Based on the distribution of wall temperature

the main factors affecting water wall temperature deviation of lower vertical water wall have been investigated in the 660 MW ultra supercritical boiler. The conclusion indicated that increasing the proportion of high-sodium coal or putting the upper combustors into running can effectively reduce the heat loading in the combustion zone

which benefits uniformity of lower water wall temperature. Through changing the distribution of the heat loading

the angle of combustors has opposite influence on water wall temperature deviation at different load. With optimized adjustments

the wall temperature deviation of vertical water wall in the ultra supercritical boiler can be well controlled.