Top Charging System
Top Charging System
Top Charging System
Top Charging System
* Nippon Steel & Sumikin Engineering has supplied 80 or more units of blast furnaces and delivered two
types of top charging system: bell type and bell-less type according to the customer needs.
* For the stable operation of blast furnace, it is important to uniformly charge burden peripherally. Nippon
Steel & Sumikin Engineering 's top charging system has the function for realizing such requirement.
Anti-segregation technology
●Uniform center of layer & Uniform layer thickness
(Un‐controled)
No.1
(controled)
No.1
No.2
No.2
Material flow control valve installed
・Uniform center of layer
・Uniform layer thickness
→ Stable gas flow inside furnace
Center of
No.1 & 2 layer
(coke & ore)
Center of
No.1 layer (coke)
Center of
No.2 layer (ore)
f
●Uniform particle size
Temporal change of particle size of burden : Large
Temporal change of particle size of burden : Constant
60
50
Weight ratio(%)
60
Weight ratio(%)
50
40
40
30
20
Fine particle
30
10
20
Fine particle
Medium particle
Coarse particle
10
0
0
20
40
60
CL
80
100
Uniform particle size
→ Uniform gas flow inside furnace
Medium particle
Coarse particle
0
0
20
Time(%)
Segregated distribution of coarse particle and fine particle
40
60
80
100
Time(%)
CL
Un‐segregated distribution of coarse particle and fine particle
Center feed of coke
Stable running
Service life : 15
years
●Nippon Steel & Sumikin Engineering's
original chute drive unit
●Nippon Steel & Sumikin Engineering's
original chute structure
Conventional chute
Cylindrical chute
* Structure to reduce wear on large bearing of slewing chute drive unit
Accuracy for center feed is enhanced by the cylindrical chute.
Top Charging System
New type BF charging equipment
* Nippon Steel & Sumikin Engineering is planning to carry out a model test using a prototype with a chute of approx. 2m length.
Nippon Steel & Sumikin Engineering developed a new type top charging system for the purpose of enhancing the raw material charging accuracy.
Cylindrical Chute
● Simple&Compact structure→Manufacturing cost is unexpensive.
structure→Manufacturing cost is unexpensive.
● Short free fall length of material & varying material impact area by rotating chute → Chute liner life is long.
● High‐speed tilting → It is possible to shorten the time of center feed, which is normally the bottleneck for the time schedule.
Supply record
T o p C h a r g in g S y s t e m
Actual result of delivery：82unit Total
82 Unit
No. Year
Country
1
2
3
4
5
6
7
8
9
10
Japan
Japan
Japan
Japan
Japan
Japan
Japan
Japan
Japan
Japan
2001
2002
2003
2003
2004
2007
2007
2009
2012
2014
Customer
Nippon Steel
Hokkai
Nisshin Steel
Nippon Steel
Nippon Steel
Nippon Steel
Kobe Steel
Nippon Steel
Nippon Steel
Nippon Steel
* Table below covers the latest 10 cases.
Contents
Chute-type(Vertical double-stage hopper)
Chute-type(Vertical double-stage hopper)
Chute-type(Parallel doublestage hopper)
Chute-type(Vertical double-stage hopper)
Bell type
Chute-type(Parallel doublestage hopper)
Bell type
Bell type
Chute-type(Parallel
Chute
type(Parallel doublestage hopper)
Chute-type(Parallel doublestage hopper) (under designing)
Remarks
Kimitsu 3BF
2BF
Kure 2BF
Kimitsu 4BF
Oita 2BF
Nagoya 1BF
Kakogawa 2BF
Oita 1BF
Kimitsu 2BF
Tobata 4BF