The invention provides a cross flow type fully-premixed low-
NOx boiler. The cross flow type fully-premixed low-
NOx boiler comprises a draught fan (1), a burner (2), a
smoke outlet (3), an upper annular collecting box (4), a feed water circulating device (5), a
coal economizer (6), a lower annular collecting box (7), a water feed port (8), a steam outlet (9), inner ring membrane type wall pipes (10), middle ring finned pipes (11), outer ring membrane type wall pipes (12), a heat insulating layer (13) and a fireproof layer (14). Through the structural optimization and
integrated design of a body, the burner and the
coal economizer, the heating surface is enlarged, the overall structure is more compact, the occupied land is small, the standarization degree is high, and the efficiency is high.The structure of the
coal economizer is optimized, and the occupied space of the coal economizer is greatly reduced. Meanwhile, a
smoke channel structure of the coal economizer is optimized, and theheat transfer
utilization rate of the body and the coal economizer is greatly increased. In addition, the steam-water connection of the coal economizer is optimized, dead zones and connectors are reduced, the possibility of
oxygen corrosion is reduced, and the service life of the coal economizer is prolonged.