Technical papers were invited, for Issue # EE 04. We received
only 5 papers.
"Recovery of the sensible heat of high temperature stack gas
from combustion systems (boilers, furnaces) by retrofitting a
heat exchanger seems to be a standard but nevertheless controversial
recommendation. Implicit complications are increased pressure
drop, fouling of heat exchanger and occasionally the need for
an ID fan to overcome the pressure drop. We are looking for information
about best and as well worst cases and why these work or don't
work. Furthermore documentation should be given with regard to
financial attractiveness because recovery of waste heat is not
always a cost effective option."
This time we award Rs 3,000 to the worst paper. All refers
to the firm, the author and the manufacturer has been deleted
from the paper. In this case one would first ask, what is the
actual fuel gas design temperature of the boilers, or is
the mentioned flue gas temperature range of 350oC -
415oC so high due to fouling, or is the boiler very
inefficient by design. A complete techno/economical analysis
would most likely show that, it is better to replace the boiler
or clean the fire tubs, including descaling of the water side.
The manufacturer of this boiler confirmed to us that the design
temperature is 200oC.
Mr. P. R. Chari presented a convincing case backed up by
calculations, but it is not clear what was implemented as a retrofit
and what was part of the original design of the furnace. Nevertheless
we award him Rs. 2,000.
Another paper from Mr. Sunil Kulkarni presented cases that seem
to exist for the time being on paper and have not been implemented
yet. We award Rs. 1,000, although we are sceptical about the economics
and of ammonia absorption refrigeration using waste flow
gas from power plants. The suggestion to directly utilize this
waste heat without the intermediate step of producing steam however
makes sense.
The winners are :
1. Undisclosed First
prize (Rs. 3,000)
2. Mr. P R Chari Second
prize (Rs. 2,000)
3. Mr. Sunil Kulkarni Third prize
(Rs. 1,000)
Congratulations to winners!
For more details see the announcements on www.energymanagertraining.com
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