|ICESP X CONFERENCE PAPER ABSTRACTS 7B SERIES
Held in Cairns,
Conference on Electrostatic Precipitation (ICESP)
is the official conference of the International Society for Electrostatic
ALISTAIR HENDERSON AND JIPING ZHOU
Modern electro-hydrodynamic models of electrostatic precipitator behaviour are now publiclyavailable and have been widely used in the U.S.A., Europe and the NIS. The best known of the new models is ESPVI, developed by the US EPA, which simulates the precipitator on an element basis to give an extensive amount of operating information. The performance of this model with Southern Hemisphere coal ashes has not previously been reported, but is of interest throughout the world due to the large quantity of traded steaming coal from this region.
A complete electrical, mechanical and performance study of a precipitator collecting ash from a utilityburning Central Queensland coal was used to test the ability of the ESPVI model to predict actual operating conditions. The study was undertaken before and after a major overhaul, enabling both new and deteriorated conditions to be modeled.
Further studies of other regional precipitators were undertaken to compare the results amongstinstallations with widely varying ash content and elemental analysis. The results of these studies are presented to allow users to apply the models to their own installations for performance prediction when considering remedial or upgrade work.
N. CARAMAN, G. BACCHIEGA, I. GALLIMBERTI, V. ARRONDEL
The rapping process is not yet well understood for two main reasons : on the one hand theobjectives of the research have been focused for many years on a empirical optimisation of rapping, the knowledge of generation and evolution of the layer was considering as less significant, on the other hand the evolution of the dust layer is difficult to reproduce in a laboratory physical model. The experimental study of the mass balance in an industrial esp pilot provided precious data and made the development of the model possible. It has been compared with good agreement with an industrial esp test in a 500MW power plant. The model of rapping plates has been developed and integrated in the new version of the EDF-IRS software ORCHIDEE to help the plant staff to optimise their rapping sequences. ORCHIDEE is a user friendly software and we succeed to integrate the rapping model with only geometrical and operational data like the different times of rapping operation, the variation of these times influences the layer thickness on the plate and finally the collecting efficiency.
L. ZHAO, E. DELA CRUZ2, K. ADAMIAK, A.A. BEREZIN, J.S. CHANG
A new numerical model for the electric field and gas flow in a wire-plate electrostaticprecipitator with a single corona wire is presented. The electrical conditions in the precipitator channel are simulated by solving a full two-dimensional single-species model of the electric corona discharge. The electric field and space charge density are predicted by simultaneously solving the electric field and charge transport equations using a hybrid Finite Element – Method of Characteristics numerical algorithm. The electric Coulomb force generates the secondary electrohydrodynamic flow of air, which modifies the main gas flow. This part is simulated by solving the Navier-Stokes equation, using the FLUENT - commercial CFD computer software. The numerical results for the electric field distribution, ion density, and flow pattern are shown for different values of non-dimensional numbers characterizing the process. The flow pattern generated by the EHD effect is asymmetric with respect of the transverse axis of ESP and generation of the forward wake can be observed, if the non-dimensional Ehd number is larger than 1710.
Last updated: May 10, 2009.
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