SYNOPSIS: -The author describes several problems on the combustion of heavy oil from results of his studies and some references. The items reviewed are as follows:
1) The combustion velocity and growing heat in the heavy oil combustion.
2) The influences of fuel's properties upon the spray size of fuel and the deposition of carbon.
3) The microgram quantity of contents in fuel as catalyst in the heavy oil combustion.
4) The corrosion by vanadium and sulfer in fael.