JP5477234B2 - Molten metal transfer rod - Google Patents

Description

  The present invention relates to a molten metal transfer rod for transferring molten metal such as hot metal produced from, for example, a blast furnace.

Conventionally, as a molten metal transfer rod for transferring molten iron produced from a blast furnace, for example, as shown in Patent Document 1, a rod main body is disposed inside a housing groove portion in which bricks are lining (lining bricks) on the inner surface. And the thing of the structure filled with the irregular refractory material (castable material) between this fence main body and the lining brick is proposed.
Patent Document 2 discloses a technique in which a thermal shock is mitigated by interposing a ceramic fiber layer inside the refractory layer in order to suppress the occurrence of cracks in the refractory layer made of an irregular refractory material. Has been.

JP 61-153219 A JP 2001-021271 A

  By the way, in patent document 1, in the thing which filled between the cocoon main body and the lining brick with the irregular refractory material, when it is going to replace the cocoon main body, it is necessary to destroy the filled irregular refractory material When destroying the filled amorphous refractory material, there was a risk of damaging the main body or lining brick. For this reason, much time and labor were required for the replacement work of the bag body. Furthermore, since it was necessary to dry the amorphous refractory material sufficiently when constructing the molten metal transfer rod, a lot of time was required for the construction.

  Furthermore, in the molten metal transfer rod described in Patent Document 1, since the space between the rod body and the lining brick is filled with an irregular refractory material, deformation of the rod body and the lining brick is suppressed. As a result, when the temperature of the cocoon main body, the lining brick, etc. rises and thermally expands, there is a problem that the cocoon main body or the lining brick easily cracks due to thermal strain.

In addition, as in Patent Document 2, when a ceramic fiber layer is applied to a refractory layer made of an irregular refractory material, a long time is required for the construction to sufficiently dry the irregular refractory material. .
As described above, the conventional molten metal transfer rod has a problem that even if a portion of the rod is damaged or deteriorated, it cannot be easily repaired.

  The present invention has been made in view of the above-described situation, and even if a part of the molten metal transfer rod is damaged or deteriorated, it is possible to perform replacement, repair, and construction at an early stage. An object of the present invention is to provide a molten metal transfer rod that is capable of suppressing the occurrence of cracks due to thermal distortion in a member constituting the molten metal transfer rod.

In order to solve the above-mentioned problems, a molten metal transfer rod according to the present invention is a molten metal transfer rod for transferring a molten metal, and a rod main body provided with a runner through which the molten metal flows, A housing groove portion in which the main body is housed, and a gap is formed between the inner surface of the groove side wall of the housing groove portion and the flange main body, and at least a part of the inner surface of the groove side wall of the housing groove portion Is provided with a heat insulating layer, and the heat insulating layer has a structure in which a plurality of panel members are arranged in parallel. The panel member has a thermal conductivity of 0.03 W / (m · K) or less. The low heat conductive layer and a support layer that supports the low heat conductive layer are provided, and the low heat conductive layer and the support layer are filled in a container .

The molten metal transfer rod having this configuration has a rod main body provided with a runner through which the molten metal flows, and a storage groove portion in which the rod main body is accommodated, and an inner surface of the groove side wall of the accommodation groove portion and the rod body Since the gap is formed between the main body and the main body, the main body can be easily removed from the housing groove, and the replacement of the main body can be easily performed. Moreover, in the replacement | exchange operation | work of a cocoon main body, since an unshaped refractory is not constructed, it becomes possible to implement the replacement | exchange operation | work of a cocoon main body in a short time. Therefore, when a part of the dredged main body deteriorates, it is possible to use the molten metal transfer dredging at an early stage by replacing it with another dredging main body, and there is no need to stop the operation of the blast furnace or the like for a long time. .
Further, in the molten metal transfer rod according to the present invention, since the gap is formed between the groove side wall inner surface of the housing groove and the rod body, the groove wall and the groove sidewall of the housing groove are at a high temperature. Even in the case of thermal expansion, the groove main body and the groove side wall of the housing groove can be deformed relatively freely in the gap, and the occurrence of cracks in the groove side wall of the bag main body and the housing groove can be suppressed. .

Here, since the heat insulating layer is disposed on at least a part of the inner surface of the groove side wall of the housing groove, the heat insulating layer disposed on a part of the inner surface of the groove side wall prevents the housing groove from deteriorating early. it can.

