JPH0631199A - Duct-type electrostatic precipitator - Google Patents
Duct-type electrostatic precipitatorInfo
- Publication number
- JPH0631199A JPH0631199A JP19413392A JP19413392A JPH0631199A JP H0631199 A JPH0631199 A JP H0631199A JP 19413392 A JP19413392 A JP 19413392A JP 19413392 A JP19413392 A JP 19413392A JP H0631199 A JPH0631199 A JP H0631199A
- Authority
- JP
- Japan
- Prior art keywords
- discharge electrode
- duct
- small
- protrusions
- electrostatic precipitator
- 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.)
- Granted
Links
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- Electrostatic Separation (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、煙突内に設けられた複
数の小ダクトにより集じんを行なうダクト型電気集じん
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct type electrostatic precipitator which collects dust by a plurality of small ducts provided in a chimney.
【０００２】[0002]
【従来の技術】ボイラにおいて重油や石炭等の燃料を燃
焼させると、燃料中の硫黄分が酸化してＳＯx （ＳＯ2
及びＳＯ3 ）が発生するが、このうちＳＯ2 ガスについ
ては排煙脱硫装置を設置すれば高効率で除去することが
できる。ところがＳＯ3 ガスについては、排煙脱硫装置
におけるガスの冷却過程において液化し、極めて微細な
ＳＯ3 ミスト（硫酸ミスト）となるため、排煙脱硫装置
ではほとんど除去できず、煙突から紫煙となって排出さ
れる。近年、排煙脱硫装置の普及に伴なってＳＯx の総
排出量は規制値に抑制されてはいるものの、ＳＯ3 ミス
トによる紫煙が目視公害として新たに注目されている。2. Description of the Related Art When a fuel such as heavy oil or coal is burned in a boiler, the sulfur content in the fuel is oxidized and SOx (SO2
And SO3), of which SO2 gas can be removed with high efficiency by installing a flue gas desulfurizer. However, SO3 gas is liquefied in the process of cooling the gas in the flue gas desulfurization device and becomes extremely fine SO3 mist (sulfuric acid mist), which can hardly be removed by the flue gas desulfurization device and is emitted as purple smoke from the chimney. It In recent years, with the spread of flue gas desulfurization equipment, the total emission amount of SOx has been suppressed to a regulated value, but purple smoke due to SO3 mist has been newly noticed as a visual pollution.
【０００３】この紫煙を目視不可の状態にまで除去する
ためには、煙突出口におけるばいじん濃度を、微細なＳ
Ｏ3 ミストを含めて１０ｍｇ／ｍ3 Ｎもしくはそれ以下
の非常に低いレベルに抑える必要がある。このために、
従来では煙突上流側に湿式電気集じん装置を設置した
り、あるいはよりコンパクトなダクト型電気集じん装置
を煙突上流の煙道ガスダクト内に設置するという方法が
採られている。このダクト型電気集じん装置（以下ダク
ト型ＥＰと称する）は、煙道ガスダクト横断面を仕切っ
て複数の小ダクトを設け、それら小ダクトの内面を集じ
ん極とするとともに、各小ダクトの中心に棒状の放電極
を設け、高圧を印加して荷電するものである。上記小ダ
クトにおける集じん空間は小空間化（ナロウスペイシン
グ）されているため、空間電荷の高い状態にあっても湿
式電気集じん装置に比べ１０倍以上のコロナ放電を電極
空間に供給することができ、湿式電気集じん装置と比べ
集じん率が非常に高い。In order to remove this purple smoke to a state where it cannot be visually observed, the dust concentration at the smoke outlet is adjusted to a fine S value.
It is necessary to control to a very low level of 10 mg / m3 N or less including O3 mist. For this,
Conventionally, a method of installing a wet electrostatic precipitator on the upstream side of the chimney or a more compact duct type electrostatic precipitator in the flue gas duct upstream of the chimney has been adopted. This duct type electrostatic precipitator (hereinafter referred to as duct type EP) is provided with a plurality of small ducts by partitioning the cross section of the flue gas duct, and the inner surface of each of these small ducts serves as a dust collecting pole, and the center of each small duct. A rod-shaped discharge electrode is provided on the, and a high voltage is applied to charge. Since the dust collection space in the small duct is made small (narrow spacing), it is possible to supply corona discharge more than 10 times to the electrode space as compared with the wet electrostatic precipitator even when the space charge is high. And the dust collection rate is very high compared to the wet electric dust collector.
