JP2013066857A - Drive control device of swirl flow type solid-liquid separation apparatus and drive control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device optimally controlling driving of a swirl flow type solid-liquid separation apparatus regardless of fluctuation of a flow rate or concentration of a slurry liquid.SOLUTION: The drive control device of a swirl flow type solid-liquid separation apparatus includes: a differential pressure detecting units 13 and 14 for detecting the differential pressure of an inlet pressure and an outlet pressure of the swirl flow type solid-liquid separation apparatus; an outlet automatic valve 12 provided on an outlet pipe of the swirl flow type solid-liquid separation apparatus; and an outlet automatic valve control unit 15 for controlling an opening of the outlet automatic valve so as to keep the differential pressure within a predetermined range.

Description

  The present invention relates to a swirling solid-liquid separator that removes solids from a slurry-like liquid such as cooling water used in continuous casting equipment, and in particular, optimally controls the operation of the swirling solid-liquid separator. The present invention relates to an apparatus and a method.

  The cooling water sprayed by the continuous casting equipment or the like to cool the slab is mixed with solids (coarse particles) such as scales separated from the slab to form a slurry liquid. When spraying such cooling water as it is, Since there is a possibility that the quality of the cast slab may be impaired by the solid matter biting into the casting roller, the solid matter is separated and removed from the slurry liquid when the cooling water is reused.

  As an apparatus for continuously separating and removing solids from such a slurry liquid, for example, a swirl type solid-liquid separation apparatus such as a cyclone type or a Lacos (registered trademark) type has been conventionally known (Patent Literature). 1). FIG. 2 schematically illustrates a configuration of an operation control device of a conventional lacos-type swirling flow solid-liquid separator. Here, for example, a slurry liquid containing coarse particles exiting a cooling facility in a continuous casting facility. SL flows through the slurry liquid inlet pipe 2 having the inlet valve 1 and flows from the upper end of the sealed cylindrical tank 3 inclined to the upper end inner peripheral passage in the tank 3, and a plurality of slits arranged therein 4 enters the separation cylinder 5 in the tank 1 and is accelerated in the tangential direction, and is swirled to descend in the separation cylinder 5.

  At that time, the coarse particles and the liquid of the slurry liquid SL are separated by a difference in centrifugal force and a difference in specific gravity between them. Coarse particles G settle and become concentrated slurry liquid CSL, and intermittently or continuously from the lower end of tank 3 through concentrated slurry liquid discharge pipe 8 having concentrated slurry liquid discharge valve 7 operated by timer 6. On the other hand, the treated liquid L from which the coarse particles G have been separated flows out from the upper end of the tank 3 to the outside through the discharge cylinder 9 at the inner central portion of the separation cylinder 5, and is manually operated at the outlet. It returns to the cooling facility through a treated liquid outlet pipe 11 having a valve 10.

JP-A-2005- 211785

  By the way, when the inventor of the present application analyzed the operation state of the swirl type solid-liquid separator, the slurry liquid from the continuous casting equipment or the like tends to have a relatively large flow rate fluctuation and concentration fluctuation, whereas the slurry liquid SL When the flow rate of the outlet manual valve 10 is small, the outflow of the processed liquid L is hindered and the differential pressure between the inflow pressure of the slurry liquid SL and the outflow pressure of the processed liquid L becomes small. For this reason, there existed a problem that a swirl flow weakened and it became impossible to fully isolate | separate the coarse grain G from the slurry liquid SL. On the other hand, if the opening degree of the outlet manual valve 10 is too large, the differential pressure between the inflow pressure of the slurry liquid SL and the outflow pressure of the processed liquid L becomes large. The accumulated concentrated slurry liquid CSL is wound up, and there is a problem that the wear of the inner wall of the tank 3 due to the coarse particles G becomes severe. And when the density | concentration of the slurry liquid was high, the problem of separation of the coarse grain G mentioned above and abrasion of a tank inner wall became remarkable.

  Further, when the flow rate of the slurry liquid SL is small, if the opening degree of the outlet manual valve 10 is large, the pressure in the lower end portion of the tank 3 due to the fall and outflow of the treated liquid L, and thus the concentrated slurry in the concentrated slurry liquid discharge pipe 8. There is also a problem that it is difficult to discharge the concentrated slurry liquid CSL from the concentrated slurry liquid discharge pipe 8 when the discharge pressure of the liquid CSL becomes negative and the concentration of the concentrated slurry liquid CSL is high.

