Photos Very Hot Torch
For more of our series "The Wide Angle," click around in the box to your right: "Get the Wide Angle on Plasma." Dec. 15, 2008 -- Plans to generate power and eliminate landfill waste by ripping trash apart at the molecular level in Florida and California are running into steep hurdles from local opponents. The initial proposal in Florida, which has since been scaled back by about 80 percent, would have created the largest plasma arc gasification plant in the world. The proposed plant in Sacramento has been set back by a lack of financial details about just how much electricity would be produced and how much trash would be gasified by plasma. Plasma is a gas that has been partially ionized, meaning that some of the electrons roam freely, giving it unique electromagnetic properties that make it the fourth state of matter. On Earth we are surrounded by the other three states, solids, liquids and gases, but most of the visible universe is made up of plasmas, found inside various stars. NASA initially harnessed the power of plasma in the 1960's to ensure that spacecraft entering the Earth's atmosphere didn't burn up. Steel manufacturers used the technology to slice up steel. About 20 years ago other groups realized the high temperatures could gasify, not incinerate, just about any material. Related Content: The Wide Angle Slide Show: Plasma, Plasma Everywhere The Wide Angle: Facts About Zapping Trash with Plasma The Wide Angle: Physicians Oppose Plasma Plant Incinerators need oxygen to burn fuel at a relatively low temperature. Gasification, as its proponents are quick to point out, needs very little, if any, oxygen for the reaction. Incineration is a more of a chemical reaction that releases much of the energy inside a fuel. The best analogy to what happens, says Lou Circeo, a professor at Georgia Tech who helped develop plasma arc technology decades ago, is what happens inside a bolt of lightening. "Take about two to three feet of a lightening bolt and attach it to one of these arcs, and this will melt or gasify just about any material," said Circeo. To gasify trash, gas is expelled from a torch at temperatures hotter than the surface of the sun, higher than 10,000 degrees Fahrenheit. The gas, which is technically plasma, rips matter apart physically and reforms it into two products, a gas and a solid. The solid slag can be ground up and used as filler material in construction projects. The resulting gas, a mix of carbon monoxide and hydrogen called synthesis gas or syngas, can then be burned to produce electricity or turned into various petroleum products. "The greatest benefit of gasification is the ability to recover more usable energy out of the waste material," said Mark Montemurro, CEO of Alter NRG, which holds the licence to the technology that would be used for the California plant. "It's twice as efficient as combustion." Get More NewsMouse Cloned From Long-Frozen CellResearchers create a mouse from a long-frozen cell. Will the mammoth be next?'Bubble' Could Protect AstronautsScientists say a "bubble" around a Mars-bound spaceship could protect astronauts.Big Reduction of Snowmobiles in Yellowstone ProposedA new plan would cut snowmobile use by 40 percent in Yellowstone.Microbes: Fuel of the Future?A reddish South American microbe is literally breathing fuel, say scientists.DNA Links Remains to Steve FossetDNA tests on two bones found in California confirm they are those of Steve Fossett.Women Carry More Bacteria Than MenSome bacteria prefer women, suggests a new study. But why?Ancient 'Water Monster' Facing ExtinctionA foot-long salamander that was a key part of Aztec legend is threatened by extinction.Grand Canyon's Youth ConfirmedThe Grand Canyon is millions of years younger than previously thought, argue geologists.My Take: E-Voting Not User FriendlyOpinion: Electronic voting machines don't always capture the intent of voters.SLIDE SHOW: Landscapes of TerrorWhat makes a place feel scary? There are scientific explanations.At 40, Brain and Body SlowThe part of the brain in charge of motion starts a gradual slide in middle age.Spiders, Scorpions Among World's Oldest CreaturesMany creepy crawlies have been on Earth much longer than previously believed.Blood-Sucking Vampire Bats Sing DuetsWhite-winged vampire bats "harmonize" with separated roost mates. |
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