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.
5
FUTURE ASPECT OF CFB BOILER
Long term operating experiences of CFB boiler has proven that it
has
very bright future and able to replace PC boiler completely in
economically
and environmentally acceptable manner.
Countries like USA having approximately 50% of their boiler
is
CFBC and other European countries have also good amount of CFBC
boiler
Fig. 1. Worldwide sale of CFB boilers by country. Percentages
are calculated based
on number of the installed units in each country (Grace et al.
1997).
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Even in Asia our neighbor country china has surprisingly 80% of
their boiler
is CFBC as shown below:
In India various countries are evolved in manufacturing of CFBC
boiler such
as:
BHEL-Lurgi collaboration
THERMAX
Alstorm
Foster Wheeler
Thomson etc.
Future of CFBC Boiler:
5.1 Supercritical CFB Boiler:
Supercritical CFB boilers ranging from 450MW(e) to 600MW(e) are
already
in constructions stage.
So in future even larger MW CFB Based unit can be seen.
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5.2 Stringent Environmental Rules:
Today environment is a major concern in all countries around
the
world and TPS are major source of dumping pollutants (like SOx,
Nox, CO
etc.) in environment.
And use of FGD/SCR/SNCR system is very expensive affair for
PC
boiler. So CFB boilers have ability to reduce the pollutants in
a cost
effective and environmentally friendly manner.
5.3 To Utilize Worst Quality Of Coal:
In order to utilize the worst quality of coal containing high
ash (up to
70%) it will be effective that we go for CFB boiler instead of
PC-fired
boiler, which is unable to handle such a high ash coal.
5.4 Repowering:
In order to replace existing PC fired boiler, economically
and
environmentally acceptable manner repowering of PC boiler will
play a
major role in near future.
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