BLAST-HEATING APPARATUS AND PROCESS FOR REDUCING HEAT LOSSES FOR THERMAL STATIONS WITH FORCED DRAUGHT

摘要

The invention relates to a blast heating apparatus and to a process for reducing the heat losses for the thermal stations with forced draught, meant to heat the inlet air, particularly the air in excess, said apparatus being mounted to the exhaust gases outlet shaft. The blast-heating apparatus claimed by the invention comprises two metal tubes (), arranged concentrically, which are mounted on the exhaust gases outlet shaft of the thermal stations, by means of some rubber sleeves () and of a collar (), and the inner tube for the exhaust gases outlet, made by extruding from an aluminium alloy and processed at the ends for providing the attachment, is provided on the whole length with several fins () arranged longitudinally inside, and also with several fins () arranged longitudinally outside. According to the invention, the process has as purpose the reduction of losses, the inlet air being heated before the inlet into the combustion chamber of the thermal station by means of the flue gases by at least 10°C more than the temperature at the outer end wherefrom the inlet is carried out.