The invention discloses a 
biomass three-section type entrained flow 
bed gasification technology with the function of 
waste heat utilization, which relates to the technical field of energy 
chemical technology. The gasification technology is realized in a way that: carbon 
powder, 
pyrolysis gas and 
oxygen, which are generated after the 
biomass is pyrolyzed, enter an entrained flow 
bed to obtain synthetic gas through gasification, and the energy of the gasification 
waste heat is transferred to water by a 
heat exchanger of a gasifier, thereby producing 
superheated steam. The gasifier of the entrained flow 
bed is divided into a high-temperature entrained flow bed section, a high-temperature 
heat exchanger section and a low-temperature 
heat exchanger section, wherein the high-temperature entrained flow bed section adopts a dry ash extraction entrained flow bed gasification technology, and the temperature of the synthetic gas at the outlet is 1280-1320 DEG C; at the high-temperature heat exchanger section, the temperature of the synthetic gas at the inlet is 1280-1320 DEG C, the temperature at the outlet is 580-600 DEG C, a shock chamber and a high-temperature 
superheater are arranged in the high-temperature heat exchanger section, and the synthetic gas enters the shock chamber at the temperature of 1000-1100 DEG C and leaves at the temperature of 700-800 DEG C; and at the low-temperature heat exchanger section, the temperature of the synthetic gas at the inlet is 580-600 DEG C, the temperature of the synthetic gas at the outlet is 220-230 DEG C, and a low-temperature 
superheater and a 
coal economizer are arranged in the low-temperature heat exchanger section. The invention is used for high-efficiency gasification of 
biomass.