JPH09155152A - Method and device for removal of nitrogen oxide - Google Patents
Method and device for removal of nitrogen oxideInfo
- Publication number
- JPH09155152A JPH09155152A JP7315587A JP31558795A JPH09155152A JP H09155152 A JPH09155152 A JP H09155152A JP 7315587 A JP7315587 A JP 7315587A JP 31558795 A JP31558795 A JP 31558795A JP H09155152 A JPH09155152 A JP H09155152A
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- carbon filter
- nitrogen
- air
- ozone generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、家庭内で燃焼機器から
発生する窒素酸化物（一酸化窒素や二酸化窒素）を除去
する空気清浄器、あるいはトンネル内の窒素酸化物除去
装置に用いられる窒素酸化物の除去方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier for removing nitrogen oxides (nitrogen monoxide and nitrogen dioxide) generated from combustion equipment at home, or nitrogen used for a nitrogen oxide removing device in a tunnel. The present invention relates to a method for removing oxides.
【０００２】[0002]
【従来の技術】窒素酸化物は喘息などの原因物質である
ため、近年、窒素酸化物の除去に対し関心が高まってい
る。また、窒素酸化物は酸性雨の原因物質であり、規制
が行われているが、大都市圏では規制値を越える濃度も
測定されており、社会問題になっている。家庭内におけ
る窒素酸化物の発生源として、暖房機、ガスコンロなど
の燃焼機器に由来するものが挙げられる。また、大都市
圏では戸外から流入する窒素酸化物も存在する。発生源
や環境にもよるが、これらの窒素酸化物の内の約半分が
一酸化窒素であり、残りの半分が二酸化窒素であるとい
われている。二酸化窒素は塩基性物質やある種のキレー
ト物質などにより吸収させることが可能であり、これら
の塩基性物質やキレート物質等は、すでに家庭用空気清
浄器や吸気型換気扇のフィルタなどに使用されている。
一方、一酸化窒素はこれらの物質に吸着しにくいため、
過マンガン酸カリウムなどの酸化剤により酸化させた
後、二酸化窒素として浄化する方法が提案されている。2. Description of the Related Art Nitrogen oxide is a causative substance for asthma and the like, and therefore, interest in removing nitrogen oxide has been increasing in recent years. Nitrogen oxide is a causative agent of acid rain and is regulated. In metropolitan areas, however, the concentration exceeding the regulated value has been measured, which has become a social problem. Sources of nitrogen oxides in the home include those derived from combustion equipment such as heaters and gas stoves. Also, in the metropolitan area, there are nitrogen oxides flowing in from the outside. It is said that about half of these nitrogen oxides are nitric oxide and the other half are nitrogen dioxide, depending on the source and environment. Nitrogen dioxide can be absorbed by basic substances and certain chelating substances, and these basic substances and chelating substances have already been used in home air cleaners and filters of intake type ventilation fans. There is.
On the other hand, since nitric oxide is difficult to adsorb to these substances,
A method of purifying as nitrogen dioxide after oxidizing with an oxidizing agent such as potassium permanganate has been proposed.
【０００３】また、車両からの排気ガスが滞留するトン
ネル内での窒素酸化物除去も大きな課題である。このよ
うな状況での窒素酸化物の除去方法として、オゾンによ
り一酸化窒素を二酸化窒素に酸化し、塩基性吸収剤によ
り吸収除去する方法が提案されている。この場合、吸収
剤が飽和に達した後、吸収剤を水洗、乾燥し、塩基性物
質を担持した後、再利用する。また、酸化チタンなどを
活性炭に担持させ、紫外光による光触媒作用によって一
酸化窒素を酸化し、二酸化窒素として活性炭に吸着させ
る方法も提案されている。この場合には、活性炭の吸着
能力が飽和に達した時点で活性炭を水洗、乾燥すること
により活性炭を再生する。Further, removal of nitrogen oxides in a tunnel where exhaust gas from a vehicle stays is also a big problem. As a method for removing nitrogen oxides in such a situation, a method has been proposed in which nitric oxide is oxidized to nitrogen dioxide by ozone and is absorbed and removed by a basic absorbent. In this case, after the absorbent reaches saturation, the absorbent is washed with water, dried, and loaded with a basic substance, and then reused. Further, a method has also been proposed in which titanium oxide or the like is supported on activated carbon, nitric oxide is oxidized by a photocatalytic action by ultraviolet light, and is adsorbed on activated carbon as nitrogen dioxide. In this case, when the adsorption capacity of the activated carbon reaches saturation, the activated carbon is washed with water and dried to regenerate the activated carbon.
