JPS609810A - Blast furnace - Google Patents

Abstract

PURPOSE:To enable replacement and additional installation of coolers when a cooling plate and stave cooler are worn and to extend the life of a blast furnace of a cooling plate and stave cooler system by providing preliminarily a shell hole necessary for replacing the coolers. CONSTITUTION:A cooling plate blast furnace 19 of, for example, a cooling plate- shell protection type is provided preliminarily with a hole 33. The ends of lifting and guiding wire ropes 12, 13 lowered through an opening 3 at the furnace top are pulled and fixed to an inspection port 33 in the furnace through a wire rope insertion hole 30 provided preliminarily to a shell protection type cooling plate 21 in the stage of replacing the worn plate 21. The cooling plate is thereafter pushed out to the inside of the furnace from the outside of the furnace, is hoisted by the wire rope 12 and is carried to the outside of the furnace through an opening 3. A shell protection type cooling plate 7 to be replaced is suspended by means of the rope 12 down to the prescribed position through the opening 3 and is then attracted to a shell 5 by a pulling bar 26 to attach the plate 7 to the shell. The plate is fixed by a cooling plate fixture 25 and the repair of the blast furnace is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blast furnace in which when a skin protection type cooling plate or a stave cooler is worn out, it can be replaced in a planned manner to maintain the furnace body.

In general, during blast furnace operation, the cooling device installed at the bottom of the shaft and in the belly of the furnace is either a shell-protected cooling plate or a stave cooler. ] is
Because the heat load inside the furnace is higher than that on the sleeves, wear progresses quickly, and as a result, the heat load inside the furnace is applied to the furnace body shell, resulting in cracks in the furnace body shell and even gas leakage. These problems occur and greatly affect the rate of reactor life, so it is necessary to replace the worn shell protection type cooling plate or stave cooler based on the results of the reactor body diagnosis. The structure for cooling the furnace body of a conventional blast furnace is known from the Steel Handbook and many patent publications. On the other hand, replacement of these iron skin protection type cooling plates or stave coolers can be roughly divided into the following two methods.

(Method A) After the blast furnace operation is completely stopped and the furnace body has cooled, a worker enters the furnace and removes the contents inside the furnace, and then hydraulically removes the worn shell protection type cooling plate or stave cooler from outside the furnace. After pushing it out into the furnace with jacks and removing it, use the lift wire to suspend the replacement shell-protected cooling plate or stave cooler from the furnace shell opening at the top of the shaft to a designated location inside the furnace. This method involves lowering the furnace, pulling them in from outside the furnace, attaching them, and fixing them.

(Method B) After the blast furnace is operated at a reduced scale and the wind is stopped, the lifting wire and guide wire are suspended from the opening at the top of the furnace to a predetermined level inside the furnace. Next, in order to be able to hang the worn out P-shell protection type cooling plate or stave cooler with the lifting wire inside the furnace,
Gas holes are opened in the shell, cooling plate, and stave cooler from outside the furnace, and the lifting wire inside the furnace is pulled and fixed through the openings in the steel shell, and then pushed into the furnace using a hydraulic jack from outside the furnace. Remove it. Next, after checking whether there are any deposits on the inner surface of the steel shell inside the furnace through the shell opening, use the lifting wire to move the steel shell protection type cooling plate or stave cooler to be replaced from the furnace top opening. This method involves cleaning out a predetermined location, pulling it closer to the furnace shell side than outside the furnace, and attaching and fixing it.

However, method A is generally performed in blast furnace renovation work, and other methods that require workers to enter the furnace are difficult from a safety standpoint. In addition, method B has the advantage that the shell-protected cooling plate or stave can be replaced after the blast furnace is shut down due to reduced-scale operation and the stave can be replaced. Because the holes are drilled, the precision of the holes is poor5, and there is a concern that this may induce cracks in the shell, which remains a problem when trying to extend the life of the blast furnace by replacing the shell-protected cooling plate or stave. become.

As such, conventional methods have various drawbacks. This is because in the past, once the blast furnace shell was exposed, it was assumed that the blast furnace would need to be repaired, so no effective cooling system replacement method had been considered. Even methods A and B mentioned above were recently devised, and those skilled in the art have not yet developed the soil in which a blast furnace with a structure devised to maintain the blast furnace body is proposed. is the current situation.

In view of the current situation, the present invention solves the drawbacks of the conventional system. In other words, the present invention provides a method for maintaining the furnace body in the event that the cooling plate installed on the steel shell as a cooling device or the cooling plate (3) is worn out. The purpose of the present invention is to provide a blast furnace that can be replaced from a plate type to a stave cooler type or vice versa. In addition to the openings in the steel shell for installing the cooling water supply and drainage pipes of the cooling system required for current furnace body cooling in blast furnaces using the cooling plate or stave cooling method, This blast furnace is constructed by providing the necessary opening of the shell in advance on the shell. In addition, the above cooling device is a cooling board''!
, P are stave coolers, which are preferably configured with holes penetrating through the cable body.

