Based on detailed analysis of the traditional utility boiler tail heating surface and the layout scheme of the conventional low-temperature economizer,this paper proposes a new type of power plant boiler tail heating surface optimal layout program.Thereby,hierarchically arrange the air preheater,install the economizer and high-temperature air preheater in the separated flue,fix the two-staged air preheaters in the main flue and the low-temperature economizer between the two-staged air preheaters.In combination with a typical 1000MW unit power station boiler,the heat transfer characteristics and the energy-saving effect of the proposed method are analyzed.Results indicate that the hot air temperature can be increased by nearly 20℃,and the low-temperature economizer can save the extracted steam of the #5 regenerative heater from the steam turbine.The saving of standard coal equivalent (SCE) can reach at 4.6 g/(kW · h).The annual amount of coal savings can approximate 26,000 tons and 26 million RMB per year (with 5500hours unit running time).
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