JP2002285212A - Stave cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stave cooler having cooling capacity higher than that of the conventional one, and fittable at a low cost. SOLUTION: The stave cooler installed on an inner side of a shell of a blast furnace to cool a furnace wall comprises two split structures with a body thereof fixed to joining surface of the in side part of the furnace and the shell side part. A plurality of vertical grooves are provided for forming a plurality of cooling water passages on the joining surface of the in side of the furnace part. Grooves in the right-and-left direction which are connected to each other on the outlet side of each cooling water passage for forming an integrated water passage for collecting cooling water and grooves in the right-and-left direction which are connected to each other on the inlet side of each cooling water passage for forming a distribution water passage to distribute and feed cooling water are respectively formed on upper and lower parts of the joining surface of the shell side part. A water discharge pipe connected to the integrated water passage for discharging cooling water and a water feed pipe connected to the distribution water passage for feeding cooling water are respectively arranged on the upper and lower parts of the shell side surface of the shell side part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace body cooling device for a blast furnace, and more particularly to a blast furnace for increasing the arrangement density of water channels to improve the cooling effect and simplifying the structure to reduce the manufacturing cost and the installation cost. The present invention relates to a stove cooler for cooling a furnace body.

[0002]

2. Description of the Related Art As a furnace body cooling method for a blast furnace, a stave cooler having a plurality of cooling pipes arranged inside a main body is fixed to the inner surface of a steel shell of the blast furnace using bolts and nuts, and the cooling pipe inside the main body is fixed to the stove cooler. 2. Description of the Related Art A method of protecting a steel shell against heat load caused by contents or gas in a high temperature state in a furnace by supplying cooling water through a connected pipe outside the furnace is often used.

FIGS. 1 (a) and 1 (b) are a sectional structural view and a plan structural view of a conventional stove cooler, and FIG. 2 is a sectional structural view of a state in which the conventional stave cooler is attached to a blast furnace shell.

A conventional stave cooler 1 has an integrated structure in which a plurality of iron or copper cooling pipes 3 are arranged and cast inside an iron or copper casting body 2. These cooling pipes 3
Water supply pipes 4a and 4b for supplying cooling water
Are disposed, and drain pipes 5a and 5b for discharging the cooling water are disposed on the outlet side. Normally, the cooling pipe 3, the water supply pipes 4a and 4b, and the drain pipes 5a and 5b have the same inner diameter to perform cooling with a constant flow rate of the cooling water inside the casting body 2.

The stave cooler 1 is fixed to the steel shell 7 by fixing bolts and nuts 8a, 8b via bolt seats 6a, 6b having bolt fixing through holes. Also,
In each stave cooler 1, drain pipes 5a, 5b connected to the outlet side of the cooling pipe 3 of one stave cooler 1
The water supply pipes 4a, 4b connected to the inlet side of the cooling pipe 3 of the other stave cooler 1 are connected on the outer surface of the shell by connecting pipes 9a, 9b.

[0006]

The conventional stave cooler 1 is cast by placing a cooling pipe 3 made of iron or copper formed in advance at a predetermined position in a sand mold and then pouring molten iron or copper. At this time, it is necessary to firmly fix the cooling pipe 3 in the sand mold by a fixing metal so as not to be deformed or moved by heat, and the pitch of the cooling pipe 3 is limited due to the structure of the fixing metal and the work space at the time of casting. The distance between the centers of the adjacent cooling pipes 3) is required to be about 100 mm or more, and there is a problem in that the cooling capacity of the stave cooler 1 is increased to increase the cooling capacity.

Further, each cooling pipe 3 in the stave cooler 1
Since the water supply pipes 4a, 4b and the drainage pipes 5a, 5b are connected to the inlet side and the outlet side of the stove cooler 1, respectively, the steel pipe 7 is provided between the drainage pipes 5a, 5b and the water supply pipes 4a, 4b between the adjacent stave coolers 1. Connecting pipe 9 for external connection
a and 9b increase, and there is also a problem that the number of days and the cost of construction when the stave cooler 1 is attached to the steel shell 7 increase.

In view of these problems, the present invention has a higher degree of freedom in the installation density of the cooling pipes 3 in the stave cooler than in the prior art, and has a drain pipe, a water supply pipe, and a drain pipe in each adjacent stave cooler. An object of the present invention is to provide a stave cooler which has a smaller number of connecting pipes for connecting a pipe and a water supply pipe, has a higher cooling capacity than in the past, and can be mounted at low cost.

[0009]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned technical problems, and the gist thereof is as follows.

(1) In a stave cooler for cooling a furnace wall by being installed on an inner surface of a steel shell of a blast furnace, the main body has a two-part structure in which the main body is fixed at respective joining surfaces of a furnace inner part and a steel shell side part. The joint surface of the furnace inner part has a plurality of vertical grooves for forming a plurality of cooling water passages, and the upper and lower parts of the joint surface of the steel shell are connected at the outlet side of each cooling water passage. A left-right groove for forming a collecting channel for collecting cooling water and a left-right groove for forming a distribution channel connected at the inlet side of each cooling channel to distribute and supply the cooling water, and At the top and bottom of the skin side of the skin side, a drain pipe for connecting to the collecting channel and discharging cooling water and a water supply pipe for connecting to the distribution channel and supplying cooling water are provided. And stave cooler.

(2) The stove cooler according to the above (1), wherein the pitch between adjacent vertical grooves on the joint surface of the furnace inner portion is less than 100 mm.

(3) The stove cooler according to any one of (1) and (2), wherein at least the furnace inner part of the furnace inner part and the steel shell side part is made of a copper member.

(4) Each of the furnace inner portion and the steel shell side portion has a through hole for fixing a bolt, and a joint surface between the furnace inner portion and the steel shell side portion is fixed by a bolt nut. The stove cooler according to any one of the above (1) to (3), characterized in that:

(5) The stove cooler according to the above (4), wherein the joining surfaces of the furnace inner portion and the steel shell side portion are fixed by joining.

(6) The stove cooler according to any one of (1) to (3), wherein the respective joining surfaces of the furnace inner part and the steel shell side part are fixed by joining. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings.

FIG. 3 shows (a) the stove cooler of the present invention.
The cross-sectional structure diagram and the (b) planar structure diagram are shown. FIG. 4 is a plan structural view of the stave cooler body of the present invention corresponding to FIG. (A) is an AA joint surface of the furnace inner part, (b)
FIG. 3 is a plan view of the BB joint surface on the side of the steel shell.

In the stave cooler 10 of the present invention, the main body has respective joint surfaces 13 of the furnace inner portion 11 and the steel shell side portion 12.
14 and a two-part structure fixed at the joint surfaces 13 and 14 thereof.
One joint surface 13 has a plurality of vertical grooves 15 for forming a plurality of cooling water passages 20, and upper and lower joint surfaces 14 of the steel shell side portion 12 have outlets of the respective cooling water passages 20. And a lateral groove 17 for forming a collecting channel 22 for collecting cooling water, and a lateral groove 17 for forming a distribution channel 21 connected at the inlet side of each cooling channel 20 to distribute and supply the cooling water. Each having a groove 16, and
The upper and lower portions of the steel skin side surface 19 (the surface opposite to the joint surface 14) are connected to a drain pipe 24 for discharging cooling water connected to a collecting water channel 22 and a distribution water channel 21 for supplying cooling water. A water supply pipe 23 is provided.

In the stave cooler 10 of the present invention, the main body is divided into a furnace inner part 11 and a steel shell side part 12 as described above, and a plurality of grooves 15 are formed in advance on a joint surface 13 of the furnace inner part 11. Then, since the plurality of cooling water passages 20 are formed by being fixed to the joint surface 14 of the other steel shell side portion 12, the cooling pipe is fixed as compared with the conventional method in which the cooling pipe is arranged in a sand mold and cast. It is possible to improve the degree of freedom of the installation density of the cooling water channel without restriction of the fittings and the like. In the conventional method of arranging and casting a cooling pipe in a sand mold, the pitch of the cooling pipes (the center-to-center distance between adjacent cooling pipes) was required to be about 100 mm or more. The pitch of 20 (vertical grooves 15) (distance between centers of adjacent cooling water channels (vertical grooves)) is 100 mm
Cooling capacity (heat removal)
Can be improved 1.5 to 2 times as compared with the related art.

