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为开发先进的低阻力循环悬浮床烟气脱硫工艺及技术 ,建立了实验段截面积为 5 0 0 mm× 5 0 0 mm的悬浮床气固相流动的冷态实验装置。床内空气的表观速度可达到 3.5 m/ s。设计了两种底部射流进气结构 ,控制床内的颗粒浓度在适合于 PDA测量的范围内 (约 5 0 g/ m3)。用颗粒动态分析仪 (PDA)测量了悬浮床内气固两相流动的结构 ,确定了不同表观气速和不同进气结构条件下的两相流场的特点。实验结果表明 ,实验段内无论是颗粒相还是气相 ,都明显存在平流区、主流区和回流区三个区域 ,而且颗粒相和气相的速度分布很相似。还描述了床内的颗粒脉动速度变化情况及床内的物料堆积情况。实验结果对循环悬浮床反应器的结构优化设计有参考价值
In order to develop an advanced flue gas desulphurization technology and technology in a low-resistance circulating suspended bed, a cold experimental apparatus for the gas-solid flow in a suspended bed with an experimental section of 500 mm × 500 mm was established. The apparent velocity of the bed air can reach 3.5 m / s. Two bottom jet inlet structures were designed to control the particle concentration in the bed within a range suitable for PDA measurements (~ 50 g / m3). The structure of gas-solid two-phase flow in suspended bed was measured by particle dynamic analyzer (PDA), and the characteristics of two-phase flow field under different superficial gas velocities and different inlet structures were determined. The experimental results show that there are obviously three regions of advection zone, main flow zone and recirculation zone in the experimental zone, both in the particle phase and in the gas phase, and the velocity distributions of grain phase and gas phase are similar. It also describes the changes in particle velocity in the bed and the material build-up in the bed. The experimental results have reference value for the structural optimization design of the circulating suspended bed reactor