JPH09276734A - Electrostatic precipitator - Google Patents
Electrostatic precipitatorInfo
- Publication number
- JPH09276734A JPH09276734A JP9079596A JP9079596A JPH09276734A JP H09276734 A JPH09276734 A JP H09276734A JP 9079596 A JP9079596 A JP 9079596A JP 9079596 A JP9079596 A JP 9079596A JP H09276734 A JPH09276734 A JP H09276734A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- electrostatic precipitator
- aqueous solution
- spraying
- dust collecting
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車道トンネル
内の空気中に含まれるばいじんを除去する自動車道トン
ネル用電気集塵装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric dust collector for a roadway tunnel for removing dust contained in the air in the roadway tunnel.
【０００２】[0002]
【従来の技術】特開昭53−84867 号公報に開示されるよ
うに、自動車通行量の頻繁な都市部の自動車道トンネル
はばいじんによる視界の低下を招くので、換気装置が設
けられている。換気方法として誘引ファンで新鮮な空気
を取り込み、トンネル内の汚染空気を大気へ排出する方
法が用いられるが、汚染空気を直接大気中へ放出する
と、排気塔付近の住環境がばいじんにより汚染されるの
で、排出する前に予めばいじんは除去する必要がある。2. Description of the Related Art As disclosed in Japanese Patent Laid-Open No. 53-84867, a ventilator is provided in a highway tunnel in an urban area where the traffic of vehicles is frequent because the visibility is deteriorated by dust. As a ventilation method, a method in which fresh air is taken in by an induction fan and polluted air in the tunnel is discharged to the atmosphere is used, but if polluted air is directly discharged into the atmosphere, the living environment near the exhaust tower will be polluted by dust. Therefore, it is necessary to remove soot and dust before discharging.
【０００３】従来、ばいじん除去装置として２段型電気
集塵装置が適用されているが、都市部において新たに設
置する場合、設置場所の確保の面から集じん装置は小形
化が要求され、小形化を図るには電気集塵装置内を通過
するガス流速はおのずと高まることになる。従来、自動
車道トンネルに用いられる電気集塵装置の処理ガス流速
は７ｍ／ｓを標準仕様に定めているが、トンネルガスを
直接処理する場合にはトンネル内のガス流速に等しい１
５ｍ／ｓに高める必要がある。一方、煙道排ガス処理用
電気集塵装置は、煙道ガス流速より速度を落して１.５
ｍ／ｓ 程度で処理するために集塵装置の設置面積が大
きくなるという欠点がある。そこでこれを煙道ガス流速
で処理すると集塵装置を煙道に設置することが可能とな
り、極めて経済的となる。しかし電気集塵器の集塵機能
は、ガス流速を高めると集塵電極に捕集されたばいじん
がガス流に同伴する、いわゆる再飛散現象が生じて集塵
率が低下することが判明した。図８は従来の電気集塵器
による集塵器（ＥＰと略す）内のガス流速と再飛散率の
関係を示す。ガス流速が８ｍ／ｓ付近から再飛散率が大
きくなりはじめ、１５ｍ／ｓになると捕集したばいじん
の多くは再飛散し、集じん効果が失われることになる。
図３は従来形電気集塵器のガス流速１５ｍ／ｓにおける
粒子径別集塵率を示す。電気集じん器では粒子径が大き
いほど帯電量が大きくなって集塵率は高くなるのが一般
的な特性であるが、図６に示すように、ガス流速１５ｍ
／ｓでは逆に粒子径が大きいほど集塵率が低くなる特性
を示しており、大きい粒子になるほど再飛散が高くなる
ことが判った。すなわち、２μｍ程度以下の細かい粒子
は比表面積が大きいために物理的付着力が強く再飛散し
にくいが、それより大きい粒子になるに従い付着力が弱
くなるために再飛散が生じてくる。この再飛散を防止す
る方法としてボイラ排ガスを処理する１段型電気集じん
器では、集塵極を濡れ壁にする方法が古くから知られて
いる。例えば、特開昭53−84867 号公報に開示されるよ
うに集塵極を２重構造として内部に水を供給し、電極の
上部より溢流を形成して集塵極表面を濡らす方法や、他
の方法として集塵極板に水を噴霧して濡れ壁を形成する
方法などがある。Conventionally, a two-stage type electrostatic precipitator has been applied as a dust remover, but when newly installed in an urban area, it is required to downsize the dust remover from the viewpoint of securing an installation place, and a small size. To achieve this, the flow velocity of the gas passing through the inside of the electrostatic precipitator naturally increases. Conventionally, the processing gas flow rate of the electrostatic precipitator used for a highway tunnel is set to 7 m / s as a standard specification, but when the tunnel gas is directly processed, it is equal to the gas flow rate in the tunnel.
