JPH11235517A - Gas purification equipment - Google Patents
Gas purification equipmentInfo
- Publication number
- JPH11235517A JPH11235517A JP10039994A JP3999498A JPH11235517A JP H11235517 A JPH11235517 A JP H11235517A JP 10039994 A JP10039994 A JP 10039994A JP 3999498 A JP3999498 A JP 3999498A JP H11235517 A JPH11235517 A JP H11235517A
- Authority
- JP
- Japan
- Prior art keywords
- absorption
- absorbing
- gas
- liquid
- performance
- 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)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
(57)【要約】
【課題】湿式吸収法とバイオ処理を合わせたシステムに
おいて、吸収液にかかる薬剤の使用量の低減、すなわち
薬剤コストの低減が問題点となっていた。
【解決手段】本発明では吸収液溜めに脱窒菌を培養する
ことにより、ＮＯあるいはＮＯ2 を吸収した吸収液を脱
窒菌の脱窒作用によって硝酸イオン，亜硝酸イオンを窒
素に変換する。この脱窒作用を吸収液溜めで行うことに
より、吸収液溜め中の吸収液の性能劣化をもたらす、亜
硝酸イオン，硝酸イオン濃度が低減し吸収液の性能向
上、及び寿命の長寿化を図ることができる。
(57) [Summary] [PROBLEMS] In a system combining a wet absorption method and a biotreatment, reduction of the amount of a drug used in an absorbing solution, that is, reduction of a drug cost has been a problem. According to the present invention, nitric ions and nitrite ions are converted into nitrogen by denitrifying the desorbing solution absorbing NO or NO 2 by denitrifying bacteria by culturing denitrifying bacteria in the absorbing solution reservoir. By performing this denitrification action in the absorption liquid reservoir, the performance of the absorption liquid in the absorption liquid reservoir is degraded, the concentration of nitrite and nitrate ions is reduced, and the performance of the absorption liquid is improved and the service life is prolonged. Can be.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車トンネル，
交差点，屋内駐車場，高速道路等で、煤塵、及び低濃度
のＮＯｘを含むガスが集中する場所において、主にガス
中のＮＯｘ，煤塵除去を目的に用いられるガス浄化装置
に関するものである。TECHNICAL FIELD The present invention relates to an automobile tunnel,
The present invention relates to a gas purification device mainly used for removing NOx and dust in a gas at a place where dust and gas containing low concentration NOx are concentrated at an intersection, an indoor parking lot, a highway, and the like.
【０００２】[0002]
【従来の技術】近年、交通量の増加に伴い、自動車トン
ネル，交差点，屋内駐車場，高速道路等の特に交通量の
頻繁な場所、すなわち自動車の排気ガスの濃度の高くな
る場所において、ガス中の煤塵，ＮＯｘの処理が問題と
なっている。従来、自動車トンネル等においては、送風
機を用いてトンネル内部のガスをトンネル外に排出す
る、あるいは付帯設備として電気除塵機を用いて、煤塵
を取り除くという方法がとられていた。2. Description of the Related Art In recent years, with the increase in traffic, in places such as automobile tunnels, intersections, indoor parking lots, and highways where traffic is particularly frequent, that is, places where the concentration of exhaust gas from automobiles is high, gas emissions are low. The treatment of dust and NOx is problematic. 2. Description of the Related Art Conventionally, in a car tunnel or the like, a method has been adopted in which gas inside the tunnel is discharged to the outside of the tunnel using a blower, or dust is removed using an electric dust remover as an incidental facility.
【０００３】しかしながら、環境問題に対する意識の高
まりにより、自動車トンネル等の低濃度のＮＯｘに対し
て、対策の必要性が生じている。低濃度の脱硝技術に対
する公知例としては、特開平5−192535号公報，特開平4
−250822号公報が存在する。両公知例とともに、吸着剤
にＮＯｘを吸着させ、吸着したＮＯｘを脱離して還元剤
により窒素と水に還元することによってガスの浄化を行
うというシステムである。[0003] However, with increasing awareness of environmental issues, there is a need to take measures against low-concentration NOx in automobile tunnels and the like. Known examples of the low-density denitration technology include JP-A-5-192535 and JP-A-4-192535.
-250822. Along with both known examples, this is a system in which gas is purified by adsorbing NOx on an adsorbent, desorbing the adsorbed NOx and reducing it to nitrogen and water by a reducing agent.