【０００４】[0004]
【発明が解決しようとする課題】しかし、塩基性物質や
キレート物質により二酸化窒素を吸収する方法では、窒
素酸化物と吸収剤が反応して安定化してしまうため、再
生が困難であった。また、過マンガン酸カリウムなどの
酸化剤により一酸化窒素を酸化する方法についても、酸
化剤が還元されてしまうために酸化剤の定期的な交換が
必要であった。さらに、トンネル内の窒素酸化物除去装
置として、塩基性吸収剤で窒素酸化物を吸収させる方法
を用いた場合には、再生時にアルカリ金属塩のような吸
収剤を再び担体基材に担持させなければいけないなど、
特殊な処理が必要であるといった問題があった。また、
一酸化窒素を光触媒作用によって酸化する場合には、紫
外光発生光源が必要であったり、野外で太陽光があると
きのみしか作動しないなどの点が課題として残る。However, in the method of absorbing nitrogen dioxide with a basic substance or a chelating substance, regeneration is difficult because the nitrogen oxide and the absorber react and become stable. Further, in the method of oxidizing nitric oxide with an oxidizing agent such as potassium permanganate, the oxidizing agent is reduced, so that it is necessary to periodically replace the oxidizing agent. Furthermore, when a method of absorbing nitrogen oxides with a basic absorbent is used as a device for removing nitrogen oxides in the tunnel, an absorbent such as an alkali metal salt must be loaded on the carrier substrate again during regeneration. Don't do it,
There was a problem that special processing was required. Also,
When nitric oxide is oxidized by photocatalysis, problems such as the need for an ultraviolet light source and the fact that it operates only when there is sunlight outdoors remain.
【０００５】[0005]
【課題を解決するための手段】本発明の窒素酸化物の除
去方法は、窒素酸化物を含む外部空気を吸入する工程
と、オゾン発生器からオゾンを放出させ、前記空気中の
一酸化窒素を二酸化窒素に酸化する工程と、前記空気中
の二酸化窒素を活性炭フィルタに吸着させ除去する工程
と、吸着能力の低下した前記活性炭フィルタを水洗、乾
燥することにより前記活性炭フィルタに吸着した窒素酸
化物を除去し、前記活性炭フィルタを再生させる工程を
含むものである。A method for removing nitrogen oxides according to the present invention comprises a step of inhaling external air containing nitrogen oxides and a step of releasing ozone from an ozone generator to remove nitric oxide in the air. A step of oxidizing to nitrogen dioxide, a step of adsorbing and removing nitrogen dioxide in the air on an activated carbon filter, washing the activated carbon filter having a reduced adsorption capacity with water, and drying to remove nitrogen oxides adsorbed on the activated carbon filter. The step of removing and regenerating the activated carbon filter is included.
【０００６】また、窒素酸化物を含む外部空気を吸入す
る工程と、オゾン発生器からオゾンを放出させ、前記空
気中の一酸化窒素を二酸化窒素に酸化する工程と、前記
空気中の二酸化窒素を活性炭フィルタにより吸着除去す
る工程と、前記オゾン発生器を停止し、外部との空気の
流通を遮断し、かつ内部に残留した空気を前記活性炭フ
ィルタを通過するように循環させ、前記活性炭フィルタ
を加熱することにより前記活性炭フィルタを再生させる
工程を含むものである。本発明の窒素酸化物除去装置
は、装置の吸気口側に配されたオゾン発生器と、前記オ
ゾン発生器の下流に配された活性炭フィルタと、前記活
性炭フィルタ近傍に設置された前記活性炭フィルタを加
熱する加熱装置と、前記オゾン発生器の下流に配された
外部空気を吸入するファンと、前記活性炭フィルタ、前
記加熱装置および前記ファンを挟んだ上流側と下流側を
結ぶバイパスと、前記バイパスを開閉するバイパス内ダ
ンパと、前記オゾン発生器と前記バイパスの上流側開口
部の間に配された吸気口側ダンパと、前記バイパスの下
流側開口部の下流に配された排気口側ダンパを具備する
ものである。Further, a step of inhaling external air containing nitrogen oxides, a step of releasing ozone from an ozone generator to oxidize nitric oxide in the air into nitrogen dioxide, and a step of removing nitrogen dioxide in the air A step of adsorbing and removing with an activated carbon filter, stopping the ozone generator, blocking the flow of air with the outside, and circulating the air remaining inside to pass through the activated carbon filter, and heating the activated carbon filter. By doing so, a step of regenerating the activated carbon filter is included. The nitrogen oxide removing device of the present invention comprises an ozone generator disposed on the intake side of the device, an activated carbon filter disposed downstream of the ozone generator, and the activated carbon filter installed near the activated carbon filter. A heating device for heating, a fan for sucking external air arranged downstream of the ozone generator, a bypass connecting the upstream side and the downstream side sandwiching the activated carbon filter, the heating device and the fan, and the bypass. It includes a bypass internal damper that opens and closes, an intake-side damper disposed between the ozone generator and an upstream opening of the bypass, and an exhaust-side damper disposed downstream of the downstream opening of the bypass. To do.
