The invention relates to a 1050 MW ultra-supercritical pulverized
coal boiler anti-overtemperature control method. According to the method, a burner burns stably by controlling the operating sequence of a
coal pulverizer, the opening degrees of secondary air
doors from the top layer to the last but one layer are sequentially decreased by controlling the secondary air distribution mode, the temperature of a
hearth outlet is effectively decreased, distribution non-uniformity of the inner wall of a
hearth is reduced, the opening degree of a secondary
air door on the bottom layer is 30%, and therefore flames are supported not to rush downwards and prevented from falling into a dry bottom hopper. The primary air speed of a
powder discharge pipe of the
coal pulverizer ranges from 20 m / s to 30 m / s, the opening degrees of auxiliary air
doors range from 35% to 45%, the secondary
air volume can be reduced by increasing the primary
air volume in the
hearth, and the probability that secondary air impacts primary air
powder on the opposite side due to the too high secondary air speed, so that wall-attached burning is caused is avoided. The control method conforms to octagonal reverse bi-tangential circle boiler power field characteristics, pulverized coal is fully burnt, and therefore the
pipe explosion accident caused by overtemperature generated due to non-uniform inner wall temperature distribution is avoided.