JP2005080726A - Deodorizing method for contaminated air - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000001877 deodorizing effect Effects 0.000 title claims abstract description 45
- 239000011941 photocatalyst Substances 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 239000000126 substance Substances 0.000 claims description 20
- 238000004332 deodorization Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract 1
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 14
- 230000001699 photocatalysis Effects 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 235000019645 odor Nutrition 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000003463 adsorbent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- WQOXQRCZOLPYPM-UHFFFAOYSA-N dimethyl disulfide Chemical compound CSSC WQOXQRCZOLPYPM-UHFFFAOYSA-N 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 3
- 150000001299 aldehydes Chemical class 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 229910017464 nitrogen compound Inorganic materials 0.000 description 3
- 150000002830 nitrogen compounds Chemical class 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 150000003464 sulfur compounds Chemical class 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 2
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- -1 acetaldehyde, ketones Chemical class 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- QGLKJKCYBOYXKC-UHFFFAOYSA-N nonaoxidotritungsten Chemical compound O=[W]1(=O)O[W](=O)(=O)O[W](=O)(=O)O1 QGLKJKCYBOYXKC-UHFFFAOYSA-N 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- ZFRKQXVRDFCRJG-UHFFFAOYSA-N skatole Chemical compound C1=CC=C2C(C)=CNC2=C1 ZFRKQXVRDFCRJG-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001930 tungsten oxide Inorganic materials 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 1
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000000843 anti-fungal effect Effects 0.000 description 1
- 230000000840 anti-viral effect Effects 0.000 description 1
- 229940121375 antifungal agent Drugs 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 description 1
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229940074386 skatole Drugs 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Landscapes
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
本発明は、生物処理方式生ゴミ処理機等の悪臭発生源から排出される汚染空気から、臭気物質を除去する汚染空気の脱臭方法に関する。 The present invention relates to a method for deodorizing polluted air that removes odorous substances from polluted air discharged from a bad odor source such as a biological treatment system garbage disposal machine.
食品臭、生ゴミ臭、たばこ臭などの悪臭の成分は、多種多様であり、代表的なものとして、アンモニア、アミン類、インドール、スカトールなどの窒素化合物、硫化水素、メチルメルカブタン、硫化メチル、二硫化メチル、二硫化ジメチルなどの硫黄化合物、ホルムアルデヒド、アセトアルデヒドなどのアルデヒド類、アセトンなどのケトン類、メタノール、エタノールなどのアルコール類がある。従来、このような悪臭に対する脱臭方法として、悪臭物質と薬剤とを化学反応させる脱臭方法、芳香剤で悪臭物質をマスキングする脱臭方法、活性炭やゼオライトなどの吸着剤にて悪臭物質を吸着する脱臭方法、または、これらの方法を組み合わせて行う脱臭方法があった。 There are a wide variety of malodorous components such as food odors, garbage odors, and tobacco odors. Typical examples include nitrogen compounds such as ammonia, amines, indole, skatole, hydrogen sulfide, methyl mercaptan, methyl sulfide, There are sulfur compounds such as methyl disulfide and dimethyl disulfide, aldehydes such as formaldehyde and acetaldehyde, ketones such as acetone, and alcohols such as methanol and ethanol. Conventionally, as a deodorizing method for such malodor, a deodorizing method in which a malodorous substance and a chemical are chemically reacted, a deodorizing method in which the malodorous substance is masked with an aromatic agent, and a deodorizing method in which the malodorous substance is adsorbed by an adsorbent such as activated carbon or zeolite. Alternatively, there has been a deodorizing method performed by combining these methods.
このような各種の脱臭方法が使用されているが、特開２００２−２８４５１号公報および特開２０００−７０６７１号公報に開示されている、薬剤および芳香剤を使用する脱臭方法は、共に悪臭物質と反応した後での再生がほとんど不可能である。また、同じく特開２００２−２８４５１号公報および特開２０００−７０６７１号公報に開示されている、吸着剤を使用する脱臭方法も、吸着容量が飽和すると、脱臭性能は著しく低下する。従って、従来のいずれの脱臭方法においても、薬剤等の定期的な交換が必要であったり、あるいは、吸収性能や吸着性能を監視するシステムを設置し、所定のレベルに低下するたびごとに交換作業をする必要があった。 Such various deodorization methods are used. However, the deodorization methods using chemicals and fragrances disclosed in Japanese Patent Application Laid-Open No. 2002-28451 and Japanese Patent Application Laid-Open No. 2000-70671 are both malodorous substances and Regeneration after reaction is almost impossible. Similarly, the deodorization method using an adsorbent disclosed in Japanese Patent Application Laid-Open No. 2002-28451 and Japanese Patent Application Laid-Open No. 2000-70671 has a significant decrease in deodorization performance when the adsorption capacity is saturated. Therefore, in any conventional deodorization method, it is necessary to periodically replace medicines, etc., or install a system to monitor absorption performance and adsorption performance, and replace it every time it falls to a predetermined level. It was necessary to do.