【０００４】ところで、上記放電極としては、湿式電気
集じん装置の１０倍以上の大きなコロナ放電を安定して
供給することができる高電流型の放電極が使用される。
このような高電流型の放電極の一つとして細線ワイヤ
（図６（ａ）参照）があるが、ダクト型ＥＰの場合は電
極をナロウスペイシングとする都合上、位置決めが困難
で火花発生時の振動の影響が懸念される細線ワイヤの適
用は好ましくなく、剛性が高く位置決めが正確に行なえ
る棒状の放電極であることが望ましい。このような剛性
の高い棒状の放電極にて高電流を確保するためには、例
えば図６の（ｂ）に示すごとく、放電極の側面を鋭利な
ナイフエッジ状に成型するか、あるいは放電極の側面に
複数の先端が尖ったトゲ状の突起部を所定間隔で連続的
に設ける等の方法がある。前者については、等価的に放
電極の側面にトゲ状の突起部を無限小の間隔で連続的に
並べたものと考えられるが、このような放電極を用いた
ダクト型ＥＰを実際に運転した場合には、放電極のナイ
フエッジ部がランダムに汚れ、この汚れの程度のわずか
な差により放電極上のコロナ起点の分布が大幅に乱れて
収じん性能の低下につながる恐れがある。したがって、
実運用上は後者の方法、すなわち放電極の側面に複数の
先端が尖ったトゲ状の突起部を設ける方が好ましいこと
が経験的に知られている。By the way, as the discharge electrode, a high current type discharge electrode capable of stably supplying a corona discharge which is 10 times or more as large as that of the wet electrostatic precipitator is used.
There is a thin wire (see FIG. 6 (a)) as one of such high current type discharge electrodes. However, in the case of the duct type EP, positioning is difficult due to the narrow spacing of the electrode and a spark is generated. It is not preferable to use a thin wire, which is likely to be affected by the vibration, and it is preferable to use a rod-shaped discharge electrode that has high rigidity and can be accurately positioned. In order to secure a high current with such a rod-shaped discharge electrode having high rigidity, for example, as shown in FIG. 6B, the side surface of the discharge electrode is formed into a sharp knife edge shape, or the discharge electrode is formed. There is a method in which a plurality of barbed protrusions having sharp tips are continuously provided at predetermined intervals on the side surface of the. Regarding the former, it is considered that the barb-shaped protrusions are equivalently arranged continuously on the side surface of the discharge electrode at infinitely small intervals, but the duct type EP using such discharge electrode was actually operated. In this case, the knife edge portion of the discharge electrode is randomly soiled, and a slight difference in the extent of this soiling may significantly disturb the distribution of the corona starting points on the discharge electrode, leading to a decrease in agitation performance. Therefore,
It has been empirically known that the latter method is practically preferable, that is, it is preferable to provide a plurality of barbed projections having sharp tips on the side surfaces of the discharge electrode.
【０００５】[0005]
【発明が解決しようとする課題】上述したように、ダク
ト型ＥＰの放電極としては、剛性の高い棒状であって且
つその側面上に複数の先端が尖ったトゲ状の突起部を設
けたものが好ましいことが知られている。ところが、そ
のようなトゲ状の突起部を最適にはどのような配置で放
電極に設ければ良いかという点については従来より明確
ではなかった。As described above, the duct-type EP discharge electrode is a rod having a high rigidity and is provided with a plurality of barbed projections having sharp tips on its side surface. Are known to be preferred. However, it has not been clear from the prior art how to optimally arrange such barbed protrusions on the discharge electrode.
【０００６】一般に、放電極上の突起部を少なくしてそ
の分布を粗とした場合には、小ダクト中でコロナ電流の
十分に流れないデッドスペースが生じ、ダクト型ＥＰの
性能が十分に発揮できない傾向にある一方、突起部を多
くしてその分布を密にすればするほど良いというわけで
はなく、突起部がある限界を越えて密になると、もはや
ダクト型ＥＰの集じん性能は向上せず、むしろ条件によ
っては低下する場合がある。これは、コロナ起点となる
突起部同士が近接しすぎると互いのコロナ電流がクエン
チ（抑制）されてしまうからである。また、突起部を増
やすということは、材料費および加工費等の製造コスト
の増加を意味するので、コストの点からもいたずらに多
くの突起部を設けることは好ましくなく、所要の効果を
得るために必要にして最小数の突起部を放電極上に設け
る必要がある。Generally, when the projections on the discharge electrode are reduced and the distribution thereof is made rough, a dead space in which a corona current does not flow sufficiently occurs in a small duct, and the performance of the duct type EP cannot be sufficiently exhibited. On the other hand, there is a tendency, but it is not so good that the number of protrusions is increased to make the distribution denser. When the protrusions become denser than a certain limit, the dust collecting performance of the duct type EP is no longer improved. However, it may decrease depending on the conditions. This is because if the protrusions that are the corona starting points are too close to each other, their corona currents are quenched (suppressed). Further, since increasing the number of protrusions means an increase in manufacturing costs such as material cost and processing cost, it is not preferable to unnecessarily provide many protrusions from the viewpoint of cost, and in order to obtain the required effect. Therefore, it is necessary to provide a minimum number of protrusions on the discharge electrode.
