The portion of lignite reserves in China's coal resources is huge.The efficient and clean techniques of utilizing the lignite semi-char are the main factors restricting the development of lignite pyrolysis and its cascade utilization.The cyclone furnace combustion technique is proposed to burn the lignite char.The distribution of temperature

velocity

species concentration of the lignite semi-char burning in a cyclone furnace is simulated using the Fluent software.Moreover

the carbon conversion rate and NO_xemission characteristics of the lignite semi-char are investigated

and the experimental data are compared with the simulation results.The results show that

the model used in the simulation can accurately descript the combustion of lignite char in cyclone furnace.The burn-out rate of the semi-char is greater than 98.4% and the concentration of NO_xis less than 144mg/m~3 when the excess air ratio is between 0.5and 0.7.It is proved that burning lignite semi-char in cyclone furnace is an efficient and clean way to utilize the lignite semichar.