EP1732695A1 - Verfahren zur steuerung einer vorrichtung für die elektrostatische partikelabscheidung in gasströmen, sowie steuerungseinheit hierzu - Google Patents
Verfahren zur steuerung einer vorrichtung für die elektrostatische partikelabscheidung in gasströmen, sowie steuerungseinheit hierzuInfo
- Publication number
- EP1732695A1 EP1732695A1 EP05714729A EP05714729A EP1732695A1 EP 1732695 A1 EP1732695 A1 EP 1732695A1 EP 05714729 A EP05714729 A EP 05714729A EP 05714729 A EP05714729 A EP 05714729A EP 1732695 A1 EP1732695 A1 EP 1732695A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flue gas
- control unit
- particle separation
- capacitance
- measuring
- 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
Classifications
-
- 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
- B03C3/66—Applications of electricity supply techniques
- B03C3/68—Control systems therefor
-
- 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
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/49—Collecting-electrodes tubular
Definitions
- the present invention relates to a method of how a particular device for electrostatic particle separation in gas streams can be controlled, as well as the relevant control unit.
- the method and associated control unit for its use is suitable for controlling a device which serves to clean or filter the flue gas of small furnaces.
- These small furnaces with capacities up to about 70kW are different heat generators for the space heating needs as well as for cooking. These include, in particular, fireplaces, tiled stoves, stoves, cookers and boilers fueled with wood.
- Aerodynamically relevant to human health are particles with an aerodynamic diameter of significantly less than 10 microns, because particles can accumulate from such a small amount in the lungs. These particles also bind dioxins, which are taken up by humans after the particle deposition on soils and plants via the food chain. Since it has been shown by measurements that the emitted particles of wood firing in the critical range of less than 10 microns in diameter, it is therefore necessary to install even in the field of simple wood combustion systems suitable flue gas devices to retain these micro particles.
- a portion of an electrically conductive tube is mounted to the lid to form a collector surface.
- the typical connection value of the high voltage generator is between 10 and 50VA and it can be operated with 220V / 50Hz or 110V / 60Hz alternating current.
- the charge of Spray electrode can be negative or positive to earth. The cleaning of the collector part can easily be done by hand after removal of the electrode wire with the bracket.
- this device has a self-supporting rod electrode in the form of a metal strip, which is strong enough that he can carry himself. Instead of such a metal strip but also a wire of sufficient strength can be used.
- the decisive feature of the spray electrode is the presence of the smallest possible radii, where high local field strengths occur. It has now been shown that the best results are achieved with a wire as thin as possible, which extends with its free end in the middle along a flue gas tube. However, thin rod-like wires begin to vibrate as a result of the resulting charge conditions, because the high electrical charge of the wire generates image charges of opposite polarity on the proximal inner surface of the exhaust pipe. The tube wall opposite a negatively charged wire is therefore positively charged.
- the object of the present invention is therefore to automatically design the switching on and off of a device for the electrostatic particle separation in the flue gas stream of wood firing and thus to provide a method for this and the associated control unit for operating the method. Once the wood firing is put into operation, the particle separation is to be reliably activated, and as soon as the flue gas stream subsides, it should be switched off with the same reliability.
- This object is achieved by a method for controlling a device for the electrostatic particle separation in gas streams, which is characterized in that the changes in the dielectric properties are detected within the flue gas duct as a result of combustion, by the electric capacity between the flue gas duct and a measured in the flue gas flow spray or measuring electrode.
- control unit for a device for electrostatic particle separation in gas streams consisting of a spray or measuring electrode and an electrically conductive flue gas channel section as a collector surface, further comprising a measuring device for measuring the capacitance between the flue gas duct and the spray or measuring electrode and an electronic control unit for the circuit of the device using the measured capacitance as a guide size.
- Figure 1 An embodiment of a device for electrostatic particle separation in gas streams
- FIG. 2 shows a measuring arrangement for connecting upstream of a device for particle separation, for measuring the capacitance between, on the one hand, a flue-gas pipe section, which is arranged inside a flue-gas channel, and, on the other hand, the flue-gas channel, with associated exemplary measuring diagram;
- Figure 3 A control unit for the circuit of the apparatus for electrostatic particle separation, " downstream of the measuring device.
