脱硫废水液滴旋转喷雾蒸发的数值模拟  

Numerical simulation of droplets of desulfurization wastewater rotary spray evaporation process

作　　者：陈嘉玮 陈海杰 李飞 詹凌霄 陈沾兴 杨林军[1] CHEN Jiawei;CHEN Haijie;LI Fei;ZHAN Lingxiao;CHEN Zhanxing;YANG Linjun(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Datang Environmental Industry Group Co.Ltd.,Beijing 100097,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096 [2]大唐环境产业集团股份有限公司,北京100097

出　　处：《中南大学学报（自然科学版）》2023年第9期3421-3431,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52076046);大唐环境产业集团股份有限公司资助项目(DTEG-SJY-015-2018)。

摘　　要：以江苏某燃煤电厂的脱硫废水旋转喷雾蒸发设备为研究对象,对液滴蒸发效果的影响因素开展数值模拟研究。通过用户自定义函数(UDF)的方法将反应工程法(REA)编译到Fluent DPM模型中,完善废水液滴蒸发过程的传热和传质数学模型;研究烟气分布器导流板偏转角度、雾化盘旋转方向等对液滴蒸发效果的影响。研究结果表明:REA-DPM模型能够准确地描述废水液滴的蒸发过程,与电厂现场测试结果的相对误差在5%以内,说明模型的可靠性较好;增大外导流板偏转角度,有利于增强烟气旋流强度,缩短液滴竖直蒸发距离,实现更好的液滴蒸发效果;液滴射流方向与烟气旋流方向相反时,液滴运动要克服烟气旋流,有利于避免液滴碰壁的发生,并且逆向流动的对流换热作用更强,能促进液滴的蒸发。Taking the rotary spray evaporation equipment of a coal-fired power plant in Jiangsu as the research object,the numerical simulation research on the influencing factors of droplet evaporation effect was carried out.The reaction engineering approach(REA)was compiled into the Fluent DPM model by user-defined function(UDF)to modify the mathematical model of heat and mass transfer.The effects of deflectors angle of the flue gas distributor and the rotation direction of the atomization disk were studied.The results show that the REA-DPM model can accurately describe the evaporation of droplets,and the relative error is within 5%,indicating that the model is reliable.Increasing the deflection angle of the outer deflector is conducive to enhancing the intensity of the flue gas cyclone,shortening the vertical evaporation distance of the droplet,and achieving better droplet evaporation effect.When the direction of the droplet jet is opposite to flue gas cyclone,the droplet movement needs to overcome the flue gas cyclone.It is conducive to avoiding the droplet sticking the wall,and the convective heat transfer effect of the reverse flow is stronger,which can promote the evaporation of the desulfurization wastewater droplet.

关 键 词：反应工程法 液滴蒸发 脱硫废水 旋转喷雾 数值模拟 

分 类 号：TK173[动力工程及工程热物理—热能工程]