TY - THES

T1 - Evaluation of the potential for reduction of CO2-emissions at the secondary metallurgy

AU - Gerasev, Andrey

N1 - embargoed until null

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Stahlerzeugung

KW - Sekundärmetallurgie

KW - CO2 emissionen

KW - Pfannenofen

KW - Einsparmaßnahmen

KW - Emissionsminderung

KW - steelmaking

KW - secondary metallurgy

KW - CO2 emissions

KW - ladle-furnace

KW - cost savings

KW - emission reduction

M3 - Master's Thesis

ER -