Rational utilization of biomass energy is of great significance to reducing environmental pollution and carbon emission reduction. Using the stochastic pore model of gasification process as a tool

numerical calculation of semi-coke particles gasification process was carried out

and the relevant criteria of semi-coke gasification were analyzed. The main conclusions are as follows. At gasification temperature of 1 123 K

the gasification process is controlled by chemical reaction process when the particle radius is less than 0.26 mm

by both chemical reaction process and CO_2 diffusion process when the particle radius is 0.26～1.45 mm

and by CO_2 diffusion process when the particle radius is greater than 1.45 mm. When the gasification temperature is 973～1 223 K

the higher the temperature

the greater the influence of CO_2 diffusion on the reaction rate. When the temperature exceeds 1 223 K

the CO_2 diffusion becomes the main factor affecting the gasification reaction rate. In actual gasification

the method of reducing coke particle size can be adopted to accelerate the gasification process

and the particle size should be controlled below 1.45 mm. If the particle size is less than 0.26 mm

the gasification can be accelerated by increasing the gasification temperature to prevent the gasification rate from being completely controlled by the CO_2 diffusion process. For 1 mm coke particles

the gasification temperature should be kept below 1 223 K.