this exhaust gas has an exhaust amount of about 2.4 m ³ / min containing hot air, ash, and gas from the above-mentioned light emitting portion exhaust port. After detoxifying this exhaust gas, it can be discharged to the atmosphere. It has been desired to develop a weathering test device that does not become a source of air pollution.

[0008]

Conventionally, as a technique for removing nitrogen oxides (NOx) from exhaust gas, ammonia or the like is used as a reducing agent, and a catalyst is used to remove nitrogen oxides (NOx).
Although x) is reduced to nitrogen and water, there is a problem that it is not suitable for practical use as an exhaust treatment of a weathering test device such as an increase in equipment cost.

On the other hand, as a weather resistance test method, there are a continuous method of continuously lighting and exposing, and a light and dark method of repeating irradiation and dark, that is, lighting and extinguishing. The former is a generally performed method, and requires a process from a light emitting unit as an exhaust process including nitrogen oxides.

As an example of the latter, JIS Z 9105
(Reflective safety signboard). This is a method of repeating a lighting-off cycle for 60 minutes to 60 minutes as a due cycle type accelerated weather resistance test method. Therefore,
The time required to process the exhaust gas from the light emitting unit and the time not required are repeated, and the exhaust process needs to be performed without waste.

Further, according to the above-mentioned JIS Z 9105, the structure is such that the glass filter (40) of the light emitting section (40) is not used, so that the exhaust from the light emitting section with the glass filter removed is tested. There was a problem that it diffused into the tank and was discharged from the test tank exhaust port. That is, in the test tank, ozone, water vapor, hydrocarbons, etc. in the air receive ultraviolet rays from the artificial light source and react with each other to generate free radicals (free radicals) having strong oxidizing power,
There has been a problem that nitric acid is produced from nitrogen oxides and discharged together with ozone.

[0012] Therefore, an efficient processing apparatus corresponding to a test method of repeating lighting and extinguishing, and an exhaust containing nitrogen oxides discharged from both the light emitting part and the test tank can be treated, and particularly harmful to the human body. There has been a demand for a weather resistance test apparatus provided with an exhaust treatment device capable of detoxifying nitrogen monoxide or nitrogen dioxide.

[0013]

According to the present invention, in order to solve the above-mentioned problems, an exhaust treatment device for supplying exhaust gas from the weathering test device according to claim 1 is provided with a dust removing device including an air filter for removing dust. A tank, an oxidation reaction tank containing an ultraviolet lamp, a gas adsorption tank containing a nitrogen dioxide (NO ₂ ) adsorbent,
The oxidation reaction tank including the ultraviolet lamp is composed of a suction tank connected to an exhaust fan, and the oxidation reaction tank including the ultraviolet lamp is configured to ozone ambient air with ultraviolet light, and an ozone introduction pipe for ozonizing low-humidity air from an electronic cooling dehumidifier. An ozone oxidation reaction tank that converts all of the nitric oxide (NO) in the exhaust gas to nitrogen dioxide (NO ₂ ) with a silent discharge ozone generator that communicates through
A weathering light test device equipped with an exhaust treatment device characterized in that the entire amount of the nitrogen dioxide (NO ₂ ) is adsorbed and captured in a gas adsorption tank and released harmlessly into the atmosphere.

Further, the electronic cooling dehumidifier according to claim 2 comprises an electronic cooling element, a dehumidifying fin, and a radiator, and converts the air from the air compressor into stable low-humidity air to produce a silent discharge ozone generator. A weathering light test device equipped with the exhaust treatment device according to claim 1, wherein continuous air supply is possible.

[0015] Thus, the dust contained in the exhaust gas generated from weathering optical test apparatus using an artificial light source, it is the removal of nitrogen monoxide (NO) and nitrogen dioxide (NO _2), in particular the nitrogen dioxide (NO ₂ The entire amount of (2) was adsorbed and captured in the gas adsorption tank, and the exhaust gas could be released harmlessly into the atmosphere.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of an exhaust treatment device showing the configuration of the present invention. The exhaust treatment device (1) is composed of a dust removal tank (2), an oxidation reaction tank (3), a gas adsorption tank (4), and a suction tank (5), and each tank is independent as shown in FIG. And at the fitting joint (60) can be integrated by mating and overlapping,
The structure is easy to maintain.

