梯度温度分布下半焦/焦炭收缩规律的研究

利用炉侧安装了移动测量标尺的加热炉 (φ150mm×300mm)，分别以三种加热速率(1.0℃/min、1.5℃/min和3.0℃/min)及两种堆密度(880kg/m3和1080kg/m3)模拟工业炼焦，研究了1500g的炼焦用煤在焦化过程中径向收缩与焦化时间、中心温度、焦化升温速率及梯度温度的关系。结果表明，中心温度为280℃～360℃时煤柱开始收缩，900℃左右收缩结束，径向收缩值5mm～8.5mm，收缩率7%～12%；加热速率和堆密度增大，煤柱径向温度梯度增大，径向收缩值减小；加热速率增大，开始收缩时的中心温度降低，第二收缩高峰逐渐减弱，各梯度温度降低，煤柱收缩系数减小；堆密度大，开始收缩时的中心温度和各梯度温度均较高，对收缩系数及收缩高峰无明显影响。在焦化的不同时期，煤柱不同位置的升温速率不同。

Experimental study on shrinkage characteristics of semi-coke/coke under gradient temperature during coking process

A furnace equipped with a removable measuring scale in the side was applied to study on the shrinkage characteristics of semi coke/coke under gradient temperature during coking process. 1500g coking coal was used in the test. The effects of coking time, central temperature, heating up rate and gradient temperature on lateral shrinkage were studied under different heating rates (1.0℃/min, 1.5℃/min and 3.0℃/min) and densities (880kg/m3 and 1080kg/m3), respectively. The results show that the coal begins to shrink at a central temperature range of 280℃～360℃ and ends at about 900℃. The lateral shrinkage is in a range of 5mm～8.5mm and lateral shrinkage ratio is 7%~12%. Generally, the gradient temperature increases and lateral shrinkage decreases with increasing heating up rate and density. The central temperature of beginning shrinkage, the second shrinkage peak, gradient temperature of different locations and shrinkage coefficient of coal decreases with the increase of heating rate. The central temperature of beginning shrinkage and gradient temperature of different locations increase with increasing density. But the increase of density has no influence on shrinkage coefficient and shrinkage peak. In addition, the temperature rise rates at different locations are different during different coking stages.