风口回旋区的数字图像处理方法

Raceway Definition Using Digital Image Processing Technology

风口回旋区对高炉及COREX熔化气化炉冶炼过程起着十分重要的作用,人们对风口回旋区进行了大量的试验与模拟研究。目前通过试验方法得到的风口回旋区仅仅是由若干个测量点确定。物理参数场可以用来准确确定回旋区边界,但是目前为止所有的研究风口回旋区的物理参数场都是由数值模拟确定,并且没有明确的回旋区的定义标准。在本研究中利用COREX熔化气化炉半周冷态模型,通过跟踪示踪颗粒的运动信息,得到观察面板处风口回旋区域的颗粒速度场。通过与目测结果的对比,确定超过0.15 m.s-1的颗粒速度标量场确定为风口回旋区域。通过本试验得到的回旋区边界可为回旋区的理论或数学模拟提供准确的边界条件。

The raceway has been studied extensively both experimentally and theoretically, but the raceway boundary in experiment is arbitrarily determinated by several measuring points. The whole physical parameters field can be used to describe the raceway boundary precisely, but all of the physical parameter fields are obtained from numerical simulation so far and there isntt a specific criterion used to define the raceway boundary. A new method was developed to define the raceway boundary in cold model of COREX melter gasifier, so as in blast furnace, granular drying, etc. The particle velocity contour criterion of raceway boundary definition was 0.15 m· s^-1 , and the precise raceway boundary can be obtained through this method. It is very important for the theoretical and mathematical modeling of the gas and solid flow and chemical reaction in and around the raceway region.