It is necessary to increase it to 5 m / s. On the other hand, the electrostatic precipitator for flue gas treatment is slower than the flue gas flow velocity for 1.5
Since the processing is performed at about m / s, there is a drawback that the installation area of the dust collector becomes large. Therefore, if this is processed at a flue gas flow rate, a dust collector can be installed in the flue, which is extremely economical. However, it has been found that the dust collecting function of the electrostatic precipitator lowers the dust collecting rate due to a so-called re-scattering phenomenon in which the dust collected by the dust collecting electrode accompanies the gas flow when the gas flow rate is increased. FIG. 8 shows the relationship between the gas flow velocity in the dust collector (abbreviated as EP) by the conventional electric dust collector and the re-scattering rate. When the gas flow velocity is around 8 m / s, the re-scattering rate starts to increase, and when it reaches 15 m / s, most of the collected dust is re-scattered and the dust collection effect is lost.
FIG. 3 shows the dust collection rate by particle size at a gas flow rate of 15 m / s in a conventional electrostatic precipitator. Generally, in an electrostatic precipitator, the larger the particle size, the larger the amount of charge and the higher the dust collection rate, but as shown in FIG. 6, the gas flow rate is 15 m.
On the other hand, in / s, on the contrary, the larger the particle diameter, the lower the dust collection rate, and the larger the particles, the higher the re-scattering. That is, fine particles having a size of about 2 μm or less have a large specific surface area and thus have a strong physical adhesive force and are difficult to re-disperse. However, as the particles become larger, the adhesive force becomes weaker and re-dispersion occurs. As a method for preventing this re-scattering, in the one-stage type electrostatic precipitator for treating boiler exhaust gas, a method of making the dust collecting electrode a wet wall has been known for a long time. For example, as disclosed in JP-A-53-84867, a method in which a dust collecting electrode has a double structure and water is supplied to the inside to form an overflow from the upper part of the electrode to wet the surface of the dust collecting electrode, As another method, there is a method of forming a wet wall by spraying water on the dust collecting electrode plate.
【０００４】[0004]
【発明が解決しようとする課題】上述のように、集塵電
極を濡れ壁にして再飛散を防止する方法では、放電極と
集塵極の電極間隔が１段型電気集塵装置のように数十mm
から数百mmの幅広い間隔であれば濡れ壁を形成できる
が、自動車道トンネル用電気集塵器のように十mm以下の
狭い電極間隔では濡れ壁を形成することは実用上困難で
あることの他に、ガス流速が速いために液滴が飛散して
逆に２次公害を招くことになり、如何にして再飛散を抑
制し電極表面を湿らせるように噴霧するかが課題であっ
た。As described above, in the method of making the dust collecting electrode a wet wall to prevent re-scattering, the electrode interval between the discharge electrode and the dust collecting electrode is the same as in the one-stage type electrostatic dust collector. Tens of mm
It is possible to form a wetting wall with a wide interval of 100 mm to several hundred mm, but it is practically difficult to form a wetting wall with a narrow electrode interval of 10 mm or less like an electric dust collector for a roadway tunnel. In addition, since the gas flow velocity is high, liquid droplets are scattered to cause secondary pollution, and another problem is how to suppress re-scattering and spray the electrode surface so as to wet it.
【０００５】本発明の目的は、集塵電極に湿りを与えて
ばいじんに付着力を増し、再飛散を防止することにあ
る。An object of the present invention is to moisten the dust collecting electrode to increase dust and dust adhesion and prevent re-scattering.
【０００６】[0006]
【課題を解決するための手段】粒子に電荷を与える帯電
部と帯電した粒子を捕集する集塵部からなる２段形電気
集塵器において、集塵器のガス流入側に水溶液を噴霧す
るスプレイノズルを備え、集塵器の流入側と流出側のば
いじん濃度を検出し集塵率が設定値以下になるとき、自
動的に水溶液を噴霧する手段を設ける。水溶液の液滴径
は数十μｍ以下にし、これを達成するために空気と水溶
液の２流体混合ノズルを用いる。噴霧する水溶液は水ま
たはアルカリ系の水溶液を用いる。In a two-stage type electrostatic precipitator comprising a charging section for giving an electric charge to particles and a dust collecting section for collecting the charged particles, an aqueous solution is sprayed on a gas inflow side of the dust collector. Provided with a spray nozzle, means for automatically detecting the dust concentration on the inflow side and the outflow side of the dust collector and automatically spraying the aqueous solution when the dust collection rate becomes less than a set value. The droplet diameter of the aqueous solution is set to several tens of μm or less, and a two-fluid mixing nozzle for air and the aqueous solution is used to achieve this. The sprayed aqueous solution is water or an alkaline aqueous solution.
