Experimental Studies on WFGD Sewage Injection Upstream of Electrostatic Precipitator
M. Jędrusik, M. Głomba, A. Świerczok, J. Mazurek, and P. Halfar
FLSmidth A/S, Airtech, Denmark
Abstract- The paper presents a method of utilization of cleaned sewage from flue gas wet desulfurization (WFGD) treatment plant. For this purpose a sewage injection system has been designed and installed at the inlet of an electrostatic precipitator (ESP). For a horizontal flue gas duct, the designated operational parameters of the sewage injection system, such as the permissible drop of temperature, evaporation time of the sewage drops, and the length of zone to complete evaporation have been determined. Preliminary studies have shown that an injection of about 2.0 m3/h of sewage caused the flue gas temperature to decrease of about 5oC, without disturbing the operational parameters of ESP. Moreover, in the fly ash retained in the electrostatic precipitator an increase in the content of particles with large diameter has been observed, whereas the characteristic chemical parameters of the dust have not been altered. The experimental work on the dust collection efficiency and dust emission, using this test installation, will further be continued.
Keywords- Electrostatic precipitator, sewage, collection efficiency, fly ash