AIR HEATER Russian patent published in 2007 - IPC F23L15/04 

FIELD: heat supply systems.

SUBSTANCE: air heater comprises shell with branch pipes for supplying and discharging air, furnace provided with burning device and chimney and mounted inside the shell, and convection member made of pipes connected with the collectors. The furnace is made of a cylindrical sleeve. The pipes of the convection member are arranged in staggered order around the furnace parallel to its cylindrical surface. The inlet collector is connected with the furnace and is mounted in front of the burning device. The inlet collector is made of a sector with a blunt angle. The outlet collector is connected with the chimney and is made of a sector with an acute angle. The device is provided with the intermediate collector. Between the shell and furnace there are transverse baffles.

EFFECT: simplified structure.