plume or for other uses where heat is needed within a power plant fig2 a and fig2 b are diagrams generally depicting embodiments of an exhaust processing and heat recovery system 215 in accordance with the proposed invention fig2 a is a diagram depicting one embodiment of an eprs 215 that is includes an alkaline injection system 276 to interactively introduce a sorbent of alkaline particles 275 into the flue gas stream fg 1 prior to fg 1 being received by the air preheater 250 via inlet 253 alkaline injection system 276 has the ability to selectively introduce various size distributions of alkaline particles 275 in the sorbent in this embodiment the eprs 215 includes a regenerative air preheater 250 a particulate removal system 70 and a scrubber system 80 an fd fan 60 is provided to introduce an air stream a 1 into the cold side of the air preheater 250 via inlet 251 the particulate removal system 70 may include for example an electrostatic precipitator esp and or a fabric filter system bag house or the like scrubber system 80 may include for example a wet or dry flue gas desulphurization wfgd dfgd system during operation of the eprs 215 sulfur trioxide so 3 and water vapor h2o in the flue gas fg 1 can combine to form an acid vapor in the operating temperature range of the flue gas upstream of the air preheater 250 once the flue gas containing this acid vapor reaches the air preheater 250 it will come in contact.