  Therefore, in order to solve the above-mentioned problems, the present invention takes into account the differential pressure between the inflow pressure of the slurry liquid SL and the outflow pressure of the processed liquid L and the discharge pressure of the concentrated slurry liquid, and the flow rate fluctuation and concentration fluctuation of the slurry liquid. It is an object of the present invention to provide an operation control apparatus and an operation control method for optimally controlling the operation of the swirling flow type solid-liquid separator.

The operation control device of the swirl type solid-liquid separation device of the present invention that achieves the above object is as follows.
Differential pressure detection means for detecting the differential pressure between the inlet pressure and the outlet pressure of the swirling flow solid-liquid separator;
An automatic outlet valve provided in the outlet pipe of the swirling flow solid-liquid separator;
Outlet automatic valve control means for controlling the opening degree of the outlet automatic valve so that the differential pressure falls within a predetermined range;
It is characterized by comprising.

In addition, the operation control method of the swirl type solid-liquid separation device of the present invention that achieves the above object is as follows.
Detect the differential pressure between the inlet pressure and outlet pressure of the swirling flow solid-liquid separator,
The opening degree of the outlet automatic valve of the outlet pipe of the swirl type solid-liquid separator is controlled so that the differential pressure is within a predetermined range.

  In the operation control apparatus and operation control method for the swirling flow solid-liquid separation device of the present invention, the differential pressure between the inlet pressure and the outlet pressure of the swirling flow solid-liquid separation device is detected, and the differential pressure is predetermined. The opening degree of the outlet automatic valve of the outlet pipe of the swirl type solid-liquid separator is controlled so as to be within the range.

  Therefore, according to the operation control device and operation control method of the swirling flow solid-liquid separation device of the present invention, the differential pressure between the inlet pressure and the outlet pressure of the swirling flow solid-liquid separation device regardless of the flow rate variation of the slurry liquid. Is maintained within a certain range, even when the concentration of the slurry liquid is high, the weakening of the swirling flow due to the lack of differential pressure can be prevented and the coarse particles can be sufficiently separated from the slurry liquid, Further, it is possible to prevent the swirling flow from increasing due to the excessive differential pressure and to prevent the inner wall of the tank from being worn by coarse particles resulting from the winding of the concentrated slurry liquid accumulated at the lower end of the tank.

In the operation control device of the swirling flow solid-liquid separation device of the present invention, the concentrated slurry liquid concentration detecting means for detecting the concentrated slurry liquid concentration in the concentrated slurry liquid discharge pipe of the swirling flow solid-liquid separation device,
A concentrated slurry liquid discharge pressure detecting means for detecting the concentrated slurry liquid discharge pressure in the concentrated slurry liquid discharge pipe;
A discharge pipe automatic valve control means for opening an automatic valve of the concentrated slurry liquid discharge pipe when the detected concentration of the concentrated slurry liquid exceeds a predetermined level, and
The outlet automatic valve control means is configured such that when the discharge pipe automatic valve control means opens the automatic valve of the concentrated slurry liquid discharge pipe, the outlet automatic valve control means when the detected concentrated slurry liquid discharge pressure is negative. It is good also as making small the opening degree of.

  Further, in the operation control method of the swirl type solid-liquid separator of the present invention, the concentrated slurry liquid concentration in the concentrated slurry liquid discharge pipe of the swirl type solid-liquid separator and the concentrated slurry liquid discharge in the concentrated slurry liquid discharge pipe When the detected concentrated slurry liquid concentration exceeds a predetermined level, the automatic valve of the concentrated slurry liquid discharge pipe is opened, and in this case, when the detected concentrated slurry liquid discharge pressure is negative pressure May reduce the opening degree of the automatic outlet valve.

  In this way, when the concentration of the concentrated slurry liquid in the concentrated slurry liquid discharge pipe of the swirl type solid-liquid separation device becomes equal to or higher than a predetermined level, the automatic valve of the concentrated slurry liquid discharge pipe is opened, in which case the detected concentration is When the slurry discharge pressure is negative, the opening of the outlet automatic valve is reduced, and the concentrated slurry discharge pressure becomes positive even when the flow rate of the slurry is small, so the concentration of concentrated slurry increases excessively. The concentrated slurry liquid can be discharged through the concentrated slurry liquid discharge pipe from the lower end of the swirl type solid-liquid separator without any trouble before the operation.

