NUMERICAL SIMULATION ANALYSIS OF FLOW CHARACTERISTICS OF DESCENDING FILM EVAPORATION OF SALT-CONTAINING WASTEWATER IN COAL CHEMICAL INDUSTRY

ZHANG You; ZHAO Tingting; DU Ranli; LI Huashan; KONG Xiangcheng; XUE Jianliang

doi:10.13205/j.hjgc.202306003

Volume 41 Issue 6

Jun. 2023

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ZHANG You, ZHAO Tingting, DU Ranli, LI Huashan, KONG Xiangcheng, XUE Jianliang. NUMERICAL SIMULATION ANALYSIS OF FLOW CHARACTERISTICS OF DESCENDING FILM EVAPORATION OF SALT-CONTAINING WASTEWATER IN COAL CHEMICAL INDUSTRY[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 17-22,31. doi: 10.13205/j.hjgc.202306003

Citation:

ZHANG You, ZHAO Tingting, DU Ranli, LI Huashan, KONG Xiangcheng, XUE Jianliang. NUMERICAL SIMULATION ANALYSIS OF FLOW CHARACTERISTICS OF DESCENDING FILM EVAPORATION OF SALT-CONTAINING WASTEWATER IN COAL CHEMICAL INDUSTRY[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 17-22,31. doi: 10.13205/j.hjgc.202306003

Citation:

ZHANG You, ZHAO Tingting, DU Ranli, LI Huashan, KONG Xiangcheng, XUE Jianliang. NUMERICAL SIMULATION ANALYSIS OF FLOW CHARACTERISTICS OF DESCENDING FILM EVAPORATION OF SALT-CONTAINING WASTEWATER IN COAL CHEMICAL INDUSTRY[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 17-22,31. doi: 10.13205/j.hjgc.202306003

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NUMERICAL SIMULATION ANALYSIS OF FLOW CHARACTERISTICS OF DESCENDING FILM EVAPORATION OF SALT-CONTAINING WASTEWATER IN COAL CHEMICAL INDUSTRY

doi: 10.13205/j.hjgc.202306003

1. Shuifa Planning and Design Co., Ltd., Jinan 250014, China;
2. Jiangsu Hehai Environmental Science Research Institute Co., Ltd., Nanjing 210024, China;
3. Shandong Linyi Ecological Environment Monitoring Center, Linyi 276007, China;
4. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
5. Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Qingdao 266590, China

Received Date: 2022-08-31
Available Online: 2023-09-02

Abstract

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.
- coal chemical enterprises,
- saline wastewater,
- falling film evaporation,
- numerical simulation

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References(16)

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