NOVELTY - Biomass formed fuel gasification and combustion furnace comprises a fire grate base (1), a mechanically moved fire grate (2), a primary air room (5), and primary air channel on two sides of the primary air room. The fire grate and primary air room are on the lower part of the fire grate. A convection heat exchange tube bundle (25) is on two sides of the upper part of the fire grate base. The boiler barrel (13) is on the middle of the upper part of the boiler. The two sides of the boiler barrel are convection heat exchange tube bundles.    USE - Biomass formed fuel gasification and combustion furnace for biomass used for making fuel (claimed).    ADVANTAGE - The biomass formed fuel gasification and combustion furnace has low running cost, high heat efficiency, low dust exhaust consistency, saves energy, and protects the environment.    DETAILED DESCRIPTION - Biomass formed fuel gasification and combustion furnace comprises a fire grate base (1), a mechanically moved fire grate (2), a primary air room (5), and primary air channel on two sides of the primary air room. The fire grate and primary air room are on the lower part of the fire grate. A convection heat exchange tube bundle (25) is on two sides of the upper part of the fire grate base. The boiler barrel (13) is on the middle of the upper part of the boiler. The two sides of the boiler barrel are convection heat exchange tube bundles. The lower protrusion type front arch (10) and a fold line type back arch (15) are on the upper part of the fire grate. The fold line type back arch is higher than the lower protrusion type front arch. The furnace chamber is divided into two parts by lower protrusion type front arch. A furnace chamber comprises upper part of the lower protrusion type front arch, and upper space of the fire grate. An upper furnace chamber comprises upper part of the lower protrusion type front arch and lower space of boiler barrel. The outlet of the lower protrusion type front arch is on the back part of the lower furnace chamber. A partition wall (24) makes the convection heat exchange tube bundle separate from the upper furnace chamber. A front partition wall is on the front part of the upper furnace chamber. A front smoke room is on the front part of the front partition wall. A smoke outlet of furnace chamber is on the back part of the space between the boiler barrel and fold line type back arch. The flow space of smoke air of the convection heat exchange tube bundle is connected with the front smoke room and the smoke outlet of furnace chamber. A secondary air channel is between the fire grate base and the convection heat exchange tube bundle. A row of secondary air jet tubes on two side walls of lower furnace chamber separately are connected with the secondary air channel. A tap hole is under the back part of the fire grate. A fuel hopper is set the front part of the fire grate. A fuel distributor is installed in the fuel hopper. The lower part of the fuel hopper is divided into a front and back material dropping passages. A pre-combustion chamber is between the two material dropping passages. The boiler wall comprises fireproof layer and insulated layer. The boiler is a bilateral symmetry structure. The fuel distributor is in the fuel hopper at the front of the fire grate. The lower part of the fuel hopper is divided into two material dropping passages by the fuel distributor. The outlet of the lower protrusion type front arch is on the back part of the lower furnace chamber. The fold line type back arch is higher than the lower protrusion type front arch. A secondary air channel is between fire grate base and convection heat exchange tube bundle. A row of secondary air jet tubes on two side walls of lower furnace chamber separately are connected with the secondary air channel.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross sectional view of mechanical moving fire grate biomass formed fuel gasified combustion boiler.    Fire grate base (1)    Fire grate (2)    Primary air room (5)    Lower protrusion type front arch (10)    Boiler barrel (13)    Fold line type back arch (15)    Partition wall (24)    Convection heat exchange tube bundle (25)