The reformation on the outlet crate in the superheater of the black liquor recovery boiler

The crater on the black liquor recovery boiler high temperature superheater outlet header nozzle stub designed by Wuhan BoilerGroup often cracks mainly due to the negligence on the compensation on the thermal expansion of the piping. The paper analyses the causesfor the cracks and finds out their causes from the perspective of thermodynamics, and a modification has been made onto the piping tructure.