Also, a heat insulating layer disposed on at least a part of the groove side wall inner surface of the groove yield capacity is likely to deteriorate by the heat from the molten metal flowing within the gutter body. In the present invention, since the heat insulating layer has a structure in which a plurality of panel materials are arranged in parallel, it is possible to repair the heat insulating layer by replacing only the panel member of the deteriorated part, and the repair work can be easily performed in a short time. It becomes possible to carry out.

Also, the panel member constituting the sectional heat layer comprises a low thermal conductivity layer thermal conductivity is a 0.03W / (m · K) or less, and a support layer for supporting the low thermal conductivity layer, the Therefore, the panel member itself can be formed thin while maintaining the heat insulation performance, the handleability of the panel member can be improved, and the replacement operation of the panel member can be performed more easily. Moreover, since it becomes possible to form a heat insulation layer thinly, the above-mentioned space | gap part can be formed even if the width | variety of a collar main body is enlarged. Therefore, it is possible to promote the circulation of the molten metal by increasing the width of the main body and increasing the cross-sectional area of the runner.

Furthermore, it is preferable that the panel member is disposed at the groove bottom of the housing groove.
In this case, it is possible to repair the bottom of the groove by replacing the panel member of the deteriorated part by disposing the panel member at the bottom of the housing groove, and easily perform the repair work in a short time. Is possible.

Moreover, it is preferable that the said main body is equipped with the iron frame, and the cooling flow path through which the cooling medium distribute | circulates is provided in this iron frame.
Since a gap is formed between the bag main body and the housing groove, the temperature rises in the gap due to heat from the bag main body. Therefore, by providing a cooling channel through which the cooling medium flows in the iron frame portion of the main body, it is possible to suppress an increase in the temperature of the gap.

  As described above, according to the present invention, even if a part of the molten metal transfer rod is damaged or deteriorated, it is possible to perform replacement, repair, and construction at an early stage, and It is possible to provide a molten metal transfer rod that can suppress the occurrence of cracks due to thermal strain in the members constituting the molten metal transfer rod.

It is a schematic explanatory drawing of the molten metal transfer rod which is one Embodiment of this invention. It is explanatory drawing (XX sectional arrow view in FIG. 1) of the heat insulation layer formed in the groove | channel side wall of the accommodation groove part of the molten metal transfer rod shown in FIG. It is explanatory drawing which shows the attachment state of the panel member which comprises a heat insulation layer. It is explanatory drawing of the panel member which comprises the heat insulation layer shown in FIG. It is an expanded sectional explanatory view of the panel member shown in FIG. It is explanatory drawing of the manufacturing method of the panel member shown in FIG. It is a schematic explanatory drawing of the molten metal transfer rod which is other embodiment of this invention. It is a schematic explanatory drawing of the molten metal transfer rod which is other embodiment of this invention.

Hereinafter, a molten metal transfer rod which is an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited to the following embodiment.
The molten metal transfer iron 10 according to the present embodiment is for transferring hot metal (pig iron) produced from a blast furnace.

The molten metal transfer bar 10 includes a bar body 20 having a runner 21 through which hot metal flows, a storage groove 30 in which the bar body 20 is stored, and a lid 12 disposed above the bar body 20. It is equipped with.
Here, in the present embodiment, a plurality of cocoon main bodies 20 are prepared, and the heel main body 20 is replaced at regular intervals.

The main body 20 includes an iron frame body 23 and a runner member 22 made of an irregular refractory material formed on the iron frame body 23.
The iron frame 23 has a double structure, and a cooling flow path 24 through which a cooling medium flows is formed. In the present embodiment, air is configured to flow through the iron frame 23 as a cooling medium.

  As shown in FIG. 1, the lid portion 12 is configured to seal the upper opening portion of the runner 21 formed in the tub body 20. The lid portion 12 is provided with a suction duct 13, one end of the suction duct 13 is opened in the upper space of the runner 21, and the other end is connected to a suction portion (not shown). The lid portion 12 is used when circulating hot metal or the like through the runner 21, and removes dust or the like generated above the runner 21 through the suction duct 13. It suppresses the temperature drop of the hot metal flowing through.

The housing groove 30 includes a concrete groove main body 31 and a side wall brick layer 32 disposed above the side wall of the groove main body 31.
The groove bottom portion of the groove body 31 is formed by precasting a base portion 33 made of an irregular refractory, a bottom heat insulating portion 34 made of red bricks stacked above the base portion 33, and an amorphous refractory. A pedestal portion 35 is disposed.

