Double-faced coal slurry grading device by utilizing variable tilt angle sloping plates

Abstract

The invention discloses a double-faced coal slurry grading device by utilizing variable tilt angle sloping plates. The double-faced coal slurry grading device comprises a water distribution trough and a grading trough which are partitioned and communicated through a perforating wall, wherein a plurality of variable tilt angle sloping plates are arranged in the grading trough; a positioning supporting beam is arranged on the inner wall of the grading trough; each variable tilt angle sloping plate is embedded in a square frame with an opening in the lower part; the side face middle points of the square frames are connected onto the positioning supporting beam through shafts; the upper ends of the square frames are fixed on a flexible steel rope; the flexible steel rope is connected with a driving device; a sludge-collecting hopper, a mud pipe and a slurry pump are arranged at the lower part of the grading trough, and a water-collecting tank is arranged at the upper part of the side wall of the grading trough. The grading particle size can be adjusted along with the angular variation of the sloping plates; the sloping plates work in double faces, and are uniform in stress and little in deformation; through mechanical forced unloading, the mud is discharged in time, and the device is not suitable for blockage.

Description

technical field [0001] The invention relates to a classifying device for coal slime water, in particular to a coal slime classifying device using inclined plates with variable inclination angles on both sides. Background technique [0002] The terminal velocity of free settling of particles is: [0003] [0004] The final velocity of the particle settling in the particle group is: [0005] [0006] like figure 1 As shown, let the length of the inclined plate be l, and the inclination angle be θ. The rising velocity of particles in the water along the direction of water flow is υ, and the downward sinking velocity under the action of gravity is u 0 . The particle moves along the direction of the sum of the two vectors, and it is considered to be removed when it hits the inclined plate. The sinking velocity of the particle moving from a to b is u 0 , this situation is equivalent to: when the particle rises at the speed of υ (l 1 +l) The time required for the dista...

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Problems solved by technology

[0012] ① Due to the fixed angle of the inclined plate, it is so difficult to adapt to the different requirements of the classification particle size due to changes in the processing capacity and product quality requirements.

②Due to the deformation of the sloping plate, untimely sludge discharge, large amount of flocculant, etc., the phenomenon of blockage between the sloping plates often occurs, resulting in short-circuit flow, so that the residence time of part of the water entering the classification tank is less than the design residence time, and soon overflows out of the tank In addition, the classification cannot be fully classified and the classification efficiency is reduced; the residence time of the other part is longer than the residence time, and may even be very long, resulting in a dead water area where the water flow is basically stagnant, reducing the effective volume of the classification pool, and the dead water area is also prone to algae.

③ The blockage between the plates affects the normal operation of the sloping plates, which significantly reduces the classification effect, and the concentration of the effluent seriously exceeds the standard, deteriorating the water quality

The above problems have greatly affected the normal work of the coal preparation plant, and even caused the entire coal preparation system to be paralyzed.

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