早在1958年,Hottel和Cohen提出了区域法,为灰壁面、充满真实气体封闭系统辐射换热问题,建立了完整的数学描述和计算方法;为锅炉燃烧室进行三维传热计算奠定了理论基础。在实际计算中,占计算机内存数太大,计算层次太多。对现代大型锅炉,将燃烧室粗糙地分为1000个区域(包括气体和壁面区域),此时占有计算机内存为1000K以上, As early as 1958, Hottel and Cohen proposed the regional law, which established a complete mathematical description and calculation method for the problem of radiation heat transfer in the closed system with gray walls and filled with real gas. This laid the theoretical foundation for the three-dimensional heat transfer calculation in the boiler combustion chamber . In the actual calculation, accounting for the number of computer memory is too large, too many levels of calculation. For modern large boilers, the combustion chamber is roughly divided into 1000 areas (including gas and wall area), at this time possession of computer memory for more than 1000K,