RU214005U1 - Unit for unloading the liquid phase of the decanter centrifuge - Google Patents

Abstract

The utility model relates to a decanter centrifuge for separating feed material into a liquid phase and a solid phase, namely, to an outlet assembly for discharging the liquid phase. The unit for unloading the liquid phase of the decanter centrifuge includes at least four nozzles mounted on traps rigidly fixed on the centrifuge drum in the places of the holes for the exit of the liquid phase, while the nozzles are installed by means of a hinged joint that allows you to change the angle relative to the trap, the part of the nozzle farthest from the hinge is connected by a rod with a drive, presented in the form of a ring gear, made with the possibility of rotation and fixing the position from the transmission moment transmitted by rotation of the handle installed in the hole located at the end of the drum. The technical result is to reduce energy consumption due to the recovery of kinetic energy. 1 z.p. f-ly, 1 ill.

Description

The claimed solution relates to a decanter centrifuge for separating the feed product into a liquid phase and a solid phase, namely, to the liquid phase discharge outlet assembly.

State of the art

Widely known are various types and modifications of decanters used for separating mixtures of liquids or for separating solids and liquids or solids and mixtures of liquids.

The principle of operation of decanter centrifuges is to separate the solid and liquid phases from the supplied initial mixture under the action of centrifugal forces. A decanter centrifuge includes the following structural elements: a body, a screw with a conical part on one side, a drum, a feed unit, a solid phase selection unit, a feed distributor, a liquid phase selection unit, a gearbox.

In the prior art, various devices and methods are known to improve the design of a decanter centrifuge for separation.

For example: a decanter centrifuge is known from US Pat.

From the patent of the Russian Federation No. 2676983, a DECATER CENTRIFUGE is known, containing a rotating drum equipped with at least one opening for discharging the solid phase and at least one opening for discharging the purified liquid, and a screw conveyor coaxially located inside the specified rotating drum and rotating in the same direction with excellent rotation speed. The separation slurry is fed into the annular space formed between said rotating drum and said screw conveyor through a central feed pipe attached to the end of the screw conveyor and supported by at least one support. The slurry can be separated by centrifugal force into a solid phase and a liquid phase so that said solid phase is discharged through said solid phase discharge port and said liquid phase is discharged through said purified liquid discharge device, wherein the liquid phase channel extends inside the shaft, discharging the liquid phase behind the supports, while a valve is provided for unloading the liquid phase behind the support from the side opposite to the drum and screw. The valve for unloading the liquid phase is made with the possibility of its regulation during the operation of the decanter centrifuge by means of a hand wheel through a transmission or by means of a motor.

From the patent for the invention of the Russian Federation No. 2593775, a CENTRIFUGE AND THE UNIT OF THE OUTLET OF THE SPECIFIED CENTRIFUGE, PROVIDING A REDUCTION OF THE CONSUMPTION OF POWER, are known. The rotating machine comprises a drum rotatably mounted around an axis to create a cylindrical bath of loaded pulp, the drum having a heavy phase outlet, a base plate provided at one of the longitudinal ends of the drum, at least one outlet made in the base plate, and liquid phase outlet assembly. The liquid phase outlet assembly is configured to be mounted above the outlet of the rotating machine and comprises a flange and an inlet made in the flange. The liquid phase outlet assembly contains at least one open straight channel with a longitudinal axis. In this case, the longitudinal axis of said channel passes at an acute angle to the flange, and said channel is extended along the longitudinal axis.

The disadvantages of the known solutions is the impossibility of controlling the exit of the liquid jet, which in turn leads to the fact that the liquid phase, leaving the centrifuge drum, takes with it most of the kinetic energy spent on bringing the drum to the operating speed and maintaining this speed.

Centrifugal separation compared to other separation methods is a relatively more energy intensive process and therefore reducing energy consumption is critical to the efficiency of this technology.

Utility Model Disclosure

The technical problem to be solved by the claimed utility model is the creation of a liquid phase extraction unit, made with the possibility of changing the jet outlet angle for a specific product.

The technical result of the claimed utility model is to reduce energy consumption due to the recovery of kinetic energy.

The technical result of the claimed utility model is achieved by the fact that a device is proposed that includes at least four nozzles mounted on traps rigidly fixed on the centrifuge drum in the places of the holes for the exit of the liquid phase, while the nozzles are installed by means of a swivel that allows you to change the angle relative to the trap, far from the hinge part of the nozzle is connected by a rod with a drive represented in the form of a gear rim, made with the possibility of rotation and fixing the position from the transmission moment of the handle transmitted by rotation, installed in the hole located at the end of the drum.

In the preferred embodiment, on the end part of the centrifuge drum, near the hole for installing the handle, there is a scale for determining the angle of rotation of the handle and nozzle.

The combination of the above essential features leads to the fact that

the principle of recuperation is implemented using nozzles on the side of the discharge of the liquid phase, namely, a part of the kinetic energy of rotation of the centrifuge drum is returned;

the jet exit angle can be changed for a specific product and specific operating conditions by trial and error at the customer's site.

Brief description of the drawings

The figure shows a diagram of the device, a view from the end of the centrifuge drum, where the numbers indicate

1. Fluid outlet nozzle (quantity depends on specific model).

2. Rod for adjusting the angle of the nozzle.

3. Drive (ring gear) simultaneous change of nozzle direction angle. The ring gear rotates along the guide rollers relative to the drum and transmits the moment to change the angle of all nozzles simultaneously.