【０００７】本発明は上記事情を考慮してなされたもの
であり、その目的とするところは、放電極上に突起部材
を最適な配置で設けることにより、必要にして最小数の
突起部材で良好な集じん性能を発揮し得るダクト型電気
集じん装置を提供することにある。The present invention has been made in consideration of the above circumstances. An object of the present invention is to provide a protruding member in an optimal arrangement on the discharge electrode so that a minimum required number of protruding members can be obtained. An object of the present invention is to provide a duct-type electrostatic precipitator that can exhibit dust collecting performance.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
本発明は、煙道ガスダクトの内部に配置される複数の筒
状の小ダクトと、これらの小ダクトの軸上に当該小ダク
トの長さ方向に沿って配置される棒状の放電極とを有
し、上記放電極に電圧を印加することにより上記小ダク
トを帯電させて集じんを行なうようにしたダクト型電気
集じん装置において、上記放電極の周方向に沿って等間
隔で３乃至６本の突起部材を配設するとともに、これら
の突起部材を上記放電極の長さ方向に沿って所定間隔で
複数組配設し、且つ当該突起部材の先端から上記小ダク
ト内面までの距離をＤ0 、また当該突起部材の放電極に
おける長さ方向の所定間隔をＰとしたとき、これらの関
係を０．６Ｄ0 ≦Ｐ≦２．４Ｄ0 の範囲に設定するよう
にした。In order to achieve the above object, the present invention provides a plurality of cylindrical small ducts arranged inside a flue gas duct, and the length of the small ducts on the axis of these small ducts. A duct-type electrostatic precipitator having a rod-shaped discharge electrode arranged along the vertical direction, wherein a voltage is applied to the discharge electrode to charge the small duct to collect dust. Three to six protruding members are arranged at equal intervals along the circumferential direction of the discharge electrode, and a plurality of sets of these protruding members are arranged at predetermined intervals along the length direction of the discharge electrode. When the distance from the tip of the projecting member to the inner surface of the small duct is D0 and the predetermined lengthwise interval of the projecting member in the discharge electrode is P, the relationship between them is 0.6D0 ≤ P ≤ 2.4D0. I set it to.
【０００９】[0009]
【作用】上記手段を講じた結果、次のような作用が生じ
る。すなわち、放電極の周方向に沿って等間隔で３乃至
６本、望ましくは４本の突起部材を放射状に配設すると
ともに、これらの突起部材を上記放電極の長さ方向に沿
って所定間隔つまり０．６Ｄ0 ≦Ｐ≦２．４Ｄ0 の範
囲、望ましくは１．２Ｄ0 ≦Ｐ≦１．６Ｄ0 の範囲に設
定されるように複数組配設したことにより、小ダクト中
にはコロナ電流の十分に流れないデッドゾーンを生じる
ことがなくなり、また隣接する突起部の先端から流れる
コロナ電流が互いにクエンチされることもなくなり、集
じん効率の点からも、またコストの点からも、放電極上
に突起部材を最適な配置で設けることが可能となる。こ
れにより、必要にして最小数の突起部材で良好な集じん
性能を発揮し得るダクト型電気集じん装置を提供するこ
とができる。As a result of taking the above-mentioned means, the following effects occur. That is, three to six, preferably four projecting members are radially arranged at equal intervals along the circumferential direction of the discharge electrode, and these projecting members are arranged at predetermined intervals along the length direction of the discharge electrode. That is, by arranging a plurality of sets so as to be set in the range of 0.6D0 ≤ P ≤ 2.4D0, preferably in the range of 1.2D0 ≤ P ≤ 1.6D0, sufficient corona current can be provided in the small duct. A dead zone that does not flow is not generated, corona currents that flow from the tips of adjacent protrusions are not quenched with each other, and the protrusion member is provided on the discharge electrode in terms of dust collection efficiency and cost. Can be provided in an optimal arrangement. As a result, it is possible to provide a duct type electrostatic precipitator that can exhibit good dust collecting performance with a minimum number of protruding members as necessary.
