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He F.,University of Science and Technology Beijing | Zhu L.,Agricultural University of Hebei | Jiang W.,China Iron and Steel Association
2014 International Conference on IT Convergence and Security, ICITCS 2014

It is one of the issues for international researchers engaging in data envelopment analysis (DEA) that how to evaluate the environmental efficiency of traditional industry with high pollution, high energy consumption under the background of circular economy. In this paper, we make use of the standard BCC DEA model which treats the undesirable outputs as inputs and undesirable slacks-based measurement (SBM) model to evaluate environmental efficiency of China's 48 iron and steel enterprises. The results indicate that BCC model overestimates efficiency and then cannot provide quantitative information accurately for company directors. So based on the undesirable-SBM model, we not only conclude that the average environmental efficiency of China's iron and steel industry is declining over the period 2006-2010 due to the excess of energy consumption, waste water, waste gas and solid waste emission, but also we finally analyze the more accurate energy saving and the undesirable outputs reduction potential. © 2014 IEEE. Source

Jia T.,Northeastern University China | Feng J.,Northeastern University China | Wang B.,Northeastern University China | Wang G.,Northeastern University China | Li Y.,China Iron and Steel Association
Journal of Materials Processing Technology

Using "ultra fast cooling (UFC) + thermo-mechanical treatment (TMT)" process, nanoscale cementite particles were obtained while the matrix varied from "proeutectoid ferrite + degenerated pearlite" to complete lath-like bainitic matrix by controlling the UFC stop temperature. Microstructures were examined by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Results showed that TMT process promoted cementite precipitation in proeutectoid ferrite, leading to more uniformly distributed cementite particles. The tensile properties and Charpy V-notch (CVN) impact toughness were evaluated. The correlation with the microstructural features is then discussed in details. © 2015 Elsevier B.V. All rights reserved. Source

Han H.,CAS Institute of Process Engineering | Han H.,University of Science and Technology Beijing | Wu S.,University of Science and Technology Beijing | Xi J.,China Iron and Steel Association | Duan D.,CAS Institute of Process Engineering
Metalurgia International

Pilbara Blending Iron Ore Powder (PB powder) is blending ores with good and poor quality iron ores, so the mixed state of PB power is uncertain. In this work, the self-characteristics of PB powder and its single-components were studied respectively, such as the macroscopic properties, microscopic properties, and high-temperature properties, and the behavior and effect in the sintering were mastered. Then, aiming at the uncertain mixed state of blending ore powder, the evaluation system of the PB powder mixed state was built, and the mixed state of blending ore powder mastered. The results show that PB powder is composed of three kinds of iron ore, and the sintering characteristics of different iron ores are obviously discrepant. the evaluation system of the PB powder mixed state can be used to accurately judge the composition of iron ore powder in different batches, which provide technical basis on the effective use of PB powder. Source

Li K.-J.,University of Science and Technology Beijing | Zhang J.-L.,University of Science and Technology Beijing | Zhang Y.-P.,University of Science and Technology Beijing | Liu Z.-J.,University of Science and Technology Beijing | Jiang X.,China Iron and Steel Association
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering

Through the basic research on current situation of iron-making industry in China, the importance of iron-making industry in sustainable development was demonstrated, and the severe problems of energy consumption and environment protection were pointed out. And the key problems on energy saving and emission reduction in steel plants were analyzed based on carbon and energy flows, from which it was clear that the main task of emission reduction was to reduce the consumption of fossil fuels, such as coal and coke, and the main task of energy saving was to take advantage of the latent and sensible heat of top gas and sensible heat of blast furnace slag. Then, several advanced energy saving technologies, such as coke oven gas injection, injection of plastic scraps into the blast furnace, pure oxygen blowing and utilization of blast furnace slag, were analyzed. They did not make fundamental change to the blast furnace ironmaking process. Their popularity was critical to the improvement of energy saving and emission reduction in iron and steel industry in China. Finally, the research prospect of energy saving and emission reduction was indicated. In the short term, the utilization efficiency of fossil fuels should be improved based on in-depth research on consumption mechanism, and the structure of energy consumption optimized to alternate fossil fuel with clean energy. In the long term, the nature of iron making, carbon deoxidization, should be thought deeply in order to conduct exploratory research on innovation of ironmaking process and eliminate the fundamental shortcoming of current ironmaking process with high energy consumption and high emission. Source

Shangguan F.-Q.,Control Iron and Steel Research Institute, China | Zhang C.-X.,Control Iron and Steel Research Institute, China | Li X.-P.,Control Iron and Steel Research Institute, China | Fan B.,Control Iron and Steel Research Institute, China | Huang D.,China Iron and Steel Association
Journal of Iron and Steel Research

Several calculation methods of CO2 emission in the iron and steel industry were introduced and analyzed in detail, then the common grounds and differences among them were concluded as the references of the CO 2 emission calculation in Chinese iron and steel industry or enterprises. Source

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