一种基于CO分析的加热炉燃烧控制技术

A furnace combustion control technology based upon CO analysis

炼油厂一般靠控制氧含量控制加热炉的燃烧过程,烟气中的氧含量用于控制过剩空气系数,希望燃料充分燃烧。但这种方法不够精确,由于加热炉(尤其是旧加热炉)普遍存在炉体漏风现象,氧含量的测量不能充分反映真实燃烧情况,而且在反应速度相对缓慢的情况下,往往会放慢控制策略的调整。因此有必要在燃烧控制中采用一个新的控制参数,用于反映燃烧是否完全,这个方法就是基于CO控制的燃烧优化技术,其优点是加热炉漏风对CO的测量没有影响。阐述了CO和过量空气的关系、技术原理以及基于CO分析的烟气控制原理和基于CO分析的控制加热炉燃烧的工艺过程。

In petroleum refineries,the control of O2 is generally used to control the combustion of furnace,and the O2 content in the flue gas is applied in controlling the excessive air coefficient for the complete combustion of fuel.This method is not accurate.As the air leaking is widely present in heating furnaces （especially the old furnaces）,the O2 content measurement can not reflect the actual condition of combustion.Under the slow reaction conditions,the adjustment of control strategy will be slowed down.Therefore,a new control parameter has to be applied in the combustion control to reflect whether the combustion is complete or not.This method is the CO-based combustion optimization technology,whose advantage is that there is no impact of leaking air of furnace on CO measurement.The relation between CO and excessive air,technical principles of CO-based flue gas control and CO-based furnace combustion control are described.