Modellbyggnad och simulering av Kiln styrning
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
The project which is presented in this report is focused on the positioning of the support rollers connected to the Kiln in one of the pelletizing plants in Kiruna at LKAB. Kiln is a rotating oven where the pellets are sintered, which is one of the steps in the pelletizing process. The support rollers are used to position Kiln in an axial or vertical direction, by either skewing the rollers or positioning the whole center of the rollers towards or away from the Kiln. The plan for this project is to be used as a preparatory work for a construction of an atomized system for adjustment of the support rollers for Kiln at LKAB in Kiruna. An atomized adjustment system can possibly simplify the procedure of Kiln positioning, increase the lifespan of the system and increase the reliability of the whole system.This report can also lead to improvements by being used as a support during positioning of support rollers. A support system for Kiln positioning can contribute to avoid production disturbances. Product disturbances can occur because of damaged components such as damaged support wheels or parts of the Kiln driveline. Less production disturbances increases the availability of the Grate-Kiln plant and thereby increases the profitability for LKAB. The aim of this project has been to develop a calculation model which can show the reactions of Kiln when the support rollers are adjusted. The assignment was also to include the heating and cooling of Kiln and to have considerations regarding the gear contact in the driveline. One part of the assignment was also to document the damages that can occur because of inaccurate positioning of the support rollers. The final step in this project was to propose optimized positions for the support rollers.This project is the final assignment before examination from the M.Sc Student in Mechanical Engineering program at the University of Technology in Luleå LTU in Sweden. The main part of this project has been to develop a calculation model. The calculation model is built in a Matlab script. In this Matlab script there are essentially six parts of the script that can be varied, and these parts are:- The temperatures in the system- The dimensions of components- The load, with or without pellets- The positioning of the pellets in the Kiln - The skewing of the support rollers- The positioning of the center of the support rollersWhen these parameters are varied a result for over 170 parameters can be collected. The calculation model is mainly focused on how the forces in the system reacts when the support rollers are adjusted and also how the Kiln reacts to thermal expansion and contraction. It is essentially the center positioning of the support rollers which is analyzed. The calculations of the forces which occur because of the skewing of the support rollers was too complicated and time consuming to be able to be finished during this project. The calculations regarding the skewing of the support rollers has been started and future work has been recommended.The calculation model, which is one of the results of this project has been used to analyze the reactions from positioning the support rollers. By examine how great the height differences are for the Kiln, a maximum center positioning of the support rollers has been recommended. This recommended maximum positioning is to protect any damages to the gear contact in the drive line. The thermal effects does not have a major impact on the forces in the system. Height differences that occur during heating and cooling of the Kiln has been noted up to about 9 mm. There is no great impact on the forces in the system during the interval which the support rollers can be adjusted without exceeding the maximum height differences. A validation of the results in this report is planned to be performed during the summer 2015.
Place, publisher, year, edition, pages
2015. , 68 p.
Teknik, Kiln, positionering, bärhjul
IdentifiersURN: urn:nbn:se:ltu:diva-58419Local ID: effc7986-1008-4022-8e6e-1e8f06d3f8a0OAI: oai:DiVA.org:ltu-58419DiVA: diva2:1031807
Subject / course
Student thesis, at least 30 credits
Mechanical Engineering, master's level
Validerat; 20150615 (global_studentproject_submitter)2016-10-042016-10-04Bibliographically approved