Compared with the conventional utility boiler

the ultra-supercritical double reheat boiler has different characteristics

like more complex heat load distribution in the furnace

higher working fluid temperature

lower heat absorbing capacity of water in the large specific heat region

and so on.It means the design of thermal hydrodynamic is more difficult in the vertically-upward water wall of ultra-supercritical double reheat boiler.Taking the ultra-supercritical 660 MW double reheat boiler in Anyuan Power Plant as an example

the thermal hydrodynamic performance of the vertically-upward water wall of ultra-supercritical double reheat boiler was analyzed in detail

according to the numerical simulation and hydrodynamic calculation.The distributions of mass flow rate

working fluid temperature and water wall temperature were obtained.The results show that

under BMCR working condition

there are obvious flow differences and water wall temperature differences in both the upper furnace and lower furnace.The fluid in water wall of both the upper furnace and lower furnace appears a minus mass flow characteristic.Therefore

the mass flow rate in the middle region is higher

while the distributions of working fluid temperature and water wall temperature are in the opposite.The results can provide guidance for hydrodynamic design and improvement of vertically-upward water wall in ultra-supercritical double reheat boilers.