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Investigation of pressure overshoot in gas-fluidized beds
2001 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This paper presents an investigation of pressure overshoot in gas-fluidized beds using discrete element method (DEM) simulation. The simulations were performed using two-dimensional fluidized beds, where the thickness of the bed was equal to the diameter of a single particle. Particles of 0.5 to 1.0 mm in diameter and 970 to 3490 kg/m3 in density were used. The pressure overshoot was measured at incipient fluidization conditions. In order to compare the results obtained for different particle diameters, the pressure drop was normalized as a percentage of the constant pressure drop for fully fluidized conditions. For Geldart Group A particles, a linear relationship between the interparticle force and the pressure overshoot was obtained. A similar relationship was also found between particle density and pressure overshoot. The pressure overshoot was found to increase exponentially with increasing particle diameter when the width of the bed was held constant. However, a linear relationship between particle diameter and pressure overshoot was observed when the width of the bed was increased proportionally to the increase in particle diameter. The effect of particle-wall attractive force was also investigated. It was found that a small particle-wall attractive force resulted in a decrease in the pressure overshoot, but a strong particle-wall attraction could cause the pressure overshoot to increase.

Place, publisher, year, edition, pages
Keyword [en]
Technology, incipient, fluidization, pressure, overshoot, DEM, fluidisering, trycktopp
Keyword [sv]
URN: urn:nbn:se:ltu:diva-49772ISRN: LTU-EX--01/310--SELocal ID: 7159ee37-a234-4ce1-bdfe-5ba5df5c0e17OAI: diva2:1023119
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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