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About 9% of Australias energy comes from renewable sources.

1. It comes from energy released by radioactive substances deep within the Earth2. Heat warms up the Earth's surface

3. Water is pumped down the pipe towards the heated rock

4. The water evaporates and turns into steam

5. The steam goes up another pipe in high pressure which leads to the generator

6. The steam rotates the generator creating electricity

We can build geothermal power stations in volcanic areas or where there are hot rocks deep below thesurface. Water gets pumped down to these rocks to produce steam. Then the steam produced drivesturbines at ground level.

Read more:http://wiki.answers.com/Q/How_does_geothermal_electricity_work#ixzz1VN38RRmb

Steam reforming

Fossil fuel currently is the main source of hydrogen production.[3]

Hydrogen can be generated

fromnatural gaswith approximately 80% efficiency, or from otherhydrocarbonsto a varying

degree of efficiency. Specifically, bulk hydrogen is usually produced by thesteam reforming

of methane or natural gas[4]

At high temperatures (7001100 C), steam (H2O) reacts with

methane(CH4) to yieldsyngas.

CH4 + H2O CO + 3 H2 + 191.7 kJ/mol[5]

Gasification

In a second stage, further hydrogen is generated through the lower-temperaturewater gasshift reaction, performed at about 130 C:

CO + H2O CO2 + H2 - 40.4 kJ/mol

Essentially, theoxygen(O) atom is stripped from the additional water (steam) to

oxidize CO to CO2. This oxidation also provides energy to maintain the reaction.

Additional heat required to drive the process is generally supplied by burning some

portion of the methane.

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8/2/2019 Alex Geothermal

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Steam reforming generatescarbon dioxide(CO2). Since the production is

concentrated in one facility, it is possible to separate the CO2 and dispose of it

properly, for example by injecting it in an oil or gas reservoir (seecarbon capture),

although this is not currently done in most cases. A carbon dioxide injection project

has been started by aNorwegiancompanyStatoilHydroin theNorth Sea, at the

Sleipner field. This is disputed inThe Hype about Hydrogen: Fact and Fiction in theRace to Save the Climate, a book byJoseph J. Romm, published in 2004 by Island

Press and updated in 2005. Romm says that directly burning fossil fuels generates

less CO2 than hydrogen production.[citation needed]

Integrated steam reforming /co-generation- It is possible to combine steam

reforming andco-generationofsteamandpowerinto a single plant. This can deliver

benefits for anoil refinerybecause it is more efficient than separatehydrogen,steam

andpowerplants.Air Productsrecently built an integrated steam reforming /co-

generationplant inPort Arthur, Texas.[6]

[edit] Partial oxidation

Thepartial oxidationreaction occurs when asubstoichiometricfuel-air mixture is

partiallycombustedin a reformer, creating a hydrogen-richsyngas. A distinction is

made between thermal partial oxidation (TPOX) and catalytic partial oxidation

(CPOX).

General reaction equation: Possible reaction equation (heating oil): Possible reaction equation (coal):

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