Further, the stave cooler 10 of the present invention comprises:
At the joint surface 14 of the steel shell 12, the other furnace inside 1
1 cooling water channel 2 of each groove 15 formed on the joining surface 13
The grooves 17 and 16 are formed in advance at positions (upper and lower) corresponding to the outlet side and the inlet side of 0, respectively.
Thereafter, the cooling water passage 20 for collecting the cooling water from each cooling water passage 20 and the distribution water passage 21 for distributing and supplying the cooling water to each cooling water passage 20 by being fixed to the joining surface 13 of the other furnace inner part 11 are formed. The structure is formed and connected to the drain pipe 24 and the distribution water channel 21, respectively, so that the number of the drain pipe 24 and the distribution water channel 21 is reduced to one each as compared with the conventional cast stove cooler, and the drain pipe of each stave cooler 10 is formed. The number of connecting pipes 27 for connecting the distribution water channel 24 to the distribution water channel 21 can be greatly reduced as compared with the related art.

Therefore, the stave cooler 1 of the present invention
By using 0, the stave mounting operation time can be greatly reduced as compared with the related art, and the construction cost for that can be reduced.

The bonding between the joint surfaces 13 and 14 of the furnace inner part 11 and the steel shell side part 12 is performed by the above-mentioned stave cooler 10.
A bolt fixing through-hole is provided in the furnace inside part 11 and the steel shell side part 12, and the joining surfaces 13, 14 of the furnace inside part 11 and the steel shell side part 12 can be fixed to each other by screwing bolts 18. In addition, welding may be used instead of fixing the joining surfaces 13 and 14 by the screwed bolts 18, or the screwing bolts 18 and the welding may be used together for fixing.

The method of fixing the joining surfaces 13 and 14 is not limited to these fixing methods. When the stave cooler 10 is used, the cooling water in each of the cooling water passages 20, the distribution water passages 21 and the collecting water passages 22 is removed from the joint surfaces. Any fixing method can be used as long as it can be fixed to a degree that does not leak (at a practical level).

The steel skin side surface 19 of the steel skin side part 12 (joining surface 14
Drain pipes 2 provided on the upper and lower sides of the
4 and the water supply pipe 23 can be fixed by a commonly used method such as welding or screwing.

The main body of the stove cooler 10 (furnace inner part 1)
1 and the iron shell side portion 12) As a material, iron or copper, which is commonly used, can be used.

In order to improve the cooling capacity (heat removal amount), it is preferable to use a material having a good heat transfer coefficient, such as copper. Further, since the stave cooler of the present invention has a divided structure of the furnace inner part 11 and the steel shell side part 12, a material such as copper having a high heat transfer coefficient is used for the furnace inner part 11 having a large heat load in the furnace. It is also possible to use a general material such as iron having a relatively lower heat transfer coefficient for the skin side portion 12.

FIG. 5 is a sectional structural view showing a state in which the stave cooler of the present invention is attached to a blast furnace steel shell.

The steel skin side surface 19 of the steel skin side part 12 of the main body of the stave cooler 10 of the present invention (the surface opposite to the joint surface 14).
Is provided with a bolt seat 21 having a through hole for a screw-in bolt for fixing the stave cooler 10 to the steel bar 27, so that the stave cooler 10 is fixed to the steel bar 27 by the screw bolt 26 via the bolt seat 25. be able to. Also, in each stave cooler 10,
The drain pipe 24 connected to the collecting water channel 22 on the outlet side of each cooling water channel 20 of one stave cooler 10 and the distribution water channel 21 on the inlet side of each cooling water channel 20 of the other stave cooler 1.
To the water supply pipe 23 connected to the
7 are connected on the outer surface.

