Abstract:

In slashing running conditions, the bulging deformation of coke drums may appear after some years. In order to avoid the deformation, this paper analyzes the deformation mechanism of coke drums, and uses the bending theory of cylindrical shell to reveal the internal force and the displacement of the coke drum body suffering from temperature stress and inner compressive force. According to the Mises yield rule, it is found that, as part of the drum body yields during the process of temperature decreasing, a periodical plastic residual deformation occurs and increases with the running cycles of coke drums. It is thus concluded that the bulging deformation of coke drums mainly results from the progressive plastic deformation.

Key words: coke drum, progressive plastic deformation, bulging deformation, cylindrical shell