At Drax Power Station, operated by National Power UK, high-chlorine coal is usually burned, and equipment such as pumps, valves, centrifuges and mixers operates in corrosive and erosive conditions: a temperature of 50-60degC, pH 4.5 to 6 and 30,000-40,000ppm Cl-.
Alloy 2205 stainless steel was not best suited to this environment, so cast and wrought Ferralium® 255 was used to produce pumps, valves, side entry mixers, absorber spray nozzle bolting and gas distribution plates.
The same approach was also used at Ratcliffe Power Station with the Ferralium® 255 alloy.
