JP6658684B2 - Metallurgical furnace furnace cooling stave - Google Patents

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 metallurgical furnaces such as blast furnaces, a stove for cooling the furnace (hereinafter simply referred to as "stave") is placed inside the furnace shell to protect the furnace shell from high-temperature gas or high-temperature molten material in the furnace. Installed.

  FIG. 1 is a view 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 staves 10 are installed inside the furnace shell 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 a belly portion or a Bosch portion below the shaft portion 2 is a main installation portion of the stave 10.

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

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

  Such a cooling medium piping system (cooling water piping system) including 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. The flow of the cooling medium (cooling water) by 20 cools the furnace shell 3 while cooling the stave 10 itself, thereby protecting the furnace shell 3 from high-temperature gas or high-temperature molten material in the furnace. ing.

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

  In Patent Document 1, as shown in FIG. 2, the width of a getter portion located at the upper end of the stave body (hereinafter, also referred to as “upper getter portion”) and the getter portion located at the lower end of the stave body are described. The width of the portion (hereinafter also referred to as “lower getter portion”) is the other getter portion (that is, the getter portion located at the vertical middle portion of the stave body (hereinafter also referred to as “middle getter portion”)) When the staves are connected in the up-down direction, the staves can be in rigid contact with the staves adjacent vertically.

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

JP-B-63-56283

  However, the conventional stave has the following problems.

  That is, as shown in FIG. 2, in the cooling water piping system 20 (the cooling water supply piping 21, the cooling water flow path 22, and the cooling water discharge piping 23), cooling by cooling water is performed at the upper getter and the lower getter. The upper and lower getters become hotter than the middle getter and thermally expand, causing the stave 10 to be greatly deformed and connected to the stave body 11. Since local stress is generated at the root of the cooling water supply pipe 21 and the cooling water discharge pipe 23 (connection part with the stave body 11), and the weld at the root of the pipe is broken due to fatigue, There was a problem that the service life of the stave was shortened.

  Particularly, in the case of the stave 10X described in Patent Document 1, as shown in FIG. 11, a side view is shown, and FIG. Since the width of the getter portion 12c is larger than the width of the middle getter portion 12b, the portion 15 to be heated (the portion to be heated) becomes very wide, and the above-described problem becomes conspicuous.

  The present invention has been made in view of the above circumstances, and in a furnace body cooling stave used for cooling a furnace body shell of a metallurgical furnace (for example, a blast furnace), the stave of the stave caused by the presence of the getter portion is provided. Metallurgy that can reduce the deformation and reduce the stress generated at the base of the cooling medium supply pipe (cooling water supply pipe) and cooling medium discharge pipe (cooling water discharge pipe), thereby improving the service life of the stave. It is an object of the present invention to provide a furnace furnace 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 has a stave body corresponding to a getter base, and a plurality of getter portions corresponding to teeth of the getter and protruding from the stave body and extending in the horizontal direction,
A cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; And a cooling medium discharge pipe for discharging the cooling medium from the cooling medium 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 smaller than the width Wb of the getter portion located at the middle in the vertical direction of the stave body. A 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 a furnace body of a metallurgical furnace,
It has a getter shape, and has a stave body corresponding to a getter base, and a plurality of getter portions corresponding to teeth of the getter and protruding from the stave body and extending in the horizontal direction,
A cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; And a cooling medium discharge pipe for discharging the cooling medium from the cooling medium flow path,
A stave for cooling a metallurgical furnace body, wherein a getter portion is not arranged at an upper end and a lower end of a stave body.

[5] A furnace body cooling stave used for cooling a furnace body of a metallurgical furnace,
It has a getter shape, and has a stave body corresponding to a getter base, and a plurality of getter portions corresponding to teeth of the getter and protruding from the stave body and extending in the horizontal direction,
A cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; And a cooling medium discharge pipe for discharging the cooling medium from the cooling medium flow path,
A stave for cooling a metallurgical furnace body, wherein a getter portion is not disposed at one of an upper end and a lower end of a stave body.

  According to the present invention, in a furnace body cooling stave used for cooling a furnace body shell of a metallurgical furnace (for example, a blast furnace), deformation of the stave caused by the presence of the getter portion is reduced, and a cooling medium supply pipe (cooling water supply pipe) is provided. The service life of the stave can be improved by reducing the stress generated at the base 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 showing Embodiment 1 of the present invention. FIG. 2 is a partially enlarged view in Embodiment 1 of the present invention. It is a side view showing Embodiment 2 of the present invention. It is the elements on larger scale in Embodiment 2 of the present invention. It is a side view showing Embodiment 3 of the present invention. It is a partial enlarged view in Embodiment 3 of the present invention. It is a side view which shows Embodiment 4 of this invention. It is the elements on larger scale in Embodiment 4 of the present 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 a metallurgical furnace furnace cooling stave of the present invention will be described based on the drawings (FIGS. 3 to 10). Here, a blast furnace will be described as an example of the metallurgical furnace.

