JP6658156B2 - Ignition method of scarfer equipment - Google Patents

Description

  The present invention relates to a method of igniting a combustible gas supplied from a scarfer unit disposed around a slab in a scarfer equipment for fusing the surface of a slab.

On the surface of the slab manufactured by continuous casting, surface defects such as inclusions and surface defects may occur.
When removing such surface defects of the slab, for example, the scarfer equipment disclosed in Patent Documents 1 and 2 is used. These scarfer facilities locally heat and melt the surface of the slab to remove surface defects.

  In the above-mentioned scarfer equipment, a scarfer unit is arranged around a slab, and usually, one long-side face scarfer unit and another long-side face which are arranged opposite to two long-side faces of the slab, respectively. It has a surface scarfer unit, and one short side scarfer unit and another short side face scarfer unit which are respectively opposed to two short side surfaces of the slab.

In the scarfer equipment having such a configuration, first, a flammable gas is supplied from the above-described scarfer unit, and the flammable gas is ignited (ignition step). When igniting the combustible gas supplied from the scarfer unit, an igniter (ignition device) is used.
Next, a part of the surface of the slab is melted by the heat of the combustible combustible gas to form a pool and serve as a heat source (preheating step).
Next, an oxygen gas is supplied toward the pool, and the slab surface is melted to a depth of about 1 to 3 mm by the heat of the oxidation reaction between the oxygen gas and the iron to remove surface defects (abrasion step).

JP 2000-094124 A JP 2003-010966 A

Here, when the flammable gas supplied from the scarfer unit is ignited by the ignition device, the flammable gas is simultaneously supplied to each of the scarfer units to ignite. Simultaneous ignition is performed because there is no trouble in the work surface for increasing the ignition timing and no increase in equipment cost, and it is advantageous in terms of securing productivity. As a result, noise and vibration were sometimes generated. As described above, noise and vibration are generated when the flammable gas is ignited, so that there is a problem that the equipment is deteriorated at an early stage or the working efficiency is reduced.
In addition, in the above-mentioned scarfer equipment, there is a case where 300 or more slabs are cut a day, and the frequency of ignition of the flammable gas is increased. Is required.

  The present invention has been made in view of the above situation, and provides an ignition method for a scarfer facility capable of suppressing generation of noise and vibration when igniting a combustible gas supplied from a scarfer unit. The purpose is to provide.

  In order to solve the above-described problems, the present inventors have conducted intensive studies and found that, when the combustible gas is ignited in a state where the combustible gas is retained in the space between the slab and the scarfer unit, large noise and vibration are generated. Was found to occur.

The present invention has been made based on the above findings, and a method of igniting a scarfer facility according to the present invention is directed to a scarfer provided around the slab in the scarfer facility for fusing the surface of the slab. What is claimed is: 1. A method for igniting a flammable gas supplied from a fur unit, comprising: a supply path for supplying the flammable gas; and a pressure reducing valve provided upstream of the supply path. And a shut-off valve disposed downstream of the pressure reducing valve. When the supply of the flammable gas is stopped, after the pressure reduction is started by the pressure reducing valve, a predetermined time (1.0 sec. After the lapse of 2.5 seconds or less), the shutoff valve is shut off to suppress the flammable gas from remaining between the pressure reducing valve and the shutoff valve. Suppresses stagnation of the flammable gas in the space between the skirt fur unit and said slab, by igniting the combustible gas is characterized by suppressing the generation of noise and vibration.

  In the ignition method of the scarfer equipment having this configuration, the flammable gas is ignited without retaining the flammable gas in the space between the scarfer unit and the slab at a predetermined amount or more. Generation of loud noise and vibration at the time of ignition of the combustible gas can be suppressed. That is, by immediately igniting the combustible gas supplied from the scarfer unit, it is possible to suppress the stagnation of the combustible gas and suppress the generation of noise and vibration.

