ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Trocken-Elektrofilter: Innovativer Einsatz in der WTA Braunkohlentrocknung der RWE Power AG

Technical information about

Electrostatic PrecipitatorInnovative use in WTA technology for lignite drying

Plant from RWE Power AG

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Raw Gas

RohgasBrden aus Kohletrocknung

Electrical Power

Elektrische Energie

Clean Gas

Reingas

Collected particles

abgeschiedener Braunkohlestaub

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Gas: Steam withcoal dust

Volume flow: 180.000 m/h

Temperature: 130 C

Pressure: 1,300 bar g

Collection area: 4.344 m

High tensionvoltage:

86.000 V

Current: 1.200 mA

Dust outlet total: 22 t/h

Clean dustconcentration

20 mg/m (i.N.)

Complete trace heating of the whole casing surface

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Typical frame construction of an ESP with internal bracings

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Construction details for the ESP(To be seen on next page)

Design for 300 mbar over pressure Material: common carbon steel, only Trough type hoppers with inliner from stainless

steel. All Internals are designed to prevent dust accumulation on surfaces (no horizontal

corners, no horizontal bars) Hopper in trough type shape with long screw inside Discharge frame pipes gastight to prevent dust inside Purging of Isolators with N2/ Steam during operation Washing of ESP internals with water, used only prior to maintenance Rapping of distribution planes required Additional flexible vanes from flexible textile material

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Discharge electrodes pipes gastight to

prevent dust inside

Additional flexible vanes from flexible textile material Hopper in trough type shape

Rapping of distribution planes required

Washing of ESP internals with water, used only prior to maintenance

Purging of Isolators with N2/ Steam during operation

Darstellung mit WTA E-Filter und den WTA specifischen Auslegungsdetails

Material: common carbon steel, only Trough type hoppers with inliner from stainless steel.

All Internals are designed to prevent dust accumulation on surface (no corners, no horizontal bars)

Design for 300 mbar over pressure

Complete trace heating of the whole casing surface

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Verfahrensschritte

1. Elektronen-Emission Korona der Elektrode

2. Ladung Staubpartikeln Diffusionsladung fr

Partikel < 0,5 m Feldladung fr

Partikel > 0,5 m3. Transport der geladenen

Partikel Coulombsche Kraft Stokesches Gesetz

4. Staubansammlung an der Niederschlagselektrode Kohsion / Adhsion Spannung

5. Staubabreinigung von der Niederschlagselektrode mechanisches Klopfen Schwingung

Staubbelag

Nieder-schlags-elektroden-flche

KlopfmechanikSprhelektrode mit negativerHochspannung (20 111 kV)

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Electrode SystemZT 24 / VARIODYN 15

Sprh- und Nieder-schlagselektrodeZT 24 / VARIODYN 15

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Discharge Frame withVARIODYN 15 Electrodes

Sprhrahmen mit VARIODYN 15 Elektroden

Discharge frames in WTA design: pipes gastight welded to prevent anydust inside of the frame

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Distribution of Rapping Acceleration in g Values over the Surface of a Collecting Electrode Type ZT 24

Verteilung der Klopfbeschleunigungen in g an der Oberflche einer Niederschlagselektrode Typ ZT 24

Klopfschlag

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

ESP (Background) to separete Lignite dust from exhaust vapour;Small unit (foreground) is bag filter for all aspiration streams (not part of the process)

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Erection trough type ESP hopper

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Erection of collecting electrode plates

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Roof: Raincover, Insulation and steam traceheating

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Support insulator on roof levelCasing 10% trace heated with steam pipes

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

TR-Unit (transformer-rectifier for high tension)

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Ducts from lignite dryer, on the way to ESP (background)

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Gas distribution plates in gas inlet Passages with collecting electrodes (plates) and discharge electrodes (frames with spanned wires)

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Rheinisches Braunkohlerevier

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

WTA lignite drying gives 4-6 % more efficiency compared with integrated lignite drying in boiler

Rauchgas+ Brden1,000C

heiesRauchgas

Roh-kohle

Trockenkohle+ Rauchgas+ Brden

Kessel

TBK-Konzept:Separate Trocknung (WTA)

Kessel

Rauchgas

Trockenkohle

WTA

BoA-Konzept:integrierte Trocknung

Roh-kohle

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

53 t/h Rohkohle

WTA 1 Frechen1993 1999

ca. 20.000 Betriebsstd.

Grobkorntrocknunggrotechnisch

einsatzreif

29 t/h Rohkohle

WTA 2 Frechen2000 2004

ca. 8.000 Betriebsstd.

Feinkorntrocknung einfache, robuste Technik geringe Investitionskosten

210 t/h Rohkohle

WTA 2 Niederauemab 2009

Bisher ca. 3500 Betriebsstd.

FeinkorntrocknungErste vorkommerzielle

Anlage

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

ENVIROTHERMElektrofilter: Einsatz in der WTA-Anlage der RWE Power AGESP: Innovative use in lignite drying plant with WTA technology

Trockenkohleproduktion: 110 t/hWasserverdampfung: 100 t/h

Rohkohlekrnung: 0 - 2 mm Rohkohleeinsatz: 210 t/h

WTA-Konzeption fr 1000 MW BlockWTA-Prototypanlage

Auslegungsdaten WTA-Prototypanlage

840 t/hRohbraunkohle

1. Strang

2. Strang

3. Strang

4. Strang

Trockenkohle

440 t/h

Umfang WTA-Prototyp