Patent ID: 8142744

Claim:
An air pollution control system comprising: a) an emission treatment system configured to receive flue gas, to reduce at least one pollutant therefrom to convert flue gas into emission treated flue gas, wherein the emission treatment system includes at least one catalyst bed for removing pollutants from flue gas; b) a first air heater in fluid communication with the emission treatment system and including a heat exchanger configured to heat forced air introduced thereto above a base temperature and to thereby cool emission treated flue gas from the emission treatment system introduced to the heat exchanger of the first air heater to a stack discharge temperature; and c) a second air heater in fluid communication with the first air heater to receive heated forced air therefrom, the second air heater including a heat exchanger configured to heat forced air introduced thereto to a preheat temperature for combustion in a boiler and to thereby cool flue gas introduced from a boiler to the heat exchanger of the second air heater to an emission treatment temperature, the second air heater being in fluid communication with the emission treatment system to introduce cooled flue gas thereto.