The invention provides a normal-pressure
fixed bed biomass gasification furnace and a
biomass normal-pressure gasification method. The gasification furnace comprises a gas collecting chamber, condensation chambers, a deoiling chamber, a dust removal chamber, a gasification chamber, a doughnut shape-like gasification pipeline, a first gasification agent pipeline, a second gasification agent pipeline, a
drying preheating chamber, a screw pushing mechanism, a feeding conveying mechanism and a gasification agent chamber, the doughnut shape-like gasification pipeline is arranged in the
drying preheating chamber and the gasification chamber, the screw pushing mechanism is arranged in the doughnut shape-like gasification pipeline, the gasification agent chamber is connected to the first gasification agent pipeline and the second gasification agent pipeline, the first gasification agent pipeline extends along the central axis inside the doughnut shape-like gasification pipeline, the second gasification agent pipeline extends in a manner clinging to the outer wall of the doughnut shape-like gasification pipeline, each of the first gasification agent pipeline and the second gasification agent pipeline is provided with a plurality of gasification agent outlets, the dust removal chamber is arranged above the gasification chamber, the deoiling chamber is arranged above the dust removal chamber, the condensation chambers are arranged above the deoiling chamber, and the gas collecting chamber is arranged above the condensation chambers. The gasification furnace has the advantages of integral integration, high gasification efficiency and wide application range.