气-固加压流化床压力脉动信号的分析  

Analysis of pressure fluctuation signals in a pressured fluidized bed

作　　者：刘明辉[1] 丁忠伟[1] 张同旺[2] 侯栓弟[2] 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]中国石化石油化工科学研究院,北京100083

出　　处：《计算机与应用化学》2011年第10期1281-1284,共4页Computers and Applied Chemistry

基　　金：中石化S-ZORB吸附剂加压流态化特性研究(S109016)

摘　　要：对气-固流化床特别是气-固加压流化床压力脉动信号进行深入分析有助于更好地了解该类反应器内的流动行为。为了研究压力脉动信号与加压气-固流化床内流动行为的关系,以FCC催化剂为实验物料,采用密相段内径300 mm、高度3800 mm、扩大段内径600mm、高度800mm的加压流化床,对其压力脉动信号进行快速傅里叶变换(FFT)和小波分析,获得了代表气泡行为的特征频率(D5-D7);分析此频段能量特征值随表观气速的变化规律,得出了流型转变速度u_c,并考察压力对u_c的影响。结果表明:压力波动能量集中在低频,随着气速的增加能量特征值先增加后减小,压力升高u_c减小。It is helpfull to find out the flow behavior in the reactor by deep analysis of the pressure fluctuation for the gas-solid fluidized bed especially the gas-solid pressurized fluidized bed. In order to investigate the relationship between the pressure fluctuation and the flow behavior in the pressured gas-solid fluidized bed, experiments were conducted in pressurized fluidized bed of 300 mm-i.d.x3800 mm in high（with an expanded top section of 600 mm-i.d.x800 mm in high） with FCC materials. The FFT and wavelet decomposition of pressure fluctuation was adopted to investigate the pressure fluctuation signals of the pressured fluidized bed. The frequency of bubbles was obtained（D6,D7）. According to the law of the energy distribution variated with superficial gas velocity, uc was obtained. Experiments show that： the energy of the pressure fluctuations was concentrated in the range of low-frequency. Along with the increase of gas velocity the energy values first increased, then decreased, and uc decreased as pressure increased.

关 键 词：加压流化床 压力波动 流型转变 功率谱 小波分析 

分 类 号：TQ015.9[化学工程] TP391.9[自动化与计算机技术—计算机应用技术]