To study the thermodynamic and security characteristics of the super heater in supercritical oncethrough boilers during peak adjustment process

this paper establishes a model for a supercritical 600 MW once-through boiler and carries out the numerical simulation

by using the MATLAB/Simulink platform.The dynamic characteristics of heat absorption of the super heater were studied under conditions with BMCR of 35%to 100%.The results show that

with an increase in the boiler load

the flue gas temperature at the furnace outlet and the screen-type super-heater outlet

and the steam temperature at the convective superheater outlet increased steadily

while the flue gas temperature at the convective superheater outlet tended to be stable.The convection heat absorption of the convection super-heater was on fastest-growing

while the radiation heat absorption of the convection super-heater was in a relatively minimum value.The convection heat absorption was greater than the radiation heat absorption in additional heating surface

and the heat absorption of the water wall was greater than that of the roof super-heater.Compared with the additional heating surface of screen-type super-heater

the convection heat absorption of the additional heating surface of the convection super-heater was much higher than the radiation heat absorption.