JP2012020285A - Electric precipitator - Google Patents
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- JP2012020285A JP2012020285A JP2011190844A JP2011190844A JP2012020285A JP 2012020285 A JP2012020285 A JP 2012020285A JP 2011190844 A JP2011190844 A JP 2011190844A JP 2011190844 A JP2011190844 A JP 2011190844A JP 2012020285 A JP2012020285 A JP 2012020285A
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- 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
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- 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
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
Description
本発明は、例えばトンネル内の空気などを浄化するのに好適な電気集じん装置に関する。 The present invention relates to an electric dust collector suitable for purifying air in a tunnel, for example.
従来から知られている通り、自動車道トンネル内の空気は、自動車から排出される排気ガス中の有害ガス、煤煙、自動車の走行に伴って生じるタイヤや道路アスファルトの磨耗粉塵などのサブミクロンオーダの浮遊微粒子で汚染されている。そこで、この汚染空気中の煤煙・微粒子を除去するために、帯電部および集じん部によって構成された二段式電気集じん装置を用いた空気浄化設備が実用化されている。 As is known in the art, the air in an expressway tunnel is in the order of submicron such as harmful gases in the exhaust gas exhausted from automobiles, soot, and tire and road asphalt wear dust generated by automobiles. Contaminated with airborne particles. Therefore, in order to remove the soot and particulates in the contaminated air, air purification equipment using a two-stage electric dust collector composed of a charging part and a dust collecting part has been put into practical use.
図１１は、一般的に知られている２段式電気集じん装置の構成を示す。本図に示す電気集じん装置１００は、帯電部１と集じん部２から構成されている。帯電部１は、線−平板電極構造であり、１対の平板からなる接地電極３ａ，３ｂと、線状の高電圧電極４を有している。そして、電極間には直流高電圧を印加し、コロナ放電を発生させている。一方、集じん部２は平行平板電極構造であり、1対の平行平板からなる接地電極５ａ，５ｂと、１枚の平板からなる高電圧電極６を有している。この平行平板電極間に直流高電圧を印加することにより、静電界が形成される。これらの構成をもつ２段式電気集じん装置において、粒子は帯電部１において単極性に帯電し、集じん部２の静電界によって、接地電極５ａ，５ｂ上に捕集される。 FIG. 11 shows a configuration of a generally known two-stage type electric dust collector. An electric dust collector 100 shown in the figure includes a charging unit 1 and a dust collecting unit 2. The charging unit 1 has a wire-plate electrode structure, and includes ground electrodes 3 a and 3 b made of a pair of flat plates and a linear high-voltage electrode 4. A high DC voltage is applied between the electrodes to generate corona discharge. On the other hand, the dust collecting portion 2 has a parallel plate electrode structure, and has ground electrodes 5a and 5b made of a pair of parallel plates and a high voltage electrode 6 made of a single plate. An electrostatic field is formed by applying a DC high voltage between the parallel plate electrodes. In the two-stage electrostatic precipitator having these configurations, the particles are unipolarly charged in the charging unit 1 and are collected on the ground electrodes 5 a and 5 b by the electrostatic field of the dust collecting unit 2.
このような従来型の二段式電気集じん装置は、ナノメータ粒子に対しても集じん率が高く、また大流量処理に適している。
しかし、自動車道路トンネル内のように、浮遊粒子の主成分が、電気抵抗の低いカーボンなどである場合、集じん電極上に捕集された粒子が、再び飛散し、ガス流と共に電気集じん装置から排出される場合がある。この現象は再飛散現象と呼ばれている。再飛散現象は、大粒径粒子の集じん率を低下させるため、改善すべき大きな課題となっている。
Such a conventional two-stage electrostatic precipitator has a high dust collection rate even with respect to nanometer particles, and is suitable for a large flow rate treatment.
However, if the main component of the suspended particles is carbon with low electrical resistance, as in an automobile road tunnel, the particles collected on the dust collection electrode will be scattered again and be collected together with the gas flow. May be discharged from. This phenomenon is called a re-scattering phenomenon. The re-scattering phenomenon is a big problem to be improved because it reduces the dust collection rate of the large particles.
