Based on the test results under different operating conditions

such as hot start-up

cold start-up

as well as hot and cold shutdowns etc.

the complex stress situation of boiler drum under diverse load conditions of media pressure

temperature

water gravity and proper gravity has been calculated and analysed in detail by using the finite element method to simulate the real-structure of boiler durm.Study shows that the boiler drum is mainly subjected to mechanical stress and thermal stress caused respectively by the media pressure and the three-dimensional temperature gradiant

and the mechanical stress is dominant.The most severe stress concentration due to the geometric discontinuous structure existed in the inner joint corner of drum shell and downtaking pipe head on the longitudinal cross section.In addition

the low-cycle fatigue life of boiler drum has been also analysed.