Trace Elements Removal from Hot Flue Gases

摘要

Granular-bed filtration was investigated theoretically and experimentally with the view to its applicability to gaseous trace element removal at high temperatures. Granular-bed filters have received a great deal of attention recently as an alternative to the more conventional gas cleanup devices such as cyclones, electrostatic precipitators and bag-filters. None of these conventional devices is capable of operating efficiently at high temperatures, (800-900 C), typical of combined-cycle power generation plants. Moreover, a sizeable proportion of the volatilized trace metals will exit from the reactor in the vapor phase and these purification devices are not generally designed to remove the gaseous species. In an atmospheric test rig, trace elements of concern were removed in a fixed granular-bed filter at 800-900 C temperature range using sorbent particles (such as limestone) as the unbonded filter medium. Two configurations of the experimental apparatus were employed to enable an accurate determination of the removal efficiency of various sorbent particles. (Copyright (c) Valtion teknillinen tutkimuskeskus (VTT) 1989.)