<p style="text-align: justify;">The aim of this paper is to perform a dynamic analysis of a large industrial mixer used for mixing liquids inside a vertical tank. The analysis is performed numerically using software tools SolidWorks and Ansys for finite element method analysis. A comparative analysis of results obtained from both software platforms is presented. Although there are discrepancies in the results due to software differences, the overall results are satisfactory. The largest discrepancy was noticed in the maximum equivalent stress on<br />the tank roof. The structure exhibits elastic behavior under oscillating loading, keeping its integrity. While deficiencies in 3D modeling affect stress distribution, natural frequencies in software coincide with analytical calculations. Following loading, the structure settles as expected, indicating well-established dynamic analysis. Despite challenges in stress<br />localization, the study confirms the validity of the conducted analysis, considering the complexity of the structure.</p>

<p>The heating of residential and commercial premises in urban areas during winter periods is mostly performed by use of the heat energy which is distributed through central or city heating systems. Water, steam and gas are used as the basic working media in these heating systems. The thermal energy that is used in the city of Kakanj and its surrounding<br />settlements is produced in the Thermal Power Plant Kakanj and then delivered to the final consumers, which are usually located at relatively large distances from the heat source.<br />This paper describes the district heating system in Kakanj and the process<br />of heat energy distribution carried out by JP &bdquo;Grijanje&ldquo; d.o.o. Kakanj.<br /><br /></p>

<p style="text-align: justify;">As the result of combustion process in boilers of the Thermal Power Plant &bdquo;Kakanj&ldquo;, flue gases develop, which are undesirable for the environment, for people living in the plant neighborhood and for flora and fauna. In order to perform environmental protection a lot of efforts and organizational activities should be put in action and significant resources should be made available. Flue gases from the plant boilers are filtered and discharged in the environment after passing flue channels and the chimney. The Thermal Power Plant &bdquo;Kakanj&ldquo; has used 300-meter chimney for flue gases discharge for a long time. During the<br />overhaul of block 7 and reconstruction of 300-meter chimney in period September-December 2014, it was necessary to redirect the flue gases from blocks 5&amp;6 to the 100-meter chimney. This task required certain reconstruction of existing installation and calculation of 100-meter chimney capability. The performed flue channels reconstruction and calculation of operating parameters of 100-meter chimney are presented in this paper.</p>