Cooled Coal Emissions Clean Air

Tuesday, August 28, 2012 @ 06:08 PM gHale


Refrigerating coal-plant emissions could reduce levels of dangerous chemicals that pour into the air — including carbon dioxide by more than 90 percent.

Just look at the math, said University of Oregon physicists.

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By using a simple math-driven formula the scientists said the “energy penalty” would raise electricity costs by about a quarter, but also reap huge societal benefits through subsequent reductions of health-care and climate-change costs associated with burning coal. An energy penalty is the reduction of electricity available for sale to consumers if plants used the same amounts of coal to maintain electrical output while using a cryogenic cleanup.

“The cryogenic treatment of flue gasses from pulverized coal plant is possible, and I think affordable, especially with respect to the total societal costs of burning coal,” said Oregon Physicist Russell J. Donnelly.

“In the U.S., we have about 1,400 electric-generating units powered by coal, operated at about 600 power plants,” Donnelly said. That energy, he added, sells at about 5.6 cents per kilowatt-hour, according to a 2006 Congressional Budget Office estimate. “The estimated health costs of burning coal in the U.S. are in the range of $150 billion to $380 billion, including 18,000-46,000 premature deaths, 540,000 asthma attacks, 13,000 emergency room visits and two million missed work or school days each year.”

In their separate economic analysis, Donnelly and Oregon Research Assistant Robert E. Hershberger, also a co-author of a paper on the subject, estimate implementing large-scale cryogenic systems into coal-fired plants would reduce overall costs to society by 38 percent through the sharp reduction of associated health-care and climate-change costs. Not in the equation, Donnelly said, are the front-end health-care costs involved in coal extraction through mining.

The cryogenic concept is not new. Donnelly experimented briefly in the 1960s with a paper mill in Springfield, OR, to successfully remove odor-causing gasses filling the area around the plant using cryogenics. Subsequently the National Science Foundation funded a major study to capture sulfur dioxide emissions — a contributor to acid rain — from coal burning plants. The grant included a detailed engineering study by Bechtel Corp. of San Francisco.

The Bechtel study showed the cryogenic process would work very well, but noted large quantities of carbon dioxide also end up condensed, a consequence that raised no concerns in 1978. “Today we recognize that carbon dioxide emissions are a leading contributor to climate-warming factors attributed to humans,” Donnelly said.

Out came his previously published work on this concept, followed by a rigorous two-year project to recheck and update his thermodynamic calculations and compose “a spreadsheet-accessible” formula for potential use by industry. His earlier work on the cryogenic treatment of coal-plant emissions and natural gas sources had sparked widespread interest internationally.

While the required cooling machinery would be large — potentially the size of a football stadium — the cost for construction or retrofitting likely would not be dramatically larger than present systems that include scrubbers, which would no longer be necessary, Donnelly said. The paper does not address construction costs or the disposal of the captured pollutants, the latter of which would be dependent on engineering and perhaps geological considerations.

The process would capture carbon dioxide in its solid phase, then warm and compress it into a gas that could move via pipeline at near ambient temperatures to dedicated storage facilities that could be hundreds of miles away. Other chemicals such as sulfur dioxide, some nitrogen oxides and mercury could also undergo the condensation process and safely remove that from the exhaust stream as well.

Last December the U.S. Environmental Protection Agency issued new mercury and air toxic standards (MATS), calling for the trapping of 41 percent of sulfur dioxide and 90 percent of mercury emissions. A cryogenic system would do better based on the conservatively produced computations by Donnelly’s team — capturing at least 98 percent of sulfur dioxide, virtually 100 percent of mercury and, in addition, 90 percent of carbon dioxide.

“This forward-thinking formula and the preliminary analysis by these researchers offer some exciting possibilities for the electric power industry that could ultimately benefit human health and the environment,” said Kimberly Andrews Espy, Oregon vice president for research and innovation.



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