CN112325653B

CN112325653B - Repairing method of metal mixer lining

Info

Publication number: CN112325653B
Application number: CN202011040357.4A
Authority: CN
Inventors: 陈亚团; 张俊同; 朱青德; 任文卓; 李金钢
Original assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Current assignee: Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2022-09-20
Anticipated expiration: 2040-09-28
Also published as: CN112325653A

Abstract

The invention provides a method for repairing a blast furnace mixer lining, relates to the technical field of metallurgy, and solves the problems of high repair cost and low repair quality of enterprises for the blast furnace mixer lining. The method comprises the steps of determining the part to be gunned by adopting a mode of combining human eye observation and temperature measurement of a temperature measuring gun; the furnace of the mixer is shaken to an angle convenient for spray repair, and the furnace is shut down; filling spray materials mixed according to a certain proportion into a spray repair tank; spray-repairing the part to be spray-repaired; comprises the steps of sintering, sintering treatment for measuring temperature and the like. By adopting the technical scheme of the invention, the effects of reducing the cost and ensuring the repairing quality are achieved.

Description

Repairing method of metal mixer lining

Technical Field

The invention relates to the technical field of metallurgy, in particular to a method for repairing a lining of a mixer furnace.

Background

Whether brick lining, monolithic knotted lining or composite lining, low cost and long life are sought for manufacturing enterprises. The blast furnace mixer furnace lining bears the dynamic load in the processes of gravity scouring of molten iron and iron slag, erosion of the iron slag, hot air flow scouring and tilting, bears the thermal shock action of the disturbance of the molten iron and corresponding temperature fluctuation in the iron feeding and discharging process, and bears the thermal shock action of the corresponding temperature fluctuation in the gas stopping period of cleaning the top of the blast furnace mixer furnace and the maintenance period of a gas system.

The furnace top is made of casting material/brick with low creep deformation and micro expansion (good thermal shock resistance) as matrix, the heat insulating layer of the furnace top usually adopts light clay brick to replace asbestos board and fibrofelt, and the working layer is knotted; the furnace bottom is made of castable/bricks with high refractoriness under load and high-temperature strength; the part of the molten iron slag line bears airflow scouring, temperature shock, slag erosion and molten iron scouring, the corner part of the front wall of the mixer furnace bears airflow scouring, temperature shock, slag erosion and molten iron scouring, the operation environment is relatively severe, the grade of selected materials is relatively higher, and especially the corner part of the front wall of the bricklaying mixer furnace has tighter requirements on brick material and construction (the damage condition of the part of the bricklaying mixer furnace determines the service life of the furnace lining). The rear wall and the middle position of the inner lining of the metal mixer are locally thickened properly, which is beneficial to prolonging the service life of the lining of the top-charging metal mixer.

At present, the condition in the industry is that when the temperature of a bricklaying furnace lining in a furnace shell of a mixer furnace exceeds 220 ℃ or the temperature of an integrally knotted furnace lining exceeds 250 ℃, spray repair is adopted to maintain the high temperature point of the mixer furnace. Because the mixed iron furnace lining is originally in a knotting or masonry mode, the structure is compact, and the iron slag is adhered to the surface of the furnace lining in the long-term operation process, so that a special sintered layer formed by the original refractory and the iron slag is formed. Due to the structural particularity of the mixer, except for the furnace bottom, other parts of the furnace lining cannot adopt a self-flowing cold-state furnace repairing material mode like a converter, and the main means of repairing is a spray repairing mode of three-phase mixed jet flow of material, water and gas. The gunning material is powder, compressed air and water are adopted as carriers to be sprayed and attached to the surface of the furnace lining, the compactness, the components, the linear expansion degree, the refractoriness and other physical and chemical properties of the gunning material are originally different from those of the furnace lining, and if the gunning and sintering operations are not reasonable, the effect obtained by the gunning is not obvious. In the actual production, the phenomena of poor quality and poor quality exist in the blast furnace mixer in a large quantity. The general practice of enterprises at present is to adopt coal gas baking after spray repair, then put into operation, often bake inadequately, mend the maintenance quality unsatisfactory: the service time after the furnace repairing is not long, the material falling problem exists, the spray repairing frequency needs to be increased, and the furnace repairing cost is high; finally, the effect of smooth production is not achieved, and production organization optimization and cost reduction are influenced due to the fact that the furnace lining is in continuous failure.

