Mechanisms governing fine particulate emissions from coal flames Page: 4 of 18
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The overall objectives of this project are to provide a basic
understanding of the principal processes that govern fine particulate
formation in pulverized coal flames. This understanding is to be used to
develop a model (or models) which will predict the yield and size
distribution of fine particulate as a function of coal type, coal processing,
and combustion conditions. The goal of the model is to provide an
engineering tool that will enable the practitioner to estimate the
consequences of design decisions and fuel selection on the fine particulate
yield. The practitioner can then make rational decisions regarding the
required technology and costs associated with effluent cleanup while still in
the design phase.
Long term work is presently supported by PETC that will develop detailed
models of the entire mineral transformation process. The present work is
directed toward global models of behavior which will become available on a
shorter timeframe, and will be immediately usable in engineering activities.
Another goal of the work is to extend the capabilities for the
characterization of fine particulate. Present technology for characterizing
size distributions usually involves manual impactor techniques for sizes down
to 0.2 m. The EAA analyzer is used for aerosols. Although the impactor
covers the size range of interest, it is a very time consuming procedure.
Another difficulty is that the impactor and EAA overlap only over a small
size band. The results of the comparison of the two techniques are not
always consistent within the region of overlap. The goal is a single
instrument that will characterize the fine particulate size band rapidly and
Particles in the 0.5-10.0 jym size band are of interest for several
reasons. First, a considerable portion of the flyash generated in pulverized
coal combustion falls within this size range. Particulate control devices,
in particular electrostatic precipitators, are at their least efficient in
this size band. Also, particles in this size range are most efficiently
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Kramlich, J.C.; Newton, G.H.; Socha, R.G. & Clark, W.D. Mechanisms governing fine particulate emissions from coal flames, report, February 1, 1989; United States. (https://digital.library.unt.edu/ark:/67531/metadc1052408/m1/4/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.