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首页> 外文会议>International congress on the science and technology of ironmaking >Effects of Tuyere Dimensions and Bosh Angle on Raceway Shape and Particle Movement Based on Cold-Model Experiments
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Effects of Tuyere Dimensions and Bosh Angle on Raceway Shape and Particle Movement Based on Cold-Model Experiments

机译：风口尺寸与朝向角度对基于冷模型实验的滚道形状与粒子运动的影响

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To curb CO2 gas emissions from steel plants, there is an urgent need to decrease the reducing agent ratio (RAR). Theoretically, other than the conversion of materials and reducing agent of blast furnace, the most important countermeasures are to increase the gas utilization efficiency (shaft efficiency) and to decrease the heat loss. To increase the gas utilization efficiency and to decrease the heat loss caused by the drop in gas velocity in the periphery, it is necessary to improve the gas permeability of the blast furnace, which depends mainly on the properties of the burden materials. In addition, optimizing the tuyere dimensions and bosh angle may improve the permeability in the lower part. A 1/10-scale cold-model with two tuyeres has been developed, based on which the effects of tuyere dimensions, such as nose length and nose angle, and bosh angle on the raceway were investigated by using particle image velocimetry (PIV) and an infrared thermo-viewer. Experimental results show that a long tuyere improves the circulation of particles in the raceway and the heat transfer of the deadman. Raceway depth does not change for tuyere angles between +20 and –20 degrees, but a downward tuyere improves the heat transfer in the deadman. Although a large bosh angle helps to smooth the descent of coke, it accelerates peripheral gas flow and increases heat loss.
机译：为了遏制从钢铁厂的二氧化碳气体的排放量，因此迫切需要降低还原材比（RAR）。理论上，高于材料的转化率和高炉的还原剂等，最重要的对策是提高气体利用率（轴效率）和以降低热损失。为了提高气体利用率和降低由于在外围中气体速度的下降的热损失，有必要改善高炉，这主要取决于负担材料的性质的气体渗透性。此外，优化风口尺寸和炉腹角可以提高在较低的部分的渗透性。具有两个鼓风口A 1/10-规模冷模型已经发展，在此基础上风口尺寸的影响，诸如鼻子长度和鼻角，并在滚道炉腹角，通过使用粒子图像测速仪（PIV）研究和红外热查看器。实验结果表明，长风口改善在滚道和故障自动刹车的传热颗粒的流通。滚道深度不为20幅-20度之间的角度风口改变，但向下风口改善了故障自动刹车的热传递。虽然大的炉腹角有助于平滑焦炭的下降，它加速周边气体流量和增加的热损失。

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