By experimental study

the main reason for long term low reheat steam temperature of the tower type boiler was as follows:to prevent the boiler from slagging

the heating surface of water wall was increased during designing but that of the reheater and superheater was not

leading to imbalance of the heating surface.Thus

in the case of no modification on the heating surface

combustion regulation and soot blowing optimization were conducted

which increased the reheat steam temperature by about 20 ℃

and reduced the reheater outlet temperature deviation from 20 ℃ to 10 ℃ or even lower.The economic benefit was dramatically improved.