|ICESP IX CONFERENCE PAPER ABSTRACTS
A 31-32 SERIES
Held in Kruger
Gate, Mpumalanga, South Africa
Conference on Electrostatic Precipitation (ICESP)
is the official conference of the International Society for Electrostatic
A. Marquard, J. Meyer, G. Kasper
A Deutsch-similar correlation between measured overall collection efficiencies and migration velocities is found, covering all investigated cases: negative and positive corona, spherical and non-spherical particles, different particle sizes and - what might be the most important result - both low and high corona quenching conditions, respectively. It is shown for the given case of electrostatic precipitation of nanoparticles that the particle movement happens to be independent on the charging circumstances. The precipitation correlates only to the charging result (electric particle mobility) in the average electric field, represented by the migration velocity or the non-dimensional Deutsch number.Since the charging physics for particles below 200 nm is dominated by the diffusion charging mechanism, the established Fuchs theory (1963) is used for the comparison with the measured charge values, with ion density calculations based on an analytical solution of the Poisson equation. In the case of negatively charged particles for high N∑t-products a considerable underestimation of the experimental data is observed. In the case of positively charged particles the measured data match the predictions better, but for N∑t > 1014 s/cm3 the measured values also tend to surpass the predicted ones.
A32DOES SO3 FLUE GAS CONDITIONING HAVE AN IMPACT ON THE ENVIRONMENT - AN ASSESSMENT
Michael Vukmir & Michael W. Rollock, BS ChE.
concentration and it was accepted that all the SO3 reacted with the fly ash in order to achieve the improved ESP performance. SO3 FGC is a very effective way of reducing the particulate emissions and has been effective in doing so at all the Eskom Power Stations where it has been implemented. There are however some exceptions where SO3 FGC alone will not be able to achieve the low emission levels that will be required by the Chief Air Pollution Control Officer (CAPCO). These are typically the older power stations with small ESPís that have been sized to achieve the emission required at the time of construction and are not acceptable for current requirements. These power stations normally have to install SO3 FGC and upgrade their existing ESPís to be capable of reliably giving emissions below 50mg.S.m3 or they have to install fabric filters. SO3 FGC forms an integral part of Eskomís drive in the reduction the particulate emissions and it was therefore decided to evaluate its impact as part of the Eskom Emissions Research Portfolio. This paper reports on the results obtained during this assessment.
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Last updated: May 10, 2009.
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