【０００４】これらのシステムは、吸着剤が複数にモジ
ュール化されており、大半のモジュールは吸着剤にＮＯ
ｘを吸着させるモジュールとなっており、一部のモジュ
ールはＮＯｘの吸着量が所定の値に増したところで吸着
したＮＯｘを脱離して、高濃度に濃縮したＮＯｘを形成
し、その高濃度のＮＯｘを、還元触媒を用いて選択接触
還元により窒素と水に還元するモジュールになってい
る。[0004] In these systems, a plurality of adsorbents are modularized, and most of the modules contain NO as adsorbent.
Some of the modules desorb the adsorbed NOx when the adsorbed amount of NOx increases to a predetermined value to form highly concentrated NOx, and the high-concentration NOx Is reduced to nitrogen and water by selective catalytic reduction using a reduction catalyst.
【０００５】吸着を行っているモジュールは吸着剤のＮ
Ｏｘ吸着量が所定値に達したところで還元を行うモジュ
ールに切り替えられ、また還元の終了したモジュール
は、吸着を行うモジュールに切り替えられ、これらが順
に連続的に行われることによって吸着剤のＮＯｘ吸着，
再生を連続的に行うことを可能としている。[0005] The module performing the adsorption is the adsorbent N
When the Ox adsorption amount reaches a predetermined value, the module is switched to a module that performs reduction, and the module that has completed the reduction is switched to a module that performs adsorption.
Reproduction can be performed continuously.
【０００６】[0006]
【発明が解決しようとする課題】従来の方法では、吸着
剤の脱離に要するエネルギが非常に大きい等のエネルギ
の低減の問題があった。この問題を解決するために、消
費エネルギの低減を実現する装置として、特願平7−294
512号出願（参照），特願平8−155189号出願（参照），
特願平8−261603号出願(参照）を出願した。これは、生
物の窒素固定化作用あるいは脱窒作用を利用することに
より、吸着剤等にかかるイニシャルコスト、あるいは吸
着剤の再生に必要な熱源等のランニングコストをなくす
ことにより、システム全体のエネルギ及びコストの低減
を図ったものである。In the conventional method, there is a problem in that the energy required for desorbing the adsorbent is extremely large, for example. To solve this problem, Japanese Patent Application No. 7-294 discloses an apparatus for reducing energy consumption.
No. 512 application (see), Japanese Patent Application No. 8-155189 (see),
We filed an application for Japanese Patent Application No. 8-261603 (see Reference). This is because the use of the nitrogen fixation or denitrification of living organisms eliminates the initial cost of the adsorbent or the running cost of the heat source required for the regeneration of the adsorbent, thereby reducing the energy and energy of the entire system. The cost is reduced.
【０００７】しかしながら、吸収液にかかる薬剤の使用
量の低減、すなわち薬剤コストの低減が問題点となって
いる。この問題の解決法として、特願平9−296692 号出
願（参照）を出願した。これは、吸収反応部を前段と後
段に分け、後段はフレッシュな吸収液で所定性能を満た
す吸収を行い、前段では、後段で使用済み、即ち所定性
能を維持できなくなった吸収液で予備吸収を行う。この
前段と後段の吸収を行うことにより、後段に係るＮＯｘ
の濃度負荷を軽減し、後段の吸収液の寿命をのばすとい
うものであった。However, there is a problem in reducing the amount of drug used in the absorbing solution, that is, reducing the drug cost. As a solution to this problem, we filed an application for Japanese Patent Application No. 9-296692 (reference). This is because the absorption reaction section is divided into the former stage and the latter stage, the latter stage performs absorption satisfying the predetermined performance with a fresh absorbing solution, and the former stage uses the used solution in the latter stage, that is, the preliminary absorption with the absorbing solution that can no longer maintain the predetermined performance. Do. By performing the absorption in the former stage and the latter stage, the NOx in the latter stage is absorbed.
This reduces the concentration load of the solution and prolongs the life of the absorbing solution in the latter stage.
【０００８】しかしながら、出願した特許の吸収プロセ
スの構造では、排ガスとの純粋な吸収反応を外れた、外
部気体との接触から生じる二次的な吸収反応により、無
駄な吸収が行われ、吸収液の劣化が促進されているとい
う問題点がある。[0008] However, in the structure of the absorption process of the patent filed, useless absorption is performed by the secondary absorption reaction that comes out of the contact with the external gas, which is out of the pure absorption reaction with the exhaust gas, and the absorption liquid is absorbed. There is a problem that the deterioration of is accelerated.
