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flame gunning process

A process and flame technology, which is applied in the field of overall spraying and repairing of steelmaking furnace lining in iron and steel companies, can solve problems such as high power of converter rotating motor, high cost per ton of steel, and large overall weight of steelmaking furnace, etc. Achieve the effects of improving steelmaking efficiency, improving corrosion resistance and erosion resistance, and achieving great economic benefits

Inactive Publication Date: 2014-10-29
NANTONG XINGSHI MATERIAL TRADING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem solved by the present invention is: the refractory inner lining of the steelmaking furnace is relatively thick (800mm-900mm), the overall weight of the steelmaking furnace is relatively large, and the power of the rotating motor of the converter is huge, resulting in the high cost per ton of steel; the problem solved by the present invention Another problem is that the steelmaking furnace needs to stop the furnace to cool down and implement destructive repair; the third problem solved by the present invention is the short service life of the steelmaking furnace

Method used

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Effect test

Embodiment 1

[0015] Flame gunning process, the method of integrally spraying the inner lining of steelmaking furnace is to follow the steps below:

[0016] (1) Preheating: Pour the refractory powder into the preheating material tank and heat it to 700°C-1500°C. During the heating process, the speed of the preheating material tank is 0-20 rpm;

[0017] (2) Overall spraying: connect the discharge port of the preheating material tank with the tail of the spray gun, and 2 , argon, C 2 h 2 The gas source is connected to the corresponding port at the end of the spray gun through a pipeline. According to the spraying operation rules - turn on O in turn 2 、C 2 h 2 After closing the valve, open the feeding valve again. use C 2 h 2 After leaving the focusing nozzle, the high-temperature 2500°C flame belt is about 1.5 meters long. After the refractory powder is fired into a molten state, the inner lining of the new steelmaking furnace is sprayed as a whole. After the spraying is completed, c...

Embodiment 2

[0019] The method of repairing the lining of the steelmaking furnace is to follow the steps below:

[0020] (1) Preheating: Pour the refractory powder into the preheating material tank and heat it to 700°C-1500°C. During the heating process, the speed of the preheating material tank is 0-20 rpm;

[0021] (2) pre-treatment of the lining of the steelmaking furnace: the discharge port of the preheating feed tank is connected with the tail of the spray gun, and the O 2 , argon, C 2 h 2 The gas source is connected to the corresponding port at the end of the spray gun through a pipeline. According to the repair operation procedure - turn on O in turn 2 、C 2 h 2 After the valve, use the high temperature of 2500°C at the focal point after acetylene leaves the focusing nozzle to first melt off a layer of slag on the surface of the steelmaking furnace lining that is eroded by molten steel, and then burn it out on the exposed refractory lining at the eroded portion Cross groove;

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Abstract

A flame gunning technique is a technique method for spraying and mending a lining of a steel refining furnace. The spraying method comprises the steps: heating fire-resistant powder in a material tank to 700-1500 DEG C at the material tank body rotation speed of 0-20 turns / min; connecting the discharge port of the material tank, O2, argon and C2H2 with the tail of a spray gun, and opening the O2, C2H2 and a discharging valve; and sintering the fire-resistant powder into a smelting state by utilizing a focused flame belt of 2500 DEG C, and then spraying. The mending method is basically identical to the operation of the spraying method and specially comprises the steps of: before opening the discharging valve, melting slag on the surface of a part corroded by molten steel by utilizing the focused high temperature of 2500 DEG C and then sintering a cross-shaped groove; and then opening the discharging valve for mending. The fire-resistant powder for flame gunning does not contain water, thus improving the density of a coating and anti-corrosion anti-scouring performance of the coating on molten steel, reducing the thickness of the lining and the motor power of a converter and further achieving the purpose of reducing the cost of each tonnage steels. The flame gunning technique solves the problems that the lining of the steel refining furnace is thick, the motor power of the converter is large and the steel refining furnace needs stopping for mending.

Description

technical field [0001] The invention relates to a process flow of overall spraying and repairing, in particular to a process flow of integral spraying and repairing of the steelmaking furnace inner lining of a steel company. Background technique [0002] The lining materials of steelmaking furnaces in steel companies are all refractory materials. Whether the inner lining is built brick by brick or poured as a whole, it contains water and adhesive. After drying, the space occupied by water and adhesive becomes pores, the porosity is high, the corrosion resistance and erosion resistance to molten steel are low, and the refractory lining needs to be relatively thick, with a thickness of 800mm to 900mm . In addition, the steel frame structure outside the steelmaking furnace is large, resulting in a relatively large overall weight of the steelmaking furnace, which makes the power of the converter rotating motor huge, and the cost per ton of steel remains high. After 300 to 400...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D1/16
Inventor 常君辰郭铁军
Owner NANTONG XINGSHI MATERIAL TRADING CO LTD
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