摘要
针对废水回收喷射闪蒸过程中的气液两相喷射雾化过程,采用数值模拟方法研究某直流式喷嘴的喷射规律和雾化特性。建立液态水-不同结构喷嘴的物理模型,研究喷嘴的喷射规律及其影响因素,获得不同运行条件下的液滴扩散范围和运动轨迹。研究结果表明:相较于改变进口压力,改变喷嘴结构对喷射规律的影响更大。随着喷孔直径的增大,喷雾液滴速度与含水率逐渐增大,且当孔径增大1倍时,速度提升65%,含水率提高61.5%;随着表征喷嘴结构的无量纲数值β增大,喷雾液滴速度与含水率呈现逐渐增大的趋势,且当β值增大2倍时,速度提升85.4%,含水率提高45.5%。速度与含水率的衰减趋势均随孔径与β值的增大逐渐变缓,喷射角和含水量面积随之增大。研究结果为提高回收燃煤发电机组中废水的效率和优化喷嘴结构提供了理论依据。
The flash spray technology is applied to the waste water recovery and utilization of coal-fired generating units, which can realize the deep treatment of waste water with low energy consumption.For the process of waste water spray process, this work carries out the numerical simulation on the rules of a direct current a once-through nozzle jet and atomization characteristics of liquid water-different nozzle structure physical model, studies the injection of nozzle and its influencing factors, droplet spread range under different operating conditions and trajectory.The results show that, compared with the change of inlet pressure, the change of nozzle structure has a greater effect on the spraying law.With the increase of nozzle diameter, the spray droplet velocity and moisturecontent gradually increase.When the aperture increases by 1 time, the velocity increases by 65% and the moisturecontent increases by 61.5%.With the increase of the dimensionless value β, the droplet velocity and moisturecontent increase gradually.When the β value increase by 2 times, the droplet velocity increase by 85.4%, and the moisturecontent increase by 45.5%.The decreasing trend of the droplet velocity and moisturecontent decreases gradually with the increase of the aperture and β value, and the spray angle and water content area increase accordingly.The results provide a theoretical basis for improving the efficiency of waste water recovery and optimizing nozzle structure in coal-fired power generation group.
作者
胡浩威
时文博
HU Haowei;SHI Wenbo(Anhui Advanced Technology Research Institute of Green Building,Anhui Jianzhu University,Hefei 230601,China;Laboratory of Indoor Thermal and Moisture Environment in Buildings,Anhui Jianzhu University,Hefei 230601,China)
出处
《重庆理工大学学报（自然科学）》
CAS
北大核心
2022年第3期215-222,共8页
Journal of Chongqing University of Technology：Natural Science
基金
“十三五”国家重点研发计划项目(2018YFB0604303)
国家自然科学基金项目(51576156)。
关键词
直流式喷嘴
喷射规律
无量纲
压力降
数值模拟
速度
含水率
喷射角
direct current nozzle
spray characteristics
dimensionless
pressure drop
numerical simulation
speed
moisturecontent
spray angle
