RU2504613C2 - Slurry removal device and method - Google Patents

Abstract

FIELD: metallurgy.SUBSTANCE: device includes a manifold pipe having many holes made in its wall at a certain distance from each other, a suction pump, a suction pipe, one end of which is connected to the suction pump and an assembly of a suction head. The suction head assembly is connected to the other end of the suction pipe and is capable of moving in a sliding manner along the manifold pipe from one of its ends to the other. The suction head assembly includes a head section of the housing, which is spatially remote and connected to a rear section of the housing, which has a through axial hole interconnected with the suction pipe. Head and rear sections of the housing fill a considerable part of the manifold pipe during operation and form a suction zone between themselves of such length that at least one hole can be open at location of the suction head assembly at certain positions along the manifold pipe. The method is implemented by means of a device for removal of slurry and consists in installation at the bottom of a sediment tank or a pond of a manifold pipe, connection of the suction pump to one end of the suction pipe, connection of the suction head assembly to the other end of the suction pipe by means of a through axial hole in the rear section of the housing. After that, the suction head assembly is introduced into an open end of the manifold pipe. Besides, front and rear sections of the housing considerably fill the manifold pipe and form a suction zone between them of such length that at least one hole can be open in any position along the manifold pipe. The suction head assembly is moved through the through holes of the manifold pipe at subsequent passage of the working suction pump above holes in the manifold pipe wall.EFFECT: improving slurry removal efficiency.21 cl, 6 dwg

Description

FIELD OF THE INVENTION

This invention relates to a device and method for removing sludge generated in sewage sludge ponds in the manufacture of palm oil, and the disclosure of the essence and scope of this invention is made on the option of its use for this purpose. The present invention can be used for other purposes, for example, to remove sludge from settling ponds.

State of the art

Typically, the extraction of palm oil from oil palm kernels produces wastewater consisting of water and fibrous organic materials and organic materials of a different consistency, dirt and other mineral inclusions, as well as filtering sediments. Wastewater is piped to lined or non-lined open sludge ponds, in which the wastewater undergoes environmental degradation to produce CO ₂ and other gases typically generated during fermentation, as well as sludge. Periodically, the sludge must be removed. Recently, indoor sedimentation tanks have been used as part of a carbon sequestration program. The sumps were covered with a membrane that was adjacent to the liquid medium in the sump. After covering the membrane, it was difficult to remove the sludge.

One way to remove sludge from indoor sumps is to install a stationary system of perforated collector pipes on the bottom of the sump. This pipe system is periodically used to remove sludge. This stationary pipe system has the disadvantage that the suction efficiency decreases as the distance in the sump increases, since the liquid containing less sludge is sucked in through the holes closer to the suction pump, which prevents the suction of the liquid through the holes located further from the suction pump. Sludge can create a funnel around the opening with slopes at a significant angle, which allows fluid to flow out, carrying a limited amount of sludge.

To eliminate this drawback, they try to use a pipe-in-pipe device when the suction device contains an external perforated pipe located at the bottom of the sump and a suction pipe that is gradually introduced into the perforated pipe. The suction pipe extends and retracts into the rotating drum, which is located at the end of the suction pipe and is connected to the rotating coupling of the suction pump. The head or suction nozzle of the suction pipe creates a vacuum only inside the outer perforated pipe in front of the head or suction nozzle. During operation, the suction pipe is fed through a perforated pipe (accompanying its supply by suction so that it is possible to create an opening in the perforated pipe and to promote its advancement). After that, the suction pipe is retracted when suctioning, and the piston effect of the head or suction nozzle means that the suction is carried out only in the area of the perforated pipe in front of the head or suction nozzle.

This device has the disadvantage that at any point on the outer perforated pipe, the nozzle tends to create a vacuum in the entire section of the perforated pipe in front of the nozzle. The suction efficiency decreases with increasing distance from the nozzle, but although with increasing distance the suction becomes ineffective, nevertheless, a suction zone is formed near the powerful nozzle.

Disclosure of invention

The present invention, on the one hand, is a sludge removal device comprising:

a manifold pipe having a plurality of holes in its wall at a certain distance from each other;

suction pump;

a suction pipe, one end of which is connected to a suction pump;

a suction head assembly connected to the other end of the suction pipe and capable of sliding along the collector pipe from one end to the other, the suction head assembly comprising a head portion of the housing spatially remote and connected to a rear portion of the housing having a through axial hole communicating with a suction pipe, and the head and rear sections of the housing during operation fill a significant part of the collector pipe and form between them a suction zone of such a length that It stavan open at least one aperture at the location of the suction head assembly at particular positions along the manifold tube.

