LF炉温度控制曲线

LF炉温度控制曲线
LF Furnace temperature control curve
二．LF钢包精炼炉工艺流程及作业周期（min）
Second. LF Ladle refining furnace process and operation cycle(min)
1 工艺流程图
1 Process flow diagram
2 作业周期（min）
2 Operation cycle (min)
三．LF-90t精炼炉工艺操作描述
Third. LF-90t Finer furnace process operation description
1 LF炉精炼阶段
1LF Furnace refining stage
电弧炉出钢，根据生产工艺确定精炼包钢水装入量，通过冶炼浇铸跨行车吊包座包于90tLF炉钢包车上，人工接通氩气管，钢包车载包运行至加热工位（定
位精度±5mm），水冷炉盖下降封闭钢包，三相电极下降，送电加热。

送电过程中使用正常的吹氩氩量进行搅拌，通过加料系统补加渣料。

由于热平衡，送电初期钢液温度继续下降，3～4min开始升温。

精炼期加还原剂还原，分批加入，少批量，多批次撒匀。

同时将试样速送至化验室进行快速分析。

Arc furnace tapping, according to the production process to identify refining steel water loading, through smelting casting crane packets packets to cross 90tLF furnace steel car, artificial trachea on argon ladle car package, running to the heating station ( positioning accuracy of 5mm ), water-cooling furnace cover sealing ladle drop, three-phase electrode decreases, send electric heating. Transmission process using normal argon blowing argon stirring volume, by adding slag material feeding system. The heat balance of power transmission, initial temperature of molten steel continued to decline, 3 ~ 4min began to heat up. Refining period is reduced by adding reducing agent, batch addition, little batch, batch sprinkle. At the same time samples will be sent to the laboratory for rapid analysis speed.
根据化验分析值与钢种目标值之间的差值，计算出需要加入合金的种类和物料质量，在规定时间内将规定牌号和数量的合金料经称量送至LF炉受料斗，启动受料斗闸门，合金料即可加入钢包，达到合金调整之目的。

第二阶段送电还原后停电，测温、取样，合金成分进入钢种规格后，然后调整电压、电流保温，测温，温度达到要求，喂CaSi丝，终脱[O]，脱[S]，以改变氧化物、硫化物的形态和分布。

喂丝速度在喂丝机上按工艺要求设定，喂丝机控制柜上设有显示喂入长度的计数器和速度控制器，以一定速度加入至预定长度后会自动停止喂丝，此阶段采用较小的吹氩量进行“软吹”。

[S]进入规格，可根据需要微调个别合金元素，升电极，提起水冷炉盖。

According to the analysis of value and the difference between the steel target value, calculates the need to join the alloy type and material quality, in the specified time will be stipulated and quantity of alloy material by weighting sent to LF furnace hopper, started receiving hopper gate, alloy material can be added to steel, alloy adjustment purposes. Second phase
power transmission reduction after the blackout, temperature measurement, sampling, alloy composition into the steel specifications, and then adjust the voltage, current insulation, temperature measurement, temperature reaches the request, CaSi wire feeding, end off [O], and [S ], to change the oxide, sulfide morphology and distribution. Wire feeding speed in wire feeding machine according to the requirement of process setting, wire feeding machine control cabinet is provided with a display of feeding length counter and a speed controller, at certain speed to join to a predetermined length will automatically stop feeding, this stage by using a smaller amount of" soft blowing argon blowing". [ S] into the specifications, according to the need to fine-tune the individual alloying elements, or electrode, mentions the water-cooling furnace cover.
2 开出加热工位至后处理工序阶段
2 Open the heating station to post-treatment process stages
钢包车开出加热工位至后处理工序，至此LF炉一个冶炼周期完成。

