Application of an electric charge injector to the flue gas conditioning in dust separators
A new method for injecting electric charges into raw gas flows, recently developed in France as a spin-off of aerospace research, was used to precharge dust in various types of dust separators. The improvement obtained by applying this method to various types of dust separators was studied first in the laboratory. A significant increase in collection efficiency was obtained in a polarised granular bed filter, with the raw gas at temperatures up to approximately 300 C. The improvements obtained in a conventional electrostatic precipitator and in two types of scrubbers could easily have been attained, at lower cost, by increasing the high-voltage and the liquid-to-air ratio, respectively. The most interesting result was obtained in a fabric filter, where the pressure drop for a given dust loading on the fabric was drastically reduced by precharging. An industrial scale test was performed with a fabric filter rated for 2,400 m3 of raw gas per hour. The maximum pressure drop across the filter was kept constant. It was shown that a precharging current as low as 10 micro-Amperes was sufficient to decrease the cleaning frequency by 30%, or increase the air-to-cloth ratio by 10 to 30%.
Bibliographic Reference: EUR 13684 EN (1991) 87 pp., FS, ECU 8.75
ISBN: ISBN 92-826-3259-8
Record Number: 199210011 / Last updated on: 1994-12-02
Original language: en
Available languages: en