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Investigations of Hydrodynamics of Fixed Bed Reactor: Counter-Current Flow

Norazahar, Norafheeza (2006) Investigations of Hydrodynamics of Fixed Bed Reactor: Counter-Current Flow. Universiti Teknologi Petronas. (Unpublished)

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Abstract

The residence time distribution (RTD) of a pilot plant scale packed bed reactor was studied in the present study using air - water system to investigate the effect various gas/liquid volumetric ratio on the residence time distribution. The ranges of air - water ratio is chosen to simulate the hydrogen/oil ratio of typical bench scale hydroprocessing units, noting the difference that might arise due to the different physical properties of theliquid. The experiments were conducted in counter-current mode and the effects of gas/liquid velocities on the hydrodynamics of the reactor were investigated. This study is done using the tracer method - specifically the pulse input method. The packed bed reactor used in this study is packed with8x8 mm Raschig rings. Results show that the increasing gas/liquid ratio increases the mean residence time. However, operating liquid hold-up and the value of Peclet number, which gives an indication to the degree of axial dispersion in the system, increase. Second moment analysis of the reactor, namely the variance of the system, shows a reduction in value with decreasing gas/liquid ratio suggesting wider liquid distribution through the system at lowgas flow rates. The discrepancies in experimental results suggested that there are conditions to be altered in order to eliminate the inconsistency.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Reactor Technology
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 27 Sep 2013 11:09
Last Modified: 25 Jan 2017 09:46
URI: http://utpedia.utp.edu.my/id/eprint/7050

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