Project has reduced CO2 emissions from Swedish lime kilns
Carbon dioxide emissions from lime kilns in Sweden have been reduced by more than 36 000 tons per year. This has been achieved through a collaboration between the Centre for Sustainable Cement and Quicklime Production at Umeå University, Nordkalk AB and the Swedish Energy Agency.
Text: Anna-Lena Lindskog
Through collaboration between the Centre for Sustainable Cement and Quicklime Production at Umeå University, Nordkalk AB and the Swedish Energy Agency, carbon dioxide emissions from lime kilns has decreased.
"The project focuses on implementing biofuels as an alternative to fossil fuels in lime kilns, which has been very successful" says Matias Eriksson, director of the Centre for Sustainable Cement and Quicklime Production and adjunct associate professor at the Department of Applied Physics and Electronics at Umeå University.
The project "Renewable Energy Carriers in Quicklime Production" aims to investigate and demonstrate how biofuels can be introduced as an alternative to fossil fuels in lime kilns. The aim is to reduce fossil carbon dioxide emissions in the production of quicklime by promoting the use of renewable energy carriers, such as forestry or agricultural residues, or refined biofuels.
The project focuses on implementing biofuels as an alternative to fossil fuels in lime kilns, which has been very successful
"The project goal is to reduce carbon dioxide emissions from non-renewable energy carriers in Nordkalk AB's quicklime production by 46 percent, which corresponds to 71,000 tons of carbon dioxide per year" says Matias Eriksson.
To achieve this, the project has set two sub-goals, to implement 100 percent renewable energy carriers at Kalkproduktion Storugns AB's (KPAB) lime kiln in Lärbro, and to integrate 30 percent renewable energy carriers at Nordkalk AB's lime kiln in Köping.
"Nordkalk has achieved remarkable success in replacing coal with biofuels at the lime kiln in Köping" says Matias Eriksson. ”The kiln in Köping, which produces high-quality lime for steel and pulp customers, has exceeded the target of 30 percent of the fuel being biomass and is now working to reach 50 percent. Trial runs with 100 percent liquid biofuel are also being conducted at KPAB on Gotland, a company in which Nordkalk is the majority shareholder. These tests aim to evaluate the suitability of the biofuel for continuous operation.”
In addition to providing practical implementation support to Nordkalk and KPAB, researchers and PhD students at the Centre for Sustainable Cement and Quicklime Production have conducted laboratory studies investigating selected biofuels in a simulated industrial environment.
"These studies evaluate the impact of biofuels on limestone, quicklime and refractory materials under controlled conditions, providing a detailed understanding of the possibilities and limitations of fuel switching" says Markus Broström, Professor at the Department of Applied Physics and Electronics at Umeå University.