KR19990083831A - Zone filtering unit - Google Patents

Abstract

The present invention relates to a zone filtering unit for secondly filtering coolant supplied to a continuous casting machine, the main filter unit filtering first coolant, and a coolant supply line for supplying firstly filtered coolant from the main filter unit. And a branching zone branched to supply the cooling water supplied from the cooling water supply pipe to the plurality of nozzle portions, wherein the cooling water supplied from the main filter part is positioned near the branching zone of the cooling water supply pipe. The secondary filtering means for filtering again removes impurities in the cooling water and predicts a blockage of the cooling water nozzle.

Description

Zone filtering unit

The present invention relates to a zone filtering unit for secondly filtering coolant supplied to a continuous casting machine. In particular, the present invention relates to a zone close to a branch zone of a cooling water supply line connected to a main filter part for firstly filtering the cooling water supplied to a continuous casting machine. A zone filtering unit, which is a differential filtering means, is provided to remove impurities in the cooling water and to predict a blockage of the cooling water nozzle.

Generally, as shown in FIG. 1, the continuous casting machine 1 is provided with the inner bow 2 and the outer bow 3, and guide rolls which guide the cast pieces to the pockets 3 of the inner and outer bows, respectively ( 5) is seated.

In addition, a plurality of nozzles (not shown) are provided in the vicinity of the continuous casting machine to spray cooling water for cooling the slab flowing along the continuous casting machine.

Accordingly, when the first filtered coolant is sent to the plurality of nozzles through the branch zone along the cooling water supply line through the main filter part, which is a cooling water treatment device, the coolant is injected by the plurality of nozzles.

However, as described above, the cooling water supply line of the continuous casting machine has a cooling water filtering facility such as the main filter part, but even after the primary filtering by the main filter part, the clogging of the nozzle by the pipe scale (oxide and other contaminants) is serious. Because of this, it was always difficult to spray nozzles of a certain quantity and pressure.

For example, if the nozzle is clogged while the steam layer is formed on the cast steel having a high temperature of 1100 ° C. or higher, cooling of the cast steel is stable because the cooling water does not reach the surface of the cast steel due to the lack of water sprayed from the nozzle. There was a problem that the condition could not be maintained.

In order to solve the above problems, the present invention includes a secondary filtering means at a position close to the branch zone of the cooling water supply line connected to the main filter unit for primary filtering the cooling water supplied to the continuous casting machine to remove impurities in the cooling water. At the same time, it is an object of the present invention to provide a zone filtering unit for predicting clogging of the cooling water nozzle.

As a technical idea for achieving the object of the present invention, the main filter unit for filtering the coolant primarily, the coolant supply pipe for supplying the coolant filtered primarily from the main filter unit, and the plurality of coolant supplied from the coolant supply pipe A cooling water treatment apparatus comprising a branching zone branched to supply to a nozzle unit of the invention, comprising: secondary filtering means for re-filtering the cooling water supplied from the main filter unit at a position close to the branching zone of the cooling water supply line. This is presented.

1 is a schematic diagram showing a general continuous casting machine.

2 is a schematic view showing a cooling water treatment process according to the present invention.

3 is a diagram illustrating an embodiment of a zone filtering unit according to the present invention.

4 is a view showing another embodiment of a zone filtering unit according to the present invention.

5 is a view showing another embodiment of a zone filtering unit according to the present invention.

<Code Description of Main Parts of Drawing>

10: main filter unit 11: coolant supply line

12 nozzle part 13 branch zone

14: first pipe line portion 15: second pipe line portion

16: filter housing 17: inlet

18: outlet 19: mesh filter

20: cooling water filter portion 21: bypass pipeline portion

22: first opening and closing means 23: second opening and closing means

24: third opening and closing means 25: the first hydraulic meter

26: second hydraulic pressure gauge 27: flange

28: gasket 29: fixing bolt

30: drain valve 31: contact pressure gauge

32: warning light 33: first pressure transducer

34 second pressure converter 40 secondary filtering means

Hereinafter, with reference to the accompanying drawings for the configuration and operation of the embodiment of the present invention will be described in detail.

As shown in FIG. 2, FIG. 3, FIG. 4, and FIG. 5, the present invention provides a main filter unit 10 for filtering the coolant first, and for supplying the primary filtered coolant from the main filter unit 10. FIG. In the cooling water treatment apparatus which consists of a cooling water supply line 11 and the branch zone 13 which branches to supply the cooling water supplied from the said cooling water supply line 11 to the some nozzle part 12,

Secondary filtering means 40 for filtering the cooling water supplied from the main filter unit 10 at a position close to the branch zone 13 of the cooling water supply line 11 is provided.

In addition, the secondary filtering means 40 is connected to the first pipe line portion 14 fastened by the predetermined fastening means to the cooling water supply line 11 and the predetermined fastening means at a position close to the branch zone 13. A filter housing 16 formed of a cylindrical transparent resin provided between the second pipe line portion 15 and the first pipe line portion 14 and the second pipe line portion 15, which are fastened by A coolant filter unit 20 formed of an inlet 17 and an outlet 18 formed at a lower portion of the housing 16, and a mesh filter 19 that is fitted inside the outlet 18 to filter the coolant; A bypass pipe line portion connected to an inlet side of the first pipe line portion 14 and an outlet side of the second pipe line portion 150 to bypass the cooling water without passing through the cooling water filter portion 20 as necessary ( 21) and. First, second and third opening and closing means 22 and 23 provided in the middle of the first and second pipe line parts 14 and 15 and the bypass pipeline part 21 respectively to open and close the flow of the cooling water. 24 and the first and second hydraulic pressure gauges 25 provided at the inlet and outlet side of the cooling water filter unit 20 and the first and second pipe line units 14 and 15, respectively, to measure the hydraulic pressure of the cooling water. And 26).

The first and second opening and closing means 22 and 23 may be ball valves when the lengths of the first and second pipe line portions 14 and 15 are greater than or equal to a predetermined length. It consists of a fly valve.

In addition, the second hydraulic pressure gauge 26 may be configured as a contact pressure gauge that moves only when the guide is set at a predetermined pressure so that the current pressure is less than the set pressure.

In addition, the fastening means is composed of a fixing bolt 29 for fastening the flange portion 27 and the flange portion 27 provided at the end of each of the pipeline portion with a gasket 28 therebetween.

In addition, the bottom surface of the coolant filter unit 20 is further provided with a drain valve 30 for discharging the coolant accumulated in the filter housing 16 as needed.

In addition, one side of the contact pressure gauge 31 is further provided with a warning light 32 that is turned on when the current water pressure measured by the contact pressure gauge 31 is less than the set pressure.

In addition, one side of the first and second pressure gauges 25 and 26 converts the measured analog pressure signal into a digital signal and sends the first and second pressure transducers 33 to the control means (not shown). 34) is further provided.

Referring to the operation of the present invention having the configuration as described above are as follows.

Generally, the steelmaking, casting, cold rolling or hot rolling processes in the steelmaking and steelmaking fields require the supply of cooling water to cool the hot slabs. In order to prevent clogging of the cooling water nozzles due to the pipe scale (oxides and contaminants) after filtering in the supply process of the cooling water, the present invention provides a cooling water filtering device installed in the secondary cooling water supply line of the continuous casting machine in steel mill facilities. Providing.

That is, the zone filtering unit according to the present invention is close to the branch zone 13 of the cooling water supply line 11 for supplying the cooling water filtered by the main filter unit 10 which primarily filters the cooling water as shown in FIG. 2. The secondary filtering means 40 is provided at the position to allow the cooling water to be filtered secondly.

Cooling water filtering process according to the present invention is as follows.

First, the primary filtered coolant from the main filter unit 10 flows into the first pipe line unit 14 of the zone filtering unit according to the present invention along a cooling water supply line, wherein the first pipe line unit 14 The coolant water pressure flowing through the pipe is measured by the first hydraulic pressure gauge 25 provided in the first pipe line portion 14.

The coolant that has passed through the first pipe line portion 14 immediately flows into the inlet of the coolant filter part 20 and is filled in the filter housing 16. In this case, a mesh fitted inside the outlet of the coolant filter part 20 is provided. Cooling water is secondarily filtered by the filter 19.

In this case, since the filter housing 16 is made of a cylindrical transparent acrylic, the manager can easily check the state of the mesh filter 19 with the naked eye, and accordingly, after the first filtering on the mesh filter 19, If pipe scales (oxides and other contaminants) accumulate, they can be replaced immediately by an administrator.

The secondary filtered coolant from the mesh filter 19 of the coolant filter unit 20 is discharged to the outlet 18 and then directed to the branch zone 13 through the second pipe line unit 15. The water pressure of the coolant passing through the coolant filter unit 20 is measured by the second hydraulic pressure gauge unit 26 provided in the second pipe line unit 15.

Therefore, the manager visually checks the hydraulic pressure value indicated by the instructions of the first hydraulic pressure gauge 25 and the second hydraulic pressure gauge 26 so that the hydraulic pressure value of the second hydraulic pressure gauge 26 is equal to the first hydraulic pressure gauge. When it is less than the water pressure value of 25, it can be estimated that a lot of contaminants accumulated in the mesh filter 19 of the cooling water filter unit 20.

For reference, as shown in FIG. 3, first and second pressure transducers 33 and 34 are further provided at one side of the first and second pressure gauges 25 and 26, respectively, and each of the hydraulic pressures measured as analog signals. When the value data is converted into a digital signal and sent to the control means, the control means may compare the two measured values to determine whether or not there is a contaminant.

As described above, when a large amount of contaminants accumulates in the mesh filter 19 of the coolant filter unit 20 and a difference occurs in the measured water pressure of the first and second hydraulic pressure gauges 25 and 26, the mesh filter 19 is immediately replaced. In order to replace the mesh filter 19, the manager first opens the ball valve, which is the third opening and closing means 24, which is closed in the normal state, and then opens the first and second opening and closing means in the open state sequentially. Just close (22, 23).

When the manager opens the drain valve 30 provided at the bottom of the coolant filter unit 20 after the series of operations as described above, the coolant discharged from the filter housing 16 of the coolant filter unit 20 is discharged. Will be.

