In order to deeply study the combustion behavior of coal-water slurry（CWS） in tangentially fired boiler

a numerical simulation of flow field

temperature distribution

and molar concentration of each species in a 200 MW tangentially fired boiler of Nanhai Power Plant has been carried out under 100% full load.The results show that a swirl flow field exists in the whole space of the furnace

and the highest temperature occurs in the burners’ region.Along with increasing the furnace height

the temperature decreases gradually.Molar fraction of each species has corresponding relation with the temperature distribution.The high temperature zone is characterized by high carbon dioxide concentration and low oxygen concentration.The molar fraction near the water wall in burners’ region was more than that in the center

and along with increasing the furnace height

this difference is reduced gradually.