RING SHAFT KILN FOR FIRING LIME WITH RECIRCULATION OF KILN GASES

摘要

A ring shaft kiln for firing lime with recirculation of kiln gases is carried out in the manner to have a gas recirculation channel between an exit gas channel (21) from a recuperator (3) and a secondary air feeding pipes leading to lower (7) and upper (15) burners. A blower (22) enables the flow of recirculation gases over control flaps (23) and mixing chambers (24) to the lower (7) and upper (15) burners. Recirculation gases are taken from the exit gas channel (21) on the place of their highest temperature directly at the exit from the recuperator (3). All recirculation components are thermally insulated so that their surface temperature does not exceed 40 degrees Celsius.