【０００７】２段型電気集塵器のガス流入側に水溶液を
噴霧すると、液滴は気流に同伴して帯電部に導入され
る。帯電部はコロナ放電が形成され、放電場を通過する
液滴及びばいじんは放電によって生じるイオンの衝突に
よって帯電される。帯電した液滴とばいじんは集塵部に
導入され、クーロン力によってばいじんと液滴はガス中
より分離して同時に集塵極へ捕集される。集塵極に導か
れたばいじんと液滴は互いに層状に付着されるので液滴
がバインダとなって付着力が増して再飛散を防止するこ
とができる。連続的にスプレイを行うと水溶液の使用量
を高めるばかりでなく、集塵極が水溶液によって液膜と
なり、集塵極から溶液が滴下するときに水の再飛散を生
じるので間欠的に噴霧し、集塵極は湿りを与える程度が
好ましい。水溶液を噴霧する噴霧頻度は、例えばばいじ
んの再飛散を検出して行う方法がある。これは電気集塵
器入口と出口のばいじん濃度を測定し、ばいじん濃度を
比較評価し、集塵率が設定値以下になると噴霧を行うよ
うにして集塵性能を維持する。アルカリ系水溶液は潮解
性があり、集塵電極への付着力が高まる。When the aqueous solution is sprayed on the gas inflow side of the two-stage electrostatic precipitator, the liquid droplets are entrained in the air stream and introduced into the charging section. Corona discharge is formed in the charging section, and the droplets and dust passing through the discharge field are charged by collision of ions generated by the discharge. The charged droplets and dust are introduced into the dust collecting portion, and the Coulomb force separates the dust and droplets from the gas and simultaneously collects them on the dust collecting electrode. Since the dust and the liquid droplets guided to the dust collecting electrode are attached to each other in a layered manner, the liquid droplets serve as a binder to increase the adhesive force and prevent re-scattering. Continuous spraying not only increases the amount of aqueous solution used, but the dust collecting electrode becomes a liquid film due to the aqueous solution, and when the solution drips from the dust collecting electrode, water is re-sprayed, so spraying intermittently, It is preferable that the dust collecting electrode be moist. As for the spray frequency of spraying the aqueous solution, for example, there is a method of detecting re-scattering of soot and dust. This measures the dust concentration at the inlet and outlet of the electrostatic precipitator, compares and evaluates the dust concentration, and sprays when the dust collection rate falls below a set value to maintain the dust collection performance. The alkaline aqueous solution is deliquescent, and the adhesive force to the dust collecting electrode is enhanced.
【０００８】[0008]
【発明の実施の形態】図１は本発明の自動車道トンネル
用電気集じん装置の一実施例の説明図を示す。１は帯電
部であり、１１は放電極、１２は接地極、２は集塵部を
示し、２１は高圧極、２２は集塵極である。３は水溶液
噴霧装置、３１はスプレイノズル、４，４′はばいじん
濃度計を示す。以上の構成からなる電気集じん装置の作
用について詳述する。自動車道トンネル排ガスは、誘引
ファンにより図１の電気集じん装置に導入される。トン
ネル内のばいじんは、自動車より排出するすすと称する
ばいじんと路上のふんじんとの混合物であり、粒径分布
の一例を示すと個数分布では図７のように、１μｍ以下
から１０μｍを超える粒径まで分布している。粒径が大
きいばいじんは個数濃度は小さいが重量濃度は高く、大
気汚染の対象となっている。噴霧装置３では、空気と水
溶液を混合して噴霧する２流体スプレイノズルがガス流
路空間に配置され、液滴径が数十μｍの大きさとして気
流中に噴霧され、その液滴は気流に同伴してばいじんと
共に帯電部１に導入される。帯電部１は放電極１１と接
地極１２が複数対配設された電極群からなり、両電極間
に高圧電源１３より印加した直流高電圧によってコロナ
放電が発生する。放電場を通過する液滴およびばいじん
はコロナ放電によって生成するイオンによって帯電され
る。ばいじんや液滴の帯電量は粒径の表面積に比例する
ので粒径が大きいほど帯電量は大きい。このように帯電
したばいじんおよび液滴は集塵部２へ導かれる。集塵部
２は、平板電極で構成された高圧極２１と集塵極２２が
交互に配置され、高圧電源２３により両極間に直流高電
圧が印加され高電界が形成されており、ばいじんおよび
液滴はクーロン力により集塵極２２へ捕集される。図４
は本発明におけるばいじん及び液滴の集塵電極２２への
捕集状況を示す。図４に示すように、ばいじん及び液滴
は集塵極２２において層状に捕集されるので電極面では
付着力が高まり粗粒子でも再飛散を防止することが可能
となる。ここで、スプレイノズル３１より噴霧する液滴
を連続的に行うと電極表面は液膜が生じて液滴が再飛散
するので、水溶液の噴霧をコントロールする必要があ
る。その方法として、噴霧液量を調整する方法と噴霧量
を一定にして間欠的に噴霧する方法がある。噴霧を停止
して集塵極２２表面が乾燥すると、再飛散が生じるので
集塵器出口のばいじん濃度を計測し、所定濃度以上にな
ったら噴霧を行う。ばいじん濃度計測は２μｍ以下の微
細な粒子は付着力が比較的に強いために再飛散が生じに
くいので、好ましくは２μｍ以上の粗粒子を計測すると
飛散の割合を評価するのに効果的である。自動車道トン
ネル内のばいじん濃度は時期的に変化をするので、集塵
器入口濃度の変化に応じて所定の集塵率が達成できるよ
うに水溶液の噴霧頻度をコントロールすると経済的であ
る。このためには、集塵器入口と出口の濃度の比を一定
になるように調整される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an embodiment of an electrostatic precipitator for a roadway tunnel according to the present invention. 1 is a charging part, 11 is a discharge electrode, 12 is a grounding electrode, 2 is a dust collecting part, 21 is a high voltage electrode, and 22 is a dust collecting electrode. 3 is an aqueous solution spraying device, 31 is a spray nozzle, and 4 and 4'denotes a soot and dust concentration meter. The operation of the electrostatic precipitator having the above configuration will be described in detail. Exhaust gas from the tunnel of the motorway is introduced into the electrostatic precipitator of FIG. 1 by an induction fan. The soot and dust in the tunnel is a mixture of soot and dust called soot discharged from automobiles and dust on the road. As an example of particle size distribution, in the number distribution, as shown in Fig. 7, the particle size is from 1 μm or less to over 10 μm. It is distributed up to. Soot and dust with a large particle size have a low number concentration but a high weight concentration, and are subject