【００１０】[0010]
【実施例】図１の（ａ）〜（ｃ）は、それぞれ本発明の
一実施例に係わるダクト型電気集じん装置で使用される
小ダクトおよび放電極の構成を示す上面図および断面図
である。同図において、各小ダクト１の軸上には、この
小ダクト１の長さ方向に沿ってそれぞれ放電極２ａ〜２
ｃが設けられており、これらの放電極２ａ〜２ｃの側面
には、図示のごとく先端が尖った複数の突起部３が放電
極の周方向に沿って等間隔で放射状に、かつ放電極の長
さ方向に沿って等間隔で設けられている。上記突起部３
の放射状分布に関し、図１の（ａ）は放電極２ａの円周
方向に沿って等間隔で２本の突起部３を設けた場合、図
１の（ｂ）は放電極２ｂの円周方向に沿って等間隔で４
本の突起部３を設けた場合、また図１の（ｃ）は放電極
２ｃの円周方向に沿って等間隔で６本の突起部３を設け
た場合をそれぞれ示している。なお上記（ａ）〜（ｃ）
において、突起部３の先端と小ダクト１の内面との距離
をＤ0 、また突起部３の放電極における長さ方向に沿っ
た設置間隔をＰとする。1 (a) to 1 (c) are a top view and a cross-sectional view showing a structure of a small duct and a discharge electrode used in a duct type electrostatic precipitator according to an embodiment of the present invention, respectively. is there. In the figure, the discharge electrodes 2a to 2 are provided on the axis of each small duct 1 along the length direction of the small duct 1.
c is provided, and a plurality of projections 3 having sharp tips are radially provided at the side surfaces of these discharge electrodes 2a to 2c at equal intervals along the circumferential direction of the discharge electrode, and as shown in FIG. They are provided at equal intervals along the length direction. The protrusion 3
1A shows a case where two protrusions 3 are provided at equal intervals along the circumferential direction of the discharge electrode 2a, FIG. 1B shows the circumferential direction of the discharge electrode 2b. 4 at equal intervals along
FIG. 1C shows the case in which six protrusions 3 are provided, and the case in which six protrusions 3 are provided at equal intervals along the circumferential direction of the discharge electrode 2c. The above (a) to (c)
In, the distance between the tip of the protrusion 3 and the inner surface of the small duct 1 is D0, and the installation interval of the protrusion 3 in the discharge electrode along the length direction is P.
【００１１】上記図１では、小ダクトの断面が円形の場
合を示したが、小ダクトの断面の形状としては円形に限
らず、あらゆる多角形断面が適用可能である。この例を
図２の（ａ）〜（ｃ）に示す。同図において、（ａ）お
よび（ｂ）は小ダクトの断面が矩形（正方形）の場合、
また（ｃ）は小ダクトの断面が六角形の場合を示してい
る。これらの小ダクトの軸上には、放射状に４等分割さ
れて４本の突起部３が取付けられた放電極２ｂが設けら
れている。小ダクトの断面が多角形になると、放電極と
小ダクトとの関係が円形断面の場合とは異なり一意には
決められなくなるが、小ダクトの断面が正方形の場合の
放電極２ｂの配置例として、（ａ）には放電極２ｂの４
本の突起部３を小ダクト４の面方向に向けた場合を、ま
た（ｂ）には放電極２ｂの４本の突起部３を小ダクト４
の対角線方向に向けた場合をそれぞれ示す。これら
（ａ）および（ｂ）において、突起部３の先端と小ダク
ト４との間の距離はそれぞれＤ0 であるとする。Although FIG. 1 shows the case where the cross section of the small duct is circular, the shape of the cross section of the small duct is not limited to the circular shape, and any polygonal cross section can be applied. An example of this is shown in FIGS. In the figure, (a) and (b) are the cases where the cross section of the small duct is rectangular (square),
Further, (c) shows the case where the cross section of the small duct is hexagonal. On the axes of these small ducts, a discharge electrode 2b is provided, which is radially divided into four equal parts and to which four protruding parts 3 are attached. When the cross section of the small duct is polygonal, the relationship between the discharge electrode and the small duct cannot be uniquely determined unlike the case where the cross section is circular, but as an example of the arrangement of the discharge electrode 2b when the cross section of the small duct is square. , (A) has 4 of the discharge electrode 2b.
In the case where the projections 3 of the book are directed in the surface direction of the small duct 4, and in (b), the four projections 3 of the discharge electrode 2b are arranged in the small duct 4.
The respective cases are shown in the diagonal direction. In these (a) and (b), the distance between the tip of the protrusion 3 and the small duct 4 is D0.
【００１２】一方、小ダクトの断面が六角形の場合に
は、小ダクト５の六つの面に対して４本の突起部３が相
対することになるので、図中に示すごとく突起部３の先
端と小ダクト５の内面までの距離Ｄ0 およびＤ0 ′に相
違が生じる。しかしその差は微小であり、突起部３の小
ダクト５に対する方向差がダクト型ＥＰの集じん性能に
与える影響は無視し得るほど小さく、突起部３を小ダク
ト内面のどの方向に向けるかという点については主要な
意味を持たない。On the other hand, when the cross section of the small duct is hexagonal, the four projections 3 face each other with respect to the six surfaces of the small duct 5, so that the projections 3 of the small duct 5 as shown in FIG. Differences occur in the distances D0 and D0 'from the tip to the inner surface of the small duct 5. However, the difference is very small, and the influence of the direction difference of the protrusion 3 on the small duct 5 on the dust collecting performance of the duct type EP is negligibly small, and it depends on which direction of the inner surface of the small duct the protrusion 3 is directed. The point has no major meaning.
【００１３】図３は、放電極の円周方向に沿って等間隔
でＭ本の突起部を放射状に配設した場合について、Ｍの
増減に対するダクト型ＥＰの集じん率の変化を示した図
であり、小ダクトの断面が円形の場合をＡ、正方形の場
合をＢ、そして六角形の場合をＣとした３本の曲線で表
わしている。縦軸は集じん率を表わし、小ダクトが円形
で且つ突起部の本数が４本の場合の集じん率を１として
正規化した集じん性指数として示している。また、各小
ダクトにおいてはその電界強度、すなわち放電極と集じ
ん極（小ダクト）との間にかかる電圧を両者の距離Ｄ0
で除した値が同一となる条件で測定されている。なお、
図１および図２で示した各放電極について、放電極の長
さ方向に沿った突起部３の設置間隔ＰをそれぞれＰ＝
１．５Ｄ0としてある。FIG. 3 is a diagram showing a change in the dust collection rate of the duct type EP with respect to an increase / decrease in M when M projections are radially arranged at equal intervals along the circumferential direction of the discharge electrode. , And the curve of the small duct is A, the case of the square is B, and the case of the hexagon is C is shown by three curves. The vertical axis represents the dust collection rate, and is shown as a dust collection index normalized by setting the dust collection rate to 1 when the small duct is circular and the number of projections is four. Further, in each small duct, the electric field strength, that is, the voltage applied between the discharge electrode and the dust collecting electrode (small duct) is set to the distance D0 between them.
It is measured under the condition that the value divided by is the same. In addition,
For each discharge electrode shown in FIGS. 1 and 2, the installation interval P of the protrusions 3 along the length direction of the discharge electrode is P =
It is set to 1.5D0.
【００１４】図３において、Ａ，Ｂ，Ｃの各ケースとも
Ｍ＝４または５において集じん性能がピークとなり、Ｍ
が４より小さいとき集じん性能が極端に減少している。
小ダクトが円形断面のＡのケースにおいて、ピーク性能
の９０％以上の性能を保つためにはＭが３以上であるこ
とが必要であり、Ｍ＝１，２においては性能低下が著し
く実用に耐えない。また、Ｍ＝４または５を越えると性
能は除々に低下する。その低下の傾きは比較的小さい
が、突起部３の本数をいたずらに増加させることはコス
トの上で不利なので、Ｍ＝６以上とすることは実用上意
味がない。以上のことから、放電極の周方向に沿って等
間隔で設ける突起部の本数は３〜６本の範囲が適当であ
り、望ましくはピーク性能の得られる最低本数であるＭ
＝４が最も適している。なお図３において明らかなよう
に、Ａ，Ｂ，Ｃの各ケースともそのピーク性能の絶対値
にあまり大きな差はなく、例えばＭ＝４における正方形
断面の小ダクト４を用いた場合には、同じくＭ＝４にお
ける円形断面の小ダクト１を用いた場合の少なくとも９
０％以上の性能が期待できる。またＭ＝４の場合におい
て、小ダクト４における正方形断面の内側面に突起部３
を向けた場合（図２の（ａ）に相当）のピーク値を白抜
きのマークで、また正方形断面の対角線方向に突起部３
を向けた場合（図２の（ｂ）に相当）のピーク値を黒抜
きのマークで図中に示したが、両者の性能差はほとんど
確認できない。In FIG. 3, in each case of A, B and C, the dust collection performance peaks at M = 4 or 5, and
When is less than 4, the dust collection performance is extremely reduced.
In the case of small duct A with circular cross section, in order to maintain 90% or more of the peak performance, M must be 3 or more, and when M = 1 and 2, the performance declines remarkably and is practical. Absent. Further, when M = 4 or 5 is exceeded, the performance gradually deteriorates. The inclination of the decrease is relatively small, but it is disadvantageous in terms of cost to increase the number of the protrusions 3 in a prank manner, so setting M = 6 or more has no practical meaning. From the above, it is appropriate that the number of protrusions provided at equal intervals along the circumferential direction of the discharge electrode is in the range of 3 to 6, and it is desirable that the minimum number M that can obtain peak performance be M.