再飛散現象のメカニズムを図１２に基づいて説明する。なお、図１２の説明においては、粒子は帯電部において負に単極帯電されるものとする。
まず、図１２の（Ａ）に示すように、帯電部内で負極性に帯電した粒子９は、集じん部接地電極８上に捕集される。接地電極８上に集じんされた粒子９は、直ちに電荷を失い接地極と同極性となる。このため、接地電極８上の集じん粒子９の近傍は電界が強くなる。さらに（Ｂ）に示すように、空間中の負極性帯電粒子９が接地電極８上に集じんされるとき、接地電極８上の粒子１０と凝集するとともに、電界によるクーロン力によって、負極性の高電圧電極７方向へ数珠状凝集粒子１０を形成する。接地電極８上の数珠状凝集粒子１０は凝集肥大化するに従い（図１２（Ｃ）参照）、流体抗力やクーロン力などの剥離力が強くなり、これらの力が接地電極８と凝集粒子１０間の付着力より大きくなったとき再飛散する。
The mechanism of the re-scattering phenomenon will be described with reference to FIG. In the description of FIG. 12, it is assumed that the particles are negatively monopolarly charged in the charging unit.
First, as shown in FIG. 12A, the particles 9 that are negatively charged in the charging portion are collected on the dust collection portion ground electrode 8. The particles 9 collected on the ground electrode 8 immediately lose their charge and have the same polarity as the ground electrode. For this reason, the electric field becomes strong in the vicinity of the dust collection particles 9 on the ground electrode 8. Further, as shown in (B), when the negatively charged particles 9 in the space are collected on the ground electrode 8, they aggregate with the particles 10 on the ground electrode 8, and are negatively charged by the Coulomb force due to the electric field. The bead-like aggregated particles 10 are formed in the direction of the high voltage electrode 7. As the bead-like aggregated particles 10 on the ground electrode 8 are agglomerated and enlarged (see FIG. 12C), peeling force such as fluid drag and Coulomb force becomes stronger, and these forces are generated between the ground electrode 8 and the aggregated particles 10. When it becomes larger than the adhesion force, it re-scatters.
かかる再飛散現象を極めて有効に防止する方法として、矩形波交流電気集じん装置が提案されている。（特許文献１）
図１３は、矩形波交流電気集じん装置の概略構成を示す。本装置は、帯電部４０と集じん部５０から構成されている。帯電部４０は線−平板電極構造であり、１対の平板からなる接地電極２１，２２と、線状の高電圧電極２３を有する。この線−平板電極間に高電圧電源２０から直流高電圧を印加し、帯電部４０にコロナ放電を発生させる。直流高電圧の極性は正または負のいずれでも良く、またパルス電圧でもよい。
As a method for effectively preventing such a re-scattering phenomenon, a rectangular wave AC electrostatic precipitator has been proposed. (Patent Document 1)
FIG. 13 shows a schematic configuration of a rectangular wave AC electrostatic precipitator. This apparatus includes a charging unit 40 and a dust collection unit 50. The charging unit 40 has a wire-plate electrode structure, and includes grounding electrodes 21 and 22 composed of a pair of flat plates and a linear high voltage electrode 23. A DC high voltage is applied from the high voltage power supply 20 between the wire and the plate electrode to cause the charging unit 40 to generate corona discharge. The polarity of the DC high voltage may be positive or negative, and may be a pulse voltage.
集じん部５０は平行平板電極構造であり、１対の平板からなる接地電極３１，３２と、１枚の平板からなる高電圧電極３３とを有する。この接地−高電圧電極間には、矩形波高電圧電源３０から矩形波高電圧を印加する。なお、矩形波高電圧電源３０の代わりに正弦波交流からなる交流高電圧電源を用いても良い。この種の矩形波高電圧電源の電圧範囲は、電極間１ｍｍあたり３ｋＶ以下が適当であり、一般には１ｍｍあたり約０．９ｋＶ程度である。また、印加電圧の周波数は数ｋＨｚ以下の範囲とされており、周波数の下限値は限定されないが、数Ｈｚ〜０．１Ｈｚ程度とするのが良いとされている。 The dust collection part 50 has a parallel plate electrode structure, and includes ground electrodes 31 and 32 made of a pair of flat plates and a high voltage electrode 33 made of one flat plate. A rectangular wave high voltage is applied from the rectangular wave high voltage power supply 30 between the ground and the high voltage electrode. Instead of the rectangular wave high voltage power supply 30, an AC high voltage power supply composed of a sinusoidal alternating current may be used. The voltage range of this type of rectangular wave high voltage power supply is suitably 3 kV or less per 1 mm between electrodes, and is generally about 0.9 kV per 1 mm. Further, the frequency of the applied voltage is in the range of several kHz or less, and the lower limit value of the frequency is not limited, but it is considered to be about several Hz to about 0.1 Hz.
