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ICESP X CONFERENCE PAPER ABSTRACTS 7C SERIES

Held in Cairns, Australia
June 25 - 29, 2006

The International Conference on Electrostatic Precipitation (ICESP) is the official conference of the International Society for Electrostatic Precipitation (ISESP).  

The following is a list of the Abstracts for the 7C Series papers from the X ICESP Conference.  

7C1
COST COMPARISONS BETWEEN ELECTROSTATIC
PRECIPITATORS AND PULSE JET FABRIC FILTERS AND INHERENT CHALLENGES OF BOTH TECHNOLOGIES AT ESKOMS 6 X 600 MW UNITS AT DUVHA POWER STATION
ROD HANSEN AND ROBBIE VAN RENSBURG

Abstract

3 600 Mw Duvha Power Station situated near Witbank in Mphumalanga Province presents a unique opportunity to make a direct comparison of operating and maintenance costs between electrostatic precipitators (ESPs) and retrofitted pulse jet fabric filters (PJFFs). Units 1 to 3 have the ABB Flakt design PJFFs and Units 4 to 6 have the originally installed Lurgi design ESPs with 5 field 141 m2/m3/s specific collecting area (SCA). These ESPs have subsequently been retrofitted with sulphur trioxide flue gas conditioning (SO3 FGC). This comparison is particularly interesting when viewed in the context of the Legislation which compels either a load reduction or an outage in order to avoid contravening particulate emission Limits and this at a time when there is little reserve margin on the total Eskom System. The trade-off between operational costs and the ability to generate MWs can be complex.

This paper will briefly review some of the early problems experienced with the PJFFs and measures taken to increase bag life, ultimately resulting in a change to a more expensive fabric type. It also reviews some of the day by day operational demands of the ESPs.


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7C2 
COLORADO SPRINGS UTILITIES
IMPROVES FABRIC FILTER PERFORMANCE BY INSTALLING EXPANDED PTFE MEMBRANE FILTER BAGS
FRANCIS D. FEREDAY, TODD W. FOLMSBEE, JAMES FISHER AND GARY KLEIN

Abstract

Actual operating results have been used to empirically determine the relationship between fabric filter (baghouse) differential pressure and stack gas flow in a reverse gas cleaned fabric filter. Assumptions are made that the tubesheet pressure drop is the sum of the pressure loss across the filter media and the dust cake. The dust cake is comprised of a component that remains on the bag after cleaning and a removable component that accumulates between cleaning cycles. The component that accumulates between cleaning is proportionate to the inlet dust concentration, the filter velocity and the time between cleaning. This relationship was examined with conventional fiberglass filter bags and with filter bags that have an ePTFE membrane laminated to the woven fiberglass. On average, the results show a 41% decrease in fabric filter drag that allowed actual stack gas flow to increase by 5% and baghouse pressure differential to decrease by 39%. Results suggest the lower drag is attributable to improved ash removal from the bag during cleaning and not due to lower resistance through the filter media itself. Maximum electric power generation increased by 2.8% during the peak summer demand period due to the higher gas flow achieved with the ePTFE membrane bags.


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To go Back to ICESP Paper Page Click Here



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Last updated: May 10, 2009.
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