| 摘要 |
PURPOSE:To keep an oxygen transfer volume coefficient to a nearly constant level at the same draft independent of the liquid level over a wide variation range of the level by placing a vertically distributed openings at the upper part of a draft tube in a bubble tower. CONSTITUTION:Vertically distributed openings 3 are opened at the upper part of a draft tube 2 in a bubble tower 1 and the tower is used in a liquid-phase oxidation, microbial reaction, etc. The gas and liquid are freely circulated between the inside and the outside of the draft tube 2 through the openings 3 to enable the control of the liquid level even if the liquid level in the bubble tower is lowered below the upper edge of the draft tube 2. |
