JP2019011487A - Stave for cooling furnace body of metallurgical furnace - Google Patents

Abstract

To provide a stave for cooling a furnace body of a metallurgical furnace that is a stave for cooling a furnace body used for cooling an iron shell of a furnace body of a metallurgical furnace (for instance, blast furnace), which reduces deformation of the stave caused by existence of a beam part and relaxes a stress generated on root parts of a cooling medium supply pipe (cooling water supply pipe) and a cooling medium discharge pipe (cooling water discharge pipe) to improve a service life of the stave.SOLUTION: A stave for cooling a furnace body of a metallurgical furnace that is a stave for cooling a furnace body used for cooling a furnace body of a metallurgical furnace includes a stave body which has a beam shape and corresponds to a stand of a beam, and a plurality of beam parts which correspond to teeth of the beam, project from the stave body and extend in a horizontal direction, where a width Wa of the beam part positioned at the upper end of the stave body and a width Wc of the beam part positioned at the lower end of the stave body are narrower than a width Wb of the beam part positioned at an intermediate part in a vertical direction of the stave body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a furnace body cooling stave used for cooling a furnace body of a metallurgical furnace (for example, a blast furnace).

  In a metallurgical furnace such as a blast furnace, a furnace cooling stave (hereinafter also simply referred to as “stave”) is provided inside the furnace body iron shell in order to protect the furnace body iron shell from high temperature gas or high temperature melt in the furnace. It is attached.

  FIG. 1 is a diagram illustrating a state in which a stave (furnace body cooling stave) 10 is installed in the blast furnace 1. As shown in FIG. 1, the stave 10 is installed inside the furnace core 3 in a state of being connected in the height direction of the shaft portion 2 of the blast furnace 1. In FIG. 1, the stave 10 is installed on the shaft portion 2 as an example, but the belly portion and the Bosch portion below the shaft portion 2 are the main installation locations of the stave 10.

  The stave 10 has a getter shape as described in Patent Document 1 (here, as shown in a side view in FIG. 2), corresponds to a getter base, and has a rectangular parallelepiped shape. A stave body 11 and a plurality (13 in this case) of getter portions 12 corresponding to the teeth of the getter and projecting from the stave body 11 and extending in the width direction (horizontal direction) of the stave body 11 are provided. The stave body 11 and the getter portion 12 are made of copper, alloy copper, or cast iron.

  The stave body 11 is provided with a cooling medium flow path (cooling water flow path) 22 that extends in the longitudinal direction (vertical direction) of the stave main body 11 and through which a cooling medium (for example, cooling water) flows. 11, a cooling medium supply pipe (cooling water supply pipe) 21 for supplying a cooling medium (cooling water) to the cooling medium flow path (cooling water flow path) 22, and a cooling medium (cooling water) as a cooling medium flow path (cooling water flow path). A cooling medium discharge pipe (cooling water discharge pipe) 23 for discharging from the (cooling water flow path) 22 is connected.

  Such a cooling medium supply pipe (cooling water supply pipe) 21, a cooling medium flow path (cooling water flow path) 22, and a cooling medium discharge pipe (cooling water discharge pipe) 23. ) With the flow of the cooling medium (cooling water) 20, the furnace core 3 is cooled while cooling the stave 10 itself, and the furnace core 3 is protected from the high-temperature gas or high-temperature melt in the furnace. ing.

  On the other hand, as shown in FIG. 2, a refractory 30 is held between the adjacent getter portions 12.

  In Patent Document 1, as shown in FIG. 2, the width of the getter portion located at the upper end of the stave body (hereinafter also referred to as “the top getter portion”) and the getter located at the lower end of the stave body. The width of the portion (hereinafter also referred to as “getter portion at the lower end”) is other getter portion (that is, the getter portion located at the intermediate portion in the vertical direction of the stave body (hereinafter also referred to as “getter portion at the intermediate portion”)) When the staves are connected in the vertical direction, it is possible to contact the stave adjacent to the top and bottom with rigidity.

  Here, the width of the getter portion is represented by the leading edge width of the getter portion.

Japanese Examined Patent Publication No. 63-56283

  However, the conventional stave has the following problems.

