干熄炉风帽供风压力损失的数值研究

Numerical study of pressure drop factor in vent-cap of CDQ shaft

干法熄焦的核心技术是干熄炉内焦炭的冷却过程,而此过程是否能够顺利进行的关键之一是布风的好坏。干熄炉内的布风受很多因素的影响,如风帽的几何形状和安装的位置,环形烟道的几何形状等等。对实验干熄炉内的风帽供风采用CFX计算流体力学商业软件进行数值模拟,重点研究了三种风帽供风条件下的压力损失,并计算出了每种风帽的阻力系数;针对每一种风帽,考察了横向压砖和纵向压砖对供风的影响。研究结果表明:对各种风帽,压砖情况下的阻力系数大于不压砖的情况;椭圆风帽的阻力系数远远大于高风帽和低风帽的阻力系数;风帽出口局部地方存在负压倒吸现象。

The key technology of CDQ （Coke Dry Quenching） is the cooling process of coke in CDQ shaft, while the most important factor is the distributing wind. The wind distribution is influenced by many factors, such as the geometry of the vent-cap, the installing position of the vent-cap and the geometry of the annular flue, etc. The turbulent flow in vent-cap of CDQ experimental shaft was numerically simulated by using CFD （Computational Fluid Dynamics） software, CFX. The pressure drop of each outlet under three kinds of vent-cap was studied and the pressure drop factor was calculated. For a specified vent-cap, the influence by the transverse pressing brick and longitudinal pressing brick were reviewed. The results indicate that the pressure drop factor with pressing brick is larger than that without pressing brick for each vent-cap; the pressure drop factor of elliptic vent-cap is larger than the other two vent-caps; the local position of the vent-cap outlet exist the negative pressure phenomenon.