Process and installation for production of clinker and electricity, and process for modification of a production installation of clinker

A process for production of clinker and electricity, comprising:

• introducing a raw meal, fuel and a combustion agent, in at least two precalciners positioned in parallel;
• precalcining the raw meal at a temperature of from 750 to 950° C., in order to obtain precalcination flue gases and a precalcined raw meal;
• treating the precalcination flue gases and the precalcined raw meal towards respective cyclones, in order to obtain precalcination flue gases and a precalcined raw meal;
• clinkerising the precalcined raw meal, in order to obtain clinker;
• producing steam, by transmission of heat from at least one part of the flue gases coming from at least one secondary precalciner and the corresponding cyclone;
• producing electricity from the steam, using an electricity generator comprising a steam turbine and steam generator;
• varying the feed rate of raw meal and/or the flow rate of fuel and/or the flow rate of combustion agent in at least one secondary precalciner, to vary the quantity of electricity produced, and
• introducing into at least one secondary precalciner, a flow of a dilution flue gas, the flow being formed from one part of the precalcination flue gases having already transmitted their heat, wherein the precalcination flue gases coming from the at least one secondary precalciner and the corresponding cyclone are diluted, before transmitting their heat, to obtain diluted precalcination flue gases, with a fraction of the precalcination flue gases having already transmitted their heat.