【０００９】本発明の目的は、従来出願した特許に加え
て、更に薬剤使用量を低減すべく、前述の問題点を解決
する吸収プロセスの構造を提供するとともに、それによ
って吸収に必要な薬剤使用量を低減し、システム全体と
してのランニングコストが低減できるガス浄化装置を提
供する。It is an object of the present invention to provide a structure of an absorption process which solves the above-mentioned problems in order to further reduce the amount of drug used, in addition to the patents filed in the prior art, and thereby provide the structure of the drug required for absorption. Provided is a gas purifying apparatus capable of reducing the amount and running cost of the entire system.
【００１０】[0010]
【課題を解決するための手段】本発明のガス浄化装置
は、以降に示す３つの方法を適用することにより、吸収
剤の性能の劣化を緩和している。The gas purifying apparatus of the present invention reduces the deterioration of the performance of the absorbent by applying the following three methods.
【００１１】(1).従来方法では脱窒プロセスを、吸収プ
ロセスの後に別処理として行っていたのに対し、本発明
では吸収液溜めに脱窒菌を培養することにより、ＮＯあ
るいはＮＯ2 を吸収した吸収液を脱窒菌の脱窒作用によ
って硝酸イオン，亜硝酸イオンを窒素に変換する。この
脱窒作用を吸収液溜めで行うことにより、吸収液溜め中
の吸収液の性能劣化をもたらす、亜硝酸イオン，硝酸イ
オン濃度が低減し吸収液の性能向上、及び寿命の長寿化
を図ることができる。(1) In the conventional method, the denitrification process is performed as a separate treatment after the absorption process. On the other hand, in the present invention, NO or NO 2 is absorbed by culturing denitrification bacteria in the absorption solution reservoir. The absorbed liquid is converted into nitrate ions and nitrite ions into nitrogen by the denitrifying action of the denitrifying bacteria. By performing this denitrification action in the absorption liquid reservoir, the performance of the absorption liquid in the absorption liquid reservoir is degraded, the concentration of nitrite and nitrate ions is reduced, and the performance of the absorption liquid is improved and the service life is prolonged. Can be.
【００１２】(2).従来、吸収液散布後の吸収液溜めに貯
蓄される吸収液が、排気ガス等の外部気体にさらされる
ことにより、吸収液の劣化が促進されていたのを解決す
るために、吸収部と吸収液溜めとの間のＳ字間を設け、
かつ吸収液溜めを密閉構造とすることにより、Ｓ字間に
吸収液がたまることにより、吸収液溜め中の吸収液が外
部気体との接触を絶つことによって吸収液溜めの吸収液
の劣化が促進することを防止している。(2) Conventionally, the absorption liquid stored in the absorption liquid reservoir after the absorption liquid is sprayed is exposed to an external gas such as exhaust gas, so that the deterioration of the absorption liquid is promoted. For this purpose, an S-shaped space is provided between the absorbing section and the absorbing liquid reservoir,
In addition, since the absorbing liquid reservoir has a closed structure, the absorbing liquid accumulates between the S-shaped portions, so that the absorbing liquid in the absorbing liquid reservoir stops contact with an external gas, thereby promoting the deterioration of the absorbing liquid in the absorbing liquid reservoir. To prevent them from doing so.
【００１３】(3).密閉構造の吸収液溜め中の脱窒菌の脱
窒作用により、吸収液溜め中に窒素が充満することによ
り、吸収液溜め中に混入した外部気体の濃度の希釈を行
い、吸収液溜め中の吸収液の劣化を緩和している。(3) The concentration of the external gas mixed into the absorption liquid reservoir is reduced by filling the absorption liquid reservoir with nitrogen by the denitrifying action of the denitrifying bacteria in the closed absorption liquid reservoir. In addition, the deterioration of the absorbing liquid in the absorbing liquid reservoir is reduced.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施例を図面を用
いて説明する。図１は本発明を最もよく表すガス浄化装
置の図である。排ガス１は煤塵、ＮＯｘを含むガスであ
り、ブロワ２によりガス入口３より装置に導かれる。排
ガス１はＮＯｘ酸化手段５によりガス中のＮＯｘの一部
または全部がＮＯ2 に酸化される。ＮＯｘ酸化手段５は
オゾンを添加する方法でもかまわないし、あるいは放電
による酸化を用いてもかまわない。酸化されたＮＯ2 含
有ガス及び煤塵は、除塵手段６にて、ガス中の煤塵が除
去される。この除塵手段６は湿式、あるいは乾式の電気
集塵機を用いてもかまわないし、あるいはフィルターを
用いる手段でもかまわない。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram of a gas purification device that best illustrates the present invention. The exhaust gas 1 is a gas containing dust and NOx, and is led to the device from the gas inlet 3 by the blower 2. Exhaust gas 1 is partially or entirely oxidized to NO 2 by NOx oxidizing means 5. The NOx oxidizing means 5 may be a method of adding ozone, or may be oxidizing by discharge. The oxidized NO 2 -containing gas and dust are removed by dust removing means 6 in the gas. The dust removing means 6 may use a wet or dry electric precipitator, or may use a filter.
