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Phoretic phenomena in tar vapor‐particulate mixture separation from fuel gas streams
Author(s) -
Vasudevan T. V.,
Gokhale A. J.,
Mahalingam R.
Publication year - 1985
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450630606
Subject(s) - condensation , chemistry , thermophoresis , particulates , mass transfer , particle (ecology) , water vapor , tar (computing) , scrubber , wood gas generator , data scrubbing , heat transfer , thermodynamics , chromatography , waste management , coal , nanofluid , physics , oceanography , organic chemistry , computer science , programming language , geology , engineering
Analytical models were developed to predict the performance of a spray scrubber for separation of tars from gasifier off‐gas streams. The models included heat transfer, mass transfer, condensation, nucleation, temperature and flow fields, and various phoretic phenomena involved in droplet‐particle and droplet‐vapor interaction and collection. The models indicate that for the tar particulates, both Brownian diffusion and inertial impaction, rather than diffusiophoresis and thermophoresis, are the more important phoretic forces causing the collection. For the limiting case of all tars being present only as vapor, the efficiency of their removal by condensation on water spray droplets could be extremely high. Scrubbing experiments were carried out on the hot gas/tar stream evolved from the simulated devolatilization section of a laboratory fixed bed gasifier. The combined overall collection efficiency for a mixed particulates and vapor stream compares satisfactorily with the model predictions.