= 4 is the most suitable. As is apparent from FIG. 3, there is no great difference in the absolute value of the peak performance between A, B, and C cases. For example, when the small duct 4 having a square cross section at M = 4 is used, At least 9 when using a small duct 1 with a circular cross section at M = 4
Performance of 0% or more can be expected. When M = 4, the projection 3 is formed on the inner surface of the square cross section of the small duct 4.
The peak value in the case of pointing (corresponding to (a) in FIG. 2) is a white mark, and the projection 3
The peak value in the case of pointing (corresponding to (b) in FIG. 2) is shown by a black mark in the figure, but a performance difference between the two can hardly be confirmed.
【００１５】さて、小ダクトの形状として最も好ましい
Ｍ＝４の放電極について、これを製作するに当たって
は、放電極（支持棒）２ｂ上に、この放電極の周方向に
沿って４等分割する方向に４本の突起部３をスタッド溶
接等の手段によって固定するわけであるが、その作業性
を考えると、図４に示すように断面を矩形（正方形）と
した放電極２ｄとすることが極めて有効であることが容
易にわかる。Now, in manufacturing the discharge electrode of M = 4 most preferable as the shape of the small duct, in manufacturing this, the discharge electrode (supporting rod) 2b is divided into four equal parts along the circumferential direction of this discharge electrode. The four protrusions 3 are fixed in the direction by means such as stud welding. Considering the workability, the discharge electrode 2d having a rectangular (square) cross section may be formed as shown in FIG. It is easy to see that it is extremely effective.
【００１６】図５は、正方形断面の小ダクト４内に、上
記図４で示した矩形断面の放電極２ｄをその突起部３が
小ダクト４の対角線方向を向くように（図２（ｂ）と同
様）配置した場合について、放電極２ｄの長さ方向に沿
った突起部３の設置間隔Ｐの変化に対するダクト型ＥＰ
の集じん性能の変化を表わしている。横軸は、設置間隔
ＰをＤ0 （突起部３と小ダクト４の内面との距離）にて
無次元化したＰ／Ｄ0の形で示し、縦軸の集じん率はＰ
／Ｄ0 ＝１の場合の集じん率を１として無次元化した値
で示している。Ｐ／Ｄ0 が小さいと、突起部３が密に配
設されすぎてコロナ電流がクエンチされ、性能は低下す
る。一方、Ｐ／Ｄ0 の増大とともにＰ／Ｄ0 ＝１．２〜
１．６あたりで性能はピークに達し、それ以上になると
突起部３の配置が粗となりすぎてコロナ電流のデッドス
ペースが生じ、除々に性能が低下していく。本図より明
らかなように、ピーク時の９０％以上の性能を得るため
には、Ｐ／Ｄ0 ＝０．６〜２．４の範囲にあることが必
要であり、望ましくは集じん率がピークに達するＰ／Ｄ
0 ＝１．２〜１．６の時にダクト型ＥＰは最適なる運転
条件を得ることができる。FIG. 5 shows that the discharge electrode 2d having the rectangular cross section shown in FIG. 4 is placed in the small duct 4 having the square cross section so that the projection 3 thereof is oriented in the diagonal direction of the small duct 4 (FIG. 2 (b)). Duct type EP with respect to a change in the installation interval P of the protrusions 3 along the length direction of the discharge electrode 2d in the case of arrangement.
Represents the change in dust collection performance. The horizontal axis represents the installation interval P in the form of P / D0, which is dimensionlessized by D0 (distance between the protrusion 3 and the inner surface of the small duct 4), and the vertical axis shows the dust collection rate P.
It is shown as a dimensionless value with the dust collection rate in the case of / D0 = 1. When P / D0 is small, the projections 3 are arranged too close to each other, the corona current is quenched, and the performance deteriorates. On the other hand, as P / D0 increases, P / D0 = 1.2-
The performance reaches a peak at around 1.6, and beyond that, the disposition of the protrusions 3 becomes too rough and a dead space of corona current occurs, and the performance gradually lowers. As is clear from this figure, in order to obtain a performance of 90% or more at the peak time, it is necessary that P / D0 = 0.6 to 2.4, and it is desirable that the dust collection rate be at the peak. Reaching P / D
When 0 = 1.2 to 1.6, the duct type EP can obtain optimum operating conditions.