一方、脱臭機能を果たすように、光触媒とランプとを用いる脱臭方法が開発されている。光触媒は、光エネルギーを化学エネルギーに変える物質であり、具体的には、酸化タングステン、酸化チタン、酸化イットリウム、酸化亜鉛などの金属酸化物の半導体である。この脱臭方法では、ランプから紫外線を光触媒に照射して、その光エネルギーによって光触媒を活性化させ、酸化反応を促進させて悪臭物質を無臭物質に変換する。紫外線照射によって光触媒が励起されると、光触媒から電子が飛び出し、表面に吸着した酸素を攻撃してＯ2 -を生成し、また正孔が空気中の水分を攻撃してＯＨラジカルを生成し、これらの活性種により悪臭物質の酸化反応が促進され、最終的に悪臭物質は、水と二酸化炭素等に分解される。 On the other hand, a deodorizing method using a photocatalyst and a lamp has been developed so as to perform a deodorizing function. The photocatalyst is a substance that converts light energy into chemical energy, and specifically, is a semiconductor of a metal oxide such as tungsten oxide, titanium oxide, yttrium oxide, or zinc oxide. In this deodorizing method, the photocatalyst is irradiated with ultraviolet rays from a lamp, the photocatalyst is activated by the light energy, and an oxidation reaction is promoted to convert a malodorous substance into an odorless substance. When the photocatalyst is excited by ultraviolet irradiation, electrons are emitted from the photocatalyst, attacking oxygen adsorbed on the surface to generate O 2 −, and holes attacking moisture in the air to generate OH radicals, These active species promote the oxidation reaction of malodorous substances, and finally the malodorous substances are decomposed into water and carbon dioxide.
しかしながら、光触媒を用いた脱臭方法は、湿度が高い環境においては十分な脱臭効果が得られ難いという問題があった。これに対して、光触媒によって脱臭処理する前の汚染空気の湿度を下げてから、光触媒による脱臭処理を行うことによって、汚染空気の脱臭処理を高効率に行うことが考えられる。たとえば、特開２００２−２９２２３５号公報、特開２００２−２８４５１号公報または特開２０００−７０６７１号公報には、絶対湿度を調整することにより、すなわち、汚染空気の温度を露点以下に下げることにより、汚染空気に含有される水分を冷却して除去する除湿技術や、吸収または吸着減湿装置や除湿剤などにより水分を除去する除湿技術が開示されている。 However, the deodorizing method using a photocatalyst has a problem that it is difficult to obtain a sufficient deodorizing effect in an environment with high humidity. On the other hand, it is conceivable to perform the deodorizing process of the contaminated air with high efficiency by reducing the humidity of the contaminated air before the deodorizing process with the photocatalyst and then performing the deodorizing process with the photocatalyst. For example, in Japanese Patent Application Laid-Open No. 2002-292235, Japanese Patent Application Laid-Open No. 2002-28451 or Japanese Patent Application Laid-Open No. 2000-70671, by adjusting the absolute humidity, that is, by lowering the temperature of the contaminated air below the dew point, A dehumidification technique that cools and removes moisture contained in contaminated air, and a dehumidification technique that removes moisture using an absorption or adsorption dehumidifying device or a dehumidifying agent are disclosed.
しかし、このように、冷却等により水分を除去する方法はきわめてコストが高い。また、冷却自体をその目的の一つとしない限り、これらの冷却技術が一般的に産業上利用されることはまれである。また、吸収または吸着減湿装置や除湿剤などにより水分を除去する方法も、高コストであり維持管理も煩雑である。 However, such a method for removing moisture by cooling or the like is very expensive. In addition, unless cooling itself is one of its purposes, these cooling techniques are rarely used industrially. In addition, a method of removing moisture using an absorption or adsorption dehumidifying device or a dehumidifying agent is also expensive and complicated to maintain.
