Brief Introduction of 530m³ BF

450m³BF was starting construction in 2005，and put into operation at Sept. 18 2003，design production capacity is 550,000tpa，actual production capacity of hot metal is 600,000tpa, and it was modified into 530m³ blast furnace in 2010 because market requirement, at present,due to China domestic industry police to be regulated，this blast furnace stop production in 2013, each system equipment is under good condition.

This blast furnace was designed by Hebei Xinye Engineering and Technology Co.,Ltd..

1.       Inner Mode of Blast Furnace

Table 1           Schedule of Inner Mode Dimension of BF

2.         Main Equipment of BF’s Ore Stored ( Coke ) Silo

⑴  Oscillation Screen for Ore used        16sets

Mode：              BTS1430

Screen area：         1400×3000mm

Disposal amount：     150t/h

Swing：              6±1mm

Motor power：        2×5.5kw

⑵   Coke Oscillation screen  4sets

Mode：              BTS1426

Screen net area：      1400×2600mm

Disposal amount：     150t/h

Swing：              8±1mm

Motor power：        2×5.5kw

⑶   Return coke screen     1set

Mode：              TZS-60-150

⑷   Main belt of ore       B=800mm     V=2.0m/s

Main belt of coke      B=800mm     V=2.0m/s

Main belt of ore return  B=500mm     V=1m/s

Main belt of coke return B=500mm     V=1m/s

3.         Main Equipment of Charging System

Charging system adopts double skip cars with skew bridge for charging and bell-less type ( bunch bins) top charging equipment. Main equipment include skip cars、skip  windlass、rope wheel、bell-less ( bunch bins) top charging equipment、probe and probe’s windlass、balance pressure and discharging pressure system、top hydraulic station、top centralized grease lubrication station and maintenance crane equipment etc.

⑴  Skip car

Useful volume of Skip car     3.8m³×2

Main rail interval           1220mm

Vice rail interval            1430mm

⑵  skip car windlass

Max. capacity of windlass    12t

Max. liftup speed           2.44m/s

Drum dia.                 1800mm

Max. stroke of steel rope     ～80m

Steel roper dia.             32.5mm

Motor power of windlass     200kW， voltage 380v

Motor nos. of windlass       1set

⑶  Rope wheel

Rope wheel dia.            φ1800mm

⑷  Bell-less (bunch bins) top charging equipment

Mode                    WZG-C-400  bell-less top

Total height of complete set of equipment (from top flange to upper side of receiving material hopper)≯12.5m

Useful volume of receiving hopper      13m³

Useful volume of charge bin           16m³

Length of charge distribution chute     1.6m

Rotary speed of charge distribution

chute (positive and negative rotation)   8.82r/min(max)

titling angle of chute                 5°～40°(max. 0°-50°)

titling speed of chute                8°/s

Distribution mode  single ring、multi-rings、spiral and positioning distribution，automation and manual flexibly switchover

Transmission mode of each valve       Hydraulic transmission

Nitrogen adopted for balancing pressure on top bins

Water cooling, nitrogen sealing are adopted in the distributor of top bell-less equipment.

⑸  probe and probe windlass

Probe mode                       vertical soft probe  2sets

Probe windlass                    2sets

Liftup speed of probe               0.8m/s

Max. measure scope                5m

Drum dia. Of probe                 271mm

Steel rope dia.                     8.8mm

Motor power of probe windlass       5kw

Motor nos. of probe windlass         1set (each set probe)

⑹  balance pressure system

Balance pressure valve              φ200×2

Relief valve                       φ300×2

4.         Furnace Proper Cooling

Full cooling wall structure is adopted

There are different hot load in different position of blast furnace，therefore, different positions shall be adopted by different material and different structure mode cooling walls：

Low Chrome cast iron cooling wall with plain surface shall be adopted for furnace

hearth；

spheroidal graphite iron cooling wall with plain surface is adopted for the tuyere；

furnace belly、furnace bosh、lower part of furnace stack are adopted by three sections copper cooling wall；

upper and upper of furnace stack adopts spheroidal graphite iron embedded brick with

single layer water cooling pipe as cooling wall；

The top of furnace stack, namely lower of furnace throat brick adopts buckle-down

mode plain surface cooling wall with material of spheroidal graphite iron.

