TEMPERATURE AND THERMAL-STRESS EVALUATION IN COMPLEX-SHAPED BOILER COMPONENTS

A fast way of temperature and thermal stress evaluation in complex-sha ped pressurized elements is presented. Transient temperature and therm al stresses in the point of concentration were calculated using the di screte form of the Duhamel integral. The time changes of temperature a nd maximal stresses u((r) over right arrow, t) were calculated for uni tary step change of the fluid temperature using the Finite Element Met hod. The Duhamel integral was then approximated numerically and the te mperature and thermal stresses were then evaluated for arbitrary time changes of fluid temperature. Practical application of the presented m ethod was illustrated by determining the circumferential stresses on t he edge of the boiler drum-downcomer joint.