轧钢加热炉燃烧工况在线测控系统

Online Measurement and Control System of Combustion Conditionfor Rolling Reheating Furnace

摘要:

针对某大型钢厂轧钢加热炉系统在线实时性不强，采集数据不足，现场管理不便等问题，提出了构建加热炉燃烧工况在线测控系统。利用烟道气分析仪，在加热炉加热段增设多个燃烧气氛采集点，结合PLC和上位机组态软件，可以在线测量炉内不同区段残氧量与可燃物浓度，实现空气过剩系数的在线调整优化。同时，开发了节能量与氧化烧损两个模块，可用于实时估算可实现节能量与钢坯氧化烧损量。项目实施结果表明，炉燃烧工况在线测控系统可以实现加热炉内燃烧状况精确控制，有效降低燃气消耗。

Abstract:

Reasonable ratio of gas and air is a important measurement to ensure combustion efficiency for reheating furnace. The target of energy saving can be achieved by adjusting air-gas ratio according to combustion conditions. But for most of reheating furnace, only atmosphere in gas flue is detected, which is unable to reflect the combustion conditions in furnace. Rolling reheating furnace of a large-scale steel mill is transformed by adding online measurement and control system for atmosphere in reheating furnace, which can measure remaining oxygen and concentration of flue in different heating zones so as to realize online adjustment of excess air coefficient. At the same time, two modules of energy saving and loss of iron scale are developed which can be used for real-time estimation of energy saving and loss of iron scale. Operational result shows that online measurement and control system for combustion conditions can realize accurate control and reduction of gas consumption.