The paper presents stress-strain analysis of hot water fired tube boiler with
diversion chamber’s screened wall for start-up regime. Previous experiences of
hot water boilers indicate failures in operation and the occurrence of breakdown
which represent consequence of bringing the plant into the condition
characterized by parameters that are higher than allowed. The structure of hot
water boilers is exposed not only to high pressures but also to high
temperatures that are the reason that thermal stresses are dominant in those
boiler elements, especially with thick walls. High thermal stresses occur at the
highest temperature gradients and at transient operating modes. Experimental
results of measured temperatures of hot water boiler tube plate in the start-up
regime are presented, used as boundary conditions for numerical calculation.
Stress-strain analysis is performed by using FEM.
Keywords: hot water boiler, stress-strain analysis, numerical
analysis, experimental analysis, transient operating mode