【０００７】[0007]
【発明の実施の形態】以下、本発明の具体的な実施例に
ついて説明する。 ［実施例１］本発明の請求項１の窒素酸化物の除去方法
について説明する。本実施例の窒素酸化物除去装置を図
１に示す。ステンレス鋼製で４角筒状の外枠１は、内部
に断面が一辺１５ｃｍの正方形の空気流路を持つ。この
空気流路の吸気口側にはオゾン発生器３が設置されてい
る。オゾン発生器３の下流には、外枠１の上部から活性
炭フィルタ４を引き出せるよう外枠１の上部に切り欠き
部１ａが設けられており、この切り欠き部１ａの外側よ
り活性炭フィルタ４が挿入されている。活性炭フィルタ
４を図２に示す。この活性炭フィルタ４は、以下の方法
で作製した。一辺１５ｃｍの正方形で、厚さが２ｍｍの
活性炭繊維シートを硝酸鉄水溶液に含浸し、真空下で加
熱することにより、酸化鉄約５ｗｔ％を活性炭繊維に担
持させた。この活性炭繊維シートを、両面から金網８で
挟み込んでフィルタケース７中に固定した。フィルタケ
ース７の上部にはでっぱりが設けられており、活性炭フ
ィルタ４を外枠１の切り欠き部１ａから簡単に引き出せ
るようにした。なお、外枠１内壁と活性炭フィルタ４の
隙間から空気が漏れ、活性炭フィルタ４を通過すること
なく二酸化窒素が排出されるのを防ぐため、活性炭フィ
ルタ４と外枠１内壁の隙間にシールを施した。また、縦
１５ｃｍ、横７．５ｃｍで厚さ１ｃｍのコージェライト
製のハニカム状担体に銅とマンガンの複合酸化物を担持
させたオゾン分解触媒５を、２枚、横に並べて空気流路
の活性炭フィルタ４の下流に取り付けた。さらに、オゾ
ン分解触媒５の下流に空気吸入用のファン６を設けた。BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the present invention will be described below. Example 1 A method for removing nitrogen oxides according to claim 1 of the present invention will be described. FIG. 1 shows the nitrogen oxide removing apparatus of this embodiment. The outer frame 1 made of stainless steel and in the shape of a square cylinder has a square air flow passage having a cross section of 15 cm on a side. An ozone generator 3 is installed on the intake side of this air flow path. Downstream of the ozone generator 3, a notch 1a is provided in the upper part of the outer frame 1 so that the activated carbon filter 4 can be pulled out from the upper part of the outer frame 1, and the activated carbon filter 4 is inserted from the outside of the notch 1a. Has been done. The activated carbon filter 4 is shown in FIG. This activated carbon filter 4 was produced by the following method. An activated carbon fiber sheet having a side length of 15 cm and a thickness of 2 mm was impregnated with an iron nitrate aqueous solution and heated under vacuum to support about 5 wt% of iron oxide on the activated carbon fiber. This activated carbon fiber sheet was sandwiched by wire meshes 8 from both sides and fixed in the filter case 7. A protrusion is provided on the upper portion of the filter case 7 so that the activated carbon filter 4 can be easily pulled out from the cutout portion 1 a of the outer frame 1. In order to prevent air from leaking from the gap between the inner wall of the outer frame 1 and the activated carbon filter 4 and discharging nitrogen dioxide without passing through the activated carbon filter 4, a seal is provided in the gap between the activated carbon filter 4 and the inner wall of the outer frame 1. did. In addition, two ozone decomposition catalysts 5 each having a composite oxide of copper and manganese supported on a honeycomb carrier made of cordierite having a length of 15 cm, a width of 7.5 cm and a thickness of 1 cm are arranged side by side, and activated carbon in the air flow path is arranged. It was attached downstream of filter 4. Further, a fan 6 for sucking air is provided downstream of the ozone decomposition catalyst 5.
【０００８】以下、具体的に窒素酸化物の除去方法を説
明する。ファン６を回転させることにより、装置内に矢
印方向より空気を流入させる。流入した窒素酸化物を含
む空気は、オゾン発生器３によって生成されたオゾンに
より処理される。この時、活性炭フィルタ４に吸着しに
くい一酸化窒素は二酸化窒素に酸化される。その後、空
気中の窒素酸化物（主に二酸化窒素）は、活性炭フィル
タ４により吸着除去される。また、酸化剤として消費さ
れなかったオゾンは、活性炭フィルタ４により分解され
る。活性炭フィルタ４の二酸化窒素吸着能力が飽和する
と、オゾンの発生を停止し、活性炭フィルタ４を取り出
し、水洗、乾燥することにより、二酸化窒素の吸着能力
を再生させる。再生後、再び上記方法で、窒素酸化物の
除去を行う。オゾン発生器３の下流に、二酸化マンガン
や酸化銅、あるいはこれらの複合酸化物などのオゾン分
解触媒５を配することにより、さらに効果的に排出オゾ
ンを減少させることができる。A method for removing nitrogen oxides will be specifically described below. By rotating the fan 6, air is made to flow into the device in the direction of the arrow. The inflowing air containing nitrogen oxides is treated with ozone generated by the ozone generator 3. At this time, nitric oxide which is difficult to be adsorbed on the activated carbon filter 4 is oxidized to nitrogen dioxide. After that, nitrogen oxides (mainly nitrogen dioxide) in the air are adsorbed and removed by the activated carbon filter 4. Ozone not consumed as an oxidant is decomposed by the activated carbon filter 4. When the nitrogen dioxide adsorption capacity of the activated carbon filter 4 becomes saturated, the generation of ozone is stopped, and the activated carbon filter 4 is taken out, washed with water and dried to regenerate the nitrogen dioxide adsorption capacity. After the regeneration, the nitrogen oxide is removed again by the above method. By arranging the ozone decomposition catalyst 5 such as manganese dioxide, copper oxide, or a composite oxide thereof, downstream of the ozone generator 3, it is possible to more effectively reduce the emitted ozone.