to air pollution. In the spraying device 3, a two-fluid spray nozzle that mixes air and an aqueous solution and sprays them is arranged in the gas flow path space, and the droplets are sprayed into the air stream with a diameter of several tens of μm, and the droplets form an air stream. It is introduced into the charging unit 1 together with the dust. The charging unit 1 is composed of an electrode group in which a plurality of pairs of discharge electrodes 11 and ground electrodes 12 are arranged, and corona discharge is generated by a high DC voltage applied from a high voltage power supply 13 between both electrodes. Droplets and dust that pass through the discharge field are charged by the ions produced by the corona discharge. Since the charge amount of dust and droplets is proportional to the surface area of the particle size, the larger the particle size, the greater the charge amount. Dust and droplets thus charged are guided to the dust collecting unit 2. In the dust collecting portion 2, high voltage electrodes 21 and dust collecting electrodes 22 each composed of a flat plate electrode are alternately arranged, and a high DC voltage is applied between both electrodes by a high voltage power source 23 to form a high electric field. The drops are collected on the dust collecting electrode 22 by the Coulomb force. FIG.
Shows the state of collecting dust and liquid droplets on the dust collecting electrode 22 in the present invention. As shown in FIG. 4, since dust and liquid droplets are collected in layers at the dust collecting electrode 22, the adhesive force increases on the electrode surface, and re-scattering of coarse particles can be prevented. Here, when the liquid droplets sprayed from the spray nozzle 31 are continuously formed, a liquid film is formed on the electrode surface and the liquid droplets are scattered again. Therefore, it is necessary to control the spraying of the aqueous solution. As the method, there are a method of adjusting the amount of spray liquid and a method of intermittently spraying with a constant spray amount. When the surface of the dust collecting electrode 22 is dried after the spraying is stopped, re-scattering occurs. Therefore, the dust concentration at the outlet of the dust collector is measured, and when the dust concentration exceeds a predetermined concentration, spraying is performed. In the measurement of dust concentration, fine particles of 2 μm or less have a relatively strong adhesive force, and therefore re-scattering is less likely to occur. Therefore, measuring coarse particles of 2 μm or more is effective in evaluating the scattering rate. Since the dust concentration in the tunnel of a motorway changes with time, it is economical to control the spray frequency of the aqueous solution so that a predetermined dust collection rate can be achieved according to the change in the dust collector inlet concentration. To this end, the dust collector inlet and outlet concentration ratios are adjusted to be constant.
【０００９】図２は本発明の電極洗浄法を示す電気集塵
器の構成図を示す。電気集塵器はユニット化して複数個
配設され、集塵器の入口と出口側にダンパ５，５′がそ
れぞれのガス通路に設けられる。集塵極２２がばいじん
の捕集によって汚れると火花放電が起こり始めるので集
塵器を洗浄して清浄化する必要がある。通常、空気と液
体の混合噴霧である２流体ノズルは噴霧液滴径を細かく
することはできるが、電極を水洗する場合には２流体に
よる噴霧は洗浄効果が低く好ましくない。そこでガス通
路のダンパ５，５′を閉じた後、２流体のうち空気流路
のバルブ６を遮断し、溶液のみを噴射することによって
噴霧液滴を大きくして噴射圧力を増し、洗浄効果を高め
ることができる。すなわち、集塵時には２流体噴霧を実
施し、電極洗浄時には１流体噴霧を行うのである。FIG. 2 is a block diagram of an electrostatic precipitator showing the electrode cleaning method of the present invention. A plurality of electrostatic precipitators are unitized and arranged, and dampers 5 and 5 ′ are provided in the respective gas passages on the inlet and outlet sides of the precipitator. If the dust collecting electrode 22 becomes dirty due to the collection of dust, spark discharge starts to occur, and therefore the dust collector must be cleaned and cleaned. Normally, a two-fluid nozzle, which is a mixed spray of air and liquid, can make the spray droplet diameter fine, but when the electrode is washed with water, spraying with two fluids is not preferable because the cleaning effect is low. Therefore, after closing the dampers 5 and 5'of the gas passage, the valve 6 of the air flow path of the two fluids is shut off, and only the solution is sprayed to increase the sprayed droplets and increase the spraying pressure. Can be increased. That is, the two-fluid spray is performed at the time of dust collection, and the one-fluid spray is performed at the time of cleaning the electrode.
