Patent ID: 11859867
Assignee: HENAN YUANDA BOILER CORPORATION LTD
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 4:
5. The premixed low-nitrogen gas boiler according to claim 4, wherein an inlet of each of the Y-shaped airflow channels (5c) is a flat rectangular, an outlet of each of the Y-shaped airflow channels is a divergent channel, and a spiral ring rib (5d) is arranged in an outlet elliptical swirl channel; the two of the comb-shaped water-cooling modules (5b) are connected by means of a flow equalizing partition plate (5e); and a plurality of rows of the hearth tube bundles (7) are arranged in the ladder-shaped convergent hearth (8) at a front end of the exhaust port (10), and a number of the plurality of rows of the hearth tube bundles (7) is reduced row by row.