In each of the stave coolers 10, the cooling water supplied to the water supply pipe 23 below the stave cooler 10 is distributed and supplied to each of the cooling water passages 20 by the distribution water passages 21, and flows from below to above the cooling water passages 20. The cooling water in each cooling channel 20 is collected by the collecting channel 22 and discharged from the drain pipe 24 below the stave cooler 10,
The water is supplied to the water supply pipe 23 below the other stave cooler 10 adjacent above the stave cooler 10 via the continuous pipe 28.

[0030]

EXAMPLES The effects of the present invention will be described below with reference to examples.

The stave cooler of the present invention has a shape as shown in FIGS.

In the furnace inner portion 11 of the stave cooler body, a length: 2,000 mm, a width: 400 mm, and a thickness: 6
As a longitudinal groove for forming a cooling water channel on a surface (a surface corresponding to the joint surface 13) of a 5 mm copper plate, a length: 1,900 mm, a width: 45 mm, and a depth: 45
7 mm-shaped rectangular grooves cut and processed were used.
Further, the steel sheath side portion 12 of the stave cooler body has a length:
2,000 mm, width: 400 mm, thickness: as a widthwise groove for forming a collecting channel and a distribution channel on a surface (a surface corresponding to the bonding surface 14) of a copper plate having a thickness of 30 mm, length: 375 mm, width : 240mm, depth: 15m
A rectangular groove having a rectangular shape of m was cut into upper and lower portions one by one.

Also, the furnace inner part 1 of the stave cooler body
Between the grooves in the longitudinal direction of 1, as holes for fixing screwed bolts, 4 holes each having a diameter of 5 mm were cut at a pitch of 500 mm in the longitudinal direction, 32 in total, and a total of 32 holes were cut. At the position of the part 12, a similar through hole for bolt fixing is cut and the joint surface between the furnace inner part 11 and the steel shell side part 12 is 32.
It was tightly fixed with a screw-in bolt.

The left end of the widthwise groove for forming the collecting channel of the surface corresponding to the steel side surface of the steel side portion 12 (the side opposite to the joining surface 14) and the widthwise groove for forming the distribution channel. Cut through holes with a diameter of 125mm one by one at the right end of the
A drain pipe and a water supply pipe at each position, inner diameter: 12
A 6.6 mm steel wall having a thickness of 6.6 mm was welded. Further, a steel pipe having the same inner diameter and wall thickness as the drain pipe and the water supply pipe was used as a connecting pipe connecting the drain pipe and the water supply pipe of each stave cooler.

As shown in FIG. 5, a stove cooler of the present invention was fixed to a steel shell of a blast furnace with bolts and nuts, and a cooling test of a blast furnace wall of the stave cooler was performed.

In order to evaluate the effect of the present invention, the conventional stave cooler shown in FIG. 1 was fixed to the steel shell of a blast furnace with bolts and nuts as shown in FIG.

The conventional stave cooler 1 has a length of 2,
000 mm, width: 400 mm, thickness: 400 mm, four inner diameters in an iron casting body 2 having an inner diameter of 50 mm, wall thickness:
This is an integrated structure in which 3.9 mm iron cooling pipes 3 are arranged and cast so that the space between adjacent cooling pipes 3 is 100 mm. In addition, on each of the inlet side and the outlet side of each cooling pipe 3, a total of eight iron water supply pipes 4a, 4b and a drain pipe 5 each having an inner diameter of 50 mm and a wall thickness of 3.9 mm are provided.
a and 5b are welded.

When the conventional stave cooler 1 is applied, the furnace inside operating surface temperature is 700 ° C., whereas when the stave cooler 10 of the present invention is applied, the furnace inside operating surface temperature is 700 ° C. However, it became 200 ° C., and it was found that the cooling capacity of the furnace body could be greatly improved as compared with the conventional case.

As a result, it is expected that the stave of the blast furnace can be significantly extended (semi-permanently) by applying the stave cooler of the present invention.

