高速摄像技术在煤粉燃烧工作状态监控中的应用研究

Application of high speed video camera in pulverized coal combustion working state monitoring

针对高炉喷煤风口监控手段落后和回旋区耦合传热计算误差大、实时性差等问题,本文以高速摄像机作为测试工具,研究了喷煤高炉风口回旋区煤粉燃烧状态。用图像处理和三基色辐射测温法计算回旋区煤粉燃烧的温度变化和相对亮度变化,监控喷吹到高炉的煤粉粒子燃烧工况。并针对高速摄像机CCD传感器在高温测试过程中由于辐射强度过大易出现输出过饱和电流,导致"图像发白"问题,提出了摄像机快门控制模型,以提高摄像机测温动态范围,实现了风口回旋区温度和燃烧脉动的动态测量。通过现场应用表明,该方法为高炉喷煤提供了有力的测试手段和信息来源,快门控制模型提高了温度测量区间。

Aiming at the problem： lack of means in blast furnace injected pulverized coal monitoring measurement, large error and poor real time characteristic in couple heat transfer computation, the pulverized coal combustion state in raceway was studied using high speed video camera. In order to monitor the injected pulverized coal particle combustion working states, the flame temperature, image relative brightness and temperature field distribution of pulverized coal combustion flame are calculated using image processing and three-base color radiation temperature measurement method. The CCD shutter control model is provided to solve the CCD current super-saturation problem during high temperature measurement, which improves the dynamic temperature measurement range. The proposed method has realized the dynamic measurement of blast furnace raceway temperature and pulverized coal combustion pulse. The practical on-site test results show that the method is accurate and credible, offers an effective measurement method and information resource for blast furnace injected pulverized coal, and enlarges the temperature measurement range through avoiding image incandescence phenomena.