脱硫废水烟气喷射蒸发流动特性实验研究

doi:10.12096/j.2096-4528.pgt.19152

发电技术 ›› 2020, Vol. 41 ›› Issue (5): 561-569.DOI: 10.12096/j.2096-4528.pgt.19152

• 厂界环保岛与数字孪生技术 • 上一篇

脱硫废水烟气喷射蒸发流动特性实验研究

吴文庆(),杜小泽*(),杨立军()

电站设备状态监测与控制教育部重点实验室(华北电力大学), 北京市昌平区 102206

收稿日期:2019-10-21 出版日期:2020-10-30 发布日期:2020-11-02
通讯作者: 杜小泽
作者简介:吴文庆(1995),男,硕士研究生,主要研究方向为喷雾蒸发在脱硫废水处理方面的应用, 1182202110@ncepu.edu.cn|杨立军(1970),男,博士,教授,研究方向为火力发电厂空冷技术、太阳能热发电技术,烟气除尘技术和二氧化碳捕集技术等, yanglj@ncepu.edu.cn
基金资助:
国家自然科学基金项目(51676069);国家自然科学基金项目(51821004)

Experimental Study on Characteristics of Spraying Evaporation Flow of FGD Wastewater in Flue Gas

Wenqing WU(),Xiaoze DU*(),Lijun YANG()

Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education(North China Electric Power University), Changping District, Beijing 102206, China

Received:2019-10-21 Published:2020-10-30 Online:2020-11-02
Contact: Xiaoze DU
Supported by:
National Natural Science Foundation of China(51676069);National Natural Science Foundation of China(51821004)

摘要/Abstract

摘要：

确保喷雾液滴在接触烟道壁面前完全蒸发，是保障电站脱硫废水在锅炉尾部烟道内蒸发处理安全运行的关键。喷雾液滴的破碎、聚并等动力学行为，以及液滴群的粒径分布和速度等因素的影响机制，是喷雾蒸发的主要特性。设计搭建了热态风洞实验台，利用激光粒度分析仪和粒子图像测速仪（particle image velocimeter，PIV），在不同的引射空气压力、喷嘴水流量，以及风速、加热空气温度等条件下，对喷雾液滴群的粒径变化和速度变化进行了测量和分析。实验结果表明：以大液滴形态离开喷嘴的射流在引射气流的携带作用下，因破碎而形成小液滴，而后液滴间聚并效果会显现出来。液滴初始粒径仅与引射气体压力和水流量有关；风速的提高一定程度上会促进液滴间的聚并。提高高压气体压力、温度、风速以及减小水流量均有助于提高液滴群速度，其中提高风速对液滴群的增速效果最为明显。研究结果为喷雾的数值模拟及工程应用改进方向提供了参考。

关键词: 喷雾蒸发, 液滴破碎, 液滴粒径, 平均速度

Abstract:

The complete evaporation of flue gas desulfurization (FGD) wastewater droplets before they reach the flue duct wall is the key of safe operation of FGD wastewater treatment system in tail flue duct in thermal power plants. The main characteristics of spray evaporation include pneumatic behaviors such as breakup and polymerization, influence mechanism of droplet group size distribution and velocity. A wind tunnel was designed and constructed, and the particle size distribution and velocity of the sprayed droplet group were measured and analyzed by laser particle size analyzer and particle image velocimetry (PIV) system in different inlet conditions of injected gas pressure, nozzle water flow rate, wind speed and air heating temperature. The experimental results show that the droplets injected from the nozzle are relative bigger initially and will become smaller because of breakup. Then the droplets are polymeric. The initial particle size of the droplet is only related to the injected gas pressure and water flow. The increase of wind speed will slightly contribute to the aggregation between the droplets. Increasing the pressure of the gas, temperature, wind speed, and reducing the water flow will all contribute to the speed of the droplet group. Especially, the effect of wind speed is more obvious. The results provide the reference for the spray numerical simulation and improvement direction of spray evaporation in engineering application.

Key words: spray and evaporate, droplet breakup, droplet diameter, average velocity

中图分类号:

TM621

吴文庆,杜小泽,杨立军. 脱硫废水烟气喷射蒸发流动特性实验研究[J]. 发电技术, 2020, 41(5): 561-569.

Wenqing WU,Xiaoze DU,Lijun YANG. Experimental Study on Characteristics of Spraying Evaporation Flow of FGD Wastewater in Flue Gas[J]. Power Generation Technology, 2020, 41(5): 561-569.

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脱硫废水烟气喷射蒸发流动特性实验研究

Experimental Study on Characteristics of Spraying Evaporation Flow of FGD Wastewater in Flue Gas

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