Energy Conservation Opportunity with Variable Frequency Drive in Forced Draft Fan In Boiler House

Energy saving is necessary for saving fuel and energy cost in industry. The energy saving has become one of the main objective of the international and national policies. A considerable level of energy losses are accepted reality in a large number of industries and there is evident potential for energy efficiency improvements. Electric motors use two-third of all electricity in industry, so any chance to reduce this load, even by single figures is highly significant. Most pumps and fans are 20 % oversized for the duties they perform. Also electrical motors are available in specific speed range. Pumps and fans are coupled with electric motor to perform their duties. The boiler house equipment the forced draft fan rotates at full load constant speed and there are energy losses. By using the Variable Frequency Drive (VFD) to reducing operating speed of the FD fan motor from 100% to 80% can save as 50% of energy. To reducing fan speed not only reduces energy consumption but also reduces noise and vibration.