本発明者による試験の結果から、汚染空気を冷却して水分を除去し、絶対湿度を調整する従来技術は、水分の存在自体が光触媒の性能劣化を惹起する原因であるとの不正確な認識に基づいており、光触媒による脱臭処理に対して最適とは言い難い対策であることがわかった。特開２０００−７０６７１号公報においては、汚染空気中の相対湿度を低下させることが文言上示されているが、採用されている相対湿度の低下方法は、コストの高い冷却法や、維持管理に人的労力と多額の費用を必要とする吸収法あるいは吸着法であり、汚染空気中に含有される水分を除去するものである。したがって、特開２０００−７０６７１号公報に開示された技術も、光触媒反応に対する水分の影響の本質から外れており、簡便で低コストな方法を提供しうるものではない。
本発明は、光触媒による脱臭の効率を著しく高めた汚染空気の脱臭方法を提供することを目的とする。 It is an object of the present invention to provide a method for deodorizing contaminated air with significantly improved efficiency of deodorization by a photocatalyst.
本発明による汚染空気の脱臭方法は、汚染空気中に含まれる臭気物質を、光触媒によって分解および除去をする脱臭方法であって、脱臭処理を行う前の汚染空気を加熱部で加熱処理することによって、汚染空気の相対湿度を１５％以下としてから、光触媒で脱臭処理を行うことを特徴とする。 The deodorizing method for contaminated air according to the present invention is a deodorizing method for decomposing and removing odorous substances contained in the contaminated air with a photocatalyst, and by heating the contaminated air before performing the deodorizing treatment in the heating unit. The deodorizing treatment is performed with a photocatalyst after the relative humidity of the contaminated air is set to 15% or less.
具体的には、加熱部に入る汚染空気の相対湿度を、湿度センサにより計測し、湿度センサの出力に応じて加熱部の加熱量を制御することで、脱臭処理に導入される汚染空気の相対湿度を調整する。 Specifically, the relative humidity of the contaminated air entering the heating unit is measured by a humidity sensor, and the amount of heating of the heating unit is controlled according to the output of the humidity sensor, so that Adjust the humidity.
なお、本発明による汚染空気の脱臭方法は、具体的にはアセトアルデヒド、その他のアルデヒド類に特に適用可能であるが、窒素化合物、硫黄化合物、ケトン類、アルコール類を含めて、悪臭成分全般に適用することができる。 The method for deodorizing contaminated air according to the present invention is specifically applicable to acetaldehyde and other aldehydes, but is applicable to all malodorous components including nitrogen compounds, sulfur compounds, ketones and alcohols. can do.
本発明の方法により、空気中の臭気物質、有害物質の分解および除去を、著しく高効率で行うことが可能となり、優れた脱臭効果を得ることができる。 According to the method of the present invention, it is possible to decompose and remove odorous substances and harmful substances in the air with extremely high efficiency, and an excellent deodorizing effect can be obtained.
本発明の脱臭方法は、汚染空気を加熱することで、絶対湿度を調整することなく、すなわち、汚染空気に含有される水分を除去することなく、汚染空気の相対湿度を下げることにより、光触媒表面の臭気物質の吸着および脱離や分解反応を促進して、脱臭性能を著しく改善するものである。また、加熱方法を採用することで、初期コストおよび運転コストが小さい点でも大きなメリットがある。 The deodorizing method of the present invention heats the contaminated air without adjusting the absolute humidity, that is, without removing moisture contained in the contaminated air, thereby reducing the relative humidity of the contaminated air. It promotes adsorption, desorption and decomposition reactions of odorous substances, and remarkably improves deodorizing performance. In addition, adopting the heating method has a great merit in that the initial cost and the operation cost are small.
本発明において、相対湿度を制御因子として、汚染空気の相対湿度は、１５％以下とする。相対湿度が１５％を超えたままでは、光触媒の表面に水分吸着しやすくなり、臭気物質の分解が著しく抑制され、光触媒の表面が水分で覆われると、好ましくない副生成物も生成しやすくなることが挙げられる。 In the present invention, the relative humidity is set to 15% or less with the relative humidity as a control factor. If the relative humidity exceeds 15%, moisture is easily adsorbed on the surface of the photocatalyst, decomposition of odorous substances is remarkably suppressed, and when the surface of the photocatalyst is covered with moisture, undesired by-products are easily generated. Can be mentioned.
