期刊
APPLIED THERMAL ENGINEERING
卷 155, 期 -, 页码 123-134出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2019.03.129
关键词
Heat transfer enhancement; Antiscaling; Circulating fluidized bed evaporator; Na2SO4 solution; SiC
资金
- open foundation of State Key Laboratory of Chemical Engineering [SKL-ChE-18B03]
- Municipal Science and Technology Commission of Tianjin, China [2009ZCKFGX01900]
An circulating fluidized bed evaporator of Na2SO4 solution is designed and built to investigate heat transfer and antiscaling performance by varying the amount of added particles (0.5%-2.0%), heat flux (6.47-13.65 kW.m(-2)) and circulation flow velocity (0.38 m.s(-1)-2.07 m.s(-1)).SiC particles are used as inert solid particles. The experiments are operated under normal pressure, and the operating temperatures of fluid is about 101-103 degrees C within the experimental range. The research results show the addition of SiC particles can not only effectively enhance the heat transfer performance in Na2SO4 solution, but also remove and prevent scaling. The effect of heat transfer performance is strongly dependent on the particle size. The maximum enhancing factor of 1 mm SiC particles is 17.1% at epsilon = 2%, u = 0.38 m.s(-1) and a heat flux of 8.97 kW.m(-2). With an appropriate amount of added particles, 1 mm SiC particles can effectively prevent scaling in the evaporation of Na2SO4 solution. The research findings may be beneficial to the application of fluidized bed heat transfer and antiscaling technology to industry.
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