A, high carbon chromium iron brand
| category |
Brand number |
chemical component |
| |
|
Cr |
C |
Si |
P |
S |
| |
|
|
/ |
£ |
| High carbon chromium iron |
FeCr67C6.0 |
62.~72.0 |
|
|
6.0 |
3.0 |
|
0.03 |
|
0.04 |
0.06 |
| |
FeCr55C600 |
|
60.0 |
52.0 |
6.0 |
3.0 |
5.0 |
0.04 |
0.06 |
0.04 |
0.06 |
| |
FeCr67C9.5 |
62.~72.0 |
|
|
9.5 |
3.0 |
|
0.03 |
|
0.04 |
0.06 |
| |
FeCr55C1000 |
|
60.0 |
52.0 |
10.0 |
3.0 |
5.0 |
0.04 |
0.06 |
0.04 |
0.06 |
B.Raw material requirements
1.Chrome ore
| granularity mm |
chemical component |
| Cr2O3 |
Cr2O3/∑FeO |
P |
S |
MgO |
Al2O3 |
| ≥ |
≤ |
| 10~70 |
50 |
2.5 |
0.07 |
0.05 |
The content should not be higher than |
The content should not be higher than |
2.coke
| granularity mm |
chemical component |
| C |
Composition of ash
|
S |
| ≥ |
≤ |
| 3~20 |
84 |
15 |
0.6 |
3.Silica stone
| granularity mm |
chemical component |
| SiO2 |
Al2O3 |
Thermal stability |
Dirt |
| ≥ |
≤ |
| 20~80 |
97 |
1 |
|
|
C. Technical and economic indicators
| NO |
ITEM |
unit |
quantity |
Remarks |
| 1 |
chrome ore |
kg / t |
1800~2000 |
Cr2O3>40% |
| 2 |
silica |
kg / t |
80~130 |
SO2>97% |
| 3 |
coke |
kg / t |
400~500 |
C>84% |
| 4 |
electrode paste |
kg / t |
20~30 |
|
| 5 |
casing of electrode |
kg / t |
2~3 |
|
| 6 |
rolled steel |
kg / t |
2~3 |
|
| 7 |
Ingot mould and slag tank |
kg / t |
8~10 |
|
| 8 |
refractory matter |
kg / t |
15~20 |
|
| 9 |
power consumption |
kW·h / t |
2800~3200 |
|
| 10 |
Recovery of chromium |
% |
≥91 |
|
| 11 |
slag rate |
kg / t |
1000~1800 |
|
Iv. Theoretical output calculation Q=H·Cosφ·Ps·k1·k2·k3÷W =24×0.88×12500×0.98×1×0.95÷3000 ≈82t/d Maximum daily output 98t /d annual output 27060 ~ 32340t
Q -- Daily output of electric furnace (t/ d)
H ---- Daily production time (24h/d)
Cosφ -- power factor of electric furnace, 0.88
PS ---- rated power of electric furnace (12500KVA) K1 -- power supply fluctuation coefficient (primary voltage), K1=0.98
K2 -- transformer power utilization coefficient, K2=1 K3 -- time utilization coefficient (operating rate), K3=0.95
W -- Power consumption of high-carbon ferrochrome products, W=3000 KWh
Process Description:
Chromium ore, silica, coke and other qualified raw materials are transported into the factory by the truck through the loadometer, respectively stored in the corresponding raw material yard, with a loader to load all kinds of raw materials into the compounding bin, all kinds of raw materials according to the requirements of the smelting formula, and fall to the mixing belt machine, and then transported to the main plant with a large inclination belt machine on the three floor platform, through the rail type cloth car added to the top bin.
