The thermal-hydraulic calculation and analysis of the medium temperature platen superheater in a 300 MWe CFB boiler

The characteristics of outlet steam temperature and the metal temperature of the medium temperature platen superheater at different boiler loads was obtained in a 300 MWCFB boiler, the result shows that the imbalance rate of tube mass flux is determined by the structure of header and tube. Generally Z type arrangement is one of the reasonable types arrangement.

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► The wall temperature characteristics of the platen superheater was obtained.
► Platen superheater tube damage often occurs at around 75% BMCR boiler load.
► The mass flux deviation coefficient is determined by the header and tube structure.
► Z type arrangement of medium platen superheater is better than U type arrangement.