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SILICON
SILIC
CHIP
www.siliconchip.com.au
Publisher & Editor-in-Chief
Leo Simpson, B.Bus., FAICD
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2 Silicon Chip
Publisher’s Letter
Natural gas means
geosequestration is unnecessary
My “Publisher’s Letter” last month poured scorn
on “carbon pollution” and geosequestration, which
is now known as “Carbon Capture & Storage Technology”. As you might expect, there has been significant
criticism of that viewpoint but considerable support
as well.
Coincidentally, David Knox, CEO of Santos, has
put the case for using natural gas to fire Australia’s
thermal power stations, some 80% of which are currently coal-fired.
As he points out, “if we are serious about confronting climate change, and
if we are to deliver the Government’s target of a 60 percent reduction in carbon emission by 2050, we need to reduce the carbon intensity of Australia’s
baseload power generation”. He goes on to state “that gas fired power technology (known as combined cycle or CCGT) emits only 40 percent of the carbon
emissions of the existing” average coal-fired power station. In fact, it already
delivers 80 percent of the carbon reduction hoped for from geosequestration.
Now David Knox could be dismissed as simply selling his wares but he is
nonetheless correct. He also highlights the peak load ability (as well as base
load) of gas-fired stations and their greatly reduced use of water compared to
coal-fired stations. In fact, a gas-fired power station only uses 1% of the water
required for a coal-fired station. I am not referring to the water required for
cooling but to the water required for coal scrubbing.
He could have added that the extraction of natural gas causes none of the
problems of damage to water resources by coal mining. Nor does it cause
subsidence as in the case of long-wall mining or have the need for extremely
costly landscape remediation, as in the case of open-cut mining.
Nor does a gas-fired station produce huge quantities of ash which must
also be disposed of. The more you think about it, using Australia’s massive
gas deposits for electricity generation is a very good idea.
You can read the full text of the Santos submission to the Australian Government’s energy white paper process on the Santos website at http://www.
santos.com/Archive/NewsDetail.aspx?p=121&id=1145
Not only is using natural gas for power stations more environmentally
friendly, it is thermodynamically much more efficient, particularly when
employed in “combined cycle”. This is where the hot exhaust from the gas
turbines is used to generate steam and run a turbo-alternator. The net result
is that gas-fired power stations not only emit less carbon dioxide than coalfired stations, they produce far less emissions than would be produced with
a coal-fired power station which was using some sort of (yet to be proven)
carbon capture and storage system.
So rather than introducing an elaborate and expensive emissions trading
scheme (ETS), the government should be seriously contemplating converting Australia’s existing coal-fired power stations to gas. And if it cannot do it
for the black coal stations, it should certainly do it for the brown coal power
stations in Victoria. Admittedly the conversion process will be expensive
but it will be much cheaper and easier to implement than the proposed ETS.
Furthermore, it could be done easily over the next 10 years or so.
Leo Simpson
siliconchip.com.au
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