Now, the details of the present invention can be understood by referring to the embodiments shown in FIGS.

Firstly, in the feature of the present invention described above, the shell openings provided in advance in the blast furnace shell for cooling device replacement and the shell openings for observing the inside of the furnace are expressed in terms of shell porosity. 2-5% for cooling plate type blast furnaces and 5-20% for stave type blast furnaces.
It is preferable to use a blast furnace installed at 4-%.

Secondly, it is preferable that the above two types of shell openings and fittings provided in advance are provided in the blast furnace shaft lower part and the blast furnace belly.

These reasons are that the area where the cooling device of the blast furnace body is most severely worn and requires replacement is limited to the above-mentioned locations, and if the open area ratio is outside of 2-5% or 5-20%, There is a risk that the strength of the blast furnace body will be difficult to maintain, and furthermore, cooling devices may be added or replaced at these locations to match the degree of damage to the furnace wall over the years of operation of the blast furnace. This is because they discovered that it is possible to prolong life.

Thirdly, it is preferable to install metal fittings into the holes in the steel shell provided in advance, and to attach a blind plate when the holes are not needed. The reason is.

This is because it is preferable to extend the life of the blast furnace by taking safety measures to prevent the gas inside the furnace from leaking through the openings.

Since the present invention is configured in this way, it has the following effects.

(a) For blast furnaces, in addition to the holes in the shell for attaching the cooling water supply and drainage pipes for the cooling device required for the current furnace body cooling, the holes in the shell necessary for replacing the cooling device must be made in advance. Since the cooling system is installed in Since it can be carried out in a timely manner, the blast furnace body can be properly managed and the life of the blast furnace can be extended.

(B) In addition, if the cooling device is provided with holes that pass through the cables, the installation or replacement of the device can be carried out smoothly, and no mechanism for attaching the cables is added to the cooling device. Expansion or replacement of equipment is not permitted.

The present invention can be further understood by the embodiments shown in FIGS. 1 to 8 (A) to (B).

In Figures 1 to 8 (a) to (opening), 33 is a hole in the shell necessary for replacing the cooling device 7 and Z3 installed in advance, and this hole also serves as a hole in the shell for observing the inside of the furnace. Blind plates 45 are attached to the openings 33 in the steel shell, which are located in positions that are not needed for the cooling device 7 and B, which also serve as the cooling device, and are configured to prevent gas from leaking in the furnace.Additional cooling devices will be required in the future for these. These shell openings 33 are determined in number and drilled in the shell 5 when the furnace life is set in advance during blast furnace design.

The open area ratio is 2 to 5% in a cooling plate type blast furnace and 5 to 20% in a stave type blast furnace, and is provided at the bottom of the shaft and in the belly of the blast furnace. The openings 33 are used for replacing or expanding the cooling devices 7 and 7, and the openings 33 also serve as observation holes during the work or for replacing or expanding the cooling devices.

FIG. 1 shows a state in which a shell-protecting cooling plate is attached to the exposed portion of the five-furnace shell to maintain the furnace body in a blast furnace using the cooling plate cooling method. In the cooling platen blast furnace body 1, a lifting wire 12 and a guide wire 13 are used from the furnace top opening 3 to the exposed furnace skin part 6 where the shaft lower part 9 and the furnace wall brick stacked part 4 of the furnace part 8 have been worn out or disappeared. In this method, the shell protection type cooling plate 7 is suspended to a predetermined position in the furnace, and is attached to the exposed steel shell part 6 to protect the furnace body shell 7-5 and maintain the furnace body.

Figure 2 shows that in a cooling plate-shell protected cooling plate blast furnace, if the shell-protected cooling plate or stave cooler is worn out during the operation process and the cooling function is reduced, they can be replaced to maintain the furnace body. Indicates the state to be performed. Cooling plate - Iron shell protected cooling plate (
(or stave cooler) In the blast furnace body 19, the steel shell protection type cooling plate 2 is damaged in the shaft lower part 9 and the furnace part 8.
1, and lift wire 12 and guide wire 1.
3 and carry it out of the furnace through the furnace top opening 3. Next, replace the shell-protected cooling plate 7 from the furnace top opening 3.
In this method, the furnace body is maintained by suspending it to a predetermined position in the furnace using the lifting wire 12 and guide wire 13, and then attaching it to the removed position.

