登录
注册
E-alert
登录
注册
E-alert
NUMERICAL SIMULATION ANALYSIS OF FLOW CHARACTERISTICS OF DESCENDING FILM EVAPORATION OF SALT-CONTAINING WASTEWATER IN COAL CHEMICAL INDUSTRY
-
摘要: 在黄河流域煤化工高盐废水处理中，降膜蒸发技术由于具有传热系数高、物料停留时间短及处理效率高等优点而被广泛应用，但蒸发过程因流动特性差异而导致蒸发传热效果不佳，成为煤化工"近零排放"处理的关键技术要点之一。通过数值模拟研究3% NaCl在不同入口速度下的降膜流动特性差异，并对比分析了3%、5%和7% NaCl降膜流动特性的轴向与径向变化。结果表明：在不同入口速度下，含盐污水（3% NaCl）液膜温度和液体体积分数变化影响更为明显，入口速度越小，温度升高和液体体积分数减小更为迅速。同一入口速度下，3%、5%和7% NaCl轴向与径向温度、轴向湍流强度、轴向与径向液体体积均相差不大，而浓度高的含盐污水相较于其他组分液体流动轴向速度和径向速度略大，径向湍流强度则相反。Abstract: In the treatment of high salt wastewater emitted from the coal chemical industry in the Yellow River basin, the falling film evaporation technology was widely used, due to its advantages of high heat transfer coefficient, short material residence time and high treatment efficiency, but the evaporation process was not effective due to the difference of flow characteristics, which became one of the keys to the near zero discharge treatment of coal chemical industry. In this paper, the differences in falling film flow characteristics of 3% NaCl at different inlet velocities were studied by numerical simulation, and the axial and radial changes of the falling film flow characteristics of 3%, 5% and 7% NaCl were compared. The results showed that the effect of the change in liquid film temperature and liquid volume fraction of saline wastewater (3% NaCl) was more obvious at different inlet velocities, and the smaller the inlet velocity, the more rapid the temperature increased and the liquid volume fraction decreased. At the same inlet velocity, the difference between axial and radial temperature, axial turbulence intensity and axial and radial liquid volume of 3%, 5% and 7% NaCl was not significant, while the axial velocity and radial velocity of saline effluent with high concentration were slightly higher than other components, while the radial turbulence intensity was the opposite.
-
[1] 郑利民, 郭卫新, 黄福贵,等. 黄河流域水环境污染现状及防治[J]. 西北水电, 2007,1(1):5-8. [2] 路瑞, 马乐宽, 杨文杰,等. 黄河流域水污染防治"十四五"规划总体思考[J]. 环境保护科学, 2020, 46(1):21-26. [3] LEFEBVRE O, MOLETTA R. Treatment of organic pollution in industrial saline wastewater:a literature review[J].Water Research, 2006,40:3671-3682. [4] 李柄缘,刘光全,王莹,等. 高盐废水的形成及其处理技术进展[J].化工进展,2014,33(2):493-497. [5] 张文,林长喜,彭永臻.现代煤化工废水近零排放技术集成与优化建议[J].环境工程,2021,39(11):41-45. [6] 贾西部.高盐废水调质后在余热烟气中的蒸发应用[J].环境工程,2018,36(5):49-53. [7] 傅伟良,张城镇,陈蒙,等.机械蒸汽再压缩(MVR)热泵干燥的研究进展[J].环境工程,2021,39(5):131-134. [8] SHAMMIRI M, SAFAR M. Multi-effect distillation plants:state of the art[J]. Desalination,1999, 126(1/2/3):45-59. [9] SHAKOURI M, GHADAMIAN H, SHEIKHOLESLAMI R. Optimal model for multi effect desalination system integrated with gas turbine[J]. Desalination,2010, 260(1):254-263. [10] 高丽丽,张琳,杜明照.MVR蒸发与多效蒸发技术的能效对比分析研究[J].现代化工, 2012,32(10):84-86. [11] LU K, LV Y, BAI Y X, et al. Experimental investigation and theoretical modeling on scale behaviors of high salinity wastewater in zero liquid discharge process of coal chemical industry[J]. Chinese Journal of Chemical Engineering, 2020, 28(4):969-979. [12] 刘友乐,刘冰,高宇,等. 不同参数对含盐污水在蒸发管中流动特性影响的数值模拟分析[J].石油炼制与化工,2020, 51(6):13-18. [13] LIU B,WANG X L,LIU L,et al. Simulation analysis of flow velocity and liquid film of saline wastewater in falling film evaporation[J]. Environmental Technology & Innovation,2020, 19:100790. [14] VICTOR Y, STEVEN A O. Renormalization group analysis of turbulence. I. Basic theory[J]. Journal of Scientific Computing,1986, 1(1):3-51. [15] 北京石油化工工程公司. 氯碱工业理化常数手册(修订版)[M]. 北京:化学工业出版社, 1988. [16] SHARQAWY M, LIENHARD V, ZUBAIR S. Erratum to thermophysical properties of seawater:a review of existing correlations and data[J]. Desalination Water Treatment, 2012, 44(1):361. 期刊类型引用(2)
1. 李璐，张玥，邵鸿渝，倪敏，黄勇，潘杨. 侧流与主流磷回收工艺对比及调控因子分析. 中国环境科学. 2024(01): 103-113 . 
百度学术2. 高鹏飞，丁燕燕，黄博，刘缘，潘杨，黄勇. 序批式生物膜法对污水中污染物的去除性能及其对磷的富集性能. 环境工程学报. 2024(08): 2202-2209 . 百度学术其他类型引用(1)
-
点击查看大图
计量
- 文章访问数: 346
- HTML全文浏览量: 63
- PDF下载量: 23
- 被引次数: 3
下载:
