JPS637809A - Separator for coarse particle contained in slurry - Google Patents

Abstract

PURPOSE:To easily and surely perform the regulation of the amount of slurry contained in drain and to enhance the washing efficiency of a screen by utilizing a slurry pump for drain which is provided in the discharge line of drain and is variable in the number of revolutions. CONSTITUTION:At a time for ordinary operation, slurry introduced into a strainer 6 through a slurry pipe 5 is regulated so that one part thereof is discharged by only specified amount as slurry of drain contg. coarse particles by a slurry pump 13 for drain through a slurry pipe 8 for drain. Then in case of stopping a pressurizing pump 3 while operating the above-mentioned pump 13, the inlet side of the pump 13 is made to negative-pressure and therefore the flow of slurry passing through a screen 7 is contrarotated. At this time, the slurry flowing in the reverse rotating direction is replenished through a slurry pipe 10 and introduced into the strainer 6 via a branched pipe 19 provided to cushion tank 16 and the flow of slurry shown in an arrow 12 is caused and slurry is passed through the screen 7 in the direction shown in the arrows 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for separating coarse particles in slurry, and particularly to a device for separating coarse particles in slurry.
When separating coarse particles from water slurry, a device for separating coarse particles in slurry is suitable for preventing clogging in the strainer and equipment wear on the drain discharge line side of the strainer, and increasing the cleaning efficiency of the screen in the strainer. Regarding.

[Conventional technology]

Slurry fuel can be treated as a fluid by mixing solid particles with a fluid, so
It has great advantages in terms of handling and control, and is therefore attracting attention as a new application technology to replace coal valve handling.

FIG. 3 is a schematic configuration diagram showing an example of a conventional apparatus for separating coarse particles in slurry. In FIG. 3, slurry mixed with coarse particles is stored in a sump tank 1, is pressurized by a pressure pump 3, and reaches a strainer 6. Strainer 6
Coarse particles in the slurry are separated by a screen 7 and discharged from below the strainer 6 through a drain slurry pipe 8. At this time, the amount of drain slurry is adjusted by the adjustment valve 9. The slurry that has passed through the screen 7 is stored in a product tank 11 via a slurry pipe 10.

[Problem that the invention seeks to solve]

In the apparatus for separating coarse particles in slurry as described above, when the regulating valve 9 is throttled to adjust the amount of drain slurry, the valve port of the regulating valve 9 is clogged with coarse particles in the drain slurry, and the flow rate of the regulating valve 9 is 1 m. In addition, the flow of drain slurry in the regulating valve 9 causes severe wear on the valve port portion of the regulating valve 9. Further, in order to eliminate clogging of the screen 7, the slurry is temporarily flowed in the opposite direction to the screen 7.
The so-called backwash operation cannot be performed because the regulating valve 9 itself is clogged.

The purpose of the present invention is to solve the problems of the prior art described above,
To provide a device for separating coarse particles in slurry, which stably discharges drain slurry from a strainer, facilitates adjustment of the amount of drain slurry, and enables backwashing of a screen.

[Means for solving problems]

The above purpose is to install a drain slurry pump with a variable rotation speed in the drain discharge line, and when the drain slurry pump inlet side becomes negative pressure in the slurry distribution line on the screen passing side due to the operation of the drain slurry pump, the screen This is achieved by providing a slurry tank capable of supplying slurry from the slurry passing side in a direction opposite to the slurry passing direction.

[Effect]

When the pressure pump for flowing slurry containing coarse particles into the strainer is stopped, and the variable rotation speed drain slurry pump installed on the drain discharge side is activated, the drain slurry pump inlet side becomes negative pressure, and the slurry Compared to a drain slurry flow rate adjustment valve, a drain slurry pump with a variable rotation speed of 0 that performs backwashing by flowing slurry in the opposite direction from the tank to the screen is significantly less prone to clogging and wear due to coarse particles in the slurry. reduce

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of an apparatus for separating coarse particles in slurry according to the present invention. In FIG. 1, the same or equivalent components as the conventional example shown in FIG. Indicated by the same reference numerals as in the figure.

In FIG. 1, a drain slurry pump 13 is installed in a drain slurry pipe 8 connected to the bottom side of the strainer 6.
Power from a motor 14 is transmitted to this drain slurry pump 13 via a transmission 13.

A slurry branch pipe 19 branched from the slurry pipe 10 through which the slurry passed through the screen 7 in the strainer 6 flows is connected to the Kutsushiran tank 16. A diaphragm 17 that is expandable and deformable by fluid pressure is installed inside the Kutsushiran tank 16, and the inside of the tank is divided into two chambers in the height direction, with the lower chamber communicating with the branch pipe 19. ing. The upper chamber within the tank is sealed.

