RU2503490C1 - Hydraulic mixer for water treatment by coagulants - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to water treatment in whatever industry. Proposed mixer comprises tube length with cylinder to house turbulence promoter grate, reagent distributor composed of ring with distribution tubes and conical tank with perforated radial tubes. It differs from known designs in that said cylinder is mounted at tube length centre and features diameter larger that length proper. Said turbulence promoter grate is composed of vertical and horizontal rods. Said rods have coiled tape with alternate LH and RH coiling. Circular manifold connected with reagent feed pipe has holes made on its inner surface, their diameter increasing downward. Said manifold is connected with reagent accumulator by distribution tubes and has bush secured at its centre at the left side and orifice. Perforated cylinder with tank is arranged at the right and coaxially inside conical tank whereto radially connected are distribution tubes with ends plugs and openings.

EFFECT: improved coagulation.

2 cl, 4 dwg

Description

The invention relates to the field of mixing and dissolving liquids and may be applicable in water treatment and other industries. A device for swirling a stream is known, comprising a spiral section located on the inner surface of the pipeline with increased hydraulic resistance, made in the form of a strip with a roughness greater than the roughness of the inner surface of the pipeline (AS No. 1560844, USSR).

The known device does not provide sufficient mixing of liquids with a coagulant without additional devices for this purpose. A top distributor of water-conditioning high-speed filters is known, including a perforated cylinder located in a water cushion and a collector for supplying source water, and it is equipped with an additional cylinder mounted coaxially inside the main cylinder and connected to the collector by means of distribution tubes opposite to one another (AC No. 493233, USSR).

The known switchgear in a moving water stream is inefficient to use as a mixer.

The closest to the invention in terms of technical nature and the achieved result is a hydraulic mixer for treating water with coagulants and flocculants, containing a pipe, a turbulator and a reagent distributor placed inside it, made in the form of radial tubes with holes, the turbulator being installed in front of the distributor (AS No. 904755, USSR) .

The known hydraulic mixer does not sufficiently improve the coagulation process due to insufficient swirling and turbulence of the water flow moving through the pipe.

The objective of this technical solution is to improve the coagulation process due to additional devices that ensure swirling and turbulence of the water flow moving through the pipe.

The task is achieved by the fact that the proposed hydraulic mixer for treating water with coagulants, containing a pipe segment with a cylinder, a turbulent grid placed in it, a reagent distributor made in the form of a ring with distribution tubes, a cone-shaped tank with radial tubes with holes, according to the invention, a cylinder installed in the middle of the pipe segment with a diameter larger than the segment itself.

The turbulator lattice is made of vertical and horizontal rods having a twisted tape attached to the latter from above, with alternating twists, right and left. The annular collector is connected to the reagent supply fitting, has openings on the inner surface, the diameter of which increases downward, and is connected to the reagent storage by distribution tubes. The drive has a sleeve attached to it in the center on the left and calibrated holes, and on the right there is a perforated cylinder with holes installed coaxially inside the cone-shaped tank with holes, radially attached to the distribution tubes having end caps and holes. Inside the pipe segment to the cylinder there is a spiral section with increased hydraulic resistance, made in the form of a strip with a roughness greater than the inner roughness of the pipe with a right twist, and after the cylinder an identical strip with a left twist is made.

The drawings show a hydraulic mixer for treating water with coagulants, where in Fig. 1 is a sectional general view of the mixer, in Fig. 2 is a section A-A, a grill-turbulator, in Fig. 3 is a section B-B, a reagent dispenser and 4 is a device for supplying reagents. The hydraulic mixer for treating water with coagulants contains a pipe segment 1, in the middle part of which a cylinder 2 of a diameter larger than pipe 1 is installed. In the cylinder 2, a turbulizer grid 3 is installed with vertical rods 4 and horizontal rods 5 having a twisted tape 6 attached to them from above with alternating twists (right and left). A device for supplying reagents from an inlet fitting 7 connected to an annular collector 8 having openings 9 and distribution tubes 10 attached to a reagent storage tank 11 having a sleeve 12 attached to it in the center and a calibrated hole 13, and a perforated cylinder 14 with holes on the right 15, mounted coaxially inside a cone-shaped tank 16 with openings 17, radially attached to distribution tubes 18 having end caps 19 and openings 20. Inside the length of pipe 1 to cylinder 2 is placed with iralevidny portion 21 with an increased flow resistance, made in the form of a strip with a roughness greater than the roughness of the inner tube 1 from the right twist, and after the cylinder 2 is identical with strip 22 left twist. The calibrated hole 13 is performed based on the flow of treated water 10-15% of the total.

