摘要
建立了液滴在低温烟气中运动和蒸发过程的数学模型,数值研究不同物性液滴在有相对速度及相对温度的烟气环境中的蒸发特性,获得了液滴温度、直径随时间的变化规律,液滴直径、速度和烟气速度对蒸发的影响。计算结果表明:在相同的条件下,双组分水溶液液滴与单组分水液滴在蒸发过程中温度变化不同而直径变化相同,纯水液滴蒸发最快,其次是酸溶液液滴和盐溶液液滴,碱溶液液滴蒸发最慢。在研究的温度及速度范围内,不同物性液滴直径随时间变化都呈指数递减规律。研究结果还表明,液滴粒径越小,随气相运动的能力越强,液滴初速度对完全蒸发时间影响越小。烟气速度和液滴初速度的改变对液滴蒸发速度的影响都较小。
A mathematical model for the motion and evaporation of droplet were given to investigate the evaporation characteristics of different physical and chemical parameters liquid drop in low temperature flue gas with the relative velocity and temperature.The average temperature and diameter of droplet during its evaporation process were analyzed,also the influence of the droplet diameter and velocity and the flue gas velocity.The results show that the temperature variation processes are different for bicomponent droplets and single-component droplets under the same conditions,but their diameter variation are same.The sequence of the evaporation rate form biggest to smallest is water drop,acid and salt drop and alkalescency solution.The diameter of droplet with different physical and chemical parameters investigated reveals the same index change rule,within the range of temperature and velocity.The smaller the diameter of droplet is,the easier it reaches the flue gas velocity,and the less is the influences of the initial drop velocity to the droplet life time.The effects of change of flue gas velocity and liquid drop initial velocity on evaporation rate of droplet are small.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第26期62-68,共7页
Proceedings of the CSEE
基金
重庆市科委自然科学基金项目(CSTC2008BB6054
CSTC2006BA7035)~~
关键词
蒸发特性
液滴
不同物性
低温烟气
evaporation characteristics
liquid droplet
different physical and chemical parameters
low temperature flue gas
作者简介
冉景煜（1968），男，教授，博士生导师，主要从事先进能动系统转换与利用，燃烧与环保方面的教学与研究工作，ranjy@cqu．edu．cn
张志荣（1975），女，博士研究生，主要研究方向为气液两相流动与传热。
