| 摘要 |
A double screw of a reaction tank, which can perform an agitational operation uniformly and efficiently all over an internal part of the reaction tank, is provided. In a reaction tank a lower part or the whole body of which is formed in a semi-cylindrical shape, a double screw of the reaction tank comprises: a shaft(200) longitudinally installed at the center of the reaction tank; and a plurality of blades(300) in which an inner diameter part(310) with a length corresponding to 40 to 60% of radius of the reaction tank and an outer diameter part(320) with a length corresponding to 80 to 95% of the radius of the reaction tank are respectively oppositely formed around the shaft, and which are continuously formed along an axial direction of the shaft. The inner diameter part is inclined to left and right sides in inclination angles of 55Œ5 degrees and 125Œ5 degrees based on ends of the blades. The outer diameter part is inclined to left and right sides in inclination angles of 65Œ5 degrees and 130Œ5 degrees based on the ends of the blades. |
