Process of making cement clinker and apparatus for performing said process

Abstract

A process for producing cement clinker, having a preheating-, calcination and cooling zone, under addition of a secondary fuel, (retardedly)combustible components such as waste materials and/or conventional fuels being added in the zone between kiln inlet and calcination zone and then being subjected to an incomplete combustion and/or pyrolysis under addition of exhaust gases from the burning process. The gases thus formed are introduced into the calcination zone as secondary combustion gas together with the exhaust gas from the burning process and are burned there with tertiary air and optionally with conventional secondary fuel. The plant required for performing the process consists of a system of heat exchangers (2), a calcining kiln (3a), a burnin kiln (10) and a clinker cooler (13). The calcining kiln (3a) is provided with a means (4) for introducing tertiary air and/or oxygen preferably preheated (m) in the clinker cooler (13) and optionally with a means (15) for introducing a conventional fuel. At least one each line (7) is provided for the introduction of raw material into the kiln and at least on each line (6) is provided for discharging the exhaust gases formed in the combustion of the primary fuel in the kiln (10) and of the fuels added. A means (8) is provided in the area between kiln inlet (9) and calcination zone for the introduction of the additional fuels.

Dependencies are inferred from the claim text.