CFBC, preferred Technology for lignite fuel - Experiences - Infraline

As lignite has high sulfur content, in absence of proper Sulfur capture, chances of
cold end corrosion in tubular Air Pre-heater are more and may require frequent
replacement of entire cold banks. Presence of chlorides in lignite will further
aggravate the problem.
Figure-2: Cooling curve of CFBC Boiler at SLPP
1000
900
800
700
Furnace Bottom Temp
600
500
400
300
200
100
0
1 4 7 101316192225283134374043464952555861646770737679828588919497
Time in Hrs
Max
Min
CONCLUSIONS
For a developing nation planning to meet the rising demand with capacity additions, use
of technologies, which are environmental friendly and minimize the impact on
environment, is necessary. CFBC is one of such Technologies that operates under low
combustion temperatures and has facility to add sorbent. It effectively minimizes the Sox
and NOx emissions. It can also use poor quality fuels for effective, efficient combustion
minimizing emissions and impact on environment. Advantages of CFBC technology,
special commissioning activities of this environmental friendly technology, experiences
have been briefly discussed. Several power generating companies have adopted this
technology. Problems experienced by power generators using CFBC technology have
been presented along with special care to be taken during erection stage. To encourage
the adoption of such environment friendly technology, government or the beneficiary
should help the generating companies by relaxing the normative operating/commercial
norms such as Auxiliary power consumption and reimbursement of cost of fuel additive.