1 Furnace bottom sidewall gas spray gun
The spray gun blowing in argon and oxygen gas is installed at the air vent of the side wall at the bottom of the furnace. The spray gun is mostly a casing structure, the inner tube is made of copper to enter argon-oxygen mixed gas, and the outer tube is made of stainless steel to pass the cooling gas argon.
> gas spray gun working principle
(1) The cooling gas passes through the steel pipe and high-pressure leather pipe from the gas distribution package, enters the middle gap between the copper pipe and the stainless steel tube from the gun handle side, and enters the furnace.
(2) The main gas enters the furnace from the mixed gas package through the steel pipe and high-pressure leather tube from the front of the gun handle, and then through the copper tube. (3) When the working gas is stopped, the cooling gas enters the main gas pipeline through the secondary valve station, and the core tube can also be cooled.
The gas spray gun of the AOD furnace is generally installed in the air outlet brick on the side wall near the bottom of the furnace. The vast majority at the moment
The AOD furnace uses a gas-cooled consumption spray gun. The air outlet brick adopts high-quality combined with 60% magnesium chrome brick, and the outer casing pipe of the spray gun is closely matched with the air outlet brick, and the consumption rate in smelting is basically the same.
The number of > air outlets and spray guns increases with the capacity of the furnace, and the number of 180tAOD spray guns is 9, distributed in the range of 120 degrees.
2 guns
The auxiliary gun equipment is an effective tool for temperature measurement and sampling of molten steel in the case of uninterrupted blowing in the vertical state. Modern steelmaking technology relies on the measurement of secondary guns to adjust the amount of oxygen blown and the amount of converter raw material added. > The secondary gun system has the following main functions:
Automatic selection of the probe before measurement and connection to the gripper of the secondary gun probe;
The probe can measure the temperature at the end of the smelting, oxygen activity (measured only at the end of the blowing), sampling, and measure the blowing at the same time
Molten pool level;
The probe can measure the temperature of the smelting process, set carbon and sampling;
The sensor signal is transmitted to the signal processor, and then transmitted to the process computer by the PLC to realize automatic control; the result and quality code can be directly displayed on the workstation in the converter control room: the probe can be automatically removed from the auxiliary gun;
3 Gas valve station
The gas control system of AOD furnace includes: gas supply system, primary valve station, secondary valve station gas supply system
The gas medium is processed by the oxygen plant, and after confirmation, it is sent to the gas unit by pipeline for storage, namely: 02.
Ar, N2 input is 200m3, 120m3 three balls respectively (the maximum allowable pressure in the strands is 3.0Mpa)
> primary valve station
The supply of AOD furnace 02, Ar, N2 smelting gas, composed of three balls, pipeline, valve and pressure reducing valve. elapse
Once the valve station reduces the pressure, the pressure is adjusted according to the output pressure, namely: 02 1.4, Ar, N21.6Mpaa
> the role and operation of the secondary valve station
The secondary valve station is to further depressurize and adjust the 02, Ar, N2 gas source after the primary decompression, and according to the process specification
The process requires gas proportioning. It is fed into the furnace by the gas mixture package for blowing. It must be checked before oxygen, argon, and hydrogen air
Whether each shut-off valve is in a closed state, if it is not closed, check whether the shut-off valve of the operation room is in the closed position, open the secondary valve station after confirmation, the first shut-off valve, should slowly rotate the valve when opening, it is strictly forbidden to open quickly, especially when sending oxygen should absolutely operate in accordance with the above regulations.
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