JP6361622B2 - Protective member for converter discharge, converter equipment and converter refining method - Google Patents

Description

  The present invention relates to a protective member used when a converter is discharged in a converter blowing process in a steelmaking process, a converter facility using the protective member, and a converter refining method.

  Conventionally, in converters, dephosphorization blowing and decarburization blowing have been the mainstream, and desiliconization processing has been performed in advance in converter preliminary processing equipment.

  On the other hand, in recent years, an operation method (for example, Patent Documents 1 and 2) in which desiliconization blowing is also performed in a converter is proposed for the purpose of effectively utilizing the combustion heat of silicon in molten iron by desiliconization treatment. ing.

  In this technique, after degassing the hot metal in the converter, intermediate degassing of the desiliconized slag is performed while leaving the desiliconized hot metal in the furnace, and then dephosphorization of the hot metal is performed.

JP 2013-231237 A JP 2014-159632 A

  By the way, when the slag is discharged while the hot metal remains in the converter in this way, the slag is scattered to the front side of the furnace because the molten metal is discharged at a shallower tilt angle than that after discharging the hot metal. Risk increases.

  In front of the furnace, there is a pair of shutters (also called charging doors and large doors) for the purpose of preventing molten steel and firewood scattering and smoke generation during blowing, and the shutters are closed when discharging. However, the slag scattered on the front side of the furnace during intermediate evacuation is in direct contact with the shutter, and there is a risk that soot will flow out of the gap to the front of the furnace.

  In order to solve this problem, technology is required to reliably prevent the intermediate slag from coming into direct contact with the shutter and the slag from flowing into the front of the furnace through the shutter gap without carrying out large-scale construction. However, no such technology has yet been proposed.

  As a result of repeated studies to solve the above-mentioned problems, the present inventor, when discharging the converter at a shallow tilt angle while leaving the hot metal in the converter, the shutter is disposed on the front side of the furnace where slag is scattered. The inventors have conceived that it is effective to provide a protective wall so as to cover the gap, and have completed the present invention.

That is, the present invention provides the following (1) to ( 7 ).

(1) In the converter equipment, it was provided on the front side of the furnace where the slag was scattered when the molten iron was discharged while leaving the hot metal inside the converter so as to cover the gap of the shutter provided on the front side of the converter. , have a protective wall surface portion is constituted by casting or refractory,
The protective wall is supported by a support base;
A sampling window is formed when the shutter is closed, and a frame that supports the protective wall of the support base is provided corresponding to the sampling window and does not hinder the opening and closing of the shutter. Protective member for furnace evacuation.

(2) pre-Symbol support base, a converter exhaust slag for protection member according to, characterized in that provided on the work floor in front furnace (1).

( 3 ) The protective member for converter excavation according to (1) or (2) , further comprising a crane mount on which a hook of an overhead crane is hung and detachable by a crane.

( 4 ) The protective wall includes a base member supported by the support base and a plurality of plates made of a casting or a refractory that are detachably attached to the surface of the base member (1). ) To ( 3 ), the protective member for converter discharge.

( 5 ) Any one of (1) to ( 4 ), characterized in that after desiliconization blowing in a converter, prior to dephosphorization blowing, it is used for intermediate removal of desiliconization slag. A protective member for converter discharge according to claim 1.

( 6 ) A converter facility comprising a converter and a furnace front provided with a shutter from the converter,
After the desiliconization blowing in the converter , the converter equipment covers the shutter on the front side of the furnace where the slag is scattered when the desiliconized slag is discharged before the dephosphorization blowing. And further comprising a protective member for converter evacuation having a protective wall whose surface portion is made of cast or refractory ,
The protective wall is supported by a support base;
A sampling window is formed when the shutter is closed, and a frame that supports the protective wall of the support base is provided corresponding to the sampling window and does not hinder the opening and closing of the shutter. Furnace equipment.

( 7 ) In the converter equipment, after desiliconization blow smelting in the converter, before dephosphorization blow slag,
The furnace front portion of the slag is scattered, the surface portion so as to cover the gap of the shutter provided in the furnace front of the converter is constituted by casting or refractory, it sets a supported protective barrier to the support,
A sampling window is formed when the shutter is closed, and a frame that supports the protective wall of the support base is provided corresponding to the sampling window so as not to prevent the opening and closing of the shutter. A converter refining method characterized by the above.

  According to the present invention, the surface portion is cast so as to cover the gap between the shutters provided on the furnace front side of the converter in the furnace front side portion where the slag is scattered when the molten iron is discharged while leaving the hot metal in the converter. Or by providing a protective wall made of refractory, it is possible to effectively prevent the slag from contacting the shutter and the slag from flowing out of the furnace through the gap of the shutter without carrying out large-scale construction. can do.

