JPH034363Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a horizontal centrifugal concentrator that rotates sludge at high speed to forcibly separate solid and liquid by centrifugal force.

“Conventional technology” Horizontal centrifugal concentrators commonly used in the past are
As shown in FIG. 2, the tip of a cylindrical outer tube 1 that is rotated at high speed is formed into a conical shape, and is housed within the outer tube 1 and rotated with a relative speed difference with the outer tube 1.
Screw conveyor 2 with a conical tip
An annular space 3 serving as a centrifugal force field is provided between the outer cylinder 1 and the outer cylinder 1 . The sludge 4 is discharged from the rear end of the screw conveyor 2 through the center of the screw conveyor 2 into the center of the annular space 3, and is separated into solid and liquid by centrifugal force. The concentrated sludge 5 that has been separated and stuck to the inner peripheral surface of the outer cylinder 1 is moved through the conical annular space 3 at the tip by the screw 6 of the screw conveyor 2, which rotates with a slight relative speed difference with the outer cylinder 1. The concentrated sludge is scraped up in the same direction and continuously discharged from the concentrated sludge discharge port 7 provided at the tip of the outer cylinder 1. On the other hand, separation liquid 8
The liquid overflows from the separated liquid outlet 10 provided in the annular wall 9 at the rear end of the outer cylinder 1. However, in the above-mentioned conventional horizontal centrifugal thickener, the sludge 4 is discharged into the center of the annular space 3, so not only does the sludge 4 stay in the centrifugal force field for a short time, but also the tip of the outer cylinder 1 Since it is formed in a conical shape, the volume of the centrifugal force field is small and the concentration efficiency is poor. In addition, the sludge 4 discharged into the center of the annular space 3 is separated into the thickened sludge 5 and the separated liquid 8 and moves in opposite directions within the annular space 3, causing turbulence within the annular space 3. There is a drawback that stable solid-liquid separation cannot be performed, and furthermore, the concentration of the discharged concentrated sludge 5 can be controlled by adjusting the supply amount of the sludge 5 discharged into the center of the annular space 3 or Since the control is performed by adjusting the rotational speed of the screw conveyor 1 and the screw conveyor 2, it requires skill and has many drawbacks, such as being extremely troublesome to control.

``Problems to be solved by the invention'' This invention was proposed in view of the above-mentioned drawbacks of the conventional technology.It has good concentration efficiency, enables stable solid-liquid separation, and can accurately and easily measure the concentration of thickened sludge. The present invention aims to provide a horizontal centrifugal concentrator that can be controlled.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention consists of a cylindrical outer cylinder that rotates at high speed, and a cylindrical outer cylinder that is housed in the outer cylinder and rotates at a relative speed difference with the outer cylinder. A sludge supply pipe connected to the opposite end of the annular space formed between the outer cylinder and the screw conveyor, and a thickened sludge connected to the end of the annular space on the transfer side. A discharge pipe, a separated liquid discharge pipe, a concentration detection means for detecting the concentration of sludge supplied by the sludge supply pipe, and a flow rate of the thickened sludge discharged from the thickened sludge discharge pipe according to the detected concentration of sludge. A horizontal centrifugal concentrator is constructed from a control valve and a control valve.

