1 前言燃气炉是炼油厂中用于加热原油的重要装置。被加热原油的出口温度是最为人们关注的参数,温度过低,不能满足下一工序(如精溜、裂化等)的需要,危及产品质量和收率;温度过高,易造成炉内分解,结焦、烧环炉管等事故。因此,在自控中,出口温度总被选择为被调参数。影响这一被调参数的因素是很多的,诸如燃料气的压力波动, 1 Introduction Gas furnaces are important equipment used to heat crude oil in refineries. The outlet temperature of the heated crude oil is the most concerned parameter. The temperature is too low to meet the needs of the next process (such as refining, cracking, etc.), endanger product quality and yield; the temperature is too high, Coking, burning ring furnace tube and other accidents. Therefore, in the automatic control, the outlet temperature is always selected as the tune parameters. There are many factors that affect this parameter, such as the pressure fluctuation of fuel gas,