It is the schematic which shows the converter equipment using the protection member for converter waste which concerns on one Embodiment of this invention. It is a figure which shows the state which looked at the furnace front from the converter arrangement | positioning part of converter equipment. It is a side view which shows the protection member for converter waste. It is a top view which shows the protection member for converter waste. It is the figure which looked at the protective wall of the protective member for converter discharge from the converter side. It is a figure which shows the structure of the crane mount of the protection member for converter waste. It is the schematic which shows the state which is performing intermediate waste after desiliconization blowing in the converter equipment using the protective member for converter waste concerning one embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic view showing a converter facility using a converter waste protection member according to an embodiment of the present invention, and FIG. 2 is a view showing a state in which the front of the furnace is viewed from the converter placement portion of the converter facility. 3 is a side view showing a converter waste protection member, and FIG. 4 is a plan view showing the converter waste protection member.

  The converter facility 1 has a converter placement section 10 in which a converter 11 is present, and a portion adjacent to the converter placement section 10 is a furnace front 20 where hot metal is charged. A work floor 21 is provided in front of the furnace 20. In FIG. 1, the converter 11 has shown the state immediately after desiliconization blowing, L is hot metal, and S is desiliconization slag. In this embodiment, as will be described later, the converter 11 is tilted in the direction of arrow A on the front side of the furnace 11 while leaving the hot metal L in the converter 11, and the desiliconization slag S is discharged.

  A pair of shutters 22 that shut off the work floor 21 from the converter 11 during operation are provided at the converter side end of the furnace front 20. The shutter 22 is opened and closed by moving in the direction of arrow B in FIG. A converter waste protection member 30 is installed on the work floor 21 in front of the furnace 20.

  The converter waste protection member 30 has a protective wall 31 disposed so as to cover the gap of the shutter 22 on the front side of the furnace where slag is scattered when the hot metal L is left in the converter 11 while leaving the hot metal L. Have.

  The protective wall 31 is attached to a support base 32 having a frame shape. The support base 32 is placed on the work floor 21, and a weight attachment portion 33 for attaching a weight 34 for balancing is provided on the opposite side of the support base 32 from the protective wall 31. And the protection wall 31 is installed in a predetermined position by positioning the support base 32 in the predetermined position of the work floor 21. In addition, a crane mount 35 for hanging a hook 36 of an overhead crane is provided at the center of the support base 32. Therefore, the converter waste protection member 30 is detachable by the overhead crane.

  The protective wall 31 includes a frame-like base member 37 attached to the support base 32 and a plurality of plates 38 made of cast or refractory attached to the entire surface of the base member 37 on the converter side. . When the plate 38 is made of a casting or a refractory material, necessary heat resistance can be ensured. Among these, castings that do not easily adhere to slag are preferable, but refractories are less expensive.

  As shown in FIG. 5, the several plate 38 is attached to the whole surface of the converter side surface with the volt | bolt 38a without the clearance gap. In addition, a peep hole 39 is provided in one of the plurality of plates 38. The peephole 39 also functions as a sampling window.

  Cutouts are formed at positions corresponding to each other inside the lower portions of the shutters 22. When the shutters 22 are closed, the cutouts are combined to form a sampling window 23. (See FIG. 2). The sampling window 23 is conventionally provided and is normally closed when sampling is not performed. However, in this embodiment, the sampling window 23 is opened and a frame that supports the protective wall 31 of the support base 32. Is positioned in the sampling window 23. For this reason, even if the converter waste protection member 30 is disposed, the opening and closing of the shutter 22 is not affected.

  As shown in FIG. 6, the crane mount 35 is attached to both sides of the support stand 32, spans a pair of support pillars 41 extending upward, and the upper part of the pair of support pillars 41, and engages the hook 36 of the overhead crane. And an engaging rod 42 to be mated. Each support column 41 is provided with a guide plate 43 for guiding the hook 36 to the central portion of the engagement rod 42.

  In the converter equipment configured as described above, the converter waste protection member 30 is disposed at a predetermined position, hot metal is charged into the converter 11, the shutter 21 is closed, and desiliconization blowing is performed. . After the desiliconization blowing, as shown in FIG. 1, since the desiliconization slag S exists on the hot metal L, the hot metal L is put in the converter 11 in preparation for the next dephosphorization blowing. The intermediate evacuation for evacuating the desiliconized slag S is performed while leaving

  At the time of intermediate evacuation, as shown in FIG. 7, the converter 11 is tilted to the front side of the furnace, and the desiliconized slag S is received in the pot 50.

  At this time, if the hot metal L is discharged while remaining in the converter 11, the hot metal is discharged at a shallower tilt angle than when the hot metal is discharged and discharged, so that the risk of slag scattering to the front side of the furnace increases. In this way, when the slag is scattered on the furnace front side, conventionally, there is a risk that the slag directly contacts the shutter and flows out from the gap between the shutters to the furnace front.

