Numerical simulation analysis of heat and mass transfer of saline wastewater in a falling film evaporation tube based on different inlet modes.

Autor: Kong XC; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China E-mail: donglelecheng@gmail.com., Liu YL; China University of Mining and Technology, Xuzhou, Jiangsu 221116, China., Li HS; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China E-mail: donglelecheng@gmail.com., Xue JL; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China E-mail: donglelecheng@gmail.com; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao, Shandong 266590, China., Liu B; College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China., Cheng DL; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China E-mail: donglelecheng@gmail.com; Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao, Shandong 266590, China., Gao Y; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China E-mail: donglelecheng@gmail.com; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao, Shandong 266590, China., Xiao XF; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China E-mail: donglelecheng@gmail.com; Institute of Yellow River Delta Earth Surface Processes and Ecological Integrity, Shandong University of Science and Technology, Qingdao, Shandong 266590, China.
Jazyk: angličtina
Zdroj: Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2023 May; Vol. 87 (9), pp. 2128-2141.
DOI: 10.2166/wst.2023.130
Abstrakt: Falling film evaporation technology is widely used in the treatment of salt-containing wastewater in coal chemical industry. However, there is still a lack of research on the inlet method of vertical falling film evaporation tubes. In this paper, the heat and mass transfer processes of saline wastewater under vertical and tangential inlets were investigated using numerical simulations. On this basis, the differences in flow and heat transfer processes between saline wastewater and pure water under tangential inlet were investigated. The results showed that the flow velocity of saline wastewater with a falling film evaporation tube in a tangential inlet mode was larger. Meanwhile, the turbulence in this way was more intense and the fluid temperature in the vertical tube was higher. Saline wastewater has higher temperature and smaller liquid volume fraction than pure water liquid membrane in the range of 193-1,000 mm from the inlet. The use of tangential inlet method to treat salt-containing wastewater has higher evaporation efficiency and is a very effective way to guide the improvement of heat transfer efficiency.
Databáze: MEDLINE
Externí odkaz: