Patent ID: 8137100
Filing Date: 2012-03-20
Classification: C04B,F27B,Y02P

Abstract:
1. An installation for manufacturing cement clinker from raw meal which is treated thermally in a combustion process by preheating, calcining, sintering and cooling stages, with an exhaust gas stream of the sintering stage and an exhaust gas stream of the cooling stage in the calcining stage which is supplied with fuel is used to calcine the raw meal, including a calcining combustion chamber with secondary fuel introduced into an upper side of the chamber and a tertiary partial airstream with sub-stoichiometric fuel combustion being integrated in the calcining stage in order to form a CO-containing reduction zone for reducing a pollutant NO x , and an underside of the combustion chamber being connected via a connecting line to a lower region of a rotary kiln exhaust gas rising line, comprising: a) the calcining combustion chamber having an upper raw-meal-free reducing zone with a feed for secondary fuel arranged at the upper side of the combustion chamber, and a first tertiary partial airstream with sub-stoichiometric fuel combustion for the purpose of gasifying the secondary fuel, b) the combustion chamber having a lower zone, an inflow of at least one raw meal partial stream and of a second tertiary partial air stream being arranged in a junction region between the upper raw-meal-free, reducing zone and the lower zone, c) a height of the upper, raw-meal-free zone of the combustion chamber in relation to a height of the lower zone having a ratio of 5:1 to 1:1, d) a third tertiary partial airstream line and a second raw meal partial stream passing into the rotary kiln exhaust gas rising line above a junction of a combustion chamber connecting line and the rotary kiln exhaust gas rising line in the upper region of the combustion chamber, and e) each of the three tertiary partial airstream lines is assigned an actuating element for regulating a respective tertiary air flow rate.