The cement industry is a key sector where CO2 emissions could be substantially reduced. CO2 generated in the process of cement production cannot be fully disregarded due to the calcination of limestone (CaCO3 dissociated to CaO and CO2), the most important raw material. According to studies carried out by the International Energy Agency (IEA) and the Zero Emission platform, cement industry should contribute to the largest CO2 emission reduction in Europe through carbon capture and storage, in order to meet the target of limiting of global temperature increase to not more than 2°C (IEA '2DS scenario').
The CLEANKER project will demonstrate the Calcium Looping (CaL) concept, one of the most promising technologies for CO2 capture in cement plants, by making use of entrained flow reactors. The project's core activity is the design, construction and operation of a CaL demonstration system that will capture the CO2 from a portion of the flue gas of the cement plant in Vernasca (Italy), using as CO2 sorbent the same raw meal that is used for clinker production.
The main goals of the projects are:
• CO2 capture efficiencies higher than 90%,
• electric consumption max. 20% higher than in a cement plant without capture (thanks to heat recovery in the CaL process and power generation),
• SPECCA below 2 MJLHV/kgCO2,
• keeping the cost of CO2 avoided below 30 €/tCO2
• an increase of cost of cement to max. 25 €/t.