  On the other hand, in the present embodiment, the converter waste protection member 30 is installed, and the shutter 22 is disposed on the front side of the furnace where slag is scattered when the hot metal L is left in the converter 11 while being discharged. Since the protective wall 31 having a casting or a refractory on the surface is disposed so as to cover the gap, the discharged slag contacts the shutter 22 without performing a large-scale construction, and the shutter 22 It is possible to effectively prevent the slag from flowing out into the furnace front 20 through the gap.

  Thus, since the contact of the slag with the shutter 22 can be prevented, the shutter 22 can be used stably. In addition, when the converter waste protection member 30 is not used, it is necessary to frequently clean the furnace in order to remove the slag flowing out to the furnace front 20, but the converter waste protection member 30 is used. As a result, cleaning of the furnace front 20 is almost unnecessary.

  Furthermore, since the converter waste protection member 30 is detachable with an overhead crane, the slag contact portion can be repaired with the converter waste protection member 30 removed, and the slag contact portion is repaired. Is easy. Furthermore, since the protective wall 31 is formed by attaching a plurality of plates 38 made of cast or refractory to the surface of the base member 37 with bolts 38a, it is only necessary to remove and replace only the plate 38 in contact with the slag. .

  Furthermore, since the frame that supports the protective wall 31 of the support base 32 is positioned in the sampling window 23 that is formed when the shutter 22 is closed, the converter waste protection member 30 is a shutter. There is no effect on the opening and closing of 22.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above embodiment, the protective wall 31 is supported by the support base 32 to constitute the converter waste protection member 30. However, the present invention is not limited to this, and when the waste is left in the converter, the hot metal is left. Other configurations are not limited as long as a protective wall is provided on the front side of the furnace where the soot is scattered so as to cover the gap between the shutters provided on the front side of the converter.

  Moreover, in the said embodiment, although the example which performs the intermediate waste after desiliconizing and blowing in a converter was shown, it is not limited to this, and is applicable if it is exhausted while leaving the hot metal in the converter. Is possible.

DESCRIPTION OF SYMBOLS 1 Converter equipment 10 Converter arrangement part 11 Converter 20 In front of furnace 21 Work floor 22 Shutter 23 Sampling window 30 Protection member for converter discharge 31 Protective wall 32 Support stand 33 Weight attachment part 34 Weight 35 Crane stand 37 Base member 38 Plate 38a Bolt 41 Support column 42 Engagement rod 43 Guide plate 50 Pan L Hot metal S Desiliconized slag

Claims (7)

In the converter equipment, the surface part provided to cover the gap of the shutter provided on the furnace front side of the converter at the furnace front side part where the slag scatters when the hot metal remains in the converter There have a configured protective barrier by casting or refractory,
The protective wall is supported by a support base;
A sampling window is formed when the shutter is closed, and a frame that supports the protective wall of the support base is provided corresponding to the sampling window and does not hinder the opening and closing of the shutter. Protective member for furnace evacuation. Before Symbol support base, a converter exhaust slag for protection member according to claim 1, characterized in that provided on the work floor in front furnace. The protective member for converter waste according to claim 1 or 2 , further comprising a crane mount for hooking a hook of an overhead crane, and detachable by a crane. The said protective wall has the base member supported by the said support stand, and the some plate which consists of a casting or a refractory attached to the surface of the said base member so that attachment or detachment is possible. Item 4. The protective member for converter discharge according to any one of items 3 to 4 . After removal珪吹smelting in a converter furnace, prior to the dephosphorization blowing any one of claims 4 to desiliconization slag from claim 1, characterized in that used when the intermediate Haikasu A protective member for converter discharge as described in 1. Converter equipment comprising a converter and a furnace front provided with a shutter from the converter,
After the desiliconization blowing in the converter , the converter equipment covers the shutter on the front side of the furnace where the slag is scattered when the desiliconized slag is discharged before the dephosphorization blowing. And further comprising a protective member for converter evacuation having a protective wall whose surface portion is made of cast or refractory ,
The protective wall is supported by a support base;
A sampling window is formed when the shutter is closed, and a frame that supports the protective wall of the support base is provided corresponding to the sampling window and does not hinder the opening and closing of the shutter. Furnace equipment. In the converter equipment, after desiliconization blowing in the converter, prior to dephosphorization blowing, when desiliconizing slag is discharged intermediately,
The furnace front portion of the slag is scattered, the surface portion so as to cover the gap of the shutter provided in the furnace front of the converter is constituted by casting or refractory, it sets a supported protective barrier to the support,
A sampling window is formed when the shutter is closed, and a frame that supports the protective wall of the support base is provided corresponding to the sampling window so as not to prevent the opening and closing of the shutter. A converter refining method characterized by the above.

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