Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Investigation of Electric Wind in the Corona Charging Unit of a Novel Electrostatic Collector.

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Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Investigation of Electric Wind in the Corona Charging Unit of a Novel Electrostatic Collector An. M. Bologa, H.-R. Paur, K. Woletz Forschungszentrum Karlsruhe GmbH, Institut für Technische Chemie, Postfach 3640, D-76021, Karlsruhe, Germany 5th Electrohydrodynamics International Workshop Poitiers, France, August 30-31, 2004

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Flue gas cleaning Separation process in the one stage ESP Separation process in the CAROLA collector Separation process in the two stage ESP Advantages of the CAROLA: -One operation electric field; -Low operation voltage; -Strong electric field and effective particle charging in the charging zone; -Module principle of design.

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft CAROLA collector Particle charging Gas Charged particle transport Charged particle collection

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Test of the CAROLA collector for oil mist Particle number concentration and fractional collection efficiency, Q=520 m3/h, U=16,4 kV, I= 6,2 mA

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Task of investigations The behaviour of the particles in the charging zone depends on: physical properties of the gas and particles, gas velocity, temperature, relative humidity charging system geometry, voltage and corona current, electrohydrodynamic phenomena, etc. In the present article an electric wind in the charging system of the CAROLA collectors is investigated.

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Test facilities

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Results of investigations Current-voltage characteristics of the ionization section, flow rate for Dn=0,05 m is up to 106 m3/h, for Dn=0,04 m is up to 68 m3/h and for Dn=0,03 m is up to 38m3/h

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Electric wind and air velocities Maximum electric wind and air velocities in the measurement points, Dn=0,05 m and H=0,03 m

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Influence of the distance H to electric wind velocity Maximum electric wind velocity for different distances H

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Dependence of maximum electric wind velocity on the distance from the charging system, U=19,9 kV, I=0,36 mA

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Influence of applied voltage on electric wind velocity Dn=0,03 m Dn=0,04 m Dn=0,05 m Dependence of the maximum electric wind velocity and corona current on applied voltage, H=0,03 m

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Electric wind in the pilot charging unit (I) Schema of the measurement

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Electric wind in the pilot charging unit (II) Dependence of the electric wind velocity and corona current on applied voltage in the pilot charging unit

Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Conclusions The electric wind velocity in the charging system needles in the nozzles increases with increase of the applied voltage. At distances H=Dn the electric wind velocity downstream the charging system is constant in the measurement points. The electric wind can change air velocity in the centre part of the flow downstream the nozzles. With increase of the distance from the charging unit the electric wind velocity decreases. The electric wind does not influence on the charged particle transport in the CAROLA collector at the distances H=3Dn.