JPH09241713A - Method for repairing cooling device of furnace body in blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute repairing of a cooling device of furnace body in a blast furnace with closely sealing crack and excellent in the workability by pouring a liquid seal agent easily dissabable in cooling water, penetrating it into the crack and solidifying, at the time of developing the crack of a cooling pipe. SOLUTION: At the time of developing the crack of the cooling pipe in a stave cooler for cooling the furnace body in the blast furnace, the dissoluble liquid seal agent easily dissolvable the cooling water to the cooling pipe is poured. This seal agent is penetrated into the crack and solidified to closely seal the crack and repair the leaked position. As the other way, the cooling water to the cooling pipe developing the crack is shut off, and after emptying the cooling pipe, the liquid seal agent is filled up in the pipe and penetrated into the crack and solidified, and after closely sealing the crack and repairing the leaked position, the liquid seal agent is removed. The liquid seal agent is prepared by dissolving a base material consisting essentially of a synthetic resin or synthetic rubber with a solvent, and after penetrating into the crack, the solvent is evaporated dried and viscoelastic or sticking material is formed in the inner part of the crack to develop the sealness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a furnace body cooling device for a blast furnace.

[0002]

2. Description of the Related Art A cooling pipe inside a stave cooler for cooling a blast furnace body is affected by thermal deformation of the stave cooler due to fluctuations in heat load from inside the furnace, causing cracks and leakage of cooling water. Sometimes. As the first method of repairing the cooling pipe of a conventional stave cooler, the water supply and drain pipes to the stave cooler are separated outside the furnace, and the irregular refractory is poured into the cooling pipe of the stave cooler from both ends, A method is adopted in which the plate is covered with a lid to kill the function of the cooling pipe.

As a second method, Japanese Patent Application Laid-Open No. 58-19416 proposes that the coating material is conveyed by gas from the inner surface of the cooling pipe to the damaged portion and sprayed for repair. As a third method, JP-A-57-19309 proposes to pass a flexible tube through a broken pipe and then pass cooling water through the flexible tube. As the fourth method,
In Japanese Patent Laid-Open No. 61-107090, a flexible tube is passed through a broken pipe, an amorphous refractory material is press-fitted from outside the furnace body into a gap between the broken pipe and the tube, and then cured and cooled through the tube. It is proposed to pass water.

As a fifth method, in Japanese Patent Laid-Open No. 52-32803, a flexible tube is passed through a broken pipe, and a cooling medium or another fluid is supplied to this flexible tube at high pressure to expand and restore the cross section of the flow path. Later, it is proposed to pass cooling water through the tube. Further, a liquid sealant is commercially available as a water leakage preventing agent for a radiator for a liquid cooling type internal combustion engine.

[0005]

SUMMARY OF THE INVENTION In the conventional repair method,
The first method completely eliminates the cooling function of the cooling pipe. In the second method, there is a risk of peeling or re-damage of the coating material, and repair reliability is low. In the third method, since there is a gap between the cooling pipe and the tube, the heat transfer property is poor and the cooling effect is scarce. The fourth and fifth methods improve the decrease in heat transfer due to the gap of the third method, but the thermal conductivity of the refractory is low, and the gap can be completely eliminated even if the cross section of the flow path is expanded and restored. It is difficult to repair because it is difficult. Therefore, an object of the present invention is to provide a method of repairing a blast furnace furnace body cooling device which is excellent in cooling property and is excellent in workability.

[0006]

Means for Solving the Problems The present invention has been made to solve the above problems. As means therefor are: (1) When a crack occurs in a cooling pipe of a stave cooler for cooling a blast furnace body, A method for repairing a furnace body cooling device for a blast furnace, which comprises injecting an easily soluble liquid sealant into cooling water into the cooling pipe, infiltrating and solidifying the crack to seal the crack, and repairing a leaked portion. It is in. (2) When a crack occurs in the cooling pipe of the stave cooler for cooling the blast furnace furnace body, the cooling water to the cooling pipe is cut off and emptied, and then a liquid sealant is filled into the pipe to penetrate the crack. In the method of repairing a furnace body cooling device for a blast furnace, the liquid type sealant is removed after the solidified material is solidified, the crack is sealed, and the leaked portion is repaired. (3) A method for repairing a furnace body cooling device for a blast furnace, which is characterized in that cooling water containing a liquid-type sealant is always supplied to the cooling water of the stave cooler for cooling the blast furnace body.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is based on the idea of utilizing a damaged cooling pipe of a stave cooler for cooling a blast furnace furnace body and maintaining the cooling effect at the same level as before the damage. As shown in FIG. 2, the stave cooler for cooling the furnace body of the blast furnace has a structure in which a cooling pipe is cast and embedded, and refractory bricks are arranged inside the furnace. The cooling pipe is provided with a plurality of supply ports and discharge ports, and cooling water can be independently supplied to each cooling pipe.

As shown in FIG. 1, the blast furnace furnace body is cooled by a large number of stave coolers arranged in the furnace.
The cooling pipe in the stave cooler for cooling the furnace body of the blast furnace is affected by thermal deformation of the stave cooler body due to fluctuations in heat load from the inside of the furnace, and cracks occur and are damaged. Alternatively, excessive heat load causes melting and damage.

