Carbon dioxide capture from a cement manufacturing process
AssigneesSavannah River Nuclear Solutions, LLC, Clemson University
InventorsGerald C. Blount, Ronald W. Falta, Alvin A. Siddall
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Abstract
A process of manufacturing cement clinker is provided in which a clean supply of CO2 gas may be captured. The process also involves using an open loop conversion of CaO/MgO from a calciner to capture CO2 from combustion flue gases thereby forming CaCO3/CaMg(CO3)2. The CaCO3/CaMg(CO3)2 is then returned to the calciner where CO2 gas is evolved. The evolved CO2 gas, along with other evolved CO2 gases from the calciner are removed from the calciner. The reactants (CaO/MgO) are feed to a high temperature calciner for control of the clinker production composition.
Claims4
A process for the production of cement clinker which comprises the steps of:
- heating the limestone/dolomite components of the a clinker feed in a first calciner at a temperature of between about 650° C. to about 1050° C., said calciner containing no combustion gases;
- removing a portion of a CaO/MgO reaction product from said calciner;
- using said removed CaO/MgO to capture CO2 from fuel combustion flue gas associated with said cement production process, thereby generating a supply of CaCO3/CaMg(CO3)2;
- introducing said supply of CaCO3/CaMg(CO3)2 from said flue gas environment into said first calciner, said CaCO3/CaMg(CO3)2 thereby releasing CO2;
- removing released CO2 from said calciner;
- and,
- removing additional reaction products from said calciner and subsequently exposing said reaction products in a second calciner to a temperature of between about 1300° C. to about 1450° C. until clinker is formed.
Dependencies are inferred from the claim text.