  That is, as shown in FIG. 2, in the cooling water piping system 20 (cooling water supply piping 21, cooling water flow path 22, cooling water discharge piping 23), cooling at the upper end and cooling at the lower end is cooled by cooling water. The upper getter portion and the lower getter portion are hotter than the intermediate getter portion and thermally expand, so that the stave 10 is greatly deformed and connected to the stave body 11. Since local stress occurs at the root of the cooling water supply pipe 21 and the cooling water discharge pipe 23 (connection portion with the stave body 11), and the fracture due to fatigue occurs at the welded portion of the pipe root, There was a problem that the service life of the stave was shortened.

  In particular, in the case of the stave 10X described in Patent Document 1, as shown in a side view in FIG. 11 and a partially enlarged view in the vertical direction in FIG. Since the width of the getter portion 12c is larger than the width of the intermediate getter portion 12b, the portion to be heated (the portion to be heated) 15 becomes very wide, and the above-described problem appears remarkably.

  The present invention has been made in view of the above circumstances, and in a furnace cooling stave used for cooling a furnace core of a metallurgical furnace (for example, a blast furnace), the stave caused by the presence of a getter portion is provided. Metallurgy that can improve the service life of the stave by reducing deformation and relieving stress generated at the root of cooling medium supply pipe (cooling water supply pipe) and cooling medium discharge pipe (cooling water discharge pipe) The object is to provide a furnace body cooling stave.

  In order to solve the above problems, the present invention has the following features.

[1] A furnace body cooling stave used for cooling a furnace body of a metallurgical furnace,
It has a getter shape and comprises a stave body corresponding to a getter base and a plurality of getter parts corresponding to getter teeth, protruding from the stave body and extending horizontally.
A cooling medium flow path extending in the vertical direction and through which the cooling medium flows is provided inside the stave body, and a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path to the stave body, and a cooling medium Is connected to the coolant discharge pipe for discharging the coolant from the coolant flow path,
The width Wa of the getter portion located at the upper end of the stave body and the width Wc of the getter portion located at the lower end of the stave body are narrower than the width Wb of the getter portion located in the vertical middle portion of the stave body. Stave for cooling the metallurgical furnace.

  [2] The metallurgical furnace furnace cooling stave according to [1], wherein 0.8 ≦ (Wa + Wc) /Wb≦1.2.

  [3] The metallurgical furnace furnace cooling stave according to [1] or [2], wherein Wa <Wc.

[4] A furnace body cooling stave used for cooling the furnace body of a metallurgical furnace,
It has a getter shape and comprises a stave body corresponding to a getter base and a plurality of getter parts corresponding to getter teeth, protruding from the stave body and extending horizontally.
A cooling medium flow path extending in the vertical direction and through which the cooling medium flows is provided inside the stave body, and a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path to the stave body, and a cooling medium Is connected to the coolant discharge pipe for discharging the coolant from the coolant flow path,
A stave for cooling a metallurgical furnace body, characterized in that no getter portion is arranged at the upper and lower ends of the stave body.

[5] A furnace body cooling stave used for cooling the furnace body of the metallurgical furnace,
It has a getter shape and comprises a stave body corresponding to a getter base and a plurality of getter parts corresponding to getter teeth, protruding from the stave body and extending horizontally.
A cooling medium flow path extending in the vertical direction and through which the cooling medium flows is provided inside the stave body, and a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path to the stave body, and a cooling medium Is connected to the coolant discharge pipe for discharging the coolant from the coolant flow path,
1. A metallurgical furnace furnace cooling stave in which no getter portion is disposed on either the upper end or the lower end of the stave body.

  According to the present invention, in a furnace body cooling stave used for cooling a furnace body core of a metallurgical furnace (for example, a blast furnace), deformation of the stave caused by the presence of a getter portion is reduced, and a cooling medium supply pipe (cooling water) The service life of the stave can be improved by relieving the stress generated at the root of the supply pipe) and the cooling medium discharge pipe (cooling water discharge pipe).

It is a figure which illustrates the state where the stave was installed in the blast furnace. It is a side view of the stave installed in the blast furnace. It is a side view which shows Embodiment 1 of this invention. It is the elements on larger scale in Embodiment 1 of this invention. It is a side view which shows Embodiment 2 of this invention. It is the elements on larger scale in Embodiment 2 of this invention. It is a side view which shows Embodiment 3 of this invention. It is the elements on larger scale in Embodiment 3 of this invention. It is a side view which shows Embodiment 4 of this invention. It is the elements on larger scale in Embodiment 4 of this invention. It is a side view which shows a prior art (patent document 1). It is the elements on larger scale in the prior art (patent document 1).

  Embodiments (Embodiments 1 to 4) of the metallurgical furnace furnace cooling stave of the present invention will be described with reference to the drawings (FIGS. 3 to 10). Here, a blast furnace will be described as an example of the metallurgical furnace.

