The article calculates the radiation heat on the base of partly imaginary plane model . The stove is divided into different parts along the directions of smoke flow. Setting the most complex process of radiation heat transfer within the furnace burner region of combustion as study object

the furnace energy balance equation is then established

the combustion within the one-dimensional temperature field

the quantity of heat absorption and the heat flux of the water-cooled walls are also solved. The result is very consistent with the data measured by using three-dimensional model. Adopting one-dimensional simplified model can make the results converged faster which also can quickly provide the required statistics of power plants.