撞击式气流床气化炉压力波动的周期性分析  

Periodicity analysis of pressure fluctuations in the impinging entrained-flow gasifier

作　　者：牛苗任[1] 梁钦锋[1] 于广锁[1] 王辅臣[1] 于遵宏[1] 

机构地区：[1]华东理工大学洁净煤技术研究所,上海200237

出　　处：《化学工程》2007年第4期22-25,共4页Chemical Engineering(China)

基　　金：上海市启明星计划资助项目(03QF14013);教育部新世纪人才支持计划(NCET-05-0413);国家高技术研究发展863计划(2003AA521020);国家重点基础研究发展规划(973)资助项目(2004CB217703)

摘　　要：在双喷嘴对置气流床气化炉热模平台上,对炉内压力波动特性进行了试验研究。把小波变换和FFT相结合,验证了R/S分析方法是测量气化炉压力波动周期性的有力工具。采用R/S分析计算出Hurst指数,说明气流床气化炉内的压力波动具有分形特征,同时发现压力波动存在周期成分,从统计意义上计算出压力波动频率为0.067 Hz。用小波变换进行滤波后,再对低频信号进行FFT,得出主频约为0.053 Hz,二种方法结果吻合得比较好。用高速摄像仪对气化火焰拍照,并用“乘法串级过程”思想,解释了压力波动产生机理。On a laboratory-scale testing platform impinging entrained-flow gasifier with two-burner, the experimental study of pressure fluctuations in the gasifier was performed. By combining wavelet transform with FFT analysis, R/S analysis was verified to be a powerful tool for measuring the periodicity of pressure fluctuations. The pressure signals were calculated with R/S analysis and the corresponding Hurst exponent was obtained, which shows that the signals have the fractal characteristics; the periodic component is found in the pressure fluctuation signals; the calculated fluctuation frequency is 0. 067 Hz. After denoising with wavelet transform, the low frequency signals were analyzed with FFT and the domain frequency was obtained as 0. 053Hz. The two computational results match well. A high-speed video camera system was used to grab flame image, and the origin of pressure fluctuations was interpreted in terms of the cascade process.

关 键 词：气流床气化炉 压力波动 周期性分析 

分 类 号：TQ546[化学工程—煤化学工程]