Investigation on Heat Transfer between Gas and Rubber Particles in Fixed Bed and Vibrated Fluidized Bed
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摘要: 从分析固定床中的径向导热系数出发,对各参数对径向导热系数的影响进行了深入的分析.结果表明,为降低橡胶颗粒低导热率对气固传热性能的不利影响,必须运用固定床的后一个发展阶段即流化床来完成气固间的换热过程.对传热关系式的分析表明,振动流化床中气固传热受振动强度的影响更大.同普通流化床相比,在达到相同的传热效果的情况下,振动流化床可以较大幅度地降低气流的速度,具有节能的效果.Abstract: The effect of parameters on radial heat conductive coefficient is analyzed by researching into radial heat conductivity of rubber particles in fixed bed. The fluidized bed should be applied to enhance the process of heat transfer between gas and solids in order to minimize the effect of lower heat conductivity of rubber. It is indicated that vibration strengthen more than gas velocity affects heat transfer in vibrated fluidized bed (VFB) from the analysis of the correlations. In the case of reaching the same heat transfer results, the VFB can decrease gas velocity more than common fluidized bed can do, and energy conservation may be realized by using VFB technology.
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Key words:
- fixed bed /
- fluidized bed reactors /
- heat transfer
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[1] 李雪松.绝热固定床中气固两相非稳态传热特性研究 .西安:西安交通大学能源与动力工程学院,1994. [2]斋藤文良.ぜぃ性碎料の破碎に关する基础的研究[J].粉体工学会志,1983,20(4):233~235． [3]Yagi S, Kunii D. Studies on effective thermal conductivities in packed beds[J].AIChE J,1957,3(3):373~381． [4]Kunii D, Smith J M. Heat transfer characteristics of porous rocks[J]. AIChE J,1960,6(1):71~78． [5]袁乃驹,丁富新.化学反应工程基础[M].北京:清华大学出版社,1988． [6]罗森诺 W M主编.传热学应用手册[M].谢 力译.北京:科学出版社,1992． [7]杨世铭.传热学[M].第2版.北京:高等教育出版社,1987． [8]Ranz W E, Marshall W R. Evaporation from drops (part II)[J]. Chem Eng Progr, 1952,48(4):173~180． [9]Ranz W E. Friction and transfer coefficients for single particles and packed beds[J]. Chem Eng Progr,1952,48(4):247~253． [10] 王晓新,郭有仪,束鹏程,等.固定床移动床传热模型及低温传热分析[J].低温与超导,1996,24(4):62~67． [11]王晓新.振动流化的低温气固传热研究 .西安:西安交通大学能源与动力工程学院,1997． [12]王 莉.低温绝热移动床中气固两相传热特性的研究 .西安:西安交通大学能源与动力工程学院,1995． [13]戴锅生.传热学[M].北京:高等教育出版社,1991． [14]Kunii D, Levenspiel O. Fluidization engineering[M]. New York:Wiley,1969． [15]郭有仪,王晓新,束鹏程.振动对流化床性能影响的分析研究[J].化工装备技术,1997,18(2):1~3． -
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