Cement rotary kiln with high temperature heat exchanger for the zone decarbonization

摘要

The invention relates to the field of enhancement of heat transfer in the rotary kiln, in particular to the design and arrangement of the complex heat exchange devices in the decarbonization zone with the gas stream temperature of 1250-1400 ° C. The invention is aimed at intensification of heat transfer in the decarbonization zone, increased furnace productivity, increased shelf life and mixing. The offered rotary kiln comprising oblique lined on the inside a cylindrical body with heat exchanger and mixing in the form of flanges and situated at the cold end of the chain curtain. Inside the furnace in a gas stream with a temperature of 1250-1400 ° C a heat exchanger arranged in the form of ceramic and mixing shelves. Shelves preferably uniformly distributed over the inner surface of the furnace. Number of shelves satisfies provide lifting and feeding the gas stream is not more than 50% of the material. Directly behind and mixing shelves located threshold whose height covers not more than 50% of the effective cross-section of the furnace. threshold length does not exceed the diameter of the furnace height and mixing ceramic shelves should not exceed a threshold height. Rotary furnace lining may be provided with an additional heat exchanger disposed downstream of the movement of the material that the chain curtain.