利用CCD测量炉膛温度场及NO_x排放特性试验研究

Experimental Study of the Measurement of Furnace Temperature Fields and NO_x Emission Characteristics with the Help of a Charge-coupled Device(CCD)

炉膛火焰中的局部高温是NOx排放量升高的重要原因,利用CCD摄像机对炉膛温度进行了测量,测温原理为双色法。在各种不同工况下,对锅炉负荷、过量空气系数、煤种、炉膛温度和燃烧器运行方式等因素同锅炉NOx排放特性之间的关系进行了实验研究。实验结果表明:随着各种影响因素的改变,炉膛温度相应发生变化,NOx排放亦表现为不同的变化规律。CCD能有效地实时监测炉膛温度,诊断局部高温,从而有助于改进燃烧,调节运行工况,有效降低NOx排放。

Local high temperature in a furnace flame is a major cause leading to an increase in NO_x emissions.Furnace temperatures were measured by using a charge-coupled device(CCD) based pick-up camera with the temperature measurement principle pertaining to a dual-color method.Under various operating conditions an experimental investigation was conducted of the relationship between such factors as boiler load,excess air factor,coal rank,furnace temperature,burner operating mode,etc on the one hand and NO_x emission characteristics on the other.The results of the investigation indicate that with the change in various influencing factors the furnace temperature will undergo corresponding changes and the NO_x emissions also follow different variation laws.The charge-coupled device can effectively monitor the furnace temperature on a real-time basis and diagnose local high temperatures,thus resulting in an improved combustion and a better regulation of operating conditions as well as an effective lessening of NO_x emissions.