Experimental and modeling studies lead to the design of better combustion devices.
For better burning, fuel should have more contact with the combustion chamber wall, so the surface of the combustion chamber walls should be minimized as possible; for this, the chamber should be of spherical shape but practically it is not possible [9, 10, 11].
Smaller particles results in better combustion performances.
For the presence of more air and more in-built oxygen of the biodiesel, better combustion takes place and emission of unburned HC reduces.
So, HC emission for combustion of biodiesel must be less than petro-diesel because of the presence of in-built oxygen which triggers better combustion of the former.
Higher pressure yields a finer mist, and that creates better combustion and far more efficient power.
Therefore, optimal design of combustion system is still necessary for better economic performance and stabilized combustion characteristic of the boiler.
Homogeneous charge compression ignition (HCCI) combustion is employed for better efficiency and reduced emissions, whereas spark ignition (SI) combustion can be used for quick start of the FPEG and higher power demand.
One process concept with a potential for better performance is chemical-looping combustion (CLC).
Thanks to the above information, it was decided to change the design of the burner stone (to reduce its length) for better mixing of steam and combustion products.
However, so far detailed investigations on spray combustion characteristics of hydrous ethanol diesel emulsified fuels are rarely reported, though this information is crucial in combustion system design for better application of these fuels in diesel engines.