  First, the basic structure of the furnace body cooling stave in the embodiment (Embodiments 1 to 4) of the present invention is the same as the stave 10 shown in FIGS. 1 and 2 described above. However, the refractory 30 is omitted in FIGS.

[Embodiment 1]
FIG. 3 shows a side view of the stave 10A in the first embodiment, and FIG. 4 shows a partially enlarged view when the stave 10A is connected in the vertical direction.

  As shown in FIGS. 3 and 4, in the stave 10 </ b> A according to the first embodiment, the width Wa of the getter portion 12 a located at the upper end of the stave body 11 and the width Wc of the getter portion 12 c located at the lower end of the stave body 11 are set. The width Wb of the getter portion 12b located at the middle portion in the vertical direction of the stave body 11 is narrower. That is, Wa <Wb and Wc <Wb.

  Accordingly, in the first embodiment, the high temperature target portion 15 is narrowed, and it is suppressed that the upper getter portion 12a and the lower getter portion 12c are heated higher than the intermediate getter portion 12b. Since the deformation is reduced and the stress generated at the roots of the cooling water supply pipe 21 and the cooling water discharge pipe 23 is alleviated, the service life of the stave 10A can be improved.

  As shown in FIG. 4, when the stave 10 </ b> A is connected in the vertical direction, the vertical getter portions 12 are arranged as follows: the intermediate getter portion 12 b (width Wb), and the lower getter portion. 12c (width Wc) + getter portion 12a (width Wa) at the upper end, getter portion 12b (width Wb) at the middle portion, and so on in this order, so that Wc + Wa≈Wb (for example, 0.8 ≦ (Wa + Wc) / Wb ≦ 1.2), the continuity (same width) of the getter portion 12 in the vertical direction can be ensured.

  The upper getter portion 12a close to the cooling water discharge pipe 23 is cooled because the temperature of the cooling water passing through the vicinity is higher than the lower getter portion 12c close to the cooling water supply pipe 21. For this reason, it is preferable to make the width Wa of the upper getter portion 12a narrower than the width Wc of the lower getter portion 12c (that is, Wa <Wc).

[Embodiment 2]
FIG. 5 shows a side view of the stave 10B according to the second embodiment, and FIG. 6 shows a partially enlarged view when the stave 10B is connected in the vertical direction.

  As shown in FIGS. 5 and 6, in the stave 10 </ b> B according to the second embodiment, the getter portions 12 are not arranged at the upper end and the lower end of the stave body 11.

  Thereby, in this Embodiment 2, the high temperature object part 15 becomes narrow, the deformation | transformation of a stave reduces, and the stress which generate | occur | produces in the root part of the cooling water supply piping 21 or the cooling water discharge piping 23 is relieve | moderated. The service life of the stave 10B can be improved.

[Embodiment 3]
FIG. 7 shows a side view of the stave 10C according to the third embodiment, and FIG. 8 shows a partially enlarged view when the stave 10C is connected in the vertical direction.

  As shown in FIGS. 7 and 8, in the stave 10 </ b> C according to the third embodiment, the getter portion 12 is not disposed at the upper end of the stave body 11.

  Thereby, in this Embodiment 3, the high temperature object part 15 becomes narrow, deformation | transformation of a stave is reduced, and the stress which generate | occur | produces in the root part of the cooling water supply piping 21 or the cooling water discharge piping 23 is relieve | moderated. The service life of the stave 10B can be improved.

  As shown in FIG. 8, when the staves 10 </ b> C are connected in the vertical direction, the vertical getter portions 12 are arranged as follows: the intermediate getter portion 12 b (width Wb), and the lower getter portion. 12c (width Wc), intermediate getter portion 12b (width Wb),... In this order, so if Wc≈Wb (for example, 0.8 ≦ Wc / Wb ≦ 1.2), the vertical direction The continuity (same width) of the getter portion 12 can be ensured.

[Embodiment 4]
FIG. 9 shows a side view of the stave 10D in the fourth embodiment, and FIG. 10 shows a partially enlarged view when the stave 10D is connected in the vertical direction.

  As shown in FIGS. 9 and 10, in the stave 10 </ b> D according to the fourth embodiment, the getter portion 12 is not disposed at the lower end of the stave body 11.