Description schematically showing the configuration of an embodiment of the operation control device of the swirl type solid-liquid separation device of the present invention for carrying out one embodiment of the operation control method of the swirl type solid-liquid separation device of the present invention FIG. It is explanatory drawing which illustrates typically the structure of the operation control apparatus of the conventional swirl type solid-liquid separator for implementing the operation control method of the conventional swirl type solid-liquid separator of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the operation control device for the swirl type solid-liquid separation device of the present invention for carrying out one embodiment of the operation control method for the swirl type solid-liquid separation device of the present invention. It is explanatory drawing which shows a structure typically, In the figure, the part similar to the prior art example shown in FIG. 2 is shown with the same code | symbol.

  That is, the operation control device of the swirl type solid-liquid separation device of this embodiment performs operation control of a normal Lacos type swirl type solid-liquid separation device. A slurry liquid SL, which is cooling water sprayed onto a slab in a cooling facility of a continuous casting facility to cool the slab and mixed with solids (coarse particles) such as scales separated from the slab, has an inlet valve 1. Through the slurry liquid inlet pipe 2, it flows into the upper end inner peripheral passage in the tank 3 from the upper end portion of the sealed cylindrical tank 3 arranged in an inclined manner, and passes through the slits 4 arranged in a large number there to enter the inside of the tank 1. By entering the separation cylinder 5, it is accelerated in the tangential direction and descends in the separation cylinder 5 as a swirling flow.

  At that time, the coarse particles and the liquid of the slurry liquid SL are separated by a difference in centrifugal force and a difference in specific gravity between them. The coarse particles G settle to become concentrated slurry liquid CSL, and are intermittently or continuously discharged from the lower end of the tank 3 through the concentrated slurry liquid discharge pipe 8 having the concentrated slurry liquid discharge valve 7 to the outside. On the other hand, the processed liquid L from which the coarse particles G have been separated flows out from the upper end of the tank 3 through the discharge cylinder 9 at the inner central portion of the separation cylinder 5, and passes through the processed liquid outlet pipe 11. Go back to the cooling facility.

  However, in the operation control device of the swirl type solid-liquid separation device of this embodiment, the treated liquid outlet pipe 11 as the outlet pipe is provided with, for example, an electric outlet automatic valve 12 instead of the outlet manual valve 10, and the slurry. Pressure gauges 13 and 14 as differential pressure detecting means for measuring the pressures P1 and P2 in the pipes are provided in the liquid inlet pipe 2 and the processed liquid outlet pipe 11, respectively, and output signals of the pressure gauges 13 and 14 are provided. Is input to an outlet automatic valve control device 15 having, for example, a microcomputer as outlet automatic valve control means for controlling the operation of the outlet automatic valve 12.

  And in the operation control method of the swirl type solid-liquid separation device of this embodiment, the outlet automatic valve control device 15 operates according to a program given in advance, and as the inlet pressure based on the output signals of the pressure gauges 13 and 14. The pressure difference between the inner pressure P1 of the slurry liquid inlet pipe 2 and the inner pressure P2 of the treated liquid outlet pipe 11 as the outlet pressure is detected, and the outlet is adjusted so that the differential pressure is within a predetermined range, for example, 50 Pa to 90 Pa. The opening degree of the automatic valve 12 is controlled.

  Therefore, according to the operation control apparatus and operation control method of this embodiment, the pressure P1 in the slurry liquid inlet pipe 2 and the treated liquid outlet pipe of the swirl type solid-liquid separator regardless of the flow rate variation of the slurry liquid SL. 11 is maintained within a certain range, so even if the concentration of the slurry liquid is high, weakening of the swirling flow due to insufficient pressure difference is prevented, and coarse particles from the slurry liquid SL are prevented. The tank 3 can be sufficiently separated from the G, and can prevent the swirling flow from increasing due to the excessive differential pressure, thereby preventing the concentrated slurry liquid CSL accumulated at the lower end of the tank 3 from rolling up. It is also possible to prevent wear of the inner wall of the.

  Further, in the operation control device of the swirl type solid-liquid separator of this embodiment, the concentration is measured by measuring the concentration of the concentrated slurry liquid CSL in the concentrated slurry liquid discharge pipe 8 from, for example, the intensity of light passing through the concentrated slurry liquid. A concentrated slurry liquid concentration meter 16 as a slurry liquid concentration detecting means is provided, a pressure gauge 17 for measuring the pressure P1 ′ of the concentrated slurry liquid in the concentrated slurry liquid discharge pipe 8 is provided, and instead of the timer 6, for example, For example, a discharge pipe automatic valve control device 18 having a microcomputer is provided as a discharge pipe automatic valve control means for controlling the operation of the electric concentrated slurry liquid discharge valve 7. The output signal of the pressure gauge 17 is input to the discharge pipe automatic valve control device 18.

