RECUPERATOR FOR RADIANT TUBULAR BURNER Russian patent published in 2013 - IPC F23C3/00 F23D14/12 F23L15/04 

FIELD: power industry.

SUBSTANCE: heat recuperator for a radiant tubular burner includes a burner pipe and a discharge pipe. Burner is installed at the burner pipe inlet. Recuperator is installed at the discharge pipe outlet and includes a heat exchanger. Heat exchanger is located inside a connection pipe having the possibility of being connected to the discharge pipe. Heat exchanger includes a guide section for direction of the air that is subject to pre-heating to a tip located on the recuperator end on the flue gas inlet side, and a return section opening to a line supplying the air to the burner. The tip determines the way for changing combustion air flow direction to the opposite one and for its direction to the return section. Some portion of flue gases is carried over with combustion air and mixed with it. Heat exchanger occupies only some part of the connection pipe cross section, and the other part remains free for passage of flue gases to the outlet. Guide section of heat exchanger includes many heat exchange tubes parallel to the connection pipe axis. Both fluid media have parallel flows flowing in opposite directions. Heat exchange tubes are opened inside the tip. An air circuit is made in the form of a loop. The return section is offset in radial direction relative to the tubes of the guide section. Cross sections of heat exchange tubes and the return section are located on the outer side relative to each other.

EFFECT: invention allows reducing mechanical stresses, enlarging heat exchange surface area and decreasing recuperator weight.

16 cl, 9 dwg