JPS5919521A - Deodorizing apparatus - Google Patents

Abstract

PURPOSE:To inexpensively remove and deodorize a malodorous substance in an exhaust gas without generating public nuisance, by irradiating an exhaust passage with ultraviolet rays through an ultraviolet ray pervious partition wall to polymerize and solidify a photopolymerizable malodorous substance. CONSTITUTION:Ultraviolet ray lamps 2 are arranged to both sides of an exhaust duct 1 and ultraviolet ray irradiating windows 3 comprising a transparent fluorine contained resin film are attached to the opening parts 1C of the duct 1 as partition walls to be fixed by frames 4 so as to keep airtightness. An exhaust gas containing a photopolymerizable malodorous gas such as styrene generated in an FRP molding working facility is sucked in the exhaust duct. The malodorous substance is subjected to polymerization reaction by ultraviolet rays B irradiated through the ultraviolet ray irradiating windows 3 to be converted to a solid polymer which is, in turn, adhered to a filter or the inner wall of the exhaust duct 1 to be removed while the deodorized exhaust gas is exhausted to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel deodorizing device for exhaust gas containing malodorous substances. More specifically, the present invention relates to a deodorizing device for exhaust gas containing malodorous substances (such as styrene monomer) discharged from, for example, an FRP molding factory.

Traditionally used exhaust gas deodorization devices include:
An absorption layer filled with an adsorbent material (such as activated carbon) is provided to block the exhaust passage, and when exhaust gas containing malodorous substances such as styrene monomer passes through the absorption layer, the physical A so-called activated carbon adsorption type deodorizing device that adsorbs and removes malodorous substances by adsorption action, and a heating combustion furnace installed at the end of the exhaust passage,
There are so-called direct combustion deodorizers that deodorize exhaust gas containing malodorous substances by heating and burning it directly with fuel at a high temperature, or a part of the exhaust passage that is heated at a relatively low temperature (
About 200~! A so-called catalytic combustion type deodorizing device is used, in which a packed bed of a catalyst (for example, platinum, etc.) is provided to deodorize malodorous substances by heating and burning them.

However, since the activated carbon adsorption method utilizes the physical adsorption effect of activated carbon, there is a limit to the amount of malodorous substances that can be adsorbed. Therefore, if the concentration of malodorous substances is high, a large amount of activated carbon is required, making it expensive, and in some cases, the exhaust gas containing malodorous substances may not be absorbed sufficiently and may be discharged to the outside. . Furthermore, activated carbon has short service life and high running costs.

In addition, the two combustion types require a large amount of fuel for heating, and the catalytic combustion type in particular requires an expensive catalyst such as platinum or palladium. Furthermore, if the exhaust gas contains substances that act as catalyst poisons, the useful life of the catalyst will be extremely shortened, and the catalyst will need to be frequently replaced with a new one, resulting in higher running costs.

Therefore, the inventors of the present invention have conducted extensive research in order to provide a deodorizing device that eliminates the drawbacks in terms of price and has low running costs, and as a result, they have completed the present invention.

That is, the present invention provides an exhaust passage, at least one ultraviolet irradiation light source arranged to irradiate a part of the exhaust passage, and an ultraviolet light transmitting light source arranged between the exhaust passage and the ultraviolet irradiation light source. The present invention relates to a deodorizing device having a sexual separation wall.

Since the deodorizing device of the present invention is constructed to be superior in value,
Photopolymerizable malodorous substances (such as styrene monomers and acrylic monomers) can be polymerized and solidified using energy, eliminating malodors from exhaust gas without using expensive consumables such as activated carbon, fuel, or catalysts. Substances can be removed and deodorized.

Next, the deodorizing device of the present invention will be explained with reference to the drawings. The drawing is a sectional view showing an embodiment of the deodorizing device of the present invention. In the following description of the embodiment, a case will be explained in which a transparent fluororesin film is used as a representative example of the ultraviolet-transparent isolation wall. ) (1b) together constitute an exhaust duct (1). There are exhaust ducts (1) on both sides of the exhaust duct (1).
) A plurality of ultraviolet irradiation lamps (2) are arranged as ultraviolet irradiation light sources so as to irradiate the exhaust passage inside the exhaust duct (1) from the opening (1C) provided in the side wall of the exhaust duct (1). An ultraviolet irradiation window (3) made of a transparent fluororesin film is fixed as a separation wall to the opening (1C) with a mounting frame (4) so as to maintain airtightness. There is a coarse mesh filter (1b) inside the discharge side exhaust duct (1b).
6) is arranged so as to block the exhaust passage. Note that a non-adhesive layer (5) made of fluororesin is provided on the inner wall of the exhaust duct (1).

Next, the operation of the deodorizing device constructed as described above will be explained.

Exhaust gas containing photopolymerizable malodorous substances (such as styrene monomer) generated in an FRP molding workshop etc. is sucked in by an exhaust pump (not shown) and flows inside the exhaust duct (1) as indicated by the arrow (A). direction.

When the exhaust gas reaches the ultraviolet irradiation window (3), the malodorous substances in the exhaust gas undergo a self-polymerization reaction, for example, due to the ultraviolet rays (indicated by arrow (B)) irradiated through the transparent fluororesin film. It forms into a polymer (eg, styrene polymer) and becomes a solid. The solid polymer is removed from the exhaust gas by adhering to the surface of the filter (6) provided in the exhaust passage and the inner wall of the surrounding exhaust duct (1). In this way, the malodorous substances are removed and the deodorized exhaust gas is discharged to the outside.