  A heat insulating layer 38 is disposed on the inner surface of the groove side wall of the groove main body 31. In the present embodiment, as shown in FIGS. 2 and 3, the plurality of panel members 40 are arranged so as to be arranged in parallel in the extending direction of the groove body 31, whereby the above-described heat insulating layer 38 is defined. It has been done. Here, as shown in FIG. 3, the plurality of panel members 40 are formed into grooves by the pressing members 52 when the fixing bolts 51 connected to the pressing members 52 are screwed into the groove side walls of the concrete groove body 31. It is pressed against the inner surface of the groove side wall of the main body 31 and fixed.

Next, the panel member 40 which comprises the heat insulation layer 38 is demonstrated.
As shown in FIG. 4, the panel member 40 has a substantially rectangular flat plate shape. Further, a suspension member 42 is provided on one side surface (upper side surface in FIG. 4) of the panel member 40. And the thickness t of the whole panel member 40 is set in the range of t <= 60mm.

  Further, as shown in FIG. 5, the panel member 40 includes a low thermal conductive layer 43 having a thermal conductivity at 200 ° C. of 0.03 W / (m · K) or less, and a support laminated on the low thermal conductive layer 43. A layer 44 and an iron container 41 that accommodates the low thermal conductive layer 43 and the support layer 44 are provided.

  In the present embodiment, the thermal conductivity of the low thermal conductive layer 43 at 200 ° C. is set within a range of 0.021 W / (m · K) to 0.03 W / (m · K). Specifically, a heat insulating material made of a fumed silica molded body (for example, WDS manufactured by Kurosaki Harima Co., Ltd.) is used as the low thermal conductive layer 43, and the thermal conductivity at 200 ° C. is 0.021 W / ( m · K). That is, the thermal conductivity at 200 ° C. of the low thermal conductive layer 43 is about 1/30 of the thermal conductivity 0.6 W / (m · K) at 200 ° C. of the general-purpose red brick. Therefore, this low heat conductive layer 43 is 1/30 the thickness of red brick and has the same heat insulating property as red brick.

Here, since the heat insulating material constituting the above-described low heat conductive layer 43 has low mechanical strength, in this embodiment, the low heat conductive layer 43 is supported by the support layer 44.
The support layer 44 is made of a material having a mechanical strength higher than that of the low thermal conductive layer 43, and in this embodiment, is made of an amorphous refractory material. As the amorphous refractory material, a general refractory material composed of an oxide such as Al ₂ O ₃ , SiO ₂ , MgO, CaO, or ZrO ₂ or a carbide such as SiC is selected. As a construction form, casting, stamping, patching, or the like is selected.

In the present embodiment, as shown in FIG. 5, the thickness th of the low thermal conductive layer 43 is set within the range of th ≦ 10 mm, and the thickness ts of the support layer 44 is set within the range of ts ≦ 50 mm. ing.
The low heat conductive layer 43 and the support layer 44 are entirely covered with an iron container 41, and the deterioration due to hot metal or the like is suppressed by the container 41.
In the heat insulating layer 38, the panel member 40 described above is arranged so that the surface on the low thermal conductive layer 43 side faces the groove side wall side of the groove main body 31, and the surface on the support layer 44 side faces the heel main body 20 side. Will be.

Next, the manufacturing method of this panel member 40 is demonstrated using FIG.
First, a container body 41A having an upper surface opened is prepared. A plurality of anchors 41B are erected on the inner side of the bottom surface of the container body 41A.
A support layer 44 is formed by pouring an amorphous refractory material into the container body 41A and drying it. Note that a plurality of gas vent holes (not shown) are formed in the bottom surface of the container main body 41A so as to promote drying of the irregular refractory material.
On the support layer 44, mortar is applied and a heat insulating material to be the low heat conductive layer 43 is placed. Then, the iron lid 41C is placed from above the low thermal conductive layer 43, and the iron lid 41C and the container body 41A are welded all around.
Thereby, the above-mentioned panel member 40 is comprised.

Next, the usage method of the molten metal transfer rod 10 which is this embodiment is demonstrated.
First, as shown in FIG. 1, the scissors main body 20 is placed and fixed on a pedestal portion 35 provided at the groove bottom of the housing groove 30.
At this time, a gap 60 is defined between the groove side wall inner surface (the surface of the heat insulating layer 38) of the housing groove 30 and the bag main body 20. Here, the gap 60 is an air atmosphere.
In the present embodiment, the width of the gap 60, that is, the minimum distance L between the groove side wall inner surface (the surface of the heat insulating layer 38) of the housing groove 30 and the bag main body 20 is set within a range of L ≧ 130 mm. Yes.