The charge enters the semi-closed high-carbon ferrochrome furnace through the feeding tube, and the 33KV power supply is led into the furnace by the transformer through the three-phase electrode. The electrode generates arc heat between the charge and the charge and is transmitted to the furnace filled with the charge. Through arc heat and resistance heat, the mixture of chromium ore, silica and coke can be reduced to high-carbon ferrochrome. In the whole smelting process, the voltage level and current intensity on the electrode are set according to the smelting process parameters, and the voltage and current values are different in different periods, that is, the power input into the furnace is different. The electrode is always stably inserted in the charge in the furnace, and the gas is uniformly released from the whole charge surface. The arc is not exposed from beginning to end, and the mixed charge is added into the furnace in small batches with the decline of the material surface, so that the material surface in the furnace remains at a certain height, and the electrode around it presents a flat cone shape. When the molten iron generated by the reduction of high carbon ferrochrome in the furnace is stored to a certain extent, the hanging type gambling eye machine is used to open the furnace eye, and the molten iron and slag are released. The upper slag liquid flows to the side of the yellow sand pit, and is transported by the loader after cooling. The high carbon ferrochrome alloy liquid at the bottom of the calming basin flows into the two ingot molds at the back, and after a little cooling, it is pryed up and transported to the finishing area by driving or loading machine into the alloy box. Electric furnace in the prescribed power supply system, the average interval of 3 hours of iron once, 7 ~ 9 furnace every day, iron output is about 10 ~ 13t.
High carbon ferrochrome furnace each time a sample analysis, each sample analysis is required to provide the results of the furnace length and before the furnace within 1 hour.
Smelting and pouring are three shifts of production, the annual working days are 330 days.
The flue gas generated by electric furnace smelting enters the dust removal flue through the chimney, and the flue gas generated by electric furnace exiting iron enters the dust removal flue through the top suction hood and flue. The bag dust collector is arranged on the outside of the plant, and the dust emission concentration after treatment reaches the national emission standard.
The circulating cooling water of the electric furnace is supplied by the circulating water pumping station. After cooling, the cooling water enters the electric furnace and flows back to the cooling pool by using the drop. After natural cooling in the pool, the water is supplied to the front of the furnace by the pump.
Electric furnace transformer:
Three-phase transformer model: HSSP-12500kVA/33kV
Rated capacity (KVA) : 12500, long-term overload 20%, short-term overload 30%
Cooling mode: OFWF, ≯32ºC, ≯45ºC.
Primary voltage (KV) : 33
Secondary voltage (V) 134 ~ 182V, (stage difference 3V, total 17 stages)
Secondary rated voltage (V) 158
Secondary rated current (kA) 45.68
The short-circuit impedance is < 6% at 158V, and the internal impedance of the coil is ≤5%
Connection mode: Iio voltage regulation mode:
Wireless electric insulation level: BIL480Ac200 Cooling mode: forced oil circulation water cooling
Side outlet terminal: 3-phase 8-group outlet copper Ф65/4500-0.02, length 200 mm
Three-phase cascade group: △/△-12 Frequency (HZ) : 50
Furnace shell: The furnace shell is rolled by steel plate δ16, horizontal and vertical steel plate δ16, the width is 200mm, and the distance between them is < 1m. The bottom plate is fabricated with steel plate δ20, and under the bottom plate I beam 32 is arranged side by side for support. 2 nozzles (made of steel plate δ20, arranged at 150°). Steel plate material: Q235-A. The spray water device is considered on the outer wall of the furnace shell.
Diameter of shell: Ф7500
Furnace shell height: 4400
Lining: the inner wall of the furnace is made of magnesia-brick, and the inner wall of the furnace shell is made of magnesia-pounded material from outside the magnesia-brick to the inner wall of the furnace shell. Between the lining and the furnace shell, a thermal expansion joint of > 80mm is left, and the refractory crushed, refractory fiber felt, asbestos board and other materials are filled. At the bottom of the furnace, a layer of asbestos board is laid first, and then 13 layers of clay bricks are laid, and then magnesium is used to pound the material, and the top layer is magnesium bricks.