Further, the stave cooler 10 of the present invention is
The time to attach the base is the same as the conventional stave cooler 1
Could be reduced to 3/4 of the time required to attach one.

Therefore, by applying the stave cooler of the present invention, it is possible to greatly shorten the construction period and to greatly reduce the construction cost.

[0042]

According to the stove cooler of the present invention, since the installation density of the cooling water channel can be improved, the furnace body cooling capacity can be improved by applying to the blast furnace and the life of the blast furnace body can be extended. Become.

Further, since the structure of the stave cooler can be simplified as compared with the prior art, the manufacturing cost can be reduced.

Further, since the number of communication water pipes can be reduced, connection work such as connection of the communication water pipes on the outer surface of the steel shell and processing of a through-hole of the steel shell for passing the communication water pipes can be reduced. It is possible to shorten the installation work time and the construction cost.

[Brief description of the drawings]

FIG. 1A is a cross-sectional structural view of a conventional stave cooler,
(B) It is a plane structure figure.

FIG. 2 is a sectional structural view of a state in which a conventional stave cooler is attached to a blast furnace shell.

3A is a sectional structural view of a stave cooler of the present invention, and FIG.

4 is a plan structural view of a stave cooler main body of the present invention corresponding to FIG. 3, wherein (a) is an AA joining surface of a furnace inner portion,
(B) is a plane structural view of the BB joint surface of the steel shell side part.

FIG. 5 is a sectional structural view of a state in which the stave cooler of the present invention is attached to a blast furnace shell.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stave cooler (conventional) 2 Casting body 3 Cooling pipe 4a, 4b Water pipe 5a, 5b Drain pipe 6a, 6b Bolt seat with through hole for bolt fixing 7 Iron sheath 8a, 8b Fixing bolt and nut 9a, 9b Connecting pipe 10 Stave cooler (invention) 11 Furnace inner part of main body 12 Steel shell side of main body 13 Joint surface of furnace inner part 14 Joint surface of steel shell side 15 Groove for forming cooling water channel 16 For forming distribution water channel 17 Groove for forming a collecting channel 18 Bolt and nut 19 Steel side of steel bar side 20 Cooling channel 21 Distribution channel 22 Collecting channel 23 Water supply pipe 24 Drain pipe 25 Bolt seat 26 Fixing bolt and nut 27 Steel shell 28 connecting pipe

Claims (6)

[Claims] 1. A stave cooler for cooling a furnace wall by being installed on an inner surface of a steel shell of a blast furnace, wherein the main body has a two-part structure fixed at respective joint surfaces of a furnace inner part and a steel shell side part. The inner joint surface has a plurality of vertical grooves for forming a plurality of cooling water passages, and the upper and lower joint surfaces of the steel shell are connected to the cooling water outlet at the outlet side for cooling. A left-right groove for forming a collecting channel for collecting water and a left-right groove for forming a distribution channel connected at the inlet side of each cooling channel and distributing and supplying cooling water, and On the upper and lower sides of the side of the steel shell, a drain pipe for connecting to the collecting water channel and discharging the cooling water and a water supply pipe for connecting to the distribution water channel and supplying the cooling water are provided, respectively. Stove cooler. 2. The stove cooler according to claim 1, wherein a pitch between adjacent vertical grooves on the joining surface of the furnace inner portion is less than 100 mm. 3. The stave cooler according to claim 1, wherein at least the furnace inner part of the furnace inner part and the steel shell side part is made of a copper member. 4. The furnace inner part and the steel shell side part each have a bolt fixing through hole, and the respective joining surfaces of the furnace inner part and the steel shell side part are fixed by screw-in bolts. The stove cooler according to any one of claims 1 to 3, characterized in that: 5. The stave cooler according to claim 4, wherein the respective joint surfaces of the furnace inner portion and the steel shell side are fixed by joining. 6. The stave cooler according to claim 1, wherein the respective joint surfaces of the furnace inner side portion and the steel shell side portion are fixed by joining.