Method suitable for reducing wall temperature of low-temperature superheater of boiler

The invention relates to the field of boiler design, and discloses a method suitable for reducing the wall temperature of a low-temperature superheater of a boiler, the boiler comprises five coal mills A, B, C, D and E, combustors arranged tangentially at four corners, and over-fire air doors which are arranged at four corners of the upper part of a hearth and are divided into six layers, the over-fire air doors are divided into four layers, namely SA, SB, SC and SD, comprising the following steps that S1, according to the boiler load condition, the coal mill operation combination and the over-fire air door opening degree are adjusted; s2, the residual spin and residual rotation condition of boiler outlet flue gas is improved, and the tail flue gas temperature is evenly distributed; and S3, non-uniformity of the flue gas temperature is eliminated, and the overall flue gas temperature is reduced so as to reduce the wall temperature of the low-temperature superheater. The operation combination of the coal mill