Abstract:

An idea was proposed to use Fischer-Tropsch (F-T) diesel fuel blended together with alcohol fuel
coal based fuel, which have high cetane value and oxygen. The combustion and emission characteristic effect
was investigated for the Fischer-Tropsch (F-T) diesel adding 10% volume of methanol, ethanol and butanol
fuel on comparing with 0# diesel fuel. The results show that compared to the 0# diesel fuel, the ignition time
is advanced and the combustion heat release center CA50, means the crankshaft angle corresponding to
50% of the total heat release, is postponed. The first peak combustion heat release rate decreases. Premixed
combustion heat reduces. The other peak value increases and the diffusion combustion in proportion increases.
Coal based Fischer-Tropsch alcohol mixed fuel can reduce NOx, carbon smoke and formaldehyde emissions
and the same volume of methanol fuel has better effect on diesel engine emissions optimization, under external
characteristic.

Key words: diesel engine, Fischer-Tropsch (F-T) diesel fuel, alcohol fuels, combustion, emission