in a responsible manner
The production processes of the mining and lime industry are energy intensive. Quarrying, crushing, grinding and calcination of limestone all require significant amounts of energy. Nordkalk continuously strives for improved energy efficiency, which can be reached through optimised processes and capacity utilisation, and by making reduced energy consumption a priority in new investments and repairs.
Reduced energy consumption through optimised processes and capacity utilisation
Automatic process optimisation into use at the kiln in Pargas
The automation system of the limekiln in Pargas was renewed in 2016; the new automatic optimization system adjusts the kiln’s operation parameters for obtaining uniform quality and low energy consumption.
The system monitors constantly the measurements of the process and product quality in order to level out changes in the process. It also decreases the possibility for production interruptions. The automatic process optimization has been calculated to save annually upto 4000MWh heath energy
Biofuel tested at Ignaberga in Sweden
In 2015, Nordkalk tested the use of biofuel at its facility in Ignaberga. The fuel is a surplus product from ecological feed production. The tests have given good results, and so in 2016, Nordkalk invested in equipment to adjust the production and equipment for the switch from fossil fuels to biofuels. The stone drying in Ignaberga runs now 100% on biofuel.
The tests have given good results for both the environment and Nordkalk.
Nordkalk was granted climate investment support for the Ignaberga project by the Swedish Environmental Protection Agency in December 2015. The support was granted in the context of the Climate Leap (Klimatklivet), an effort to reduce greenhouse gas emissions. Nordkalk is one of twelve companies receiving support for "measures that demonstrate the greatest sustained reduction of greenhouse gas emissions per crown invested".
About a third of the energy Nordkalk consumes comes from coal, which is used in lime burning, as are oil, natural gas and coke oven gas. Electricity is used for crushing and grinding, and fuel oil, natural gas and liquid petroleum gas for the drying process.
Improvements in 2016
The most significant energy efficiency improvements in 2016 were related to
Pargas kiln: Process optimisation and new textile filter improves energy efficiency
- Tytyri kiln: false air from the flue gas system was reduced with better sealing; process optimisation was updated.
By changing mercury-arc lamps to LED lamps, energy efficiency of lighting improved at several locations.
- In Storugns and at KPAB, energy was saved by changing electric motors to more energy efficient models, improving lubrication and cutting down idling.
In Rakke, lime grinding was optimised and waste heat is used to warm up the facilities.
Nordkalk is the leading limestone company in Northern Europe. We deliver essential raw materials to numerous industries, and our solutions contribute to clean air and water as well as productivity of agricultural land.