Experimental study on temperature, heat flux, strain and stress distribution of boiler water walls

Abstract

To get some knowledge of the running state of the entire boiler water walls, an opposed wall firing furnace experimental system was put in place to investigate the temperature, heat flux, strain and stress distribution under two different combustion conditions. The results showed that the symmetry of combustion conditions had direct impact on temperature and heat flux distributions, while the influence on strain and stress distributions was more complicated. Areas that closed to flames present high temperature, while the high heat flux zone was mostly at the burner level (high flame temperature zone). For the strain and stress distribution of the heating surface, it was not only affected by the combustion condition (temperature distribution), but also the fixed constraints during the installation and debugging progress. Fixed constraints dominated the basic trend of the deformation, while temperature determined their detail magnitude and direction. Also, the deformation of the entire water wall system showed the character of integrality. For the first time, we gained systematic information of working states of the entire boiler water wall, especially the strain and stress distributions, which are of high value on the designation and optimization of the furnace heating surfaces.