EP1824602B1 - Verfahren und vorrichtung zur selbstreinigung und spannungsabhängigen elektrostatischen filterung - Google Patents

Verfahren und vorrichtung zur selbstreinigung und spannungsabhängigen elektrostatischen filterung Download PDF

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Publication number
EP1824602B1
EP1824602B1 EP05847318A EP05847318A EP1824602B1 EP 1824602 B1 EP1824602 B1 EP 1824602B1 EP 05847318 A EP05847318 A EP 05847318A EP 05847318 A EP05847318 A EP 05847318A EP 1824602 B1 EP1824602 B1 EP 1824602B1
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EP
European Patent Office
Prior art keywords
cleaning
voltage
tube
electrode
dust
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Active
Application number
EP05847318A
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English (en)
French (fr)
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EP1824602A1 (de
Inventor
Florent Lemort
Jean-Claude Kneib
Olivier Laurent
Stéphane BANCEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/74—Cleaning the electrodes
    • B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact

Definitions

  • the invention relates to the field of industrial installations generating toxic or non-toxic dusts, such as particles suspended in a fluid. This is the case for thermal treatment processes for hazardous materials, such as organic nuclear waste, toxic industrial waste or hazardous raw materials. It also relates to the field of electromagnetic filtration devices.
  • the former use effective physical and mechanical barriers, such as bag filters, bag filters and granular filters, but generate pressure drops in the circuits of the installation that can be detrimental to the proper functioning of the processes.
  • the filtration temperature is limited by the nature of the filtering structures, such as felts, Teflon, etc.
  • Fluid systems are related to washing systems in which the dust is recovered in a fluid. They are also very efficient and generate little pressure loss, but produce a large quantity of contaminated or toxic fluids that must be treated downstream. In the case of a process generating toxic gases, the downstream implementation of an additional process for treating these emissions greatly degrades the interest of this type of technique.
  • Electrostatic filtration is one of these techniques and has long been exploited essentially in parallelepipedal geometries. In this type of device, it is necessary to carry out the cleaning called "unclogging" of the filtering elements generally using hammers coming to tap on metal parts of the installation, thus making it possible to pick up dust.
  • the object of the invention is to overcome these disadvantages by proposing a type of cleaning different from those mentioned above and to ensure the system operation at optimum tension.
  • a first main object of the invention is an electrostatic filtration method, with a rigid electrode placed in a tube.
  • the cleaning of the interior of the device consists in diffusing sound waves inside the tube.
  • the extraction and the direct recovery of the dust are carried out.
  • a particular case of the latter consists in simultaneously proceeding to the diffusion of the sound waves and the aspiration of the particles.
  • control means are available to control the voltage of the high-voltage electrode as a function of the number of arcs emitted, it is envisaged to automate the process by triggering the cleaning from a determined low threshold of the voltage used in the electrode.
  • a particular implementation of this method consists in fluidically placing several tubes in parallel and cleaning them alternately by circular permutation.
  • a second main object of the invention is an electrostatic filtration device with a rigid electrode placed in a tube.
  • a sound generator placed at one end of the tube is used to produce sound waves inside the tube and the electrode if the latter is hollow.
  • this sound generator has a metal divergent.
  • the assembly is advantageously completed by an inlet valve on the inlet and an outlet valve on the outlet, a purge inlet valve on the outlet and a purge outlet valve on a cleaning pipe placed at the bottom of the tube, upstream of a retention chamber and an extractor.
  • the implementation of the method using several tubes in parallel provides for feeding them by a distribution clarinet and recovering the fluid at the outlet of the tubes by a recovery clarinet, the dust collection assembly consisting of the recovery chamber and the extractor can be common to all tubes.
  • the method and the filtration device take the conventional tubular structure in which a fluid loaded with dust and introduced by an inlet 1 placed in the lower part of a tube 4 whose internal temperature is less than 140 ° C.
  • a high-voltage electrode 3 held by means of an insulator 5.
  • the output of the fluid to be filtered is performed by an outlet 2 placed in the upper part of the tube 4.
  • the electrode 3 must be rigid or fixed in a stable manner.
  • a high voltage generator 6 supplies the electrode 3 and is connected to control means 7 comprising a calculator making it possible to detect arcs occurring between the high voltage electrode 3 and the tube 4.
  • control means 7 can control a wave generator 13 (described below), for example with respect to a low voltage threshold in the high voltage electrode 3.
  • the generator 6 is protected from the power dissipated, during the passage of the arc, by a resistor 8 placed in series.
  • the value of the voltage used on the high voltage electrode 3 is controlled according to the number of arcs detected in the structure, per unit time. It is thus possible to make it keep its optimum value, to ensure maximum efficiency of the filtration system.
  • Clogging of the filter causes the drift of the optimum value of the voltage used and therefore induces a periodic need for cleaning.
  • the inlet 1 has an inlet valve 9 and the outlet 2 has an outlet valve 10.
  • the outlet 2 is equipped with an additional inlet open by means of a valve. purge inlet 11.
  • a cleaning pipe 16 placed at the bottom of the tube 4 has a purge outlet valve 12.
  • the opening of the purge inlet valve 11, which is equipped with a non-return valve, ensures a flow of air coming from the top and going towards the bottom of the tube, thus forcing the transport of the dust towards the retention receptacle 14 which is provided to withstand temperatures identical to the internal temperatures of the filter.
  • the operation can be repeated several times by ensuring that the operation of the sound generator 13 is not simultaneous with the opening of the purge inlet valve 11.
  • the purge inlet 11 and purge outlet 12 valves are closed.
  • the generator 6 is then put back into operation and the inlet 9 and outlet 10 valves are open.
  • the containment chamber 14 which is waterproof is provided removable, while keeping the dust confined.
  • An auxiliary cleaning system with hammers striking the metal walls of the assembly can be set up.
  • the sound generator 13 comprises a metal divergent 17. It is placed on the insulator 5 which may be ceramic. This one prolonging the geometry divergent.
  • the rigid electrode 3 is hollow and pierced with patterns 18 so as to limit its mass and increase its emissivity, and is terminated by a convergent upper portion 19, to be held by centering means 20. Other on the other hand, this convergent shape makes it possible to channel the waves in the inner part of the electrode 3.
  • the centering means 20 and the convergent portion 19 of the electrode 3 allow a distribution of the sound waves inside the tube 4, both inside the electrode 3 and outside. When the sound system is activated, the dust breaks off regardless of their location. No barriers are put in place in the sound system and the internal parts of the filter assembly, which avoids the attenuation of the waves and thus a decrease in the efficiency of the system.
  • tubes 4 can be placed in battery, connected in parallel. The cleaning is then organized by circular rotation of the tubes 4 relative to each other and ensures the continuous operation of the enclosure with optimum efficiency.
  • An entry clarinet 25 feeds all the tubes 4. Each of these is equipped with two isolation valves 28 and 30 placed respectively upstream and downstream of the tube 4. Similarly, an output clarinet 26 receives the output of each tube 4. Once a pair of these isolation valves closed, the assembly constituted by the retention chamber 14 and the extractor 15 is started and a depression is created inside the corresponding tube 4, via a cleaning pipe 29 leading to the base of each of the tubes 4 and equipped with a purge valve 12. The sound generator 13 can then be turned on for the tube 4 concerned.
  • the implementation of this type of system shows that it is possible to maintain the efficiency of the filtration at a value defined by the periodicity of the cleanings.
  • the figure 4 shows the evolution of the efficiency of a filter tube of 350 mm diameter and a height of 4 meters installed on an incinerator of 4 kg / h of organic waste generating approximately 250 Nm 3 / h of gas. This evolution is given according to the power injected by the generator.
  • Point 1 corresponds to the initial efficiency of 99.6% for a voltage applied at 67 kV. If this voltage is constant, the power naturally decreases over time to reach at point 4 a value ensuring efficiency less than 94%.
  • the start of the control loop ensures a rise in voltage from 75 kV to 325 minutes and stabilizes at 80 kV at 330 minutes for efficiency greater than 99%.
  • the voltage of the electrode 3 is always at the maximum allowable voltage before breakdown.
  • the enslavement of the voltage level causes a decrease in voltage over time. It is proposed to automate the process by triggering the cleaning from a low threshold determined the voltage implemented in the electrode 3. However, it is found that system cleaning every six hours ensures optimum efficiency.
  • the cleaning by application of sound waves via the device described above ensures a recovery of more than 99% of the total mass of dust without having to open the structure.
  • the observations made show that the cleaning is as effective on the collecting electrode as on or in the emitting electrode. All dust is collected outside the filter in the retention system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Separation (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Claims (3)

