基于数学模型的煤粉锅炉管束磨损预测与分析

Prediction and Analysis on Tube Bank Erosion of Pulverized Coal-fired Boilers Based on Mathematical Model

根据飞灰质量浓度与烟气速度的计算式建立了以易测取量为输入参数的磨损预测数学模型,通过测取预测模型的输入参数,对受热面的磨损量进行预测,并将其表示为过量空气系数与飞灰细度的函数.结果表明:过量空气系数和飞灰细度对磨损量影响显著;控制过量空气系数与煤粉细度,可以有效地降低磨损量;结合输入参数的在线测量,该模型亦可作为锅炉对流管束磨损的监测模型.

Based on formulas for calculation of fly ash mass concentration and flue gas velocity,a mathematical model for erosion prediction of heat surfaces was built up by taking quantities easy to get as input parameters.After acquisition of the input parameters,corresponding erosion prediction was then completed,of which the results were expressed in a function of excess air ratio and fly ash fineness.Results show that both the excess air ratio and fly ash fineness have an appreciable impact on erosion of boiler tubes,therefore controlling excess air ratio and fly ash fineness at an appropriate level can effectively reduce the erosive wear,and if combined with online measurement of input parameters,the model can also be used to monitor erosion condition of boiler convection tubes.