ここで、集じん部に矩形波高電圧を印加した場合の再飛散防止メカニズムを図１４、図１５に基づいて説明する。なお、帯電部４０（図１３参照）には負の直流高電圧が印加され、粒子はマイナスに帯電されているものとする。 Here, the re-scattering prevention mechanism when a rectangular wave high voltage is applied to the dust collection portion will be described with reference to FIGS. It is assumed that a negative DC high voltage is applied to the charging unit 40 (see FIG. 13) and the particles are negatively charged.
図１５は、集じん部に印加される矩形波高電圧の波形を示している。図１５においては、集じん部に印加される電圧を3つの区間に分けて考えられている。ａの区間は、集じん部に正の高電圧が印加されている領域である。ｂの区間は、集じん部への印加電圧が、正から負に変化した瞬間である。ｃの区間は、集じん部に負の高電圧が印加されている領域である。 FIG. 15 shows a waveform of a rectangular high voltage applied to the dust collection portion. In FIG. 15, the voltage applied to the dust collector is considered divided into three sections. The section “a” is an area where a positive high voltage is applied to the dust collection portion. The interval b is the moment when the applied voltage to the dust collection portion changes from positive to negative. The section c is a region where a negative high voltage is applied to the dust collection portion.
矩形波高電圧が領域ａのとき、帯電部で負に帯電した粒子は、図１４（Ａ）に示すように正極性の高電圧集じん電極板上に捕集される。捕集された粒子は、直ちに負から正に帯電し、数珠状の極板凝集粒子を形成する。次に、矩形波高電圧が領域ｂになると、電圧の極性が正から負に急激に変化するため、集じん電極板の極性も正から負に急激に変化し、数珠状の極板凝集粒子は、図１４（Ｂ）に示すように静電界によって集じん電極板方向へ力を受け、矩形波高電圧が領域ｃになると、図１４（Ｃ）に示すように球状の凝集粒子へと変化すると言われている。球状の凝集粒子に変化することによって、剥離力として働く風力や静電気が小さくなり、再飛散は起こらなくなる。
しかし、従来の矩形波電圧は、正極性高電圧および負極性高電圧をＧＮＤレベルに対して対称に出力されているため、高電圧発生装置の構造が複雑になるという課題があった。
すなわち、正極性高電圧および負極性高電圧をＧＮＤレベルに対して対称に出力するためには、高電圧発生装置内に、正極性直流高電圧発生回路及び負極性高電圧発生回路を各々設けるようにしなければならないため、構造が複雑にならざるを得なかった。
However, since the conventional rectangular wave voltage outputs the positive high voltage and the negative high voltage symmetrically with respect to the GND level, there is a problem that the structure of the high voltage generator is complicated.
That is, in order to output the positive high voltage and the negative high voltage symmetrically with respect to the GND level, a positive direct current high voltage generation circuit and a negative high voltage generation circuit are provided in the high voltage generator. Therefore, the structure has to be complicated.
また、帯電部に正負対称の矩形波高電圧を印加すると、正極性および負極性コロナ放電の放電特性が異なるため、集じん性能が低下するという課題もあった。すなわち、同一構造の電気集じん装置の帯電部に高電圧を印加する場合、印加電圧の絶対値が同一であっても、正極性高電圧を印加した時よりも負極性高電圧を印加した時の方が放電電流は大きくなる。このため、負極性コロナ放電時の方が、粒子の帯電量が大きくなり集じん率は高くなる。コロナ放電の電圧特性に対する極性依存性を図１６の特性図に示す。図１６は、図１７に示す帯電部の実験装置で実験を行った特性図である。図１７の帯電部の実験装置は、タングステン製の線電極と、アルミニウム製の平板電極が交互に並んだ構造となっており、これらの電極間に高電圧を印加した。図１６では、縦軸にコロナ放電電流Ｉｄ、横軸に印加電圧Ｖｐが目盛られており、正極性コロナ放電時に比べて、負極性コロナ放電電流が大きいことが分かる。 In addition, when a positive and negative symmetric rectangular wave high voltage is applied to the charging portion, the discharge characteristics of the positive and negative corona discharges are different, which causes a problem that dust collection performance is deteriorated. That is, when a high voltage is applied to the charging part of an electrostatic precipitator with the same structure, even when the applied voltage has the same absolute value, when a negative high voltage is applied than when a positive high voltage is applied This increases the discharge current. For this reason, in the case of negative corona discharge, the charge amount of particles becomes larger and the dust collection rate becomes higher. The polarity dependence on the voltage characteristics of corona discharge is shown in the characteristic diagram of FIG. FIG. 16 is a characteristic diagram in which an experiment is performed using the charging unit experimental apparatus illustrated in FIG. 17 has a structure in which tungsten wire electrodes and aluminum plate electrodes are alternately arranged, and a high voltage is applied between these electrodes. In FIG. 16, the vertical axis indicates the corona discharge current Id, and the horizontal axis indicates the applied voltage Vp. It can be seen that the negative corona discharge current is larger than that during positive corona discharge.
