Bi-fuel (NG+D) gensets are powered by a compression-ignited
diesel engine that runs on the simultaneous combustion of diesel
fuel and natural gas. Under normal operating conditions, bi-fuel
gensets up to 800 kW can operate on 70% natural gas and 30% diesel
fuel; larger gensets typically achieve a 50/50 mix.
After installing a bi-fuel conversion kit, a diesel engine
is able to operate either on 100% diesel fuel, or on a mixture of
diesel fuel and natural gas or other methane-based fuel.
Bi-fuel Technology Advantages
Lower Operating Cost
If the cost of diesel fuel is significantly higher than the
cost of an equivalent quantity of natural gas, significant
savings could result. In addition to saving on fuel, saving on
engine maintenance may also help control your operating costs.
Lower Capital Investment per Kilowatt.
Natural gas generators typically cost up to twice as much as
comparable diesel units. With bi-fuel conversion, you get the power
of diesel and most of the benefits of natural gas operation for a
price that is competitive with a diesel-only unit.
Bi-fuel generators emit about 30% less nitrogen oxides and 50%
less particulate matter than comparably sized diesel-only
Increased Fuel Efficiency
For each gallon of diesel fuel displaced during bi-fuel operation,
an "equivalent gallon" of natural gas is consumed, resulting in the
same net fuel burn vs. load as 100% diesel operation,
and similar engine fuel efficiencies (based on 129,000
btu/gallon # 2 diesel vs. 930 btu/scf natural gas.)