【０００９】この窒素酸化物除去装置を容積１ｍ3のア
クリル樹脂製の立方体の容器内に設置し、外部から一酸
化窒素と二酸化窒素をそれぞれ２．５ｐｐｍになるよう
に注入して容器を密閉した。なお、窒素酸化物の分析は
化学発光式ＮＯx分析計で行った。その後、ファン６の
回転およびオゾン発生器３によるオゾンの生成を開始
し、窒素酸化物の浄化を開始した。開始から３０分経過
後の容器内における窒素酸化物の濃度は１ｐｐｍであ
り、本除去装置により窒素酸化物が除去できることが確
認された。浄化開始３０分後にファン６およびオゾン発
生器３を停止し、容器を開放することにより、容器内の
空気を入れ換えた。これら一連の浄化・換気を繰り返し
行い、浄化開始３０分経過後の窒素酸化物の濃度が４ｐ
ｐｍになった時点で、活性炭の再生を行った。活性炭の
再生は、活性炭フィルタ４を取り出し、水道水で活性炭
フィルタ４を洗浄し、日光で乾燥させることにより行っ
た。再生後の活性炭フィルタ４を窒素酸化物除去装置に
再設置し、再び同様の窒素酸化物浄化試験を行ったとこ
ろ、実験開始から３０分後の窒素酸化物濃度は１．１ｐ
ｐｍであり、活性炭フィルタ４の窒素酸化物吸着能力が
再生されていることが確認された。This nitrogen oxide removing device was installed in a cubic container made of acrylic resin having a volume of 1 m 3 , and nitrogen monoxide and nitrogen dioxide were injected from the outside so that the concentration of each was 2.5 ppm and the container was sealed. . Incidentally, the analysis of nitrogen oxides was conducted by chemiluminescent NO x analyzer. After that, rotation of the fan 6 and generation of ozone by the ozone generator 3 were started, and purification of nitrogen oxides was started. The concentration of nitrogen oxides in the container after 30 minutes from the start was 1 ppm, and it was confirmed that the nitrogen oxides could be removed by the present removing device. After 30 minutes from the start of purification, the fan 6 and the ozone generator 3 were stopped, and the container was opened to replace the air in the container. This series of purification and ventilation is repeated until the concentration of nitrogen oxides reaches 4p after 30 minutes from the start of purification.
When it reached pm, the activated carbon was regenerated. Regeneration of the activated carbon was performed by taking out the activated carbon filter 4, washing the activated carbon filter 4 with tap water, and drying it with sunlight. When the activated carbon filter 4 after regeneration was re-installed in the nitrogen oxide removing device and the same nitrogen oxide purification test was performed again, the nitrogen oxide concentration 30 minutes after the start of the experiment was 1.1 p.
It was pm, and it was confirmed that the nitrogen oxide adsorption capacity of the activated carbon filter 4 was regenerated.
【００１０】また、本発明で用いられる活性炭の形状
は、繊維状、ハニカム状、粒状のいずれでもよく、無機
繊維や、樹脂、セラミックスに担持もしくは含有させて
用いてもよい。さらに、活性炭に鉄酸化物などの金属酸
化物を含有させることにより窒素酸化物の吸着能力を向
上させることが可能である。The shape of the activated carbon used in the present invention may be fibrous, honeycomb or granular, and may be carried or contained in inorganic fibers, resins or ceramics. Furthermore, it is possible to improve the adsorption ability of nitrogen oxides by including metal oxides such as iron oxides in the activated carbon.
