Method and system for producing synthetic gas from biomass

A method for producing synthetic gas from biomass, the method comprising the following steps:

• a) generating a first superheated water vapor at a temperature of 500-800° C. grinding the biomass, feeding the biomass into a pyrolysis furnace while spraying the first superheated water vapor into the pyrolysis furnace to heat the pyrolysis furnace to a temperature of 500-650° C., contacting the biomass with the first superheated water vapor for a pyrolysis reaction to yield crude synthetic gas and ash comprising coke;
• b) cooling the ash, and separating the coke for the ash;
• c) generating a second superheated water vapor at a temperature of 1200-1600° C., transporting the crude synthetic gas and the coke into a gasifier, spraying the second superheated water vapor into the gasifier to heat the gasifier to a temperature of 1200-1400° C., contacting the biomass with the second superheated water vapor for a gasification reaction to yield primary synthetic gas;
• and
• d) cooling the primary synthetic gas, removing dust from the primary synthetic gas, deacidifying the primary gas, and desiccating the primary synthetic gas to obtain clean synthetic gas.