炼钢烤包器温度控制系统开发与实现

Development and Implementation of Temperature Control System for Steel-making Ladle Heater

以炼钢烤包器为例,设计采用温度设定曲线控制方式,选用特定波长红外测温仪方式测量烤包器温度,由环形孔板测量混合煤气流量,采用气动或电动蝶阀的方式对混合煤气和助燃风流量进行调节。同时研发了炼钢烤包器空燃比和混合煤气热值的关系模型,对温度按热值变化的实际空燃比进行实时控制,使炼钢烤包器的温度控制处于全自动控制状态。实际应用表明:该控制系统可节约混合煤气40%～50%,提高钢包烘烤温度100～200℃。

Taking steel-making ladle heater as an example, the temperature setting curve-based control mode and the infrared thermometer with specific wavelength were selected to measure the temperature of steel-making ladle heater, including employing an annular orifice plate to measure mixed gas’ s flow rate and making use of pneumatic or electric butterfly valves to regulate flow of the mixed gas and combustion air;meanwhile, the relationship model between the air-fuel ratio of the ladle heater and the heating value of the mixed gas was developed so that the air-fuel ratio of temperature changing in light of the actual value of the heating value can be controlled automatically. The practical application shows that, this system can save 40% to 50% of the mixed gas and improve the ladle heater temperature of 100 to 200 ℃.