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Renewable Energy 5 Coal
Coal
15
Engineering
Undergraduate 1
10/25/2009

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Cards

Term
Coal is the plants and trees
that died partly decomposed in the
absence of what and when?
Definition
the absence of oxygen and bacteria in
swamp waters between 200 and 300 million
years ago
Term
Coal has been used as a fuel for at least (how long)
Definition
A few thousand years
Term
Anthracite is coal with what carbon content?
Definition
The highest, between 86 and 98 percent, and a heat value of nearly 15,000 BTUs-per-pound
Term
Bituminous coal has a carbon content
ranging from
Definition
45 to 86 percent carbon and a
heat value of 10,500 to 15,500 BTUs-perpound.
Term
Sub bituminous coal has a carbon content of
Definition
35-45 percent carbon content and a heat value between
8,300 and 13,000 BTUs-per-pound.
Term
Lignite is coal which has a carbon content of
Definition
25-35
percent, and a heat value ranging between 4,000 and 8,300 BTUs-per-pound.
Term
How many Megatonnes of Coal is produced yearly worldwide?
Definition
Nearly 5000 Mt
Term
The US has the largest reserves, what percentage of overall coal is it?
Definition
24% overall
Term
The US and China are the top two coal producers at which percentage of the total?
Definition
US - 26%
China 23%
Term
How much of the US's primary energy does coal provide?
Definition
Less than a quarter
Term
How much primary energy does coal provide for China?
Definition
More than two-thirds
Term
What is the average heat value for hard coal?
Definition
28 GJ per tonne
Term
What is the average heat value for brown coal or lignite?
Definition
14 GJ per tonne
Term
One million tonnes of coal equivalent (1 Mtce) is (in PJ)
Definition
28 PJ
Term
What is the electricity conversion efficiency of coal on average?
Definition
About 33%, up to 70% for clean coal technology
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