Particle collision behavior and heat transfer performance in a Na<sub>2</sub>SO<sub>4</sub> circulating fluidized bed evaporator

Abstract A Na₂SO₄ circulating fluidized bed evaporation apparatus is designed and built by combining the fluidized bed heat transfer and fouling prevention technology and the evaporation process of Na₂SO₄ solution. 20%(mass fraction) Na₂SO₄ solution is selected as the liquid working medium. Polyoxymethylene (POM) and silicon carbide (SiC) particles are selected as the inert solid particles. The effects of the operating parameters, such as particle type, the amount of added particles (1%~3%), circulation flow velocity (0.37~1.78 m·s^-1) and heat flux (7.29~12.14 kW·m^-2), on the particle collision behavior and heat transfer performance are investigated. The results show that the addition of the POM and SiC particles can enhance heat transfer. The maximum enhancement factors are 9.5% and 13.4% for the POM and SiC particles, respectively, and the corresponding operating parameters are ε =1%,u=1.78 m·s^-1,q=7.29 kW·m^-2和ε =3%,u=0.37 m·s^-1,q=12.14 kW·m^-2. The characteristic frequency ranges of the collision acceleration signals are 0~1 000 Hz and 6 000~17 000 Hz for the liquid phase and solid phase, respectively. The generation of the vapor phase significantly strengthens the collision intensity of other phases. The standard deviation of the POM particles increases with the increase in the amount of added particles. The standard deviation of the SiC particles initially decreases and then increases at low circulation flow velocity but increases at high circulation flow velocity with the increase in the amount of added particles. The amount of added particles slightly influences the heat transfer coefficients of the two kinds of particles. The standard deviations and heat transfer coefficients of the two kinds of particles increase with the increase in circulation flow velocity. The heat transfer coefficients of the two kinds of particles obviously decrease with the increase in heat flux. The heat flux has no obvious effect on the standard deviation at low amount of added particles. At high amount of added particles, the standard deviation of POM particles increases with the increase in heat flux; however, the variation trend of the standard deviation of the SiC particles with heat flux is dependent on the circulation flow velocity.

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	JIANG Feng
	XU Di
	QI Guopeng
	LI Xiulun

Keywords： circulating fluidized bed evaporator particle collision behavior heat transfer enhancement sodium sulfate standard deviation

Received 2021-05-09;

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JIANG Feng, XU Di, QI Guopeng, LI Xiulun.Particle collision behavior and heat transfer performance in a Na₂SO₄ circulating fluidized bed evaporator[J] Chemcial Industry and Engineering, 2023,V40(4): 37-49

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