In view of the characteristics of heating surface layout and staged combustion of large-scale ultra-super critical pulverized coal boiler

based on the divisional calculation method in the Soviet Union's 1973 boiler unit thermal calculation standard

an improved partition calculation method is proposed and a new one-dimensional furnace heat transfer model is established. In this model

the furnace is divided into five sections from the bottom of the cold ash hopper to the furnace arch

and the energy balance equation of each section is established. By using the gradual approximation method to calculate with C language programming

the temperature distribution along the height of the furnace and the heat load of the water wall can be obtained. Taking a 600 MW supercritical pulverized coal boiler as an example

the furnace heat transfer calculation is carried out. The deviation of the furnace outlet temperature from the design value obtained by the improved partition calculation method under the three typical working conditions is less than the error calculated by the zero-dimensional model. The improved partition method has smaller errors. The model meets the requirements of engineering applications and can provide a reference for the calculation of heat transfer in the furnace of an ultra-super boiler.