  Thus, the hot metal produced in the blast furnace flows through the runway 21 of the main body 20 in a state where the main body 20 is installed in the housing groove 30 and the lid 12 is disposed in the upper opening of the main body 20. Will do. And when the use period of the dredging main body 20 becomes a fixed period or more, the dredging main body 20 is taken out from the accommodation groove 30 and a new dredging main body 20 is installed in the accommodation groove 30 to transfer the hot metal from the blast furnace. continue. And the maintenance operation | work will be implemented by the main body 20 after a use offline.

  According to the molten metal transfer rod 10 of the present embodiment configured as described above, the rod main body 20 provided with the runway 21 for circulating the molten iron, and the accommodation groove portion 30 in which the rod main body 20 is accommodated. , And a gap 60 is formed between the inner surface of the groove side wall (the surface of the heat insulating layer 38) of the housing groove 30 and the bag body 20, so that the bag body 20 is placed in the container groove 30. Can be easily removed, and the replacement work of the bag main body 20 can be easily performed. In addition, since the irregular refractory is not constructed in the replacement work of the heel body 20, the replacement work of the heel body 20 can be performed in a short time. Therefore, when the rod main body 20 is deteriorated, the molten metal transfer rod 10 can be used at an early stage by exchanging with the other rod main body 20.

  Further, since the gap 60 is formed between the inner surface of the groove side wall (the surface of the heat insulating layer 38) of the housing groove 30 and the heel body 20, the groove side walls of the heel body 20 and the housing groove 30 are at a high temperature. Even when the thermal expansion occurs, the bag main body 20 and the groove side wall of the receiving groove part 30 do not contact each other, and can be deformed relatively freely in the gap 60. It is possible to suppress the occurrence of cracks in the groove side walls of the accommodation groove 30.

  In the present embodiment, the width L of the gap 60, that is, the minimum distance L between the groove side wall inner surface (the surface of the heat insulating layer 38) of the housing groove 30 and the bag main body 20 is set to L ≧ 130 mm. During the replacement operation of the bag main body 20 to the storage groove portion 30, there is less risk of interference with the groove side wall of the storage groove portion 30, and the replacement operation can be performed smoothly and quickly. Moreover, even when it thermally expands, the groove side wall of the accommodation groove part 30 and the bag main body 20 do not contact, and generation | occurrence | production of a crack etc. can be suppressed reliably.

In addition, since the heat insulating layer 38 formed on the inner surface of the groove side wall of the housing groove portion 30 has a structure in which a plurality of panel members 40 are arranged in parallel, when a part of the heat insulating layer 38 deteriorates, The repair work of the heat insulation layer 38 is completed only by exchanging the panel member 40. Therefore, the accommodation groove part 30 can be repaired in a short time.
In particular, in the present embodiment, the plurality of panel members 40 are fixed by the pressing member 52, and the suspension member 51 is disposed on the upper side surface of the panel member 40. The replacement work can be easily performed.

  In addition, the panel member 40 includes a low thermal conductive layer 43 having a thermal conductivity at 200 ° C. of 0.03 W / (m · K) or less, and a support layer 44 that supports the low thermal conductive layer 43. Since the conductive layer 43 and the support layer 44 are filled in the container 41, the panel member 40 itself can be formed thin, the handleability of the panel member 40 is improved, and the panel member 40 is replaced. Work can be performed more easily. In addition, since the necessary heat insulating property can be ensured even if the heat insulating layer 38 is formed thin, the gap 60 can be reliably formed between the bag main body 20 and the groove side wall of the housing groove 30. Moreover, even if the width | variety of the hot metal main body 20 is made wider than before, since the above-mentioned space | gap part 60 can be ensured, the cross-sectional area of the runway 21 of the hot metal main body 20 is enlarged, and the circulation of hot metal is promoted. It is also possible.

In particular, in this embodiment, a heat insulating material (for example, WDS manufactured by Kurosaki Harima Co., Ltd.) made of fumed silica is used as the low thermal conductive layer 43, and its thermal conductivity at 200 ° C. is 0.021 W. / (M · K), so that even if the panel member 40 is formed thin (in this embodiment, the thickness t = 60 mm of the panel portion), heat insulation equivalent to that of a red brick having a thickness of 220 mm is ensured. It is possible to prevent deterioration of the groove body 31 made of concrete.
In addition, since the support layer 44 that supports the low heat conductive layer 43 is provided, even if the mechanical strength of the low heat conductive layer 43 is low, the heat insulating layer 38 is configured as the panel portion 40 as in the present embodiment. It becomes possible to do.
Furthermore, in the present embodiment, since the low thermal conductive layer 43 and the support layer 44 are covered with the iron container 41, the iron container 41 suppresses wear due to hot metal, etc. Early deterioration will be prevented.

