This provision applies to the heat transfer calculations of commonly used chemical industrial furnaces such as tubular heating furnaces, cracking furnaces, and hydrocarbon reforming furnaces that use gas, liquid, and solid fuels.
HG/T 20525-2006 history
2006HG/T 20525-2006 Design specification on heat transfer calculation of tubular furnace in chemical industry
1992HG/T 20525-1992 Design rules for heat transfer calculation of tube furnaces in chemical industry