电厂煤粉细度在线监测系统研制与应用

Development and Application of In-line Measurement System for Pneumatically Conveyed Pulverized Coal Fineness in Power Plants

为了实现电厂燃煤锅炉输送管道内煤粉细度的在线监测,提出结合透射光强随机变化规律和光散射理论的光脉动气-固两相流颗粒粒径在线测量方法,研制多路固定式电厂锅炉煤粉细度在线监测系统,将该系统应用于通辽霍林河坑口发电厂600 MW机组中,对其28条煤粉输送管路中煤粉细度进行实时在线监测,并利用取样离线分析方法,对比该系统在线测量结果的平均值与取样离线分析结果。结果表明,该系统在线测量结果的平均值与取样离线分析结果的相对偏差不超过12%,验证了该系统在线测量的有效性。

To achieve the in-line measurement of pulverized coal fineness in coal pipes of power plants, the light fluctuation method combining the random variation of transmission light intensity and light scatting principles was presented for particle size measurement of gas-solid two phase flow, and the multi-probe and fixed in-line measurement system for coal fineness was developed. The system was applied to 600 MW power unit of Tongliao Huolirthe Pithead Power Company Limited. The pulverized coal fineness of 28 coal pipes was monitored in real time. The average results of in-line measuring results and off-line sampling results of this system were compared by the method of off-line sampling analysis. The results show that the relative deviation between the average results of in-line measuring results and off-line sampling results of this system is less than 12%, which indicates that this system has effectiveness for the fineness measurement of pneumatically conveyed pulverized coal.