基于取样-光脉动法的电站锅炉煤粉细度在线测量方法研究

On-line Fineness Measurements of Pulverized Coal in Boiler based on Sampling-Light Transmission Fluctuation Method

针对电站锅炉稳定浓度工况下煤粉粒径分布测量需求,设计了取样装置,对高浓度气固两相流颗粒进行取样,并稀释形成稀疏气固两相流,同时基于单一颗粒光脉动法粒径测量原理统计分析获得颗粒粒径及分布,将该方法应用于电站锅炉煤粉细度参数测量,实时获得煤粉细度R75、R90和R200等参数,并与筛分法进行对比,R75相对偏差为13.2%。此外,改变制粉系统运行工况,该方法能够快速获得细度变化情况,为电站锅炉运行优化调整提供重要数据支撑。

In order to solve the problem of particle size measurement under the high concentration stable condition and meet the requirement of particle size distribution measurements in power station boiler,a dilution and sampling device for the high particle concentration gas-solid two phase flow was designed.Based on the particle size measurement principle of single particle LTF method,the particle size and distribution were obtained.This method was used for the particle size measurement of pulverized coal in power station boilers,and the R75,R90 and R200 fineness parameters of pulverized coal could be obtained real time.Compared with the sieving method,the relative deviation of R75 was 13.2%.With the different operation condition of pulverizing system,the variation of particle size could be fast achieved.It provided important data support for the operation optimization and adjustment of power station boiler.