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ICESP X CONFERENCE PAPER ABSTRACTS 2A 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 2A Series papers from the X ICESP Conference.  

2A1
THE INFLUENCE OF FLOW DISTRIBUTION ON THE
PERFORMANCE IMPROVEMENT OF ELECTROSTATIC
PRECIPITATOR
S M E HAQUE, M G RASUL, A DEEV, M M K KHAN2 and J ZHOU

Abstract

Particulate matter emission is one of the major air pollution problems of coal fired power plants. Though fine particles constitute a smaller fraction by weight of the total suspended particle matter in typical particle emissions, they are considered potentially hazardous to health because of their high probability of deposition in deeper parts of the respiratory tract. Electrostatic precipitators (ESP) are the most common, effective and reliable particulate control devices which can handle large gas volumes with a wide range of inlet temperatures, pressures, dust volumes and acid gas conditions. Though the electrostatic precipitators are generally running at the collection efficiency as high as 99.95%, the anticipated regulations on particulate matters of 2.5 microns (PM2.5) have led the local power station to explore improvement options to further control the emissions of the fine particulate at a minimum cost even its current particulates emissions are well under the limits of its current environmental license. The performance of Electrostatic Precipitator (ESP) is significantly affected by its complex flow distribution. In this study the gas flow through the ESP at a local power station is modelled numerically using computational fluid dynamics (CFD) code Fluent to give insight to the flow behavior inside the ESP. The flow simulation was performed using the Realizable k-e model. The results of the simulation are discussed and compared with on-site measured data supplied by the power plant.

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2A2  
MODEL EXPERIMENTAL RESEARCH ON SKEWED GAS-FLOW TECHNOLOGY
XU GUOSHENG, HE JIAN, LI LIMEI, GUO HUI AND LI ZHE

Abstract

Aiming to the research project of renovation of electrostatic precipitators for large-scale Sinter of iron and steel plants, this paper has carried out model experiments through installing guide plates and baffler to adjust the airflow inside precipitator to the predestined skewed profile pattern and analyzed the impact of adjusting device on airflow distribution and finally ascertained the executive plan of skewed gas-flow technology (SGFT).

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2A3  
SECONDARY FLOWS AND TURBULENCE FOR STAGGERED AND
NON-STAGGERED ELECTRODE EMITTERS
NIELS F. NIELSEN, POUL S. LARSEN AND CHRISTER LÖFSTRÖM

Abstract

Simulation models for sizing ElectroStatic Precipitators (ESPs) have been presented for the last 15 to 20 years. But still today the majority of the models are two-dimensional or semi-two-dimensional. Such restrictions exclude the possibility for investigating the influence of the physically important secondary flows (‘ion winds’) induced by the electric field. Secondary flows aid or oppose particle motion towards the collecting plates which along with turbulent diffusion play an important role in the resulting computed particle emission from a given ESP. But secondary flows are also found to determine the level of turbulence, which affects directly the coefficient of turbulent diffusion since this is often assumed to be proportional to the eddy diffusivity of momentum exemplified by the k,e- model. 

Experimental results obtained in a 0.2x0.2 m by 1.0 m long, seven-electrode laboratory scale model ESP at low particle load are used to first verify the reliability of the present CFD-model for staggered and non-staggered electrode emitters, in terms of current-voltage-characteristics, current density at collecting plate, turbulence level, and strength of secondary flows. Then parameter studies illustrate how the level of turbulence and the pattern and strength of secondary flow change, both along the ESP for fixed current and at the downstream station for increasing current. The distribution and magnitude of the turbulent diffusivity as well as computed efficiency are discussed.

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