Vol.21, No.3, 2021, pp. 266–272
UDC:

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