2×350MW燃煤发电机组主烟道脱硫废水蒸发数值模拟  

NUMERICAL SIMULATION FOR FGD WASTEWATER EVAPORATION IN THE FLUE DUCT OF A 2×350 MW COAL-FIRED UNIT

作　　者：周川 吴其荣 喻江涛 秦福初 ZHOU Chuan;WU Qi-rong;YU Jiang-tao;QIN Fu-chu(SPIC Yuanda Envirnoment-Protection Engineering Co.,Ltd,Chongqing 401122,China;School of Environment,Tsinghua University,Beijing 100084,China;School of Resource&Environmental Engineering,Yibin University,Yibin 644000,China)

机构地区：[1]国家电投集团远达环保工程有限公司,重庆401122 [2]清华大学环境学院,北京100084 [3]宜宾学院资源与环境工程学院,四川宜宾644000

出　　处：《环境工程》2020年第5期96-101,共6页Environmental Engineering

基　　金：国家重点研发计划“大气污染成因与控制技术研究”重点专项(2017YFC0210202)。

摘　　要：针对某2×350MW燃煤发电机组主烟道脱硫废水蒸发过程进行了CFD数值模拟,分析了蒸发过程中烟道内的气液分布和变化规律,喷嘴参数对蒸发性能的影响,以及蒸发过程随着负荷降低的变化规律。结果表明:液滴颗粒可在烟道内完全蒸发;粒径从40μm增加到80μm时,液滴蒸发时间从0.26 s增加到0.62 s,蒸发距离从6.15 m增加到13.41 m;蒸发时间和蒸发距离与液滴粒径近似呈线性关系;蒸发时间随着喷射角度的增加而减小;喷射角度为90°时,蒸发距离最短;喷射角度为120°时,蒸发距离最大;3种喷射方向中,逆流喷射方式蒸发时间最长,但蒸发距离最短;负荷降低,蒸发时间增加;负荷由75%降低至50%时,蒸发距离有显著提升。A series of numerical simulations were conducted for FGD wastewater evaporation occurred in a flue duct of a 2×350 MW coal-fired unit.The evolution and distribution of gas-liquid was revealed and the dependence of residence time and required distance for evaporation on spray parameters and unit load was discussed.The results showed that the liquid droplet could evaporate completely as the droplet diameter was less than 80μm;while the diameter of liquid droplet increased from 40μm to 80μm,the residence time for evaporation increased from 0.26 s to 0.62 s and the required distance for droplet evaporating completely increased from 6.15 m to 13.41 m;the residence time and required distance for evaporation had a linear relation with the droplet diameter.It also presented that enhancing the injection-angle decreased the residence time of evaporation;as the injection-angle was 90°,the required distance of evaporation was the largest;in contrast,when the injection-angle was 120°,the required distance of evaporation was the smallest;while the injection-direction was opposite to the flow direction of flue gas,the residence time of evaporation was the longest and required distance of evaporation was the shortest in the three cases;the residence time of evaporation was larger with a lower load;an obvious increase in the required distance of evaporation was observed with the load dropping from 75%to 50%.

关 键 词：燃煤机组 脱硫废水 蒸发 数值模拟 

分 类 号：X773[环境科学与工程—环境工程]