JPS6036443B2 - Safety equipment for repair inside blast furnace furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to safety equipment for repairing the inside of a blast furnace without blowing it down.

During blast furnace operation, internal refractory wear is a phenomenon that cannot be ignored, and as a result, the furnace shell may buckle and deform due to the heat load from inside the furnace, or the contents may blow out, making normal operation impossible.

Areas where the above-mentioned problems occur frequently and are critical include the furnace bottom, which is a damaged area, the lower shaft area, which is a high heat load area, and the furnace area, which is hit by charges such as ore and coke.

The lifespan of a blast furnace is determined by taking a comprehensive look at the deterioration of each part, and it is said that the lifespan is about the average.

However, in recent years, carbon bricks have been adopted for the bottom of the furnace, which has strengthened the cooling system and is expected to last longer than 20 kg. or,
The lifespan of the furnace mouth is no longer limited by the use of replaceable ore holders.

For the lower part of the shaft, in order to prevent wear and tear on the internal refractories, a cooling body with circulating cooling water or pressurized water inside, such as a metal box called a cooling plate or a cooling body cast in a pipe called a stave, is placed inside the refractory. It is buried to protect refractories.

However, even if the refractories are protected from these cooling bodies, the cooling bodies become exposed inside the furnace, and if operation continues in this condition, the cooling bodies themselves will eventually be damaged.

Even if a cooling plate is damaged, it can be safely replaced with a new cooling plate in the same position by working from outside the furnace, but in the case of a stave, due to the structure of the blast furnace, it is not possible to replace the iron shell by making a large entrance.

Also, it is possible to replace from the furnace mouth, but since handling is extremely difficult, it is not possible to replace from the outside. As a result, blast furnace operations have to be halted and repaired, and this has become the biggest factor in determining the lifespan of the blast furnace. In order to enable stable operation of a blast furnace using the staple cooling method for a long period of time, the structure must be such that the staple at the bottom of the shaft can be replaced without completely shutting down the blast furnace, and the work inside the furnace to replace it from within the furnace can be done safely. It was necessary to develop equipment that would allow this to be carried out.

It was considered impossible for workers to enter the blast furnace and repair the inside of the blast furnace because harmful gases were generated inside the blast furnace unless the furnace was completely shut down.

The present invention provides equipment that allows workers to safely enter the furnace and perform repair work inside the blast furnace, such as replacing staves or reloading refractories, without completely shutting down the blast furnace.

Next, the apparatus of the present invention will be explained based on an embodiment shown in the drawings.

At least two multiple tubes A are arranged around the outer periphery of the fixed tube 1 of the main body.
, B are provided so as to be movable in the vertical direction.

In this embodiment, a three-layer multi-tube 2,
3 (multiplex tubes corresponding to A and B), and the outermost layer tube 4 are arranged. Each tube is formed of a cylinder made of steel plate, and support fittings 18 and 19 are provided at several locations around the circumference at the inner lower part of the outer layer multiple tubes 3 and 4 for the purpose of supporting the multiple tubes 2 and 3. Next, a follower tube 6 is inserted into the main body, and an adjustment rod 9 is inserted into the follower tube 6 so as to be movable in the vertical direction.

The upper part of the fixed pipe 1 constituting the main body is a gas seal 20.
is installed to allow the internal follow-up tube 6 to slide up and down and to shut off the gas in the furnace.

Further, a gas seal 12 is also provided at the vertical sliding portion between the follower tube 6 and the adjustment rod 9. At the lower end of the adjustment rod 9,
A connecting member 10 is provided, and the load of the outermost layer tube 4 constituting the main body supports the load of an umbrella-like flared tube 5, a heat-resistant sheet 11, etc., which will be described later.

Next, an umbrella-shaped diverging tube 5 that can be extended longitudinally is hinged to the outermost layer tube 4 constituting the main body so as to be able to bend outward.

As shown in Fig. 4 a, b and Fig. 5 a, b, c, the outboard pipe 5 is fixed to both radial ends of a rectangular plate 5', a trapezoidal plate 5'', and a plate 5^ for the purpose of sealing. It is composed of a heat-resistant sheet 11.

Plate 5' is on the core side, and plate 51 is on plate 5'
As shown in FIG. 5, hinge joints 23, 23',
24.

In addition, in FIG.
By changing the mounting level and position of 5 and 26, the diameter R. The diameter changes from R2 to R3.

Therefore, the gap between the overlapping plates 5' and 5r is reduced, making it possible for the gap to become zero in the states shown in FIGS. 3 and 4. Next, the functions will be explained with reference to FIGS. 1, 2, and 3.

The safety equipment is carried into the furnace mouth 17 of the blast furnace 22 shown in FIG. 2 with the set interval L kept constant in the single unit state shown in FIG.

