双循环流化床颗粒循环流率的冷态实验研究与预测
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摘要
在自行搭建的双循环流化床冷态实验系统上研究了鼓泡床静床层高度、颗粒平均粒径、鼓泡床流化风速、快速床总流化风速及一次风量比例等控制参数对颗粒循环流率的影响,提出了基于上述控制参数的颗粒循环流率计算关联式。结果表明:随着鼓泡床流化风速的增加,颗粒循环流率变化不明显;随着快速床中一次风量比例和总流化风速的增加,颗粒循环流率均增大,当一次风量比例和总流化风速达到一定值后,颗粒循环流率的增幅逐渐变缓;颗粒循环流率随着静床层高度的增加而增大,随颗粒平均粒径的增大而减小,且颗粒平均粒径的影响程度较大;所提出的关联式能够较好地预测颗粒循环流率。
Cold-state experimental tests were conducted on a self-built double-circulating fluidized bed to study the effects of following factors on the circulating flow rate of particles,such as the static bed height,average size of particles,wind speed in bubbling bed and fast bed as well as the air distribution ratio,etc.,following which an empirical correlation was proposed for above control parameters and the circulation flow rate.Results show that the circulating flow rate varies little with the increase of wind speed in the bubbling bed,which increases with the rise of primary air ratio and total fluidization wind speed in the fast bed,and when the primary air ratio and total fluidization wind speed get up to a certain value,the growth trend gradually slows down.The circulating flow rate increases with rising height of bubbling bed and with reducing average size of particles,with the latter one effecting more.In addition,the empirical correlation proposed can be used to predict the circulating flow rate of particles well.
Cold-state experimental tests were conducted on a self-built double-circulating fluidized bed to study the effects of following factors on the circulating flow rate of particles,such as the static bed height,average size of particles,wind speed in bubbling bed and fast bed as well as the air distribution ratio,etc.,following which an empirical correlation was proposed for above control parameters and the circulation flow rate.Results show that the circulating flow rate varies little with the increase of wind speed in the bubbling bed,which increases with the rise of primary air ratio and total fluidization wind speed in the fast bed,and when the primary air ratio and total fluidization wind speed get up to a certain value,the growth trend gradually slows down.The circulating flow rate increases with rising height of bubbling bed and with reducing average size of particles,with the latter one effecting more.In addition,the empirical correlation proposed can be used to predict the circulating flow rate of particles well.
引文
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[3]陈鸿伟,张志才,李忠猛,等.锥形布风板双循环流化床颗粒循环流率研究及预测[J].动力工程学报,2013,33(12):920-925.CHEN Hongwei,ZHANG Zhicai,LI Zhongmeng,et al.Study and prediction on solids circulation rate in dual circulating fluidized bed with cone air distributor[J].Journal of Chinese Society of Power Engineering,2013,33(12):920-925.
[4]CHU C Y,HWANG S J.Attrition and sulfation of calcium sorbent and solids circulation rate in an internally circulating fluidized bed[J].Powder Technology,2002,127:185-195.
[5]韩超一,吴文龙,陶蕾,等.双循环流化床提升管中气固流动特性及接触效率研究[J].石油炼制与化工,2016,47(3):16-24.HAN Chaoyi,WU Wenlong,TAO Lei,et al.Study on gas-solid flow characteristics and contact efficiency in dual-loop circulating fluidized bed riser[J].Petroleum Processing and Petrochemicals,2016,47(3):16-24.
[6]耿察民,钟文琪,邵应娟,等.双循环流化床颗粒分布特性的三维数值模拟[J].中国科学院大学学报,2016,33(2):258-264.GENG Chamin,ZHONG Wenqi,SHAO Yingjuan,et al.3Dcomputational simulation of solid distribution characteristics in dual circulating fluidized bed[J].Journal of University of Chinese Academy of Sciences,2016,33(2):258-264.
[7]陈鸿伟,刘焕志,李晓伟,等.双循环流化床颗粒循环流率试验与BP神经网络预测[J].中国电机工程学报,2010,33(32):25-29.CHEN Hongwei,LIU Huanzhi,LI Xiaowei,et al.Experimental research on solids circulation rate in a double fluidized bed and BP neural network prediction[J].Proceedings of the CSEE,2010,33(32):25-29.
[8]韩磊,于旷世,朱治平,等.双循环流化床冷态实验研究[J].锅炉技术,2011,42(1):26-30.HAN Lei,YU Kuangshi,ZHU Zhiping,et al.Cold experimental studies on dual circulating fluidized beds[J].Boiler Technology,2011,42(1):26-30.
[9]KAUSHAL P,PRLL T,HOFBAUER H.Model development and validation:co-combustion of residual char,gases and volatile fuels in the fast fluidized combustion chamber of a dual fluidized bed biomass gasifier[J].Fuel,2007,86(17/18):2687-2695.
[10]GENG Chaming,SHAO Yingjuan,ZHONG Wenqi,et al.Experiments on particles flow in a dual circulating fluidized bed with symmetrical structure[J].Powder Technology,2016,304:81-88.
[11]李佑楚,陈丙瑜,王凤鸣,等.快速流态化的流动[J].化工学报,1979,30(2):143-152.LI Youchu,CHEN Bingyu,WANG Fengming,et al.The dynamics of fast fluidization[J].CIESC Journal,1979,30(2):143-152.
[12]RYU H J,LIM N Y,BAE D H,et al.Minimum fluidization velocity and transition velocity to fast fluidization of oxygen carrier particle for chemical-looping combustor[J].Hwahak Konghak,2003,41(5):624-631.
[13]金涌,祝京旭,汪展文,等.流态化工程原理[M].北京:清华大学出版社,2001:25-63.
[14]杨士春,刘荣厚.流化床流态化质量影响因素[J].农业工程学报,2009,25(3):205-208.YANG Shichun,LIU Ronghou.Effect of influencing factors on fluidization quality of fluidized bed[J].Transactions of the CSAE,2009,25(3):205-208.
[15]SHIN H H,CHU C Y,HWANG S J.Solids circulation and attrition rates and gas bypassing in an internally circulating fluidized bed[J].Industrial&Engineering Chemistry Research,2003,42(23):5915-5923.
[16]韩磊.双循环流化床冷态实验研究[D].北京:中国科学院工程热物理研究所,2010:32-41.