滚筒冷渣器传热模型的研究

Research of Heat Transfer Model in Rotary Ash Coolers

分析了携带翅片滚筒冷渣器内灰渣颗粒的流动过程和传热过程,提出了滚筒冷渣器一维轴向传热模型,模型中考虑了渣中未燃尽碳的残余燃烧,模型参数根据文献和实验室实验确定.利用该模型对一台300 MW循环流化床锅炉上滚筒冷渣器的温度进行了预测,并与实际运行参数进行了比较.结果表明:该模型可以很好地预测滚筒冷渣器出口灰渣的温度和冷却水温度.

By analyzing the flow and heat transfer process of ash particles in a rotary ash cooler with fins,a one-dimensional heat transfer model was proposed,in which the reburning of residual carbon in bottom ash was considered while the model parameters determined in accordance with relevant reference materials and experimental results.Using the model,temperatures of rotary ash cooler for a 300 MW circulating fluidized bed boiler were predicted,which were then compared with actual operation parameters.Comparison results prove the model to be accurate in predicting ash discharge and cooling water temperatures of rotary ash coolers.