COMB TEETH TYPE WATER-COOLED COLUMN AND HEARTH HAVING SAME

摘要

A water-cooled column (4) in the hearth of a circulating fluid bed boiler is enclosed by water-cooled membrane walls (41). The water-cooled column (4) includes a lower section (A), an upper section and a transition section. The lower section (A) is a single column. Inner secondary air ports (400) are arranged on the side wall of the lower section (A). The upper section includes a plurality of separated columns (B, C). The water-cooled membrane wall (41) at the lower section (A) extends to the upper section through the transition section. Each separated column (B, C) is enclosed by the corresponding water-cooled membrane walls (41) extending upwards from the water-cooled membrane wall (41) that encloses the lower section (A). And the plurality of separated columns (B, C) are divided from each other.