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Donough Shanahan
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The temperature is not the issue but the pressure required. 200 bar makes for a really expensive process. Not only will the equipment be very expensive but most of the energy will be consuumed by compressor electricity trying to get to and maintaining that pressure.
Indium and Yt are very rare with Indium predicted to be one of the first rare earths to become extremely expensive (c 2025). On one hand they seem to be aware of industrial needs (though sintering in air is not that important and less than 700 is well known) and on the other, completely clueless (no-one could suggest indium...). A shame.
Despite so called 'cost competitiveness' at this time or soon the IEA still suggest that solar will only account for 10% of world energy production in 2050. And how can they say that onshore wind already cost competitive while also saying that it needs storage to penetrate? If it does not penetrate, it is not cost competitive. Maybe they should read E.on's reports on wind energy.
What They are only finding that now. DISI has been commercial for years as has the knowledge that ethanol at higher compression could be more efficient. It is a no brainer to put the two together and say it could be more efficient.
Surely using black liquor is not very clever. While other sources may be available, most comes from the pulping industry where the liquor is then burned to make the mill almost self sustainable (after excess water is removed). In America alone this burning contributes more carbon neutral energy than solar, wind and geothermal combined.
Donough Shanahan is now following mmillikin
Sep 2, 2010
'Carbon capture and sequestation is easy' That is a false statement. CCS increases the cost of power from a power plant by at least 30%. If it were so easy I would expect far more industrial commercial operations.
There is nothing here to scale up as yet. They have indications as to where to go with further research. The title is somewhat misleading.
In what way; what is your basis. The petrochem industry has been looking at this for styrene production which is a gas phase reaction.
@ Engineer-Poet You know that is not a valid comparison. The financials of both processes are extremely different. Shell; hell most major oil companies has been working on micro-channel reactors since the 70's and have yet to produce a viable reactor. Do a patent search.
Except that you need an excessive amount of channels which in themselves will contain hot and cold spots. The generation of turbulence to avoid this leads to excessive compression or pumping requirements due to the large pressure drops involved. Not only that you have to get three variables (residence time; selectivity and yield) to go in sync despite for this reaction selectivity and yield have different requirements from residence time. And then you get back to manufacturing all those channels. If they can get the 4 times they say they can then maybe it is worthwhile but what they have disclosed is not enough.
@ healthybreeze the advantage there is that liquid biofuels have inbuilt storage whereas wind and solar electricity require significant infrastructural modifications i.e. increase of substations to account for diverse nature of supply; storage systems etc. When you take that into account figures closer to parity become apparent. Henry Gibson is correct and I will go one further; without first being more efficient it will be almost impossible to supply our current electricity demands as well as electrical transport at the same time. For the first time there is a large drive to increase efficiency so that this may be accomplished.
Is it worth it? Bagasse already provides a use in supplying much if not all of the energy requirements for the plant.
Algae fuels are still prohibitive expensive in both terms of cost and energy return on investment. That is why it is not included; the path is not there for them to compete.
SJC Higher alcohols would be insoluble in water and the extraction costs from the fermentation broth would be very cheap.
But the real important information is missing from the study; if air traffic is increasing then it is likely that land based traffic will also continue. Thus I would expect that the percentages would stay similar thus meaning that air traffic will be no more significant in the future than now. Even the worst case as the report puts out air traffic will still contribute less than 10% to emissions; comparible to deforestation.
Quite general; the phrase 'a little more weakly' is interesting. They have added an extra complex step or two (adding and then removing copper) for what, a supposed 80% reduction in platinum. Of course as we use so little platinum in the fuel cell, it is only one of a number of significant costs. An HD is correct the real costs are that of infrastructure.
Interesting figure for the subsidies. It does not agree with the figures used in the ethanol producer magazine 2009 who say subsidies for fossil fuels amounted to 72 billion over 7 years.
Donough Shanahan is now following The Typepad Team
Apr 22, 2010