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Best Practices - Steam Recovery
Heat Recovery/Cogen Wise Rules from EPA - Wise Rules for Industrial Efficiency (1.4M pdf)
- Recovering waste heat can reduce a typical facility’s total energy use by about 5% with an average simple payback of 16 months.
- Reducing net stack temperature (outlet temperature minus inlet combustion air temperature) by 40°F is estimated to reduce the boiler’s fuel use by 1% to 2%.
- Preheating furnace combustion air with recovered waste heat can save up to 50% of the furnace’s energy use.
- Using an economizer to capture flue gas waste heat and preheat boiler feedwater can reduce a boiler’s fuel use by up to 5%.
- Removing a 1/32 inch deposit on boiler’s heat transfer surfaces can reduce a boiler’s energy use by 2%; removing a 1/8 inch deposit can reduce a boiler’s energy use by over 8%.
- Gas turbines with heat recovery equipment typically cost from $600 to $1,000/kW. Larger gas turbines may be available for half the cost per kW.
- A typical cogeneration project may reduce primary energy consumption (including fuel inputs at off-site powerplants for purchased electricity) for steam and electricity generation by 10% to 15%.
- Cogeneration systems can save about 9% of a typical facility’s primary fuel inputs for on-site energy use (i.e., including fuel savings at off-site powerplants for purchased electricity) with an average simple payback of 34 months.
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