  In the operation control method of the swirling flow type solid-liquid separation device of this embodiment, the discharge pipe automatic valve control device 18 operates according to a program given in advance, and the concentration slurry concentration meter 16 detects and outputs the concentration. When the slurry liquid concentration exceeds a predetermined value within a possible range of smooth discharge of the concentrated slurry liquid CSL passing through the concentrated slurry liquid discharge pipe 8, the concentrated slurry liquid discharge valve 7 of the concentrated slurry liquid discharge pipe 8 is opened, The concentrated slurry liquid CSL is discharged from the lower end of the tank 3 to the outside through the concentrated slurry liquid discharge pipe 8 within a concentration that allows smooth discharge.

  Further, when the concentrated slurry liquid discharge valve 7 of the concentrated slurry liquid discharge pipe 8 is opened, the discharge pipe automatic valve control device 18 checks the pressure P1 ′ of the concentrated slurry liquid and the flow rate of the slurry liquid SL is small. When the pressure in the lower end of the tank 3 and thus the pressure P1 ′ of the concentrated slurry is negative, an instruction signal is output to the outlet automatic valve control device 15 to reduce the opening of the outlet automatic valve 12, Thus, the pressure in the lower end portion of the tank 3 is returned to a positive pressure, and the discharge of the concentrated slurry liquid CSL from the lower end portion of the tank 3 is promoted.

  Therefore, according to the operation control apparatus and the operation control method of this embodiment, even when the concentration of the slurry liquid SL is high, the concentration of the concentrated slurry liquid in the concentrated slurry liquid discharge pipe 8 of the swirling flow solid-liquid separation apparatus is not less than a predetermined value. Then, the concentrated slurry liquid discharge valve 7 of the concentrated slurry liquid discharge pipe 8 is opened, so that the concentrated slurry liquid CSL does not accumulate excessively and the concentrated slurry liquid discharge valve 7 of the concentrated slurry liquid discharge pipe 8 is opened. In addition, when the detected concentrated slurry liquid discharge pressure P1 ′ is a negative pressure, the opening degree of the outlet automatic valve 12 is reduced, and even when the flow rate of the slurry liquid SL is small, the concentrated slurry liquid discharge pressure P1 ′ is set to a positive pressure. Therefore, before the concentrated slurry liquid concentration rises excessively, the concentrated slurry liquid CSL is discharged through the concentrated slurry liquid discharge pipe 8 from the lower end of the swirl type solid-liquid separator without any trouble. It is possible.

  In addition, when the operation control device and the operation control method of this embodiment were applied to the Lacos type swirl type solid-liquid separation device that processes the slurry liquid in the cooling equipment of the continuous casting equipment, before application, the concentrated slurry liquid discharge pipe Although clogging occurred about 12 times per year, the concentrated slurry liquid discharge pipe was not clogged at all for one year after application.

  Although the present invention has been described based on the illustrated examples, the present invention is not limited to the above-described example. For example, the differential pressure between the inlet pressure and the outlet pressure of the swirl type solid-liquid separator is the same as that of the slurry liquid inlet pipe 2. Instead of obtaining the pressure difference between the pipe pressure P1 and the pipe pressure P2 of the treated liquid outlet pipe 11, from the concentrated slurry liquid discharge pressure P1 'in the concentrated slurry liquid discharge pipe 8, or either of the pipe pressures P1 and P2 You may make it estimate from. Further, the concentrated slurry liquid discharge pressure in the concentrated slurry liquid discharge pipe is determined from either or both of the pipe pressure P1 of the slurry liquid inlet pipe 2 and the pipe pressure P2 of the treated liquid outlet pipe 11 instead of being measured by the pressure gauge 17. It may be estimated.