【００１０】次に、実施例結果について述べる。Next, the results of the embodiment will be described.
【００１１】 実施例の結果１ 実験条件 処理ガス量：２０ｍ3／min（電極内ガス流速１５ｍ／ｓ） ばいじん濃度：５mg／ｍ3 噴霧量：（従来法は噴霧液無し） 本発明：水溶液：水 ０.０５リットル／min 空 気：１０リットル／min，噴霧圧力：３kg／cm3 噴霧頻度：１分噴霧，１０分休止Results of Example 1 Experimental conditions Treatment gas amount: 20 m 3 / min (gas flow rate in the electrode: 15 m / s) Dust concentration: 5 mg / m 3 Spray amount: (no spray liquid in conventional method) Invention: Aqueous solution: Water 0.05 liter / min Air: 10 liter / min, Spray pressure: 3 kg / cm 3 Spray frequency: 1 minute spray, 10 minutes rest
【００１２】[0012]
【表１】 [Table 1]
【００１３】 実施例の結果２ 実験条件 処理ガス量：２０ｍ3／min（電極内ガス流速１５ｍ／ｓ） ばいじん濃度：５mg／ｍ3 噴霧量：（従来法は噴霧液無し） 本発明：水溶液：ＮａＯＨ０.５％水溶液,０.０５リットル／min 空 気：１０リットル／min 噴霧圧力：３kg／cm3 噴霧頻度：１分噴霧，２０分休止Result of Example 2 Experimental condition Treatment gas amount: 20 m 3 / min (gas flow rate in the electrode 15 m / s) Dust concentration: 5 mg / m 3 Spray amount: (no spray liquid in conventional method) Present invention: aqueous solution: NaOH 0.5% aqueous solution, 0.05 liter / min Air: 10 liter / min Spray pressure: 3 kg / cm 3 Spray frequency: 1 minute spray, 20 minutes rest
【００１４】[0014]
【表２】 [Table 2]
【００１５】表１は上記に示す実験条件のもとに行った
もので、従来法は電気集塵器のみで液の噴霧は行ってい
ない。実験は１分間噴霧して１０分間休止するインター
バルの結果を示した。表２は噴霧液として０.５％ のア
ルカリ水溶液を用い、噴霧間隔を２０分にした結果を示
す。休止時間を長くしていくと徐々に再飛散が始まり集
塵性能は低下していくが、噴霧溶液として水よりアルカ
リ水溶液が再飛散防止効果が高いことが判った。Table 1 was carried out under the above experimental conditions, and in the conventional method, only the electrostatic precipitator was used and the liquid was not sprayed. The experiment showed results for an interval of 1 minute spray and 10 minutes rest. Table 2 shows the results when a 0.5% alkaline aqueous solution was used as the spray liquid and the spray interval was 20 minutes. It was found that the redispersion started gradually as the rest time was prolonged, and the dust collection performance deteriorates, but the redispersion prevention effect of the alkaline aqueous solution as the spray solution was higher than that of water.
【００１６】図３は本発明の他の実施例電気集塵装置の
説明図を示す。すなわち、帯電部１と集塵部２の間にス
プレイノズル３１を配置した構成である。本構成にする
と帯電部１においてばいじんに電荷を与え、液滴は集塵
部２の流入側におけるコロナ放電で帯電されて、ばいじ
んと液滴は集塵部で捕集される。図５は本発明における
集塵部における液滴の帯電と集塵状況を示す。集塵部２
の高圧極２１のガス流入端部の先端に鋭利なフィン７を
設け、フィン７と集塵極２２との間にコロナ放電を行わ
せる。集塵部に流入するばいじんは帯電部１ですでに電
荷を得ているが、液滴はフィン７と集塵極との間で形成
されるコロナ放電により帯電されて集塵電極２２に捕集
することができる。本方式によれば、帯電部１で捕集さ
れる液滴がないために噴霧液量を節約することができ
る。FIG. 3 is an explanatory view of an electrostatic precipitator according to another embodiment of the present invention. That is, the spray nozzle 31 is arranged between the charging unit 1 and the dust collecting unit 2. With this configuration, the charging unit 1 applies a charge to dust and particles, the droplets are charged by corona discharge on the inflow side of the dust collecting unit 2, and the dust and droplets are collected by the dust collecting unit. FIG. 5 shows the charging of the droplets and the dust collecting condition in the dust collecting portion in the present invention. Dust collection unit 2
A sharp fin 7 is provided at the tip of the gas inflow end of the high-voltage electrode 21 to cause corona discharge between the fin 7 and the dust collecting electrode 22. The dust that has flowed into the dust collecting portion has already been charged by the charging portion 1, but the droplets are charged by the corona discharge formed between the fin 7 and the dust collecting electrode and collected by the dust collecting electrode 22. can do. According to this method, the amount of spray liquid can be saved because there are no droplets collected by the charging unit 1.