Further, when the supply of the flammable gas is stopped, after the pressure is reduced by the pressure reducing valve provided on the upstream side of the supply path, and after a predetermined time has elapsed, the shutoff valve is shut off, so that the pressure reducing valve is The combustible gas can be prevented from remaining between the shut-off valve and the shut-off valve. Therefore, at the time of the next ignition, when the shut-off valve is opened, the flammable gas can be prevented from staying in the space between the scarfer unit and the slab, and the generation of noise and vibration at the time of ignition can be suppressed. It is possible to do.

Further, since the shut-off valve is shut off after elapse of 1.0 sec or more after the start of the depressurization by the pressure reducing valve, it is possible to prevent the flammable gas from remaining between the pressure reducing valve and the shut-off valve. it can.
In addition, since the shut-off valve is shut off 2.5 seconds or less after the start of the depressurization by the pressure-reducing valve, the shut-off valve is not opened more than necessary, so that foreign matter may not be mixed into the supply path. The occurrence of flashback can be suppressed .

Further, the method for igniting a car furnishing apparatus according to the present invention is a method for carving a combustible gas supplied from a car furing unit provided around a slab in a car furying apparatus for fusing the surface of a slab. The ignition method, wherein the scarfer unit includes one long-sided scarf unit and another long-sided scarf unit which are respectively disposed opposite to two long-side surfaces of the slab, and two of the slabs. Having one short side scarfer unit and another short side scarfer unit arranged opposite to the short side face, respectively, one long side scarfer unit and another long side scarfer unit, and The flammability of one of the short-sided scarf units and one of the other short-sided scarf units. Scan after ignition by supplying, are the following Scar fur unit configured to ignite by supplying the combustible gas, the time from the ignition of one Scar Fur unit to ignite the next Scar fur units 1.0 second or less , suppressing the flammable gas in the space between the scarfer unit and the slab , suppressing the generation of noise and vibration by igniting the flammable gas. Features.

  In the ignition method of the scarfer equipment having this configuration, the one of the long side face scarfer unit and the other long side face scarfer unit and the one short side face and the other short side face scarfer unit After supplying and igniting the flammable gas from one scarfour unit, the flammable gas is supplied and ignited from the next scarfur unit. After igniting the flammable gas, the flammable gas is supplied from another scarfer unit, and the flammable gas before ignition is prevented from staying in the space between the scarfer unit and the slab. it can. Therefore, generation of noise and vibration during ignition can be suppressed.

  Here, in the above-described method for igniting the scarfer equipment of the present invention, the one short-sided scarf unit is first ignited, and then the one long-sided scarf unit or another long-sided scarf unit is lit. Preferably, one of the scarfer units is ignited.

  In this case, the short side face scarfer unit can perform ignition before a large amount of the flammable gas stays because the supply amount of the flammable gas is small. Next, in a state where the combustible gas from the one short-sided scarf unit is ignited, one of the one long-sided scarf unit and the other long-sided scarf unit is ignited. Therefore, it is possible to promote the ignition in the long side face scarfur unit by utilizing the combustion in the one short side face scarfur unit.

  As described above, according to the present invention, it is possible to provide an ignition method for a scarfer facility capable of suppressing generation of noise and vibration when igniting a combustible gas supplied from a scarfer unit.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic explanatory drawing of the scarfer equipment to which the ignition method of the scarfer equipment which is embodiment of this invention is applied. It is explanatory drawing which shows the arrangement | positioning of the supply path of combustible gas, the pressure reducing valve, and the shutoff valve in the scarfer installation shown in FIG. It is a graph which shows the change of the combustible gas pressure in a scarfer installation. (A) shows a conventional method for igniting a scarfer facility, and (b) shows a method for igniting a scarfer facility according to the first embodiment. It is a graph which shows the change of the flammable gas pressure after a pressure reduction is started by a pressure reducing valve. It is a flow figure of the ignition method of the scarfer equipment which is a 2nd embodiment.

  Hereinafter, a method for igniting a scarfer facility according to an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiments.

First, a description will be given, with reference to FIG. 1 and FIG. 2, of a scarfer facility 10 to which a method for igniting a scarfer facility according to an embodiment of the present invention is applied.
The scarfer equipment 10 removes surface defects of the slab 1 by locally heating and melting the surface of the slab 1.

