Stress analysis and optimization of baffle plate in energy saving gas heater
To investigate the stress distribution and safety reliability of the baffle exposed to high temperature in heater,the stress of baffle was analyzed based on the finite element method.The dangerous section path was selected for the stress linearization analysis,and the structure of baffle was optimized according to the safety assessment results.The results show that the stress concentration caused by sharp angle has great influence on the stress distribution of baffle,and the excessive film stress of PL is the main reason of stress assessment risk.The overall stress of baffle is increased with the increasing of fuel inlet velocity,and the temperature is positively correlated with the thermal stress.The stress change trend is similar at different speeds,and the structure discontinuity at the connection of heat exchange tube bundle and folding plate can cause stress increase.In the optimization scheme,the maximum thermal stress of baffle is reduced by 16.7％when the sharp angle is passivated.The maximum thermal stress with thermal barrier coating is decreased by 44.5％as compared with that for passive tip angle,and decreased by 53.7％as compared with that for the original structure.The overall thermal stress is decreased,and the strength of the optimized baffle plate is assessed as qualified.
万方数据
维普