In the apparatus for separating coarse particles in slurry configured as described above, the slurry stored in the sump tank 1 is pressurized by the pressure pump 3 operated by the motor 4 and transferred to the strainer 6.
leading to. Coarse particles in the slurry are separated by a screen 7 provided within the strainer 6. The slurry separated by the screen 7 is transferred to a drain slurry pump 13 with variable rotation speed, to which the power of a motor 15 is transmitted via a transmission 14.
is discharged and returned to the sump tank l. - On the other hand, the slurry that has passed through the screen 7 is sent to a product tank 11 through a slurry pipe 10.

Thus, during normal operation, slurry flows in the directions shown by arrows 2.12 and 1B in FIG. That is, the slurry pipe 5
The slurry that has flowed into the strainer 6 is treated as drain slurry whose negative part contains coarse particles and is pumped from the drain slurry pipe 8 to the drain slurry pump 13 in a specified amount (for boat fishing, approximately 10 to 30% of the amount flowing into the strainer 6). Adjustments are made so that only the

Specifically, positive pressure is applied to the artificial side (strainer 6 side) of the drain slurry pump 13 by the pressure pump 3.
Therefore, it acts to accelerate the rotation speed of the drain slurry pump 13, but the drain slurry pump is connected to the motor 15 via the transmission 14, and the drain slurry pump 13
is operated while maintaining a specified rotation speed, so even if the pressure on the inlet side of the drain slurry pump 13 fluctuates, only the specified amount of drain slurry will pass through.If you want to increase or decrease the amount of drain slurry, change the gear racing of the transmission 14. This makes it possible to set an arbitrary amount of drain slurry.

Next, FIG. 2 shows the flow direction of the slurry when the pressure pump 3 is stopped while the drain slurry pump 13 is operated.
Since the suction action of the drain slurry pump 13 is continued when the slurry flow is stopped, the drain slurry pump 1
There is a negative pressure on the inlet side of 3, so that the flow of slurry through screen 7 is reversed as shown in FIG.

At this time, the slurry flowing in the reverse direction is the slurry pipe 1
The slurry in the cushion tank 16 flows into the strainer 6 through the branch pipe 19, and the slurry flow as indicated by the arrow 12 in FIG. Pass through 7 in a slurry manner. This state indicates that the screen 7 will be backwashed.

The cleaning effect of the screen 7 due to this backwashing operation is extremely large, and an operation time of several tens of seconds to several minutes is sufficient, and therefore it has been demonstrated through experiments that a small volume of the cushion tank 16 is sufficient. are doing.

Note that the cushion tank 16 has a secondary effect of alleviating the pressure disturbance phenomenon when the pressurizing pump 3 and the drain slurry pump 13 are activated simultaneously, so that stable operation of the apparatus can be achieved.

In the present invention, instead of the cushion tank 16, there is provided a slurry tank installed at a higher position than the strainer 6 and connected to the slurry pipe 19 in FIG. When the pressure becomes negative, slurry may be supplied from the slurry tank to the strainer for backwashing.

〔Effect of the invention〕

As described above, according to the present invention, (1) it is possible to easily and reliably adjust the amount of drain slurry from the strainer, and (2) it is possible to avoid the problem of wear in the adjustment part that accompanies adjustment of the amount of drain slurry. (3) If the pressurizing pump for flowing slurry into the strainer is stopped while the drain slurry pump is in operation, a backwash condition appears, so that the cleaning efficiency of the screen can be significantly improved.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of a coarse particle separation device in slurry according to the present invention, Fig. 2 is an explanatory diagram showing the state during backwashing operation in Fig. 1, and Fig. 3 is a conventional 1 is a schematic configuration diagram showing an example of an apparatus for separating coarse particles in a slurry. l... Sump tank, 3... Pressure pump, 6... Strainer, 7... Screen, 8... Drain slurry pipe, 10・・・・・・
・Slurry pipe, 11...Product tank, 13...
...Drain slurry pump, 14...Transmission,
15...Motor, 16...Cushion tank, 17...Diaphragm. Agent Patent Attorney Masaru Nishimoto - Figure 1 Figure 2 Figure 3 Old

Claims (2)

[Claims] (1) A device for separating coarse particles in slurry, which is equipped with a strainer with a screen installed inside, a slurry distribution line through which the slurry that has passed through the screen in the strainer flows, and a drain slurry discharge line that discharges the drain slurry in the strainer. A drain slurry pump with a variable rotation speed is installed in the drain discharge line, and when the inlet side of the drain slurry pump becomes negative pressure due to the operation of the drain slurry pump, slurry is discharged from the slurry passing side of the screen. A device for separating coarse particles in slurry, comprising a slurry tank capable of supplying slurry in a direction opposite to the passing direction. (2) The slurry tank is provided with a diaphragm that can be deformed by fluid pressure, and one chamber partitioned by the diaphragm is a cushion tank that is connected to the slurry distribution line and filled with slurry. An apparatus for separating coarse particles in a slurry according to claim (1), characterized in that the apparatus comprises: