一种空燃比可调的蓄热式单烧嘴熔铝炉燃烧控制系统

An Air-Fuel Ratio Adjustable Combustion-Control System for Regenerative, Single Burner Aluminum-Melting Furnaces

传统的均压控制方式未利用燃料和空气的实际流量反馈控制空燃比,无法在燃烧全过程中保证较高的热效率。针对蓄热式单烧嘴熔铝炉,开发一种空燃比可调的蓄热式单烧嘴燃烧控制系统。该系统根据助燃空气电动阀门和天然气电动阀门出入口压力差计算空气和燃料的实际流量,实现熔铝炉空燃比的闭环控制,从而能更好地适应不同燃烧阶段熔铝炉燃烧特性的变化,达到节能降耗及提高熔铝品质的目的。

The traditional pressure-balance control does not use the flow feedback of fuel and air to control the air-fuel ratio,and therefore,high thermal efficiency cannot be achieved in the whole combustion process.In this paper,an air-fuel ratio adjustable combustion-control system is developed for regenerative,single burner aluminum-melting furnaces.The system calculates the actual flow of air and fuel according to the pressure differences between the inlets and outlets of the valves,so as to realize the precise closedloop control of the air-fuel ratio.The precise control of the air-fuel ratio can help to save energy,reduce consumption,and improve the quality of aluminum melting.