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在内径82mm,高1500mm的不锈钢流化床中,采用4种不同粒径加压流化床灰为实验物料,通过统计分析,功率谱分析和小波分析研究了流化床操作温度由室温至1000℃变化时压力波动行为。研究显示,灰在不同温度下随着流化数增加压力波动偏差增大。B类颗粒,流化数相同时,床层温度升高,压力波动标准偏差减小不明显。D类灰,当流化数相同时,床层温度升高使得压力波动标准偏差减小。在同样的温度下,随着流化数的增加,主频减小。高温鼓泡流化床压力波动信号包含低频成份和高频成份,高频成份较小。压力信号通过离散小波变换可分解为5尺度的近似信号和1到5尺度的细节信号,5尺度细节信号图上幅值大于平均幅值的尖峰数代表了气泡生成数。
In a stainless steel fluidized bed with an inner diameter of 82mm and a height of 1500mm, four kinds of pressurized fluidized bed ash were used as experimental materials. The effects of operating temperature of the fluidized bed from room temperature to 1000 were studied by statistical analysis, power spectrum analysis and wavelet analysis. ℃ pressure fluctuation behavior. The research shows that the deviation of pressure fluctuation increases with the increase of fluidization number of ash at different temperatures. B class particles, the same number of fluidized bed temperature increases, the standard deviation of pressure fluctuations is not obvious. D class ash, when the number of fluidized bed temperature increases so that the pressure fluctuation standard deviation decreases. At the same temperature, with the increase of the number of fluidization, the main frequency decreases. High-temperature bubbling fluidized bed pressure fluctuation signal contains low-frequency components and high-frequency components, high-frequency components smaller. The discrete wavelet transform decomposes the pressure signal into 5-scale approximation signals and 1-to-5-scale detail signals. The number of spikes with amplitude greater than the average amplitude on the 5-scale detail signal map represents the number of bubbles generated.