FEI-FEVI 2010 EEC Report filed March 31, 2011 - FortisBC

FORTISBC ENERGY INC. AND FORTISBC ENERGY (VANCOUVER ISLAND) INC.
2010 ENERGY EFFICIENCY AND CONSERVATION ANNUAL REPORT
used. Energy efficiency opportunities for boilers include near condensing and condensing
boilers, boiler economizers (with condensing economizers, the overall boiler efficiencies can
exceed 90 percent), boiler combustion air-preheating, boiler condensation heat recovery, and
advance boiler controls such as boiler reset controls. For example, the automatic control of
excess air (oxygen trim) increases the boiler efficiency by one to two percent. A general rule
accepted by the industry is that a one percent reduction in excess oxygen will reduce fuel usage
by one percent. For very large boilers, efficiency gains of 0.1 percent mean significant annual
savings and these controls usually measure carbon monoxide as well. Even with well-adjusted
burners providing the minimum flue gas temperatures while achieving complete fuel
combustion, there is ample room to recover some of this heat that would otherwise “go up the
stack”. Heat exchangers can be used for preheating boiler feed water or combustion air. A 20°
C (36° F) reduction in flue gas temperature will improve boiler efficiency by about one percent.
The following cross-industry technology matrix provides a summary of savings opportunities vs.
for each different industry. Blue shading indicates an opportunity available in that industry. One
of the key objectives for the Industrial Sector program area is to focus on these opportunities
when developing energy efficiency and conservation programs.
SECTION 9: INDUSTRIAL SECTOR PROGRAMS Page 173