【００１５】除塵を行った後のガスは、吸収部７に送り
込まれる。吸収部７は、送り込まれたガス中のＮＯ2 、
あるいはＮＯを吸収液に吸収するための機構である。吸
収部７の内部で、送り込まれたガスと吸収液を気液接触
させ、吸収反応を生じさせる。吸収液の性質は中性のも
のでもかまわないし、苛性ソーダ，亜硫酸ナトリウム，
チオ硫酸ナトリウム等のアルカリ性のものを用いてもか
まわない。The gas after dust removal is sent to the absorbing section 7. The absorption unit 7 is provided with NO 2 in the fed gas,
Alternatively, it is a mechanism for absorbing NO into the absorbing liquid. Inside the absorption section 7, the supplied gas and the absorption liquid are brought into gas-liquid contact to cause an absorption reaction. The properties of the absorbing solution may be neutral, such as caustic soda, sodium sulfite,
An alkaline substance such as sodium thiosulfate may be used.
【００１６】通常、このような吸収液に対しては、ＮＯ
よりもＮＯ2 の方が吸収しやすい。従って、前述のＮＯ
ｘ酸化手段５によるＮＯｘのＮＯ2 への酸化は、吸収性
能を高めるために行う操作であるが、吸収液の吸収性能
が優れており、ＮＯ2 に酸化しなくても十分ＮＯのまま
吸収が可能の場合には、ＮＯｘ酸化手段５は省略しても
よい。吸収部７には、気液接触による吸収性能促進のた
めに、充填物２５を充填する。Usually, NO is used for such an absorbing solution.
NO 2 is easier to absorb than NO 2 . Therefore, the aforementioned NO
The oxidation of NOx to NO 2 by the x oxidizing means 5 is an operation performed to enhance the absorption performance. However, the absorption performance of the absorbing solution is excellent, and the absorption can be performed with sufficient NO without oxidizing to NO 2. If possible, the NOx oxidizing means 5 may be omitted. The absorbing part 7 is filled with a filler 25 to promote absorption performance by gas-liquid contact.
【００１７】充填物２５はラシヒリング，サドル、ある
いはハニカム等、できるだけ接触面積が大きなものが好
ましい。また充填物を用いる以外にスプレー方式を用い
た吸収方式、あるいは濡れ壁を用いた吸収方式でもかま
わない。あるいはそれらの吸収方式を組合せた複合的な
方式を用いてもかまわない。The filler 25 preferably has a contact area as large as possible, such as Raschig ring, saddle or honeycomb. In addition to the use of the filler, an absorption method using a spray method or an absorption method using a wet wall may be used. Alternatively, a composite system combining those absorption systems may be used.
【００１８】吸収液は吸収液溜め９に貯留されており、
循環ポンプ１１により充填物２５に散布される。吸収液
は気液接触による吸収反応を行いつつ吸収液溜め９に貯
留される。吸収液の散布の仕方は連続的に行っても間欠
的に行ってもかまわない、但し、間欠的に散布を行う場
合には、所定の性能を維持できるように、散布のサイク
ルの制御を行う。The absorbing liquid is stored in an absorbing liquid reservoir 9,
It is sprayed on the filler 25 by the circulation pump 11. The absorbing liquid is stored in the absorbing liquid reservoir 9 while performing an absorbing reaction by gas-liquid contact. The method of spraying the absorbing liquid may be continuous or intermittent. However, in the case of intermittent spraying, the spraying cycle is controlled so as to maintain a predetermined performance. .
【００１９】本発明では、吸収部７と吸収液溜め９の間
をＳ字管８で配管を行う。このＳ字管８は吸収液溜め９
の吸収液が、吸収部７を流れる排ガスと接触することに
より、性能が劣化するのを防ぐために設けるものであ
る。充填物２５を流下した吸収液はＳ字管８を通過して
吸収液溜め９に導かれるが、このＳ字管８に吸収液がた
まることにより、吸収部７の気体は吸収液溜め９から遮
断され、吸収液溜め９の吸収液が外部気体と接触するこ
とを防ぎ、吸収液の劣化が緩和される。吸収液溜め９の
吸収液は循環ポンプ１１により連続的に散布が行われ、
常に吸収反応が持続される。吸収液は吸収を続けるとと
もに性能が劣化する。In the present invention, piping between the absorbing section 7 and the absorbing liquid reservoir 9 is provided by an S-shaped pipe 8. This S-shaped tube 8 has an absorption liquid reservoir 9.
