POWER December 2016 - 45

COAL PLANT O&M
2. That's one small step for a man. A heavy concentration of pyrites (in yellow) in a
coal refuse pile triggered spontaneous combustion, coating the pile with lunar-white coal ash.
Other portions of the pile underwent significant self-heating, but without reaching combustion.
Courtesy: Una Nowling
ferred. Covered storage should utilize heat
and combustion sensors, as well as fire
and dust suppression systems, to allow
plant staff to prevent fires and explosions.
Pile rotation should be carefully tracked
and managed to prevent self-heating coal
from sitting for lengthy periods of time. This
will have the coincident benefits of reducing
moisture uptake (Figure 3) and excessive
dusting from weathering decomposition.
Managing Coal Piles for Minimal
Losses
occurring within the pile, concentrating
heat and leading to spontaneous combustion.
Recommendations for maximum
coal pile heights vary greatly, with most
recommending that stockpiles be no more
than 24 to 40 feet high.
■ Wind exposure should be kept to a minimum,
with covered storage being preCoal
heat content losses can vary tremendously
across different sites and types of
coal. A study in the United Kingdom found
that, with proper stockpile management,
high-rank bituminous coal lost only 0.65% of
its heat content over several years. Another
study found a low-rank subbituminous coal
can lose 1.5% of its heat content just between
the mine and the power station. A study of
low-rank coal in Brazil found stockpile heat
content losses of 5.6% over just 10 months.
One study I was involved in examined
the effect of oxidation losses to a 20,000-ton
pile of high-volatile PRB coal that had sat
for 29 months. The plant was astonished to
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POWER December 2016

Table of Contents for the Digital Edition of POWER December 2016

Contents
POWER December 2016 - Cover1
POWER December 2016 - Cover2
POWER December 2016 - Contents
POWER December 2016 - 2
POWER December 2016 - 3
POWER December 2016 - 4
POWER December 2016 - 5
POWER December 2016 - 6
POWER December 2016 - 7
POWER December 2016 - 8
POWER December 2016 - 9
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POWER December 2016 - 45
POWER December 2016 - 46
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POWER December 2016 - Cover3
POWER December 2016 - Cover4
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