Study on particle collision behavior in a liquid-solid down-flow circulating fluidized bed

Abstract A cold-model liquid-solid down-flow circulating fluidized bed evaporator is designed and built. The effect of the axial position and operating parameters on the particle-to-wall collision behavior is investigated to reveal the heat transfer enhancement and fouling prevention mechanism. Water and different sizes of polyformaldehyde particles and glass beads are selected as the working media in the experiments. The collision acceleration signals are dealt with the frequency and time domains analyses such as the power spectral density, kurtosis and standard deviation under different operating parameters including the amount of added particles (0—2.0%) and circulation flow rate (2.15—5.16 m³·h^-1). The results show that the frequency range of the collision acceleration signals are from 0 to 2 000 Hz and 6 000 to 16 000 Hz for the liquid and solid phases, respectively. The standard deviation of the particle-to-wall collision acceleration signals initially decreases and then increases along the axial direction of the down-flow bed from the top to the bottom; however, the kurtosis increases. The standard deviation increases, but the kurtosis decreases with the increases of the amount of added particles and circulation flow rate. The standard deviation of the polyformaldehyde particles initially decreases and then increases with the increase of particle size at low amount of added particles; however, the kurtosis obviously increases. The standard deviation and kurtosis of the polyformaldehyde particles increase with the increase of particle size at high amount of added particles, but the amplitude of the increase in kurtosis is small. The standard deviation of the glass bead is small, but the kurtosis is obviously higher than that of the polyformaldehyde particles. The three-dimensional diagrams are established to reflect the effect of the operating parameters on the particle collision behavior. The findings are beneficial to promoting the industrial application of the fluidized bed heat transfer and fouling prevention technology.

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	JIANG Feng
	LIU Yi
	QI Guopeng
	LI Xiulun

Keywords： particle collision behavior liquid-solid circulating fluidized bed down-flow bed power spectral density standard deviation kurtosis

Received 2021-03-10;

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JIANG Feng, LIU Yi, QI Guopeng, LI Xiulun.Study on particle collision behavior in a liquid-solid down-flow circulating fluidized bed[J] Chemcial Industry and Engineering, 2022,V39(3): 49-59

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