【００１１】［実施例２］本発明の請求項２の窒素酸化
物の除去方法を用いた窒素酸化物除去装置について詳細
に説明する。本実施例の窒素酸化物除去装置を図３に示
す。ステンレス鋼製で４角筒状の外枠１１は、内部が縦
１５ｃｍ、横１５ｃｍの正方形の空気流路を持つ。この
流路の吸気口側にはオゾン発生器１３が設置されてい
る。オゾン発生器１３の下流には、外枠１の上部から活
性炭フィルタ１４を引き出せるよう外枠１１の上部に切
り欠き部１１ａが設けられており、外側より活性炭フィ
ルタ１４が挿入されている。活性炭フィルタ１４の下流
にはオゾン分解触媒１５が配されている。この装置は、
実施例１で用いたものと同様の窒素酸化物除去装置にお
いて、ファン１６の下流側と活性炭フィルタ１４の上流
側にそれぞれ開口部を設け、両開口部に通じるバイパス
１９を設けたものである。また、バイパス１９内にはバ
イパス内ダンパ２０を設けている。さらに、活性炭フィ
ルタ１４上流のバイパス１１の開口部の開口部側（上流
側）に吸気口側ダンパ１７を、ファン１６下流のバイパ
ス１１開口部の排気口側（下流側）に排気口側ダンパ１
８をそれぞれ設けている。また、活性炭フィルタ１４の
下流側の活性炭フィルタ１４に近接した位置に、２本の
石英ヒータ２１を活性炭フィルタ１４と平行に、かつ水
平に設置し、活性炭フィルタ１４を下流側から加熱でき
るようにした。[Embodiment 2] A nitrogen oxide removing apparatus using the method for removing nitrogen oxides according to claim 2 of the present invention will be described in detail. The nitrogen oxide removing apparatus of this embodiment is shown in FIG. The outer frame 11 made of stainless steel and having a rectangular tubular shape has a square air flow passage having a length of 15 cm and a width of 15 cm inside. An ozone generator 13 is installed on the intake port side of this flow path. Downstream of the ozone generator 13, a notch 11a is provided in the upper portion of the outer frame 11 so that the activated carbon filter 14 can be pulled out from the upper portion of the outer frame 1, and the activated carbon filter 14 is inserted from the outside. An ozone decomposition catalyst 15 is arranged downstream of the activated carbon filter 14. This device is
In a nitrogen oxide removing apparatus similar to that used in Example 1, openings are provided on the downstream side of the fan 16 and the upstream side of the activated carbon filter 14, respectively, and a bypass 19 leading to both openings is provided. In addition, a bypass damper 20 is provided in the bypass 19. Further, the intake port side damper 17 is provided on the opening side (upstream side) of the opening part of the bypass 11 upstream of the activated carbon filter 14, and the exhaust port side damper 1 is provided on the exhaust port side (downstream side) of the bypass 11 opening part downstream of the fan 16.
8 are provided respectively. Further, two quartz heaters 21 are installed parallel to and horizontally with the activated carbon filter 14 at a position close to the activated carbon filter 14 on the downstream side of the activated carbon filter 14 so that the activated carbon filter 14 can be heated from the downstream side. .
【００１２】次に、本実施例の窒素酸化物除去方法を具
体的に説明する。本実施例の窒素酸化物除去装置は、装
置内の空気を活性炭フィルタ１４に循環させるバイパス
１９と活性炭フィルタ１４を加熱するヒータ２１を有し
ている。通常、装置外部の空気を吸入する際には、図３
の（ａ）に示すように、バイパス内ダンパ２０は閉鎖さ
れ、吸気口側ダンパ１７および排気口側ダンパ１８は開
放しており、実施例１と同様の方法で窒素酸化物の除去
を行う。活性炭フィルタ１４の二酸化窒素吸着能力が飽
和すると、オゾン発生器１３によるオゾンの生成を停止
し、図３の（ｂ）に示すように、吸気口側ダンパ１７お
よび排気口側ダンパ１８を閉鎖し、バイパス内ダンパ２
０を開放する。それにより装置内の空気は、バイパス１
９内を矢印方向に循環する。この時、除去装置の外部に
は装置内の空気が漏れないように設計した。このような
状態で、活性炭フィルタ１４近傍に設置されたヒータ２
１により活性炭フィルタ１４の加熱を行う。加熱によ
り、活性炭フィルタ１４に吸着された二酸化炭素の一部
は活性炭フィルタ１４および空気中の酸素と反応し窒素
へと変換される。また、二酸化窒素のまま、もしくは一
酸化窒素に還元された状態で活性炭フィルタ１４から脱
着した窒素酸化物は、装置外に放出されることなく、バ
イパス１９を通り再び加熱された活性炭フィルタ１４に
循環されるため、最終的には大部分が窒素へと還元され
る。こうして、活性炭フィルタ１４の再生及び窒素酸化
物の還元が完了した後、加熱を停止し、再びオゾン発生
器１３と活性炭フィルタ１４による窒素酸化物の除去を
行う。Next, the nitrogen oxide removing method of this embodiment will be described in detail. The nitrogen oxide removing device of this embodiment has a bypass 19 for circulating the air in the device to the activated carbon filter 14 and a heater 21 for heating the activated carbon filter 14. Normally, when inhaling the air outside the device, the
(A), the damper 20 in the bypass is closed, the damper 17 on the intake port side and the damper 18 on the exhaust port side are open, and the nitrogen oxides are removed by the same method as in the first embodiment. When the nitrogen dioxide adsorption capacity of the activated carbon filter 14 is saturated, the ozone generation by the ozone generator 13 is stopped, and the intake port side damper 17 and the exhaust port side damper 18 are closed, as shown in FIG. Damper 2 in bypass
Release 0. As a result, the air in the device is bypassed 1
It circulates in 9 in the direction of the arrow. At this time, it was designed so that the air inside the device did not leak to the outside of the removal device. In this state, the heater 2 installed near the activated carbon filter 14
1, the activated carbon filter 14 is heated. By heating, a part of the carbon dioxide adsorbed on the activated carbon filter 14 reacts with the activated carbon filter 14 and oxygen in the air to be converted into nitrogen. Further, the nitrogen oxides desorbed from the activated carbon filter 14 in the state of nitrogen dioxide or reduced to nitric oxide are circulated to the heated activated carbon filter 14 again through the bypass 19 without being released to the outside of the apparatus. Therefore, most of it is eventually reduced to nitrogen. Thus, after the regeneration of the activated carbon filter 14 and the reduction of the nitrogen oxides are completed, the heating is stopped, and the nitrogen oxides are removed again by the ozone generator 13 and the activated carbon filter 14.
【００１３】この窒素酸化物除去装置を用い、実施例１
と同様の方法で窒素酸化物の浄化試験を行った。すなわ
ち、一酸化窒素と二酸化窒素をそれぞれ２．５ｐｐｍに
なるように注入した容積１ｍ3のアクリル樹脂製の立方
体の密閉容器内に除去装置を配し、オゾン発生器１３お
よびファン１６を３０分間運転させた。この時、バイパ
ス内ダンパ２０を閉鎖し、他のダンパ１７、１８を開放
することにより、吸入された空気がバイパス１９には流
れず、オゾン発生器１３を通過し、活性炭フィルタ１
４、オゾン分解触媒１５を通過した後、除去装置外に排
出されるようにした。この時、ヒータ２１の通電は行わ
なかった。この浄化を３０分間行った後、容器内の換気
を行い、一酸化窒素及び二酸化窒素を注入し、同様の試
験を繰り返した。Using this nitrogen oxide removing apparatus, Example 1
A nitrogen oxide purification test was conducted in the same manner as in (1). That is, the removal device is placed in a cubic closed container made of acrylic resin having a volume of 1 m 3 into which nitric oxide and nitrogen dioxide are injected so as to be 2.5 ppm, respectively, and the ozone generator 13 and the fan 16 are operated for 30 minutes. Let At this time, by closing the damper 20 in the bypass and opening the other dampers 17 and 18, the sucked air does not flow into the bypass 19 and passes through the ozone generator 13, and the activated carbon filter 1
4. After passing through the ozone decomposition catalyst 15, it was discharged to the outside of the removing device. At this time, the heater 21 was not energized. After performing this purification for 30 minutes, the container was ventilated, nitric oxide and nitrogen dioxide were injected, and the same test was repeated.
【００１４】浄化開始３０分後の容器内における空気中
の窒素酸化物濃度が４ｐｐｍを超え、活性炭フィルタ１
４の劣化が進んだ時点で、上記方法により活性炭フィル
タ１４の再生を行った。再生終了後、ヒータ２１の通電
を停止し、活性炭フィルタ１４を冷却してから、バイパ
ス内ダンパ２０を閉鎖し、他のダンパ１７、１８を開放
し、再び先に述べた窒素酸化物浄化試験を行った。この
とき、浄化再開３０分後の窒素酸化物濃度は０．９ｐｐ
ｍであり、活性炭フィルタ１４の窒素酸化物吸着能力が
再生されていることが確認された。After 30 minutes from the start of purification, the concentration of nitrogen oxides in the air in the container exceeded 4 ppm, and activated carbon filter 1
When the deterioration of No. 4 progressed, the activated carbon filter 14 was regenerated by the above method. After the regeneration is completed, the energization of the heater 21 is stopped, the activated carbon filter 14 is cooled, the damper 20 in the bypass is closed, the other dampers 17 and 18 are opened, and the nitrogen oxide purification test described above is performed again. went. At this time, the nitrogen oxide concentration 30 minutes after the restart of purification is 0.9 pp
m, and it was confirmed that the nitrogen oxide adsorption capacity of the activated carbon filter 14 was regenerated.
