To reduce SO2 emissions at St Marys Cement’s Bowmanville plant in Canada, the cement producer injects lime into the SO2 gas stream using purchased hydrated lime. To save this significant cost, a lime hydrator was installed at the works by FLSmidth, which not only eliminated the need to acquire the hydrated lime but also associated transport and storage costs. By Dale Frost, St Marys Cement, Canada, Jared B Weston and Mark Blower, FLSmidth Inc, USA.
Designed and supplied in 1989, St Marys Bowmanville cement plant has a capacity of 5800tpd. It consists of a two-string, five-stage preheater tower with a separate-line calciner, a dia5m x 80m kiln and a reciprocating grate cooler. In addition, the plant’s bypass handles about 31 per cent of the kiln exit gases.
