期刊
APPLIED THERMAL ENGINEERING
卷 119, 期 -, 页码 52-62出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2017.02.113
关键词
Evaporation; Crystallization; Droplets of desulfurization wastewater; Thermogravimetric analysis; Differential scanning calorimetry; Stefan flow
资金
- Chongqing Science and Technology Committee [cstc2014yykfl30185]
- Fundamental Research Funds for the Central Universities [106112016CDJZR145507]
Relationship between evaporation and crystallization characteristics of a droplet of desulfurization wastewater from a coal-fired power plant and some operating conditions was studied experimentally using a thermogravimetric analyzer (TGA) with differential scanning calorimetry (DSC) function and a scanning electron microscope (SEM). The results shows that, between 15 degrees C/min and 45 degrees C/min, a higher temperature increasing rate leads to higher evaporation and crystallization rates. The increment in the evaporation rate, caused by the same increment of temperature increasing rate, is larger, when the temperature increasing rate is lower. In addition, the final temperatures, ranging from 90 degrees C to 150 degrees C, have little impact on the evaporation and crystallization rates of the 0.5 mu L droplet. Ultimately, for the droplets, ranging from 0.2 mu L to 2.5 mu L, evaporation rate increases with increasing volumes of the droplets, but the crystallization rate decreases. From the SEM results, it can be observed that the quantity of cracks on the surface of the crystals also declines with the increase in volumes. Furthermore, the Stefan flow becomes a significant and unneglectable factor in order to decrease the evaporation rate at the end of the evaporation period. (C) 2017 Elsevier Ltd. All rights reserved.
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