【００１５】なお、一般的には加熱された活性炭に窒素
酸化物を接触させれば、窒素酸化物を窒素に還元するこ
とも可能であるが、窒素への転化率はそれほど大きくな
らない。また消費電力も大きくなり、さらに加熱された
空気を装置外に常時排出することになるため、使用用途
に限界がある。これに比べ、本実施例の窒素酸化物の除
去方法では、効率的に窒素酸化物を浄化でき、活性炭フ
ィルタ１４の再生時にしか加熱を行わないため、夏季に
も空気清浄器として利用可能である。活性炭は、再生時
に窒素酸化物や酸素と反応して一部は消費されるため、
最終的には交換が必要であるが、これまでの使い捨ての
フィルタのように頻繁に交換する必要がなくなる。ま
た、加熱時間や加熱温度などを適切に設定することによ
りフィルタの使用期間を延ばすこともできる。Generally, it is possible to reduce nitrogen oxides to nitrogen by bringing heated oxides into contact with nitrogen oxides, but the conversion rate to nitrogen does not become so large. In addition, the power consumption becomes large and the heated air is constantly discharged to the outside of the apparatus, which limits its use. On the other hand, in the method for removing nitrogen oxides of the present embodiment, nitrogen oxides can be efficiently purified, and heating is performed only when the activated carbon filter 14 is regenerated, so that it can be used as an air purifier even in summer. . Activated carbon reacts with nitrogen oxides and oxygen during regeneration and is partially consumed,
Eventually, replacement is necessary, but it is not necessary to replace it as frequently as the conventional disposable filters. In addition, it is possible to extend the use period of the filter by appropriately setting the heating time, the heating temperature and the like.
【００１６】[0016]
【発明の効果】本発明によると、簡単な再生操作で、長
期にわたり高い浄化能力を維持する窒素酸化物の除去が
可能となる。According to the present invention, it is possible to remove nitrogen oxides that maintain a high purification capacity for a long period of time by a simple regeneration operation.
【図１】本発明の、一実施例に用いた窒素酸化物除去装
置の縦断面図である。FIG. 1 is a vertical cross-sectional view of a nitrogen oxide removing device used in an embodiment of the present invention.
【図２】同除去装置で用いた活性炭フィルタの斜視図で
ある。FIG. 2 is a perspective view of an activated carbon filter used in the removing apparatus.
【図３】本発明の、他の実施例に用いた窒素酸化物除去
装置の縦断面図であり、（ａ）は浄化時、（ｂ）は活性
炭フィルタの再生時を示す。FIG. 3 is a vertical cross-sectional view of a nitrogen oxide removing device used in another embodiment of the present invention, (a) showing purification and (b) showing regeneration of an activated carbon filter.
１ 外枠 １ａ 切り欠き部 ３ オゾン発生器 ４ 活性炭フィルタ ５ オゾン分解触媒 ６ ファン ７ フィルタケース ８ 金網 １１ 外枠 １３ オゾン発生器 １４ 活性炭フィルタ １５ オゾン分解触媒 １６ ファン １７ 吸気口側ダンパ １８ 排気口側ダンパ １９ バイパス ２０ バイパス内ダンパ ２１ ヒータ 1 Outer Frame 1a Notch 3 Ozone Generator 4 Activated Carbon Filter 5 Ozone Decomposition Catalyst 6 Fan 7 Filter Case 8 Wire Mesh 11 Outer Frame 13 Ozone Generator 14 Activated Carbon Filter 15 Ozone Decomposition Catalyst 16 Fan 17 Intake Side Damper 18 Exhaust Side Damper 19 Bypass 20 In-bypass damper 21 Heater
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０１Ｂ 21/36 (72)発明者 藤井 康浩 大阪府門真市大字門真1006番地 松下電器 産業株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI Technical display location C01B 21/36 (72) Inventor Yasuhiro Fujii 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (3)
程と、オゾン発生器からオゾンを放出させ、前記空気中
の一酸化窒素を二酸化窒素に酸化する工程と、前記空気
中の二酸化窒素を活性炭フィルタに吸着させ除去する工
程と、吸着能力の低下した前記活性炭フィルタを水洗、
乾燥することにより前記活性炭フィルタに吸着した窒素
酸化物を除去し、前記活性炭フィルタを再生させる工程
を含む窒素酸化物の除去方法。1. A step of inhaling external air containing nitrogen oxides, a step of releasing ozone from an ozone generator to oxidize nitric oxide in the air into nitrogen dioxide, and a step of removing nitrogen dioxide in the air. A step of adsorbing and removing the activated carbon filter, and washing the activated carbon filter with reduced adsorption capacity with water,
A method for removing nitrogen oxides, which comprises a step of removing nitrogen oxides adsorbed on the activated carbon filter by drying and regenerating the activated carbon filter.
