Simulation, Validation and Analysis of a Pot Furnace Plant at LKAB Malmberget: A Result Validation between Pot Furnace and Simulations
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
For over 125 years, LKAB has been an important part of Sweden’s growth and export. The company has the most carbon efficient iron ore refining processes in the world and is one of the world’s leading supplier of iron ore pellets, still LKAB wants to reduce carbon dioxide emissions by 37 percent per ton of product by year 2020. The sintering of iron ore pellets stands for 54 percent of company’s energy input and over 70 percent of the carbon dioxide emissions which proves why focus is needed to achieve these goals. During one week, several individual cases were tested in LKAB’s pot furnace plant, which simulates a pelletizing plant. Analyses were done over the results about off-gas temperatures, bed temperatures, water evaporation and oxidation of magnetite. MATLAB routines were implemented and used as an interface for the simulation program BEDSIM. Simulations were done with the same input parameters as in the pot furnace experiments to validate the simulation model. Unfortunately, a lack of measurements in the pot furnace about the water content in outgoing gases made it impossible to analyse the amount of water evaporated from the bed, so no validating comparison between BEDSIM and pot furnace data is done regarding that subject. In overall, the results show good agreement between BEDSIM and pot furnace. The off-gas temperature difference can be justified by heat losses and placement of measuring equipment. The bed temperature in pot furnace is affected by the gas temperature, so the resulting temperature remains between actual material- and gas temperature. Surprisingly good agreement is found for the estimation of magnetite content after each case from the measure of the oxygen difference in pot furnace gases, and also from simulations. The largest differences between pot furnace measurements and BEDSIM simulation are due to the placement of the experimental equipment. Other significant factors are the effect of gas on the thermocouples and the heat losses to surrounding material between combustion chamber and bed.
Place, publisher, year, edition, pages
MATLAB, Validation, LKAB
Engineering and Technology
IdentifiersURN: urn:nbn:se:ltu:diva-308OAI: oai:DiVA.org:ltu-308DiVA: diva2:972619
Sustainable Energy Engineering, master's level