Energy Conservation in Boilers
&
Latest Technological Trends
by
R. Virendra
Dy Director General
NATIONAL PRODUCTIVITY COUNCIL
Boiler Efficiency Evaluation Methodology
• Direct Method
• Indirect Method
– Dry Fluegas Loss
– Loss due to H2 in fuel
– Loss due to Moisture in fuel
– Loss due to Moisture in air
– Loss due to partial combustion
– Surface Heat Losses
Energy Conservation Opportunities in Boilers
• Reduce Stack Temperature
• Feedwater Preheating using economizer
• Combustion Air Preheating
• Incomplete Combustion
• Control Excess Air
• Reduce Convection and Radiation losses
• Automatic Blowdown Control
• Reduction of Boiler Steam Pressure
• VFDs for Pumps, Fans
• Proper Boiler Scheduling
• Replacement of Old Boilers
Latest Trends in Boiler Technology
• Ultra Super Critical Plants – Steam Temp of
6000C
• Advanced Ultra Super Critical Plants – Steam
Temp >7000C
• Low NOx combustion technology
• Air Quality Control Systems – Removal of
elemental mercury
• Carbon Capture and Storage