|ICESP X CONFERENCE PAPER ABSTRACTS
Held in Cairns,
Conference on Electrostatic Precipitation (ICESP)
is the official conference of the International Society for Electrostatic
In the search for the best way to improve the efficiency of electrostatic precipitators (ESP’s)and especially to increase the rate of fine particle removal, conflicts between some influencing physical parameters are encountered over and over again. Obviously, the optimal solution should take into account the conflict between the physical effects on particle charging and those on the particle collection at the plate electrodes: Efficient charging of the particles requires a strong gas ionization (corona) and a high current flow. In contrast, a strong electrical field is necessary for the collection of the particles. A high current flow is not required here. These different requirements for the control of the charging and collecting effects are what we call the “ESP conflict”. The technical solution developed by Balcke-Duerr to solve this conflict is the “Bi-Corona Technology (BCT)”. This technology is based on a patent which was first filed during the authors earlier professional time with Walther&Cie in Cologne, Germany and which was first introduced on the ICESP VII in 1998 in Kyongju, Korea (1). The special design of the discharge electrodes and the matched construction of the collecting electrodes make it possible to meet the different requirements of highly effective particle charging and collecting. The principle is to divide each electrical field of the ESP into several different ionization and collection zones (Bi-Corona Principle). The Balcke-Duerr Bi- Corona System was developed for new ESP’s and for retrofitting existing ESP’s. The presentation will show some details of the patented design, results and measurement data of converted ESP’s in comparison to conventional units, as well as preliminary laboratory tests.
To View Paper in PDF Format Click Here
To go Back to ICESP Paper Page Click Here
ANDREAS BÄCK1* AND KJELL PORLE, HITOSHI TOMIYAMA KJELL NOLIN
The by far most commonly used type of electrostatic precipitator for both power andindustrial applications is the conventional parallel plate duct type ESP. In the early 1990's a novel variant of ESP electrode systems, resulting in a completely different layout of the internals, was developed in Japan. This so called ERDEC design has alternating collecting and discharge electrodes in the gas direction with the discharge electrodes having a multitude of extremely sharp corona points while the collecting plates are short and densely spaced. A number of these ESP's have previously been installed in Japan for some smaller industrial applications and have shown satisfactory performances. These units have worked at smaller volumes and lower treatment times of the gas than is usually the case for conventional ESP's, hence implying a cost efficient design.
This paper describes the installation and testing of a two-field ESP based on ERDEC designafter a 12 MWth oil fired auxiliary boiler at Karlshamn Kraft AB in Sweden. The oil has a sulphur content of 2.1 % and gives a very low inlet particulate loading with a large fine fraction. The corresponding outlet particulate emissions after the ESP have been measured at 1-2 mg/Nm3. Also low sulphur oil, which gave much higher inlet dust concentrations of mainly unburnt content, was investigated. The emission for the low sulphur dust was dominated by dust re-entrainment during rapping. Rapping losses are known to be a major problem for ESP's dealing with large unburnt particles from oil firing. The main findings are that the ERDEC design performs well from a precipitator point of view, and that the reduced footprint and casing volume that could be achieved deserves further attention.
Last updated: May 10, 2009.
Copyright © 1999 TRK Engineering Services, Inc. All rights reserved.
For more information contact: TRK Engineering Services - 95 Clarks Farm Road - Carlisle, MA 01741 - Telephone: 978-287-0550 - Fax: 978-287-0569 - email: email@example.com