 

5.         Gravity Dust Remover

The shell DN8000mm of the gravity dust remover，upright pipe dia. of entering dust remover is DN2300mm，in order to ensure isolating BF from dust remover when blast furnace damping down， one φ1800mm coal gas breaking valve is installed on upper of dust remover，and operated by one set of electric windlass. Moreover. One φ200mm relief valve and one φ400mm relief valve are installed on top of gravity dust remover，and operated by electric windlass，to provide BF for releasing coal gas when BF is damping down for long term. Dust content is low down from 40g/Nm³ to 6～12g/Nm³ after crude gas is de-dusted by primary dedusting，and then delivery to purifying facility of bag dust remover for fine dedusting.

Dust damping unloading machine is installed under lower end of tapered body of dust

remover .

6.         Hot Blast Stove

Four sets of cyclone top combustion hot blast stove are equipped

（1）combustion-supporting blower

Two sets of supporting-combustion blowers are totally equipped in supporting- combustion fan room，one work and one standby. Mode of blower：9—26NO16D，

Blast capacity：52392m³/h，

Wind pressure：6884pa，

Motor mode：Y355M1—6，motor power：160KW

（2）heat exchanger

Tube Mode Heat Exchanger is used for preheating supporting air

Table 2                  Main Performance of Heat Exchanger  

No.	Name	Unit	Value
1	Fume flow	Nm3/h	100000
2	Average Temperature of Fume at Entry	℃	250-300
3	Average Temperature of Fume at Exit	℃	160
4	Flow of Support-combustion Air	Nm3/h	40000
5	Temperature of Support-combustion Air at Entry	℃	20
6	Temperature of Support-combustion Air at Exit	℃	150

 

7.         Coal Pulverized Injection System

（1） Coal Grinder

Mode：HRM1900M，

Max. charging size <40mm

Production capacity：38-42t/h

Hatschek grindability coefficient ：≥55

Air temperature of entering grinder：<450grade℃

Air temperature at exit：           70-95℃

Water contained in material of entering grinder：<10%

Pressure difference of inlet and outlet：5000-6000Pa

    （2）powder receiver  

Disposal amount:      9000m³/h

Filter area :           2500m²

Purified filter air：     0.7-0.8m/min

Density at entry：     <1000g/Nm³

Density at exit：      <50mg/Nm³

Temperature at entry：<120℃

Pressure of air supply：0.5-0.7Mpa

 

8.         Bag Mode Dust Remover of Blat Furnace Gas

Box Nos.                      set           8

Filtering bag nos. of each box     piece         238

Filtering bag size               Φ4×L         φ120×6000

Filtering area of each box        m²           538

Filtering load adopted by design   Nm³/m²·h     35

Filtering gas amount of each box  Nm³/h        18830

Gas disposed amounted to       Nm³/h       150640

 

9.         Blast Furnace Blower

Blower model：    AV45-12 full rest vane adjustable and axial blower

Inlet air amount：  1760m³/min(E点)

Inlet pressure：    0.093Mpa(E point)

Inlet temperature： 8.2℃ (E point)

Outlet pressure：   0.034Mpa(E point)

Work rotary speed：7050r/min

Axial power：      4980kw

Motor model：     YGF800-4

Rated power：      6500KW

Rated voltage：     6000V

Rated rotary speed：1486r/min

Insulation grade：   F

Cooling mode：    upper water cooling

10.     Dedusting

Equipped with ore silo dedusting and cast house dedusting

11.    Water Supply and Drainage

Circulating water supply group pump with normal pressure are equipped with three sets of 500S59 model water pump (Q=1620-2020-2340m³/h，H=67-59-49m，N=450KW，n=920r/min，U=6000V，matched with motor of Y450 6-6)，two work and one standby.

High pressure circulating water pump block is equipped with two sets of 250D-60-2 model with conveniently dismantled mode centrifugal pump (Q=450 m³/h，H=120m，N=200KW，n=1450 r/min，U=450  V，matched motor Y315L2-4) one work and one standby.

12.    Power Supply and Distribution

Main electrical equipment models：

(1)  S9-1600---6/0.4-0.23kV power transformer：S9；

(2)  High voltage switch cabinet (HVP)：manual handling car mode KYN；

(3)  Low voltage distribution panel (PCC)：drawing out mode MNS，IP43；

(4)  power distribution box/panel on site (PDB/PDP)：outdoor metal enclosed self-stand mode，IP54.

Transmission main equipment models：

(1)  Motor control panel (MCC)：drawing out mode MNS，IP43；

(2)  Interface of relay panel (IRP)：metal enclosed self-stand mode，IP43；

(3)  AC frequency conversion speed control device：digital mode，IP43；

(4)  operation table/panel (CD/CP)：metal enclosed mode，IP44；

(5)  local operation box (SCB)：outdoor metal enclosed rain-proof and dust-proof mode，IP54.