The collection pipe can be made of metal, polymer or composite material. Such a manifold pipe should be selected so that it retains its shape under the influence of the expected pressure drop. Accordingly, a pipe made of an elastomeric composite material, such as fabric-reinforced rubber, is predominantly reinforced with wire reinforcement to prevent rupture of the pipe. Since chemically aggressive media are created in some sedimentation tanks, a chemically resistant coating, such as thermally bonded polyethylene or an epoxy coating, is preferably applied to the metal manifold pipe. Advantageously, the collector pipe is formed from a structural thermoplastic, such as high density polyethylene.

The holes may be single holes located one after another along the pipe. The holes can also be arranged in groups formed around the pipe and separated from one group by another along the pipe. The holes may be of any suitable shape. For example, grouped holes can be elongated along the axis of the pipe to provide a certain cross-sectional area in the area of this group of holes.

The collector pipe can be installed in the sludge collector or sump permanently or temporarily, or it can be provided for its movement inside the sump.

The distance between the holes may be the same or different. For example, the distance between them can be selected so that a single hole or group of holes is open in the suction zone at a certain position of the suction head assembly in the manifold pipe. Otherwise, the collector pipe may pass through areas with more or less strong sedimentation of solids, and it may be useful to provide multiple holes or groups of holes in the suction zone at the same time.

The suction pump can take any form suitable for working with sludge or for removing settled particles. The suction pump can be selected from direct displacement reciprocating pumps such as peristaltic pumps or vane pumps. In addition, the suction pump can be a vacuum-discharge pump of cyclic action with a Venturi profile, operating on compressed air. The pump can be installed permanently or temporarily, or a mobile pump can be used. The pump can operate from an autonomous power source or from the mains. A pump with an autonomous power source may be driven by an internal combustion engine using a direct gear or an indirect gear. The indirect gear may be a hydraulic or pneumatic drive. If a cyclic vacuum pump is used with a Venturi profile operating on compressed air, this pump may be equipped with a mobile compressor unit or may be equipped with a compressor.

The suction pipe may have any suitable shape. The suction pipe can be molded from a polymer or polymer based composite material. A suction pipe should be chosen so that it retains its shape under the influence of the expected pressure drop. Accordingly, a pipe made of an elastomeric composite material, such as fabric-reinforced rubber, is predominantly reinforced with wire reinforcement to prevent it from breaking. Advantageously, the suction pipe is formed from a structural thermoplastic, such as high density polyethylene (HDPE).

You can connect the suction pipe to the suction pump using a direct fixed connection. However, in order to be able to wind and rewind the suction pipe from the winding device, the suction pipe is advantageously connected to a rotary coupling of the suction pump provided with the winding device. Mostly the suction pump is equipped with a winding device, forming a transportable unit.

The suction head assembly may be located near the nozzle of the through hole of the manifold pipe to adhere to surfaces with a low coefficient of friction and / or be wetted by water and thereby facilitate its movement. However, this can be dispensed with, and then the suction head assembly can enter the working clearance of the through hole, substantially filling the through hole of the pipe separating the suction zone from the manifold pipe in front and behind the suction head assembly. The assembly of the suction head can be made in the form of a blind coupling or a rotating coupling.

The head and rear sections of the housing can be made of the same material or of different materials and can have a metal or plastic construction. For example, the respective sections can be molded from casting resin or molded from thermoplastic material, or molded from an easily processable polymer such as DELRIN® delrin. The head portion of the housing can be separated from the rear portion of the housing by any suitable device capable of creating an open suction zone between them. For example, the head and rear sections of the housing can be molded as a unit with connecting jumpers between them. Otherwise, the head and rear portions of the housing may be the head and rear elements connected by one or more intermediate spacers. In the case of manufacturing the head and back sections from a suitable material, the spacers can be a group of several metal rods having threads at the ends or otherwise attached to the corresponding elements of the housing.

Intermediate spacers can be made in the form of a hollow tubular element connected to the suction pipe through the rear portion of the housing and having holes in the wall through which vacuum can be created in the suction zone. Otherwise, the rear portion or element may have a through axial hole or a through channel of a different kind, through which the suction pipe directly communicates with the suction zone.

