Method for avoiding high-temperature corrosion on pipes and pipe walls in large boilers and pipes and pipe walls for putting this method into practice feeds a flue gas past on the pipe walls of an air preheater made from ceramic pipes.

摘要

Flue gas in a flue gas current (1) is fed past on the pipe walls of an air preheater (2) whose pipes and pipe walls are made from ceramic pipes. The air preheater is not connected to a water circuit in a boiler. Air from there reaches an economizer (4) via a vaporizer (3). Under the boiler's operation superheated ceramic pipes in the air preheater release heated air in an air circuit (5) to a superheater (6) where a current of steam is generated.