RU207722U1 - Device for mixing coagulum with water - Google Patents

Abstract

The utility model relates to the field of water treatment of natural and waste waters and can be used to prepare solutions of coagulants. The device for mixing the coagulant with water consists of a body, inside which there is a working chamber for the formation of a swirling mixture of water and coagulant. The working chamber is connected to the body on each side by couplings by means of a thread and has tangential inlet channels for water supply and a coagulant supply channel located coaxially along the center of the fluid movement axis. In addition, the working chamber passes into the mixing chamber by means of a confuser. The device provides fast and at the same time uniform mixing of the coagulant in the entire volume of the treated water due to the use of cavitation resonance effects and simplification of the design with an increase in the reliability of the device for mixing the coagulant as a whole. 1 ill.

Description

The utility model relates to the field of water treatment of natural and waste waters and can be used to prepare solutions of coagulants.

Known is a coagulant distributor for water treatment (patent RU No. 2652706, B01F 3/00, C02F 1/52) containing a beam distributor formed from radially arranged perforated tubes. The holes are directed along the flow of water entering a part of the tank.

The disadvantage of this device is the technical solution associated with the location between the holes of the protruding hook-shaped strips, bent along the water flow at an angle to it, forming ridges, each of which is located above the corresponding hole with the ability to reflect part of the water to the coagulant supplied from this hole. As a result, the mixing effect at each section of the coagulant supply will be uneven throughout the volume of the treated water. This requires additional equipment for dosing the coagulant. Also, a perforated tube in the form of a beam distributor causes significant hydrodynamic resistance to the flow of treated water.

Known centrifugal cleaning device (patent RU No. 193 149, B01D 21/01, B01D 21/08, B01D 21/26, C02F 1/52), consisting of a housing with a horizontal axis, made in the form of a spiral diffuser channel. The contaminated liquid supply (initial) branch pipe is located tangentially to the body and is connected to the purified (clean) liquid outlet branch pipe and the sludge removal branch pipe. The upper end of the spiral diffuser channel is connected to one free end of the coagulant supply device made in the form of an ejector connected in a narrow section to the coagulant supply pipe. A mixing chamber is located between the upper end of the spiral diffuser channel and the free end of the coagulant supply device, inside which a coaxial screw is located.

The disadvantage of the claimed device is the lack of uniformity of mixing of the added coagulant with the treated water in view of the fact that the addition of the coagulant occurs on one side of the pipeline, and turbulization of the combined flow of water and coagulant acts as a mixing element when passing through the auger channels in the mixing chamber.

The closest in technical essence and the achieved result (prototype) is a device for mixing a coagulant with water (patent RU No. 88010, C02F 1/36, C02F 1/52), containing a main pipeline, inside of which a pipeline for supplying chemical reagent, the end of which is connected to a branch pipe for horizontal introduction of a chemical reagent, and a pipe for supplying water under pressure with a manifold on which hydroacoustic emitters are installed for supplying water to the main pipeline.

The disadvantage of the claimed device is the uneven mixing of the added chemical reagent throughout the volume of the treated water flow, associated with the method of capturing the added reagent by turbulent jets as a result of the operation of hydroacoustic devices, as well as the need to use additional technological equipment in order to maintain the required operating parameters of the hydroacoustic emitters in the main pipeline and dosing of a chemical reagent into the main pipeline.

The technical task of the proposed utility model is the development of a device for uniform and rapid mixing of a coagulant (aluminum salt, titanium salt) with water.

The problem is solved by developing a device that simultaneously combines the process of ejection and dispersion of the coagulant added to the water, based on the generation of pressure pulsations in the treated medium by means of converting the energy of the flow of the treated water (Fig. 1).

FIG. 1 shows a device for mixing water with a coagulant (aluminum, titanium salts).

A utility model for mixing a coagulant with water consists of the following elements:

The body (9), inside of which the working chamber (2) is located, connected to the body on each side by special couplings (5 and 6) by means of thread, having tangential inlet channels (3) for water supply and a channel (4) for coagulant supply, located coaxially along the center of the axis of fluid movement and passing into the mixing chamber (8) by means of the confuser (7).

In this case, the coupling (5) is connected by means of a thread to the coagulant supply pipe, the coupling (6) is connected to the treated water discharge pipeline, and the remaining free opening of the outer housing (9) is connected to the feed line of the initial water.

The utility model works as follows.

A liquid under a pressure of at least 0.45 MPa is supplied to the inlet to the hydrodynamic device (1), through the tangential inlet channels (3) of the working chamber (2), which facilitate the flow of water tangentially to its inner cylindrical surface, twisting and drawing the flow into rotational motion , due to the centrifugal force, forming a region of reduced pressure along the axis of the working chamber (2), contributing to the controlled supply of the coagulant solution by gravity into the working chamber through the channel (4) located coaxially along the center of the axis of motion of the swirling liquid flow moving further through the confuser (7) with a sharp drop in pressure in the mixing chamber (8). The ratios of the internal geometric parameters of the tangential channels (3), the working chamber (2), the confuser (7), the mixing chamber (8) and the hydrodynamic characteristics of the water flow provide cavitation resonance phenomena in the treated water, contributing to additional mixing of the added coagulant.

The proposed design of the utility model has a number of advantages over known devices:

increase in efficiency due to the uniformity of mixing of water with a coagulant;

increasing the speed of the process;

reducing the consumption of coagulant;

reduction in costs associated with the simplicity and reliability of the design.

Example 1

Initial water, with parameters: the content of suspended solids 12.6 mg / l with a linear speed of 27-29 m / s is supplied to the inlet to the hydrodynamic device (1) through the tangential inlet channels (3) of the working chamber (2). Into channel (4) through coupling (5), an 8% solution of aluminum sulfate (coagulant) in the amount of 8 mg / l (in terms of the active component) is fed into the working chamber (2) through channel (4). Then the swirling mixture moves through the confuser (7) with a sharp drop in pressure into the mixing chamber (8). At the outlet, the content of suspended solids is 0.4 mg / l. To achieve comparable efficiency without using a hydrodynamic mixer, an effective dose of 8% aluminum sulfate - 10 mg / l (based on the active component).

Example 2

Initial water, with parameters: the content of suspended solids 12.6 mg / l with a linear speed of 27-29 m / s is supplied to the inlet to the hydrodynamic device (1) through the tangential inlet channels (3) of the working chamber (2). Into channel (4) through coupling (5), a controlled supply of a 1% solution of titanium tetrachloride (coagulant) in an amount of 4 mg / l (based on the active component) is carried out into the working chamber (2) through channel (4). Then the swirling mixture moves through the confuser (7) with a sharp drop in pressure into the mixing chamber (8). At the outlet, the content of suspended solids is 0.32 mg / l. To achieve comparable efficiency without using a hydrodynamic mixer, an effective dose of a 1% titanium tetrachloride solution of 5 mg / l (based on the active component).

Claims (1)

A device for mixing a coagulant with water, including a housing, inside which a working chamber is located for the formation of a swirling mixture of water and a coagulant, connected to the housing on each side by couplings by means of a thread, having tangential inlet channels for water supply and a coagulant supply channel located coaxially in the center the axis of fluid movement, and passing into the mixing chamber by means of a confuser.

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