RU2623673C1 - Suspensions hydrotransportation unit - Google Patents

Abstract

FIELD: engine devices and pumps.

SUBSTANCE: unit contains a vessel with a starting suspension, a centrifugal pump, a water jet elevator and a water jet pump. The unit also comprises a device for separating suspensions into a solid and a liquid phase, which is a series of spiral turns composed of pipes and having an inlet and an outlet. The outlet branch is made in the form of a replaceable divider head with two branches and a tongue. One branch is connected to the suction unit of the centrifugal pump, and the second one - to the central passive nozzle of the water jet pump whose active nozzle is connected to the centrifugal pump injection unit. The unit is provided with a water inlet fitting tangentially connected to one of the spiral turns.

EFFECT: creation of a unit that provides high efficiency at low energy costs, reliable operation with a change in the concentration of the solid phase and high productivity, and does not contain wearing rotating parts in contact with the pumped solid phase.

3 dwg

Description

The invention relates to the hydrotransportation of suspensions. Hydrotransport of granular media (suspensions) is widespread in various industries both in Russia and abroad, for example, in the chemical, metallurgical, as well as in the hydraulic industry and irrigation and drainage construction. Mineral resources (coal, ore, etc.) are concentrated in a liquid carrier stream, mainly water, in processing plants, cinder in the sulfuric acid production system, sand during reclamation and deepening of rivers, etc.

One of the main problems of transportation, especially thickened suspensions with an abrasive solid phase, is the wear of pumping equipment. A device for transporting suspensions is known (AS USSR No. 555231, class E04D 13/12, 1975), which contains a cylindrical chamber for separating suspensions, which is mounted for rotation around a vertical axis, is divided by an annular partition and has two rows of windows for solid phase output. The device has a pump, the input of which is connected to the central (passive) nozzle of the water-jet elevator. The active nozzle of the jet pump (or booster) serves to supply clean liquid; passive inlet of the transported (pumped) suspension.

The disadvantages of the device:

- cumbersomeness, including the presence of rotating parts;

- the difficulty of regulation when separating into liquid and solid phases, when changing the flow of the suspension, especially with polydisperse solid particles.

Closest to the proposed invention is a device for transporting suspensions containing a centrifugal pump, a water-jet elevator, a fixed cylindrical housing connected to a water-jet elevator and a centrifugal pump, a conical nozzle located in its internal volume, equipped with a rotational drive around a vertical axis. The device has a liquid phase receiver mounted at the junction of the cylindrical and conical parts of the housing. On the peripheral part of the conical nozzle are two separation devices, the upper of which is in communication with the receiver of the liquid phase, to which, in turn, the cylindrical and conical chippers are attached. A cylindrical cup is installed above the conical atomizer (RF patent No. 2212566, 09/20/2003, IPC F04D 13/12, F04D 29/70).

The disadvantages of this device:

- The complexity of the design, due, inter alia, to the presence of rotating parts, and high energy consumption.

- Difficulties in ensuring the transfer of the device to work from one suspension performance to another.

- It is practically impossible to use suspensions with a polydisperse phase, which has large particles, which can clog the gaps between the cylindrical and conical parts during transportation.

The objective of the invention is the creation of an aggregate for the transportation of suspensions, providing high efficiency at low energy consumption, reliability, high enough performance and eliminating the above disadvantages.

The problem is achieved in that in the unit for the hydrotransport of suspensions containing suspension feeding devices, devices for separating suspensions into solid and liquid phases, a centrifugal pump, a water-jet elevator, according to the invention, the suspension separation device is a series of connected spiral coils made of pipes, having an inlet and outlet nozzles, the outlet nozzle being made in the form of a replaceable separator head with two taps and a tongue, an input nozzle in rows tangentially connected to one of the spiral turns of a replaceable head outlet separator connected to the suction of centrifugal pump assembly, and the second - the passive nozzle the central water pump, the centrifugal pump pumping node connected to its active nozzle.

