RU2461739C1 - Multi-stage air lift - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: air lift includes in-series located stages each of which has vertical suction device 2, arranged in fluid receiver, mixer, lifting pipe 4, air duct 5 and air separator with drain pipe connected to receiver of the next stage. Mixer is made in the form of perforated pipe 9 located near pipe 4 changed into convergent nozzle 11 with inner curved grooves 12 connected by means of clamp 10. On pipe 4 end there installed is downward divergent head piece 13 with curved screw-shaped guides 14, and inside it there provided is bimetallic polyhedron 15. Grooves 12 in nozzle 11 have direction of tangent in clockwise movement direction, and guides 14 on inner surface of head piece 13 have counter-clockwise direction of tangent.

EFFECT: efficient operation during long periods due to preventing the sticking of solid contaminations in cavities of grooves and on surfaces of guides by formation of micro swirls and micro explosions at availability of two opposite directed swirled vortex flows.

6 dwg

Description

The invention relates to hydraulic lifting and hydrotransport devices designed for pumping hydraulic mixtures through horizontal mine workings, in particular, to the construction of a multi-stage airlift, and can be used in mining, mining, energy, land reclamation, water supply systems and other industries.

Known multi-stage airlift (see AS No. 885633, MKI F04F 5/24, bull. No. 44, 1981), containing successively arranged stages, each of which has a vertical suction device, a mixer, a lifting pipe, an air duct located in the liquid receiver and an air separator with a drain pipe attached to the receiver of the next stage, and the lift pipe of each stage is located at an angle not exceeding 60 ° to the axis of the suction device, and the drain pipe of each stage has a slope of 10 ... 20%.

The disadvantage of this step airlift is its low efficiency due to the impossibility of completely mixing the supplied air with the transported liquid.

Known multi-stage airlift (see RF patent No. 2161739 IPC F04F 1/18 publ. 10.01.2001 bull. No. 1), containing successively arranged stages, each of which has a vertical suction device located in the liquid receiver, a mixer, a lifting pipe, an air duct and an air separator with a drain pipe connected to the receiver of the next stage, the lift pipe of each stage being located at an angle not exceeding 60 ° to the axis of the suction device, and the drain pipe has a slope of 10-20%, while the mixer is made in the form of a perforation An unbroken pipe located next to the lifting pipe, turning into a tapering nozzle with internal curved grooves connected by a bent bracket, an extension expanding at the bottom of the lifting pipe with curved helical guides is installed, and a bimetal polyhedron is provided inside it, the cross-section of which is a quadrangle in which two opposite sides are parallel and the other two are perpendicular to each other, at the end of the drain pipe but a flexible perforated ring laid on the bottom of the fluid receiver.

The disadvantage is the decrease in the efficiency of transportation of the slurry during prolonged use due to the adherence of solid particles in the cavities of the curved / filamentous grooves and on the surfaces of the curved helical guides, which increases the hydraulic resistance of the nozzle and nozzle mounted on the end of the lifting pipe.

The technical task of the invention is to maintain effective operation during long-term operation by preventing the buildup of solid contaminants in the cavities of curved helical grooves and on the surfaces of curved guides by the formation of micro-eddies and microexplosions in the presence of two counter-directed swirling vortex flows.

The technical result is achieved in that the multi-stage airlift contains successively arranged steps, each of which has a vertical suction device located in the liquid receiver, a mixer, a lifting pipe, an air duct and an air separator with a drain pipe attached to the receiver of the next stage, and the lifting pipe of each stage is located to the axis of the suction device at an angle not exceeding 60 °, and the drain pipe has a slope of 10-20%, while the mixer is made in the form of a perforated pipe, ra located next to the lifting pipe, turning into a tapering nozzle with internal curved grooves connected by a bent bracket, an extension expanding at the bottom of the lifting pipe with curved helical guides is installed, and a bimetal polyhedron is provided inside it, the cross section of which is a quadrangle, in which two opposite sides are parallel and the other two are perpendicular to each other, flexible perforation is installed at the end of the drain pipe a ring placed on the bottom of the fluid receiver, while in a tapering nozzle, the internal curved helical grooves have a tangent direction in the clockwise direction, and the curved helical guides on the inner surface of the expanding nozzle have a tangent direction counterclockwise.

Figure 1 shows a longitudinal section of a multi-stage airlift; figure 2 is a schematic diagram of a mixer in section aa; figure 3 - section of the mixer; figure 4 is a scan of the inner surface of the narrowing nozzle with internal curved helical grooves, the tangent of which has a direction in the direction of clockwise movement; 5 is a diagram of a bimetallic polyhedron; Fig.6 is a scan of the inner surface of the nozzle with internal helical grooves, the tangent of which has a direction counterclockwise.

The multi-stage airlift contains successively arranged steps, each of which has a vertical suction device 2 located in the liquid receiver 1, a mixer 3, a lift pipe 4, an air duct 5, an air separator 6 with a drain pipe 7 connected to a receiver 8 of a subsequent stage, the lift pipe 4 of each steps is arranged to the axis of the suction device 2 at an angle not exceeding 60 °, and the drain pipe 7 has a slope of 10 ... 20%. Near the lifting pipe 4 there is a perforated pipe 9, connected by means of a bent bracket 10 with a narrowing nozzle 11 to the internal curved helical guide grooves 12, the tangent of which has a clockwise direction (see page 509 Vygodsky M.D. higher mathematics. - M.: 1965 - 872 pp. ill.). At the end of the lifting pipe 4, a nozzle 13 expanding downward is installed with curved helical guides 14, the tangent of which has a counter-clockwise direction. Inside the riser pipe 4, a bimetallic polyhedron 15 is placed, the cross section of which is a quadrangle, in which two opposite sides 16 are parallel and the other two 17 are perpendicular to each other. The bimetallic polyhedron 15 is made of a plate, is hollow, the upper 18 and lower 19 ends are open for fluid passage. The drain pipe 7 is attached to a flexible perforated ring 20 laid on the bottom 21 of the receiver 8.