  1. Elektrostatisches Filterungsverfahren mit einer in einem Rohr (4) angeordneten Hochspannungselektrode (3), das darin besteht, den Innenraum des Rohrs (4) und der Hochspannungselektrode (3), wenn sie hohl ist, regelmäßig mittels Schallwellen zu reinigen und eine Absaugung des Flusses durchzuführen, um den Staub direkt rückzugewinnen, wobei Mittel zur Steuerung der Spannung der Hochspannungselektrode (3) verwendet werden, um die Spannung abhängig von der Anzahl abgegebener Bögen zu regeln, dadurch gekennzeichnet, dass die Reinigung ab einer unteren Spannungsschwelle automatisch durch Steuermittel ausgerührt wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Absaugung gleichzeitig mit der Reinigung durch Schallwellen erfolgt.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es in der Verwendung mehrerer Rohre (4) besteht, die fluidisch parallel angeordnet sind, um ihre Reinigung durch zyklische Permutation zu ermöglichen, ohne die Filterung anzuhalten.
EP05847318A 2004-12-17 2005-12-14 Verfahren und vorrichtung zur selbstreinigung und spannungsabhängigen elektrostatischen filterung Active EP1824602B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0453036A FR2879481B1 (fr) 2004-12-17 2004-12-17 Procede et dispositif de filtration electrostatique autonettoyants et asservi en tension
PCT/FR2005/051087 WO2006064163A1 (fr) 2004-12-17 2005-12-14 Procede et dispositif de filtration electrostatique autonettoyants et asservi en tension

