变径组合提升管内压力脉动及其流型转变特性
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摘要
采用变径组合提升管冷模实验装置,在固/气比(Gs/(ρ_g·U_g))为0～37.60,通过实验对变径组合提升管内的压力脉动信号及其流型转变特性进行了研究。结果表明,随着固/气比(Gs/(ρ_g·U_g))的增加,变径组合提升管内依次出现气力输送(Gs/(ρ_g·U_g)为0～15.00)、快速流态化(Gs/(ρ_g·U_g)为15.00～27.00)、高密度循环流态化(Gs/(ρ_g·U_g)为27.00～37.60)3种流型。变径组合提升管内压力脉动主要由两部分组成:一部分是由于进料波动产生的全局性压力脉动,主频在0.30Hz左右;另一部分是由于局部气流扰动,气-固相互作用以及颗粒(团)和颗粒(团)之间的相互作用引起的局部压力脉动。气力输送流型下,局部压力脉动的频率主要集中在D5频段(1.56～3.13Hz),主要由局部气流扰动引起;快速流态化流型下,局部压力脉动的频率主要集中在D4频段(3.13～6.25Hz),主要由局部气体与颗粒(团)间的作用引起;高密度循环流态化流型下,局部压力脉动的频率主要集中在D5频段,主要由局部颗粒(团)与颗粒(团)间的作用引起。
With using an adjustable combined riser cold model experiment device and solid-gas ratio(Gs/(ρ_g·U_g))ranging from 0 to 37.60,characteristics of both pressure fluctuation and flow regime transition were studied.Study results suggested that there were three kinds of flow regime in the riser,i.e.,pneumatic conveying(Gs/(ρ_g·U_g)0-15.00),fast fluidization(Gs/(ρ_g·U_g)15.00-27.00),high-density circulating fluidization(Gs/(ρ_g·U_g)27.00-37.60).Pressure fluctuation in the adjustable combined riser is mainly composed of two parts:one is the global fluctuation caused by feed fluctuation,which is about 0.30 Hz at the main frequency;the other is local fluctuation caused by local air turbulence,gas solid interaction and clusters interaction.In the pneumatic conveying regime,the main frequency of local pressure fluctuation caused by the local air turbulence is concentrated in D5(1.56-3.13 Hz)frequency.In the fast fluidization regime,the main frequency of local pressure fluctuation caused by the interaction between the local gas and particles(clusters)is concentrated in D4(3.13-6.25 Hz)frequency.In the high-density circulating fluidization,the local pressure fluctuation caused by clusters interaction is concentrated in D5 frequency.
With using an adjustable combined riser cold model experiment device and solid-gas ratio(Gs/(ρ_g·U_g))ranging from 0 to 37.60,characteristics of both pressure fluctuation and flow regime transition were studied.Study results suggested that there were three kinds of flow regime in the riser,i.e.,pneumatic conveying(Gs/(ρ_g·U_g)0-15.00),fast fluidization(Gs/(ρ_g·U_g)15.00-27.00),high-density circulating fluidization(Gs/(ρ_g·U_g)27.00-37.60).Pressure fluctuation in the adjustable combined riser is mainly composed of two parts:one is the global fluctuation caused by feed fluctuation,which is about 0.30 Hz at the main frequency;the other is local fluctuation caused by local air turbulence,gas solid interaction and clusters interaction.In the pneumatic conveying regime,the main frequency of local pressure fluctuation caused by the local air turbulence is concentrated in D5(1.56-3.13 Hz)frequency.In the fast fluidization regime,the main frequency of local pressure fluctuation caused by the interaction between the local gas and particles(clusters)is concentrated in D4(3.13-6.25 Hz)frequency.In the high-density circulating fluidization,the local pressure fluctuation caused by clusters interaction is concentrated in D5 frequency.
引文
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[16]吴广恒,王德武,魏晨光,等.循环流化床回路颗粒过阀压差脉动特性及对提升管内压力脉动的影响[J].石油炼制与化工,2017,48(8):84-89.(WU Guangheng,WANG Dewu,WEI Chenguang,et al.Differential pressure fluctuation characteristics of particles flowing through valve in a circulating fluidized bed loop and effect on the pressure fluctuation in the riser[J].Petroleum Processing and Petrochemicals,2017,48(8):84-89.)