本発明における汚染空気の相対湿度を１５％以下に制御するためには、たとえば、加熱装置の手前に設置された湿度センサと温度センサにより、それぞれ相対湿度信号および温度信号を発生させ、補償装置により、これらの信号に基づいて補償された相対湿度信号を発生させ、制御装置により、補償された相対湿度信号に基づいて、加熱装置に出力信号を送り、汚染空気の温度を上昇させる方法が採用できる。 In order to control the relative humidity of the contaminated air to 15% or less in the present invention, for example, a relative humidity signal and a temperature signal are generated by a humidity sensor and a temperature sensor installed in front of the heating device, respectively, and a compensation device is used. A method of generating a compensated relative humidity signal based on these signals and sending an output signal to the heating device based on the compensated relative humidity signal by the control device to increase the temperature of the contaminated air can be adopted. .
本発明に使用される光触媒は、０．５〜５ｅＶの禁止帯幅を有し、光触媒反応をもたらす光反応性半導体である。このような光触媒として、酸化亜鉛、酸化タングステン、酸化チタンおよび酸化セリウムなどの金属酸化物粒子が挙げられる。特に、酸化チタンは、その構造安定性、光反応性有害物除去能、さらには取扱い上の安全性などから、生活空間において使用するには最も適しており、本発明に係る光触媒として有利に用いられる。 The photocatalyst used in the present invention is a photoreactive semiconductor that has a band gap of 0.5 to 5 eV and brings about a photocatalytic reaction. Examples of such a photocatalyst include metal oxide particles such as zinc oxide, tungsten oxide, titanium oxide, and cerium oxide. In particular, titanium oxide is most suitable for use in living space because of its structural stability, ability to remove photoreactive harmful substances, and safety in handling, and is advantageously used as a photocatalyst according to the present invention. It is done.
本発明に係る光触媒は、取扱いの簡便さから、光触媒を担持した部材または光触媒からなる部材に成形することが好ましい。この光触媒部材は、活性炭、ゼオライトなどの吸着剤を含むものが好ましく、特に、光触媒を担持した繊維状シートからなる部材であることが好ましい。 The photocatalyst according to the present invention is preferably molded into a member carrying a photocatalyst or a member made of a photocatalyst for ease of handling. The photocatalyst member preferably contains an adsorbent such as activated carbon or zeolite, and is particularly preferably a member made of a fibrous sheet carrying a photocatalyst.
光触媒部材の具体例として、平坦なシート状、平坦な板状、波板状などの多孔質体の他に、通風性を有するハニカム状、コルゲート状、フォーム状などの多孔質体などを挙げることができる。 As specific examples of the photocatalyst member, in addition to a porous body such as a flat sheet shape, a flat plate shape, and a corrugated plate shape, a porous body such as a honeycomb shape having a ventilation property, a corrugated shape, and a foam shape may be mentioned. Can do.
前記湿度センサおよび湿度センサは、市販品のいずれでも、公知技術を利用した回路のいずれも採用できる。また、前記制御装置も、公知技術を利用した装置のいずれも採用できる。 As the humidity sensor and the humidity sensor, any of commercially available products and any circuit using a known technique can be adopted. The control device can be any device using a known technique.
本発明の汚染空気の脱臭方法においては、光触媒部材に励起光を照射する必要があり、励起光照射の手段としては、専用光源を用いる照射、屋外や窓際での日光の照射、および室内照明光など他の目的で使用される光の利用などを挙げることができる。励起光の照射は、連続または断続のいずれかを採ることも可能である。 In the method for deodorizing contaminated air of the present invention, it is necessary to irradiate the photocatalyst member with excitation light, and as means for irradiating excitation light, irradiation using a dedicated light source, irradiation of sunlight outdoors or near a window, and indoor illumination light And the use of light used for other purposes. The excitation light irradiation can be either continuous or intermittent.
本発明の汚染空気の脱臭方法においては、空気を通風させながら脱臭処理をすることが一般的であり、通風手段として、シロッコ型、ターボ型、ラジアル型、軸流型、プロペラ型、クロスフロー型などのファンモーターや熱対流によるものなどを利用してもよい。 In the method for deodorizing contaminated air of the present invention, it is common to perform a deodorizing treatment while allowing air to flow, and as a ventilation means, sirocco type, turbo type, radial type, axial flow type, propeller type, cross flow type A fan motor such as the one using heat convection or the like may be used.
