Method of gasification of biomass using gasification island

A method of gasification of biomass using a gasification island, the gasification island comprising:

• a biomass pre-treatment and storage unit, a biomass feeder, an external heat source, a gasifier, a crude syngas cooling unit, a crude syngas washing unit, a fresh syngas storage unit, and an ash and wastewater treatment unit, the method comprising:
• pre-treating and storing biomass in the biomass pre-treatment and storage unit;
• crushing the stored biomass in the biomass feeder;
• gasifying the biomass in the gasifier by feeding the biomass to the gasifier while supplying the external heat source and an oxidant to the gasifier, controlling an operating temperature of the gasifier at between 1300 and 1750° C., allowing the biomass to fully contact with the oxidant so that desiccation, volatile matter precipitation, pyrolysis, and gasification reaction occur, respectively, whereby yielding a crude syngas and an ash;
• removing a slag from the gasifier in a liquid state;
• cooling the crude syngas by introducing the crude syngas to a quench tower and a two-stage waste heat boiler of the cooling unit to decrease the temperature of the crude syngas to between 85 and 200° C. and to recover the sensible heat;
• and
• washing the crude syngas after sensible heat recovery in the washing unit and removing the dust therefrom in an electric dust precipitator of the ash and wastewater treatment unit to obtain the clean and fresh syngas having both a dust content and a tar content of 10 mg/Nm3 and a temperature of 45° C.;
• transporting the clean and fresh syngas to the gas storage tank for storage;
• wherein
• the gasification island is operated at a negative pressure.