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Capturing CO2 from cement and lime production

Lixhe cement plant

Consortium secures €12 million EU funding to demonstrate breakthrough carbon-capture technology

LEILAC – the Low Emissions Intensity Lime And Cement consortium – has successfully secured €12 million in funding over five years from the European Commission’s Horizon 2020 grant programme.

The consortium – led by technology providers Calix and comprising HeidelbergCement, CEMEX, Tarmac, Lhoist, Amec Foster Wheeler, ECN, Imperial College, PSE, Quantis and the Carbon Trust – aims to apply and demonstrate a breakthrough technology that will allow Europe’s cement and lime industries to reduce their carbon footprint significantly.

 

The cement industry alone is said to account for up to 5% of global carbon dioxide (CO2) emissions, while the lime sector has the highest CO2 intensity relative to turnover. For years, both the cement and lime industries have made continuous efforts to improve their environmental performance and have successfully reduced CO2 emissions from the production process.

Nevertheless, as around 60% of CO2 emissions are released directly and unavoidably from the processing of the raw materials, cost-effective carbon capture technologies are needed on a large scale, to help reach the EU’s 80% emissions reductions target by 2050. The LEILAC project aims to help the European industry to achieve these targets effectively and economically, and the consortium will contribute a further €9 million towards the project.

Calix’s Direct Separation process is said to provide a common platform for carbon capture in both the lime and cement industries. This can help these sectors to thrive in the face of tighter international CO2 emissions regulations, where the only options may be to capture and store CO2 instead of emitting it into the atmosphere.

Two-thirds of CO2 emissions from cement and lime production are generated through the breakdown of limestone into lime and CO2 in furnaces. Calix’s technology re-engineers the existing process flows, where it is capable of capturing almost pure CO2 released from the limestone – potentially with no additional energy costs or environmental impact.

The system design is unique, as the furnace exhaust gases are not in direct contact with the limestone. In this indirectly heated reactor, the energy from the heating gases is transferred to the limestone via a special steel vessel. The CO2 released from the limestone can, therefore, be separated in an almost pure form, offering a unique opportunity as the technology can capture these emissions without significant additional costs or increased energy use.

The technology is said to complement other carbon-capture methods already developed in the power and cement sector, such as oxyfuel, and can make use of alternative fuels.

During the first three years, the project will focus on finalizing the design of the demonstration plant, to be constructed at HeidelbergCement’s Lixhe plant, in Belgium, once the necessary permits have been secured. The high-temperature Direct Separation calciner pilot unit will then undergo two years of extensive testing in a standard operational environment.

Fundamental research on the process demands and performance will be carried out to demonstrate that the technology works sufficiently and robustly enough to be scaled up to full operational use. The project results will be shared widely with industry at key intervals during the testing.

 

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