Heavy fuel oil C composition
[Problem to be Solved] It is an object to provide a C-type heavy fuel oil composition that is excellent in lubricity, has excellent low-temperature fluidity, ignitability and heating value and is excellent in fuel sealing properties even if the sulfur content is low. [Solution] A C-type heavy fuel oil composition includes a sulfur content of 0.100 mass % or lower, and 5 to 400 mass ppm on a sulfur basis of a sulfur compound having a boiling point of no lower than a boiling point of dibenzothiophene. The composition has a density (15° C.) of 0.8700 to 0.9400 g/cm 3 , a kinematic viscosity (50° C.) of 3.500 to 25.000 mm 2 /s, a pour point of no higher than 25.0° C., a flash point of at least 70.0° C., and a gross heating value of at least 39,000 J/L.
1. A C-type heavy fuel oil composition comprising:
a sulfur content of 0.100 mass % or lower,
5 to 400 mass ppm on a sulfur basis of a sulfur compound having a boiling point of no lower than a boiling point of dibenzothiophene, and
25.0 to 70.0 mass % of aromatics,
wherein the C-type heavy fuel oil composition has a density (15° C.) of 0.8700 to 0.9400 g/cm 3 , a kinematic viscosity (50° C.) of 3.500 to 25.000 mm 2 /s, a pour point of no higher than 25.0° C., a flash point of at least 70.0° C., and a gross heating value of at least 39,000 J/L.
2. The C-type heavy fuel oil composition according to claim 1 , comprising 10 vol % or more of an indirect desulfurization residual oil including a sulfur content of 0.100 mass % or less and 0.1 mass % or less of carbon residue, the indirect desulfurization residual oil having a density (15° C.) of 0.8700 to 0.9100 g/cm 3 , and a kinematic viscosity (50° C.) of 10.000 to 25.000 mm 2 /s.
3. The C-type heavy fuel oil composition according to claim 2 , comprising 5 to 70 vol % of a cracked gas oil including a sulfur content of 0.100 mass % or less,
wherein the C-heavy fuel oil composition includes 30 to 95 vol % of the indirect desulfurization residual oil.