Is provided to prevent the performance of the absorbent from deteriorating due to the contact of the absorbing liquid with the exhaust gas flowing through the absorbing section 7. The absorbing liquid flowing down the filling 25 passes through the S-shaped pipe 8 and is guided to the absorbing liquid reservoir 9. When the absorbing liquid accumulates in the S-shaped pipe 8, the gas in the absorbing section 7 is discharged from the absorbing liquid reservoir 9. The absorption is prevented, and the absorption liquid in the absorption liquid reservoir 9 is prevented from coming into contact with an external gas, so that the deterioration of the absorption liquid is reduced. The absorption liquid in the absorption liquid reservoir 9 is continuously sprayed by the circulation pump 11,
The absorption reaction is always maintained. The absorbing liquid continues to absorb and its performance deteriorates.
【００２０】この吸収性能の劣化を防止するために、吸
収液添加手段１０により、新たな吸収液を補充し吸収性
能を維持する。この吸収液の補充は、性能を常に一定の
値に保つように連続的に添加を行う。あるいは、性能の
低下が非常に遅い場合は間欠的に行う。添加量は吸収部
７における水分の蒸発量に相当する液量にて行うように
し、吸収液溜め９の水量が常に一定にたもたれるように
行う。In order to prevent the deterioration of the absorption performance, new absorption liquid is replenished by the absorption liquid adding means 10 to maintain the absorption performance. The replenishment of the absorbing solution is performed continuously so as to keep the performance at a constant value. Alternatively, if the performance degradation is very slow, it is performed intermittently. The amount of addition is adjusted so as to correspond to the amount of evaporation of the water in the absorbing section 7, and the amount of water in the absorbing liquid reservoir 9 is always kept constant.
【００２１】このとき補充される液は、吸収部７での吸
収性能が維持できるような濃度で行う必要があり、この
濃度制御は、吸収液添加手段１０を予め高濃度、あるい
は粉末状の濃度の高いものにしておき、水の希釈で濃度
制御を行うようにする。煤塵，ＮＯ，ＮＯ2 が除去され
たガスは、ミストエリミネータ１２でガス中に含まれる
ミストを除去した後、ガス出口１３から浄化ガス１４と
して大気に放出される。At this time, the liquid to be replenished must be at a concentration that can maintain the absorption performance in the absorption section 7. This concentration control is performed by setting the absorption liquid adding means 10 to a high concentration or a powdery concentration in advance. And control the concentration by diluting the water. The gas from which dust, NO, and NO 2 have been removed is discharged to the atmosphere as a purified gas 14 from a gas outlet 13 after removing mist contained in the gas by a mist eliminator 12.
【００２２】本発明では、吸収液溜め９の中に脱窒菌２
４が培養されている。脱窒菌は硫黄酸化菌を用いる。吸
収液溜め９中の吸収液には、排ガス１で吸収したＮＯあ
るいはＮＯ2 がイオン化しており亜硝酸イオン，硝酸イ
オンの形態で存在する。脱窒菌２４はこれらの亜硝酸イ
オン，硝酸イオンを餌として、脱窒反応を生じ、窒素を
発生する。According to the present invention, the denitrifying bacteria 2
4 have been cultured. Denitrifying bacteria use sulfur oxidizing bacteria. In the absorbing solution in the absorbing solution reservoir 9, NO or NO 2 absorbed by the exhaust gas 1 is ionized and exists in the form of nitrite ions and nitrate ions. The denitrifying bacterium 24 uses these nitrite ions and nitrate ions as feed to cause a denitrification reaction to generate nitrogen.
【００２３】この脱窒作用により、排水における規制対
象となる、吸収液中にとりこんだ硝酸イオン，亜硝酸イ
オン等の硝酸性窒素の浄化が行われ、吸収液の無害化が
行われる。又、吸収液の性能は、吸収液中の亜硝酸イオ
ン，硝酸イオン濃度に深く関与しており、この濃度が高
まると性能が低下する。[0023] By this denitrification, nitrate nitrogen such as nitrate ions and nitrite ions taken into the absorbing solution, which is a target of regulation in wastewater, is purified, and the absorbing solution is rendered harmless. In addition, the performance of the absorbing solution is deeply related to the concentration of nitrite ions and nitrate ions in the absorbing solution, and the higher the concentration, the lower the performance.
