CNG, or compressed natural gas, is made by compressing methane gas and storing it in hard cylinders at high pressure. It is a cheaper substitute for diesel, petrol, and propane. CNG produces less carbon emissions than these fossil fuels and has several advantages, such as lower maintenance costs and reduced pollution. However, it requires more storage space in vehicles. Despite this disadvantage, CNG has grown popular due to its environmental and economic benefits and over 14 million natural gas vehicles worldwide use CNG as of 2011.
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Cng ppt
1. CNG –compressed natural gas
It is substitute fossil fuel for
DIESEL,PETROL,PROPANE
4. PREPARATION
It is made by compressing the natural gas
(composed of methane) to less than 1% of
the volume at stnd. atmospheric pressure. It
is stored in hard cylindrical containers at a
pressure of 200-280 bars.
5. IMPORTANCE
It is cheap than other fuels
It is dispersed quickly when released
It is lighter than air
It releases less carbon into the atm.
7. ADVANTAGES
Due to absence of LEAD or BENGENE , lead
fouling of spark plugs is eliminated.
Low maintenance cost than other vehicles
Increases the life of lubricating oils
It mixes easily and evenly in air
It is less likely ignite on hot surfaces, bcz it has
a high auto ignition temp.(540˚c), and small
range of flammability (5%-15%).
Less pollution and more efficiency.
8. CNG CARS
In cars Several manufacturers (Fiat, Opel
(General Motors), Peugeot, Volkswagen,
Toyota, Honda and others) sell bi-fuel cars.
In 2006, “Fiat” introduced the “Siena” Tetra
fuel car in the Brazilian market , equipped
with a 1.4L FIRE engine that runs on E100,
E25 (Standard Brazilian Gasoline), Gasoline
and CNG.
9. CNG LOCOMOTIVES
“The Napa Valley Wine Train” successfully
retrofit a diesel locomotive to run on
compressed natural gas before 2002. it’s first
locomotive
“Ferrocarril Central Andino” in Peru, has run
a CNG Locomotive on a freight line since
2005.
10. CNG BIKES
Argentinian company Zanella has launched a
CNG powered bike. This is the first bike in the
world to come with a factory fitted CNG power.
in India Bajaj Auto has recently launched its first
CNG motorcycle “Bajaj RE CNG Auto 4 stroke”.
12. TOP TEN COUNTRIES WITH MOST CNG
VEHICLES-2011
country No. of vehicles in millions
Iran 2.86
Pakistan 2.85
Argentina 2.07
Brazil 1.7
India 1.1
Italy 0.78
China 0.61
Colombia 0.36
Uzbekistan 0.31
Thailand 0.30
World Total 14.8
13. EXAMPLE
An engine running on petrol for 100 km emits
22,000 grams of CO2, for same distance on
CNG emits only 16,275 grams of CO2. CNG
is essentially CH4 with a c.v. of 900 kJ/mol. It
burns with oxygen to produce 1 mole of CO2
and 2 moles of H2O. By comparison, petrol is
essentially C6H6 with a c.v. of 3,300 kJ/mol
and this burns to produce 6 moles of CO2
and 3 moles of H2O. So it gives less pollution
.
15. DISADVANTAGES
CNG vehicles requires greater amount of
space for fuel storage than conventional
gasoline powered vehicles . Since it is a
compressed gas, rather than a liquid like
gasoline, CNG takes up more space for each
gasoline gallon equivalent(GGE).
16. SOLUTIONS
Install the tanks under the body of the
vehicle, leaving the trunk free
Eg. Fiat multipla, Volkswagen Touran
Ecofuel,
Volkswagen Caddy Ecofuel.
Installation of tanks on the roof (typical on
buses).
17. EFFECTS
CNG emits significantly less pollutants
than petrol such as
Carbon dioxide (CO2),
Unburned hydrocarbons (UHC),
Carbon monoxide (CO),
Nitrogen oxides (NOx),
And sulfur oxides(SOx) ,
18. COMPARISON WITH LNG
CNG LNG
CNG is stored at high LNG is stored at very low
pressure as a gas. temperature as a liquid.
It has lower cost of It has higher cost of
production storage production and storage
CNG requires a much
larger volume to store the LNG is often used for
same mass of gasoline or transporting natural gas
petrol and the use of very over large distances, in
high pressures nearly ships, trains or pipelines,
3000 to 4000 psi, (or) 205 and the gas is then
to 275 bar. converted into CNG.
19. COMPARISON WITH HCNG
The addition of hydrogen to CNG increases
the H/C ratio of the fuel. HCNG has a flame
speed about eight times higher than CNG.
20. CONCLUSION
Due to this above reasons CNG most useful
for vehicles as a fuel to reduce the pollution
and it is cheap than other fuels like petrol
and diesel.