本発明の汚染空気の脱臭方法においては、光触媒方式以外の空気浄化手段、たとえば、除塵フィルターや集塵電極ユニットなどによる除塵、活性炭などの吸着剤や二酸化マンガンなどの酸化触媒などを用いた脱臭、抗菌、防黴、抗ウィルスなどのような浄化手段を併用してもよい。 In the method for deodorizing contaminated air of the present invention, air purification means other than the photocatalytic method, for example, dust removal by a dust filter or a dust collecting electrode unit, deodorization using an adsorbent such as activated carbon or an oxidation catalyst such as manganese dioxide, Purifying means such as antibacterial, antifungal and antiviral may be used in combination.
このような浄化手段は、加熱前や、加熱後で光触媒処理前、または、光触媒処理後に、適宜、設けることができる。さらに、複数の浄化手段を集中して設置してもよく、各々分散して設置してもよいが、一般的には、除塵や脱臭などの処理は、光触媒処理前に設置することが好ましく、加熱後で光触媒処理前に設けることがさらに好ましい。 Such purification means can be provided as appropriate before heating, after heating, before photocatalytic treatment, or after photocatalytic treatment. Furthermore, a plurality of purification means may be installed in a concentrated manner, or may be installed in a dispersed manner, but in general, treatment such as dust removal and deodorization is preferably installed before the photocatalytic treatment, More preferably, it is provided after the heating and before the photocatalytic treatment.
本発明の汚染空気の脱臭方法において、処理前後の空気の温度変化を望まない場合には、光触媒処理後に、適宜、熱交換することによって処理ガスの温度を下げることもできる。 In the method for deodorizing contaminated air according to the present invention, when it is not desired to change the temperature of the air before and after the treatment, the temperature of the treatment gas can be lowered by appropriately exchanging heat after the photocatalytic treatment.
以下、本発明を、アセトアルデヒドを対象とした実施例により説明するが、本発明はこれらの実施例に限定されない。窒素化合物、硫黄化合物、アルデヒド類、アルコール類などの汚染物質に広く適用可能である。 Hereinafter, the present invention will be described with reference to examples targeting acetaldehyde, but the present invention is not limited to these examples. Widely applicable to pollutants such as nitrogen compounds, sulfur compounds, aldehydes and alcohols.
（実施例１）
汚染空気導入部、汚染空気加熱部、汚染空気の脱臭処理を行う光触媒反応器部、ファンを順次配置した試験用脱臭装置を作製し、汚染空気導入部が吸気側となり、ファンが排気側となるように、汚染空気を通風した。
(Example 1)
Produced a deodorizing device for testing, in which a contaminated air introduction unit, a contaminated air heating unit, a photocatalytic reactor unit for deodorizing contaminated air, and a fan are arranged in order, and the contaminated air introduction unit is on the intake side and the fan is on the exhaust side So that the polluted air was ventilated.
汚染空気として、温度３５℃、相対湿度５９％、アセトアルデヒド濃度４２ｐｐｍの模擬汚染空気を用いた。この汚染空気を、風量が毎分０．５ｍ3 となるように、通風した。汚染空気加熱部では、汚染空気を加熱し、温度を６４℃まで上昇させた。光触媒は、酸化チタンを担持したコルゲートハニカム（ハニカム容積が４．８リットル）を用いた。光触媒を励起する光源には、ピーク波長３６０ｎｍの紫外光を発するブラックライト（１０Ｗ）１４本を使用した。 As contaminated air, simulated contaminated air having a temperature of 35 ° C., a relative humidity of 59%, and an acetaldehyde concentration of 42 ppm was used. The contaminated air was ventilated so that the air volume was 0.5 m 3 per minute. In the contaminated air heating section, the contaminated air was heated to raise the temperature to 64 ° C. As the photocatalyst, a corrugated honeycomb (honeycomb volume: 4.8 liters) carrying titanium oxide was used. As a light source for exciting the photocatalyst, 14 black lights (10 W) emitting ultraviolet light having a peak wavelength of 360 nm were used.
