Abstract: In order to further enhance the thermal efficiency of fired heaters and improve the scientific validity and rationality of waste heat recovery system design, this paper analyzes and studies the simulation calculation method for flue gas flow field of waste heat recovery system for fired heaters. Through boundary condition assumptions, calculation principles deduction, simulation calculation, and regression fitting based on on-site measured data, a technical route is summarized to form the simulation calculation method and flue design method for flue gas flow field in fired heaters. This provides a combined qualitative and quantitative analysis method for improving thermal efficiency and solving practical operation problems for fired heaters.

Key words: flue gas flow fieldlsimulation and calculationlflue gas designlqualitative analysislquantitative analysis