As shown in FIG. 1, the scarfer equipment 10 has a scarfer unit 20 arranged so as to surround the slab 1. In the present embodiment, the scarfer unit 10 faces two long side surfaces of the slab 1. The one long-sided scarf unit 21 and the other long-sided scarf unit 22 and the one short-sided scarf unit 23 and the other short-sided scarf unit 23 which are respectively arranged opposite to the two short-side surfaces of the slab 1 are arranged. And a short side scarf unit 24.
Each of the one long-sided scarf unit 21 and the other long-sided scarf unit 22, the one short-sided scarf unit 23 and the other short-side scarf unit 24 are provided with the flammable gas supply means 12. Are arranged.

  Further, as shown in FIG. 1, one long side scarf unit 21 and another long side scarf unit 22 are each divided into a plurality of blocks, and one short side scarf unit 23 and The other short side face scarfer units 24 are each configured by one block. In addition, these blocks of the scarfer unit 20 are provided with a plurality of parallel gas supply holes that open toward the slab 1, and the flammable gas is supplied to the entire long side surface and short side surface of the slab 1. It can be supplied.

As shown in FIG. 2, the flammable gas supply means 12 includes a supply path 13, a pressure reducing valve 15 provided upstream of the supply path 13, and a shutoff valve disposed downstream of the pressure reduction valve 15. And a valve 16.
Here, as shown in FIG. 2 in the present embodiment, one long-sided scarf unit 21 and another long-sided scarf unit 22, one short-sided scarf unit 23, and another short-sided scarf The fur unit 24 is arranged on the trolley 11 that can traverse the conveyance path of the slab 1. For this reason, a hose 14 is provided between the pressure reducing valve 15 and the shutoff valve 16 in the supply path 13 described above.

  In the scarfer equipment 10, an igniter 18 for igniting the combustible gas supplied from the scarfer unit 20 toward the slab 1 is provided. In the present embodiment, as shown in FIG. 1, the igniter 18 is provided on one short side surface scarfer unit 23 side.

In the scarfer facility 10 having such a configuration, first, the combustible gas is supplied from the above-described scarfer unit 20, and the combustible gas is ignited using the igniter 18 (ignition step).
Next, a part of the surface of the slab 1 is melted by the heat of the combustible combustible gas to form a pool, which is used as a heat source (preheating step).
Next, an oxygen gas is supplied toward the pool, and the surface of the slab 1 is melted by a heat of oxidation reaction between the oxygen gas and iron to a depth of about 1 to 3 mm to remove surface defects of the slab 1 (cutting). Process).

  In the ignition method of the scarfer equipment 10 according to the present embodiment, in order to suppress noise and vibration in the above-described ignition step, the combustible gas is supplied to the space between the scarfer unit 20 and the slab 1 in a predetermined amount or more. The flammable gas supplied from the scarfer unit 20 is ignited without stagnation.

(First embodiment)
First, an ignition method of the scarfer equipment 10 according to the first embodiment will be described with reference to FIGS.
In the first embodiment, when the ignition step, the preheating step, and the fusing step by the scarfer equipment 10 are repeatedly performed, the noise and the noise generated when the next ignition step is performed after the previous fusing step are completed. Vibration is suppressed.

  Conventionally, as shown in FIG. 3A, when the previous fusing step is completed, the pressure reducing valve 15 and the shutoff valve 16 of the combustible gas supply means 12 are simultaneously closed. For this reason, the residual pressure of the flammable gas becomes high even after the end of the fusing step. In this state, the flammable gas remaining between the pressure reducing valve 15 and the shut-off valve 16 when the shut-off valve 16 is opened in order to perform the next ignition process is removed by the scarfer unit 20 and the slab 1. And the noise and vibration may be generated at the time of ignition.

  Therefore, in the ignition method of the scarfer equipment 10 according to the first embodiment, as shown in FIG. 3B, when the previous fusing step is completed, first, the pressure reduction is started by the pressure reducing valve 15. The shut-off valve 16 is shut off after a lapse of a predetermined time. Specifically, the operation timing of the pressure reducing valve 15 and the operation timing of the shutoff valve 16 are adjusted by using a timer.

