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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a b e r k o w


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30.12.2014 Energy KMP - Marc Hlling 1

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)


Project Idea

E A F

L F 2

L F 1

LadleHeater

C C M


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RadiationLosses


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]

2014.12.09 - last minute burner - hölling.ppt

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