Single COM Droplet Combustion by Self-Ignition

• Published in: Journal of the Fuel Society of Japan Vol. 59; no. 10; pp. 822 - 832
• Main Authors: SAITO, Masahiro, SAKAI, Takeshi
• Format: Journal Article
• Language: Japanese
• Published: THE JAPAN INSTITUTE OF ENERGY 20.10.1980
• ISSN: 0369-3775; 2185-226X
• DOI: 10.3775/jie.59.10_822

Combustion behaviour and characteristics of a COM (Coal-Oil Mixture) droplet were investigated experimentally.A single COM droplet was suspended at the end of a fine Pt-Pt·Rh thermocouple and ignited spontaneously (selfignition). The results showed that the combustion of COM differed from that of volatile fuels.The burning process was classified into the following two steps: (1) the gasification combus-tion of volatile matter, and (2) the solid combustion of residual carbon. The duration time of solid combustion was several times as long as that of gasifica-tion and it occupied a major part of the over-all combustion process. It was found that the coefficient of over-all burnig rate for a COM droplet was about one half to one third that of heavy fueloils.From the results, it is estimated that the combus-tionperformance of COM spray will be reduced, compared with the actual heavy fuel oil combustion, when the same size droplets are burned.