【００２４】本発明では、脱窒菌２４の脱窒作用によ
り、吸収液中の亜硝酸イオン，硝酸イオンが窒素に変換
されるので、これらのイオンの濃度は常に低い値に維持
されるので、吸収液の性能の劣化が緩和される。また、
脱窒菌２４の脱窒作用により生じた窒素が吸収液溜め９
に充満することにより、吸収液溜め９に混入した、吸収
液の劣化を招く外部気体の濃度が希釈され、吸収液の劣
化が緩和される。以上が本発明による、吸収液の性能、
及び、寿命の向上に係る特徴である。In the present invention, since the nitrite and nitrate ions in the absorbing solution are converted into nitrogen by the denitrifying action of the denitrifying bacteria 24, the concentration of these ions is always maintained at a low value. Deterioration of liquid performance is reduced. Also,
Nitrogen generated by the denitrifying action of the denitrifying bacteria 24
, The concentration of the external gas mixed into the absorption liquid reservoir 9 and causing the deterioration of the absorption liquid is diluted, and the deterioration of the absorption liquid is reduced. Above is the performance of the absorbent according to the present invention,
And it is a feature related to the improvement of the life.
【００２５】脱窒菌２４の培養は、その性能を高めるた
めに、担体に付着させ、脱窒菌の培養濃度を高めること
が好ましい。あるいは、脱窒菌を包括固定の手段を用い
て、培養密度を高める方法を用いてもかまわない。付着
させる担体はサドル，ラシヒリング等の充填剤でもかま
わないし、ハニカムあるいはそれに類似の多孔質構造の
ものを用いてもかまわない。またウレタン等の繊維質の
ものを用いてもかまわない。担体付着を行わなくても性
能が十分の場合にはこの操作は行わなくてもよい。In order to enhance the performance of the culture of the denitrifying bacterium 24, it is preferable to attach it to a carrier to increase the culture concentration of the denitrifying bacterium. Alternatively, a method of increasing the culture density by using a means for comprehensively fixing the denitrifying bacteria may be used. The carrier to be attached may be a filler such as a saddle or a Raschig ring, or may be a honeycomb or a porous structure similar thereto. Further, a fibrous material such as urethane may be used. This operation need not be performed when the performance is sufficient without performing the carrier adhesion.
【００２６】吸収液溜め９の吸収液は、吸収液の補給に
より蓄積される脱窒菌２４の脱窒活性に影響を与える特
定のイオン量が脱窒菌２４に阻害を与える規定値になっ
た時点で、全液量が貯水槽２１に送られる。脱窒菌２４
は脱窒を繰り返すうちに微量ではあるが、増殖を行う。
増殖の結果余剰となった脱窒菌２４、あるいは老廃した
脱窒菌２４並びに、吸収液中に含まれる煤塵等の不要物
は、固液分離手段２５により固形分２０が溶液から分離
される。固形分２０は貯蔵後処理され、不要溶液は排液
２２として装置外へ排出される。The absorption liquid in the absorption liquid reservoir 9 is used when a specific amount of ions, which affects the denitrifying activity of the denitrifying bacteria 24 accumulated by the replenishment of the absorbing liquid, reaches a specified value that inhibits the denitrifying bacteria 24. , The entire liquid volume is sent to the water storage tank 21. Denitrifying bacteria 24
Grows in small amounts during repeated denitrification.
The solids 20 are separated from the solution by the solid-liquid separation means 25 from the denitrifying bacteria 24 which became excessive as a result of the proliferation, or the denitrifying bacteria 24 which have become obsolete, and dust and the like contained in the absorbing solution. The solid content 20 is treated after storage, and the unnecessary solution is discharged out of the apparatus as a drainage liquid 22.
【００２７】用水使用量の低減が必要の場合には、用水
のリサイクルを図るために固液分離手段２５により分離
された溶液の一部または全部を、ポンプ１９で貯水槽１
８に蓄える。貯水槽１８で蓄えられた溶液には、薬剤に
係るイオン等が含まれており、これは脱窒菌２４に阻害
を与えるので、リサイクルの再には除去の必要がある。
溶液は循環液再生手段１８で不要なイオン等の処理を行
う。If it is necessary to reduce the amount of water used, part or all of the solution separated by the solid-liquid separation means 25 for recycling the water is pumped by the pump 19 into the water tank 1.
Store in 8. The solution stored in the water storage tank 18 contains ions and the like related to the drug, which inhibits the denitrifying bacteria 24, and therefore needs to be removed before recycling.
The solution is subjected to treatment of unnecessary ions and the like by the circulating liquid regenerating means 18.