上記課題を解決するために、本発明によれば、空気中に浮遊する粒子に帯電部にて電荷を与え、該電荷が与えられた粒子に集じん部で電界を加えることによって、前記浮遊粒子による数珠状の板極凝縮粒子を引き倒して粒子の形状を変化させて集じんを行う電気集じん装置において、集じん部の電極に高電圧を印加する手段として、負極性または正極性の高電圧が、周期的に瞬時に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性または正極性の高電圧である構成とする。 In order to solve the above-described problem, according to the present invention, a particle is suspended in the air by applying a charge to the charged part, and an electric field is applied to the particle to which the charge has been applied, thereby collecting the suspended particle. In an electrostatic precipitator that collects particles by changing the shape of the particles by pulling down the bead-shaped plate electrode condensate particles, the negative polarity or positive polarity The voltage is configured to be a negative or positive high voltage in which the output voltage is periodically and instantaneously lowered to 0 V and the output voltage is restored again.
また、帯電部の高電圧発生手段は、負極性または正極性の高電圧が、周期的に瞬時に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性または正極性の高電圧である構成とする。 Further, the high voltage generating means of the charging unit is a negative or positive high voltage in which the negative or positive high voltage is periodically and instantaneously the output voltage drops to 0 V and the output voltage is restored again. The configuration.
帯電部の高電圧発生手段として、負極性または正極性の高電圧が、周期的に瞬時に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性または正極性の高電圧を印加する高電圧発生手段を用いる場合には、帯電部および集じん部に対して共通に設ける構成とすることができる。 As a high voltage generating means for the charging unit, a negative or positive high voltage is applied, and a negative or positive high voltage is applied that periodically and instantaneously decreases the output voltage to 0 V and restores the output voltage again. When the voltage generating means is used, it can be configured to be provided in common for the charging unit and the dust collection unit.
さらに、放電電極と集じん電極との空間で空気中に浮遊する粒子の荷電と集じんを同時に行ない、前記浮遊粒子による数珠状の板極凝縮粒子を引き倒して粒子の形状を変化させて集じんする一段式電気集じん装置において、放電電極と集じん電極とに高電圧を印加する手段として、負極性または正極性の高電圧が、周期的に瞬時に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性または正極性の高電圧を印加する高電圧発生手段を用いる構成とする。 In addition, the particles floating in the air are charged and collected simultaneously in the space between the discharge electrode and the dust collection electrode, and the beads are condensed by pulling down the bead-shaped plate electrode condensate particles to change the shape of the particles. As a means for applying a high voltage to the discharge electrode and the dust collection electrode in a dusty one-stage electrostatic precipitator, a negative or positive high voltage is periodically and instantaneously the output voltage drops to 0 V, and again High voltage generating means for applying a negative or positive high voltage for restoring the output voltage is used.
さらに、上記の電気集じん装置において、正負非対称の任意波形の高電圧は、その周波数が０．０１〜１０Ｈｚである構成とする。 Furthermore, in the above-described electrostatic precipitator, the high voltage of an arbitrary waveform having a positive / negative asymmetric shape has a frequency of 0.01 to 10 Hz.
本発明によれば、電気集じん装置の集じん部の高電圧電源として、負極性または正極性の高電圧が、周期的に瞬時に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性または正極性の高電圧を発生させる電源を用いることにより、高電圧発生装置をシンプルな構成にすることができる。また、帯電部にも同様の高電圧を用いることにより、帯電部の高電圧発生装置をシンプルな構成にすることができ、高い集じん性能を維持したまま再飛散を効果的に抑制することができる。 According to the present invention, as a high-voltage power source for a dust collector of an electric dust collector, a negative or positive high voltage is a negative electrode whose output voltage is periodically and instantaneously reduced to 0 V and the output voltage is restored again. By using a power source that generates a positive or positive high voltage, the high voltage generator can have a simple configuration. In addition, by using the same high voltage for the charging unit, the high voltage generator of the charging unit can be made simple, and re-scattering can be effectively suppressed while maintaining high dust collection performance. it can.