  Thereby, in this Embodiment 4, the high temperature object part 15 becomes narrow, the deformation | transformation of a stave reduces, and the stress which generate | occur | produces in the root part of the cooling water supply piping 21 or the cooling water discharge piping 23 is relieve | moderated. The service life of the stave 10D can be improved.

  As shown in FIG. 10, when the staves 10D are connected in the vertical direction, the vertical getter portions 12 are arranged as follows: the middle getter portion 12b (width Wb), and the upper getter portion. 12a (width Wa), intermediate getter portion 12b (width Wb),... In this order, so if Wa≈Wb (for example, 0.8 ≦ Wa / Wb ≦ 1.2), the vertical direction The continuity (same width) of the getter portion 12 can be ensured.

  Furthermore, since the stave 10A to the stave 10D in the first to fourth embodiments are reduced in weight, it is possible to reduce the manufacturing cost.

  In addition, the stave 10A to the stave 10D in the first to fourth embodiments have the same basic shape and dimensions as those of a normal stave, and only the top getter portion 12a and the bottom getter portion 12c are changed. Therefore, it is possible to apply even one replacement update arranged in the circumferential direction without changing the operating conditions (heat input, furnace inner diameter) of the blast furnace at the time of partial replacement of a normal stave. .

  3, 5, 7, and 9, the width of the getter portion 12 (12 a, 12 b, 12 c) is uniform from the forefront to the end of the getter portion. 6, 8, and 10, the width of the getter portion 12 (12 a, 12 b, 12 c) is uniform from the forefront to the end of the getter portion, but here, FIG. 4, FIG. 6, FIG. In FIG. 10, the width of the getter portion 12 is gradually narrowed from the foremost end toward the rear end. By using such a shape, the refractory 30 between the getter portions 12 is difficult to fall. It is shown that there is a case to become.

  Although the blast furnace is described here as an example, the present invention can be similarly applied to other metallurgical furnaces (for example, scrap melting furnaces).

DESCRIPTION OF SYMBOLS 1 Blast furnace 2 Shaft part 3 Furnace iron skin 10 Stave (Stave for furnace body cooling)
10A Stave 10B Stave 10C Stave 10D Stave 10X Stave 11 Stave Main Body 12 Getter 12a Top Getter 12b Middle Getter 12c Bottom Getter 20 Cooling Water Piping System 21 Cooling Water Supply Piping 22 Cooling Water Discharge 23 Cooling Water Discharge 23 Piping 30 Refractory

Claims (5)

A furnace body cooling stave used for cooling a furnace body of a metallurgical furnace,
It has a getter shape and comprises a stave body corresponding to a getter base and a plurality of getter parts corresponding to getter teeth, protruding from the stave body and extending horizontally.
A cooling medium flow path extending in the vertical direction and through which the cooling medium flows is provided inside the stave body, and a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path to the stave body, and a cooling medium Is connected to the coolant discharge pipe for discharging the coolant from the coolant flow path,
The width Wa of the getter portion located at the upper end of the stave body and the width Wc of the getter portion located at the lower end of the stave body are narrower than the width Wb of the getter portion located in the vertical middle portion of the stave body. Stave for cooling the metallurgical furnace.   The metallurgical furnace furnace cooling stave according to claim 1, wherein 0.8 ≦ (Wa + Wc) /Wb≦1.2.   3. The metallurgical furnace furnace cooling stave according to claim 1, wherein Wa <Wc. A furnace body cooling stave used for cooling a furnace body of a metallurgical furnace,
It has a getter shape and comprises a stave body corresponding to a getter base and a plurality of getter parts corresponding to getter teeth, protruding from the stave body and extending horizontally.
A cooling medium flow path extending in the vertical direction and through which the cooling medium flows is provided inside the stave body, and a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path to the stave body, and a cooling medium Is connected to the coolant discharge pipe for discharging the coolant from the coolant flow path,
A stave for cooling a metallurgical furnace body, characterized in that no getter portion is arranged at the upper and lower ends of the stave body. A furnace body cooling stave used for cooling a furnace body of a metallurgical furnace,
It has a getter shape and comprises a stave body corresponding to a getter base and a plurality of getter parts corresponding to getter teeth, protruding from the stave body and extending horizontally.
A cooling medium flow path extending in the vertical direction and through which the cooling medium flows is provided inside the stave body, and a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path to the stave body, and a cooling medium Is connected to the coolant discharge pipe for discharging the coolant from the coolant flow path,
1. A metallurgical furnace furnace cooling stave in which no getter portion is disposed on either the upper end or the lower end of the stave body.