  As described above, by adjusting the operation timing of the pressure reducing valve 15 and the operation timing of the shutoff valve 16, the residual pressure of the flammable gas after the end of the fusing step can be reduced. Therefore, the flammable gas can be prevented from remaining between the pressure reducing valve 15 and the shutoff valve 16, and the flammable gas is removed from the space between the scarfer unit 20 and the slab 1 when the next ignition step is performed. Therefore, it is possible to suppress the stagnation in the air.

Here, in the present embodiment, it is preferable that the predetermined time from when the pressure reduction is started by the pressure reducing valve 15 to when the shutoff valve 16 is shut off be in the range of 1.0 sec to 2.5 sec. As shown in FIG. 4, it is confirmed that the pressure of the flammable gas is almost zero three seconds after the start of the pressure reduction by the pressure reducing valve 15.
Therefore, by setting the lower limit of the predetermined time from the start of the pressure reduction by the pressure reducing valve 15 to the closing of the shutoff valve 16 to 1.0 sec or more, the flammable gas can be sufficiently reduced in pressure, and Combustible gas can be prevented from remaining between the valve 16 and the valve 16 by a predetermined amount or more.
On the other hand, by setting the upper limit of the predetermined time from when the pressure reduction is started by the pressure reducing valve 15 to when the shutoff valve 16 is shut off to 2.5 seconds or less, it is possible to suppress the entry of foreign substances into the supply path 13 and the occurrence of flashback. be able to.

In order to further suppress the flammable gas remaining between the pressure reducing valve 15 and the shutoff valve 16, the lower limit of a predetermined time from when the pressure reduction is started by the pressure reducing valve 15 to when the shutoff valve 16 is shut off is set. More preferably, it is 1.5 sec or more.
Further, in order to further suppress the intrusion of foreign matter into the supply passage 13 and the occurrence of flashback, the upper limit of the predetermined time from when the pressure reduction is started by the pressure reducing valve 15 to when the shutoff valve 16 is shut off is set to 2.0 seconds or less. More preferably,

(Second embodiment)
Next, a method for igniting the scarfer equipment 10 according to the second embodiment will be described with reference to FIGS. 1, 2, and 5. FIG.
In the second embodiment, noise and vibration at the time of performing the ignition step are suppressed by controlling the order of ignition of the scarfer unit in the ignition step by the scarfer facility 10.

  In the second embodiment, as shown in FIG. 5, first, a flammable gas is supplied toward the slab 1 from one short side surface scarfer unit 23 in which the igniter 18 is disposed in the vicinity. The neutral gas is ignited (first scarfer unit ignition step S01). Since the igniter 18 is arranged in the vicinity, the combustible gas supplied from the one short side face scarfer unit 23 can be immediately ignited, and the one short side face scarfer unit 23 The flammable gas hardly stays in the space between the slab 1 and the slab 1.

Next, a flammable gas is supplied toward the slab 1 from one of the one long-side surface scarfer unit 21 and the other long-side surface scarfer unit 22, and the flammable gas is ignited (second scar). Fur unit ignition step S02).
Here, in consideration of the flow of the flammable gas and the like, the long side surface of the one long side surface scarfer unit 21 or the other long side surface scarfer unit 22 on which the flammable gas is less likely to stay is used. It is preferable to ignite the scarfer unit (in this embodiment, one long side face scarfer unit 21) in the second scarfer unit ignition step S02.

Next, a combustible gas is supplied from the other short side face scarfer unit 24 toward the slab 1 and the combustible gas is ignited (third scarfer unit ignition step S03).
At this time, since the flammable gas is burned in either one of the long side surface scarfer units 21 or the other long side surface scarfer unit 22, the other short side surface scars disposed opposite to the igniter 18 are burned. In the fur unit 24 as well, ignition of the combustible gas is promoted.

