POWER October 2013 - 1

Established 1882 * Vol. 157 * No. 10
October 2013
On the cOver
Duke Energy's Edwardsport integrated gasification combined cycle plant is one of this
year's coal-fired Top Plant Award winners. The cover image shows one of the two gasification
towers that produce syngas, which is burned in the combustion turbines. Courtesy:
Duke Energy
COVER STORY: COal-fiREd TOp planTS
28 Cliffside Steam Station Unit 6, Cliffside, north Carolina
Development of this supercritical plant entailed procuring an air permit from the
state that included a first-of-its-kind carbon mitigation plan. The new Cliffside unit
boasts some of the highest operating conditions in North America and is 23% more
efficient than the units it replaced.
32 Edwardsport Generating Station, Knox County, indiana
Despite a torturous path to completion that included cost overruns more often associated
with nuclear plants, Duke Energy's integrated gasification combined cycle
plant is a milestone in the development of next-generation coal power technology.
The plant's emissions, water use, waste generation, and gross thermal efficiency all
surpass what's possible at the best pulverized coal plant.
34 Mundra UMpp, Gujarat, india
India is going big with coal-fired capacity, and Mundra, the first of several planned
ultra-mega power projects (UMPPs), weighs in at 4 GW. The plant-which has already
won several awards for construction, design, and safety practices-also is the
first in India to use 800-MW supercritical boiler technology.
38 prairie State Energy Campus, Washington County, illinois
This 1,600-MW mine-mouth plant is the largest U.S. coal-fired plant to be built in
three decades. The supercritical plant's state-of-the-art emissions controls result in
emissions that are one-fifth the national average for coal-fueled plants.
40 Shentou Second power plant, Shuozhou City, Shanxi province, China
A 4 x 500-MW coal plant is setting an example for China and the world with an innovative
process that recycles its low-grade waste heat to produce hot water for central
heating. The solution has enabled the closure of smaller, more polluting facilities in a
nation trying to provide both cleaner air and more power for its people.
38
SpECial REpORT: COal-TO-GaS COnVERSiOnS
44 practical Considerations for Converting Boilers to Burn Gas
Refueling a boiler that originally burned coal or oil so it can burn natural gas impacts
the entire boiler gas path. Here's what you need to be aware of, from boiler modifications
to emissions issues.
48 Utility Options for leveraging natural Gas
Owners of coal-fired power stations that wish to balance their exposure to coal-fired
generation with additional natural gas-fired generation have several options to consider.
This article reviews the four most practical ones and offers three case studies
examining their economics.
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October 2013 | POWER
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POWER October 2013

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