防堵防跑双罩式内循环流态化水冷器研究

冷冻系统立式水冷器多,流速很低,水垢比较严重,效率差.本文研究的防堵防跑双罩式内循环流态化水冷器的结构特点是:底室采用泡罩板加大孔均布板取代筛孔容易堵塞的筛板;水冷管出口安装挡粒调匀罩.结构优化试验表明:采用直径120 mm的泡罩、流态化粒子层厚度170 mm以上、孔径8 mm的均布板、高度30 mm的挡粒调匀罩,能够有效地防止出口室跑失流态化清洗粒子,各水冷管内的流速分布与粒子浓度的均匀性较好,可以满足稳定运行的可靠性要求.在一般水冷器流速范围内冷却强化幅度60%以上,加上在线自动清洗效果好,节水节能的综合效益相当高.

Research on Water Cooling Condensers of Internal Circulating Fluidized-bed without Being Blocked or Particles Fleeing

The number of water cooling condensers is large,but their operation efficiency is very low because of low flowing velocity of water and serious fouling.Based on this,a new condenser is developed,in which fluidized-bed circulates without being blocked or particles fleeing.Its structure is characterized by the fact that the sieve plate is replaced by a bubble cap plate and a plate of large holes to make water distribute better;a special shroud.is mounted at the tubes outlet to prevent solid particles flowing away,from which only water flows.The optimal diameter of the bubble cap is 120mm and the diameter of the holes in another plate is 8mm.The experiments show that the optimized condenser is much more effective when the particles layer is more than 170mm deep,e.g.water distribution is uniform in each condensing tubes to meet the demands of stable operation and particles are prevented from flowing outs of the equipment.The new technology not only makes equipment form fouling attached but also enhances heat transfer greatly by amore than 60%.The comprehensive result of saving water and energy is good.