4. Catcher.

5. Guide rollers.

6. Hole for the handle.

7. Hole for the exit of the liquid purified phase (the amount depends on the specific model of the centrifuge and is determined by the manufacturer).

8. Scale in degrees to control the position of the nozzle angle.

Implementation and implementation examples

Below is an example of a specific implementation of the device, which does not limit the options for its execution.

The inventive device according to the figure relates to the liquid phase extraction unit and consists of a housing, which is the walls of the centrifuge drum (not shown in the drawings), the design of which is similar to the known solutions from the prior art, nozzles 1 for exiting the liquid phase of the product, installed on the traps 4 with the possibility rotation in a plane perpendicular to the axis of the drum, the angle of rotation is regulated by the rod 2, fixed on one side on the nozzle 1, the other on the drive 3. The drive 3 is presented in the form of a ring gear and is made with the possibility of rotation by using the transmission moment from the rotation of the removable handle, installed in hole 6 located at the end of the drum so that it is possible to transfer torque from the handle to drive 3. Drive 3 is fixed and rotates by means of guide rollers 5 installed with the possibility of rotation and transmission of torque to drive 3. Rotation of the drive (crown) 3 and, accordingly, the position of the nozzles 1 is changed are manually operated using a detachable handle, and the position of the nozzles is controlled by scale 8, located at the hole 6 for attaching the handle. After adjustment, the handle is removed, and the position of the crown 3 is fixed, for example, with a bolt (not shown in the figure).

The minimum number of guide rollers for the installation is 4 pcs.

The nozzles 1 are mounted on the traps 4 by means of a swivel, which allows the nozzle 1 to change its position relative to the trap 4 in a plane perpendicular to the centrifuge drum. The nozzles 1 are connected to the ring gear 3 with the help of rods 2, which provides a simultaneous change in the angle of the outflow of the liquid phase and, accordingly, the reactive moment created by the jet.

As rods 2 can be used metal rods, pivotally connected to the nozzle on one side and the drive (crown) on the other.

The rods 2 are preferably hinged on the drive 3 by means of a riveted movable non-separable connection of the rods 2 with nozzles 1, carried out by means of a hinged riveted movable non-separable connection, the connection node is located closer to the edge of the exit from the nozzle for the possibility of adjusting the angle of the rod.

Catchers 4 are rigidly mounted on the centrifuge drum with two bolts in the holes 7 for the exit of the liquid phase.

The number of traps 4 with a nozzle 1 with an adjustable liquid phase outflow angle is equal to the number of holes for discharging the liquid phase and depends on the design of a specific model of a decanter centrifuge. The minimum number is 4.

The main indicators during the operation of a decanter centrifuge are the speed of rotation of the drum, the differential speed of the screw for unloading the solid phase and the supply of the product to the separation. In most cases, adjusting the differential speed of the auger is automatic and will not affect the operation of the device in any way. These parameters are always selected individually for a specific technological process and for a specific product, depending on the content of the solid phase. Therefore, it is also necessary to select the angle of the liquid phase outflow from the drum to create the maximum jet thrust during commissioning or when changing the product or the technological process. When selecting the angle of the liquid phase nozzle, it is necessary to create a table of energy consumption of the decanter centrifuge at a constant feed and already set drum speed. By changing the angle, it is necessary to control the change in energy consumption and find the optimal angle.

Implementation example

Installation of elements and preparation for work

At the end of the drum of the decanter centrifuge, on the side of the liquid phase discharge, holes are drilled for mounting traps 4 (the number is equal to the number of holes for discharging the liquid phase) with a nozzle 1, holes for mounting guide rollers (4 pieces) of the ring gear 3, hole 6 for mounting the handle for changing nozzle angle position 1, a blind hole for fixing the ring gear 3. Threads are cut in the holes for mounting the catcher 4 with nozzle 1 and installation is carried out. Next, the ring gear 3 is installed with the help of guide rollers 5 and with the help of rods 2 all nozzles 1 are connected to the ring 3. After mounting the device, it is necessary to balance the decanter centrifuge drum assembly. After checking and balancing, you can start setting up the operation of the decanter centrifuge and then the angle of the outflow of the liquid phase.

The device works as follows

When the centrifuge drum rotates, the liquid enters the traps 4 with nozzles 1, the direction of the nozzles 1 is set by rotating the handle, which transmits torque to the drive 3, sections of which are connected to the nozzles 1, after setting the angle, the drive 3 is fixed by, for example, a bolted connection or clamp.

Thus, the use of the claimed utility model reduces the energy consumption of the decanter centrifuge due to the recovery of kinetic energy during the expiration of the liquid phase and imparting an additional reactive moment. Reducing the energy consumption of the centrifuge is achieved in the range from 5% to 15%.

Claims (2)

1. The site for unloading the liquid phase of the decanter centrifuge, characterized in that it contains at least four nozzles mounted on traps rigidly fixed on the centrifuge drum in the places of the holes for the exit of the liquid phase, while the nozzles are installed by means of a swivel that allows you to change the angle relative to the trap , the farthest part of the nozzle from the hinge is connected by a rod with a drive, presented in the form of a ring gear, made with the possibility of rotation and fixing the position from the transmission moment transmitted by rotation of the handle installed in the hole located in the end of the drum. 2. The unit for unloading the liquid phase of the decanter centrifuge according to claim 1, characterized in that on the end part of the centrifuge drum at the hole for installing the handle there is a scale for determining the angle of rotation of the handle and nozzle.

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