The paper presents the computer system for thermal load monitoring in thick-walled components of boilers during the boiler start-up and shut-down developed in the Institute of Power and Process Engineering of Cracow University of Technology. The system was manufactured and implemented by Control Process company specialised in industrialsignal processing. The presented system calculates and displays the following data: instant speed of temperature variations in the walls of the component, thermal stress inside the component wall caused by the temperature gradient over the wall thickness, thermal stress caused by the non-uniform temperature distribution over the drum circumference, stress caused by fluid pressure and the total hoop and longitudinal stress on the inner surface of the thick-walled component.
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