基于CCD的高炉风口回旋区三维温度场的检测技术

在存在多介质的高炉回旋区内,首先利用安装在风口直吹管窥视孔的电荷耦合器件( charged couple device, CCD)摄像机可以获得高炉回旋区内累积的二维温度辐射图像,然后将高炉回旋区均分成若干小块,利用数学模型近似模拟回旋区内的辐射传热过程并建立矩阵方程,通过求解方程获得高炉回旋区内的三维温度场。在模拟辐射传热过程中,本文提出了一种更有效也更符合实际生产的新方法———基于距离的高斯函数模型来模拟高炉内介质的辐射能量传播过程并获得了较好的三维温度场。由于存在波动误差以及电荷耦合器件摄像机测量误差等,所以我们通过在测量数据中添加随机误差来验证重构温度场的有效性以及稳定性。结果显示重构的三维温度场与真实温度场非常接近,误差在高炉工业允许的5%范围以内。

A technique for measuring the three-dimensional temperature field of a blast furnace tuyere raceway based on CCD

In a blast furnace raceway with many mediums, two-dimensional temperature radiant images are obtained with a CCD camera installed in the blowpipe peephole. After the blast furnace raceway is divided into many small pieces, the radiation heat trans-fer process in the blast furnace raceway is simulated and a matrix equation is established by using a mathematical model. Then the three-dimensional temperature field of the blast furnace raceway is derived from solving the equation. In simulating the radiation heat transfer process, a new method, which is more effective and accordant with actual production, is introduced that a distance-based Gaussian function model is used to simulate radiation energy propagation in the blast furnace raceway, and thus a better three-dimensional temperature field is got by this method. Due to the existence of fluctuation error, CCD camera measurement error and so on, random error is added in the measurement data to demonstrate the effectiveness and stability of the reconstructed temperature field. The results show that the three-dimensional temperature field is very close to the actual temperature field, and the error is within 5%that is allowed in the blast furnace industry.