"Function" Since the horizontal centrifugal thickener of the present invention is configured as described above, the sludge supplied into the annular space from the end on the opposite side to the transfer via the sludge supply pipe is separated into solid and liquid by centrifugal force. The thickened sludge stuck to the inner surface of the outer cylinder is scraped up in the annular space in the transfer direction by the screw of the screw conveyor, and is discharged from the thickened sludge discharge pipe. On the other hand, the separated liquid is transferred inside the thickened sludge in the same direction within the annular space by the screw of the screw conveyor, and is discharged from the separated liquid discharge pipe. and,
At this time, the concentration of sludge supplied by the sludge supply pipe is detected by the concentration detection means, and the control valve is optimally controlled according to the detected concentration.
The concentration of the thickened sludge discharged from the thickened sludge discharge pipe is always kept constant even if the properties of the sludge to be treated change.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 11 denotes a cylindrical outer cylinder, and a hollow shaft 12 provided at the center of both end plates is supported by a bearing 13, and is connected via a pulley 14 attached to one end of the hollow shaft 12. The bearing 13 is designed to be rotated at high speed by a drive device that does not
is supported on the foundation surface via a base frame 15 and vibration isolating rubber 16. 17 has screw 1 on the outer periphery
8, its rotating shaft 19
is formed into a hollow shape and is inserted into the hollow shaft 12 of the outer cylinder 11, and is driven by a drive device (not shown) via a pulley 20 attached to one end of the rotating shaft 19 to generate a slight relative speed difference with the outer cylinder 11. A sludge supply pipe 21 is connected to an opening on one end side of a hollow rotating shaft 19 of the screw conveyor 17 via a rotary joint 22. It communicates with the opposite end of an annular space 24 formed between the outer cylinder 11 and the screw conveyor 17 via a radial supply groove 23 provided at one end. 25 is a separated liquid discharge pipe connected to the transfer side end of the annular space 24;
It is inserted into the hollow shaft 12 of the outer cylinder 11, and one end thereof is opened into the annular space 24 via a radial discharge groove 26 provided at one end of the screw conveyor 17.
The other end is connected to the separated liquid discharge chamber 27. 28
is a concentrated sludge discharge pipe connected to the transfer side end of the annular space 24, which is inserted concentrically into the separated liquid discharge pipe 25, and one end thereof is closed. Further, a discharge pipe 29 is provided which penetrates the separated liquid discharge pipe 25 and is connected to the closed part of the concentrated sludge discharge pipe 28, and its tip is located near the inner wall surface of the outer cylinder 11 at the transfer side end of the annular space 24. It is opened. The other end of the thickened sludge discharge pipe 28 is connected to the thickened sludge discharge chamber 30. Reference numeral 31 denotes a concentration detection means provided in the service tank 32 that stores the sludge 33 supplied through the sludge supply pipe 21, and detects the viscosity of the sludge 33 stored in the service tank 32 using a built-in viscosity meter. The concentration of the sludge 33 is detected mechanically, and the concentration of the sludge 33, which is correlated with the viscosity, is indirectly detected from the detected value. space 24
solid-liquid separation within In addition, in the figure, 34 is the separated thickened sludge, and 35 is the separated liquid. Further, 36 is a control valve that adjusts the flow rate of the thickened sludge 34 discharged from the thickened sludge discharge pipe 28 to the thickened sludge discharge chamber 30 according to the concentration of the sludge 33 detected by the concentration detection means 31. The opening degree of the control valve 36 is optimally controlled by an electrical signal 37 transmitted from a sensor built into the detection means 31. In addition, 38 has outer cylinder 1 for safety reasons and to prevent power loss due to air resistance.
A cover 39 that surrounds and seals the service tank 32 is a pump provided in the middle of the sludge supply pipe 21 to transfer the sludge 33 in the service tank 32.

