Furnace
oil is a dark viscous residual product used as a fuel in different types of combustion
equipment. It conforms to IS:1593-1988 for fuel oils. Presently MV-2 grade (kinematic
viscosity range of 125 to 180 cSt at 50°C) conforming to this specification
is being marketed. Broadly its applications can be classified as:
a)
Steam
Raising
In
the process industry and thermal power stations.
b)
Industrial
Furnaces
Metallurgical
furnaces, pottery and brick kilns, glass furnaces etc.
c)
Special
Applications
In
marine engines and slow speed engines for power generation.
For
drying tea leaves
In gas turbines for power generation
As
a feed stock for fertiliser manufacturing
In thermic fluid heaters and
hot air generators
While
FO is used in the DG sets there is no evaluating property like Cetane number or
CII. Instead of that, calculated carbon aromaticity index or CCAI is calculated
to find out the suitability. It is based on density and viscosity of the fuel.
Normally a value between 800 to 860 means good fuel for DG sets while values more
than 860 severe indicate unsuitability which may cause engine damage. Lower values
than 800 may not be very good but are not as bad as those beyond 860.