摘要
引言
流化床在石油加工、结晶硅生产、烯烃气相聚合、矿物的热解与焙烧等工业生产过程中有着广泛的应用。在流化床中,颗粒的循环时间是描述流化质量的重要参数,其对气固两相之间的热量和质量传递速率有着重要影响[1]。目前,流化床内颗粒循环时间的检测可以采用示踪技术、高速摄影CCD技术、光导纤维和激光多普勒仪等方法[2-4],
The circulation time of particles is an important parameter describing the fluidization quality in fluidized bed.A new method for the measurement of circulation time of particles in fluidized bed based on the electromagnetic induction of the moving charges was proposed,and a detection model of electrostatic induction sensor was established.The experimental study showed that the relationship between the dominant frequency of electrostatic fluctuations and the circulation time of particles was Te=5.668/f0 at different superficial gas velocities between 0.12 m·s-1 and 0.48 m·s-1.The correlation coefficient between the experimental results and the model results was 0.9765,and the value of the root mean square error of prediction（RMSEP）was 0.0241.Thus,a simple,safe and precise method to determine the circulation time of particles applicable to the online measurement was presented.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2012年第5期1391-1397,共7页
CIESC Journal
基金
国家自然科学基金项目(21076180)~~
关键词
静电感应
气固流化床
颗粒循环时间
傅里叶变换
基频
electrostatic induction
gas-solids fluidized bed
circulation time of particles
Fourier transform
dominant frequency
