By Sunil C.
Perera
Sri Lankans are now engaged to defeat the fuel price
increase, while two local fuel distributors increase their fuel
prices regularly.
However, local researchers say using of alcohol would
minimize fuel cost, but motorists fear to use these new fuel
varieties. Recently the government has introduced alcohol mixed
fuel to run three wheelers, but three wheeler drivers say it
will reduces their engine’s life span.
Meanwhile worlds leading auto manufacturers use fuel cell
concept to run vehicles. A number of auto giants say that they
could switch on their new fuel cell vehicles without any
trouble.
Chairman Sugarcane Research Institute Dr.C.S.Weeraratne said
Sri Lanka should adopt alternative power and energy resources to
reduce fuel imports.
According to the leading auto manufacturers, a fuel cell is
an electrochemical device that combines hydrogen and oxygen to
produce electricity, with water and heat as its by-product.
`A0As long as fuel is supplied, the fuel cell will continue to
generate power. `A0Since the conversion of the fuel to energy
takes place via an electrochemical process, not combustion, the
process is clean, quiet and highly efficient - two to three
times more efficient than fuel burning.
No other energy generation technology offers the combination
of benefits that fuel cells do. `A0In addition to low or zero
emissions, benefits include high efficiency and reliability,
multi-fuel capability, sitting flexibility, durability, sand
ease of maintenance.
Fuel cells are also scalable and can be stacked until the
desired power output is reached. `A0Since fuel cells operate
silently, they reduce noise pollution as well as air pollution
and the waste heat from a fuel cell can be used to provide hot
water or space heating for a home or office.
In principle, a fuel cell operates like a battery. Unlike a
battery, a fuel cell does not run down or require recharging. It
will produce energy in the form of electricity and heat as long
as fuel is supplied. A fuel cell consists of two electrodes
sandwiched around an electrolyte. Oxygen passes over one
electrode and hydrogen over the other, generating electricity,
water and heat. Hydrogen fuel is fed into the "anode" of the
fuel cell. Oxygen (or air) enters the fuel cell through the
cathode. Encouraged by a catalyst, the hydrogen atom splits into
a proton and an electron, which take different paths to the
cathode. The proton passes through the electrolyte. The
electrons create a separate current that can be utilized before
they return to the cathode, to be reunited with the hydrogen and
oxygen in a molecule of water.
A fuel cell system which includes a "fuel reformer" can
utilize the hydrogen from any hydrocarbon fuel - from natural
gas to methanol, and even gasoline. Since the fuel cell relies
on chemistry and not combustion, emissions from this type of a
system would still be much smaller than emissions from the
cleanest fuel combustion processes.
The Energy research Centre of the Netherlands (ECN) in Petten
has built the first car to be powered by a Dutch fuel cell
system. The key component, the PEM fuel cell stack, has been
developed entirely in Petten. The car itself is a modified
version of an existing electric service vehicle, the
DaimlerChrysler GEM. The standard GEM is powered by a traction
battery, the capacity of which restricts the car’s operating
range and necessitates regular and lengthy recharging from the
mains.
But the new version developed by ECN and christened the
HydroGEM has a far greater range and can be refuelled quickly.
The fuel cell produces sufficient power to supply electricity to
utensils such as electric tools as well. The HydroGEM is quiet
and extremely clean, making it suitable for use at airports,
railway stations, distribution centres and other industrial
locations, not to mention on nature reserves and even in
hospitals.
According to Frank de Bruijn, unit manager Hydrogen & Clean
Fossil Fuels, the main purpose of the HydroGEM at this stage is
to investigate how the fuel cell technology developed at ECN
performs in practice. "Our own General Services Department
starts using the HydroGEM this autumn," he explains, "making it
the first Dutch hydrogen vehicle to enter operational service."
Compared with battery-powered vehicles, the HydroGEM has a
considerably wider operating range. Lengthy recharging periods
are also a thing of the past. Refuelling with hydrogen takes no
more than ten minutes. The vehicle has an electronically limited
maximum speed of 40kph and a payload of up to 400kg. The
propulsion system developed by ECN consists of a 5kWe fuel cell,
which is used in combination with the original 6.5kWh battery
pack. The hydrogen is stored in a 76-litre tank at a pressure of
200 bar. That is sufficient fuel to enlarge its range to at
least 200km.