中国激光, 2014, 41 (1): 0108002, 网络出版: 2013-12-25
烟气流速及颗粒物浓度的光学测量方法研究
Study on Measurement of Flue Gas Velocity and Particulate Concentration by Optical Method
测量 光强起伏 互相关 烟气流速 颗粒物浓度 measurement light intensity fluctuation cross correlation flue gas velocity particulate concentration
摘要
为实现基于光学方法的烟气流速和颗粒物浓度的非介入式测量,研制了双光路对射式烟气流速测量系统,并在工业烟道上进行了实地测试。鉴于工业烟道内气流的复杂性和多变性,提出了一种反级串的烟气流发展模型,并改进了数据处理方法。分析结果表明:基于新数据处理方法测量的烟气流速,虽然其统计平均值与皮托管的单点测量结果存在0.7 m/s的差异,但两仪器测量结果的统计平均值非常一致,均接近7.6 m/s。当信号比较理想时,相对于经过简单滤波后计算得到的烟气流速,新的数据处理方法不会对烟气流速及其变化趋势造成明显改变。由烟气流速测量系统所测信号的光强起伏与颗粒物浓度存在明显的线型关系,相关系数可达0.97。
Abstract
In order to measure flue gas velocity and particulate concentration by optical non-intrusive method, a system is developed with double light paths structure, and is tested on industrial stack. The transmitting and collecting units locate at bilateral of the stack. The gas flow in stack is very complex and changes quickly, thus an inverse cascade model is proposed to describe the developing process of gas flow, and the data processing method for calculating flue gas velocity is improved. Analytical results indicate that, the difference of statistical mean value of flue gas velocities calculated by the new method and those measured by pitot tube at a single point is 0.7 m/s, which is larger than the expectation value, but the ensemble average velocities obtained by these two kinds of measurement are almost the same and are all about 7.6 m/s. When signals collected by our optical measuring system are perfect, the new method will not change the value of velocity and its trend is explicitly acquired after simple filter. There is clearly linear relationship between light intensity fluctuation measured by flue gas velocity measuring system and particulate concentration in stack measured by optical particle counter, and the correlation coefficient can reach 0.97.
倪志波, 董凤忠, 杨阳, 庞涛, 吴边, 张志荣, 曾宗泳. 烟气流速及颗粒物浓度的光学测量方法研究[J]. 中国激光, 2014, 41(1): 0108002. Ni Zhibo, Dong Fengzhong, Yang Yang, Pang Tao, Wu Bian, Zhang Zhirong, Zeng Zongyong. Study on Measurement of Flue Gas Velocity and Particulate Concentration by Optical Method[J]. Chinese Journal of Lasers, 2014, 41(1): 0108002.