煤质变化对钢球磨煤机贮仓式热风送粉制粉系统的影响

以华北某电厂的燃煤锅炉及制粉系统为研究对象,基于锅炉和制粉系统的热力计算及现场实际测量数据,定量分析了煤质变化与粗粉分离器后煤粉细度、煤粉水分、磨煤机最佳通风量、磨煤出力、出力储备系数、单位磨煤电耗、露点温度和三次风率的关系,并在此基础上确定了合适的煤种,提出了相应的改造措施.分析表明：对制粉系统运行安全性、磨煤出力和经济性影响最大的煤质因素是可磨性指数和原煤水分.计算结果与实际运行测量基本吻合,采用的计算与分析方法对普遍存在的同类问题具有参考价值.表9参6

Operational Effect of Changes of Coal Quality on Pulverized Coal Storage Systems with Ball Mills and Hot Entraining Air

Coal firing boilers and pulverizing systems of a certain power plant in North China is taken as the object of investigation.Based on thermodynamic calculations and actually measured data,the effect of coal quality on the granularity of coal leaving the coarse separator,the coal powder's moisture content,the mill's optimal ventilation flow rate,the milling output,the capacity reservation factor,the mill's specific power consumption,the dew point and the tertiary air feeding rate are being quantitatively analyzed;whereon the suitable coal category is ascertained and corresponding measures of reconstruction recommended.The analysis indicates that the most important coal quality factor,that effects the pulverizing system's operational safety,the mill's output and its operational economy is the coal's grindability index.Calculation results basically agree with measurements obtained during operation.The calculation and analyzing methods used may serve as a reference for similar jobs.Tables 9 and refs 6.