In power stations and refineries, “warm, dry” flue gases are cooled down to a “cold, wet” state prior to the flue gas scrubbing process. The flue gases produced by burning fossil fuels, such as coal or fuel oil, often contain a high level of sulphur compounds (SOP3, SO4, H2SO4), hydrochloric acid (Hal) and hydrofluoric acid (HF). When the heat is extracted, a highly aggressive condensate is formed that presents problems even for high alloy stainless steels. This isn’t the case with fully fluorinated PFA materials: they are basically immune to corrosion. Another advantage of PFA film linings is their excellent non-stick properties. BEKAFLON from STEULER-KCH is a new mechanically anchored system of materials for the highly demanding corrosion protection requirements of raw gas heat exchangers, outlet ducts and scrubber inlets.
The newly developed BEKAFLON lining system is now being installed during the course of maintenance work on the Mannheim power station. 240 square metres of the highly corrosion-resistant PFA lining was fitted in the raw gas duct and mechanically fixed in place using bolts. The heads of the bolts were covered with caps made of PFA and welded to the lining to form a watertight seal.