The suction zone formed between the head and rear portions of the housing is so long that at least one opening of the collector pipe opens in any position along the collector pipe, as described above. At certain points along the manifold pipe there may be places or conditions may be created under which the vacuum created by the suction pump must be slightly reduced to prevent the pump from stopping. In addition, in order to allow the suction head assembly to advance along the manifold pipe, it may be necessary to reduce movement resistance in front of the suction head assembly. At this end, an equalization channel can be created that passes through the head portion of the housing and communicates with the suction zone in the manifold pipe in front of the suction head assembly. For example, an axial equalization channel can be created between the suction zone and the manifold pipe in front of the suction head assembly.

On the other hand, this invention is a method for removing sludge, in which:

install on the bottom of the sump or pond, a collector pipe having many holes in the wall located at certain distances from each other;

connecting the suction pump to one end of the suction pipe;

connect the node of the suction head, containing the head portion of the housing located at a distance from the rear portion of the housing and bonded to the rear portion of the housing, to the other end of the suction pipe using a through axial hole in the rear portion of the housing;

introducing a suction head assembly into the open end of the manifold pipe, the head and rear portions of the housing substantially filling the manifold pipe and forming a suction zone therebetween so long that at least one opening is opened in any position along the manifold pipe; and

move the node of the suction head through the through hole of the collector pipe while sequentially passing the working suction pump over the holes in the wall of the collector pipe.

Brief Description of the Drawings

The accompanying figures depict a preferred embodiment of the present invention.

Figure 1 shows a side view of the node of the suction head used in the device according to this invention.

Figure 2 shows the device according to this invention.

Figure 3 shows a top view of the device according to this invention.

Figure 4 shows a side view of the device according to this invention.

Figure 5 shows the end view of the device according to this invention with the retracted carriage.

Figure 6 shows an end view of a device according to this invention with an extended carriage.

The implementation of the invention

The figures show a pipe-in-pipe sludge cleaning device 10 designed to periodically remove sludge from a sump 11 having a cover 12. The sludge cleaning device 10 comprises a stationary or installed manifold pipe 13 having openings 14 with a diameter of 50 mm located at the same distance from each other for 1000 mm along it, and a suction pipe 15 of HDPE, capable of entering the installed collector pipe 13. The suction pipe 15 has at its end a suction assembly 16 containing a head unit 17 having the th axial equalization channel 20, located at a distance from the rear unit 21 and attached to it by stainless steel rods 18. The rear unit 21 has a through axial hole 19, which provides communication with the suction pipe 15, and the blocks 17 and 21 form between each other a suction zone 22 with a length of 940 mm.

When the head unit 17 passes by the holes 14 in the collector pipe 13 above the adjacent area at the bottom of the indoor sludge collector 11, the suction zone 22 focuses its action in turn on each hole. The suction zone with a length of 940 mm maximizes the length of stay of the zone above the hole during the translational movement of the suction unit.

The collector pipe 13 has a nominal diameter of 90 mm, and the holes are located only on the underside of the pipe. The suction pipe 15 has an outer diameter of 75 mm. The diameter of the head and rear blocks is chosen so as to provide gaps of 1.5 mm in the through hole of the collector pipe 13.

The vacuum-injection pump 23 operating on compressed air is connected to the center of the winding device 24 of the suction pipe using a fitting with a union nut 25. The pump 23 exposes the suction unit 15 to vacuum, creating a vacuum in the suction zone. The axial equalization channel 20, which has a diameter of 13 mm, is partially evacuated so that the collector pipe 13 can be cleaned with the suction unit 15 moving forward. The speed of movement is about 1 m / min or 3-4 cycles using a typical vacuum pump 23, working on compressed air and creating a vacuum of 635 mm RT. Art. and productivity of 100 l for each cycle.

The decrease in evacuation due to the axial channel in the head unit having a diameter of 13 mm is insignificant in comparison with the decrease due to suction through one hole having a diameter of 50 mm. Almost all evacuation serves to ensure suction through openings having a diameter of 50 mm during the passage, and the combination of evacuation and discharge at a typical pressure of the sump itself, characterized by the hydraulic pressure near the collector pipe, which is 6 m water. Art., provides excellent suction results.