FIG. 3 shows a state in which, in a stave blast furnace, when the stave cooler is worn out during the operation process and its cooling function is degraded, the stave cooler is replaced to maintain the furnace body. Stave-type blast furnace furnace body 22 [Here, remove the stave cooler U that has been worn out at the shaft lower part 9 and the furnace part 8, lift it up with the lifting wire 12 and the guide wire 13, and remove it from the furnace top opening 3. Carry it out. Next, the stave cooler 5 to be replaced is suspended from the furnace top opening 3 to a predetermined position in the furnace from the lifting wire 12 and the guide wire 13I, and then installed at the removed position to maintain the furnace body.

Figure 4 shows the state of replacement work when replacing a worn out shell-protected cooling plate in a cooling plate - shell-protected cooling plate (or stave cooler) blast furnace. The ends of the lifting wires 12 and guide wires 13 that have been lowered from the furnace top opening 3 are inserted into the furnace interior inspection opening 33 via the wire passage holes 30 provided in advance of the worn steel shell protection type cooling plate 211 to be removed. After it is pulled and fixed, it is pushed out from outside the furnace into the furnace, lifted up by the lifting wire 12, and carried out from the furnace top opening 3.

Next, the shell-protected cooling plate 7 to be replaced is suspended from the furnace top opening 3 to a predetermined position using the lifting wire 12, and then pulled to the steel shell 5 using the pulling rod 26. The furnace body is repaired by attaching it and fixing it with the cooling plate mounting hardware.

Fig. 5 shows the state of work to remove the cooling plate when replacing a worn out cooling plate in a blast furnace using the cooling plate - shell protected cooling plate (or staple cooler); in this case, the present invention This shows that the effect of the furnace interior inspection port and the wire passage hole of the cooling plate is large.Furnace top opening 3
Then, the lifting wire 12 and guide wire 13 are lowered to a predetermined position inside the furnace. Next, after cleaning the wire passage hole 30 of the cooling plate 21 to be removed, use the pulling rod 26 to remove the lifting wire 12.
The guide wires 13 are pulled together to the iron shell 5 and taken out of the furnace, and the ends of these wires are passed through shackle fittings 37 and fixed. Next, after gas-cutting the cooling plate fixing bolts 20, the water supply and drainage pipe ends 34 of the cooling plate 21 to be removed are cut using a jig 38.
It is pushed out into the furnace using a hydraulic jack 39, lifted up using a lifting wire 12 and a guide wire 13 temporarily installed inside the furnace, and carried out of the furnace through the furnace top opening 3.

Figure 6 shows the state of work to install a cooling plate when replacing a steel shell protected type cooling plate or a stave cooler. This shows that the wire holes in the cooling plate and the cooling plate are highly effective.

Lifting wire 12 and guide wire 1 at furnace top opening 3
After passing the end of 3 through the wire through hole 30 of the cooling plate 7 to be replaced and fixing it with a shackle hardware 37, the wire is suspended to a predetermined position in the furnace. Next, the pulling rods 26 are inserted into the furnace through the openings of the cooling plate mounting hardware part to which the cooling plate 7 is attached, and after the pulling rods 26 are looped around the pulling wire 31 of the cooling plate 7, the iron skin 5ζ is pulled. , the cooling plate 7 is brought into close contact with the inner surface of the steel shell by further pulling with the chain block 32, and the steel skin protection type cooling plate 7 is fixed with fixing bolts 20 at the cooling plate mounting hardware part. Cooling plate 7
After confirming that the wires have been installed and fixed in place and loosening the lifting wires 12 and guide wires 13 temporarily installed inside the furnace, open the steel skin necessary to replace the cooling device installed in advance. At the hole 33, remove the shackle hardware 37, lift up each wire temporarily installed in the furnace, and open the furnace inspection opening 3.
Place a blind plate on step 3 and close the lid. Incidentally, the steel shell openings 33 and the wire passage holes 30 or 42 of the cooling plate 7, which are necessary for replacing these pre-provided cooling devices, are sealed by press-fitting a refractory material separately.

11- Figure 7 shows the state of work to remove a worn out stave cooler when replacing the stave cooler.The steel shell opening 33 and the stave cooler's wire passage hole 30 necessary for replacing the pre-installed cooling device are shown in Figure 7. Or it shows that the effect of 42 is large. The lifting wire 12 and the guide wire 13 are lowered through the furnace top opening 3 to a predetermined position inside the furnace. Next, remove the blind plate 45 of the steel shell opening 33 necessary for replacing the pre-installed cooling device of the stave cooler 24 to be removed, and remove the inside of the steel shell opening 33 necessary for replacing the pre-installed cooling device. After cleaning the wire passage hole 42 of the stave cooler, insert the pull rod 26 into the furnace, loop the lifting wire 12 and guide wire 13, pull it toward the steel shell side and take it out of the furnace. Shackle hardware 3 on the end of
7 and fix it. Next, after gas-cutting the fixed pole 29 that fixes the stave cooler and the cooling water supply and drainage pipes 27 and 4, the water supply and drainage pipe end 40 is pushed into the furnace with a hydraulic jack 39 via a jig 38, and It is hoisted up using a lifting wire 12 and a guide wire 13 temporarily installed inside the furnace and carried out from the furnace top opening 3. Since the installation of the stave cooler is the same as the construction shown in FIG. 6, the explanation will be omitted, but by using this construction method, the construction can be easily performed from outside the furnace.