汚染空気導入部の入口において、温度および相対湿度を測定し、表１に示した。なお、湿度温度計（ＶＡＩＳＡＬＡ社製、型式ＨＭＩ４１＆ＨＭＰ４５）により測定した。光触媒反応器部の入口において加温された汚染空気の温度を測定し、次の式で相対湿度を計算した。Ｈ２＝Ｈ１×（Ｐ１／Ｐ２）、ここで、Ｈ２は光触媒反応器部の入口における相対湿度、Ｈ１は汚染空気導入部の入口における相対湿度、Ｐ２は光触媒反応器部の入口における飽和水蒸気圧、Ｐ１は汚染空気導入部の入口における飽和水蒸気圧である。なお、測定された温度における飽和水蒸気圧はＪＩＳ８８０６の付表１−１より求めた。さらに、処理ガスのアセトアルデヒド濃度（ｐｐｍ）を、ガスクロマトグラフで分析することにより測定し、アセトアルデヒド除去率を算出して、表１に示した。 The temperature and relative humidity were measured at the entrance of the contaminated air inlet and are shown in Table 1. In addition, it measured with the humidity thermometer (the product made from VAISALA, model HMI41 & HMP45). The temperature of the contaminated air heated at the inlet of the photocatalytic reactor was measured, and the relative humidity was calculated by the following equation. H2 = H1 × (P1 / P2), where H2 is the relative humidity at the inlet of the photocatalytic reactor section, H1 is the relative humidity at the inlet of the contaminated air introduction section, P2 is the saturated water vapor pressure at the inlet of the photocatalytic reactor section, P1 is the saturated water vapor pressure at the inlet of the contaminated air introduction section. In addition, the saturated water vapor pressure at the measured temperature was obtained from Appendix 1-1 of JIS 8806. Furthermore, the acetaldehyde concentration (ppm) of the treatment gas was measured by analyzing with a gas chromatograph, and the acetaldehyde removal rate was calculated and shown in Table 1.
（実施例２）
汚染空気加熱部で汚染空気を加熱し、温度を７０℃まで上昇させた以外は、実施例１と同様にして、脱臭装置を運転した。実施例１と同様に諸値を測定して、表１に示した。
(Example 2)
The deodorizing apparatus was operated in the same manner as in Example 1 except that the contaminated air was heated by the contaminated air heating unit and the temperature was raised to 70 ° C. Various values were measured in the same manner as in Example 1 and shown in Table 1.
（比較例１）
汚染空気加熱部で汚染空気を加熱し、温度を５６℃まで上昇させた以外は、実施例１と同様にして、脱臭装置を運転した。実施例１と同様に諸値を測定して、表１に示した。
(Comparative Example 1)
The deodorizing apparatus was operated in the same manner as in Example 1 except that the contaminated air was heated by the contaminated air heating unit and the temperature was raised to 56 ° C. Various values were measured in the same manner as in Example 1 and shown in Table 1.
（比較例２）
汚染空気加熱部から、加熱装置を外した以外は、実施例１と同様にして、脱臭装置を運転した。実施例１と同様に諸値を測定して、表１に示した。
The deodorizing apparatus was operated in the same manner as in Example 1 except that the heating apparatus was removed from the contaminated air heating section. Various values were measured in the same manner as in Example 1 and shown in Table 1.
一方、比較例１でも、同様に汚染空気を加熱しているが、相対湿度が２０．１％までにしか下がっていない。その結果、アセトアルデヒド除去率は７４％であり、実施例１および実施例２に比べて著しく低かった。 On the other hand, in Comparative Example 1, the contaminated air is similarly heated, but the relative humidity is reduced only to 20.1%. As a result, the acetaldehyde removal rate was 74%, which was significantly lower than that of Example 1 and Example 2.
また、比較例２では、相対湿度を低下させる処理を一切行わずに、汚染空気を光触媒に通したところ、アセトアルデヒド除去率は４５％であり、実施例１および実施例２に比べて著しく低かった。 Further, in Comparative Example 2, when contaminated air was passed through the photocatalyst without performing any treatment for reducing the relative humidity, the acetaldehyde removal rate was 45%, which was significantly lower than that of Example 1 and Example 2. .
本発明は、生物処理方式生ゴミ処理機の悪臭を有する排気の脱臭処理や、溶剤などの揮発性有害有機化合物で汚染された室内空気などの清浄化にも利用可能である。 The present invention can also be used for deodorizing exhaust gas having a bad odor from a biological treatment system garbage processing machine, and cleaning indoor air contaminated with a volatile harmful organic compound such as a solvent.
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