  First, the basic configuration 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, in FIGS. 3 to 10, the refractory 30 is omitted.

[Embodiment 1]
FIG. 3 is a side view of the stave 10A according to the first embodiment, and FIG. 4 is a partially enlarged view of the stave 10A when the staves 10A are vertically connected.

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

  Thus, in the first embodiment, the target portion 15 to be heated is narrowed, and the upper getter portion 12a and the lower getter portion 12c are suppressed from becoming higher in temperature than the middle getter portion 12b. Since the deformation is reduced and the stress generated at the base of the cooling water supply pipe 21 and the cooling water discharge pipe 23 is reduced, the service life of the stave 10A can be improved.

  Then, as shown in FIG. 4, when the staves 10A are connected in the vertical direction, the arrangement of the vertical getters 12 is..., The intermediate getter 12b (width Wb), and the lower getter 12b. 12c (width Wc) + top upper getter portion 12a (width Wa), middle getter portion 12b (width Wb),..., So that Wc + Wa ≒ Wb (for example, 0.8 ≦ (Wa + Wc) / Wb) If ≦ 1.2), continuity (same width) of the getter portion 12 in the vertical direction can be ensured.

  Further, the upper getter portion 12a near the cooling water discharge pipe 23 has a higher temperature of the cooling water passing therethrough than the lower getter portion 12c near the cooling water supply pipe 21, so that the cooling is performed. It is preferable that the width Wa of the upper getter portion 12a be smaller than the width Wc of the lower getter portion 12c (that is, Wa <Wc).

[Embodiment 2]
FIG. 5 is a side view of the stave 10B according to the second embodiment, and FIG. 6 is a partially enlarged view of the stave 10B when the staves 10B are vertically connected.

  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 the second embodiment, the high temperature target portion 15 is narrowed, the deformation of the stave is reduced, and the stress generated at the base of the cooling water supply pipe 21 and the cooling water discharge pipe 23 is reduced. Thus, 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 staves 10C are connected in the up-down 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 arranged at the upper end of the stave body 11.

  Thus, in the third embodiment, the portion 15 to be heated is narrowed, the deformation of the stave is reduced, and the stress generated at the roots of the cooling water supply pipe 21 and the cooling water discharge pipe 23 is reduced. Thus, the service life of the stave 10B can be improved.

  Then, as shown in FIG. 8, when the staves 10C are connected in the up-down direction, the arrangement of the getter portions 12 in the up-down direction is..., The middle getter portion 12b (width Wb), and the lower getter portion. 12c (width Wc), the middle getter portion 12b (width Wb),..., So that 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 is a side view of the stave 10D according to the fourth embodiment, and FIG. 10 is a partially enlarged view of the stave 10D when the staves 10D are vertically connected.

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

  Thereby, in the fourth embodiment, the high temperature target portion 15 is narrowed, the deformation of the stave is reduced, and the stress generated at the base of the cooling water supply pipe 21 and the cooling water discharge pipe 23 is reduced. Thus, the service life of the stave 10D can be improved.

  Then, as shown in FIG. 10, when the staves 10D are connected in the vertical direction, the arrangement of the vertical getters 12 is..., The intermediate getter 12b (width Wb), and the upper getter. 12a (width Wa), the middle getter portion 12b (width Wb),..., So that 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 staves 10A to 10D in the first to fourth embodiments are reduced in weight, manufacturing costs can be reduced.

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

  3, 5, 7, and 9, the width of the getter portion 12 (12 a, 12 b, 12 c) is uniform from the most extreme to the last 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 front end to the last 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 front end to the rear end. This configuration makes it difficult for the refractory 30 between the getter portions 12 to fall. It is shown that there is a case where it is made to be.

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

DESCRIPTION OF SYMBOLS 1 Blast furnace 2 Shaft part 3 Furnace shell 10 Stave (furnace cooling stave)
DESCRIPTION OF SYMBOLS 10A stave 10B stave 10C stave 10D stave 10X stave 11 stave body 12 getter part 12a upper part getter part 12b middle part getter part 12c lower part getter part 20 cooling water piping system 21 cooling water supply pipe 22 cooling water passage 23 cooling water discharge Piping 30 Refractory

Claims (2)

A furnace body cooling stave used for cooling a furnace body of a metallurgical furnace,
It has a getter shape, and has a stave body corresponding to a getter base, and a plurality of getter portions corresponding to teeth of the getter and protruding from the stave body and extending in the horizontal direction,
A cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; a cooling medium supply pipe for supplying the cooling medium to the cooling medium flow path; And a cooling medium discharge pipe for discharging the cooling medium from the cooling medium flow path,
The width Wa of Geta portion located at the upper end of the stave body, the width Wc of Geta portion located at the lower end of the stave body, rather narrow than the width Wb of Geta portion positioned vertically intermediate portion of the stave body, Wa <Wc metallurgical furnace furnace body cooling stave, characterized in that has become.   2. The metallurgical furnace body cooling stave according to claim 1, wherein 0.8 ≦ (Wa + Wc) /Wb≦1.2. 3.