三相内循环生物流化床内循环时间的研究

采用脉冲示踪法测定了三相内循环生物流化床反应器在不同进气量Q_g、固含率ε_s和升降流区截面积比条件下的循环时间T_C，对反应器的内循环特征和混合情况进行了系统的研究。结果表明：进气量Q_g、固含率ε_s和升降流区截面积比A_r/A_d共同影响了反应器的内循环时间T_C，进气量能在较大范围内调控反应器的循环时间T_C。循环时间T_C随进气量Q_g呈指数衰减，随ε_s的增加而增大，并且最小进气量Q_g,min也随ε_s的增加而升高；随A_r/A_d的增大，T_C总体也呈增大趋势。Q_g为96 L/h时T_C 随ε_s变化的转折点，当Q_g大于96 L/h时，T_C随ε_s的增加显著增大；并进一步讨论了进气量和固含率对反应器的生物处理效率和效果的影响，为反应器的改进、放大和运行提供了可靠的依据。

Internal Circle Time of a Three-Phase Inner-Loop Biological Fluidized Bed

The pulse tracing technique is used to determine the characteristics of the three-phase inner-loop biological fluidized bed.The internal liquid circulation is analyzed and the effects of the operating conditions,such as air flow rate Qg,solid content εs,and the cross-section area ratio of riser to downcomer Ar/Ad,on circle time TC are studied.Results show that with other operating conditions keeping constant,TC is affected significantly by the operating Qg,εs and Ar/Ad,especially by Qg.TC decreases with the increase of Qg following an exponential decay curve obviously;while with the increase of εs,TC and Qg,min rise,especially when Qg > 96 L/h;TC prolongs with the increasing of Ar/Ad.The effects of Qg and εs on the biodegradation of wastewater are also discussed,the results give reference to the improvement,amplification and operation of bioreactor.