EP0973615B1 - Verfahren zur reinigung von staubbeladenen prozessabgasen - Google Patents
Verfahren zur reinigung von staubbeladenen prozessabgasen Download PDFInfo
- Publication number
- EP0973615B1 EP0973615B1 EP98912138A EP98912138A EP0973615B1 EP 0973615 B1 EP0973615 B1 EP 0973615B1 EP 98912138 A EP98912138 A EP 98912138A EP 98912138 A EP98912138 A EP 98912138A EP 0973615 B1 EP0973615 B1 EP 0973615B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dust
- electrostatic filter
- wet electrostatic
- particles
- gas flow
- 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.)
- Expired - Lifetime
Links
Images
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
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- 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
- B03C3/36—Controlling flow of gases or vapour
Definitions
- the invention relates to a method for cleaning dust-laden process exhaust gases in a wet electrostatic precipitator.
- the product of the migration speed and the precipitation electrode area (wA) remains as a parameter, i.e. if the migration speed of the dust to be separated is known, the filter, in particular the necessary precipitation electrode area, can be dimensioned.
- the speed of migration is also dependent on several parameters, such as dust particle size, dust composition and exhaust gas speed.
- Wet electrostatic precipitators are typically operated at exhaust gas flow rates of 1.5 m / s 2 m / s designed. This results, for example, for the sintering plant dedusting because of the small particle sizes migration speeds on the precipitation electrode surface of approx. 10 cm / s.
- This low exhaust gas velocity requires an increased effort for Flow distribution devices on the inlet and outlet sides in the filter to even out the Exhaust gas flow. So usually occur within exhaust gas channels before and after the filter Exhaust gas flow rates on the order of about 20 m / s. this means an acceleration on the outlet side of the filter or a deceleration on the inlet side of the filter by a factor of approx. 10-13 each.
- the object of the invention is now a method for cleaning dust-laden Provide exhaust gases in a wet electrostatic precipitator, which is characterized in that the Exhaust gas flow rate is set to a value so that the highest possible Migration speed occurs and at the same time the disadvantages of the prior art, especially complex flow equalization devices and large Precipitation electrode surfaces can be avoided.
- wet electrostatic filters are understood to mean both such where the exhaust gas is fully or almost completely saturated with water vapor before entering the filter even those in which the exhaust gas shows a significant undersaturation when entering the filter Has water vapor.
- the cleaning of the Precipitation electrodes happen by additional water injection.
- the subject invention which thereby is characterized in that the exhaust gas flow rate to a value of 4 m / s to 9 m / s is set.
- the exhaust gas flow rate to a value of 4 m / s to 9 m / s is set.
- the migration speed of the particles increases compared to Migration speeds at current exhaust gas flow speeds of 1.5 m / s to 2 m / s for wet electrostatic precipitators in the case of sintering system dedusting of approximately 10 cm / s over 40 cm / s.
- the precipitation electrode area and hence the weight of the precipitation electrode in relation to the increase in Migration speed can be reduced. Furthermore, the effort for Flow equalization devices on the inlet and outlet sides of the filter are thus minimized (Deceleration or acceleration only by a factor of approx. 2-5). The Wet electrostatic precipitator is reduced accordingly, which also means the investment costs turn out to be lower.
- the migration speed increases up to exhaust gas speeds of approx. 6 m / s approximately linear, at higher speeds the curve flattens out noticeable.
- the range from 4 m / s to 9 m / s according to the invention there are hardly any undesirable effects Drop detachment.
- FIG. 2 shows cumulative curves 2 of particle size analyzes of in in a coordinate system raw gas dust present in various tests, with the Grain size classes of the gas particles in ⁇ m, and the cumulative ones on the ordinate Concentrations of the respective grain size classes are plotted in percent. Like from the Curves can be seen, the majority of the particles lie in a comb band 0.03 ⁇ m and 4.0 ⁇ m.
- the dust-laden raw gas originating from a sintering plant is first removed by a Washer led. There is a pre-separation of larger particles (> 16 ⁇ m) and one Enrichment or saturation of the gas with steam instead. The fine separation takes place in the wet electrostatic precipitator described above.
