●preheating the fuel by exchanging heat with fluegases (see 3.1.1). Note that the process can require air preheating when a high flame temperature is needed (glass, cement, etc.)

●或藉由熱交換利用煙道氣將燃料預熱(請見3.1.1節)， 要注意的是當火焰溫度需要很高的，製程(如玻璃，水泥製造)可能要將空氣預熱。
 

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Energy Efficiency (2009) 4.3.1