Published September 17, 2019 | Version v1
Conference paper Open

CLEANKER project: CO2 capture in cement plant by CaL process

  • 1. BUZZI
  • 2. Politecnico di Milano
  • 3. LEAP


The cement industry is a key-sector for the reduction of CO2 emissions. According to IEA and ZEP
studies, cement industry should contribute to the largest CO2 emission reduction through CCS in
Europe, in order to meet the target of 2°C of global temperature increase. In addition to oxyfuel
combustion and post-combustion solvent-based capture technologies, which have
attracted most of the research efforts up to now, Calcium looping (CaL) is recognized as the most
emerging technology for CO2 capture in cement plants. The process comprises two basic steps: (1)
“carbonation” of CaO to form CaCO3 in a reactor operating around 650°C; (2) oxyfuel calcination in a
reactor operating at 920-950°C, which makes the CaO available again and generates a gas stream of
nearly-pure CO2.
The paper illustrate the advancement of the CLEANKER project, aimed at demonstrating the CaL
concept in a configuration highly integrated with the cement production process, making use of
entrained flow reactors and compare it's impact (CO2 saving and cost increase) with innovative
clinkers under investigation (CSA and Belitic clinker).
The core activity of the project is the design, construction and operation of a CaL demonstration
system comprising the entrained-flow carbonator (the CO2 absorber) and the entrained-flow oxyfuel
calciner (the sorbent regenerator). This demonstration system will capture the CO2 from a portion of
the flue gas of a cement plant) operated by Buzzi Unicem, using as CO2 sorbent the same raw meal
used for clinker production



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