LOWER CYCLONE HEAT EXCHANGER

摘要

The lower, that means in high reduced, heat exchanger according to the invention is composed from a system of cyclones for preheating and following separation of powdered raw material before its next thermal processing, where the exchanger is divided into two parts, to a high temperature part (1) and to a low temperature part (2), mutually interconnected with an interconnecting tube (4) of hot gas. According to the invention the lowest and in connection to the direction of hot gas stream input members of low temperature part (2) is a counter current shaft exchanger (20), the input (20) of which is situated under the level of hot gas output (131) from the highest cyclone (13) of high temperature part (1). The heated up powdered raw material is transported from the low temperature part (2) into the high temperature part (1) by means of a transport tube (50), to which the hot gas stream is led, where to this stream the powdered raw material from the output (202) of counter current shaft exchanger (20) is led. To the output tube (41), arranged between the input chamber (30) of a rotary kiln (3) and the first cyclone (11) of high temperature part (1) are further according to the invention advantageously the fuel input (6) and the input (60) of combustion gas and/or input (51) of hot gasses and precalcined raw material ended.