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Published: Sunday 28 July, 2013

carhartt outlet carhartt outlet ?Ethanol Efficiency Redux



Renewable Energy Access has a recent article, Setting the Record Straight on Ethanol advocating the efficiency of ethanol. The article is written by Nathen Glasgow and Lena Hansen of the Rocky Mountain Institute who point out that enzymes now permit ethanol to be made from any cellulosic feedstocks and the advantages of this technology growth on marginal land, higher energy yield per acre, and less energy input by the farmers because the crops are perennials. Department of Energy data which indicates that for every one unit of energy available at the fuel pump, 1.23 units of fossil energy are used to produce gasoline, 0.74 of fossil energy are used to produce cornbased ethanol, and only 0.2 units of fossil energy are used to produce cellulosic ethanol. The first commercialscale enzymatic reduction hydrolysis plant is scheduled to be built and operational by Iogen within two years, producing ethanol at a targeted cost of $1.30 per gallon. They also have to take a swipe at Dr. Pimentel for his most recent attempt at rebuking ethanol.



Its worth a read by anyone who hasnt made up their mind on the energy efficiency of ethanol.



I know two planned ethanol plants that have cancelled proposed sites because of problems getting natural gas. Why would they need natural gas if corn ethanol produces more energy than it uses?



Wouldn a savvy ethanol plant operator who actually believed he or she was creating more energy than the plant was burning, simply divert a portion of the finished ethanol spewing forth from the out pipe and use that to run the plant instead of natural gas?



The answer is that corn ethanol does have a positive net energy balance, but most of that excess energy is locked up in a nonfuel form dry distillers grains that few except livestock farmers can make very good use of.



On a microscale DDG can be fed to cattle, but if corn ethanol was ever to go large scale in an attempt to replace gasoline completely, ethanol plants would be surrouned by piles and piles of DDG that few would want, could use, or could afford to haul away. The heaps of DDG piled around corn ethanol plants would look like the huge slag heaps around old coal mines.



Ethanol plants might have to burn the DDG as their source of thermal energy just to get rid of the stuff. One pound of DDG from corn has a btu vaule of 9600.



Gary, I think you missed one of the main points of my post Cellulosic ethanol is very energy efficient, requiring much less energy than current plants that burn large amounts of natural gas. One reason that current plants don use part of their product for energy is that they are producing a liquid fuel which, until recently, has been more in demand than natural gas. Panda Energy has built 3, of a planned 5, ethanol plants using menthane produced in a dedicated waste digestor rather than using natural gas. They have determined that it is bett carhartt outlet er to use the methane in ethanol production rather than producing electricity with it.



I believe BRI Energy is the name of the company using gasification that HFT was refering to.



DOE has an active development program for advanced processes that requires four demonstration plants to be built. All of these technologies have been decribed in previous posts and can be found in the biofuels category.



The discussions about using the cellulosic methodology to produce ethanol, is pure and simply just academic, as long as that process is not being used anywhere to produce e carhartt outlet thanol. If that process is so efficient, than why isn some really resourceful company making tons of money putting that technology to work making ethanol? Am I missing something here? Why do all the recent ethano carhartt outlet l plants built, and being built, all use corn as a feedstock, when it is the cellulose that everyone touts as being so efficient? The article above does not set the record straight, it just further muddies the water. As long as corn is the primary feedstock for ethanol production, then arguements about cellulosic production are meaningless.



Energy Information Administration EIA Annual Energy Outlook with Projections to 2030This Week In Petroleum. carhartt outlet

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