In the present invention, the cooling pipe is damaged due to a crack of about 1 mm or less, and by using a liquid sealant, only the cracked portion is sealed to repair the damaged cooling pipe. is there. As a result, the contact between the cooling pipe and the cooling water is directly maintained except for the cracked portion, and there is no change from before, and the cooling effect of the stave cooler can be maintained as it is.

The liquid sealant used for repairing the cooling pipe of the stave cooler is a base material mainly composed of synthetic resin or synthetic rubber dissolved in a solvent, and after penetrating into cracks, the solvent dries and evaporates. By virtue of this, a viscoelastic or fixed type substance is formed inside the crack to exert sealing performance.

The first repair method of the present invention is a method applied to a case where a large number of damages occur in the cooling pipe of the stave cooler for cooling the blast furnace body, and a liquid type sealant which is easily soluble in the entire circulating cooling water. It is a form of injecting and totally repairing. The second repair method of the present invention is a method applied when the number of damages to the cooling pipe is local and is a form in which only the damaged cooling pipe is repaired independently. The present invention third
The repair method of (1) is a form in which the cooling water containing the liquid-based sealant is constantly flowed to prevent damage to the cooling pipe while preventing damage.

There is a method of repairing a liquid-cooling type internal combustion engine radiator with a liquid sealing agent to prevent water leakage, but since the water pipe of the radiator core is exposed, the sealing agent is easily washed away, and the temperature of the radiator is at most 100. Since it is as low as about ℃, the sealing performance of the sealant is low. Water leakage of the radiator is caused by the formation of pinholes due to corrosion of the water pipe. Even if the cooling water leaks to the atmosphere, if it is replenished appropriately, it will not impair the function of the internal combustion engine and the radiator can be easily replaced. .

On the other hand, water leakage of the cooling pipe in the stave cooler causes water to enter the blast furnace, which seriously impairs the production function of the blast furnace, and replacement of the stave cooler is not easy because the blast furnace operation is stopped. Absent. Since the cooling pipe of the stave cooler is embedded in the base material by casting, the sealing agent easily stays around the cracked part even if it flows out, and the cooling pipe temperature is as high as about 300 ° C. It can be used and reliable repaired.

[0014]

Embodiments of the present invention will be described in detail with reference to FIGS. FIG. 1 is a stave cooler system diagram for cooling a blast furnace body, and FIG. 2 is a longitudinal sectional view of the stave cooler. Although the cooling water circulates in the piping system of FIG. 1, cracks in the embedded cooling pipe 2 in the stave cooler 1 lower the water level of the drum 3 due to leakage of the cooling water into the furnace, or the piping system. It was detected by mixing the gas in the furnace into the furnace.

After the damage is found, for example, by using the chemical injection equipment 4 for improving the water quality, the easily soluble liquid sealant is injected into the piping system and circulated together with the cooling water to penetrate the cracked portion and solidify. To prevent cooling water from leaking. Alternatively, when the embedded cooling pipe 2 is damaged, the embedded cooling pipe 2 is separated from the cooling water supply / drainage pipe 5 and the cooling water in the cooling pipe is drained, and then the liquid sealing agent is filled in the pipe to penetrate into the cracked portion and solidify. After sealing by sealing, the excess sealant was removed, and the pipe 5 was connected again to allow cooling water to pass therethrough. Alternatively, the chemical injection facility 4 is used to constantly inject the liquid sealant into the piping system and circulate it together with the cooling water for preventive maintenance to avoid troubles due to damage to the cooling pipe.

[0016]

In the method for repairing the furnace body cooling device for a blast furnace of the present invention, since a liquid-based sealant is used, it is possible to seal only a damaged portion such as a crack, without impairing the cooling effect. Can be repaired.

[Brief description of drawings]

FIG. 1 is a diagram of a stave cooler system for cooling a blast furnace body in an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a stave cooler in an embodiment of the present invention.

[Explanation of symbols]

 1 Stave cooler 2 Embedded cooling pipe 3 Drum 4 Chemical injection equipment 5 Water supply / drainage pipe

Claims (3)

[Claims] 1. When a crack is generated in a cooling pipe of a stave cooler for cooling a blast furnace furnace body, an easily soluble liquid sealant is injected into cooling water to the cooling pipe, and the crack is penetrated into the crack to solidify it. A method for repairing a furnace body cooling device for a blast furnace, which comprises hermetically sealing and repairing a leak portion. 2. When a crack occurs in a cooling pipe of a stave cooler for cooling a blast furnace body, after cooling water to the cooling pipe is cut off and emptied, a liquid sealant is filled into the pipe to crack. A method for repairing a furnace cooling device for a blast furnace, wherein the liquid-based sealing agent is removed after the crack is sealed by infiltrating into and solidifying the crack to seal the crack. 3. A method for repairing a furnace body cooling device for a blast furnace, wherein cooling water containing a liquid sealant is always flowed through the cooling water of a stave cooler for cooling the blast furnace body.