The invention relates to a vertical
biomass gas dual-purpose atmospheric-pressure hot water boiler. The vertical
biomass gas dual-purpose atmospheric-pressure hot water boiler is composed of a boilershell, an annular water chamber, a
combustion chamber, a
flue and a drawer-type dust hopper; a water inlet
pipe seat, a water outlet
pipe seat and an atmospheric communicating
pipe seat are arranged on the boiler shell, the drawer-type dust hopper is arranged at the bottom of the boiler shell, a feeding
machine connector is formed in one side of the
combustion chamber, a
sewage-discharging pipe seat is arranged at the bottom of the annular water chamber, the
flue is formed in the annular water chamber and comprises a main
flue, a two-return-
stroke flue and a three-return-
stroke flue, the bottom end of the main flue is connected with the
combustion chamber, the top end of the main flue communicates with the two-return-
stroke flue through a first
smoke chamber, the two-return-stroke flue communicates with the three-return-stroke flue through a second
smoke chamber, a third
smoke chamber is formed in the top end of the three-return-stroke flue, the third smoke chamber communicates with the exterior through a smoke vent, and a detachable pot-cover-shaped partition cover is arranged between the first smoke chamber and the third smoke chamber. The vertical
biomass gas dual-purpose atmospheric-pressure hot water boiler has the beneficial effects that (1) the three-return-stroke flue is adopted, thus the smoke travel is increased, the heat
exchange time of smoke and water is prolonged,the heat efficiency of the boiler is improved advantageously, the smoke discharging temperature is decreased, and the advantages of
high heat efficiency, low smoke discharging temperature and low dust content are achieved; and (2) the detachable pot-cover-shaped partition cover is arranged, on the one hand, the first smoke chamber and the third smoke chamber can be separated, the complete flue isformed, on the other hand, the partition cover can be detached, thus dust in the flue is conveniently cleared, and maintenance is convenient.