Stress Problems at the Steam Drum Fatigue Checking Point of a Supercharged Boiler

Abstract

On the basis of the proposed computing method for the low-cycle fatigue lifetime of a supercharged boiler steam drum, and the two computing principles, which super-pose the resultant stress of the internal pressure stress and the radial temperature difference heat stress at the boiler steam drum fatigue checking point, whose influences on the low-cycle fatigue lifetimes of one supercharged boiler steam drum were calculated, compared and analyzed, there out the computing principle of a supercharged boiler for superposing the resul-tant stress of the above-mentioned two stresses was opened out. The simplified computing method, which will be applied to calculating the alternating stress range in a stress cycle at the supercharged boiler steam drum fatigue checking point, was also derived from combining the design feature of a super-charged boiler steam drum with theory analysis, and com-paring with the Chinese Standard computing method, this computing method not only can reduce the calculational work-load, but also can simplify the calculational steps greatly. Thereby the proposed computing method for the low-cycle fatigue lifetime of a supercharged boiler steam drum was also further simplified.

Research on the Connection Type between Evaporating Tube Bundle and a Steam Drum Shell on a Natural Circulation Marine Supercharged Boiler

“…For the sake of simplifying this method and making it apply to marine and stationary boilers, Ref. [5,6] derived the shortcut method of alternating stress range. In the research on the crack propagation lifetime of supercharged boiler steam drums, Ref.…”

An On-Line Fatigue Life Monitoring System for Boiler Drums Based on the Inverse Problem of Heat Conduction Method

“…The operating condition of boiler drum directly attached to the safety of the entire power station, so assurance must be made available all along the total life cycle .It endures high thermal stress caused by uneven temperature distribution and mechanical stress due to the internal pressure during the start-up and shut-down processes. For this reason, many studies have been carried out on stress analysis, online stress monitoring and fatigue life analysis of boiler drums [1][2][3][4]. Several methods for optimizing the boiler start-up process have been proposed [5][6][7].…”