図１は、本発明による交流電界形電気集じん装置の構成図であり、図１１に示した従来の電気集じん装置と同じ構成要素には同じ符号を付与している。図１に示す本発明による電気集じん装置が、図１１に示す従来の電気集じん装置と異なる点は、集じん部５０の高電圧電源として、負側の割合が多い正負非対称の任意波形の高電圧を発生させることのできる高電圧電源６０が用いられている点である。 FIG. 1 is a configuration diagram of an AC electric field type electrostatic precipitator according to the present invention, and the same reference numerals are given to the same components as those of the conventional electrostatic precipitator shown in FIG. The electrostatic precipitator according to the present invention shown in FIG. 1 is different from the conventional electrostatic precipitator shown in FIG. 11 in that the high voltage power source of the dust collector 50 has a positive and negative asymmetric arbitrary waveform with a large negative ratio. The high voltage power supply 60 which can generate a high voltage is used.
この高電圧電源６０は、正極性直流高電圧発生回路容量を小さく、または正極性直流高電圧発生回路を削除した構成とすることができる。このため、正極性高電圧および負極性高電圧をＧＮＤレベルに対して対称に出力する従来の高電圧電源と比較して、構成を簡単にすることができる。 The high voltage power supply 60 can be configured such that the positive direct current high voltage generating circuit capacity is reduced or the positive direct current high voltage generating circuit is omitted. For this reason, compared with the conventional high voltage power supply which outputs a positive high voltage and a negative high voltage symmetrically with respect to a GND level, a structure can be simplified.
帯電部は、図１１と同様に線−平板電極構造であり、1対の平板からなる接地電極２１、２２と、線状の高圧電極２３を有する。集じん部５０も図１１と同様に、1対の平板からなる接地電極３１、３２と1枚の平板からなる高電圧電極３３とを有する。 The charging unit has a line-plate electrode structure as in FIG. 11, and includes grounding electrodes 21 and 22 made of a pair of plates and a linear high-voltage electrode 23. Similarly to FIG. 11, the dust collection portion 50 also includes ground electrodes 31 and 32 made of a pair of flat plates and a high voltage electrode 33 made of a single flat plate.
図２は、図１に記載されている高電圧電源６０から発生される任意波形高電圧の一例の説明図である。本発明の電気集じん装置では、図２に示すように正極性時の電圧値Ｖ＋と、負極性時の電圧値Ｖ−は任意に設定することができ、電圧値Ｖ＋とＶ−の絶対値は等しくなくても良く、Ｖ−の絶対値をＶ＋の絶対値よりも大きくすることにより、高電圧電源の構成を簡略化することができる。また、図２に示す電圧波形の時間軸に関しては、ｔ0〜ｔ6は任意に設定することができる。特に、ｔ2−ｔ1は、ｔ5−ｔ4と等しくしなくても良い。さらに、ｔ0〜ｔ1、ｔ2〜ｔ4、ｔ5〜ｔ6における電圧の時間的変化ｄＶ／ｄｔは、 直線的、指数関数的でも良いし、任意である。 FIG. 2 is an explanatory diagram of an example of an arbitrary waveform high voltage generated from the high voltage power supply 60 shown in FIG. In the electric dust collector of the present invention, as shown in FIG. 2, the voltage value V + at the time of positive polarity and the voltage value V− at the time of negative polarity can be arbitrarily set, and the absolute value of the voltage values V + and V−. May not be equal, and by making the absolute value of V− larger than the absolute value of V +, the configuration of the high-voltage power supply can be simplified. Further, t0 to t6 can be arbitrarily set with respect to the time axis of the voltage waveform shown in FIG. In particular, t2−t1 may not be equal to t5−t4. Furthermore, the temporal change dV / dt of the voltage at t0 to t1, t2 to t4, and t5 to t6 may be linear, exponential, or arbitrary.
以下、実験結果を用いて、本発明の効果について説明する。
図３は従来において用いられている正負対称の矩形波交流高電圧の波形図であり、図４は本発明において用いられる任意波形の高電圧の波形図であり、正極側の電圧をゼロとした負極性台形波である。なお、図３、図４においては、電圧の立上り、立下りをｄＶ／ｄｔ＝５００Ｖ／ｍｓｅｃとしている。
Hereinafter, the effects of the present invention will be described using experimental results.
FIG. 3 is a waveform diagram of a positive and negative symmetrical rectangular wave AC high voltage used in the prior art, and FIG. 4 is a waveform diagram of an arbitrary waveform high voltage used in the present invention, with the positive side voltage being zero. Negative trapezoidal wave. In FIGS. 3 and 4, the voltage rise and fall are set to dV / dt = 500 V / msec.