  Further, in the present embodiment, an amorphous refractory is poured into the container body 41A and dried to form a support layer 44, and a heat insulating material constituting the low thermal conductive layer 43 is disposed on the support layer 44. Since the above-mentioned panel member 40 is manufactured by arranging the iron lid 41C on the low heat conductive layer 43 and welding the entire circumference of the container body 41A and the iron lid 41C, the mechanical strength is high. It becomes possible to produce the panel member 40 having the low thermal conductive layer 43 relatively easily by using a heat insulating material that is difficult to handle.

  In addition, the cage main body 20 includes an iron frame body 23, and the iron frame body 23 is provided with a cooling channel 24 through which a cooling medium flows. It is possible to suppress the temperature rise of the gap portion 60 and to suppress the early deterioration of the heat insulating layer 38.

As mentioned above, although the molten metal transfer rod which is embodiment of this invention was demonstrated, this invention is not limited to this, In the range which does not deviate from the technical idea of the invention, it can change suitably.
For example, although the heat insulating layer has been described with a panel member having a low thermal conductive layer, the heat insulating layer 138 is not limited to this, and as shown in FIG. The space 160 may be formed between the surface of the heat insulating layer 138 and the bag main body 20. However, when the heat insulation layer 138 is formed of red brick, the thickness of the heat insulation layer 138 is thicker than that of the panel member provided with the above-described low heat conductive layer, so that the gap 160 is secured between the main body 20 and the wall. In order to do so, it is necessary to widen the groove width of the housing groove portion 130 or to narrow the width of the bag main body 20. When the width of the main body 20 is narrowed, the cross-sectional area of the runner 21 becomes small, and it becomes difficult to distribute the molten metal efficiently. Therefore, as in the present embodiment, it is preferable to configure the heat insulating layer with a panel member provided with a low thermal conductive layer.

  Moreover, although the above-mentioned panel member was demonstrated as what was arrange | positioned in the groove | channel side wall of the accommodation groove part, it is not limited to this, As shown in FIG. 240 may be provided to constitute the bottom heat insulating portion 234. In this case, the thickness of the bottom heat insulating portion 234 provided on the bottom surface portion of the housing groove portion 230 can be reduced, and the height of the bag main body 20 can be made higher than before. Therefore, the cross-sectional area of the runner 21 of the main body 20 can be increased, and the molten metal can be distributed efficiently. Moreover, the repair work of a bottom face part can be performed by replacing the panel member 240 of the part which deteriorated in the bottom face part. Therefore, the time and labor required for repair work can be greatly reduced.

  Further, the configuration of the bag main body is not limited to this embodiment, and may be a bag main body having another structure. For example, the iron frame may not have a double structure, and the internal runner may be formed of a fixed refractory material.

DESCRIPTION OF SYMBOLS 10 Molten metal transfer gutter 20 Cage main body 21 Runway 24 Cooling flow path 30 Housing groove part 38 Heat insulation layer 40 Panel member 41 Container 43 Low heat conductive layer 44 Support layer 60 Cavity part

Claims (3)

A molten metal transfer rod for transferring molten metal,
A main body provided with a runner through which the molten metal circulates, and an accommodation groove part in which the main body is accommodated,
A gap is formed between the inner surface of the groove side wall of the housing groove and the bag main body ,
A heat insulating layer is disposed on at least a part of the groove side wall inner surface of the housing groove portion, and the heat insulating layer has a structure in which a plurality of panel members are arranged in parallel.
The panel member includes a low thermal conductive layer having a thermal conductivity of 0.03 W / (m · K) or less and a support layer that supports the low thermal conductive layer, and the low thermal conductive layer and the support layer are containers. A transfer rod for molten metal, characterized by having a structure filled therein . The molten metal transfer rod according to claim 1 , wherein the panel member is disposed at a groove bottom of the housing groove. The melting body according to claim 1 or 2, wherein the main body includes an iron frame, and the iron frame is provided with a cooling channel through which a cooling medium flows. Metal transfer rod.

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