The invention discloses a
biomass low-carbon energy-saving boiler with a spiral grain fire tube, mainly comprising a secondary burning chamber (1), a boiler bridge (2), a semi-gasification burning chamber (3), a feeding door (4), a banking
smoke outlet (5), a fire outlet (6), a fire inlet (7), a
water jacket (8), a spiral grain fire tube (9), a spiral grain fire tube convex edge (10), a
smoke drum joint (11), an ash cleaning door (12) and a
back burning port (13), wherein the spiral grain fire tube is vertically welded or welded in a boiler body in a balanced manner, the upper part and the lower part of the spiral grain fire tube are sealed, the fire inlet and the fire outlet are provided, and in burning, the
flame enters the fire tube and is directed to move by the convex edge in the spiral grain tube without rising or being discharged directly. The
biomass low-carbon energy-saving boiler has the advantages of full burning,
high heat utilization ratio,
energy conservation, emission reduction, easiness for promotion and implementation and better economic benefit.