Abstract
Height of temperature of flue gas to be treated by ESP depends on the kinds of industrial furnaces and technology. Because temperature greatly affect corona characteristics varying with temperature. This will be helpful to determine the parameters of DC power supply, especially the voltage level and the power capability under the condition of some certain temperature range of flue gas. To get the corona characteristics of onset voltage, breakdown voltage and corona current varying with temperature, a series of experiments and theoretic analyses have been carried out, the results of both experiments and theoretic analyses are reported in this paper. This will be of great significance for both design and application of ESP.

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Monte Carlo simulations of the particle motion, coupled with CFD predictions of the turbulent EHD flow within the ESO, were used to simulate the performance of the experimental precipitator and ESPs of similar scale, with varying wire configurations, for poly-dispersed particulate phases in the size range [1m m, 20m m]. It was found that , for a constant plate current density, increased uniformity of the discharge field produced higher collection efficiencies due to more uniform charging of the particulate phase.

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Abstract
The verification of ESP models is very important to ensure the validity of the computational method. For that reason series of measurements using laser Doppler velocimeter are made for the determination of particle velocity field of an ESP model.
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In this paper analysis of the velocity field measurements, influence of the electric field on particle dispersion are presented. Laser Doppler Anemometry is applied for velocity field measurement in various streamwise and transversal positions in one channel of a model ESP.

Comparison of measurement and computation with/without electric field is also presented in the paper. This paper is focused especially on the near-wall and near-electrode regions where the influence of ionic and particle flow on the turbulence are significant.

The turbulence modification phenomenon due to the charged particles is theoretically analyzed, too. Based on the measurements and theory, it is further confirmed that the secondary flow of the charged particles is considered to be an important factor in particle dispersion and turbulence modification procedure, and it is needed to take into consideration more precisely when modeling.

The level of turbulence modification can be determined from the measurements and it can be shown that the overall performance and efficiency of the precipitation process can be highly influenced e.g. by changing of the particle concentration or applied electric field strength.

Using the results of the measurements, the computational method worked out [Proc. Of ICESP VII, pp. 196-205.] can be reviewed and its results can be compared to the measured ones. The extended knowledge of particle dispersion and turbulence modification in ESP serves as a basis of further development of our calculation.

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Abstract
The motion which strongly affects the distribution of charged particles in an electrostatic precipitator is first investigated using a laboratory model with barbed ionizing electrodes. The flow visualization reveals a vigorous well organized roll-like secondary flow. A simple 2-D numerical model confirms that the typical velocity of this secondary flow can be up to about 1 m/s. An exploratory numerical investigation is performed on the influence of this vigorous secondary flow on the trajectories of fine particles, on the location where they reach the collecting plates and on the charge they gain during their transit.

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