Apparatus for the production of clinker from raw meal and relative process

Improved process for the production of clinker from raw meal in an apparatus comprising a rotary kiln (8), a multistage cyclone preheater (9) and an electrofilter (10), said process comprising the following operating steps:

• a) making the combustion fumes (11), from the rotary kiln (8), flow from bottom to top into the preheater (9);
• b) mixing the raw meal (22) with the combustion fumes (11) exiting the preheater (9), with preheating of the raw meal (14) by contact with the combustion fumes (11), and formation of a gas flow containing a partially preheated raw meal (14) in suspension;
• c) feeding the flow obtained in phase b) to the electrofilter (10) and separating the partially preheated raw meal (14) from a flow of combustion fumes cleaned of dust (15);
• d) feeding the partially preheated raw meal (14) obtained in step c) to the preheater (9) and preheating the raw meal (14) by contact in counter-flow with the combustion fumes (11) that flow from bottom to top;
• e) feeding the preheated raw meal (16) from phase d) to the rotary kiln (8) for the subsequent production of clinker and;
• submitting the combustion fumes cleaned of dust (15) exiting the electrofilter (10) to further pollutant purification treatments and/or heat recovery treatments, wherein said further pollutant purification treatments comprise a NOx lowering treatment and/or a sulphur oxide lowering treatment.