2014.12.09 - last minute burner - hölling.ppt
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Last Minute Ladle Heater
ArcelorMittal Hamburg GmbH
9 th December 2014
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Hamburg Installation Steel Plant:
1 EAF & 2 LF Charging of DRI & Scrap Tapping weight of 140 t Tap to Tap of 66 min Annual production of
960.000 t billet Quality Steel Grades
and HAVs
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Transfer from Ladle Heater to tapping position
Priorities: Supply of steel to CCM (sequence) Ladle has to be in place before start
of tapping (no delay for EAF)
Procedure: Crane will transfer ladle in idle time Approx. 10...15 min waiting time of ladle Heat loss of approx . 1 MW ( 2 kWh/t)
to be compensated by superheated steel Project Idea for Energy Efficiency:
Install ladle heater at transfer car attapping position (start-up 2012, MEFKON)
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Project Idea
E A F
L F 2
L F 1
LadleHeater
C C M
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RadiationLosses
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Project Idea
Ladle
Last MinuteLadle Heater
Liquid steel
Last Minute Ladle Heater(lifted up)
Ladle in waiting position Ladle during tapping
EAF
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Advantages of Last Minute Ladle Heater Crane can transfer ladle whenever
suitable
No heat losses in waiting position Heating of ladle with Natural Gas
High temperature can be guaranteed lifetime of refractories
Reduced tapping temperature at EAF shorter Power-On time reduced electrical consumption reduced delays due to missing ladle
Electricity consumption vs. fuel for Last Minute Heater
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Ladle Heater with Oxygen & Natural Gas Very low NOx-content in off-gas
Higher flame temperature thanconventional burner with air/NG
Higher efficiency due to lowvolume flows (no nitrogen!)
No heat exchanger needed(and no air blower)
lower weight of construction small forces on mechanical parts reduced investment costs
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Savings
Parameters:
Tapping Temperature at EAF
Initial Temperature at LF O 2 and NG consumption
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Tapping Temperature at EAF
Decrease of tapping temperature of 7,7C lower heat loss of ladle due to last minute heater
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Consumption of NG and O 2
Average Power-On time of 34 min Average O 2-Consumption of 43 Nm per heat Average NG consumption of 21 Nm per heat
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Savings of 2.400 MWh el (factor of 0,4 kWh/t C 2,5 kWh/t)
Usage of 1.650 MWh th (NG) and 300.000 Nm O 2
Savings of 995 t CO 2/a (Planned: 810 t CO 2/a)
Cost reduction of 62.165 /a (2012) (Planned: 44.500 /a)
Capex of 234.179 (Budget: 185.000 )
Public Funding of 37.000 (Planned.: 37.000 )
Net-ROI of 3 2 years
Comment: Initial problems with media supply (leakage, duct rupture) Since mid of 2012 without any major problems
Summary
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Thank you for your attention!
ArcelorMittal HamburgDr. Marc Hlling+49 40 7408 [email protected]