贴壁风对脱硫反应器内液滴粘壁的影响

反应器内液滴粘壁对半干法烟气脱硫效率和运行稳定性具有重要影响.本文采用数值方法研究了不同贴壁风风速和风口高度对反应器内液滴粘壁现象的影响规律.结果表明,贴壁风对减轻液滴粘壁具有一定作用.贴壁风风速越高,液滴贴壁数量越少.贴壁风衰减较快,其风口高度存在最佳值,贴壁风风口与液滴喷射口的高度距离是按照液滴直线运动粘壁时液滴高度行程的1.2倍.

EFFECT OF NEAR-WALL AIR CURTAIN ON THE WALL DEPOSITION OF DROPLETS IN SEMIDRY FLUE GAS DESULFURIZATION REACTOR

The wall deposition of droplets is an important issue for the desulfurization efficiency and operating stability in the semidry flue gas desulfurization(FGD)reactors.Various near-wall air velocities and near-wall air injection heights were analyzed numerically to investigate their effect on the gas-liquid flow and droplet deposition characteristics.The analytical results show that the near-wall air curtain effectively reduced the wall deposition of droplets in the semidry FGD reactor.The droplet deposition ratio decreased rapidly with increasing near-wall air velocity due to the enhanced near-wall air momentum.The near-wall air injection height had an optimum value due to the rapid decline of the near-wall air momentum along the reactor height.The optimum distance between the near-wall air and the droplet injection height was 1.2 times that of the droplet vertical movement distance according to the droplet linear movement.