一种撞击式烟气净化器气液传质特性的冷模研究
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摘要
本研究提出了一种撞击式烟气净化器。为了研究净化器喷淋-撞击区的气液传质特性,实验采用溶氧法、电导探针法分别考察了不同操作条件下喷淋-撞击区的体积传质系数、液含率。根据操作气液量和实验现象建立了喷淋-撞击区的负荷性能图,将操作区域划分为清液区、湍动-弹溅区、不稳定区。实验结果表明:操作区域位于湍动-弹溅区时,表观液速越大,液含率越高。当操作区域由清液区进入到湍动-弹溅区时,体积传质系数急剧增大,对压降、传质系数和操作稳定性等进行权衡可得,湍动-弹溅区为适宜的操作区域。撞击式净化器与无内构件喷淋塔相比,撞击式净化器可以显著提高传质效果。
A gas-liquid impinging flue-gas cleaner was proposed in the present work and a method of oxygen stripping-air desorption and a dual resistivity probe measurement system were employed to investigate the gas-liquid volumetric mass transfer coefficient and liquid drop holdup in the impacted spray area under different operating conditions.An impacted area load performance map relative to gas and liquid flow rates was established to identify the three typical operation patterns corresponding to the regions which were the clear liquid zone,the turbulent-splashing zone,and the unstable zone.The results showed that in the turbulent-splashing zone,liquid hold-up increased with the increase of superficial liquid velocity.When the operation pattern moved from the clear liquid zone to the turbulent-splashing zone,the volumetric mass transfer coefficient increased dramatically.Based on the comprehensive consideration of pressure drop,mass transfer coefficient and operation stability,the turbulent-splashing zone was believed to be the optimized operating zone.Impinging flue gas cleaner can improve mass transfer coefficient greatly compared with the cleaner without the inner conic plate.
A gas-liquid impinging flue-gas cleaner was proposed in the present work and a method of oxygen stripping-air desorption and a dual resistivity probe measurement system were employed to investigate the gas-liquid volumetric mass transfer coefficient and liquid drop holdup in the impacted spray area under different operating conditions.An impacted area load performance map relative to gas and liquid flow rates was established to identify the three typical operation patterns corresponding to the regions which were the clear liquid zone,the turbulent-splashing zone,and the unstable zone.The results showed that in the turbulent-splashing zone,liquid hold-up increased with the increase of superficial liquid velocity.When the operation pattern moved from the clear liquid zone to the turbulent-splashing zone,the volumetric mass transfer coefficient increased dramatically.Based on the comprehensive consideration of pressure drop,mass transfer coefficient and operation stability,the turbulent-splashing zone was believed to be the optimized operating zone.Impinging flue gas cleaner can improve mass transfer coefficient greatly compared with the cleaner without the inner conic plate.
引文
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[2]李喜,李俊.烟气脱硫技术研究进展[J].化学工业与工程,2006,23(4):351-355.Li Xi,Li Jun.Progress in Flue Gas Desulfurization Technology[J].Chemiacal Industry and Engineering,2006,23(4):351-355
[3]Takeshita M,Soud H.FGD performance and experience on coal-fired plants[M].London:IEA Coal Research,1993:20-35.
[4]郭东明.脱硫工程技术与设备[M].第2版.北京:化学工业出版社,2012:254-266.
[5]余海龙.基于新型液包气喷嘴的湿法烟气脱硫喷淋塔结构优化研究[D].广州:华南理工大学,2013.
[6]Hirofumi K,Takanori N,Masanori M,et al.New wet FGD process using granular limestone[J].Industrial&Engineering Chemistry Research,2002,41(12):3028-3036.
[7]Yi Z,Xiang G,Wang H,et al.A model for performance optimization of wet flue gas desulfurization systems of power plants[J].Fuel Processing Technology,2008,89(11):1025-1032.
[8]Strock T W,Gohara W F.Experimental approach and techniques for the evaluation of wet flue gas desulfurization scrubber fluid mechanics[J].Chemical Engineering Science,1994,49(24A):4667-4679.
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[10]陈湘文.筛板式喷淋塔脱硫脱硝性能试验研究[D].浙江:浙江大学,2008
[11]钱海平.筛板参数对筛板式喷淋塔脱硫性能影响的实验研究[J].能源与环境,2011,(1):49-51.Qian Haiping.Experimental study on influence of sieve tray parameters on desulfurization performance of spray scrubber with sieve tray[J].Energy and Environmental,2011,(1):49-51.
[12]Liu M X,Lu C X,Shi M X,et al.Region-dependent mass transfer behavior in a forced circulation airlift loop reactor[J].Powder Technology,2010,201(1):93-103.
[13]刘梦溪.水合物用气-液-固三相复合反应器的开发[D].北京:中国石油大学(北京),2005.