Then, the exhaust gas from the weathering test device (50) passes through the exhaust duct (34) and enters the dust removing tank (2) from the exhaust inlet (10), where dust or ash in the exhaust gas is removed. Then, it enters the oxidation reaction tank (3). An ultraviolet lamp (12) is provided in the oxidation reaction tank (3), and an ozone oxidation as shown by a dashed line in FIG. 1 is performed by a silent electric discharge ozone generator (6) and an electronic cooling dehumidifier (7). A reaction tank (9) is formed.

An ultraviolet lamp disposed inside the oxidation reaction tank (3) forming the ozone oxidation reaction tank generates ultraviolet rays, and the reaction (chemical formula 1) for converting oxygen to ozone by the ultraviolet rays and the monoxide. Reaction to convert nitrogen to nitrogen dioxide
And work to convert nitrogen monoxide in the exhaust gas to nitrogen dioxide. Further, a large amount of ozone is introduced into the oxidation reaction tank (3) from a silent discharge ozone generator (6) which communicates via an ozone introduction tube, and the nitric oxide and ozone react with the action of the ultraviolet rays. Then, by the reaction (Chem. 3) for converting into nitrogen dioxide and oxygen, all the nitrogen monoxide (NO) in the exhaust gas is converted into nitrogen dioxide (NO ₂ ).

[0019]

Embedded image O ₂ + hν → O ₃

[0020]

Embedded image NO + hν → NO ₂

[0021]

[Formula 3] _{NO + O 3 → NO 2 +} O 2

The silent discharge ozone generator (6) comprises an electrode plate (20) and a radiator (21), and receives stable low-humidity air from the electronic cooling dehumidifier (7). The low-humidity air passing over the electrode plate (20) is ozonized and sent to the oxidation reaction tank (3). Incidentally, the electrode plate (20) has a 1-1.5 mm thick dielectric glass plate with a flat comb-shaped electrode attached to the upper surface, an electrode attached to the entire lower surface, and a 5 mm gap between both electrodes. A silent discharge is applied by applying a voltage of 10 to 10 KV, and the low-humidity air passing over the electrode plate (20) is ozonized to produce 3000 to 4000 ppm of ozone gas.

The electronic cooling dehumidifier (7) comprises an electronic cooling element (23) and a radiating fin (24). The compressed air from the air compressor (8) is introduced to the radiating fin (24). ) To make the air stable and low in humidity, so that it can be continuously supplied to the silent discharge ozone generator. Therefore, when a conventional drying cylinder filled with a silica gel adsorbent is used, the disadvantage that fluctuations in the dehumidification capacity cause instability of the ozone generation amount in the silent discharge ozone generator is solved.

The exhaust gas changed from NO to NO ₂ by the ozone oxidation reaction tank (9) formed as described above enters the next gas adsorption tank (4), and the upper holding filter (1).
NO ₂ filled between 3) and the lower holding filter
The whole amount is adsorbed and captured by the adsorbent (15) to become clean air, and then is sucked into the suction tank (5) connected to the exhaust fan (16) and discharged harmlessly from the exhaust port (17). .

Unreacted ozone in the oxidation reaction tank also enters the gas adsorption tank (4), is detoxified by the catalytic action of the NO ₂ adsorbent (15), and is discharged through the suction tank. . In this embodiment, activated carbon having a physical adsorption action is used as the NO ₂ adsorbent, but an adsorbent mainly containing calcium hydroxide as a base material can be used.

[0026]

EXAMPLES Table 1 shows examples according to the present invention. That is,
The figure shows the result of measuring the concentration of nitrogen oxides in the exhaust gas discharged from the light emitting part of the weathering light test device into the exhaust gas treatment device and discharged to the exhaust port (17) through each tank. The concentration was 0.001 ppm or less, which was an effect of sufficiently satisfying the standard of Tokyo of 0.06 ppm or less.