In the horizontal centrifugal thickener of the present invention having the above configuration, the sludge 33 supplied from the sludge supply pipe 21 is
is the hollow rotating shaft 1 of the screw conveyor 17.
9. The liquid is supplied to the opposite end of the annular space 24 through the supply groove 23 and separated into solid and liquid by centrifugal force. The separated thickened sludge 34 sticks to the inner surface of the outer cylinder 11 that rotates at high speed, but the screw conveyor 1 that rotates at a slight relative speed to the outer cylinder 11
The inside of the outer cylinder 11 is scraped together in the transfer direction by the screw 18 of No. 7. On the other hand, the separated liquid 35 is transferred inside the thickened sludge 34 to the annular space 24 by the screw 18 of the screw conveyor 17.
The thickened sludge 34 and the thickened sludge are transferred in the same direction. The thickened sludge 34 scraped up to the transfer side end of the annular space 24 is transferred to the discharge pipe 29 and the thickened sludge discharge pipe 2.
8, the concentrated sludge discharge chamber 30, etc., and the separated liquid 35 is sequentially discharged through the discharge groove 26 and the separated liquid discharge pipe 2.
5. The separated liquid is discharged through the separated liquid discharge chamber 27 and the like. The concentration of the sludge 33 supplied by the sludge supply pipe 21 is detected continuously or intermittently by a concentration detection means 31 provided in the service tank 32, and an electric signal 37 corresponding to the concentration of the sludge 33 is detected.
will be communicated to the control bubble 36. The control bubble 36 is equipped with a control circuit that opens and closes when the concentration of sludge 33 is higher than a set value, and conversely opens and closes when it is lower than the set value, so the amount of sludge 33 to be treated and Even if the properties etc. change, the concentration of the thickened sludge 34 will always be maintained within the permissible range of ± the set value.

In this embodiment, in order to detect the concentration of the sludge 33 supplied by the sludge supply pipe 21, a concentration detection means 31 having a built-in viscometer is provided in the service tank 32, and a correlation with the concentration of the sludge 33 is established. A certain viscosity is detected, and the concentration of the sludge 33 is indirectly detected from that viscosity. A concentration detection means 31 equipped with a sensor capable of detecting the concentration may be provided to directly detect the concentration of the sludge 33.

Further, in this embodiment, only the opening and closing of the control bubble 36 is controlled according to the concentration detected by the concentration detection means 31.
The number of revolutions and the like of 7 may also be controlled in parallel at the same time, or it may be possible to arbitrarily switch between automatic and manual modes. Further, the present invention is not limited to the structure of the illustrated embodiment, and the structure of each part can be arbitrarily modified as necessary.

"Effect of the invention" As explained above, in the horizontal centrifugal thickener of the invention, sludge is supplied to the opposite end of the annular space and transferred to the opposite end of the transfer side, so that the sludge is Not only does the residence time in the centrifugal force field become longer, but since the outer cylinder is formed in a cylindrical shape without a conical part, the centrifugal force field volume can be increased, and the concentration efficiency is further improved. Also,
Since the separated thickened sludge and separated liquid are transported in the same direction and at the same speed within the annular space, no turbulence occurs within the annular space, and stable solid-liquid separation can be performed. Since the concentration of the thickened sludge is controlled by a control valve that is adjusted according to the concentration of the sludge to be treated detected by the concentration detection means, the concentration of the thickened sludge can be controlled accurately and easily. I can do it. The present invention provides a horizontal centrifugal thickener that is extremely effective in practice for treating sludge.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a horizontal centrifugal concentrator showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional horizontal centrifugal concentrator. 11...Outer cylinder, 17...Screw conveyor, 2
1... Sludge supply pipe, 24... Annular space, 25...
Separated liquid discharge pipe, 28...Thickened sludge discharge pipe, 31...
... Concentration detection means, 33 ... Sludge, 34 ... Thickened sludge, 35 ... Separated liquid, 36 ... Control valve.

Claims (1)

[Scope of utility model registration request] A cylindrical outer cylinder that is rotated at high speed, a screw conveyor housed in the outer cylinder and rotated with a relative speed difference with the outer cylinder, and an annular space formed between the outer cylinder and the screw conveyor. Detecting the concentration of sludge supplied by the sludge supply pipe connected to the opposite end of the annular space, the concentrated sludge discharge pipe and the separated liquid discharge pipe connected to the transport end of the annular space, and the sludge supply pipe. A horizontal centrifugal thickener characterized by having a concentration detection means and a control valve that adjusts the flow rate of thickened sludge discharged from a thickened sludge discharge pipe according to the detected concentration of thickened sludge.