THE LONG WAY TO PCI IN LINZ –
FIRST OPERATION EXPERIENCE
14.09.2016 / Bernhard Rummer
ECIC 2016 / 7th European Coke
and Ironmaking Congress
voestalpine Steel Division
www.voestalpine.com/stahl
Content
Ø History of reducing agents in Linz
Ø PCI-project requirements and constraints
Ø Technical concept - layout and flowsheets
Ø Commissioning
Ø Coal injection stability and deviation between single injection lances
Ø Summery
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Ironmaking facilities in Linz
Blast Furnace
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BF 5
BF 6
BF A
Last Relining
[Year]
03.2015
09.2009
10.2004
Working
Volume
[m3]
1.175
1.201
3.125
Hearth
Diameter
[m]
8,0
8,0
12,0
Bell Less Top
-
Z&J
Z&J
Paul Wurth
Tuyeres
[No.]
17
17
32
Tapholes
[No.]
1
1
3
Nominal
Capacity
[t/d]
1.850
1.850
7.850
Historical timeline of reducing agents in Linz
End of 90´s
since 2000
2002
2006
2010
since 2014
Coke (Linz)
Coke (Linz)
Coke (Linz)
Coke (Linz)
Coke (Linz)
Coke (Linz)
Heavy oil
Heavy oil
Heavy oil
Heavy oil
Heavy oil
Heavy oil
Tar oil
Coke (abroad)
Coke (abroad)
Coke (abroad)
Coke (abroad)
Coke (abroad)
Crude tar
Crude tar
Crude tar
Crude tar
Coke oven gas
Coke oven gas
Coke oven gas
Coke oven gas
Waste plastics
Waste plastics
Waste plastics
Crude tar (abroad) Crude tar (abroad)
Natural gas
Natural gas
PCI
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PCI-project requirements and constraints
Ø Reducing agents for the future: BF5 and BF6 only coal, backup coke oven gas
(injected)
BFA coal, waste plastics and crude tar, backup natural gas
No heavy oil on any BF
Ø Injection capacities:
20 t coal/h at BF5 and 20 t coal/h at BF6
60 t coal/h at BFA
this means up to 180kg PCI/tHM
Ø
Ø
Ø
Ø
Ø
Ø
easy coal logistics (supply, unloading,…) and synergy effects with the coke plant
coal stock capacity for at least 15 days
high operational availability of the PCI-plant
additional emissions (dust,...) have to be avoided
save rare space around the BFs
No change of the burden and coke quality for the economic feasibility study
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Layout of the PCI-plant
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Layout of the PCI-plant
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Flowsheet of the PCI-plant
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Raw coal & grinding-drying
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Layout - raw coal preparation
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Project phases / milestones - key supplier
Ø 7 pre-project between 1989 – 2010
Ø last pre-project
05/2010 - 03/2011
Ø order awarded to Küttner
11/2012
Ø start of construction
03/2013
Ø start injection
BF-A
03.11.2014
BF5
02.03.2015
BF6
16.03.2015
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supplier / key components
Crane
Hyundai
Raw Coal Preparation
Grinding and Drying
Main Supplier PCI
BTW Binder / Siemens
Küttner
Coal Mill
Alstom
Bag Filter
Lühr
Hot Gas Generator
Lösche
Injection Plant
ESCH
Development of the PCI-rate at BF A
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Coal injection stability at BFA
mass flow measurement (10-minute average)
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PCI at BF6 – problems with coal flow measurement
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Deviation of single injection lines at BF A
Ø flowmeters in series (adjusted):
deviation between mass
flowmeters of +/- 5% was found
Ø The differences between the
lances were in a range of +/- 8%
on all three BFs
Ø Values up to 50% from literature
can not be confirmed
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Summery
Ø The project was done on schedule and within budget
Ø The commissioning took place without major problems on all BFs
and the performance data were achieved
Ø So far we have no problems on the fine coal transport-lines over
1.800m from the grinding to the injection plant near the BFs
Ø The used mass flow measurements aren’t reliable – further tests
with new products will follow
Ø During the drying and grinding process coal mine gas is released –
the additional installation of a waste gas treatment is necessary to
fulfill the strict emission limits in Linz
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Thanks for your attention !
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