流化床风帽故障的声发射检测

针对气固流化床中风帽故障影响流化质量问题，本文提出一种能够快速精确地检测出风帽故障位置和类型的声发射检测方法；声发射技术是一种实时、在线、非侵入流场的声波检测方法，利用均匀安装在流化床分布板下方的声发射传感器进行定位测量；采集气固流化床内颗粒撞击分布板产生的声信号，对该信号进行多尺度小波包分解，找出特征频段，由各个测点声发射信号总能量对比可以直观反应风帽故障存在位置，而各尺度能量分率的变化能进行故障类型判断；这种实时测量方法能更早，更精确的对风帽破损情况进行准确的判断。

Detection of Gas-solid Fluidized Bed Hood Fault Based onAcoustic Emission Testing

Aiming at cap fault effect in gas-solid fluidized bed fluidization quality problem, this paper proposes a can quickly and accurately detect the cowl fault location and the type of acoustic emission testing methods; Acoustic emission technology is a kind of real-time, on-line, non-intrusive flow field of acoustic detection methods, using the uniform distribution installed in the fluidized bed plate at the bottom of the acoustic emission sensor positioning measurement; Collection and distribution of particle collision in the gas-solid fluidized bed plate produced by acoustic signal, the signal is multi-scale wavelet packet decomposition, find out the feature frequencies, each measuring point by acoustic emission signal total energy contrast can exist intuitive response cowl fault location, and changes in the rate of each scale energy points can judge fault type; The real-time measuring method can earlier and more accurate for accurate judgment cap damage.