Diameter of furnace: Ф5900
Furnace depth: 2400
Water-cooled smoke hood: the shape is regular dodecagons arch structure. Twelve water-cooled columns (seamless steel tube Ф159×8) support a set of tortoise-back water-cooled skeleton beam (seamless steel tube Ф159×8), there is insulation between the skeleton beam and the column, and there is insulation between the column and the furnace shell. Between the skeleton beam is filled with high aluminum bonding material (stainless steel Ф12), there are two kinds of cover plate, the outer ring is carbon steel water cooling cover plate, the central triangle area is stainless steel water cooling cover plate. Twelve sides of the chimney walls are formed between the columns, and there are three and nine small . The inner side plate of the cover, the size of the door and the column are welded with slag nails, and there is 80mm thick high aluminum binder. Fume hood diameter: Ф7800 fume hood height: 2000
Chimney: There are 2 water-cooled smoke pipes (steel plate δ8) on the top of the water-cooled smoke hood, and there is insulation between the cover plate. Above the water-cooled pipe is a single-wall pipe (steel plate δ6), which is also insulated in between. The chimney is insulated between the support of each floor and the floor, and the top of the chimney is provided with a bell jar valve for closing the chimney and a reserve opening for dust removal fles, and a lightning rod is above the bell jar valve. Chimney diameter: Ф1600 Chimney elevation: +30.000
Short net: The electric furnace is powered by a three-phase transformer, and the water-cooled secondary tubular structure bus system is used between the transformer and the electrode. The secondary bus system includes water-cooled compensation cable, conductive copper pipe, water-cooled cable, insulation hanging device, water-cooled copper tile and so on. The transformer has 8 groups per phase with a total of 48 outgoing terminals. Copper pipe specifications: Ф65×10 Water cooling cable: 1800mm2×2.4m water cooling compensation cable: 1800mm2×0.9m
3 sets of control device distribution pole center garden is Ф2650±50, each phase electrode diameter Ф1000, electrode lifting adopts 2 sets of hanging type cylinder Ф200, stroke 1200mm; The electrode pressure discharge adopts hydraulic mechanical lock and pressure discharge cylinder Ф125, stroke 120mm; Can be implemented with voltage amplifier. The copper tile is made of forged copper, the pressure ring is treated with magnetic isolation, and the water-cooling protective sleeve and the lower control cylinder are made of stainless steel 1Cr18Ni9Ti. Pole center garden: Ф2650±50 electrode diameter: Ф1000 lifting speed: 0.5m/min lifting cylinder: Ф200/1.6m pressure drain cylinder: Ф125/0.12m copper watts: δ80350900
The water cooling system adopts two sets of water distributors located on both sides of the lower part of the transformer on the second floor platform. The water source is provided by the water pumping station, and the cooling water is sent to the short net, copper tile, pressure ring, water cooling protective sleeve, water cooling smoke hood, water cooling chimney and hydraulic station for cooling. Another way to soften the water into the transformer of the strong oil water cooler. The short net, copper tile, pressure ring and water cooling protective cover are equipped with inflatable water discharge device, which is used for rapid drainage when the furnace is stopped for maintenance. Water dispenser equipped with pressure gauge, thermometer.
Hydraulic system The hydraulic system provides the adjustment and control function of electrode lifting and electrode pressure and discharge. The oil supply of the hydraulic station should meet the requirements of simultaneous lifting of two sets of electrode systems, and the pressure supply should meet the requirements of 6Mpa still working. Tank volume: 1500L Gear pump: flow 50L/min, pressure 12Mpa, motor 11kW one with one standby. Hydraulic oil: HM-46 Cleanliness grade: NAS7
The feeding system is equipped with 11 top bins in a circular distribution on the three-layer platform, and the bin is a circular structure with a wall thickness of δ10, a diameter of Ф1600, and a volume of 4m3. Each bin is set up a hydraulic sector valve, the following feeding pipe Ф426×10 material is divided into two parts, 1m above the short net copper pipe is the dividing line, above Q235, below 0Cr18Ni9. The feeding pipe in the fume hood is Ф426×12, the material is 0Cr18Ni9, and can be adjusted up and down. Top bin: Ф1600×10 (4m3) Hydraulic sector valve: Ф426 feed pipe: Ф426×10 (Q235 and 0Cr18Ni9) furnace feed pipe: Ф426×12 (0Cr18Ni9)
The batcher and feeding system is composed of 6 batcher bins (3 chrome ore bins, 2 coke bins and 1 silica bin), each bin has an upper mouth size of 4000×4000, a lower mouth size of 500×500, a wall thickness of δ10, and an upper mouth elevation of +2.500m. One electric vibration feeder and one belt scale are set under each bin. All the weighed materials fall on the mixing belt machine, and then the mixed materials are transported to the roof transition belt machine by the large inclination belt machine, and the material is added to the hopper by the transition belt machine. Bin volume: 20m3 Electric vibration feeder: DZG40120 Belt weight: B=650×1.3m Mixing belt machine: B=800×23m large Angle belt machine: B=800×36m transition belt machine: B=800×8m
In the feeding system, 38kg/m track is laid on the top of 11 furnace bins on the three-layer platform, which is in circular distribution. The feeding car moves in circular motion, and the volume of the feeding car is 3m3. An electro-hydraulic sector valve is arranged under the hopper, and the driving device is composed of cycloid pinwheel reducer, double row roller chain, sprocket, etc. Charging car volume: 3m3 electro-hydraulic sector valve: DSZ-50A/1.5kW cycloidal pin reducer: 3kW track: 38kg/m
Iron, slag system Iron system is composed of hanging type gambling eye machine, iron chutes, water cooling cooling basin, water cooling ingot mold, etc. The iron port is opened by the hanging type gambling eye machine, the slag iron flows to the sedative basin through the iron chute, the high carbon chromium iron alloy liquid sinks into the bottom of the sedative basin, and the slag floats on it. When the slag iron flow is full, the slag flows into the side yellow sand pit from the overflow nozzle, and the iron liquid flows into the back 2 water cooling ingot molds, and is transported away with iron tongs and alloy boxes after cooling.