[0027]

[Table 1]

Further, of the above test methods, 60 minutes-60
In the case of the light / dark method in which lighting is turned on and off repeatedly, the solenoid valve (18) is actuated by a signal from a control device (not shown) when the light is turned off, and the flow of a large amount of ozone from the silent discharge ozone generator into the oxidation reaction tank is stopped. Then, only the action of the ultraviolet light from the ultraviolet lamp in the oxidation reaction tank can convert NO in exhaust gas from the exhaust port of the test tank into NO ₂ and send it to the gas adsorption tank. When the lamp is turned on, the electromagnetic valve (18) is operated. Then, the flow of a large amount of ozone into the oxidation reaction tank is resumed, the exhaust gas is exhausted from the light emitting unit exhaust port, and diffused into the test tank (30) by not using the glass filter of the light emitting unit. 33), the total amount of the exhaust gas discharged from the exhaust port of the test tank and the large amount of ozone from the silent discharge ozone generator is converted into NO by the action of the ultraviolet lamp in the oxidation reaction tank and the large amount of ozone from the silent discharge ozone generator. Change to ₂ ,
The fact that the gas was fed into the gas adsorption tank enabled efficient operation of the ozone oxidation reaction tank without waste.

[0029]

As described above, in the treatment of the exhaust gas generated and exhausted from the weathering test apparatus, the exhaust gas is particularly harmful to the human body in the exhaust gas and has a great effect on the environment. Nitrogen oxide and nitrogen dioxide are rendered harmless and released to the atmosphere, and the emission standard value of nitrogen oxides regulated by the Air Pollution Control Law is 0.06.
The remarkable effect of detoxification was obtained at a concentration of 0.001 ppm or less which sufficiently satisfies the ppm or less.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of the present invention.

FIG. 2 is a diagram showing the exhaust of the weathering light test device.

FIG. 3 is a diagram showing a light emitting unit of the weathering test device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Exhaust treatment apparatus 2 Dedusting tank 3 Oxidation reaction tank 4 Gas adsorption tank 5 Suction tank 6 Silent discharge ozone generator 7 Electronic cooling dehumidifier 8 Air compressor 9 Ozone oxidation reaction tank 10 Exhaust inlet 12 Ultraviolet lamp 11 Air filter 13 Upper filter 14 Shitaosae filter 15 NO ₂ absorbent 16 exhauster 17 outlet 18 solenoid valve 19 ozone introduction pipe 20 electrode plates 21 and 22 radiator 23 cooler 24 radiating fins 25 auto drain 30 test chamber 31 emitting portion outlet 32 test Vent outlet 33 Air regulating valve 34 Exhaust duct 40 Light emitting part 41 Glass filter 42 Carbon electrode 50 Weathering test device 60 Fitting joint

Claims (2)

(57) [Claims] 1. A weathering test apparatus having an artificial light source, comprising: an exhaust treatment device for removing dust, nitrogen monoxide (NO) and nitrogen dioxide (NO ₂ ) contained in exhaust gas generated from the test device, and harmlessly releasing the exhaust gas. A weathering light test device, wherein the exhaust treatment device (1) includes a dust removal tank (2) provided with an air filter for removing dust, an oxidation reaction tank (3) provided with an ultraviolet lamp, The oxidation reaction tank, comprising a gas adsorption tank (4) provided with a nitrogen dioxide (NO ₂ ) adsorbent and a suction tank (5) connected to an exhaust fan, is provided with an ultraviolet lamp. An ultraviolet lamp (12) for ozonizing air and a silent discharge ozone generator (6) communicating with an ozone introduction pipe for ozonizing low-humidity air from an electronically cooled dehumidifier (7) are used to reduce the amount of exhaust gas. Nitric oxide (NO)
To form an ozone oxidation reaction tank (9) that converts all of the nitrogen dioxide into nitrogen dioxide (NO ₂ ), and the entire amount of the nitrogen dioxide (NO ₂ ) is adsorbed and captured in the gas adsorption tank (4) and released harmlessly into the atmosphere. A weathering light test device provided with an exhaust treatment device characterized by the above-mentioned. 2. The electronic cooling dehumidifier (7) includes an electronic cooling element (23), a dehumidifying fin (24), and a radiator (2).
2. The exhaust gas treatment apparatus according to claim 1, wherein air from the air compressor (8) is changed to stable low-humidity air to enable continuous air supply to the silent discharge ozone generator. Equipped with weather light test equipment.