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