Next, of the one long-sided scarf unit 21 or the other long-sided scarf unit 22, the long-sided scarf unit which is not ignited in the second scarfer unit ignition step S04 (the present embodiment) Then, a flammable gas is supplied from the other long side surface scarfer unit 22) to the slab 1 and the flammable gas is ignited (fourth scarfer unit ignition step S04).
In the other long-sided scarf unit 22, the flammable gas tends to stay, but the flammable gas in the one short-sided scarf unit 23 and the other short-sided scarf unit 24 is already present. Is combusted, so that the ignition of the combustible gas is promoted also in the other long side surface scarfer unit 22.

As described above, in one of the long-sided scarf units 21 and the other long-sided scarf unit 22 and one of the short-sided scarf units 23 and the other short-sided scarf unit 24, the flammability is sequentially reduced. Since the configuration is such that the gas is supplied and ignited, the flammable gas before ignition can be prevented from staying more than necessary in the space between the scarfer unit 20 and the slab 1. Therefore, generation of noise and vibration during ignition can be suppressed.
From the viewpoint of securing the productivity, it is desirable that the time of each of S01 to S02, S02 to S03, and S03 to S04 be 1.0 second or less.

As described above, the method of igniting the scarfer equipment according to the present embodiment, which is the embodiment of the present invention, has been described. However, the present invention is not limited thereto, and may be appropriately changed without departing from the technical idea of the present invention. It is possible.
For example, the ignition method of the scarfer equipment according to the first embodiment may be combined with the ignition method of the scarfer equipment according to the first embodiment.

  In addition, when only the long side surface of the slab is ablated, as shown in the second embodiment, one short side scarfer unit and another short side scarfer unit are also ignited, After igniting one long-sided scarf unit and the other long-sided scarfur unit, the supply of combustible gas from one short-sided scarf unit and the other short-sided scarf unit is stopped. Is also good.

DESCRIPTION OF SYMBOLS 1 Slab 10 Scar fur equipment 13 Supply path 15 Pressure-reducing valve 16 Shut-off valve 18 Igniter 20 Scar fur unit 21 One long side face scar fur unit 22 Other long side face scar fur unit 23 One short side face scar fur unit 24 Other Short side scarf unit

Claims (3)

A method for igniting a combustible gas supplied from a scarfer unit disposed around a slab in a scarfer equipment for fusing the surface of a slab, comprising:
The scarfer unit has a supply path for supplying the flammable gas, a pressure reducing valve provided upstream of the supply path, and a shutoff valve provided downstream of the pressure reducing valve.
When the supply of the flammable gas is stopped, after the pressure is reduced by the pressure reducing valve, the shutoff valve is shut off after a lapse of a predetermined time (within a range of 1.0 sec to 2.5 sec). Suppressing that the flammable gas remains between the pressure reducing valve and the shutoff valve,
At the time of the next ignition, stagnation of the flammable gas in the space between the scarfer unit and the slab is suppressed, and ignition of the flammable gas suppresses generation of noise and vibration. Scar fur equipment ignition method. A method for igniting a combustible gas supplied from a scarfer unit disposed around a slab in a scarfer equipment for fusing the surface of a slab, comprising:
The scarfer unit includes one long-sided scarf unit and another long-sided scarf unit that are disposed to face two long-side faces of the slab, and faces two short-side faces of the slab. Having one short-sided scarf unit and another short-sided scarf unit arranged,
The flammable gas is supplied from one of the one long-sided scarf unit and the other long-sided scarf unit, and one of the short-sided scarf units and the other short-sided scarf unit. After supplying and igniting, the combustible gas is supplied and ignited from the next scarfer unit, and the time from the ignition of one scarfer unit to the ignition of the next scarfer unit is 1. 0 seconds or less,
Scarfer equipment characterized in that the flammable gas is prevented from staying in a space between the scarfer unit and the slab, and the flammable gas is ignited to suppress noise and vibration . Ignition method. Claim initially ignited narrow side Scar fur units of the one, then, characterized by igniting one of the one long side surface Scar Fur unit or other long side surface Scar fur units 3. The method for igniting a scarfer facility according to item 2 .

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