Combustion Characteristics of Soot Attached and Deposited on the Solid Body

Abstract

The flame-spreading phenomenon of combustible soot deposited on the flat plate is one of the basic problems in fire research. The study of the mechanism of burning of the soot deposited on the flat plate and glass wool was done. Therefore, in order to elucidate the soot fire mechanism, it is very important to measure the dissipation rate and luminous intensities profiles of soots. The experimental samples were taken out of the soot formed from various fuel oils and the soot emitted from various combustors. The value of chemical analysis of all the samples was checked quantitively, in advance of the experiments.
The main results obtained are as follows:
(1) The values of C/H and C/O in the soot formed decrease as the quality of fuel oil deteriorates.
(2) The C/H value of soots after washing by water (Exhaust gas economizer) is relatively smaller compared with that before washing in water. The chemical reaction rate increases in accordance with the decrease of C/H value.
(3) The cumbustion rate and Surface 1st damköhler number of the soot deposited increase as C/H value decreases.
(4) The burning period of the soot becomes shorter as the thickness of attaching plate for soot becomes smaller.
(5) The combustion rate rises the more acceleratedly because of the catalyzing reaction as the content of alkali or alkaline earth metals is higher.