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Numerical Analysis on the Process of CaCO3 Fouling of MVR Evaporation Tube for Landfill Leachate Concentration
Received date: 2016-05-13
Revised date: 2016-06-12
Online published: 2016-08-30
Based on the related theories of heat and mass transfer in vertical falling film evaporation, the mathematical model of the process of CaCO3 fouling in the tube was established. It was applied to the research on the process of CaCO3 fouling in the vertical drop film evaporation tube of mechanical vapour recompression (MVR) for landfill leachate concentration, and the fouling parameters’ change rules of different stages were obtained. The results showed: In the initial stage of fouling, the deposition rate of CaCO3 was much larger than the removal rate in the evaporation tube, the total rate was larger, and the fouling layer thickness and fouling resistance increased rapidly, which caused that the total heat transfer coefficient of the evaporator reduced quickly, and that the evaporation capacity and concentration ratio of the evaporator decreased rapidly; in the middle stage of fouling, the total rate of CaCO3 became smaller, the accumulation rate of fouling became slow, and the change trend of all the fouling parameters was from fast to slow; in the end stage of fouling, the total rate of CaCO3 reached zero, the fouling no longer increased, and all the fouling parameters gradually stabilized; compared to the evaporation tube inlet, liquid film flow in outlet was smaller and the concentration of CaCO3 was higher, so the fouling in outlet was more serious. And affected by the whole evaporation tube fouling, liquid film flow and CaCO3 concentration in outlet greatly changed, which caused all the fouling parameters to change more quickly and tend to be stable relatively earlier.
YANG Cheng-zhi , HUANG Chong , FENG Zi-ping , LI Shuai-qi , HE Shi-hui . Numerical Analysis on the Process of CaCO3 Fouling of MVR Evaporation Tube for Landfill Leachate Concentration[J]. Advances in New and Renewable Energy, 2016 , 4(4) : 320 -327 . DOI: 10.3969/j.issn.2095-560X.2016.04.009
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