KR101249061B1 - Apparatus for repairing a connecting pipe bellows and method for repairing a connecting pipe bellows using the same - Google Patents

Abstract

A liaison bellows repair is disclosed. Contact tube bellows repair device according to an embodiment of the present invention is a connecting pipe bellows repair device is provided in the contact pipe is formed in the bellows, the bellows formed, comprising a refractory filling the gap of the lead and the bellows protection surrounding the bellows outside do.

Description

Applicator for repairing a connecting pipe bellows and method for repairing a connecting pipe bellows using the same}

The present invention relates to a contact pipe bellows repair device and a method for repairing a contact pipe bellows using the same. More specifically, the present invention relates to a contact pipe bellows repair device and a method of repairing a contact pipe bellows using the same, by which a bellows protection part is provided to shorten the working time when the contact pipe bellows is damaged.

The hot blast furnace used in the iron making process is a device for supplying a heat source, that is, hot blast (about 1,000 ° C. to 1,250 ° C.), required to produce pig iron in a blast furnace. The hot stove is alternately burned and blown.

1 is a schematic configuration diagram of a general hot stove. Referring to FIG. 1, a combustion process is a process of burning a mixed gas of a blast furnace gas (BFG) and a coke oven gas (COG) in a combustion chamber to heat a regenerative smoke and exhaust it from a stack. The blowing process is a process of passing the cold air of 100 ° C. to 180 ° C. sent from the blower through the regenerative smoke breeze to make hot air of 1,000 ° C. to 1,250 ° C. and sending it to the blast furnace.

A plurality of hot blast furnaces are provided, and when the at least one hot blast furnace performs a combustion process, the remaining hot blast furnace is set to perform a blowing process to continuously supply hot blast to the blast furnace.

The hot stoves are operated ten times a year, including regular repairs, planned breaks, or temporary shelter, and the supply of steam or nitrogen gas into the pipes prior to recombustion of the hot stoves. , COG) to purge.

Air supplied through the blower is installed to be introduced into the heat storage chamber through the heat storage chamber grid, and is communicated with the combustion chamber through the communication pipe of the heat storage chamber, and a combustion burner is installed at the lower side of the combustion chamber, while the horn communicating with the combustion chamber. One side of the cold room 7 is provided with a hot air main 8 is configured to supply hot air to the blast furnace. Accordingly, the contact tube 100 has a stepped alumina-based lead as an important part through which the temperature of the heat storage chamber dome (DOME) due to the combustion chamber combustion reaches a maximum of 1350 ° C. and the wind of high pressure (4.0 kg / cm 2) is passed during the blowing. It is protected by sliding steel plate for construction and skin protection, and the hot air main building is severely changed by thermal stress due to blast furnace load, abnormal power failure, blower trip (TRIP) impact.

In general, the operation of the furnace is to increase the wind supplied from the blower to 1150 ℃ ~ 1250 ℃ in the hot blast furnace equipment, and during the normal operation, the combustion in the second and the second wind is repeated repeatedly, stable blast furnace coefficient 1, 2 atmosphere without repair It should be available. On the other hand, the blowing operation as described above takes the heat stored in the heat storage chamber while the cold air (150 ° C. to 200 ° C.) supplied from the blower passes through the heat storage chamber, and passes through the combustion chamber 5 to the cold air (150 ° C.). ~ 200 ℃), and the temperature required for blowing (1200 ℃ ~ 1250 ℃) should be adjusted to supply wind to the blast furnace through the hot air main building (8), so the expansion and contraction by temperature is repeated, so the dome contact tube (100) Deformation of the lead 130 is generated, the hot wind of high heat, high pressure is transmitted to the hot blast iron shell generated between the ducts and accelerated phenomenon of the parts of the shell when red heat occurs, if left for a long time due to the creep limit Temporary bursting (explosion) of the shell may occur. FIG. 2 is a state diagram showing a state of heat generation (a) of a conventional contact tube and a state (b) in which a gap occurs due to softening and contraction expansion, and FIG. 3 shows that a groove is formed on the bellows of the contact tube.

On the other hand, the combustion chamber, the heat storage chamber, and the mixed-cooling chamber are connected to the contact tubes, respectively, and the bellows (110) is applied to each contact tube in order to protect the facility since the contraction and expansion by high temperature heat of about 1350 ° C to 1400 ° C are repeated. Is installed, there may be a large amount of cases leaking due to the occurrence of cracks (crack, 10) due to overload (high air temperature operation) and the long-term use of the equipment during operation. At this time, the work method by welding is used, but if the above method is used, cases of leaks due to cracks may occur from time to time, which may lead to a large accident.

Exemplary embodiments of the present invention affect the output due to long-term operation during cracking and rupture due to the heat load caused by the contraction and expansion of the bellows installed in each contact tube of the hot blast furnace facility for sending the high temperature air flow required for blast furnace operation. In order to solve the problem in a short time by installing the bellows protection, as well as to provide a liaison bellows repair device and a liaison bellows repair method using the same that can maintain a stable facility management.

According to an aspect of the present invention, the lead pipe is stacked inside, the contact pipe bellows repair device provided in the bellows-shaped contact tube, characterized in that it comprises a refractory to fill the gap of the lead and a bellows protection surrounding the bellows outside A liaison bellows repair device may be provided.

In this case, the contact pipe bellows repair device may further include a heat absorber formed outside the bellows to absorb heat.

On the other hand, the refractory may be pressed between the bellows and the bellows protection portion.

On the other hand, the refractory may be castable.

In this case, the heat absorber may be a cowl.

According to another aspect of the invention, (a) the first step of injecting the refractory into the gap between the lead; (b) forming the refractory on the outside of the bellows of the liaison tube; (c) installing a bellows protection unit on the outside of the bellows; And (d) secondary press-fitting of the refractory between the bellows and the bellows protector.

In this case, the step (b) may further include forming a heat absorber.

Contact tube bellows repairing apparatus and a contact tube bellows repair method using the same according to an embodiment of the present invention can reduce the working time when the contact tube bellows damage, it is possible to install economically in terms of installation cost.

In addition, the contact pipe bellows repairing apparatus and the contact pipe bellows repair method using the same according to an embodiment of the present invention, the maintenance repair cost is reduced due to the stabilization of the hot stove facility, to prevent energy waste by reducing the air purge (Air purge), It is possible to improve the safety of workers because the risk of high temperature during work is low.

1 is a schematic configuration diagram of a general hot stove.
Figure 2 is a state diagram showing a state in which a gap occurs due to the exothermic state and softening shrinkage expansion of the conventional contact tube.
3 is a view showing a groove formed on the bellows of the liaison tube.
Figure 4 is a cross-sectional view of the contact pipe bellows repair apparatus according to an embodiment of the present invention.
5 is a cross-sectional view of a contact pipe bellows maintenance device according to an embodiment of the present invention subjected to primary indentation.
Figure 6 is a state diagram showing the exterior of the contact pipe bellows repair device according to an embodiment of the present invention in which the refractory and the heat absorbing material is installed outside the bellows.
7 is a cross-sectional view of the bellows protector.
8 is a front view of the bellows rear part.
9 is a state diagram in which a press-fitting plug blocking device is installed at the press-fitting opening of the bellows protection part.
10 is a flowchart of a method for repairing a contact pipe bellows using a contact pipe bellows repairing device according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations of embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

This will be described in detail with reference to FIGS. 4 to 9 with respect to the contact pipe bellows repair apparatus according to an embodiment of the present invention.

Figure 4 is a cross-sectional view of the contact pipe bellows repair apparatus according to an embodiment of the present invention. 5 is a cross-sectional view of a contact pipe bellows maintenance device according to an embodiment of the present invention subjected to primary indentation. Figure 6 is a state diagram showing the exterior of the contact pipe bellows repair device according to an embodiment of the present invention in which the refractory and the heat absorbing material is installed outside the bellows. 7 is a cross-sectional view of the bellows protector. 8 is a front view of the bellows rear part. 9 is a state diagram in which a press-fitting plug blocking device is installed at the press-fitting opening of the bellows protection part.

Contact tube bellows repair device according to an embodiment of the present invention, as shown in Figure 4, may include a bellows 110, refractory 200, heat absorbing material 300 and the bellows protection unit 400 of the contact tube. .

The interior of the bellows 110 of the liaison tube is three-stage and the reed 130 is stacked and the refractory can be inserted by a press-in operation in the gap generated due to thermal expansion in the stack. Figure 5 shows a contact pipe bellows repair device according to an embodiment of the present invention subjected to the primary indentation.

Refractory 200 and the heat absorbing material 300 may be installed on the outside of the bellows 110 of the contact pipe to prevent leakage. Figure 6 shows the installation of the refractory and the heat absorber outside the bellows of the contact pipe. The refractory 200 may be castable. The refractory is installed on the outside of the bellows 110 of the contact pipe, and a heat absorber that is capable of absorbing heat and burning on the outside of the refractory is installed. In this case, the heat absorbing material 300 may use a cowool.

Bellows rear portion 400, shown in Figures 7 and 8 may be installed on the outer shell of the contact tube. As shown in FIGS. 7 and 8, the bellows protection part 400 has a cylindrical shape in which a hollow part is formed. The bellows protection unit 400 may be separated into two or four and may be installed by welding outside the bellows 110 of the contact pipe.

Refractories may be inserted into the space between the bellows 110 and the bellows protection unit 400 of the contact pipe by a press-fit operation. In order to insert the refractory, the bellows protection part 400 may be formed with a press-fitting hole (not shown) to thereby perform a refractory press-fitting operation such as a castable. After the press-fitting of the refractory is completed, the press-fitting opening (not shown) may be blocked by the press-fitting blocking device 410. At this time, the press-fitting plug blocking device 410 may use a bolt. 9 shows that the press-fitting opening blocking device is installed at the press-fitting opening of the bellows protection part.

10 is a flowchart of a method for repairing a contact pipe bellows using a contact pipe bellows repairing device according to an exemplary embodiment of the present invention.

Contact tube bellows repair method using a contact tube bellows repair device according to an embodiment of the present invention, as shown in Figure 10, first, the hot stove to repair the bellows of the contact pipe (S110).

Next, the refractory material is first press-fitted into the bellows 110 of a hot stove. In order to press the refractory material into the bellows, it may be press-fitted into a gap formed outside the bellows, or a new indentation may be formed in the bellows to roll the refractory through it. Figure 5 shows a contact pipe bellows repair device according to an embodiment of the present invention subjected to the primary indentation.

Thereafter, the refractory and the heat absorber is installed outside the bellows (S130). At this time, the refractory may be installed first, and a heat absorbent capable of absorbing heat without burning well on the outside of the refractory may be installed. Figure 6 shows the installation of the refractory and the heat absorber outside the bellows of the contact pipe.

Next, the bellows protection unit 400 may be installed in the bellows 110 of the contact pipe. The bellows protection part 400 may be installed by welding to the outside of the bellows 110.

Then, in order to fill the empty space between the bellows 110 and the bellows protection unit 400 of the contact tube with the refractory, the refractory is secondarily press-fitted into an indentation hole (not shown) (S150). Figure 4 shows a contact pipe bellows repair device according to an embodiment of the present invention subjected to the secondary press.

Finally, after the refractory material is press-fitted, the press-fitting opening is blocked by the press-fitting blocking device (S160). 9 shows that the press-fitting opening blocking device is installed at the press-fitting opening of the bellows protection part.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art may implement the present invention in other specific forms without changing the technical spirit or essential features of the present invention. You will understand that. The embodiments described above are therefore to be considered in all respects as illustrative and not restrictive.

100: liaison 110: bellows
200: refractory 300: heat absorbing material
400: bellows protection unit 410: indentation blocking device

Claims (9)

It is a liaison pipe bellows repair device which is provided in a liaison pipe with bellows formed inside,
Refractories to fill the gap between the lead and
And a bellows protection unit surrounding the outside of the bellows. The method of claim 1,
The contact pipe bellows repair device is a contact pipe bellows repair device, characterized in that it further comprises a heat absorbing material formed on the outside of the bellows to absorb heat. The method of claim 2,
And the refractory material is press-fitted between the bellows and the bellows protection part. The method of claim 1,
The refrigeration pipe bellows repair device, characterized in that the refractory is castable. The method of claim 2,
Contact pipe bellows repair device, characterized in that the heat absorber is cowl. A method for repairing a contact pipe bellows using the contact pipe bellows repair device according to any one of claims 1 to 5,
(a) first indenting the refractory into the gap between the leads;
(b) forming the refractory on the outside of the bellows of the liaison tube;
(c) installing a bellows protection unit on the outside of the bellows; And
and (d) secondary press-fitting the refractory between the bellows and the bellows protector. The method according to claim 6,
And the refractory material is castable. The method according to claim 6,
The step (b) is a contact pipe bellows repair method, characterized in that it further comprises forming a heat absorber. The method of claim 8,
The heat absorber is a cowl bellows repair method, characterized in that the cowl.

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