风水共冷流化移动叠置式冷渣器的试验与开发

Development of a fluidizing-moving-bed ash cooler using air and water

全风冷流化移动叠置式冷渣器对于热渣量特别大的情况下 ,冷却风量不足以将热渣冷却至要求的温度或无法全部用冷风来冷却热渣 ,采用风、水共同冷却热渣的方式就成为一种有效的方法 .在试验研究冷渣器流化床中带有埋管的流动、混合和传热特性的基础上 ,开发出带有水冷受热面的风、水共冷式流化移动叠置式冷渣器 ,并设计、制造了冷渣量为 7.2 t/ h的风、水共冷式流化移动叠置式冷渣器 ,经调试后投入运行 ,通过 16 8h连续运行 。

A (patented) fluidizing moving bed ash cooler operated smoothly at low air to ash ratio. but had difficulty in cooling the drained ash to a desired temperature in case of large amount of ash. A fluidizing moving bed ash cooler using air and water together was designed raised to solve the problem. To design the ash cooler, the hydrodynamics and heat transfer of immersed tubes in a fluidized bed of the cooler were investigated experimentally. The investigation included measuring the minimum fluidizing velocities at different pitches of immersed tubes, tracing moving particles in the bed and metering the heat transfer coefficients of the immersed tubes. Based on the experimental results, an industrial ash cooler was designed, manufactured and installed. It can of cooling 7.2 ton's ash per hour from 950 ℃ to 200℃ .