図３の正負対称の矩形波交流高電圧を印加した場合の集じん率の時間変化を図５、図４の任意波形の高電圧４を印加した場合の集じん率の時間変化を図６に示す。なお、集じん率は、流入側の粒子濃度に対する流出側の粒子濃度の割合である。 FIG. 5 shows the time variation of the dust collection rate when the positive and negative symmetric rectangular wave AC high voltage of FIG. 3 is applied, and FIG. 6 shows the time variation of the dust collection rate when the high voltage 4 of the arbitrary waveform of FIG. 4 is applied. Show. The dust collection rate is the ratio of the particle concentration on the outflow side to the particle concentration on the inflow side.
図５、図６の実験結果は、帯電部と集じん部の電極長さの和を８１６ｍｍ、送風機の風速を９ｍ／ｓｅｃ、帯電部の印加電圧をＤＣ−１１ｋＶ、帯電部の電流を２．４８ｍＡ，集じん部の印加電圧を―８ｋＶ、温度２７℃、湿球温度２３．５℃の条件で実験したものである。 5 and 6 show that the sum of the electrode lengths of the charging part and the dust collecting part is 816 mm, the wind speed of the blower is 9 m / sec, the applied voltage of the charging part is DC-11 kV, and the current of the charging part is 2. The experiment was performed under the conditions of 48 mA, the applied voltage of the dust collection part being −8 kV, the temperature 27 ° C., and the wet bulb temperature 23.5 ° C.
正負対称の矩形波交流高電圧の実験結果である図５では、粒径０．３〜１μｍの粒子は、集じん装置稼動後の集じん率は一定を示している。しかし、粒径１〜５μｍの粒子は、稼動時間の経過に従い、集じん率は徐々に低下しているのがわかる。この原因は、再飛散現象である。 In FIG. 5, which is an experimental result of positive and negative symmetrical rectangular wave AC high voltage, particles having a particle size of 0.3 to 1 μm show a constant dust collection rate after the dust collector operation. However, it can be seen that the particles having a particle diameter of 1 to 5 μm gradually decrease in the dust collection rate as the operation time elapses. This is due to the re-scattering phenomenon.
これに対して、本発明による任意波形の高電圧を用いた場合には、図６に示すように、粒径１〜５μｍの粒子でも集じん装置稼動後の集じん率は一定を示している。これは、次の理由による。すなわち、図４に示す波形の印加電圧は、周期的に印加電圧をＧＮＤレベルに低下させており、この時、捕集粒子は接地電極方向に引き倒される。このため、捕集粒子の形状が変化し、粒径が大きくなる。よって、捕集粒子と電極との接触点が多くなり付着力が強くなるためである。また、捕集粒子の形状が変化し、ガス流の影響を受けにくく剥離しにくくなるためである。 On the other hand, when a high voltage having an arbitrary waveform according to the present invention is used, the dust collection rate after operation of the dust collector is constant even for particles having a particle size of 1 to 5 μm, as shown in FIG. . This is due to the following reason. That is, the applied voltage having the waveform shown in FIG. 4 periodically reduces the applied voltage to the GND level, and at this time, the collected particles are pulled down toward the ground electrode. For this reason, the shape of the collected particles changes and the particle size becomes large. Therefore, the number of contact points between the collected particles and the electrode is increased, and the adhesion is increased. Moreover, it is because the shape of the collected particles changes, and it is difficult to be peeled off due to the influence of the gas flow.
図７は集じん部の高電圧電源として矩形波電源、任意波形電源、直流電源を用いた場合の集じん率の粒径特性を示したものであり、縦軸に集じん率、横軸に粒径が目盛られている。図７に示すように、直流電源では、粒径が大きいほど集じん率は低下するが、任意波形電源では、何れの粒径においても高い集じん率を維持している。また、任意波形電源の集じん率は、矩形波電源の場合とほぼ同等である。 FIG. 7 shows the particle size characteristics of the dust collection rate when a rectangular wave power source, an arbitrary waveform power source, and a DC power source are used as a high voltage power source for the dust collection part. The vertical axis represents the dust collection rate and the horizontal axis represents the dust collection rate. The particle size is graduated. As shown in FIG. 7, in the DC power source, the dust collection rate decreases as the particle size increases, but the arbitrary waveform power source maintains a high dust collection rate at any particle size. Further, the dust collection rate of the arbitrary waveform power supply is almost the same as that of the rectangular wave power supply.