In FIG. 1 shows a diagram of a unit for transporting suspensions; in FIG. 2 is a diagram of a replaceable separator head with taps and tongue; FIG. 3 - section of a complex of 3 spiral turns.

The slurry hydrotransportation unit contains a container 1 with an initial suspension, a water-jet elevator 2 and a water-jet pump 3, a series of spiral-connected spiral turns 4 made of pipes, a centrifugal pump 5, a replaceable separator head 6 with two taps “a” and “b” and tongue “C”, water inlet pipe 7, tangentially connected to one of the spiral turns.

The unit operates as follows.

The suspension (g) to be transported from the original tank 1 enters the inlet of the water-jet elevator 2 through a central passive nozzle. The flow of the suspension is accelerated due to the vacuum created in the pump using a high-speed flow of water (e) through the active nozzle. A sharp decrease in pressure leads to an increase in the flow rate from the tank 1 through the water-jet elevator 2. The length of the main section 8 transporting the suspension is calculated based on the pressure head obtained at the outlet of the water-jet elevator 2. Next, the high-speed stream of the suspension passes through complex 4, consisting of connected spiral coils made of pipes.

When moving along the spiral channels of complex 4, the suspension flow under the action of centrifugal forces is divided into solid and liquid phases. The number and size of spiral turns depends on the dispersion of the particles of the solid phase in the suspension and the pressure in the main system. To increase the intensity of separation of the suspension, to increase the centrifugal force acting on the particles, a nozzle 7 for supplying the accelerating liquid — water — is tangentially mounted on one of the spiral turns.

The output pipe of the latter in the direction of the suspension of the spiral coil of complex 4 is an installed interchangeable separator head 6 with tongue. The flow of the solid phase (e), formed under the action of centrifugal forces, on one part along the length of the pipe, enters through the outlet of the separator head to the inlet of the water-jet pump 3 through a central passive nozzle. The liquid phase through the second outlet is fed to the suction unit of the centrifugal pump 5, from where it is pumped to the active nozzle of the water-jet pump 3.

Replaceable head-separator 6 has in the Central part of the tongue, which serves to separate streams. Interchangeable heads differ in the position of the tongue. Thus, in this unit for transporting suspensions, the kinetic energy imparted to the initial phase by a centrifugal pump is further converted to transport the solid phase through pipeline 9, increasing its speed. Similarly, from a water-jet elevator 2 through line 8. The outlet pressure exceeds the pressure of the passive medium at the inlet. The liquid flow rate through the active nozzle depends on the ratio of the pressure of the media at the inlet and on the required pressure at the outlet of the water-jet pump. The latter determines the length of the main pipeline to the next slurry separator.

The separator head 6 is removable. The heads differ in the position of the tongue in the central zone and the diameter of the pipe, which is necessary when changing the concentration of the solid phase in the suspension or switching to the transportation of suspensions of a different type.

The proposed unit is quite simple, low energy, does not contain rotating parts. The centrifugal pump used here pumps mainly clean liquid, so rapid wear of the impellers by abrasive media is avoided.

The device for separating solid and pure phases according to the invention is simple to manufacture, can be made of both metal and polymer pipes. Of the latter, pipes made of low-pressure polyethylene are most appropriate, since they do not wear out for a long time (do not wear out).

The separation device, which is a complex of spiral turns, is, if necessary, quickly replaced.

In this unit, it is possible to transport suspensions with a polydisperse solid phase and with significant particle sizes.

Claims (1)

A slurry hydrotransportation unit comprising a slurry feed device, a centrifugal pump, a water-jet elevator, a device for separating suspensions into solid and liquid phases, characterized in that the device for separating suspensions into solid and liquid phases is a series of spiral tubes connected in series, made of pipes, having an inlet and outlet nozzles, and the outlet nozzle is a replaceable head-separator with two taps and tongue, one tap of the replaceable head-section the nozzle is connected to the suction unit of the centrifugal pump, and the second to the central passive nozzle of the water-jet pump, and the discharge unit of the centrifugal pump is connected to its active nozzle, and the water inlet pipe is tangentially connected to the spiral coil.

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