Landscapes
- Electrostatic Separation (AREA)
- Treating Waste Gases (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Lasers (AREA)
Description
Röhrenfilter mit Wasserkühlung | |
Rohrdurchmesser innen | 200 mm |
Anzahl Rohre | 6 (zweistufig) |
Rohrlänge | 2,6 m |
Sprühelektrode | Stab |
Spannung | 45 KV |
Strom | 17 mA |
Claims (6)
- Verfahren zur Reinigung von Wasserdampf enthaltenden, staubbeladenen Prozeßgasen in einem Naßelektrofilter, wobei eine Vorabscheidung größerer Staubpartikel, insbesondere von Staub mit einer Korngröße von mehr als 16 µm, sowie eine Anreicherung bzw. eine Sättigung der Prozeßgase mit Wasserdampf in einem Wäscher durchgeführt wird und wobei die Gase bzw. die darin enthaltenen Staubteilchen, welche anschließend das Naßelektrofilter durchströmen, in einem Raum zwischen einer oder mehreren Sprühelektroden und einer oder mehreren Niederschlagselektroden aufgeladen werden und an der bzw. den Niederschlagselektroden abgeschieden werden, dadurch gekennzeichnet, daß die Abgasströmungsgeschwindigkeit durch das Naßelektrofilter auf einen Wert von 4 m/s bis 9 m/s eingestellt wird, und wobei das Naßelektrofilter im Bereich der Niederschlagselektroden, die eine dafür ausreichende Länge aufweisen, die gesamte restliche Staubabscheidung bewirkt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Abgasströmungsgeschwindigkeit durch das Naßelektrofilter auf einen Wert von 4,5 m/s bis 9 m/s eingestellt wird.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Abgasströmungsgeschwindigkeit durch das Naßelektrofilter auf einen Wert von 5 m/s bis 9 m/s eingestellt wird.
- Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der abzuscheidende Feinstaub zu wenigstens 90 % aus Teilchen mit einer Korngröße von bis zu 4 µm besteht.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß wenigstens 80 % der Gesamtmenge der Teilchen des abzuscheidenden Staubes in einem Kornband von 0,03 µm bis 2,0 µm vorliegen.
- Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß als Sprühelektrode eine stabförmige Elektrode verwendet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0062197A ATA62197A (de) | 1997-04-11 | 1997-04-11 | Verfahren zur reinigung von staubbeladenen prozessabgasen |
AT62197 | 1997-04-11 | ||
PCT/AT1998/000088 WO1998046359A1 (de) | 1997-04-11 | 1998-04-03 | Verfahren zur reinigung von staubbeladenen prozessabgasen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0973615A1 EP0973615A1 (de) | 2000-01-26 |
EP0973615B1 true EP0973615B1 (de) | 2002-07-31 |
Family
ID=3495450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98912138A Expired - Lifetime EP0973615B1 (de) | 1997-04-11 | 1998-04-03 | Verfahren zur reinigung von staubbeladenen prozessabgasen |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0973615B1 (de) |
CN (1) | CN1252016A (de) |
AT (2) | ATA62197A (de) |
AU (1) | AU735231B2 (de) |
DE (1) | DE59805002D1 (de) |
WO (1) | WO1998046359A1 (de) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3329638A1 (de) * | 1983-08-17 | 1985-03-07 | Gottfried Bischoff Bau kompl. Gasreinigungs- und Wasserrückkühlanlagen GmbH & Co KG, 4300 Essen | Vorrichtung fuer die entstaubung von industriellen gasen |
-
1997
- 1997-04-11 AT AT0062197A patent/ATA62197A/de not_active Application Discontinuation
-
1998
- 1998-04-03 DE DE59805002T patent/DE59805002D1/de not_active Expired - Fee Related
- 1998-04-03 WO PCT/AT1998/000088 patent/WO1998046359A1/de active IP Right Grant
- 1998-04-03 AT AT98912138T patent/ATE221416T1/de not_active IP Right Cessation
- 1998-04-03 CN CN98804050.6A patent/CN1252016A/zh active Pending
- 1998-04-03 EP EP98912138A patent/EP0973615B1/de not_active Expired - Lifetime
- 1998-04-03 AU AU67116/98A patent/AU735231B2/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
EP0973615A1 (de) | 2000-01-26 |
ATE221416T1 (de) | 2002-08-15 |
AU735231B2 (en) | 2001-07-05 |
WO1998046359A1 (de) | 1998-10-22 |
AU6711698A (en) | 1998-11-11 |
ATA62197A (de) | 2000-07-15 |
CN1252016A (zh) | 2000-05-03 |
DE59805002D1 (de) | 2002-09-05 |
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