以上の説明においては、集じん部の高電圧電源として任意波形電源を用いた場合について説明したが、任意波形電源は集じん部の高電圧電源だけでなく、図８に示すように帯電部の高電圧電源として用いても良いことは勿論である。図８においては、図１と同じ構成要件は同じ符号で示されているが、図１と相違するのは、図１の高電圧電源２０の代わりに任意波形の高電圧電源７０が用いられている点である。 In the above description, the case where an arbitrary waveform power source is used as the high voltage power source of the dust collection unit has been described. However, the arbitrary waveform power source is not limited to the high voltage power source of the dust collection unit, and as shown in FIG. Of course, it may be used as a high voltage power source. In FIG. 8, the same constituent elements as those in FIG. 1 are denoted by the same reference numerals. However, the difference from FIG. 1 is that a high voltage power supply 70 having an arbitrary waveform is used instead of the high voltage power supply 20 in FIG. It is a point.
また、図８のように帯電部の高電圧電源として任意波形電源を用いる場合には、図９に示すように帯電部と集じん部に共通の高電圧電源８０を用いることも可能である。
さらに、放電電極と集じん電極との空間でダストの荷電と集じんを同時に行う一段式電気集じん装置の場合にも、図１０に示すように任意波形電源７０を用いることができる。
Further, when an arbitrary waveform power source is used as the high voltage power source of the charging unit as shown in FIG. 8, a common high voltage power source 80 can be used for the charging unit and the dust collecting unit as shown in FIG.
Further, in the case of a one-stage electric dust collector that simultaneously charges and collects dust in the space between the discharge electrode and the dust collector electrode, an arbitrary waveform power source 70 can be used as shown in FIG.
なお、以上の実施の形態の説明では、正負非対称の任意波形の高電圧として、負側の割合が多い高電圧の例について説明したが、正側の割合が多い高電圧を用いても、極性が変わるだけであり、再飛散を効果的に抑制することができると共に、負極性直流高電圧発生回路容量を小さくできる、または負極性直流高電圧発生回路を削除することができる。このため、正極性高電圧および負極性高電圧をＧＮＤレベルに対して対称に出力する従来の高電圧電源と比較して、構成を簡単にすることができるという効果を達成することができる。 In the above description of the embodiment, an example of a high voltage with a large negative ratio has been described as a high voltage with a positive and negative asymmetric arbitrary waveform. As a result, re-scattering can be effectively suppressed, and the negative-polarity DC high-voltage generation circuit capacity can be reduced, or the negative-polarity DC high-voltage generation circuit can be eliminated. Therefore, it is possible to achieve an effect that the configuration can be simplified as compared with the conventional high voltage power supply that outputs the positive high voltage and the negative high voltage symmetrically with respect to the GND level.
１、４０・・・帯電部
２、５０・・・集じん部
３ａ，３ｂ，５ａ，５ｂ，８，２１，２２，３１，３２・・・接地電極
４、６、７，２３、３３・・・高電圧電極
９・・・粒子
３０・・・矩形波高電圧電源
６０、７０・・・任意波形の高電圧電源
1, 40 ... Charging part
2, 50 ... Dust collection part
3a, 3b, 5a, 5b, 8, 21, 22, 31, 32... Ground electrode
4, 6, 7, 23, 33 ... high voltage electrode
9 ... Particles
30 ... rectangular wave high voltage power supply
60, 70 ... Arbitrary waveform high voltage power supply
Claims (8)
前記集じん部の電極に高電圧を印加する手段として、負極性直流高電圧発生回路を有し、負極性の高電圧が周期的に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性の高電圧を発生する第１の高電圧発生手段を用いることを特徴とする電気集じん装置。 By applying a charge to the particles floating in the air at the charged portion and applying an electric field at the dust collecting portion to the charged particles, the bead-like plate electrode condensed particles by the floating particles are pulled down, and the particles In an electric dust collector that collects dust by changing its shape,
As a means for applying a high voltage to the electrode of the dust collection part, a negative DC high voltage generating circuit is provided, and the negative high voltage periodically decreases the output voltage to 0 V and the output voltage is restored again. An electric dust collector using a first high voltage generating means for generating a high voltage.
前記集じん部の電極に高電圧を印加する手段として、正極性直流高電圧発生回路を有し、正極性の高電圧が周期的に出力電圧が０Ｖに低下し、再び出力電圧を復帰する正極性の高電圧を発生する第２の高電圧発生手段を用いることを特徴とする電気集じん装置。 By applying a charge to the particles floating in the air at the charged portion and applying an electric field at the dust collecting portion to the charged particles, the bead-like plate electrode condensed particles by the floating particles are pulled down, and the particles In an electric dust collector that collects dust by changing its shape,
As a means for applying a high voltage to the electrode of the dust collecting portion, a positive direct current high voltage generating circuit is provided, and the positive high voltage periodically decreases the output voltage to 0 V and the output voltage is restored again. An electric dust collector using second high voltage generating means for generating a high voltage.