Disclosure of Invention

Based on the technical problems, the invention provides a method for repairing the inner liner of the metal mixer, which solves the problems of high repair cost and low repair quality of the inner liner of the metal mixer in enterprises.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a repairing method of a blast furnace mixer lining comprises the following steps:

a: and determining the spray repair part.

b: and (5) stopping the furnace when the power is off and shaking the furnace to an angle convenient for spray repair.

c: and filling spray materials into the spray repair tank.

d: and (5) spray repair.

e: and (5) sintering treatment.

Furthermore, in the step a, the position to be gunned is determined by combining the observation of the peephole and the iron notch on the furnace top and the temperature measurement of the steel shell outside the furnace by adopting a laser temperature measuring gun. The method can accurately determine the part to be repaired without the intervention of complex equipment, thereby reducing the cost of the early stage of repair.

Further, in the step c, the gunning material comprises gunning material and water, the gunning material comprises gunning raw material, steel-tapping hole repairing material, pyrophosphate and phosphate fertilizer, the ratio of the gunning material to the water is 50:10:1:1, and the ratio of the gunning material to the water is 3: 1. The additives such as the steel-tapping hole repairing material, pyrophosphoric acid and phosphate fertilizer are added into the gunning material at a low proportion, so that the viscosity of the mixed material, water and gas is high, the adhesive capacity during gunning is increased, the negative influence caused by the difference of the physical and chemical properties of the gunning material and the furnace lining is weakened, the close combination of the gunning material and the collective refractory material is preliminarily ensured before the gunning part is sintered subsequently, and the gunning quality is improved.

Furthermore, in the step d, the device adopted by the spray repair is a spray gun, during the spray repair, the spray gun moves back and forth in front of the part to be spray repaired, and the distance between the spray gun opening of the spray gun and the part to be spray repaired is kept between 0.5 and 0.7 meter.

Further, step e includes the following steps:

e1, sintering the lining of the mixer furnace for 1.5-2 hours by adopting a gas flame sintering mode, and then carrying out first temperature measurement on the spray repair part and organizing 50 tons of first iron feeding.

e2, measuring the temperature of the spray repair part for the second time, if the temperature difference of the temperature measurement of the previous two times is more than 20 ℃, returning to the fourth step to carry out spray repair again, if the temperature difference of the temperature measurement of the previous two times is less than 20 ℃, sintering the spray repair part for half an hour by adopting the iron slag radiation heat sintering mode, measuring the temperature for the third time, organizing 50 tons of iron to be fed for the second time, and measuring the temperature for the fourth time.

e3, organizing 100 tons of iron after sintering for half an hour by adopting an iron slag radiant heat sintering mode, then carrying out fifth temperature measurement, returning to the step four for carrying out gunning again if the difference between the fifth temperature measurement carried out on the gunning part and other parts on the same horizontal line is more than 10 ℃, and if the difference is less than 10 ℃, achieving the repair standard.

e4, performing multiple iron feeding sintering.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

the invention provides a repairing method of a mixer lining, which can reliably determine the part to be repaired by combining in-furnace observation and laser temperature measurement without intervention of complex equipment, and can improve the spray repair quality, reduce the spray repair frequency and reduce the repair cost by using the additive and other mixture spray materials; the method adopts a mode of combining gas flame sintering, iron slag radiant heat sintering before soaking and iron slag conduction heat sintering after immersion to carry out sintering, and carries out repeated iron feeding and tapping and intensive temperature measurement according to the temperature measurement condition to carry out repairing, so that the whole repairing process is gradual, precise and reliable, and the repairing quality is ensured through high-quality sintering after spray repairing.

Drawings

FIG. 1 is a schematic flow chart of the present invention.

FIG. 2 is a flow chart of an embodiment of the present invention.

Detailed Description

The present application will now be described in detail with reference to the accompanying drawings.

Examples

Please refer to fig. 1 and fig. 2. Firstly, determining a part to be gunned in the inner lining of the metal mixer. The staff artificially observes the furnace through the peephole and the iron receiving opening at the furnace top, and the part with the color deeper than other parts in the furnace is observed as a loss part; and then measuring the temperature of the steel shell outside the furnace by using a laser temperature measuring gun, wherein the part with high temperature is the part to be gunned. The method can accurately determine the part to be repaired without the intervention of complex equipment, thereby reducing the cost of the early stage of repair.

And next, rocking the mixer to an angle convenient for gunning, and then cutting off the power and stopping the furnace. And then, mixing the gunning raw materials, the steel tapping hole mending material, the pyrophosphate powder and the phosphate fertilizer in a ratio of 50:10:1: the ratio of 1 is mixed into gunning mix, then the gunning mix and water are mixed into gunning mix in a ratio of 3:1 in a gunning tank, additives such as a steel tapping hole repairing mix, pyrophosphoric acid and phosphatic fertilizer are added into the gunning mix in a low ratio, the viscosity of the gunning mix after the materials, the water and the gas are mixed is large, the adhesive capacity during gunning is increased, meanwhile, the negative influence caused by the difference of the physical and chemical properties of a furnace lining is weakened, the close combination of the gunning mix and a collective refractory material is preliminarily guaranteed before the gunning part is sintered subsequently, and therefore the gunning quality is improved.

