Method and installation for producing lime or dolime

Installation for the production of lime or dolime, comprising at least one kiln, each of which comprises

• a top supply for a calcareous or dolomitic material,
• a calcination zone wherein said calcareous or dolomitic material moves downwards and is calcined into lime or dolime in contact with first fumes obtained by combustion of fuel in the presence of an oxidizing gas,
• a cooling zone for cooling the downwards moving calcined lime or dolime,
• a bottom discharge for collecting said cooled calcined lime or dolime, as main value product, and
• a top exit for a released gaseous effluent containing CO2,
• characterized in that said installation further comprises
• a carbonation reactor containing a sorbent material based on CaO,
• means for transferring said gaseous effluent containing CO2 from said top exit of said at least one kiln to said carbonation reactor, wherein the gaseous effluent is passed through said sorbent material which captures CO2 and forms by carbonation a CaCO3—CaO based charge and a CO2-depleted gaseous effluent,
• a first separation device which, at the top of the carbonation reactor, separates said CaCO3—CaO based charge from the CO2-depleted gaseous effluent and removes this gaseous effluent,
• a calcination reactor which, via a transfer duct, is supplied with said CaCO3—CaO based charge coming from the first separation device and in which said CaCO3—CaO based charge comes into contact with second fumes obtained by combustion of a fuel chosen from the group consisting of the gaseous fuels and the solid and liquid fuels having an ash content less than 7 wt % and a sulphur content less than 1.5 wt % in the presence of dioxygen and CO2, as oxidizing gas, with, by decarbonation of CaCO3, formation of said CaO-based sorbent material and release of CO2,
• a second separation device which, at the top of the calcination reactor, separates said CaO-based sorbent material resulting from said decarbonation and a CO2-concentrated gas stream which is formed of said second combustion fumes and of the CO2 released during said decarbonation of CaCO3, and removes this CO2-concentrated gas stream for collection,
• a recycling duct through which the CaO-based sorbent material from the second separation device is fed to the carbonation reactor, and
• an extraction duct, which is arranged to extract and collect, from said transfer duct, a fraction of said CaCO3—CaO based charge, as auxiliary value product, a source of compensatory fresh CaCO3 being provided for supplying the calcination reactor.