前記帯電部の電極に高電圧を印加する手段として、負極性直流高電圧発生回路を有し、負極性の高電圧が周期的に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性の高電圧を発生する第３の高電圧発生手段を用いることを特徴とする電気集じん装置。 The electric dust collector according to claim 1 or 2,
As means for applying a high voltage to the electrode of the charging unit, a negative polarity DC high voltage generating circuit is provided, and the negative polarity high voltage periodically decreases the output voltage to 0 V, and the output voltage is restored again. An electric dust collector using third high voltage generating means for generating a high voltage.
前記帯電部の電極に高電圧を印加する手段として、正極性直流高電圧発生回路を有し、正極性の高電圧が周期的に出力電圧が０Ｖに低下し、再び出力電圧を復帰する正極性の高電圧を発生する第４の高電圧発生手段を用いることを特徴とする電気集じん装置。 The electric dust collector according to claim 1 or 2,
As a means for applying a high voltage to the electrode of the charging unit, a positive direct current high voltage generating circuit is provided, and the positive high voltage periodically decreases the output voltage to 0 V and returns the output voltage again. An electric dust collector using a fourth high voltage generating means for generating a high voltage.
前記帯電部の高電圧発生手段として、前記集じん部の高電圧発生手段を共通に用いることを特徴とする電気集じん装置。 The electric dust collector according to claim 1 or 2,
The electrostatic precipitator according to claim 1, wherein the high voltage generator of the dust collector is commonly used as the high voltage generator of the charging unit.
前記放電電極と集じん電極とに高電圧を印加する手段として、負極性直流高電圧発生回路を有し、負極性の高電圧が周期的に出力電圧が０Ｖに低下し、再び出力電圧を復帰する負極性の高電圧を発生する第５の高電圧発生手段を用いることを特徴とする電気集じん装置。 In the space between the discharge electrode and the dust collection electrode, the particles floating in the air are charged and collected at the same time, and the beads are collected by changing the shape of the particles by pulling down the bead-shaped condensate particles. In a single-stage electric dust collector,
As a means for applying a high voltage to the discharge electrode and the dust collection electrode, a negative direct current high voltage generation circuit is provided. The negative high voltage periodically drops to 0 V, and the output voltage is restored again. An electric dust collector using fifth high voltage generating means for generating negative high voltage.
前記放電電極と集じん電極とに高電圧を印加する手段として、正極性直流高電圧発生回路を有し、正極性の高電圧が周期的に出力電圧が０Ｖに低下し、再び出力電圧を復帰する正極性の高電圧を発生する第６の高電圧発生手段を用いることを特徴とする電気集じん装置。 In the space between the discharge electrode and the dust collection electrode, the particles floating in the air are charged and collected at the same time, and the beads are collected by changing the shape of the particles by pulling down the bead-shaped condensate particles. In a single-stage electric dust collector,
As a means for applying a high voltage to the discharge electrode and the dust collecting electrode, a positive direct current high voltage generation circuit is provided. The positive high voltage periodically decreases the output voltage to 0 V, and the output voltage is restored again. An electric dust collector using sixth high voltage generating means for generating positive high voltage.
前記正負非対称の任意波形の高電圧は、その周波数が０．０１〜１０Ｈｚであることを特徴とする電気集じん装置。
The electric dust collector according to any one of claims 1 to 7,
The positive and negative asymmetric high-voltage arbitrary voltage has a frequency of 0.01 to 10 Hz.
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| JPS57102248A (en) * | 1980-12-18 | 1982-06-25 | Ube Ind Ltd | Method and device for electric dust precipitation |
| JP2000005632A (en) * | 1998-06-24 | 2000-01-11 | Hiruta Kogyo Co Ltd | Air cleaner |
| JP2004121987A (en) * | 2002-10-02 | 2004-04-22 | Fuji Electric Holdings Co Ltd | Ac electric field precipitator and method for driving the electric precipitator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102248A (en) * | 1980-12-18 | 1982-06-25 | Ube Ind Ltd | Method and device for electric dust precipitation |
| JP2000005632A (en) * | 1998-06-24 | 2000-01-11 | Hiruta Kogyo Co Ltd | Air cleaner |
| JP2004121987A (en) * | 2002-10-02 | 2004-04-22 | Fuji Electric Holdings Co Ltd | Ac electric field precipitator and method for driving the electric precipitator |
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