SU1643473A1 - Apparatus for aeration of water - Google Patents

Abstract

The invention relates to the mixing of liquids with gases. The aim of the invention is to intensify the aeration process and reduce energy consumption. The device contains a water supply pipe 1, passing into an external confuser 2 with a cylindrical mixing chamber 3, ending with a diffuser 4, an internal confuser 5 with a cylindrical mixing chamber 6. Inside the confuser 5, there is an air inlet pipe 7 at its outlet, the outlet of which is fixed to cavitation an element in the form of a diffuser 8. Between the internal confusion 5 and the air intake pipe 7, as well as between the external 2 and internal confusion 5, are located

Description

The invention relates to the mixing of liquids with gases and can be used, in particular, in the biological treatment of wastewater,

The aim of the invention is to intensify the aeration process and reduce energy costs.

Figure 1 shows the device, a longitudinal section; figure 2 - node I in figure 1; on fig.Z - section aa in figure 2; figure 4 - section bb in figure 2.

The liquid aeration device comprises a water supply pipe 1, which passes into an external confusor 2 with a cylindrical mixing chamber 3, ending with a diffuser 4. Coaxially with an external confusor 2, an internal confuser 5 is located, ending with a cylindrical mixing chamber 6,

Inside the confuser 5, the air intake pipe 7 is L-shaped, coaxially placed at it, at the outlet of which a cavitation element is fixed, made in the form of a diffuser 8. Spinning spirals are located between the internal confuser 5 and the air outlet pipe 7, as well as between the external 2 and internal 5 confusors. blades 9 and 10, which have a wedge-shaped profile with a sharp leading edge (supercavitating profile), are in opposite directions. In the body of the blades 9 and 10, the channels I and 12 are connected, communicating with each other and with the air inlet pipe 7 and extending to the back side of the blades

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A device for aeration of water works as follows.

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Water is supplied through the supply pipeline t to confusors 2 and 5, divided into two streams: external and internal. In confusers, the flow velocity increases, reaches the required value (10-15 m / s), and the static pressure drops. During flow past the blades 9 and 10, respectively, by internal and external streams of water, they twist in opposite directions. The supercavitating profile of the blades causes the formation of attached advanced cavitational cavities behind them (supercover), in which pressure is less than partial pressure. gas-induced flares. The pressure difference in the supercavity cavity and in the intake manifold 7 causes air to be injected through channels II and 12 ". In the highly turbulized tail sections of the cavities, air microbubbles form and detach themselves. Thus, the blades create a two-phase dense a packaged water-air mixture. When flown around by an internal flow consisting of water and air-filled bubbles of the diffuser 8, an attached cavern is also formed. The presence of air microbubbles in the flow The formation of a stable cavity with minimal energy costs. The difference in static pressures in the flow of water and in the cavitation cavity behind the diffuser 8 causes air injection. Carrying out of gas through the tail part of the cavity with the formation of fields of cavitation bubbles, as well as the diffusion of air through the interface (phase of the cavity) contributes to the constant injection of air into the cavity of the cavity, and

consequently, water saturation with oxygen. By the cavitation element in the mixing chamber 6, as a result of an increase in the static pressure, a part of the cavitation bubbles collapse and the air inside them dissolves in the water. The outer-curved cavitation of the cavitation bubbles is in opposite directions. and the internal flow coaxial with it, coming out of the mixing chamber 6, occurs in the mixing chamber 3. As a result, the interaction of two oppositely twisted flows in chamber 3 causes a sharp and the turbulence of water flow, which leads to active collapse-cavitational puffs over the entire flow section with the formation of cumulative microstructures, whose speed reaches 1000 - .1500 m / s, and the pressure at the points of the collapse - E1NII (10 - 15) . O2 Mllao

Due to the cavitational-cumulative effect, intensive mixing and dissolution of air in the water solution occurs. In the diffuser 4 the kinetic flow is converted into a potential flow with decreasing speed and increasing static pressure, which contributes to the further transformation of the two-phase mixture into a single-phase one.

Making the blades 9 and O of a wedge shape in cross section with a sharp leading edge, and the cavitation element in the form of a diffuser 8, allows to obtain a developed contact surface of two phases (air - water), the value of which can be regulated as a change in the geometry of the cavitators (angle of attack, pitch blades and the degree of blocking flow) 9 and hydrodynamic

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With these flow characteristics (speed and pressure) c, the Supercavitating profile of the blades and the shape of the cavitation element in the form of a diffuser 8 also provide minimal hydraulic losses and, consequently, a decrease in energy costs when implementing hydrodynamic cavitation modes,

Claims (1)

The invention allows to increase the degree of purification of wastewater. The formula of the invention 1 o A device for aeration of water, containing water supply and air intake pipelines, coaxially arranged external and internal conicors with cylindrical mixing chambers, a diffuser installed at the outlet of the cylindrical mixing chamber of the external confuser $ and located between the air intake pipe and the internal confuser, as well as between the internal and external confusors, the blades rotating in opposite directions with the air inlet channels communicating with the air intake pipeline r o r ™ $ chto8s lichayuschees the target - process intensification aerating and reducing energy costs, it is provided with the cavitation element mounted on a cart duhozabornogo outlet conduit zakruchivayuschies blade formed with a tapered Profi. Lem in cross section and with a sharp front edge, and the channels in the blade are made with access to the back side of the latter 20. A device according to claim 1, in which the cavitation element is designed as a diffuser. gi-ch A. S1 Figure 2 Phie.E FIG.