### NUMERICAL ANALYSIS OF ROTARY AIR PREHEATER: A

2016-4-23u2002·u2002steam boiler [7]. Installation of air preheater reduced fuel consumption by as much as 25%. In modern utility boilers preheater contributes up to 20% of the overall boiler efficiency and 2% of total investment. For every 200c drop in flue gas temperature, the boiler efficiency increases by 1%. In this paper 1-D and 3-D numerical models of heat

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