Patent ID: 8327809
Filing Date: 2012-12-11
Classification: F23L,F28D,Y02E

Abstract:
1. A method for preheating primary and secondary oxidant in a tri-sector rotary regenerative oxidant preheater including a stationary housing, a rotor rotatably mounted in the housing, sector plates located at the axial ends of the rotor dividing the preheater into a flue gas sector, a secondary oxidant sector, and two primary oxidant sectors, the secondary oxidant sector being interposed between the primary oxidant sectors, the method comprising providing: a tri-sector rotary regenerative oxidant preheater including a stationary housing, a rotor rotatably mounted in the housing, sector plates located at the axial ends of the rotor dividing the preheater into a flue gas sector, a secondary oxidant sector, and two primary oxidant sectors, the secondary oxidant sector being interposed between the primary oxidant sectors; passing primary oxidant to be heated through the primary oxidant sectors; passing secondary oxidant to be heated through the secondary oxidant sector; passing hot flue gas through the flue gas sector to heat the primary and secondary oxidants; and maintaining the environment in both primary oxidant sectors at about the same negative pressure as that of the flue gas sector; and maintaining the environment in the secondary oxidant sector at a positive pressure.