外置式热交换器是循环流化床锅炉大型化过程中必然涉及的问题。设置外置式热交换器有众多优点，如有利于受热面布置，磨损低；负荷调节性能好，控制污染物排放；汽温调节性能好；燃料适应性好；传热性能好；耐腐蚀性好。国外几家公司设计的外置式热交换器各有特点。我国在这方面已落后，应急起直追。 External heat exchanger is the inevitable problems involved in the large-scale circulating fluidized bed boiler. Setting external heat exchanger has many advantages, such as favorable heating surface arrangement, low wear and tear, good load regulation performance, control of pollutant discharge, good regulation of steam temperature, good fuel adaptability, good heat transfer performance, good corrosion resistance . Several foreign companies design external heat exchangers have their own characteristics. My country is lagging behind in this regard and has to catch up in an emergency.