Experimental Study on Attrition of Vapor-Liquid-Solid Flow Against Wall of a Graphite Tube in Heat Exchanger

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Abstract

Attrition of vapor-liquid-solid flow against the wall of a graphite heating tube was experimentally studied in the three-phase fluidized bed evaporator with signal acquisition and processing system. Time series data of vibration acceleration of the tube were acquired. Standard deviation and kurtosis of the vibration signals were analyzed to evaluate the radial collision strength of solid particles on the tube wall. The relationship between measured circulating flow rate and axial friction impact degree of solid particles against tube wall was also studied. The weight and elemental analysis of the attrition products were analyzed. Combined with the results mentioned above, the influence factors of wear rate of graphite tube wall impacted by glass beads were discussed. The main results are as follows. The mass wear rate of graphite tube wall increases with the increase of heating steam pressure and solid holdup. Under the same conditions of steam pressure and solid holdup, the wear of graphite tube is more serious for the smaller diameter of particles. Kurtosis of acceleration signals shows that the impact frequency of particles on the wall of tube is the main influence factor of wear rate of graphite tube wall. The results of this study can provide some guidelines for the application of three-phase fluidized bed heat exchanger technique to system of graphite tube heat exchanger.

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	Articles by authors
	Ma Yue
	Liu Mingyan
	An Min
	Xu Xiaoping

Keywords： vapor-liquid-solid flow； graphite tube； vibration； heat exchanger； attrition

Received 2014-12-08;

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Cite this article:

Ma Yue, Liu Mingyan, An Min, Xu Xiaoping.Experimental Study on Attrition of Vapor-Liquid-Solid Flow Against Wall of a Graphite Tube in Heat Exchanger[J] Chemcial Industry and Engineering, 2016,V33(4): 61-66

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