- electrostatic precipitators function according to the principle that electrically charged, solid or liquid particles are deflected in an electric field.
- the soot particles must therefore first be charged electrically.
- the unipolar charged particles subsequently deposit on separation plates as a result of the action of the electrostatic field.
- dust and aerosols with particle sizes of 0.01 to 60 ⁇ m can be deposited.
- the efficiency of the deposition also depends on the flow velocity of the particles and the dust concentration in the gas flow, as well as on the temperature and humidity in the inflowing gas.
- a possible device for electrostatic particle separation in gas streams is shown, which is also suitable for flue gas cleaning of small furnaces. It is designed for installation in a straight section of an existing, electrically conductive stovepipe 1.
- the device comprises an electrode holder 6 made of metal, preferably made of stainless steel, which is provided for receiving the electrode 4 with a bore.
- the socket 6 has an electrode thickness of 0.3 mm in the socket area a diameter of several millimeters and is held by a clamp or bayonet connection in a metallic holder 7, as shown in enlarged section.
- the holder 7 is attached to a support rod 2, which is also preferably made of stainless steel.
- the holding bar 2 is guided by an insulator 3 in the flue gas pipe 1.
- the insulator 3 is advantageously made of a plastic, for which polyetheretherketone (PEEK) is suitable, because this material allows a certain charge migration, so that no charge nests can form, but discharges continuously. In contrast, in a porcelain or ceramic insulator under DC voltage charge nests, which then migrate to the outside and lead to spontaneous breakthroughs (TE).
- PEEK polyetheretherketone
- the insulator 3 is firmly connected to the lid 5.
- the version 6 can be cylindrical or as shown here spherically shaped, with a diameter of about 10mm and a central bore in which the electrode 4 is seated and held.
- the opening on the furnace tube 1 is designed so large that the holder 7 is inserted under elastic bending of the wire 4 in the furnace tube 1, and thereafter, the opening 1 is closed gas-tight with the lid 5, including offering about suitable clamps, clamping lever or clamping screws ,
- a high voltage generator with rectifier function is both electrically and thermally isolated from the furnace tube 1 and is powered by a power cable.
- the high voltage output is passed through the insulator 3 via the socket 6 to the spray electrode 4, which advantageously consists of a tungsten wire.
- the other pole is at ground potential and is electrically connected to the furnace tube 1, which acts opposite the electrode 4 as Abscheide imagery.
- an electrostatic filter is formed, wherein the wire 4 forms the spray electrode, and the inside of the furnace tube 1 over the length of the electrode wire 4 also forms the collecting electrode or collector surface, so that the entire chimney, so far as it consists of conductive material, can act as a collector surface ,
- the high voltage is first turned off. Then, the holder 7 is removed with the electrode 4 from the furnace tube 1. Thereafter, the inside of the stovepipe 1 can be rubbed off with a damp cloth, whereby the electrically retained particles are wiped off and stuck on the cloth. Alternatively, the collected particles can also be wiped off and vacuumed with the vacuum cleaner brush.
- the electrode 4 is then reintroduced into the furnace tube 1 and the lid 5 placed gas-tight on the opening and clamped. The cleaned collector surfaces are now free again to be fogged with new particles, because now also the electrical attraction is fully effective again.
- FIG. 2 shows a measuring arrangement for connection upstream of a device for particle separation, which has been practically tested. Every 30 minutes, the flue gas flow was interrupted, resulting in a very significant drop in measured capacity. The measurement took place here over 10 hours and shows a reliable reproducible capacity change, which correlates with the presence of the flue gas stream. Without flue gas, a consistently lower capacity is measured than with flue gas. Therefore, the measured value of the capacity can be used as a guide size for a control unit.
- the actual capacitance measurement can be done by measuring the charging or discharging time of the capacitor, which is formed from the electrodes - ie either of spray and flue gas duct or flue gas pipe section and flue gas duct. It is also advantageous to integrate the capacitance of this capacitor into a resonant circuit or an unstable flip-flop so that the capacitance changes are reflected in the oscillation frequency. A change in the oscillation frequency then gives the signal for switching on or off the operating voltage.
- FIG. 3 shows a device for electrostatic particle separation in a schematic representation, and the associated control unit 9 for switching on and off of the device, which is connected to the mains.