Publications (2)

Publication Number Publication Date
EP1824602A1 EP1824602A1 (de) 2007-08-29
EP1824602B1 true EP1824602B1 (de) 2010-05-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05847318A Active EP1824602B1 (de) 2004-12-17 2005-12-14 Verfahren und vorrichtung zur selbstreinigung und spannungsabhängigen elektrostatischen filterung

Country Status (7)

Country Link
EP (1) EP1824602B1 (de)
JP (1) JP4933445B2 (de)
CN (1) CN101124047B (de)
AT (1) ATE468919T1 (de)
DE (1) DE602005021540D1 (de)
FR (1) FR2879481B1 (de)
WO (1) WO2006064163A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104923403B (zh) * 2015-06-29 2018-03-16 浙江大学 声波联合电场作用脱除细颗粒物的装置及其方法
CN105562211B (zh) * 2015-10-16 2017-10-13 建湖隆新石油机械有限公司 静电除尘器
CN107185712A (zh) * 2016-03-15 2017-09-22 哈尔滨宏万智科技开发有限公司 一种简易的电除尘过滤装置
JP7308024B2 (ja) * 2018-12-06 2023-07-13 三菱重工業株式会社 粉塵回収装置および粉塵回収方法
CN109985859B (zh) * 2019-04-24 2023-11-28 伟通工业设备（江苏）有限公司 Uv固化防雾涂装线用均匀离子型静电除尘装置

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DE315534C (de) *
DE1257551B (de) * 1958-10-28 1967-12-28 Joest G M B H Staubfilter mit kranzfoermig an einem umlaufenden Drehgestell angeordneten, von innen besaugten Filterschlaeuchen und einer Beschallungseinrichtung zum Abreinigen der Schlaeuche
AT244467B (de) * 1962-04-03 1966-01-10 Alex Rammelmeyer Dipl Ing Elektro-Staub-Abscheider
JPS5271771A (en) * 1975-12-11 1977-06-15 Chiyoda Kenkyu Kaihatsu Kk Corona discharge electrode
US4147522A (en) * 1976-04-23 1979-04-03 American Precision Industries Inc. Electrostatic dust collector
JPS55139848A (en) * 1979-04-16 1980-11-01 Hitachi Plant Eng & Constr Co Ltd Method and device for removing dust deposited on electrode of electric dust collector
SU927317A1 (ru) * 1980-04-04 1982-05-15 Донецкий Филиал Всесоюзного Научно-Исследовательского Института По Очистке Технологических Газов,Сточных Вод И Использованию Вторичных Энергоресурсов Предприятий Черной Металлургии Способ очистки электродов электрофильтров от пыли
JPS63115448A (ja) * 1986-10-31 1988-05-20 Sanyo Electric Co Ltd 音声認識電話機
JPS63137760A (ja) * 1986-11-28 1988-06-09 Amano Corp 電気集塵機用出力電圧調整装置
JPS63115448U (de) * 1987-01-19 1988-07-25
JPH02121144A (ja) * 1988-10-28 1990-05-09 Olympus Optical Co Ltd 記録媒体の特定位置表示装置
JPH02121144U (de) * 1989-03-17 1990-10-01
FR2655570B1 (fr) * 1989-12-12 1992-06-19 Commissariat Energie Atomique Filtre electrostatique pourvu d'un systeme de decolmatage.
FR2747941B1 (fr) * 1996-04-30 1998-05-15 Commissariat Energie Atomique Filtre electrostatique a procede de decolmatage rapide sans rupture de confinement
JPH09323049A (ja) * 1996-06-05 1997-12-16 Mitsubishi Heavy Ind Ltd パルス荷電用直流ベース電源装置の制御方法
CN2483093Y (zh) * 2001-04-25 2002-03-27 杨春根 电除尘器清灰装置
CN2544813Y (zh) * 2002-04-26 2003-04-16 北京中科工程管理总公司 远程低频声波振打除尘器

Also Published As

Publication number Publication date
WO2006064163A1 (fr) 2006-06-22
EP1824602A1 (de) 2007-08-29
JP4933445B2 (ja) 2012-05-16
FR2879481A1 (fr) 2006-06-23
CN101124047A (zh) 2008-02-13
CN101124047B (zh) 2011-02-16
ATE468919T1 (de) 2010-06-15
DE602005021540D1 (de) 2010-07-08
FR2879481B1 (fr) 2007-09-28
JP2008523978A (ja) 2008-07-10

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