Evaluation of the potential for reduction of CO2-emissions at the secondary metallurgy

Andrey Gerasev

Research output: ThesisMaster's Thesis

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Abstract

Policies all over the world encourage the high energy efficiency of production processes and the reduction of greenhouse gas (GHG) emissions, classified as direct and indirect ones. Iron and steelmaking is an energy-intensive industry, which also supplies 30% of the direct global CO2 emissions (2007), triggered by the industrial processes. This thesis focuses on the verification of the CO2 emission’s distribution for the secondary steelmaking as well as on the evaluation of the potential to reduce such emissions. [X] The calculations of the current study were performed for the crude steel treatment in a ladle furnace (LF) during the transfer of liquid steel from the electric arc furnace (EAF) to the continuous casting machine (CCM). The crude steel treatment comprises the processes of steel alloying and steel heating in accordance with the steel grade requirements. The mass and heat balances for corresponding production route were calculated considering the steel- and slag-chemistry. The alloying concept and the mass- and energy-balances were developed regarding the basics of thermodynamics and industrial operation practice. The main influences for the variation of the CO2 emissions contribution are the additions during tapping, logistics of the ladle and ladle preheating treatment at the LF. These three influences were set as the most important for the following estimation of the potential savings and reduction of CO2 emissions. Estimation of the emission distribution and evaluation of the energy saving potential were analyzed considering different scenarios including mentioned influences. The potential for the energy savings were also expressed in terms of electricity consumption for LF-treatment.
Translated title of the contributionDie Evaluierung des Potentials zur Reduktion der CO2 Emissionen in der Sekundärmetallurgie
Original languageEnglish
QualificationDipl.-Ing.
Supervisors/Advisors
  • Schenk, Johannes, Supervisor (internal)
Award date21 Oct 2016
Publication statusPublished - 2016

Bibliographical note

embargoed until null

Keywords

  • steelmaking
  • secondary metallurgy
  • CO2 emissions
  • ladle-furnace
  • cost savings
  • emission reduction

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