As explained above, the blast furnace according to the present invention is applicable when a shell-protected cooling plate or stave cooler is installed on the exposed part of the shell in a cooling plate blast furnace, and when the shell-protected cooling plate or stave cooler If replacement is required due to
By preparing an inspection port and a wire passage hole in the furnace in advance (!:I), the construction can be carried out more easily and smoothly, so the construction can be carried out even if it is not a blast furnace renovation work as in the conventional method A. In addition, unlike the conventional method B, there is no damage to the furnace shell due to on-site gas cutting and opening of the shell. The blast furnace of the present invention has the advantageous effect of being able to carry out maintenance work on the furnace body, thereby extending the life of the furnace, and avoiding huge capital investment for renovations. It is also beneficial because it allows the cooling method to be replaced with a stave-type blast furnace, which is completely unseen in the past.

[Brief explanation of drawings]

Each drawing is an explanatory diagram showing an embodiment of a blast furnace and a cooling device according to the present invention, and FIG. A front view showing the construction state. Figure 2 is a front view showing an example of how to maintain the furnace body by replacing the cooling plate (or stave cooler) in a cooling plate-protected cooling plate blast furnace and its construction status. A front view showing an example of a method for maintaining the furnace body through replacement and the state of the work. Fig. 4 is an explanatory diagram showing an example of the state of the cooling plate replacement work in a cooling plate-protected cooling plate blast furnace and a specific work method. 5(A), (C), and (D) are diagrams sequentially showing the construction process of the replaceable stave replacement method and apparatus of the present invention in the process of removing the iron skin protection type cooling plate. FIGS. 6A, 6B, and 6C are diagrams sequentially illustrating the installation process of the replaceable stave replacement method and apparatus of the present invention in the process of installing a steel skin protection type cooling plate or stave cooler. Figures 7 (a), (o), (c). (d) and (e) are diagrams sequentially showing the construction process of the replaceable stave replacement method and device of the present invention in the stave cooler removal process. Figures 8 (a) and 8 (b) are diagrams showing the state in which blind plates are attached to unnecessary shell openings. ■-Cooling plate blast furnace body, 2-cooling plate, 3-furnace top opening 54
- Furnace wall brickwork, 5 - Iron shell, 6 - Shell exposed part, 7 - Shell protection type cooling plate, 8 - Furnace belly, 9 - Shaft lower part, 1
0- Middle shaft, 11- Upper shaft, 12- Lifting wire, 13- Guide wire, 14- Guide wire opening, 15- Guide wire lifting device, 16- Lifting wire lifting device, 17 One check floor, 18- Reduction level, ] 9-Cooling plate - Shell-protected cooling plate blast furnace body, K - Shell-protected cooling plate fixing bolt, 21- Worn shell-protected cooling plate, 22- Stave type blast furnace body, n - stave cooler,
24 - Worn stave cooler, 5 - Cooling plate mounting hardware, 2
6-Drawing rod, 27-Water supply piping, Indication-Drainage piping, 29-Stave cooler fixing bolt, 30-Wire through hole, 3
1-15- Pulling wire, 32- Chain block, 33-4-
Steel shell opening required for replacing the cooling device provided for the purpose, 34-
Water supply pipe end, 35 - Drainage pipe end 536 - Cast water cooling pipe, 37 - Shackle hardware, 38 - Jig, 39 - Hydraulic jack, 40 - Stave water supply pipe end, 41 - Stave drainage pipe end, 42 - Stave wire through hole, 43- Combing hardware, 44- Combing blind plate, 45- Blind plate, 4
6 - Shell drilling required for cooling system replacement. Patent applicant Representative patent attorney Tomoyuki Yafuki (and 1 other person) 16- Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) In a blast furnace with cooling plate or stave cooling method,
In addition to the holes in the shell for attaching the cooling water supply and drainage pipes for the cooling system necessary for cooling the current furnace body, the holes necessary for replacing the cooling system mentioned above were previously provided in the shell. Characteristic blast furnace. (2) The blast furnace according to claim 1, wherein the cooling device is a cooling plate or a stave cooler, and these are constructed by providing holes passing through the cables.