method for removal of soot by dispersion of steel balls in a heat exchanger.

摘要

The known method for removing soot or the like adhered to heat transfer tubes of a heat-exchanger by providing a steel ball scatterer above the heat transfer tubes and intermittently scattering steel balls towards the heat transfer tubes, is improved. The improvements reside in that a steel ball scattering rate is chosen small at the time of commencing the scattering and thereafter it is increased either in a stepwise manner or continuously. Preferably, within a main body casing of the heat-exchanger (1), a plurality of steel ball collision preventing plates having their central portions warped upwards are provided between the steel ball scatterer (3) and the heat transfer tube group (2), in order to prevent fins (8b) of finned heat transfer tubes (8) from being damaged by steel balls falling from the steel ball scatterer and directly colliding against the fins.