[2]谢朝钢,魏晓丽,龚剑洪,等.催化裂化反应机理研究进展及实践应用[J].石油学报(石油加工),2017,33(2):189-197.(XIE Chaogang,WEI Xiaoli,GONGJianhong,et al.Progress on chemistry of catalytic cracking reaction and its practice[J].Acta Petrolei Sinica(Petroleum Processing Section),2017,33(2):189-197.)
[3]王平,杨朝合,田学民.面向产品分布协调的两段提升管催化裂解多目标优化[J].化工学报,2017,68(3):941-946.(WANG Ping,YANG Chaohe,TIANXuemin.Multi-objective optimization of two-stage-riser catalytic pyrolysis for optimal trade-off in product distribution[J].CIESC Journal,2017,68(3):941-946.)
[4]GENG Qiang,ZHU Xiaolin,LIU Yuxiang,et al.Gassolid flow behavior and contact efficiency in a circulatingturbulent fluidized bed[J].Powder Technology,2013,245(8):134-145.
[5]GENG Qiang,ZHU Xiaolin,YANG Jie,et al.Flow regime identification in a novel circulating-turbulent fluidized bed[J].Chemical Engineering Journal,2014,244(10):493-504.
[6]韩超一,陈晓成,吴文龙,等.内构件对变径提升管内气固流动特性的影响[J].石油炼制与化工,2016,41(1):5-10.(HAN Chaoyi,CHEN Xiaocheng,WUWenlong,et al.Effect of internals on characteristics of gas-solids flow in a variable diameter riser reactor[J].Petroleum Processing and Petrochemicals,2016,41(1):5-10.)
[7]ZHU Haiyan,ZHU Jesse.Gas-solids flow structures in a novel circulating-turbulent fluidized bed[J].AIChEJournal,2008,54(5):1213-1223.
[8]ZHU Jesse.Circulating turbulent fluidization-A new fluidization regime or just a transitional phenomenon[J].Particuology,2010,8(6):640-644.
[9]QI Maozhan,ZHU Jesse,BARGHI Shahzad.Particle velocity and flux distribution in a high solids concentration circulating turbulent fluidized bed[J].Chemical Engineering Science,2012,84(52):437-448.
[10]魏晨光,王德武,吴广恒,等.变径组合提升管浓相区颗粒流动特性[J].石油学报(石油加工),2017,33(2):303-308.(WEI Chenguang,WANG Dewu,WUGuangheng,et al.The flow characteristics of dense phase in adjustable combined riser[J].Acta Petrolei Sinica(Petroleum Processing Section),2017,33(2):303-308.)
[11]伊鑫,曲爱华.基于Welch算法的经典功率谱估计的Matlab分析[J].现代电子技术,2010,33(3):7-9.(YI Xin,QU Aihua.Matlab simulation analysis of power spectrum estimation based on Welch method[J].Modern Electronics Technique,2010,33(3):7-9.)
[12]姜华伟,陈鸿伟,高建强,等.基于风帽压力波动的一次风表观气速对循环流化床气固流态化特征影响的研究[J].中国电机工程学报,2014,34(17):2784-2793.(JIANG Huawei,CHEN Hongwei,GAO Jianqiang,et al.Research on effects of primary air velocity on gassolid fluidization characteristics of circulating fluidized beds based on pressure fluctuations in wind caps[J].Proceedings of the CSEE,2014,34(17):2784-2793.)
[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,2001,108-110.
[14]GRACE J R,ISSANGYA A S,BAI D,et al.Situating the high-density circulating fluidized bed[J].AIChEJournal,1999,45(10):2108-2116.
[15]胡小康,刘小成,徐俊,等.循环流化床提升管内压力脉动特性[J].化工学报,2010,61(4):825-831.(HUXiaokang,LIU Xiaocheng,XU Jun,et al.Characteristics of pressure fluctuations in CFB riser[J].CIESC Journal,2010,61(4):825-831.)
[16]吴广恒,王德武,魏晨光,等.循环流化床回路颗粒过阀压差脉动特性及对提升管内压力脉动的影响[J].石油炼制与化工,2017,48(8):84-89.(WU Guangheng,WANG Dewu,WEI Chenguang,et al.Differential pressure fluctuation characteristics of particles flowing through valve in a circulating fluidized bed loop and effect on the pressure fluctuation in the riser[J].Petroleum Processing and Petrochemicals,2017,48(8):84-89.)