- This control unit 9 is grounded and includes a measuring device 10 for the capacity and a control logic 11 for the associated high voltage source 12 of the device.
- the measuring arrangement for the capacitance measurement as shown in Figure 2 is connected upstream of this device, so that a flue gas first flows through the electrically conductive flue gas tube 7 inside the electrically conductive flue gas channel 1 and thereby affects the capacity between these two parts 1, 7.
- the variables measured by the measuring device 10 are then processed by the control logic 11 in the control unit, and accordingly the high-voltage source 12 is switched on or off, which ensures the ionization voltage at the electrode 4 with respect to the flue gas channel 1. This ensures that the Device for the electrostatic particle separation is always reliably put into operation as soon as and as long as flue gas flows through the flue gas pipe section 1 upstream in the flue gas duct 1, while after the fading of the flue gas flow due to the then reduced measured capacity, the device is turned off.
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electrostatic Separation (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Chemical Vapour Deposition (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH6182004 | 2004-04-08 | ||
PCT/CH2005/000187 WO2005097332A1 (de) | 2004-04-08 | 2005-03-31 | Verfahren zur steuerung einer vorrichtung für die elektrostatische partikelabscheidung in gasströmen, sowie steuerungseinheit hierzu |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1732695A1 true EP1732695A1 (de) | 2006-12-20 |
EP1732695B1 EP1732695B1 (de) | 2009-05-13 |
Family
ID=34969481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05714729A Not-in-force EP1732695B1 (de) | 2004-04-08 | 2005-03-31 | Verfahren zur steuerung einer vorrichtung für die elektrostatische partikelabscheidung in gasströmen, sowie steuerungseinheit hierzu |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1732695B1 (de) |
AT (1) | ATE431190T1 (de) |
DE (1) | DE502005007280D1 (de) |
WO (1) | WO2005097332A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008011561A1 (de) | 2008-02-28 | 2009-09-10 | Raziol Zibulla & Sohn Gmbh | Einrichtung zur Reinigung ölhaltiger Abluft |
DE102010042914B4 (de) * | 2010-10-26 | 2012-05-24 | Wachtel GmbH & Co. Bäckereimaschinen-Backöfen | Messvorrichtung und Verfahren zur Erfassung von Verbrennungsluftbestandteilen |
CN102962135B (zh) * | 2012-09-26 | 2015-08-05 | 山东国舜建设集团有限公司 | 湿式烧结脱硫烟气深度净化装置 |
ES1147908Y (es) * | 2015-06-30 | 2016-03-10 | Univ Vigo | Precipitador electrostático autoregenerable |
DE102018009727A1 (de) * | 2018-12-11 | 2019-11-28 | Diehl Aviation Gilching Gmbh | Abscheidevorrichtung zum Reinigen von Gasen |
CN109940000B (zh) * | 2019-04-24 | 2023-11-28 | 伟通工业设备(江苏)有限公司 | Uv固化防雾涂装线用可间隔蓄压冲刷的静电除尘装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB769457A (en) * | 1953-12-17 | 1957-03-06 | Research Corp | Automatic voltage control of electrostatic precipitator with saturable reactor |
US4177045A (en) * | 1978-07-10 | 1979-12-04 | Orel Jeannette V | Self-acting smoke sorbing device |
US5688308A (en) * | 1995-05-30 | 1997-11-18 | Trion, Inc. | Electrostatic air cleaning system with air flow sensor |
JP4265120B2 (ja) * | 2001-07-19 | 2009-05-20 | 株式会社豊田中央研究所 | 内燃機関の排ガス浄化装置 |
US6919053B2 (en) * | 2002-02-07 | 2005-07-19 | Constantinos J. Joannou | Portable ion generator and dust collector |
-
2005
- 2005-03-31 EP EP05714729A patent/EP1732695B1/de not_active Not-in-force
- 2005-03-31 AT AT05714729T patent/ATE431190T1/de not_active IP Right Cessation
- 2005-03-31 DE DE502005007280T patent/DE502005007280D1/de active Active
- 2005-03-31 WO PCT/CH2005/000187 patent/WO2005097332A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2005097332A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005097332A1 (de) | 2005-10-20 |
DE502005007280D1 (de) | 2009-06-25 |
EP1732695B1 (de) | 2009-05-13 |
ATE431190T1 (de) | 2009-05-15 |
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