The pump 23 is usually mounted on a wheeled chassis 26, on which the suction pipe winding device 24 is also placed. The winding device 24 is intended for winding and winding the suction pipe 15. The wheels 27 of the chassis 26 are able to rise and fall to ensure stability during operation. A compressor 30 with a diesel drive provides transmission stages for the pump 23. Fire extinguishers 31 are also installed here. The front wheels 33 are controllable.

It is understood that this embodiment serves, of course, for a more detailed presentation of the essence of the present invention. For those skilled in the art, all those changes and modifications that can be made without going beyond the essence and scope of the invention, which are defined in the following formula, are obvious.

Claims (21)

1. A device for removing sludge, comprising: a collector pipe having many holes in its wall at a certain distance from each other; suction pump; a suction pipe, one end of which is connected to a suction pump; a suction head assembly connected to the other end of the suction pipe and capable of sliding along the collector pipe from one end to the other, the suction head assembly comprising a head portion of the housing spatially remote and connected to a rear portion of the housing having a through axial hole communicating with a suction pipe, and the head and rear sections of the housing during operation fill a significant part of the collector pipe and form between them a suction zone of such a length that It stavan open at least one aperture at the location of the suction head assembly at particular positions along the manifold tube. 2. The device according to claim 1, characterized in that the collector pipe is made of a polymer material or a composite material based on it. 3. The device according to claim 2, characterized in that the polymer is a high density polyethylene. 4. The device according to claim 1, characterized in that the holes are made in the form of single holes located one after the other along the pipe, or holes located in groups around the pipe, and these groups are located at a distance from each other along the pipe. 5. The device according to claim 4, characterized in that the holes are arranged in groups and the holes have an elongated shape in the direction of the axis of the pipe, so that you can save a given area of the holes in the cross section. 6. The device according to claim 1, characterized in that the collector pipe is installed in the sludge collector or sump stationary. 7. The device according to claim 1, characterized in that the collector pipe in the sludge collector or sump is made with the possibility of movement. 8. The device according to claim 1, characterized in that the holes are located at the same distance from each other. 9. The device according to claim 1, characterized in that the suction pump is made in the form of a direct displacement piston pump. 10. The device according to claim 1, characterized in that the suction pump is made in the form of a vacuum-discharge pump of cyclic action with a Venturi profile operating on compressed air. 11. The device according to claim 1, characterized in that the suction pump is made by a mobile or transported pump. 12. The device according to claim 1, characterized in that the suction pipe is made by molding from a polymer or composite material based on this polymer. 13. The device according to claim 1, characterized in that the connection of the suction pipe to the suction pump is made in the form of a rotating coupling of the suction pump, equipped with a winding device, and the suction pipe can be wound and wound from a winding device. 14. The device according to item 13, wherein the suction pump is equipped with a winding device, forming a transportable unit. 15. The device according to claim 1, characterized in that the node of the suction head enters the lumen of the through hole, providing a significant filling of the through hole of the pipe and separating the suction zone from the manifold pipe in front and behind the node of the suction head. 16. The device according to claim 1, characterized in that the head and rear portions of the housing have a plastic structure selected from the group consisting of casting resin, thermoplastic casting, and easily processed polymer. 17. The device according to claim 1, characterized in that the head portion of the housing is spatially separated from the rear portion of the housing, and they are molded as a unit with connecting jumpers between them. 18. The device according to claim 1, characterized in that the head portion of the housing and the rear portion of the housing are made in the form of corresponding head and rear elements, remote from each other and connected by one or more intermediate spacers. 19. The device according to claim 1, characterized in that it contains an equalization channel passing through the head portion of the housing and connecting the suction zone to the collector pipe in front of the suction head assembly. 20. The device according to claim 19, characterized in that the channel is made in the form of an axial equalization channel between the suction zone and the collector pipe in front of the suction head assembly. 21. A method for removing sludge, in which: a collector pipe is installed at the bottom of a sump or pond, having a plurality of holes in the wall located at certain distances from each other; connecting the suction pump to one end of the suction pipe; connect the node of the suction head, containing the head portion of the housing located at a distance from the rear portion of the housing and bonded to the rear portion of the housing, to the other end of the suction pipe using a through axial hole in the rear portion of the housing; introducing a suction head assembly into the open end of the manifold pipe, the head and rear portions of the housing substantially filling the manifold pipe and forming a suction zone therebetween so long that at least one opening is opened in any position along the manifold pipe; and moving the assembly of the suction head through the through hole of the collector pipe while sequentially passing the working suction pump over the holes in the wall of the collector pipe.

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