HIGH-EFFICIENT ENERGY-SAVING BOILER

The utility model relates to a high-efficient energy-saving boiler which is an improvement on the existing single-drum boiler. The outside of the stove wall of the original single-drum boiler is additionally provided with a reverse U-shaped convection heating surface, and a burning-out dust arrester is arranged at the back arch flue outlet; the back arch is changed into a double bevel shape, and the volume of the part below the arch is reduced. The utility model can burn the coal with bad quality, discharges less flue gas and dust with low temperature, good burning-out performance and high thermal efficiency.