Exhaust temperature is as the main controlled variable to regulate the steam valve opening coarsely; inlet air temperature is as the deputy variable to regulate the steam valve opening subtly, for fine-tuning of the steam valve opening. 其中以排风温度为主被控变量,进行蒸汽阀门开度粗调;进风温度为副被控变量,进行蒸汽阀门开度的辅助微调。