JPS5899682A - Hot repair method for lining of shaft furnace and anchor grinding formwork for repair - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for reliably repairing damaged parts of a blast furnace lining and an anchor formwork for repair.

Conventionally, the spraying method used as a hot repair method for blast furnace lining involves removing the coarse part of the spraying material.
, the fine powder part scatters and reduces the loss by 10%, and the total loss reaches 20fstC4. Furthermore, with the press-fitting method, it is difficult to accurately locate the damaged area, and the position of the press-fit hole is often misaligned, resulting in a complete failure to complete the intended repair.

Furthermore, with conventional spraying and press-in methods, it is difficult to provide anchors with an appropriate shape to support the installed monolithic refractories, and it is not possible to install them sufficiently. It had poor durability.

The present invention solves these drawbacks and, as detailed below, operates the blast furnace on a reduced scale to accurately know the damage situation and location of the blast furnace lining when it is in a hot state. The purpose of the present invention is to provide a method for performing accurate repair and an anchor lid frame for repair using this method.

The gist of the present invention is the above-mentioned claim 1!14
Although it is clearly stated in section r, it will be explained in detail based on the attached drawing w#lc showing an embodiment of the present invention.

As shown in Fig. 1, the furnace contents 2 in the blast furnace 1 are
1 to 2 mK below the scratched point s, and perform continuous operation at a continuous speed of about 1.
Descend at 2m/hr. The limit of the reduction distance is 14 rpm from the stop line in terms of blast furnace operation. It was,
The rise in temperature at the top of the furnace at ζ0 is suppressed by water sprinkling at the furnace mouth and charging water. Observe the exact position of the exposed furnace wall damaged area 50, drill the required number of holes 4 penetrated by the furnace tube from the outside of the damaged area iIO furnace, and insert the hook-shaped tip K11 from the ζO opening 4.
Insert the bent lid frame support hardware 5 into the furnace, and use a crane to cross the opening 4 of the blast furnace 1 furnace top O armor hole, manhole, etc.
No. 28, suspended by wire using hoist, winch, etc. 7! Confucian [10
A formwork with anchors 11 (the board width is determined by the degree of damage at the damage point S)! into the furnace, bring it close to the damaged area 5, hook the anchor 11 of the formwork 9 with the hook of the frame support hardware 5, and remove the damaged area! draw them close together,
Tighten the threaded part 1211C nut 20 of the formwork support hardware 5 and tighten the iron skin for 14km! Set. iii The frame support hardware 5 is the formwork 9
．． At least two upper and lower holes are prepared for each frame, and a blind cover 15 is provided over the hole 4 by bolting, welding, etc. to prevent leakage of the gas inside the blast furnace 1. Formwork 90 both sides and bottom O
The side plate has the remaining lining at damaged location 5! If you add heat-resistant felt 13* to improve the performance, it will be stormy.

The monolithic refractory is passed through from the outside of the furnace to the inside of the furnace in the upper part of the damaged area 1.
In the case of the upper part of the shaft of the blast furnace 1, the monolithic refractory is poured into the formwork 9 and the damaged area 30 using a sychute (not shown) through the O opening 6 such as the armor hole or manhole.
This process of pouring into the gap is repeated in the circumferential direction of the blast furnace.

Formwork! The gap between the mold and the formwork 9 can be removed at the same time as the pouring work or after the pouring work is completed, by inserting the pipe 17 into the furnace and spraying the refractory through the armor hole at the top of the blast furnace 1 and the opening 6 in the manhole depth. The spraying of shaped refractories is carried out. The monolithic refractory used was clay-like Yastapur refractory (chemical composition:
It is a Goose Os 59 fk, l1l (h471G), where 1- is the work floor and 19 is the pulley.

In addition, regarding the repair anchor part frame of the present invention, regardless of the above-mentioned specific structure, a plurality of anchor members are provided outside both sides of the 011 body whose upper surface and the side surface facing the construction surface are open,
The box body has a structure in which a plurality of anchor members are provided toward the open side surface, and heat-resistant felt is attached to the wavy side edges.K has the effect of increasing the closeness with the remaining lining. There is.

When the damaged part 3 of the blast furnace lining is repaired using this construction method, the hole 4 can be made accurately from the damaged part sK of the furnace exterior, as shown in Fig. 5, and the anchor 11 of an appropriate shape can be made.
The formwork 9 with electrically attached can be accurately connected to the damaged part 3KII1 by the frame support hardware 5, and compared with all-spraying construction, when combined with pouring construction, the rebound field for the total construction amount is The loss rate can be reduced. Furthermore, since the anchors 11 having an appropriate shape to support the constructed monolithic refractories are sufficiently firmly fixed, the durability of the constructed monolithic refractories is increased.

As described above, according to the present invention, damaged parts of the blast furnace lining can be reliably repaired while hot, and the life of the blast furnace can be greatly extended.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view illustrating the repair method according to the present invention, Fig. 2 is a perspective view of the lid frame used in the repair method of the present invention, and Fig. 3 is a view taken along the arrow in Fig. 1 after the repair is completed. . In the figure, 1-hole blast furnace, 2-hole furnace contents, S is damaged area, 4-Fi hole, 5-hole formwork support hardware, 6-hole armor hole. Manhole hole opening, 7 is crane, hoist. Winches, 8Fi wire, 9ti formwork. 10 #i side plates, 11 anchors, 13 heat-resistant felt, 14 Fi blast furnace shell, 15 blind lids. 14 is the inlet, 17 is the pipe for spraying refractories.

Claims (1)

[Claims] +1) Blast furnace lining) Make the required number of holes through the damaged area from the outside of the furnace to the inside of the furnace, and insert the metal frame supporting hardware into the furnace through the holes. Open the armor holes, manholes, etc. at the top of the blast furnace.Use a crane, hoist, winch, etc., to suspend the formwork into the furnace using a wire and hook it with the lid frame support metal fittings to the damaged area. Blast furnace lining hot repair characterized by seven features: fixed in contact with one another, pouring monolithic refractories into the space between the damaged area and the lid frame, and spraying monolithic refractories into the gap between the lid frames. Method. (2) Box O with open top surface and side surface facing construction WK
This is a lid frame with an anchor for repairing a blast furnace interior, in which annular parts are provided on the outside of both sides, and an anchor s1t is molded into the scissors box body with a radius of 11 km. The formwork with anchors for hot repair of a blast furnace lining according to claim 2, wherein a heat-resistant felt is attached to the edge of the vented surface.