METHOD & APPARATUS FOR REMOVAL OF THE SLUDGE DEPOSITS ON THE TUBE SHEET OF STEAM GENERATOR

摘要

The method is for removal of the sludge deposits on the tube sheet of a steam generator which comprises, in a vertical cylindrical enclosure closed by the sheet, a bundle of parallel heat exchange U- shaped tubes sealingly connected to the sheet at both ends and distributed to form parallel sheets of tubes. A lance is radially moved from the centre of the tubular plate between two parallel sheets of tubes rather than in the tube lane. Movement occurs in a direction parallel to the tube sheet and in close proximity to the latter. Two streams of cleaning fluid under a high pressure are directed toward the plate from the end of the lance and in directions which are fixed and symmetrical w.r.t. the direction of the two sheets of tubes.