摘要
研究敏感参数对喷雾闪蒸的影响,优化实验参数,提高闪蒸效率。基于DPM离散模型、液滴破碎模型及液滴与气体之间的传热传质模型,对闪蒸室内液滴雾化闪蒸进行仿真模拟,分析不同参数对不平衡分数(NEF)、不平衡温差(NETD)和闪蒸效率等的影响。结果表明,随着液滴初始温度增加,液滴的NEF和NETD均减小,闪蒸效率则相反。液滴的NEF和NETD随着闪蒸环境压力提升而先减小后增大,闪蒸效率随着闪蒸压力的提升则不断下降。液滴的NEF和NETD随着喷嘴孔径的增大而增大,闪蒸效率则相反。液体初始温度为150℃,闪蒸环境压力为60 kPa,喷嘴直径为3 mm为最优参数。
Based on the DPM model,droplet breakage model,as well as the heat and mass transfer model between droplets and gas,the simulation of droplet atomization flash in flash chamber was carried out.Different parameters were studied to analyze the non-equilibrium fraction(NEF),the non-equilibrium temperature difference(NETD)and flash efficiency.The results showed that as the initial temperature of the droplet increased,the NEF and NETD of the droplet decreased,while the flashing efficiency showed opposite changing trend.The NEF and NETD of the droplets decreased first and then increased as the pressure of the flashing environment increased,but the flashing efficiency decreased as the flash pressure increased.The NEF and NETD of the droplet increased as the nozzle aperture increased,while the changing trend of flash efficiency was reversed.The initial temperature of the liquid was 150℃,the ambient flash pressure was 60 kPa,and the nozzle diameter was 3 mm,which was the optimal parameter.
作者
顾泽堃
陈启东
张斌
GU Zekun;CHEN Qidong;ZHANG Bin(School of Mechanics,Soochow University,Suzhou 215000,China;School of Mechanical Engineering,Changshu Institute of Technology,Changshu 215500,China)
出处
《化学反应工程与工艺》
CAS
北大核心
2019年第3期209-217,共9页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金(51705037)。
关键词
喷雾闪蒸
传热传质
高温高压
仿真
spray flashing
heat and mass transfer
high temperature and high pressure
simulation
