REGENERATIVE AIR PREHEATER

摘要

1504619 Thermal regenerators APPARATEBAU ROTHEMUHLE BRANDT & KRITZLER 9 July 1975 [16 July 1974] 28905/75 Heading F4K In a thermal regenerator of either the rotary matrix or rotary duct type, the cooler medium (e.g. air) before it reaches the regenerative mass is preheated by the hotter medium (e.g. boiler flue gas) in a recuperator located in the duct conveying the cooler meduim to the regenerative mass. Fig. 3 shows a stationary regenerative mass 1 with stationary ducts 2, 3 conveying hot flue (arrows B) to and from the mass, and with rotating air hoods 6, 7 conveying air (arrows C, D, E) to and from the mass. Some of the hot gas (arrow J) is diverted by a gas catching wing 20 through recuperator tubes 19 (or alternatively hollow plates) extending across the air inlet duct upstream of the mass 1, the diverted gas rejoining the main stream B after passing through the recuperator elements 19. In the regenerator of Fig. 4 with a rotating mass 11, some of the hot gas from the main stream M is drawn as a stream N by a suction fan 36 into a gas catching wing 33 whence it passes through the recuperator elements 35 extending across the stationary air inlet duct 30 upstream of the mass 11. Gas is also drawn from the main stream M by the fan 36 into a further gas catching wing 38. A flap valve 37 is said, by reducing the flow of diverted gas into the wing 38, to regulate the amount of flue gas diverted through the elements 35. The recuperator elements (viz. tubes 19 or 25 or hollow plates) may be of cast iron with some at least of their gas contacted surfaces coated with a corrosion-resistant material such as glass, ceramic or enamel.