And then, spray repair operation is carried out by using a spray repair tank, spray materials are sprayed out of the spray gun, workers need to move back and forth when holding the spray gun by hands and cannot stay at one point for a long time, the materials are sprayed again only after the materials are sprayed at the same position and turn dark red, a small amount of thin layers are overlapped for many times, and meanwhile, the distance between a spray gun opening and the position to be sprayed and repaired needs to be kept at 0.5-0.7 m as far as possible.

And then sintering the gunned mixer. Firstly sintering the lining of a blast furnace mixer for 1.5-2 hours by adopting a gas flame sintering mode, carrying out first temperature measurement on a spray repair part and organizing 50 tons of iron feeding for the first time, then carrying out second temperature measurement on the spray repair part, carrying out spray repair operation again if the temperature difference of the temperature measurement of the first two times is more than 20 ℃, sintering the spray repair part for half an hour by adopting an iron slag radiation heat sintering mode and carrying out third temperature measurement if the temperature difference of the temperature measurement of the first two times is less than 20 ℃, organizing 50 tons of iron feeding for the second time, carrying out fourth temperature measurement, organizing 100 tons of iron discharging after sintering for half an hour by adopting the iron slag radiation heat sintering mode, carrying out fifth temperature measurement, carrying out spray repair operation again if the difference of the fifth temperature measurement on the spray repair part and other parts on the same horizontal line is more than 10 ℃, and achieving the normal use standard if the difference is less than 10 ℃, but the iron slag conduction heat sintering mode is adopted to carry out iron feeding sintering for 50 tons for many times, so that the difference of physical and chemical properties of the spray repair part can be further eliminated, the close combination of the spray material and the collective refractory material is further ensured, and the repair quality is improved.

In the above technical solution, it should be noted that the iron feeding process cannot submerge the spray-repairing part for the first time after the spray-repairing process, and gradually submerges the spray-repairing part for the second time and later.

Claims

1. The repairing method of the inner liner of the mixer furnace is characterized by comprising the following steps:

a: determining a part to be gunned;

b: the furnace of the mixer is shaken to an angle convenient for spray repair, and the furnace is shut down;

c: filling spray materials into the spray repair tank;

d: spray-repairing the part to be spray-repaired;

e: sintering treatment;

in the step e, the sintering treatment comprises the following steps:

e1, sintering the lining of the mixer furnace for 1.5-2 hours by adopting a gas flame sintering mode, and then carrying out first temperature measurement on the spray repair part and organizing 50 tons of first iron feeding;

e2, measuring the temperature of the spray repair part for the second time, if the temperature difference of the temperature measurement of the first two times is more than 20 ℃, returning to the fourth step to carry out spray repair again, if the temperature difference of the temperature measurement of the first two times is less than 20 ℃, sintering the spray repair part for half an hour by adopting the iron slag radiation heat sintering mode, measuring the temperature for the third time, organizing 50 tons of iron to be fed for the second time, and measuring the temperature for the fourth time;

e3, organizing 100 tons of iron after sintering for half an hour by adopting an iron slag radiant heat sintering mode, then carrying out fifth temperature measurement, returning to the step four for carrying out re-spray repair if the difference between the fifth temperature measurement carried out on the spray repair part and other parts on the same horizontal line is more than 10 ℃, and if the difference is less than 10 ℃, achieving the repair standard;

e4, performing multiple iron feeding sintering.

2. The method for repairing the lining of the mixer furnace as claimed in claim 1, wherein in the step a, the position to be gunned is determined by combining observation of the peephole and the iron-receiving port of the furnace top with temperature measurement of the steel shell outside the furnace by using a laser temperature measuring gun.

3. The method for repairing an inner liner of a mixer furnace as claimed in claim 1, wherein in the step c, the gunning material comprises gunning material and water, the gunning material comprises gunning raw material, tap hole repairing material, coke powder and phosphate fertilizer, and the ratio of the gunning material to the water is 50:10:1:1, and the ratio of the gunning material to the water is 3: 1.

4. The method as claimed in claim 1, wherein the gunning is performed by a lance comprising a nozzle, the lance is moved back and forth in front of the portion to be gunned during gunning, and the distance between the nozzle and the portion to be gunned is maintained at 0.5-0.7 m.