Analysis of Influencing Factors of CO₂ Emissions from Integrated Steelworks Based on LCA

Abstract

The amount of CO2 emissions from steelworks accounts for a great share of the total CO2 emissions from industry in China. Thus, reducing CO2 emissions from steelworks is urgent for China’s environmental protection and sustainable development. This study aims at identifying factors that influence CO2 emissions from steelworks and proposing measures to reduce CO2 emissions. The life cycle inventory (LCI) of iron and steel products implies the relationship between the CO2 emissions of the steelworks and the input variables of the LCI. The Tornado Chart Tool is utilized to calculate the variation of CO2 emissions caused by the change of each input variables of LCI. Then, mean sensitivity of each input variable is calculated and the ranking criterion developed is used to identify the main factors influencing the integrated steelworks. Subsequently, measures for reducing CO2 emissions are proposed. The results indicate that the very important influencing factors of CO2 emissions in steelworks are the CO2 emission factor of Blast Furnace Gas (BFG), liquid steel unit consumption of continuous casting, continuous casting slab unit consumption of hot rolling and hot metal ratio of steelmaking. Consequently, many efficient measures for reducing CO2 emissions have been proposed, such as removing CO2 contained in BFG, decreasing the hot metal ratio of Basic Oxygen Furnace (BOF), recycling BFG, optimizing the products’ structure, etc.

Factors Affecting Energy‐Related Carbon Emissions in Beijing‐Tianjin‐Hebei Region

“…Gao et al analyzed the influence factors of carbon emissions in Inner Mongolia from 2001 to 2010 by using the LMDI model and revealed that the coaldominated energy structure and the fast-growing economy were the main reasons that influenced the carbon emissions [34]. The LMDI technique was used for the carbon increment of Beijing, and results showed that economic activity was the most important factor of carbon emissions growth [35,36]. Chen and Lin used LMDI and Kaya extension methods to analyze the factors of carbon emissions in Tianjin during the period of 2005-2011 and concluded that economic output played a positive role in the increase of carbon emissions, while economic structure, energy intensity of the production sectors, and energy mix of the production sectors played negative roles [37].…”

Interpolated Stand Properties of Urban Forest Parks Account for Posted Facial Expressions of Visitors

“…Otherwise, economic development can be associated with carbon dioxide (CO 2 ) emissions, which strengthened carbon (C) input into soils to form SOC [77]. Thus, fast industrial developments in steelwork, mining, metallurgy, and manufacture in Shaoguan emission [54] have tendencies to stimulate local CO 2 [78][79][80]. The negative relationship between GDP and soil TK may result from soil K deficits in regions with highly developed economies.…”

Reaction between Carbon Dioxide and Mechanically Activated Metal Powder

“…Here, subscript "g" and "ad" indicates solid and adsorption respectively. However, the adsorption of CO 2 on metals may be dissociation adsorption which is given by; CO 2(g) → C ad + 2O ad ( 2 ) Further investigation is necessary to clarify this point. This result also means that no decomposition of CO 2 occurred during the grinding.…”

“…As a result, the concentration of the CO 2 gas was increased and this has causes a serious global warming. A lot of methods and technologies, namely introduction of new environmental policy, development of high efficient energy conversion and saving, utilization of renewable carbon free energy source and so on, have been proposed to prevent the global warming from becoming worse [1,2]. One of the technologies against the global warming is the carbon capture and storage (CCS).…”