Buggy ladle move out of heating station to post processing process,
thus a complete LF furnace smelting cycle.
四．主要技术参数
Fourth.Main technical parameters
序号名称数值备注
S.N. Name Numerical Note
1 额定容量80t
Rated capacity 80t
平均钢水容量80t
Average molten steel capacity 80t
精炼最小钢水容量70t
Minimum capacity of refining molten steel 70t
最大钢水容量90t
The maximum capacity of molten steel 90t
2 钢包
2 Ladle
包壳上口直径Φ3200mm
Shell opening diameter Φ3200mm
自由空间高度800mm
Free space height 800mm
3 钢包车
3 Buggy ladle
最大承载200t
Maximum load 200t
行走速度2-25m/min（可调）
Walking speed 2-25m/min（adjustable）
驱动方式机械式，电机-减速器
Drive mode Mechanical type, motor reducer
轨道中心距3500mm
Center distance of the track 3500mm
调速方式变频调速
Speed control mode Variable frequency speed regulation
停车定位精度±5mm
Parking positioning accuracy ±5mm
4 电极升降装置
4 Electrode lifting devices
电极直径Φ450mm 高功率电极
Electrode diameter Φ450mm High power electrode
电极分布园Φ740mm
Electrode distribution garden Φ740mm
电极最大行程2800mm
Electrode biggest travel 2800mm
电极升降速度
Electrode lifting speed
自动5/3.6m/min 上升/下降
Auto 5/3.6m/min up/down
手动：6／4.5 m/min 上升/下降
Manual 6／4.5 m/min up/down
5 短网
5 Shortnet
阻抗绝对值 2.4mΩ
Impedance absolute value 2.4mΩ
三相阻抗不平衡≤4%（静态）
Three-phase impedance imbalance ≤4%（Static）
水冷电缆4200mm2共六根每相两根
Water-cooled cable 4200mm2 A total of six roots ,per phase two
6 水冷炉盖密排管式水冷炉盖，附集烟罩
6 Water cooled furnace lid Dense row of pipe type water-cooling furnace cover, with a smoke cover
烟气排放量200000Nm3/h (混风后烟气温度<500℃) Flue gas emissions 200000Nm3/h The flue gas temperature mixed with wind is less than 500 ℃
7 桥架及炉盖提升装置
7 Bridge shelf and furnace cover ascension device
提升高度400mm
lift height 400mm
提升方式液压缸+重载板式链
The way to improve Hydraulic cylinder + heavy plate chain
升降速度30~40mm/s
Lifting speed 30~40mm/s
8 电极接长站
8 Electrode joins long standing
规格Ф450mm
Specifications Ф450mm
工作方式电极自重夹紧（手动操作）
Mode of operation Electrode self-respect clamping (manual)
9 氩气系统
9 Argon system
氩气供气压力 1.6MPa(氩气汇流排入口压力)
Argon gas supply pressure 1.6MPa(argon converge-wires inlet pressure)
氩气工作压力0.2~0.8MPa(钢包入口压力)
Argon work pressure 0.2~0.8MPa(Ladle inlet pressure )
氩气耗量
Argon consumption
最大600Nl/min
Maximum 600Nl/min
通常50～150Nl/min
Usual 50～150Nl/min
事故状态氩气压力 1.6MPa
In accident state argon gas pressure 1.6MPa
10 压缩空气系统(动力用气)
10 Compressed air system (use gas)
压力≥0.4MPa
Pressure ≥0.4MPa
耗量10Nm3/h
Consumption 10Nm3/h
11 LF炉冷却水装置
11 LF Furnace cooling water unit
进水温度≤35℃
Inlet water temperature ≤35℃
回水温度≤55℃
Return water temperature ≤55℃
进水压力0.3～0.5MPa 无压回水Inlet water pressure 0.3～0.5MPa No pressure return water
耗量：水冷炉盖130 m3/h 无压回水Consumption: Water cooling furnace cover 130 m3/h No
pressure return water
设备本体耗量120 m3/h 无压回水Equipment ontology consumption 120 m3/h No pressure return water
变压器冷却水40 m3/h 无压回水Transformer cooling water 40 m3/h No pressure return water
液压站冷却水10 m3/h 无压回水Hydraulic pressure station cooling water 10 m3/h No pressure return water
事故应急水100 m3/h 0.2MPa，持续30min Accident emergency water 100 m3/h 0.2MPa，continue 30min
12 液压系统
12 Hydraulic system
工作压力12MPa
Work pressure 12MPa
工作介质水－乙二醇
Working medium water-glycol
13 精炼炉变压器
13 Finer furnace transformer
额定容量16000kVA 可长期过载20% Rated capacity 16000kVA allow long-term overload 20%
一次电压35kV
Primary voltage 35kV
二次电压330～280～190 V
Secondary voltage330～280～190 V
11级有载电动调压
11 stage load electric voltage regulating
二次电流36926A
Secondary current 36926A
14 钢包烘烤终点温度≥1000℃
14 Ladle heating end temperature ≥1000℃
15 钢水平均升温速度≥4.5℃/min
15 Average temperature raise velocity of molten steel ≥4.5℃/min。