3000kva ferroalloys refining furnace technical proposal and supply scope (micro-low carbon fecr)
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3000KVA Ferroalloys Refining Furnace
Technical Proposal and Supply Scope
<Low/Micro Carbon Ferrochrome>
Contact：Guo ke/郭 珂Email: [email protected]
Skype: guoke896884090 Mobile：+86 13299042234
Professional:
Submerged Arc Furnace and chain equipments, Blast Furnace and chain equipments, Electric Arc Furnace, Induction Furnace, Refractory Materials, Ferroalloys, Ores Metals and etc.,
Guo ke +86 132 9904 2234 [email protected]
General introduction The 3000KVA ferroalloy refining furnace, which adopts electro - silicothermic
process as its major method, are mainly used for ferroalloys, like FeMn, FeNi and low carbon ferrochrome smelting. Here take low carbon ferrochrome as example:
I. Electro-Silicothermic Process for Low/Micro Carbon Ferrochrome
1) Raw materials
Chrome ore, SiCr alloy and lime are use as raw materials.
2) Reaction
The reaction formulas are show in following:
2Cr2O3+3Si=4Cr＋3SiO2
2FeO+Si=2Fe+SiO2
3) Operation technology
Low carbon ferrochrome production is intermittent operation, with different
electrics through each smelting phase, as 260-290V in general melting and 150-170V
during refining phase.
SiCr alloy is used as reducing agent in smelting.
To prevent arc erosion and suitable for power transmission, there should be
150~200mm liquid remains in bottom of furnace.
There are two materials feeding method adopted in smelting: one is mixed
feeding, that is chrome ore, lime and SiCr alloy are mixed together and put into
furnace together; another is batch feeding, namely to mix the raw materials together
and put into furnace in several times. This is the melting period.
Refining period defines from total melting of materials to taping. Complete
stirring needed in order to promote reduction reaction in this period.
Sampling will make from central point of three electrodes before taping for Si
content judge and adjustment. Add SiCr alloy or Cr ore to fulfill qualified
compositions before taping.
The liquid will cast into mould after deslagging, and then surface cleaning,
granulated, and packed.
4) Ingredients
Raw materials chemical compositions:
Chrome ore:
Cr2O345%，FeO23%，SiO25%，Al2O313%，CaO2%，MgO8%，C0.03%，P0.
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03%
SiCr alloy: Cr28%，Si48%，Fe23%，C0.5%，P0.02%
Lime:
FeO0.5%，SiO21%，Al2O35%，CaO80%，MgO1%，C0.03%，P0.03%
Unit consists of ingredients:
100kg Cr ore, 84kg lime, 40kg SiCr alloy
Unit consumption of materials:
Chrome ore/ (kg/t) 1500-1600
SiCr alloy/ (kg/t) 620-640
Lime / (kg/t) 1350-1500
Mg brick/ (kg/t) 30-40
Electrode / (kg/t) 30-40
Power consumption/ (kW·h/t) 2000-2400
Ⅱ.Equipment technical parameters
Furnace top feeding method is applied in the refining furnace.
Major parameters of furnace
1) Furnace
Furnace shell diameter: φ4000mm
Furnace shell height: 2600mm
2) Tilting device
Taping dip (max): 25°/-5°
3) Electrode lifting
Graphite electrode diameter: φ300mm
Electrode central circle: φ1100mm±50mm
Electrode Max Strike: 2000mm
Electrode upward speed: 2m/min
Electrode downward speed: 1.5m/min
Electrode lifting adjustment: Proportional valve control
4) Hydraulic system
Working pressure: 8-10MPa
Working medium: H2O-ethylene glycol
5) Transformer
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Rated capacity: 3000KVA
Primary voltage: 33KV
Secondary voltage: 299-286-273-260-190-175-160-145V
Voltage mode: 7-speed load tap (constant power)
Secondary rated current: 11945A
Secondary terminals & outlet: top outlet
Cooling method: OFWF
6) Conductor unbalanced coefficient: ≤5%
7) Cooling Water System
Inlet pressure: open 0.2MPa
Inlet temperature: ≤35℃Outlet temperature: ≤55℃Water consumption: ～200m3/h
Water quality: general purified industrial water
Ⅲ. Major technical parameters
3.1 Mechanical introductions
1) Furnace body
Consists of furnace shell, troughs and etc
4000mm diameter furnace shell welded by 20mm thickness 16Mn steel plate,
applied with refractory materials lining, which is fixed by angle pin together with
tilting platform.
2) Furnace cover is fixed type with gas hood, installed in 2nd platform layer. With
diameter of 4600mm and 1200mm height, there are 5 manual operating doors around.
Water cooling systems equipped in the top of furnace cover, along with three
materials charging holes and the 4th dedusting hole. There are totally three electrode
holes on the top.
3) Tilting device is consists by rail, oil cylinder, curved frame, tilting platform
and etc.
4) Electrode lifting
Consists by oil cylinder, lifting column, guide roller, electrode arm, insulation
components and etc
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5) Electrode guide frame
6) Hydraulic system
Functioning pressure is 10MPa, and use water - ethylene glycol.
7) Water cooling system
8) Conductors
9) Materials charging
Totally 5 materials cabinets with 2m3 volume
3.2 Electrics
1) High voltage
Primary voltage is 33KV, with GBC-40.5 cabinet.
2) Transformer
Rated capacity: 3000KVA
Primary voltage: 33KV
Secondary voltage: 299-286-273-260-190-175-160-145V
Voltage adjustment: 7 grades, loaded
Secondary rated current: 11945A
Cooling: OFWF
3) Low voltage
Mainly consists by power supply, electric control and electrode adjustor.
Technical index of PLC electrode adjustor:
Electrode lifting max speed: 2m/min rise speed; 1.5m/min drop speed
Electrode lifting response time: start ≤0.15S; brake≤0.1S
4) Automation system
Ⅳ. Major equipment and structures
For a 3000KVA refining furnace mainly include the following equipment and
structures:
No.No. NameName QtyQty RRemarksemarks
11 Furnace coverFurnace cover 1set1set
22 Furnace bodyFurnace body 1set1set
33 Electrode armElectrode arm 1set1set
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44 Lifting volumeLifting volume 1set1set
55 Tilting deviceTilting device 1set1set
66 Hydraulics Hydraulics 1set1set
77 ConductorConductor 1set1set
88 Water coolingWater cooling 1set1set99 Materials ChargingMaterials Charging 1 set1 set1010 IIngredients systemngredients system 1 set1 set1111 MMaterial tankaterial tank 2 set2 set1212 SSling ling 2 set2 set1313 LLadleadle 4 set4 set1414 CCasting plateasting plate 1 set1 set1515 TTap ap vehiclevehicle 1 set1 set1616 CCart art 1 set1 set1717 HHammer crusherammer crusher 1 set1 set
1818 TTransformer ransformer 1 set1 set
1919 HV cabinetHV cabinet 1 set1 set
2020 LV electric controlLV electric control 1 set1 set
2121 AAutomationutomation 1 set1 set
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