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US 2015/0203400 A1Published application
Process and installation for production of clinker and electricity, and process for modification of a production installation of clinker
AssigneeLafarge
InventorsMichel Gimenez, Franck Leroy
Life of this patent
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Abstract
A process and an installation for production of clinker and electricity, and a process for modifying a production installation of clinker are presented.
Claims9
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, this 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.
5 more elements
An installation for production of clinker and electricity, comprising:
- a raw meal feeding supply to supply raw meal;
- a clinkering kiln;
- at least two precalciners positioned in parallel between the raw meal feeding supply of raw meal and the kiln, adapted to precalcine the raw meal at a temperature of 750 to 950° C., each precalciner having:
- respective inlets for the raw meal, a fuel and a combustion agent,
- an outlet for the precalcined raw meal,
- an outlet for the precalcination flue gases, connected to an evacuation device of the flue gases;
- at least two cyclones respectively connected to the outlets of the precalciners;
- optionally at least one additional cyclone connected to the outlet of gases of the cyclone connected to at least one secondary precalciner;
- a generator of electric power comprising a steam turbine and a steam production apparatus for the production of steam, which are connected to the evacuation device of the flue gases of the cyclone connected to the at least one secondary precalciner, or which are optionally connected to the evacuation device of the flue gases of the additional cyclone,
- the steam production apparatus comprising:
- optionally an outlet of a flue gas connected to an inlet of the main precalciner or of the corresponding cyclone,
- optionally an outlet of flue gas connected to an inlet of the raw meal feeding supply means,
- at least one outlet of a dilution flue gas connected to an inlet of at least one secondary precalciner or to an inlet of at least one corresponding cyclone, and
- at least one outlet of a fraction of a precalcination flue gas having already transmitted their heat connected to an outlet of the precalcination flue gases of the cyclone connected to the at least one secondary precalciner or optionally to an inlet of at least one additional cyclone.
11 more elements
A process for modification of a production installation of clinker, the installation to be modified comprising:
- a raw meal feeding of supply to supply raw meal;
- a precalciner adapted to precalcine raw meal at a temperature of 750 to 950° C., the precalciner having an inlet of raw meal connected to the raw meal feeding supply of raw meal, an inlet of fuel and of a combustion agent, an outlet of the precalcined raw meal, and an outlet of the precalcination flue gases;
- a clinkering kiln of the precalcined raw meal, connected to the outlet of the precalcined raw meal of a cyclone which is connected to the outlet of the precalcined raw meal of the precalciner,
- the process for modification comprising:
- installing a secondary precalciner having respective inlets for the raw meal, the fuel and the combustion agent, an outlet of the precalcined raw meal, and an outlet of the precalcination flue gases,
- connecting to the raw meal feeding supply of the raw meal, the inlet of the raw meal of the secondary precalciner or of each secondary precalciner,
- connecting to a cyclone the outlet of the precalcined raw meal and the outlet of the precalcination flue gases of the secondary precalciner or of each secondary precalciner,
- connecting to the kiln, the outlet of the precalcined raw meal of the cyclone or of each cyclone connected to the secondary precalciner, and optionally of the additional cyclone,
- connecting the outlet of the precalcination flue gases of the cyclone connected to the secondary precalciner, or optionally of the additional cyclone, to a steam production apparatus, which is part of a generator of electric power,
- connecting an outlet of a dilution flue gas to an inlet of the secondary precalciner or to an inlet of at least one corresponding cyclone, and
- connecting an outlet of a fraction of a precalcination gas having already transmitted their heat to an outlet of the precalcination gases of the cyclone connected to the secondary precalciner, or optionally to an inlet of at least one additional cyclone.
8 more elements
Dependencies are inferred from the claim text.