  In the above example, the discharge pipe automatic valve control device 18 checks the pressure P1 ′ of the concentrated slurry liquid when opening the concentrated slurry liquid discharge valve 7 of the concentrated slurry liquid discharge pipe 8, and the pressure P1 of the concentrated slurry liquid. When 'is negative pressure, an instruction signal is output to the outlet automatic valve control device 15 to reduce the opening degree of the outlet automatic valve 12, but instead, for example, the discharge pipe automatic valve control device 18 is concentrated. When the concentrated slurry liquid discharge valve 7 of the slurry liquid discharge pipe 8 is opened, an instruction signal is output to the outlet automatic valve control device 15, and the outlet automatic valve control device 15 checks the pressure P1 ′ of the concentrated slurry liquid to check the concentrated slurry. When the pressure P1 ′ of the liquid is a negative pressure, control for reducing the opening degree of the automatic outlet valve 12 may be performed. Alternatively, instead of the outlet automatic valve control device 15 and the discharge pipe automatic valve control device 18, one integrated control device having the functions of both control devices may be provided.

  Furthermore, although the above-mentioned example is applied to a Lacos type swirling flow solid-liquid separation device, the present invention is not limited to this, and can be applied to, for example, a cyclone swirling flow solid-liquid separation device.

  Thus, according to the operation control apparatus and operation control method of the swirling flow type solid-liquid separation device of the present invention, the differential pressure between the inlet pressure and the outlet pressure of the swirling flow type solid-liquid separation device is increased regardless of the flow rate fluctuation of the slurry liquid. Since it is maintained within a certain range, even when the concentration of the slurry liquid is high, weakening of the swirling flow due to insufficient differential pressure can be prevented, and the coarse particles can be sufficiently separated from the slurry liquid. It is possible to prevent the swirling flow from being strengthened due to the excessive differential pressure and to prevent the inner wall of the tank from being worn by coarse particles due to the winding of the concentrated slurry liquid accumulated at the lower end of the tank.

DESCRIPTION OF SYMBOLS 1 Inlet valve 2 Slurry liquid inlet pipe 3 Tank 4 Slit 5 Separation cylinder 6 Timer 7 Concentrated slurry liquid discharge valve 8 Concentrated slurry liquid discharge pipe 9 Discharge cylinder 10 Outlet manual valve 11 Processed liquid outlet pipe 12 Outlet automatic valve 13,14, 17 Pressure gauge 15 Outlet automatic valve control device 16 Concentrated slurry liquid concentration meter 18 Discharge pipe automatic valve control device CSL concentrated slurry liquid G Coarse grain L Processed liquid SL Slurry liquid

Claims (4)

Differential pressure detection means for detecting the differential pressure between the inlet pressure and the outlet pressure of the swirling flow solid-liquid separator;
An automatic outlet valve provided in the outlet pipe of the swirling flow solid-liquid separator;
Outlet automatic valve control means for controlling the opening degree of the outlet automatic valve so that the differential pressure falls within a predetermined range;
An operation control device for a swirling flow type solid-liquid separation device. A concentrated slurry liquid concentration detecting means for detecting the concentrated slurry liquid concentration in the concentrated slurry liquid discharge pipe of the swirling flow solid-liquid separator;
A concentrated slurry liquid discharge pressure detecting means for detecting the concentrated slurry liquid discharge pressure in the concentrated slurry liquid discharge pipe;
A discharge pipe automatic valve control means for opening an automatic valve of the concentrated slurry liquid discharge pipe when the detected concentration of the concentrated slurry liquid is equal to or higher than a predetermined value;
With
The outlet automatic valve control means is configured such that when the discharge pipe automatic valve control means opens the automatic valve of the concentrated slurry liquid discharge pipe, the outlet automatic valve control means when the detected concentrated slurry liquid discharge pressure is negative. 2. The operation control device for a swirl type solid-liquid separator according to claim 1, wherein the opening degree of the swirl type is reduced. Detect the differential pressure between the inlet pressure and outlet pressure of the swirling flow solid-liquid separator,
An operation control method for a swirling flow solid-liquid separation device, wherein the opening degree of the outlet automatic valve of the outlet pipe of the swirling flow solid-liquid separation device is controlled so that the differential pressure falls within a predetermined range. Detecting the concentrated slurry liquid concentration in the concentrated slurry liquid discharge pipe of the swirl type solid-liquid separator and the concentrated slurry liquid discharge pressure in the concentrated slurry liquid discharge pipe;
When the detected concentration of the concentrated slurry liquid is equal to or higher than a predetermined level, the automatic valve of the concentrated slurry liquid discharge pipe is opened,
4. When the automatic valve of the concentrated slurry liquid discharge pipe is opened and the detected concentrated slurry liquid discharge pressure is negative, the opening degree of the outlet automatic valve is reduced. The operation control method of the swirl type solid-liquid separation device described.

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