NOVELTY - A vertical boiler comprises a boiler body, where middle part of the boiler body has cylindrical shape. Upper part and lower part of the boiler body have spherical crown-shape, where a smoke channel is arranged on axis of the boiler body. The smoke channel is passed through the upper part and the lower part of the boiler body, where the upper part of the boiler body is provided with a pressure adjusting valve, a pressure meter, a steam discharging pipe with a steam discharging valve and a water inputting pipe with a water inputting valve.    USE - Vertical boiler.    ADVANTAGE - The vertical boiler ensures simple structure, convenient usage, where burned residue can be used as indispensable main raw material of slag-trapping temperature-preserving covering agent of the industrial product. The heat energy generated by burning vegetable crumbles generates vegetable carbide powder and vegetable dust, which provides hot water and steam.    DETAILED DESCRIPTION - A vertical boiler comprises a boiler body, where middle part of the boiler body has cylindrical shape. Upper part and lower part of the boiler body have spherical crown-shape, where a smoke channel is arranged on axis of the boiler body. The smoke channel is passed through the upper part and the lower part of the boiler body, where the upper part of the boiler body is provided with a pressure adjusting valve, a pressure meter, a steam discharging pipe with a steam discharging valve, and a water inputting pipe with a water inputting valve. Pressure adjusting valve, pressure meter, steam discharging pipe with a steam discharging valve and water inputting pipe are connected with the boiler body. The steam discharging pipe is provided with a gas flow meter, where side wall of the boiler body is provided with a manhole and a water level gauge. The water level gauge is connected with the boiler body. An INDEPENDENT CLAIM is also included for a method for cogenerating vegetable powder by using vertical boiler, which involves:    (A) storing water by opening water inputting valve of the vertical boiler water inputting pipe;    (B) putting ignited wood materials in internal part surrounded by heat exchanging pipe;    (C) acumulating vegetable crumbles on external part of the heat exchanging pipe;    (D) igniting wood materials to ignite the vegetable crumbles for making vegetable crumbles burn form; and    (E) collecting burned residue of the vegetable crumbles after finishing the vegetable burning to get vegetable powder.