【００１７】このように本実施例であれば、放電極（望
ましくは円形断面を有する放電極）の周方向に沿って等
間隔に３乃至６本、好ましくは４本の突起部３を放射状
に配設するとともに、当該突起部３の先端から小ダクト
内面までの距離Ｄ0 と、当該突起部３の放電極における
長さ方向の設置間隔Ｐとの関係が０．６Ｄ0 ≦Ｐ≦２．
４Ｄ0 の範囲に、好ましくは１．２Ｄ0 ≦Ｐ≦１．６Ｄ
0 の範囲に設定されるように、上記突起部３を放電極の
長さ方向に沿って複数組配設したことにより、小ダクト
中にはコロナ電流の十分に流れないデッドゾーンを生じ
ることがなくなり、また隣接する突起部の先端から流れ
るコロナ電流が互いにクエンチされることもなくなり、
集じん効率の点からも、またコストの点からも放電極上
に突起部材を最適な配置で設けることが可能となる。こ
れにより、必要にして最小数の突起部材で良好な集じん
性能を発揮し得るダクト型電気集じん装置を提供するこ
とができる。As described above, according to this embodiment, 3 to 6, preferably 4 protrusions 3 are radially arranged at equal intervals along the circumferential direction of the discharge electrode (preferably a discharge electrode having a circular cross section). While being disposed, the relationship between the distance D0 from the tip of the protrusion 3 to the inner surface of the small duct and the installation interval P of the protrusion 3 in the lengthwise direction of the discharge electrode is 0.6D0 ≤ P ≤ 2.
In the range of 4D0, preferably 1.2D0 ≤ P ≤ 1.6D
By arranging a plurality of sets of the protrusions 3 along the length direction of the discharge electrode so as to be set in the range of 0, a dead zone where a corona current does not sufficiently flow may occur in the small duct. Also, the corona currents flowing from the tips of adjacent protrusions will not be quenched each other,
From the standpoint of dust collection efficiency and cost, it is possible to provide the protruding member on the discharge electrode in an optimal arrangement. As a result, it is possible to provide a duct type electrostatic precipitator that can exhibit good dust collecting performance with a minimum number of protruding members as necessary.
【００１８】また、突起部３を放電極の周方向に沿って
放射状に４本設ける場合には、この放電極を矩形の断面
を持つ部材とすることにより、製造工程において、突起
部３を例えばスタッド溶接等により放電極円周上に取付
ける際の作業性を著しく向上させることができる。なお
本発明は上記実施例に限定されるものではなく、本発明
の要旨を逸脱しない範囲で種々変形して実施可能であ
る。When four protrusions 3 are provided radially along the circumferential direction of the discharge electrode, the discharge electrodes are formed of a member having a rectangular cross section so that the protrusions 3 can be formed in the manufacturing process, for example. It is possible to remarkably improve workability when mounting on the circumference of the discharge electrode by stud welding or the like. The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
【００１９】[0019]
【発明の効果】以上詳述したように本発明によれば、放
電極の周方向に沿って等間隔で３乃至６本の突起部材を
放射状に配設するとともに、これらの突起部材を前記放
電極の長さ方向に沿って所定間隔で複数組配設し、且つ
当該突起部材の先端から前記小ダクト内面までの距離を
Ｄ0 、また当該突起部材の放電極における長さ方向の所
定間隔をＰとした場合に、これらの関係を０．６Ｄ0 ≦
Ｐ≦２．４Ｄ0 の範囲に設定するようにしたので、小ダ
クト中にはコロナ電流の十分に流れないデッドゾーンが
生じることはなくなり、また隣接する突起部の先端から
流れるコロナ電流が互いにクエンチされることもなくな
り、必要にして最小数の突起部材で良好な集じん性能を
発揮し得るダクト型電気集じん装置を提供できる。As described above in detail, according to the present invention, 3 to 6 projecting members are radially arranged at equal intervals along the circumferential direction of the discharge electrode, and these projecting members are released. A plurality of sets are arranged along the length direction of the electrode at predetermined intervals, and the distance from the tip of the projecting member to the inner surface of the small duct is D0, and the predetermined interval in the lengthwise direction of the projecting member in the discharge electrode is P When these relationships
Since the range of P ≦ 2.4D0 is set, the dead zone where the corona current does not flow sufficiently does not occur in the small duct, and the corona currents flowing from the tips of the adjacent protrusions are mutually quenched. It is also possible to provide a duct type electrostatic precipitator that can exhibit good dust collecting performance with a minimum number of protruding members if necessary.
【図１】本発明の一実施例に係わるダクト型電気集じん
装置で使用される小ダクトおよび放電極の構成を示す上
面図および断面図。FIG. 1 is a top view and a cross-sectional view showing configurations of a small duct and a discharge electrode used in a duct type electrostatic precipitator according to an embodiment of the present invention.
【図２】本発明の一実施例に係わるダクト型電気集じん
装置で使用される小ダクトおよび放電極の構成を示す上
面図。FIG. 2 is a top view showing a configuration of a small duct and a discharge electrode used in the duct type electrostatic precipitator according to the embodiment of the present invention.