A top suction hood is arranged above each iron outlet, and the inner wall of the hood is welded with slag nails and knotted with 80 thick high aluminum binder. The exhaust pipe and manual butterfly valve are arranged on the side wall of each top suction hood, and the exhaust pipe is suspended below the second floor platform. After meeting, it is led out of the electric furnace workshop and interfaced with the dust removal pipe. Top suction hood mouth: 2m×2m exhaust pipe: 1200×700×5 Manual butterfly valve: 1200×700
Electrical equipment of ore-heating furnace The electrical equipment of 12500kVA high-carbon ferrochrome furnace is composed of 33kV high-voltage power supply system, electric furnace transformer, short net and electrode lifting control system. Transformer: low loss energy saving type ore furnace transformer, side outlet, electric load voltage regulation, forced oil circulation water cooling, impedance voltage 4 ~ 6%. And it has the advantages of small volume, light weight, strong overload ability and so on. High voltage power supply system. The basic composition of 33kV power overhead leads to the factory area, by the through-wall sleeve into the high voltage chamber, from the top into the PT cabinet, PT cabinet is mainly equipped with high voltage line isolation switch, voltage transformer, zinc oxide arrester, power supply to the high voltage distribution main cabinet, the cabinet is equipped with vacuum circuit breaker, current transformer, etc. Main parameters of high voltage switchgear rated voltage 33kV 50HZ three-phase operating power AC 220V outlet mode jacking protection grade IP20 Isolating switch rated voltage 10kV/50HZ rated current 180A operation mode manual Isolating switching voltage transformer rated voltage (10000V/√3)/(100V/√3)/(100V/√3) Primary winding rated voltage 10000V/√3 secondary winding rated voltage 100V/√3 residual winding rated voltage 100V/√3 capacity A three-phase three-winding voltage transformer with connection set of YO/YO/Δ-12-11 (the remaining voltage winding is connected into an open triangle) Vacuum circuit breaker model: ZN12-10/1250-25 Operation mode: Electric operation power supply voltage AC220V current transformer rated voltage 33kV variable ratio 300A/5A current transformer grade composition 0.5/10P grade zinc oxide arrester system nominal voltage 10kV arrester rated voltage 42kV Basic functions: in the high voltage room, there are two sides of high voltage cabinets, one is the PT inlet cabinet, which is equipped with zinc oxide arrester, and the other is the control cabinet equipped with high voltage vacuum circuit breaker, which is used to transmit electricity to the high voltage winding of the electric furnace transformer. Zinc oxide arrestor not only does the atmosphere overvoltage protection, but also does the vacuum circuit breaker in the division and combination of electric furnace transformer operation overvoltage protection. The vacuum circuit breaker can be operated on the cabinet surface of the high voltage cabinet, and can also be closed and opened in the main control room. The disconnector is operated manually in the high voltage chamber. The high voltage cabinet can display high voltage and current, and is equipped with electric energy measurement and protection devices. The operation room of the workshop power workshop is equipped with one side of the operation table, one side of the workshop power distribution cabinet and one side of the PLC cabinet. The operation panel is equipped with three ammeters, three primary side voltmeters, three secondary side voltmeters and each fault indicator light. The operation panel mainly controls the lifting and lowering of the three-phase electrode, automatic pressure discharge, manual pressure discharge and the dividing and closing of the high voltage cabinet. The power distribution cabinet in the workshop respectively transmit power to the hydraulic station, the main transformer room, the bridge crane and the lighting distribution box on each floor of the workshop, and are equipped with two sets of workshop reserve power. The hydraulic station on the third floor is equipped with a control cabinet, two hydraulic pump motors and DC 24V power supply, and electrode lifting system and pressure and discharge system lines. The laying method of the power pipeline in the workshop adopts plastic power cable and control cable along the flat iron hanger, and the partial cable that needs to be led to the vicinity of the equipment adopts pipe wearing. Lighting workshop