RU2345815C2 - Device to purify service water of suspended particles - Google Patents

Abstract

FIELD: mechanics, chemistry.

SUBSTANCE: proposed device comprises a partition representing overlapping parallel plates arranged at the angle of 40 to 55° to a horizontal plane, the plates upper edges being inclined towards the flow. Every next plate is spaced apart from the previous one by the distance equal to 0.8 to 1.0 of the plate width. The previous plate lower edge is overlapped by the nest plate upper edge by the value equal to 0.1 to 0.2 of the plate width.

EFFECT: changing suspended particle travel direction into descending one and increasing sedimentation efficiency.

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Description

The invention relates to techniques for purifying water from suspended particles under the action of hydrodynamic forces and gravity in a liquid medium, can find application in mineral processing and technological water purification.

Known thin-layer hydroclassifier (Aut. St. USSR No. 1172578, class B01D 21/24, 08/15/85. Bull. No. 30) [1], comprising a housing with packages of inclined wave-like plates, a receiving pocket, an inclined dividing wall, supply and sludge discharge channels located at the crests and troughs of the plates, a collection pocket with an overflow threshold for the withdrawal of purified water, vertical partitions of the supply channels and overflow channel flaps for regulating the input and output flows.

The disadvantage of the classifier is the overgrowth of interplate gaps in the package with sludge, as sludge is deposited in the oncoming liquid stream.

A thin-layer sump is known (Aut. St. USSR No. 1223955, class B01D 21/24, 04/15/86. Bull. No. 14) [2], in which the inlet channel is closed by a soothing grid, the supply channels are equipped with fairings, and the sludge channels are blocked by a partition .

Thin-layer sedimentation tank has the same drawback as the previous analogue, overgrowing of interplate gaps.

Known thin-layer sump [3], made in the form of a filter partition such as blinds, the plates of which are installed at an angle of 50-75 ° to the horizontal plane and overlap each other to change the direction of the longitudinal flow of water upward and create conditions for more intensive deposition of particles on the plates.

The disadvantage of this device is the ability to balance the speeds of the upward flow and the sliding of particles deposited on the plates, which leads to their clogging.

The closest technical solution adopted for the prototype is a thin-layer sump [4], which contains plates tilted upstream, overlapping each other, while they form a "triple" in which every third is at the level of the first, and together they overlap only the upper part of the channel, the lower part remains free for overflow. A “boundary layer” is created at the surface of the water, in which the water velocity drops to zero, and the water of the lower stream, saturated with suspensions that have fallen from the “boundary layer,” leaves the outlet.

The aim of the invention is the creation of a stationary mode of flow of the water stream and the intensification of the deposition of suspended particles for water purification during the movement of the stream.

The solution to this problem is achieved by the fact that in the process water purification device the plates are installed at an angle of 40-55 ° to the horizontal plane, each subsequent plate is separated from the previous one by a distance equal to 0.8-1.0 of the plate width, and the lower edge of each previous plate is overlapped by the upper edge of the subsequent plate height by an amount equal to 0.1-0.2 of the width of the plate.

The operation of the device is illustrated by drawings, where Fig. 1 is a front view of the device, Fig. 2 is a sectional view of the device along line AA, Fig. 3 is a plot of the final velocities on their size and density in accordance with the law combining the laws of Stokes, Allen, Rittinger.

The device is a jumper installed in the channel or sump, assembled from plates, which includes: transverse plates 1 (flat or profile) for sedimentation of sludge, mounted parallel to each other at an angle to the horizontal plane of 40-55 ° with the inclination of the upper edges to meet the flow; spaced and overlapping each other in height, housing 2.

The jumper covers the entire section of the channel from the surface to the depth of the active movement of water, with the exception of the zone of sedimentation of sludge Δh. The plates are inclined towards the flow of water at an angle selected from the range of 40-55 °, the same for all plates.

The distance between the plates is selected from the conditions of free movement of water (minimum hydraulic resistance).

As an example, the calculation of the strip width for the deposition of coal and rock particles at a water leakage rate of V = 0.47 m / s is given.

The calculated data are given in the table.

Sizes of width of strips (blinds) Length m d, μm 1000 500 one hundred thirty 10 5 L, m for
ρ _m = 1350 kg / m ³ (coal)

L, m for
ρ _m = 2650 kg / m ³ (rock)

Note: the numerator shows the calculated data, the denominator shows the rounded design dimensions of the width of the strip

The operation of the device is as follows.

The water flow runs sequentially onto the plates with a speed V divided into two, the lower one is reflected in the direction of the bottom, and the upper part of the stream, depending on its speed, can go around the plates and carry away part of the suspended particles that are delayed by the following plate partitions, which have a smaller plate size and gaps between them.

The final particle reflection velocity (Fig. 3) when meeting with the septum strip increases due to the angle of reflection from the plate and the centrifugal force arising from the rotation of the water deviated from the plate around the lower edge of the plate. The particle is reflected from the plate into the lower layer of water flowing onto the subsequent plate, and then the process re-occurs, which intensifies the deposition of particles and clarification of the water. The flow in the channel (sump) occurs in a quasi-stationary mode.

In the device, the energy of water movement is used to force the deposition of suspended particles to the bottom of the sump. There is no need to classify sludge by size, but it is enough to install two or three devices in series with different plate widths and gaps between them.

Comparison of the proposed solutions with the prototype and other similar solutions in this technical field gives reason to assert that it meets the criteria of "Novelty" and "Inventive step".

LITERATURE

1. USSR copyright certificate No. 1172578. Thin-layer gndroklassifikator M. kl ³ . B01D 21/24, 08/15/85. Bull. No. 30.

2. USSR copyright certificate No. 1223955. Thin-layer sedimentation tank. M. cl ³ . B01D 21/24, 04/15/86. Bull. Number 14.

3. RF patent №2162004. The method of clarification of technological water in underground catchments with mechanized treatment. / V.V.Senkus, S.G. Fomichev, Vas.V. Senkus, K.S. Fomichev. M. cl ³ . B01D 21/02. Claim 11/06/1998. Publ. 01/20/2001. Bull. No. 2.

4. DE patent No. 213801 A, cl. B01D 21/00 of July 26, 1907. Thin-layer sedimentation tank.

Claims (1)

A device for cleaning process water from suspended particles, including a housing, a partition made in the form of parallel plates installed with gaps to each other at an angle to the horizontal plane, the plates inclined with the upper edge towards the flow, and the lower edge of each previous plate overlapped by the upper edge of the subsequent plates, characterized in that the plates are installed at an angle of 40-55 ° to the horizontal plane, each subsequent plate is separated from the previous one by a distance equal to 0.8-1.0 of the width of the plate slime, and the lower edge of each plate is covered previous upper edge of the plate followed by adjustment by an amount equal to 0.1-0.2 the plate width.

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