高炉氧煤燃烧器中煤粉燃烧过程的数值模拟

Numerical Modeling of Pulverized Coal Combustion in an Oxygen Coal Combustor for Blast Furnace

本文采用颗粒相连续介质－轨道模型对同轴射流渐扩式高炉氧煤燃烧器内煤粉燃烧过程进行了数值模拟。数值模拟结果表明，同轴射流渐扩式氧煤燃烧器在适当的射流速度比条件下，可在氧煤枪出口后方诱导出回流区及低速区，有利于延长煤粉在直吹管内的停留时间，改善煤粉在热风管中加热、挥发和挥发份的着火条件，改善氧气和煤粉的混合，提高煤粉燃烧区的氧气浓度。

The numerical modeling of pulverized coal combustion in an oxygen coal combustor was made by using the continuum trajectory model. The predicted results show that the proposed combustor can prolong the coal particle residence time and enhance coal oxygen mixing. Predicted results indicate that smaller (10 μm) particles, preheated and devolatilized rapidly, may have volatile combustion in the combustor, while larger (40 μm and 70 μm) particles can only be preheated and no devolatilization and combustion of such particles will occur in the combustor.