Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
LKAB is a company that mines and refines iron ore in the northern parts of Sweden. They are producing the world’s most energy efficient iron ore pellet but still has committed to reduce their emissions of CO2 as well as their energy use per ton produced pellet until the year of 2020. The pellet plants stands for the highest amount of energy use in the company and also has the highest emissions of CO2. Therefore it is important to make the pellet plants more energy effective to be able to reach the goals for 2020. Ongoing work with energy efficiency on pellet plant KK2 will later continue on all other parts within the company, including pellet plant KK3. This report consists of the first phase of LKAB´s work with energy efficiency which includes a flow scheme, a consumption matrix and a list of measurement points in the plant as well as a mass- and energy balance. The purpose with this report is therefore to work as a basis for further work with energy efficiency in KK3 later on. The results from the consumption matrix shows that it is the hot part of the plant that should be prioritized when it comes to working with energy efficiency. This is because of the fact that the rotary oven, kiln, stands for all the usage of fuels (coal and oil) which is the type of energy that has the highest energy use and therefore also is the most expensive. The process fans in the oven and cooler part also stands for the highest use of electricity in the plant. The proportion of measurement points in the plant that is considered to be measured in a reliable way is 49 % which means that there is room for improvement when it comes to receiving trustworthy data. More measurement points could be added in the plant which would contribute to safer calculations and more knowledge about all the mass and energy flows. The result of the water balance shows a difference of 23 % which probably depends on the fact that water is added in the process through the scrubbers that cleans the gas from particles. There are no measurement on the amount of water added in the scrubbers. The coal balance resulted in a difference of 6 % which depends on the amount of coal in the raw pellet which is hard to define. The iron balance shows that there are about 1 % losses which consists of dust.Losses in the energy balance was amounted to 30 % of incoming energy. These losses consists of radiation and convection losses from the grate and kiln and of the energy that is needed for calcination.
Place, publisher, year, edition, pages
2014. , 57 p.
IdentifiersURN: urn:nbn:se:ltu:diva-54428Local ID: b61a37e5-b58e-44a4-beba-7e3b5596fc32OAI: oai:DiVA.org:ltu-54428DiVA: diva2:1027809
Subject / course
Student thesis, at least 30 credits
Sustainable Energy Engineering, master's level
Validerat; 20140716 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved