To solve the problems of flue gas and steam temperature deviation of supercritical boiler

the temperature deviation of the steam separator and the following heating surface are investigated in the domestic first 600 MW supercritical W-shaped flame boiler. Moreover

a special outlet cross layout structure of steam separator is designed and the role of the special outlet cross structure is investigated by thermal calculation. The results indicate that the steam temperature deviation of supercritical boiler is increased with the the flue gas temperature deviation and the growth of the following heating surface during actual operation.Meanwhile

the special outlet cross layout structure of steam separator has a remarkable effect on decreasing the steam temperature deviation

which has been reduced to half of the original level. Therefore

the special outlet cross layout structure of supercritical boiler steam separator is worthwhile to distinctly decrease the steam temperature deviation and increase the safe in operation of supercritical boil.