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In many locations throughout North America, nitrogen oxide (NOx) emissions of gas-heated furnaces are limited by law or code. This is typically the case in urban areas or in places where special topographical characteristics intensify the negative local and regional effects of NOx emissions.
Energy costs usually represent a large fraction of operating cost for an industrial furnace. Most of these furnaces use natural gas as an energy source for heating.
Regenerative air preheating is accepted as the most effective way to increase energy efficiency for high-temperature process heating, but it was seen as too complex and expensive for heating small and medium size heat-treating furnaces.
