蛋白粉尾气余热回收喷淋塔的热工特性研究
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摘要
大豆蛋白粉干燥工艺过程产生的高温尾气中蕴含着大量显热和潜热,而无填料、垂直逆流喷淋塔可以深度回收尾气中的余热。对此建立了喷淋塔的数值模型,并通过实验验证其准确性;应用所建模型,分析喷淋高度、入口水温、喷淋密度、尾气流速和尾气入口湿球温度对喷淋塔热回收性能的影响规律,进而获得了喷淋塔在实验工况范围内的换热效率曲线及经验关联式,为尾气喷淋热回收塔的优化设计与工程应用提供了分析工具。
The drying process of soybean protein powder produces high-temperature exhaust gas with a large amount of sensible heat and latent heat,and a kind of vertical countercurrent spray tower could largely recover the waste heat.The numerical model of the spray tower was developed and validated with the experimental data.On this basis,the effects of nozzle height,water inlet temperature,exhaust velocity,spray density and gas inlet wet bulb temperature on the heat recovery performance of spray tower were analyzed.Com bined with theoretical analysis,the heat exchange efficiency curve and the empirical equations within the scope of experimental conditions are obtained,which provide a basic tool for the design and engineering application of the high-temperature exhaust gas heat recovery spray tower.
The drying process of soybean protein powder produces high-temperature exhaust gas with a large amount of sensible heat and latent heat,and a kind of vertical countercurrent spray tower could largely recover the waste heat.The numerical model of the spray tower was developed and validated with the experimental data.On this basis,the effects of nozzle height,water inlet temperature,exhaust velocity,spray density and gas inlet wet bulb temperature on the heat recovery performance of spray tower were analyzed.Com bined with theoretical analysis,the heat exchange efficiency curve and the empirical equations within the scope of experimental conditions are obtained,which provide a basic tool for the design and engineering application of the high-temperature exhaust gas heat recovery spray tower.
引文
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[2]肇立春.大豆分离蛋白生产工艺探讨[J].粮油加工,2006(1):51-52ZHAO Li-chun.Discussion on the production process of soybean separation protein[J].Machinery for Cereals Oil and Food Processing,2006(1):51-52.(in Chinese)
[3]AI S,WANG B,LI X,et al.Analysis of a heat recovery system of the spray-drying process in a soy protein powderplant[J].Applied Thermal Engineering,2016,103:1022-1030.
[4]VINCI B J,WATTEN B J,TIMMONS M B.Modeling gas transfer in a spray tower oxygen absorber[J].Aquacultural Engineering,1997,16(1):91-105
[5]SCHMIDT B,STICHLMAIR J.Two-phase flow and mass transfer in scrubbers[J].Chemical Engineering&Technology,1991,14(3):162-166
[6]方立军.喷淋式脱硫塔脱硫特性的试验研究[J].热能动力工程,2011,26(5):604-608.FANG Li-jun.Experimental study on desulfurization characteristics of spray desulfurization tower[J].Journal of Engineering for Thermal Energy and Power,2011,26(5):604-608.(in Chinese)
[7]张寅平,朱颖心,江亿.水-空气处理系统全热交换模型和性能分析[J].清华大学学报(自然科学版),1999(10):35-38.ZHANG Yin-ping,ZHU Ying-xin,JIANG Yi.Heat exchange model and performance analysis for Water-air treatment system[J].Journal of Tsinghua University:Science and Technology,1999(10):35-38.(in Chinese)
[8]周阳,黄翔,张秉笃,等.立式喷水室热工性能的实验研究[J].制冷与空调(北京),2000(2):37-43.ZHOU Yang,HUANG Xiang,ZHANG Bing-duo,et al.Experimental study on thermal performance of vertical jet chamber[J].Refrigeration&Air-Conditioning(Beijing),2000(2):37-43.(in Chinese)
[9]ROBERT A P.ASHRAE Handbook:HVAC Systems and Equipment[Z].Atlanta:ASHRAE Inc.,1996:36.1~36.20.
[10]周兴禧.制冷空调工程中的质量传递[M].上海:上海交通大学出版社,1991.ZHOU Xing-xi.Quality Transfer in Air Conditioning Engineering[M].Shanghai:Shanghai Jiao Tong University Press,1991.(in Chinese)
[11]FRANK P I,DAVID P D.Fundamentals of Heat and Mass Transfer[M].4th ed.New York:John Wiley&Sons,Inc.,1996:374
[12]连之伟.热质交换原理与设备[M].北京:中国建筑工业出版社,2011.LIAN Zhi-wei.Heat Transfer Principle and Equipment[M].Beijing:China Building Industry Press,2011.(in Chinese)
[13]HETSRONI G.Handbook of Multiphase Systems[Z].New York:McGraw Hill,1982.
[14]李刚,黄翔,颜苏芊,等.喷水室热、质传递的理论分析[J].纺织高校基础科学学报,2002(4):337-340.LI Gang,HUANG Xiang,YAN Su-qian,et al.Theoretical analysis for heat and mass transfer of water jet chamber[J].Journal of Basic Science of Textile University,2002(4):337-340.(in Chinese)
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