无钟高炉炉料分布预测模型

为提高无钟高炉炉喉料面的预测精度,建立了考虑炉料运动的炉料分布数学模型.在分析炉料运动的基础上,指出了炉料运动是影响炉料堆积过程的重要因素,采用尺寸比1:10的无钟布料器模型试验分析了不同炉料分速度对炉料堆积行为的影响,建立了考虑炉料运动因素的料堆轮廓预测模型,并通过数值方法确定了料堆的位置和料面轮廓曲线,应用于料面形状的预测.结果表明:炉料的运动是造成料堆两侧堆积角差异、料堆横截面面积变化以及料面轮廓改变的重要原因,料堆轮廓采用直线段和曲线相结合的方式进行构造,炉料的堆积角和曲线过渡区域长度作为重要的模型参数均考虑了炉料速度的影响,模型构造的轮廓接近真实料堆形状,应用该模型实现了炉喉料面的准确预测.

Burden distribution prediction model in a blast furnace with bell-less top

In order to improve the accuracy of burden surface prediction in a blast furnace with bell-less top, a mathematical mod-el of burden distribution considering burden motion was established. Based on the analysis of burden motion in the furnace, the burden motion was pointed as an important factor affecting the burden formation, and a 1:10 dimension scale bell-less top distributor model was used to analyze the effect of different burden components' velocity on heap formation. Then a heap formation prediction model con-sidering burden motion was established, the numerical method was employed to determine the heap position and the heap shape, and at last the model was applied to predict the burden surface. Results show that the burden motion is the main reason causing the differ-ence between the heaping angles in both sides of the heap, the variations of area of the heap cross section and heap profile. The heap profile is constructed by lines and curves in the heap formation prediction model, and the important model parameters, including the heaping angles and the length of curved transition area, all take burden motion into account. Thus the profile constructed is close to the actual heap, and the accurate predicted burden surface is achieved after applying this model to burden distribution prediction.