【図３】放電極の円周に放射状に設けられた突起部の本
数に対するダクト型ＥＰの集じん率の変化を示す図。FIG. 3 is a diagram showing a change in a dust collection rate of the duct type EP with respect to the number of protrusions radially provided on the circumference of the discharge electrode.
【図４】矩形の断面を有する放電極を示す図。FIG. 4 shows a discharge electrode having a rectangular cross section.
【図５】突起部３の設置間隔Ｐの変化に対するダクト型
ＥＰの集じん性能の変化を示す図。FIG. 5 is a diagram showing a change in dust collecting performance of the duct type EP with respect to a change in an installation interval P of the protrusions 3.
【図６】従来例に係わる放電極を構成を示す図。FIG. 6 is a diagram showing a structure of a discharge electrode according to a conventional example.
１…円形断面の小ダクト、２ａ〜２ｄ…放電極、３…突
起部、４…矩形断面の小ダクト、５…六角形断面の小ダ
クト。DESCRIPTION OF SYMBOLS 1 ... Small duct of circular cross section, 2a-2d ... Discharge electrode, 3 ... Projection part, 4 ... Small duct of rectangular cross section, 5 ... Small duct of hexagonal cross section.
Claims (1)
の筒状の小ダクトと、これらの小ダクトの軸上に当該小
ダクトの長さ方向に沿って配置される棒状の放電極とを
有し、前記放電極に電圧を印加することにより前記小ダ
クトを帯電させて集じんを行なうようにしたダクト型電
気集じん装置において、 前記放電極の周方向に沿って等間隔で３乃至６本の突起
部材を配設するとともに、これらの突起部材を前記放電
極の長さ方向に沿って所定間隔で複数組配設し、且つ当
該突起部材の先端から前記小ダクト内面までの距離をＤ
0 、また当該突起部材の放電極における長さ方向の所定
間隔をＰとしたとき、これらの関係を０．６Ｄ0 ≦Ｐ≦
２．４Ｄ0 の範囲に設定したことを特徴とするダクト型
電気集じん装置。1. A plurality of tubular small ducts arranged inside a flue gas duct, and a rod-shaped discharge electrode arranged along the length direction of the small ducts on the axis of the small ducts. A duct-type electrostatic precipitator, which has a small amount of electricity and which collects dust by applying a voltage to the discharge electrode, wherein the dust collection device collects dust at equal intervals along the circumferential direction of the discharge electrode. A plurality of protruding members are arranged, and a plurality of these protruding members are arranged at predetermined intervals along the length direction of the discharge electrode, and the distance from the tip of the protruding member to the inner surface of the small duct is D.
0, and when P is a predetermined distance in the lengthwise direction of the projecting member in the discharge electrode, these relations are 0.6D0 ≤ P ≤
A duct type electrostatic precipitator characterized by being set in the range of 2.4D0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19413392A JP3174628B2 (en) | 1992-07-21 | 1992-07-21 | Duct type electrostatic precipitator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19413392A JP3174628B2 (en) | 1992-07-21 | 1992-07-21 | Duct type electrostatic precipitator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0631199A true JPH0631199A (en) | 1994-02-08 |
| JP3174628B2 JP3174628B2 (en) | 2001-06-11 |
Family
ID=16319462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19413392A Expired - Fee Related JP3174628B2 (en) | 1992-07-21 | 1992-07-21 | Duct type electrostatic precipitator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3174628B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07313901A (en) * | 1994-05-27 | 1995-12-05 | Omi Kogyo Co Ltd | Electrostatic dust collector |
| WO1997005955A1 (en) * | 1995-08-08 | 1997-02-20 | Galaxy Yugen Kaisha | Electrostatic precipitator |
| WO2013179381A1 (en) | 2012-05-29 | 2013-12-05 | トヨタ自動車株式会社 | Particulate matter treating device |
| CN104096637A (en) * | 2014-07-14 | 2014-10-15 | 双盾环境科技有限公司 | Strip cathode wire for electrostatic dust collector |
-
1992
- 1992-07-21 JP JP19413392A patent/JP3174628B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07313901A (en) * | 1994-05-27 | 1995-12-05 | Omi Kogyo Co Ltd | Electrostatic dust collector |
| WO1997005955A1 (en) * | 1995-08-08 | 1997-02-20 | Galaxy Yugen Kaisha | Electrostatic precipitator |
| US6071330A (en) * | 1995-08-08 | 2000-06-06 | Galaxy Yugen Kaisha | Electric dust collector |
| WO2013179381A1 (en) | 2012-05-29 | 2013-12-05 | トヨタ自動車株式会社 | Particulate matter treating device |
| CN104096637A (en) * | 2014-07-14 | 2014-10-15 | 双盾环境科技有限公司 | Strip cathode wire for electrostatic dust collector |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3174628B2 (en) | 2001-06-11 |
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