Multistage airlift works as follows.

When compressed air is supplied under pressure from a compressor (not shown), which has the ability to suck in air periodically with different temperatures in the shaft, a multiphase deep emulsified and dispersed mixture is formed into the duct 5 in the mixer 3 due to the uniform distribution of air when leaving the openings. Moreover, the holes in the perforated pipe 9 are arranged with a varying pitch and diameter in height on the surface. In the entire volume in the receiver 1 there is a complete mixing of air with a hydraulic mixture, the bulk mass, its density decreases. A significant part of the air through the bent bracket 10, the tapering nozzle 11 with the internal curved helical grooves is twisted, forming a vortex-like movement in the clockwise direction, enters the riser pipe 4 with a bimetallic polyhedron 15, a cross section that is a quadrangle with two opposite sides 16 are parallel, and the other two 17 are perpendicular to each other. The bimetallic polyhedron 16 is made of a plate, is hollow, the upper 18 and lower 19 ends are open for fluid passage. Bimetal polyhedron is not a volumetric element. The narrow parallel side 16 exhibits the property of the frame and maximally contributes to the deformation of the wide perpendicular side 17 due to the bimetallic properties of the polyhedron 15 in the horizontal direction.

The rest of the air enters the receiver 1 or 8 and mixes with the working medium, while the falling liquid through the drain pipe 7, leaving the perforated ring 20, enhances the movement of the working medium in the receiver 8 and leads to the weighing of solid inclusions. The resulting emulsion under pressure of compressed air enters the lifting pipe 4 through a nozzle with curved spiral guides 14 expanding downward and twisted, forming a vortex movement in the direction counterclockwise and then into the suction device 2, the tapering nozzle 11 with curved spiral grooves 12 and a bimetallic fifteen.

In this case, the emulsion swirling in curved helical guides 14 located on the inner surface of the nozzle 13 expanding downward forms a vortex rotating counterclockwise and, as it moves towards the expanding nozzle 11, begins to contact the flow twisted in curved helical grooves 12, which in the form of a vortex it rotates in the direction of clockwise motion. This leads to the decay of vortices rotating in opposite directions into small microvortices and microexplosions (see, for example, Merkulov V.P. Vortex effect and its application in technology. - M.: Mechanical Engineering, 1969 - 184 pp. Ill.). As a result, both on the surfaces of curved helical guides 14 and in similar curved helical grooves 12, disruption and adhesion of solid particles are observed, ensuring the calculated hydraulic resistance of the nozzle and tapering nozzle and, accordingly, eliminating the occurrence of additional energy costs for transporting the emulsion.

The swirling flow of the emulsion also affects the bimetallic polyhedron 15, pulsating it relative to the middle part in height, which is accepted sufficient for the manifestation of vibration.

Periodic intake of air by the compressor from zones of different temperatures, which always leads to such a distribution of air in the mine due to its ventilation and movement of air masses, as well as the supply of cold ground water to the receivers, and there is no other water in the mine, all of which together exclude the possibility equalization of air temperature and the bimetallic polyhedron 15 and ensures its constant deformation due to the bimetallic properties and aerohydrodynamic forces that make the polyhedron 15 pulsate create a suction effect of the working environment. The perforated flexible ring 20 in addition to stirring and mixing the liquid eliminates the possibility of its reverse current through the drain pipe 7 in the opposite direction.

Creating a deeply emulsified, homogeneous and dispersed working medium in the receiver through the use of an improved mixer design allows a multi-stage airlift to increase its efficiency and efficiency due to a decrease in the hydraulic resistance of the system.

The originality of the proposed technical solution for a multistage air-lift is to maintain operational efficiency during long-term operation by eliminating the increase in hydraulic resistance of a tapering nozzle and nozzle by preventing sticking of solid impurities in the cavities of curved helical grooves and on the surfaces of curved helical guide nozzles by the formation of micro-eddies and microexplosions in contact counter direction vortices obtained ny when moving the emulsion both in the direction and counterclockwise.

Claims (1)

A multi-stage airlift containing successively arranged steps, each of which has a vertical suction device located in the liquid receiver, a mixer, a lift pipe, an air duct and an air separator with a drain pipe connected to the receiver of the next stage, the lift pipe of each stage being angled to the axis of the suction device not exceeding 60 °, and the drain pipe has a slope of 10-20%, while the mixer is made in the form of a perforated pipe located next to the lifting pipe, going into a tapering nozzle with internal curved grooves connected to each other by a bent bracket, a nozzle expanding at the bottom with curved helical guides is installed at the end of the lifting pipe, and inside it there is a bimetallic polyhedron, the cross section of which is a quadrangle in which two opposite sides are parallel and the other two are perpendicular to each other, at the end of the drain pipe there is a flexible perforated ring laid on the bottom of the receiving Single fluid, characterized in that the internal nozzle tapering curved helical grooves have a direction tangentially along the clockwise and curved helical guide on the inner surface of the expanding nozzles are directed tangentially against stroke clockwise.

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