lighting power supply from the workshop distribution cabinet to each floor lighting distribution box, centralized control. Each luminaire switch is installed near the luminaire. Electrical control system equipment level Electrical system design principles: 1, the selection of internationally renowned brands; 2, electric furnace industry general (special) model; 3, product quality assurance, stable performance; 4, convenient for users to use and maintenance. According to the above principles: the high voltage electrical system adopts the high voltage circuit breaker suitable for frequent on-off, and the system is integrated by China XD Company. Specially designed for electric furnace equipment configuration. The LOW-VOLTAGE control system is composed OF LOW-voltage electrical system and automatic control system. The components of the LOW-voltage electrical system use the international advanced French r electrical components, and the intermediate relays use the German WEidmuller relays or Japanese Omron products and terminals. PLC system adopts Siemens S7-300 and S7-200 system. The upper computer uses Siemens or Advantech industrial computer with high performance. Display for South Korea Samsung 21 inch color LCD. The printer is a HP laser printer. UPS power supply for the United States mountain special products. The weighing system adopts the high performance weighing sensor and weighing instrument of Shenzhen Gemann Technology. Electric power and digital display instrument using Hong Kong Changhui or Shangrun brand products. The switch and indicator light are made of Suzhou Siemens (formerly Shanghai No.2 Industry). Knife switch and circuit breaker are r or ABB brand products. The components of the whole electrical system are selected from the international general, advanced and stable products. Maximize the security and stability of the control system, and facilitate the maintenance of users. Vii. Dust removal equipment for mineral heating furnace 7.1. Design basis: (1), air pollution prevention and Control Law of the People's Republic of China (2), Environmental Protection Law of the People's Republic of China (3), industrial enterprise design health TJ36-- 79 (4), divided chamber back blowing bag type dust collector JB/T8534----1997 (5) Emission Standards for Air Pollutants in Industrial furnaces (GB9078-1996)
Company Profile
Liaoning Jinrong Machinery Import and Export Co., Ltd. is a large group company with its own import and export rights, integrating industry and trade. The registered capital of the company is 180 million RMB. The company's subsidiaries include Metallurgical Equipment Manufacturing Company, Electric Furnace Equipment Manufacturing Company, Electrical Equipment Manufacturing Branch, Mechanical Processing Branch, and Metallurgical Design and Research Institute
Our company can undertake turnkey projects for the design, manufacturing, installation, commissioning, and trial production of various metallurgical equipment. Our company can provide various metallurgical equipment and machinery such as mining machinery, ironmaking blast furnaces, sintering machines, coking coke ovens, converters, electric arc furnaces, ladle refining furnaces, continuous casting equipment, steel rolling heating furnaces, steel rolling production lines, steel structure factories, and cranes. Various types of mechanical equipment can also be provided
Our company is a direct agent for large steel mills such as Ansteel, Bengang, and Fushang. We have a complete range of steel products, including pipes, plates, profiles, and wires, all of which are available in stock. If there are special specifications, material requirements, etc., we can organize and arrange ordering and selection, schedule production and rolling to ensure supply.
Our company has a history of 30 years and has established friendly contacts with over 120 countries and regions, as well as engaged in various aspects of cooperation. We welcome customers from various countries to visit and inspect our company.
Address: :1-51-901-3041, Floor 9, Jiangsu Building, Qianyuan Emerging Market, Tiexi District, Anshan City, Liaoning Province
| Total Number of Staffs |
585 |
| Total Number of Managers |
40 |
| Total Number of Technical Staffs |
160 |
| Total Number of QC Staffs |
15 |
| Total Number of workers |
310 |
| Total Number of other staffs |
60 |
| Contact person |
Mr .Su |
Position |
president |
| Tel |
0086-412-8554538 |
Mobile |
0086-13700125807 |
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