The flow rate and flow velocity of exhaust gas in the deodorizing device of the present invention, the length of the ultraviolet irradiation window (3) 2) or the ultraviolet irradiation lamp (2)
It is preferable that the intensity and wavelength of the odor can be adjusted as appropriate depending on the concentration and composition of malodorous substances in the exhaust gas, thereby further enhancing the deodorizing effect. Furthermore, the adjustment may be performed automatically using a suitable detection device.

Further, in the deodorizing device of the present invention, it is preferable that a non-adhesive layer (5) is formed by coating the part to which the polymerized solidified product adheres, such as the inner wall of the exhaust duct, with, for example, a fluororesin-based organic substance. The work of removing the polymer solidified product can be facilitated.

A transparent fluororesin film or sheet is preferably used as the material for the ultraviolet irradiation window (3), but any material that is transparent to ultraviolet rays, such as inorganic glass that is highly transparent to ultraviolet rays, may be used. Vine. In the latter case, it is preferable to form a transparent fluororesin-based non-adhesive layer on at least the side of the inorganic glass that comes into contact with the exhaust gas, thereby making it easier to remove the adhered polymerized solidified material.

Examples of the material for the transparent fluororesin film or sheet used for the ultraviolet irradiation window (3) include tetrafluoroethylene-hexafluoropropylene (FDP) resin, polychlorotrifluoroethylene (poTFx) resin, and ethylene-tetrafluoroethylene (poTFx) resin. Fluoroethylene (xTrx)! Vinylidene resins such as fluorine-containing resins are preferably used, but FEP resins are also preferable in terms of ultraviolet transmittance.

Transparent fluororesin films or sheets such as those above have excellent transmittance to ultraviolet rays, especially ultraviolet rays in the near ultraviolet region, which is the most efficient ultraviolet wavelength region (600 to 4 oonm) for photopolymerization reactions. This material is particularly preferable as the material for the ultraviolet irradiation window (3) in the present invention because it can efficiently irradiate exhaust gas with ultraviolet rays without absorbing ultraviolet energy.

In addition, fluororesin films or sheets have excellent UV resistance and excellent chemical stability, so even when using a deodorizing device for a long time, the material can withstand long-term exposure to UV rays. It has excellent advantages such as there is less risk of it becoming unusable due to deterioration, and there is also less risk of the material becoming unusable due to swelling or dissolution due to malodorous substances contained in exhaust gas.

In addition, fluororesin films or sheets have excellent non-adhesive properties, so even if self-polymerized polymers adhere to the surface due to ultraviolet irradiation, they will not stick and can be easily removed. It also has the advantage of

In the deodorizing device of the present invention, the mounting frame (4) is connected to the exhaust duct (1).
) is preferably configured so that it can be easily removed from the UV irradiation window (3), thereby preventing the polymer from adhering to the inner surface of the UV irradiation window (3) during long-term operation, reducing or inhibiting the UV transmittance. Even if the deodorizing effect decreases due to the deodorizing effect, the deodorizing effect can be easily and inexpensively restored by removing the deposits or replacing the ultraviolet irradiation window (3), which further reduces running costs. Can be done.

The ultraviolet wavelength range of the ultraviolet light generation source in the deodorizing device of the present invention is preferably set to a wavelength range that can efficiently remove any malodorous substance to be deodorized. For example, the maximum ultraviolet absorption wavelength of photopolymerizable organic substances containing at least one double bond as a chemical structure (e.g. styrene monomer, acrylic monomer, etc.) is 300 to 400 nm, that is, in the near ultraviolet region. When the target is a substance, a light source that mainly emits ultraviolet light in the near ultraviolet region is preferable. In addition, when using a light source such as a high-pressure mercury lamp that mainly generates ultraviolet rays with higher energy than the above-mentioned range, that is, with a shorter wavelength (500 nm or less), the strong oxidizing effect of the ozone generated thereby oxidizes and decomposes malodorous substances. While this can increase the deodorizing effect, the ozone generated is harmful to the human body and may cause secondary pollution.Furthermore, the light source generates a large amount of heat, so it must be cooled. . In order to eliminate such adverse effects, it is preferable to employ a light source in the near ultraviolet region.

The practical value is extremely large.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the deodorizing device of the present invention. (Main symbols in the drawing) (1); Exhaust duct (2): Ultraviolet irradiation lamp (3): Ultraviolet irradiation window (5): Fluororesin non-adhesive layer agent Makoto Kuzuno (1 other person)

Claims (4)

[Claims] (1) an exhaust passage; at least one ultraviolet irradiation light source arranged to irradiate a portion of the exhaust passage;
A deodorizing device comprising: an ultraviolet-transparent separation wall disposed between the exhaust passage and an ultraviolet irradiation light source. (2) The deodorizing device according to claim (1), wherein the ultraviolet-transparent isolation wall is made of a transparent fluororesin film or sheet. (3) The deodorizing device according to claim (1), wherein the ultraviolet-transparent isolation wall is made of inorganic glass with excellent ultraviolet-transparent properties. (4) The UV-transparent isolation wall is made of inorganic glass with excellent UV-transmission and a transparent fluororesin-based non-adhesive layer provided at least on the side of the inorganic glass that comes into contact with the exhaust gas. Claim No. 1 characterized in (
The deodorizing device described in section 1).