LEILAC (Low Emissions Intensity Lime And Cement) is a European Union Horizon 2020 (H2020) research and innovation project.
Calix’s technology is being piloted with the world’s largest cement and lime companies to mitigate their carbon dioxide (CO2) emissions dramatically without significant energy or capital penalty.Visit the LEILAC website
LEILAC is piloting a breakthrough technology that will enable both Europe’s cement and lime industries to reduce their emissions while retaining, or even increasing international and cross sectorial competitiveness.
Carbon capture is not yet included in the available technologies for cement and lime. The international and EU community recognises that CO2 emissions contribute to climate change, and the approach to reducing such emissions to-date for the cement and lime industries has been to increase kiln efficiencies and utilise alternative fuels. Once tested in LEILAC and scaled up, Direct Separation should reduce the costs of carbon capture considerably and accelerate the deployment in both industries.
Calix’s technology re-engineers the existing process flows of a traditional calciner, indirectly heating the limestone via a special steel vessel.
This unique system enables pure CO2 to be captured as it is released from the limestone, as the furnace exhaust gases are kept separate.
It is also a solution that requires no additional chemicals or processes, and requires minimal changes to the conventional processes for cement as it simply replaces the calciner.
As two-thirds of CO2 emission from cement production is generated from the limestone itself, this technology offers a unique opportunity as it can capture these emissions without significant energy or capital penalty. The energy losses associated with Direct Separation technology are primarily heat losses in the equipment, and CO2 compression (for transport and storage).
It also enables the use of carbon capture techniques, have already been developed by the power sector to be applied to the heating emissions.
This innovation requires minimal changes to the conventional processes for cement, replacing the calciner in the Preheater-Calciner Tower. For lime there is no product contamination from the combustion gas. The technology has the potential to be used with alternative fuels and other capture technologies to reach the targeted 80 percent emission reduction in 2050.