程と、オゾン発生器からオゾンを放出させ、前記空気中
の一酸化窒素を二酸化窒素に酸化する工程と、前記空気
中の二酸化窒素を活性炭フィルタにより吸着除去する工
程と、前記オゾン発生器を停止し、かつ外部との空気の
流通を遮断するとともに、内部に残留した空気を前記活
性炭フィルタを通過するように循環させ、さらに前記活
性炭フィルタを加熱することにより前記活性炭フィルタ
を再生させる工程を含む窒素酸化物の除去方法。2. A step of inhaling external air containing nitrogen oxides, a step of releasing ozone from an ozone generator to oxidize nitric oxide in the air to nitrogen dioxide, and a step of removing nitrogen dioxide in the air. A step of adsorbing and removing with an activated carbon filter, stopping the ozone generator, and blocking the flow of air with the outside, and circulating the air remaining inside to pass through the activated carbon filter, and further with the activated carbon filter. A method for removing nitrogen oxides, which comprises a step of regenerating the activated carbon filter by heating the nitrogen oxide.
と、前記オゾン発生器の下流に配された活性炭フィルタ
と、前記活性炭フィルタ近傍に設置された前記活性炭フ
ィルタを加熱する加熱装置と、前記オゾン発生器の下流
に配された外部空気を吸入するファンと、前記活性炭フ
ィルタ、前記加熱装置および前記ファンを挟んだ上流側
と下流側を結ぶバイパスと、前記バイパスを開閉するバ
イパス内ダンパと、前記オゾン発生器と前記バイパスの
上流側開口部の間に配された吸気口側ダンパと、前記バ
イパスの下流側開口部の下流に配された排気口側ダンパ
を具備する窒素酸化物除去装置。3. An ozone generator disposed on the intake side of the device, an activated carbon filter disposed downstream of the ozone generator, and a heating device for heating the activated carbon filter installed near the activated carbon filter. A bypass for connecting the upstream side and the downstream side sandwiching the activated carbon filter, the heating device and the fan, and a damper inside the bypass for opening and closing the bypass, And a nitrogen oxide removal device including an intake-side damper disposed between the ozone generator and the upstream opening of the bypass, and an exhaust-side damper disposed downstream of the downstream opening of the bypass. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7315587A JPH09155152A (en) | 1995-12-04 | 1995-12-04 | Method and device for removal of nitrogen oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7315587A JPH09155152A (en) | 1995-12-04 | 1995-12-04 | Method and device for removal of nitrogen oxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09155152A true JPH09155152A (en) | 1997-06-17 |
Family
ID=18067157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7315587A Pending JPH09155152A (en) | 1995-12-04 | 1995-12-04 | Method and device for removal of nitrogen oxide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09155152A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327635A (en) * | 1999-05-17 | 2000-11-28 | Daicel Chem Ind Ltd | Production of nitro compound and removal of nitrogen dioxide |
| JP2005349107A (en) * | 2004-06-14 | 2005-12-22 | Midori Anzen Co Ltd | Harmful gas remover |
| JP2006032078A (en) * | 2004-07-15 | 2006-02-02 | Matsushita Electric Ind Co Ltd | Fuel cell generator |
| US7150778B1 (en) * | 2004-04-26 | 2006-12-19 | The United States Of America As Represented By The Secretary Of The Army | Recirculation jacket filter system |
| JP2007069187A (en) * | 2005-09-09 | 2007-03-22 | Environmental Restoration & Conservation Agency | Nitrogen oxide removal system |
| JP2008036466A (en) * | 2006-08-01 | 2008-02-21 | Daikin Ind Ltd | Air cleaner |
| JP2009095801A (en) * | 2007-10-18 | 2009-05-07 | Toshiba Corp | NOx PURIFYING APPARATUS IN NORMAL-TEMPERATURE GAS |
| CN108939916A (en) * | 2018-09-29 | 2018-12-07 | 国电环境保护研究院 | A kind of system carrying out SCR efficient denitration using ozone |
-
1995
- 1995-12-04 JP JP7315587A patent/JPH09155152A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000327635A (en) * | 1999-05-17 | 2000-11-28 | Daicel Chem Ind Ltd | Production of nitro compound and removal of nitrogen dioxide |
| US7150778B1 (en) * | 2004-04-26 | 2006-12-19 | The United States Of America As Represented By The Secretary Of The Army | Recirculation jacket filter system |
| JP2005349107A (en) * | 2004-06-14 | 2005-12-22 | Midori Anzen Co Ltd | Harmful gas remover |
| JP2006032078A (en) * | 2004-07-15 | 2006-02-02 | Matsushita Electric Ind Co Ltd | Fuel cell generator |
| JP2007069187A (en) * | 2005-09-09 | 2007-03-22 | Environmental Restoration & Conservation Agency | Nitrogen oxide removal system |
| JP2008036466A (en) * | 2006-08-01 | 2008-02-21 | Daikin Ind Ltd | Air cleaner |
| JP2009095801A (en) * | 2007-10-18 | 2009-05-07 | Toshiba Corp | NOx PURIFYING APPARATUS IN NORMAL-TEMPERATURE GAS |
| CN108939916A (en) * | 2018-09-29 | 2018-12-07 | 国电环境保护研究院 | A kind of system carrying out SCR efficient denitration using ozone |
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