【００２８】イオンの処理には、電気透析による不要イ
オンの選択分離を用いてもかまわないし、薬品添加して
塩を生成して除去処理を行う手段を用いてもかまわな
い。前述の方法により生じた選択分離された不要イオ
ン、あるいは塩は、回収手段１７により回収され処理を
する。また、不要イオンを取り除いた液は、吸収液溜め
９に送られ再利用に用いられる。この用水の再循環を行
うことにより、吸収部７において必要な、水量の軽減が
計れ、ランニングコストの低減が可能となる。以上が本
発明を適用したガス浄化装置の一連の流れである。For the treatment of ions, selective separation of unnecessary ions by electrodialysis may be used, or a means for adding a chemical to generate a salt and performing a removal treatment may be used. The unnecessary ions or salts selectively separated and separated by the above-described method are collected and processed by the collecting means 17. The liquid from which the unnecessary ions have been removed is sent to the absorption liquid reservoir 9 and used for reuse. By performing this water recirculation, the amount of water required in the absorption section 7 can be reduced, and the running cost can be reduced. The above is a series of flows of the gas purification device to which the present invention is applied.
【００２９】[0029]
【発明の効果】本発明のガス浄化装置は、以降に示す３
つの方法を適用することにより、吸収剤の性能の劣化を
緩和している。The gas purifying apparatus of the present invention has the following three features.
By applying the two methods, deterioration of the performance of the absorbent is mitigated.
【００３０】(1).従来方法では脱窒プロセスを、吸収プ
ロセスの後に別処理として行っていたのに対し、本発明
では吸収液溜めに脱窒菌を培養することにより、ＮＯあ
るいはＮＯ2 を吸収した吸収液を脱窒菌の脱窒作用によ
って硝酸イオン，亜硝酸イオンを窒素に変換する。この
脱窒作用を吸収液溜めで行うことにより、吸収液溜め中
の吸収液の性能劣化をもたらす、亜硝酸イオン，硝酸イ
オン濃度が低減し吸収液の性能向上、及び寿命の長寿化
を図ることができる。(1) In the conventional method, the denitrification process is performed as a separate treatment after the absorption process. On the other hand, in the present invention, NO or NO 2 is absorbed by culturing denitrification bacteria in the absorption solution reservoir. The absorbed liquid is converted into nitrate ions and nitrite ions into nitrogen by the denitrifying action of the denitrifying bacteria. By performing this denitrification action in the absorption liquid reservoir, the performance of the absorption liquid in the absorption liquid reservoir is degraded, the concentration of nitrite and nitrate ions is reduced, and the performance of the absorption liquid is improved and the service life is prolonged. Can be.
【００３１】(2).従来、吸収液散布後の吸収液溜めに貯
蓄される吸収液が、排気ガス等の外部気体にさらされる
ことにより、吸収液の劣化が促進されていたのを解決す
るために、吸収部と吸収液溜めとの間のＳ字間を設け、
かつ吸収液溜めを密閉構造とすることにより、Ｓ字間に
吸収液がたまることにより、吸収液溜め中の吸収液が外
部気体との接触を絶つことによって吸収液溜めの吸収液
の劣化が促進することを防止している。(2) Conventionally, the absorption liquid stored in the absorption liquid reservoir after the absorption liquid is sprayed is exposed to an external gas such as an exhaust gas, so that the deterioration of the absorption liquid is promoted. For this purpose, an S-shaped space is provided between the absorbing section and the absorbing liquid reservoir,
In addition, since the absorbing liquid reservoir has a closed structure, the absorbing liquid accumulates between the S-shaped portions, so that the absorbing liquid in the absorbing liquid reservoir stops contact with an external gas, thereby promoting the deterioration of the absorbing liquid in the absorbing liquid reservoir. To prevent them from doing so.
【００３２】(3).密閉構造の吸収液溜め中の脱窒菌の脱
窒作用により、吸収液溜め中に窒素が充満することによ
り、吸収液溜め中に混入した外部気体の濃度の希釈を行
い、吸収液溜め中の吸収液の劣化を緩和している。(3) Due to the denitrifying action of the denitrifying bacteria in the absorption liquid reservoir having a closed structure, nitrogen is filled in the absorption liquid reservoir, thereby diluting the concentration of the external gas mixed into the absorption liquid reservoir. In addition, the deterioration of the absorbing liquid in the absorbing liquid reservoir is reduced.
【図１】本発明の実施例を最もよく表示したガス浄化装
置の構成図。FIG. 1 is a configuration diagram of a gas purification device in which an embodiment of the present invention is best illustrated.