After fixing, the follower tube 6 is connected to the multiple tube 2 by a winch etc. from outside the furnace.
, 3, slide upward to support the loads of A and B.
Next, the adjusting rod 9 and the follower tube 6 are simultaneously lowered with a constant setting interval L2, and the lower end of the diverging tube 5 is moved downwards to the furnace contents 1.
Lower it to the top of 5.

After descending, the follower tube 6 is fixed in that position as shown in FIG.

Then, only the adjustment rod 9 is lowered. The lowering is continued until the upper flange of the outermost layer tube 4 contacts the lower flange of the multiplex tube 3. After confirming the contact, when the follower tube 6 and the adjustment rod 9 are lowered at the same time with a constant set interval, one wire, 7 Since the lengths of ' and 8 are constant, the lower end of the diverging tube 5 spreads out in a circular arc with the hinges 23 and 24 as the base points, and the diameter R of the diverging tube 5 is as the angle 0 approaches the angle 82. By adjusting the set interval L dimension depending on the installation level of the pipe 5, it is possible to adjust the diameter to an arbitrary value. At this time, while adjusting the descending speed of the adjustment rod 9 so that the lower end of the expansion tube 5 does not come into contact with the upper surface of the furnace contents 15,
The diverging tube 5 is positioned as shown in FIG. 3 so as to cover the upper surface of the tube. After determining the position, by fixing the set interval L3, the installation of the equipment of the present invention is completed and the equipment becomes ready for gas suction. In addition, for unloading the contents in the furnace, the follower tube 6 and adjustment rod 9 are set at a set interval via the wire 18 and the connecting member 10 due to the weight of the multiple tube 3, the outermost layer tube 4, the diverging tube 5, etc. It is possible to follow the unloading while maintaining L3 and corner 02.

The gas in the furnace is sucked through the gas dispersion port of the fixed pipe 1 by a blower or the like, and is dissipated to a safe place through a gas dispersion tower or dust collection equipment.

Therefore, the pressure inside the fixed tube 1, multiple tubes 2, 3, and outermost layer tube 4 is lower than atmospheric pressure, and the toxic gas 13 flows into each tube 1, 2 of the main body under negative pressure.
, 3, 4 will not leak into the space 16.

In addition, air always flows into the space 16 from outside the furnace, providing a safe working environment, allowing workers to enter the furnace and safely perform tasks such as replacing staples and folding bricks.

As mentioned above, with the safety equipment of the present invention, blast furnace blow-off had to be stopped even if other equipment could be fully used at the bottom of the shaft, which has a limited lifespan. Life expectancy can be expected to be extended.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the equipment of the present invention before it is carried into the furnace, Fig. 2 is a cross-sectional view of the same equipment lowered to the upper surface of the contents after being carried into the furnace, and Fig. 3 is a cross-sectional view of the final installed equipment of the present invention in the furnace. Fig. 4a is a plan view of the flange pipe, Fig. 4b is a partial sectional view taken along line A to A of the same as above,
Fig. 5a is an explanatory diagram showing the movement of the diverging tube in cross section;
Figure 5b is a cross-sectional view taken along line A-A, and Figure 5c is Figure 5a.
It is a sectional view taken along line B-B. 1 is a fixed tube, 2, A, 3, and B are multiple tubes, 4 is an outermost layer tube,
5 is a diverging tube, 6 is a follower tube, 7, 7', 8 are wires.
, 9 is an adjustment rod, 10 is a connecting member, 11 is a heat-resistant sheet,
12 is a gas seal, 13 is a harmful gas, 14 is a gas dissipation port, 15 is the contents inside the furnace, 16 is a space inside the furnace, 17 is a furnace □ section, 18 is a support fitting, 20 is a gas seal, 21 is a hanging hand ,
22 is a blast furnace, 23, 23', 24 are hinge joints, 25 is a hanging fitting (for 5'), 26 is a hanging fitting (for 5''). X/Diagram Next 2 Diagram Next 3 Diagram Next Final Diagram

Claims (1)

[Claims] 1 At least two layers of multiple tubes A and B are provided on the outer periphery of a fixed tube 1 having a gas dispersion port at the end so as to be movable in the vertical direction to form a main body, and the outermost layer tube 4 of the main body can be expanded and contracted. An umbrella-shaped flared tube 5 is hingedly connected so as to be able to bend outward, while a follower tube 6 is inserted into the main body, and an adjustment rod 9 is inserted into the follower tube 6 so as to be movable in the vertical direction. , the inner side of the intermediate layer tube B constituting the main body and the outer side of the follower tube 6, and the outer side of the intermediate layer tube B and the outer side of the umbrella-shaped end flare 5 are connected by hanging wires 7, 7', and 8, respectively. Safety equipment for repairing the inside of a blast furnace, which is characterized by: