The circulating fluidized reactor is applied widely in desulfurization and denitriding due to high gas?solid contact efficiency. And in order to enhance the effect of mass transfer in solid?gas phase, an internal was installed in the cold circulating fluidized bed (CFB) platform, and the pressure character under different conditions was studied. To investigate the characteristics of pressure fluctuations in circulating fluidized bed, the dynamic pressure of gas solid two-phase flow in circulating fluidized bed riser were systematically measured with quartz sand in it by the dynamic pressure sensors. The results showed that when a complex internal was installed in the CFB, the line of system pressure distribution matches the theory of the pressure balance and presents a shape of "8". The main bed drop includes the inlet pressure drop, the venturi pressure drop, the riser pressure drop and the outlet pressure drop. The venturi pressure drops occupied the major part with a percentage of exceeding 60%. The superficial gas velocity and the particle circulating flow rate affected the main bed pressure drop simultaneously. The inlet pressure drop increased with the increase of the superficial gas velocity, while hardly being affected by the particle circulating flow rate. The venturi pressure drop changed similarly with the main bed pressure drop. The outlet pressure drop increasesd slightly with the increase of the superficial gas velocity, while hardly being affected by the particle circulating flow rate. The power spectrum analysis of the transient pressure of the circulating fluidized bed showed that the pressure fluctuation had a corresponding dominant frequency which had the corresponding size of vibrational energy. The smaller the superficial gas velocity was, the larger the particle circulating flow rate was, and the pressure fluctuation would be bigger. The system pressure drop increased with the increase of the height of the particle in the pipe. And the component could increase the pressure in the circulating fluidized bed and also reduced the non-uniform degree of the pressure while optimizing the flowing field.
Wenqing XU Xuejing HUANG Jun XIE Tingyu ZHU?
. Characteristics of dynamic pressure in circulating fluidized bed with internals[J]. The Chinese Journal of Process Engineering, 2018
, 18(6)
: 1267
-1275
.
DOI: 10.12034/j.issn.1009-606X.218116
[1]高金龙.半干法脱硫系统反应器内固体颗粒浓度分布的测量与优化:(硕士学位论文).杭州:浙江大学, 2013.
[2]汪军盛，叶猛，朱廷钰，等.循环流化床脱硫反应器流场特性实验研究[J].贵州大学学报：自然科学版, 2014, 31(2):129-135
[3]周月桂，彭军，朱贤，等.循环流化床烟气脱硫气固两相流动特性的实验研究[J].动力工程, 2009, 29(6):559-564
[4]Zhou Y, Peng J, Zhu X, et al.Hydrodynamics of Gas–solid Flow in the Circulating Fluidized Bed Reactor for Dry Flue Gas Desulfurization[J].Powder Technology, 2011, 205(1):208-216
[5]Wang C, Lu Z, Li D.Experimental Study of the Effect of Internals on Optimizing Gas–solid Flow in a Circulating Fluidized Bed[J].Powder Technology, 2008, 184(3):267-274
[6]Zhu H, Zhu J.Characterization of fluidization behavior in the bottom region of CFB risers[J].Chemical Engineering Journal, 2008, 141(3):169-179
[7]李少华, 张庆喆, 王虎，等.内构件对-塔内固体颗粒径向运动特性影响实验研究[J].锅炉技术, 2014, 45(02):30-34
[8]严枭, 王子健, 卢春喜.环隙下料式流化床-提升管耦合反应器的内截面压力特性[J].过程工程学报, 2016, 16(06):909-914
[9] 倪长春, 金文成, 郑帅, ，等.基于塔内构件优化的脱硫除尘一体化技术研究 .[J].机械工业标准化与质量, 2017, (9):39-42
[10]高建民, 秦裕琨, 高继慧，等.循环流化床脱硫塔内流场及气固分离特性数值模拟[J].热能动力工程, 2006, 21(5):487-490
[11] 张锡梅.循环流化床内结构布置对气固流动特性影响的试验研究:(硕士学位论文).杭州:浙江大学, 2010．
[12] 朱廷钰，何京东，荆鹏飞.一种用于循环流化床反应器中的扰流型复合构件: 101293189A[P]. 2008-10-29.6
[13] 汪军盛.循环流化床反应器气固流动特性及脱硫脱硝实验研究:(硕士学位论文).贵阳:贵州大学, 2014.
[14] 张伟.循环流化床锅炉床内流动特性研究:(硕士学位论文).河北:华北电力大学, 2010.
[15] 周发戚, 陈勇, 魏志刚，等.循环流化床提升管T形弯头动态压力的小波分析[J]. [J].化工学报., 2015, 66((5)):1697-1703
[16]刘宝勇，魏绪玲，郭庆杰，等.循环流化床提升管压力瞬时波动的功率谱分析[J].应用化工, 2012, 41(5):752-760
[17]曹晓阳, 周发戚, 陈勇，等.循环流化床颗粒输送斜管的压力脉动特性[J].石油学报石油加工, 2016, 32(05):913-920