【００１７】また、粒子帯電と集塵を同一領域で行う１
段形電気集塵装置においても本発明方式の適用で再飛散
防止効果を発揮し、集塵性能の向上を図ることができ
る。Further, particle charging and dust collection are performed in the same area.
Even in the step-type electrostatic precipitator, application of the method of the present invention exerts the effect of preventing re-scattering and can improve the dust collecting performance.
【００１８】[0018]
【発明の効果】本発明によれば、処理ガス量に対して僅
かの水溶液をガス中に噴霧することにより高流速処理用
電気集塵装置の再飛散を防止し、コンパクトで経済的に
も優れた自動車道トンネル用電気集塵装置を提供するこ
とができる。EFFECTS OF THE INVENTION According to the present invention, by spraying a slight amount of an aqueous solution into the gas to the amount of the processing gas, the re-scattering of the high-speed processing electrostatic precipitator is prevented, and it is compact and economically excellent. It is possible to provide an electric dust collector for a highway tunnel.
【図１】本発明の一実施例電気集塵装置の説明図。FIG. 1 is an explanatory view of an electrostatic precipitator according to an embodiment of the present invention.
【図２】本発明の電極洗浄法を示す電気集塵装置の説明
図。FIG. 2 is an explanatory view of an electrostatic precipitator showing an electrode cleaning method of the present invention.
【図３】本発明の他の実施例電気集塵装置の説明図。FIG. 3 is an explanatory view of an electrostatic precipitator according to another embodiment of the present invention.
【図４】本発明におけるばいじん及び液滴の集塵電極２
２への捕集状況の説明図。FIG. 4 is a dust collecting electrode 2 for dust and liquid droplets according to the present invention.
Explanatory drawing of the collection condition to 2.
【図５】本発明における集塵部の液滴帯電と集塵状況の
説明図。5A and 5B are explanatory views of droplet charging and a dust collecting state of the dust collecting portion according to the present invention.
【図６】従来の電気集塵器の粒径別集塵の特性図。FIG. 6 is a characteristic diagram of particle size-based dust collection of a conventional electrostatic precipitator.
【図７】自動車道トンネル内のばいじんの粒径個数分布
の特性図。FIG. 7 is a characteristic diagram of particle size number distribution of soot and dust in a tunnel of a motorway.
【図８】従来の電気集塵器のガス流速と再飛散率の特性
図。FIG. 8 is a characteristic diagram of gas flow velocity and re-scattering rate of a conventional electrostatic precipitator.
１…帯電部、１１…放電極、１２…接地極、２…集塵
部、２１…高圧極、２２…集塵極、３…水溶液噴霧装
置、３１…スプレイノズル、４，４′…ばいじん濃度測
定器、５，５′…ダンパ。DESCRIPTION OF SYMBOLS 1 ... Charging part, 11 ... Discharge electrode, 12 ... Grounding electrode, 2 ... Dust collecting part, 21 ... High voltage electrode, 22 ... Dust collecting electrode, 3 ... Aqueous solution spraying device, 31 ... Spray nozzle, 4, 4 '... Dust concentration Measuring instruments, 5, 5 '... Dampers.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高津 恭 茨城県土浦市神立町603番地 株式会社日 立製作所土浦工場内 (72)発明者 浅沼 邦広 茨城県土浦市神立町603番地 株式会社日 立製作所土浦工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kyo Takatsu 603 Jinritsu-cho, Tsuchiura-shi, Ibaraki Hitate Works Co., Ltd. Tsuchiura factory (72) Kunihiro Asanuma 603, Kintate-cho, Tsuchiura-shi, Ibaraki Hiritsu Works Co., Ltd. Tsuchiura factory
Claims (8)
を捕集する集塵部からなる２段形電気集塵器において、
集塵器のガス流入側に水溶液を噴霧するスプレイノズル
を備え、前記集塵器の流入側と流出側のばいじん濃度を
検出し集塵率が設定値以下になるとき、自動的に水溶液
を噴霧することを特徴とする電気集塵装置。1. A two-stage type electrostatic precipitator comprising a charging section for giving a charge to particles and a dust collecting section for collecting charged particles,
Equipped with a spray nozzle for spraying the aqueous solution on the gas inflow side of the dust collector, it detects the dust concentration on the inflow side and the outflow side of the dust collector and automatically sprays the aqueous solution when the dust collection rate falls below the set value. An electrostatic precipitator characterized by:
流体ノズルであり、集塵過程では２流体噴霧を行い、電
極洗浄時には１流体噴霧を行う請求項１に記載の電気集
じん装置。2. The spray nozzle comprises an aqueous solution and air.