The flow rate V ₁ and pressure p ₁ to the cylinder 2 from the calculation of the continuity of the jet will look as follows.

V ₁ p ₁ = V ₂ p ₂ = V ₃ p ₃ ,

where V ₂ is the flow rate in cylinder 2,

p ₂ - flow pressure in the cylinder 2,

V ₃ - flow rate at the outlet of the pipe 1,

p ₃ - flow pressure at the outlet of the pipe 1.

As you can see, in the cylinder 2, V ₂ decreases, and the pressure p ₂ increases, which contributes to mixing due to the splitting of the turbulence of the stream, its turbulence increases and intensive mixing of water with coagulants occurs. At the exit of the cylinder 2, the mixing does not weaken, but increases due to the swirling of the stream with tape 22.

In the annular collector 8, the holes 9 are made in its inner part based on the calculation of the output of the coagulant jet at an angle of 90 degrees to the flow of treated water. The diameter of the holes 9 increases to the bottom of both half rings of the collector 8 based on the output of coagulant 20% of the total.

From the holes 17 made in the cone-shaped tank 16, the output of the coagulant is assumed to be 40% of the total, and from the holes 20 of the distribution tubes 18, the output of the coagulant is also assumed to be about 40% of its total.

The holes 20 in the distribution tubes 18 are located symmetrically with respect to the axis of the pipe 1.

The hydraulic mixer operates as follows.

The water to be treated with the reagent in the pipe section 1 due to strip 21 receives a large swirl, for example, clockwise, passing through a turbulent grate 3, where vortices are formed and small twists form horizontal rods 5 with twisted tape 6, which significantly increases flow turbulence . 10-15% of the water flows through the sleeve 12 and the hole 13 into the reservoir 11 and mixes with the reagent. 90% of the water penetrates through the reagent air curtain entering through the openings 9 of the manifold 8, hits the distribution tubes 10 with the formation of additional vortices, mixes with 20% of the reagent, then flows around the reservoir 16 and distribution tubes 18, mixes with the remaining 80% of the reagent, partially already mixed in the tank 16. At the outlet of the mixture from cylinder 2, it receives a counterclockwise twist due to strip 22 and leaves the pipe segment 1.

The proposed device can significantly improve the coagulation process compared to known mixers by 15-20%.

Claims (2)

1. A hydraulic mixer for treating water with coagulants, containing a pipe segment with a cylinder, with a turbulent grate placed in it, a reagent distributor made in the form of a ring with distribution tubes, a cone-shaped tank with radial tubes with holes, characterized in that the cylinder is installed in the middle parts of a pipe segment with a diameter larger than the segment itself, the turbulator lattice is made of vertical and horizontal rods having a twisted strip attached to the last from above, with alternating twists Oh, right and left, the annular collector connected to the reagent supply fitting has holes on the inner surface, the diameter of which increases downward, is connected to the reagent storage by distribution tubes, having a sleeve attached to it in the center and a calibrated hole, and a perforated cylinder on the right with holes mounted coaxially inside a cone-shaped tank with holes to which distribution tubes having end caps and holes are radially attached. 2. The hydraulic mixer according to claim 1, characterized in that inside the pipe segment to the cylinder there is a spiral section with increased hydraulic resistance, made in the form of a strip with a roughness greater than the internal roughness of the pipe with a right twist, and after the cylinder an identical strip with left spin.

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