Torrgranulering av slagg: Experimentell och numerisk modellering
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Dry granulation of blast furnace slag with a rotating disc is a method where hot slag is poured onto a rotating disc. By the rotation the slag is thrown radially to the side of the disc and is atomized into particles. Through dry granulation of blast furnace slag it is possible to produce a valuable product, cement, while the energy from the hot slag is recycled. There is not enough knowledge about how various process parameters affect the atomization and size distribution of the particles in order to apply the process in the industry.The objective of the project was to create an experimental and a numerical model of the dry granulation process with rotating disc to investigate how various process parameters affect the atomization and size distribution of the particles, and to develop an image analysis method to validate the numerical model against the experimental results.An experimental model of the dry granulation process with a rotating disc was created in laboratory scale and simplified. Water was used instead of blast furnace slag in the experiment. A numerical model was constructed in Ansys Fluent to relate to the experimental process. Two different multiphase models were applied in the numerical model; Mixture and Volume of fluid to calculate the speed and the size of the particles. The average error against the experimental model was 10.9% for particle velocity and 13.1% for drop size.An image analysis method was developed to analyze the droplet atomization. The image analysis software ImageJ was used to calculate the particle sizes for the experimental and numerical model, while PTVlab was used to analyze the velocity of the particles from the experimental model.The study contributed to a better understanding of atomization and size distribution of particles at the dry granulation process with rotating disc, and how these were affected by the process parameters of fluid flow and the rotational speed of the disc.
Place, publisher, year, edition, pages
2015. , 66 p.
Teknik, torrgranulering, masugnsslagg, cfd, bildanalys, experiment
IdentifiersURN: urn:nbn:se:ltu:diva-53859Local ID: adb1ff87-c7ad-4f27-b818-d43dd7d73aaeOAI: oai:DiVA.org:ltu-53859DiVA: diva2:1027236
Subject / course
Student thesis, at least 30 credits
Sustainable Energy Engineering, master's level
Validerat; 20150616 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved