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本文对金属对流换热器材质的进步，换热器系统控制方式中的新技术，以及设计中确定空气预热温度时应考虑的问题等进行了论述。
In this paper, the progress of the metal convection heat exchanger material, the new technology in the control system of the heat exchanger and the problems to be considered when determining the air preheating temperature in the design are discussed.