The electrostatic precipitator according to claim 1, wherein the electrostatic precipitator is a fluid nozzle and performs two-fluid spraying in a dust collecting process and one-fluid spraying during electrode cleaning.
ム，水酸化ナトリウム等のアルカリ性水溶液である請求
項１に記載の電気集塵装置。3. The electrostatic precipitator according to claim 1, wherein the aqueous solution is water or an alkaline aqueous solution of sodium sulfite, sodium hydroxide or the like.
しくは２μｍ以上の粒子を検出して比較評価する電気集
塵装置。4. An electrostatic precipitator for detecting dust particles having a particle size of 2 μm or more for comparative evaluation.
を捕集する集塵部からなる２段形電気集塵器において、
前記帯電部と前記集塵部の間に水溶液を噴霧するスプレ
イノズルを備え、集塵器の流入側と流出側のばいじん濃
度を検出し集塵率が設定値以下になるとき、自動的に水
溶液を噴霧することを特徴とする電気集塵装置。5. A two-stage type electrostatic precipitator comprising a charging part for giving an electric charge to the particles and a dust collecting part for collecting the charged particles,
A spray nozzle that sprays an aqueous solution between the charging section and the dust collecting section is provided, and when the dust concentration on the inflow side and the outflow side of the dust collector is detected and the dust collection rate is below a set value, the aqueous solution is automatically added. An electrostatic precipitator characterized by spraying.
霧するスプレイノズルを備え、前記集塵部の高圧電極の
ガス流入端部にコロナ放電を行わせるフィンを備えた請
求項５に記載の電気集塵装置。6. A spray nozzle for spraying an aqueous solution is provided between the charging unit and the dust collecting unit, and a fin for performing corona discharge is provided at a gas inflow end of the high-voltage electrode of the dust collecting unit. The electrostatic precipitator described in.
気集塵において、集塵器のガス流入側に水溶液を噴霧す
るスプレイノズルを備え、集塵器の流入側と流出側のば
いじん濃度を検出し集塵率が設定値以下になるとき、自
動的に水溶液を噴霧することを特徴とする電気集塵装
置。7. A one-stage type electrostatic precipitator in which particle charging and dust collection are performed in the same region, a spray nozzle for spraying an aqueous solution is provided on the gas inflow side of the dust collector, and the inflow side and the outflow side of the dust collector are provided. An electrostatic precipitator that detects the dust concentration and automatically sprays an aqueous solution when the dust collection rate falls below a set value.
るガスの電極内流速が８ｍ／ｓ以上において稼働する電
気集塵装置。8. The electrostatic precipitator according to claim 1 or 7, wherein the gas to be treated operates at an electrode flow velocity of 8 m / s or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9079596A JPH09276734A (en) | 1996-04-12 | 1996-04-12 | Electrostatic precipitator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9079596A JPH09276734A (en) | 1996-04-12 | 1996-04-12 | Electrostatic precipitator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09276734A true JPH09276734A (en) | 1997-10-28 |
Family
ID=14008528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9079596A Pending JPH09276734A (en) | 1996-04-12 | 1996-04-12 | Electrostatic precipitator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09276734A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10244183A (en) * | 1997-03-06 | 1998-09-14 | Mitsubishi Heavy Ind Ltd | Electrostatic precipitator and method of backwashing and scavenging same |
| JP2002191922A (en) * | 2000-12-28 | 2002-07-10 | Earth Kensetsu Consultant Kk | Method and equipment for cleaning floating particles |
| JP2004337652A (en) * | 2003-05-13 | 2004-12-02 | San Techno Kk | Wet electrostatic precipitator |
| JP2008221175A (en) * | 2007-03-15 | 2008-09-25 | Matsushita Electric Ind Co Ltd | Electric dust collector |
| KR100862796B1 (en) * | 2002-09-13 | 2008-10-13 | 주식회사 포스코 | An apparatus for cleaning a electric dust collector |
| NL2003259C2 (en) * | 2009-07-22 | 2011-01-25 | Univ Delft Tech | Method for the removal of a gaseous fluid and arrangement therefore. |
| CN103406202A (en) * | 2013-08-02 | 2013-11-27 | 浙江海亮能源管理有限公司 | Electrostatic precipitator for exhaust gas through wet process |
| JP2015020094A (en) * | 2013-07-17 | 2015-02-02 | シャープ株式会社 | Air cleaning apparatus and air cleaning method |
| JP2017154112A (en) * | 2016-03-04 | 2017-09-07 | 新日鐵住金株式会社 | Electric dust collector, and adjustment method therefor |
| CN110116050A (en) * | 2019-06-05 | 2019-08-13 | 李焱 | A kind of composite purification device |
