Apparatus for contacting liquid with a gas.

摘要

Apparatus for contacting liquid, in a tank (10) containing a body of same, with a gas. A generally tubular draft member (21) containing an axial downpumping impeller (32) is oriented in the tank with its central axis aligned vertically. Liquid flow restriction means (27) are positioned proximate the draft member liquid inlet (28) above the impeller and restricting cross-sectional liquid flow area of the liquid inlet to from 0.50 to 1.10 times cross-sectional area of the draft member. Gas flow passage means (29, 35, 38) are provided having an inlet opening exposed to a source of gas and an outlet positioned proximate to the liquid flow restriction means in liquid flowing to the axial pumping impeller means, whereby liquid flowing through the liquid flow restriction means under action of the axial pumping impeller is mixed with gas from the gas flow passage means to effect gas-liquid contacting in the liquid pumped by the axial pumping impeller.