Fuel oil is a type of refined oil. It is one of the heavier 

residual products from the refining of crude oil, after 

lighter components such as gasoline, kerosene, and 

diesel are first separated. Primarily the residue from 

the cracking and straight-run distillation of crude oil, 

fuel oil is characterized by its high viscosity as well as 

the significant amount of non-hydrocarbon compounds, 

resins, and asphaltenes. Fuel oil is principally used in 

oil refining and chemical, transport, construction, and 

metallurgy industries. In recent years, the consumption 

of fuel oil by boilers and power generation has dropped 

sharply, whereas the demand in the marine fuel market 

is rising steadily

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