When all the coolant filled in the filter housing 16 is discharged, the manager separates the filter housing 16 by using a predetermined extension, and then removes the mesh filter 19 inserted into the lower outlet of the coolant filter unit 20. Then, the filter housing 16, which has been inserted and removed from the new mesh filter, may be reassembled.

For reference, the first and second opening and closing means 22 and 23 may selectively use a ball valve or a butterfly valve according to the space of the first and second pipe line parts 14 and 15. That is, a ball valve may be used when the length of the pipeline is a certain length, for example, 900 mm or more, and a butterfly valve may be used when the length of the pipeline is less than 900 mm.

Of course, in the case of the third opening and closing means 24, since the length of the pipeline is always 900 mm or more, the ball valve is used.

On the other hand, when the contamination of the coolant filter unit 20 can be used as a warning light for a more rapid warning, such a warning light 32 may be installed as shown in FIG.

That is, in order to install the warning lamp 32, the contact type pressure gauge 31 may be provided at the outlet side second pipe line part 15 of the cooling water filter part 20. The guideline is set at a constant pressure so that it will only move if the current pressure is below the set pressure. The water pressure set here represents the water pressure in a steady state.

Therefore, if the water pressure of the cooling water passing through the second pipe line part 15 through the coolant filter part 20 currently measured by the contact pressure gauge 31 falls short of the normal pressure set by the contact type. The warning lamp 32 provided on one side of the pressure gauge 31 is turned on so that the manager can quickly know when to replace the mesh filter 19.

As can be seen from the above description, the present invention, the main filter unit 10 for filtering the coolant first, the coolant supply pipe 11 for supplying the coolant filtered primarily in the main filter unit 10, In the cooling water treatment device comprising a branch zone 13 for branching to supply the cooling water supplied from the cooling water supply pipe 11 to the plurality of nozzles (12),

Secondary filtering means 40 for re-filtering the cooling water supplied from the main filter unit 10 at a position proximate to the branch zone 13 of the cooling water supply line 11 removes impurities in the cooling water to remove the cooling water. Clogging of the nozzle portion 12 can be prevented.

In addition, according to the present invention, clogging of the coolant nozzle part 12 due to the coolant pressure difference can be predicted by using the first and second hydraulic pressure gauges 25 and 26 provided at the inlet and the outlet of the coolant filter unit 20. have.

In addition, the filter housing 16 according to the present invention may be made of cylindrical transparent acrylic, and the degree of contamination of the mesh filter 19 provided in the filter housing 16 may be visually replaced by an administrator.

In addition, according to the present invention, by installing a separate bypass pipeline portion 21, it is possible to replace the mesh filter 19 even during the operation of the facility.

Claims (7)

A main filter part for filtering the coolant firstly, a coolant supply pipe for supplying coolant filtered primarily from the main filter part, and a branching zone branching to supply the coolant supplied from the coolant supply pipe to the plurality of nozzle parts In the cooling water treatment apparatus, And second filtering means for re-filtering the cooling water supplied from the main filter part at a position close to the branch zone of the cooling water supply pipe. The method of claim 1, wherein the secondary filtering means and the first pipe line portion is fastened by the fastening means to the cooling water supply pipe; A second pipe line portion fastened by a fastening means at a position close to the branch zone; A filter housing formed between the first pipe line portion and the second pipe line portion and formed of a cylindrical transparent resin, an inlet / outlet formed at a lower side of the filter housing, and a mesh that is fitted inside the outlet to filter cooling water; Cooling water filter section consisting of a filter, A bypass pipeline portion connected to an inlet side of the first pipe line portion and an outlet side of the second pipe line portion to bypass the cooling water without passing through the cooling water filter portion, if necessary. First, second and third opening and closing means respectively provided in the middle of the first and second pipeline parts and the bypass pipeline part to open and close the flow of the cooling water; And a first and a second hydraulic pressure gauge provided at each of the first and second pipe line parts of the inlet and the outlet side of the coolant filter unit to measure the hydraulic pressure of the coolant. The said 1st, 2nd opening and closing means is comprised by the ball valve, when the length of the said 1st, 2nd pipe line part is more than predetermined length, and when it is less than the predetermined length, It is comprised by the butterfly valve, It is characterized by the above-mentioned. Zone filtering unit. The zone filtering unit according to claim 2, wherein the second hydraulic pressure gauge unit is configured as a contact pressure gauge that moves only when the guide pressure is set to a constant pressure so that the current hydraulic pressure is less than the set pressure. The zone filtering unit according to claim 2, wherein a bottom valve of the coolant filter unit is further provided with a drain valve for discharging the coolant accumulated in the filter housing as needed. The zone filtering unit according to claim 5, wherein one side of the contact pressure gauge is further provided with a warning light to turn on the warning light when the current water pressure measured by the contact pressure gauge falls short of the set pressure. The zone of claim 2, wherein one side of the first and second pressure gauges is further provided with first and second pressure transducers for converting the measured analog pressure signal into a digital signal and sending the same to the control means. Filtering unit.