| CN110368766A (en) * | 2019-08-07 | 2019-10-25 | 绍兴电力设备有限公司 | A kind of aluminium bar workshop soot processing device and technique |
| KR102073202B1 (en) * | 2019-04-19 | 2020-02-25 | 주식회사 글로벌스탠다드테크놀로지 | Self-cleanable discharge rod for electric dust collector and self-cleaning method of discharge rod for electric dust collector using the same |
-
1996
- 1996-04-12 JP JP9079596A patent/JPH09276734A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10244183A (en) * | 1997-03-06 | 1998-09-14 | Mitsubishi Heavy Ind Ltd | Electrostatic precipitator and method of backwashing and scavenging same |
| JP2002191922A (en) * | 2000-12-28 | 2002-07-10 | Earth Kensetsu Consultant Kk | Method and equipment for cleaning floating particles |
| KR100862796B1 (en) * | 2002-09-13 | 2008-10-13 | 주식회사 포스코 | An apparatus for cleaning a electric dust collector |
| JP2004337652A (en) * | 2003-05-13 | 2004-12-02 | San Techno Kk | Wet electrostatic precipitator |
| JP2008221175A (en) * | 2007-03-15 | 2008-09-25 | Matsushita Electric Ind Co Ltd | Electric dust collector |
| WO2011010918A1 (en) * | 2009-07-22 | 2011-01-27 | Technische Universiteit Delft | Method for the removal of a gaseous fluid and arrangement therefore |
| NL2003259C2 (en) * | 2009-07-22 | 2011-01-25 | Univ Delft Tech | Method for the removal of a gaseous fluid and arrangement therefore. |
| US9132383B2 (en) | 2009-07-22 | 2015-09-15 | Memic Europe B.V. | Method for the removal of a gaseous fluid and arrangement therefore |
| JP2015020094A (en) * | 2013-07-17 | 2015-02-02 | シャープ株式会社 | Air cleaning apparatus and air cleaning method |
| CN103406202A (en) * | 2013-08-02 | 2013-11-27 | 浙江海亮能源管理有限公司 | Electrostatic precipitator for exhaust gas through wet process |
| JP2017154112A (en) * | 2016-03-04 | 2017-09-07 | 新日鐵住金株式会社 | Electric dust collector, and adjustment method therefor |
| KR102073202B1 (en) * | 2019-04-19 | 2020-02-25 | 주식회사 글로벌스탠다드테크놀로지 | Self-cleanable discharge rod for electric dust collector and self-cleaning method of discharge rod for electric dust collector using the same |
| CN110116050A (en) * | 2019-06-05 | 2019-08-13 | 李焱 | A kind of composite purification device |
| CN110368766A (en) * | 2019-08-07 | 2019-10-25 | 绍兴电力设备有限公司 | A kind of aluminium bar workshop soot processing device and technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1075872B1 (en) | Electrostatic dust collector | |
| JPH09276734A (en) | Electrostatic precipitator | |
| JP3537553B2 (en) | Dust charged wet desulfurization equipment | |
| CN205435424U (en) | Synchronous SOx/NOx control demercuration system | |
| CN104069713B (en) | A kind of electricity-bag dust collecting process strengthening coalescence | |
| JP3958622B2 (en) | Method and apparatus for collecting suspended particulate matter | |
| KR20210123587A (en) | Hybrid Dust Collector | |
| CA1249529A (en) | Apparatus for the removal of particulates from industrial gases | |
| JP3667109B2 (en) | Electric dust collector and electric dust collecting method | |
| JPH11517A (en) | Two-stage type dust collector and dust collection method | |
| CN208398262U (en) | A kind of purification of architecture indoor air draught and humidifier | |
| KR100561550B1 (en) | method and apparatus for collecting a dust and cleaning air by electrostatic spray | |
| JP2007330898A (en) | Dust collector | |
| JPH03154656A (en) | Wet dust collector for coating booth | |
| JP3661364B2 (en) | Electric dust collector | |
| JP3695637B2 (en) | Air purification processing equipment | |
| JPH09187675A (en) | Fine granular body removing device | |
| CN109045922A (en) | Electroacoustic wet scrubber | |
| KR102289066B1 (en) | Dust collecting apparatus mounted on a roof of vehicle | |
| KR102280310B1 (en) | Dust collecting apparatus for vehicle | |
| Douglas et al. | An investigation of the operating parameters of a low energy wet scrubber for fine particulates | |
| JPH08168696A (en) | Small-sized high velocity electric dust collector by high current density operation | |
| CN110170378B (en) | Wet-type electric precipitation haze control system and application method | |
| JP2005021736A (en) | Wet type crossflow electric precipitator | |
| JP2002239412A (en) | Gas cleaning system |