GB658521A - Improved means for adding insoluble or granular solid to liquid - Google Patents

Abstract

658,521. Mixing fluids in flow in proportionate quantities. PATERSON ENGINEERING CO., Ltd., and BAILY, E. W. June 16, 1948, No. 16240. [Class 86] Apparatus for entraining filter aid or other granular solid material into a liquid comprises a tank 10 provided with a tapering base in which an ejector 21 is fitted the ejector nozzle being surrounded by an annular space to which a regulatable proportion of the supply to the jet can be byepassed. The ejector is connected to a point in the main 40 at a point upstream of a cock or flow restricting device 48, and a pipe 25 opens directly above the ejector 21 and is connected to the main 40 downstream of the cock'48. Filter aid material is placed in the tank 10 together with some of the liquid flowing in the main 40, and with the cock 48 partially closed, the flowing liquid will pass through the ejector and entrain a proportionate amount of filter aid material. By means of a pipe 30, connected to the top of the tank 10 and to a point up-stream of the ejector the pressure in the closed tank is prevented from falling. The proportions of flowing liquid and filter aid may be controlled by cocks 34, 36, 37. Opening the branch controlled by cock 37 allows flowing liquid to enter into the ejector space and thus reduces the amount of filter aid entrained; closing this branch and opening branch 34 ensures that the filter aid material is kept agitated and increases the feed rate. Similarly, cock 36 controls the feed rate of filter aid. A modification is described in which the pipe 25 is vertical and opens into the top of the tank 10 where the mixture 01 liquid and filter aid is drawn off.