１…排気ガス、２…ブロワ、３…ガス入口、５…ＮＯｘ
酸化手段、６…除塵手段、７…吸収部、８…Ｓ字管、９
…吸収液溜め、１０…吸収液添加手段、１１…循環ポン
プ、１２…ミストエリミネータ、１３…ガス出口、１４
…浄化ガス、１６…循環液再生手段、１７…回収手段、
１８，２１…貯水槽、１９…ポンプ、２０…固形分、２
２…排液、２４…脱窒菌、２５…固液分離手段。1: Exhaust gas, 2: Blower, 3: Gas inlet, 5: NOx
Oxidizing means, 6: dust removing means, 7: absorbing section, 8: S-shaped tube, 9
... Absorbent reservoir, 10 ... Absorbent adding means, 11 ... Circulation pump, 12 ... Mist eliminator, 13 ... Gas outlet, 14
... Purified gas, 16 ... Circulating liquid regeneration means, 17 ... Recovery means,
18, 21 ... water tank, 19 ... pump, 20 ... solid content, 2
2: drainage, 24: denitrifying bacteria, 25: solid-liquid separation means.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 難波 勝 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 (72)発明者 雪竹 次太 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 (72)発明者 横須賀 丈由 茨城県日立市大みか町七丁目１番１号 株 式会社日立製作所日立研究所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Namba 7-1-1, Omika-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Research Laboratory, Hitachi, Ltd. Hitachi 1-1, Hitachi, Ltd. (72) Inventor Takeyoshi Yokosuka 7-1-1, Omika-cho, Hitachi City, Ibaraki Pref., Hitachi Research Laboratory, Hitachi, Ltd.
Claims (1)
化することを目的とし、ガス中のＮＯｘの一部あるいは
全部を酸化手段によりＮＯ2 に酸化する酸化プロセス
と、ガス中の煤塵を除去する除塵プロセスと、酸化され
たＮＯ2 、あるいはＮＯ，ＮＯ2 を中性またはアルカリ
性の吸収液に吸収する吸収プロセスと、ＮＯ、あるいは
ＮＯ2 を吸収した吸収液中の硝酸イオン，亜硝酸イオン
を脱窒菌を用いて脱窒処理を行う脱窒プロセスを有し、
これらの一連のプロセスにて排気ガスの浄化を行うガス
浄化装置において、吸収プロセスにおける気液接触を行
う吸収部で散布した吸収液を溜める吸収液溜めの中に、
脱窒菌を培養し、脱窒菌の脱窒作用により、吸収されて
いる硝酸イオン，亜硝酸イオンを窒素に変換することに
より、規制対象となる硝酸イオン，亜硝酸イオンの無害
化を図るとともに、吸収液の性能劣化の原因となるこれ
らの硝酸イオン，亜硝酸イオン濃度を減少させることに
より吸収液の性能の向上及び寿命を伸ばすことを特徴と
するガス浄化装置。An object of the present invention is to purify a dust and a gas containing a low concentration of NOx, and to oxidize a part or all of the NOx in the gas to NO 2 by an oxidizing means. A dust removal process for removing, an absorption process for absorbing oxidized NO 2 or NO, NO 2 into a neutral or alkaline absorbing solution, and a nitrate ion, a nitrite ion in an absorbing solution absorbing NO or NO 2 Has a denitrification process of performing a denitrification treatment using denitrifying bacteria,
In a gas purification device that purifies exhaust gas in a series of these processes, in an absorption liquid reservoir that stores the absorption liquid sprayed in the absorption unit that performs gas-liquid contact in the absorption process,
By culturing the denitrifying bacteria and converting the absorbed nitrate and nitrite ions to nitrogen by the denitrifying action of the denitrifier, the nitrate and nitrite ions to be regulated are made harmless and absorbed. A gas purifying apparatus characterized in that the concentration of nitrate ions and nitrite ions, which cause deterioration in the performance of a liquid, is reduced to improve the performance of the absorbent and extend the life of the absorbent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10039994A JPH11235517A (en) | 1998-02-23 | 1998-02-23 | Gas purification equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10039994A JPH11235517A (en) | 1998-02-23 | 1998-02-23 | Gas purification equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11235517A true JPH11235517A (en) | 1999-08-31 |
Family
ID=12568492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10039994A Pending JPH11235517A (en) | 1998-02-23 | 1998-02-23 | Gas purification equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11235517A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989280A (en) * | 2012-11-19 | 2013-03-27 | 高玉宗 | Smoke purification method and smoke purification device |
-
1998
- 1998-02-23 JP JP10039994A patent/JPH11235517A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102989280A (en) * | 2012-11-19 | 2013-03-27 | 高玉宗 | Smoke purification method and smoke purification device |
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