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Wang P.,University of Science and Technology Beijing | Jiang Z.,University of Science and Technology Beijing | Jiang Z.,Energy and Environmental Research Center | Geng X.,University of Science and Technology Beijing | And 3 more authors.
Resources, Conservation and Recycling | Year: 2014

China is the largest steel producer and consumer around the world. Quantifying the Chinese steel flow from cradle to grave can assist this industry to fully understand its historical status and future options on production route transformation, capacity planning, scrap availability, resource and energy consumption. With the help of the systematic methods combined dynamic MFA (material flow analysis) with scenario analysis, the Chinese steel cycle during the first half of the 21st century was quantified and several thought-provoking conclusions were draw. In the past decade, lots of pig iron or molten iron was fed into EAF (electric arc furnace) and the scrap usage of EAF fluctuated slightly. Thus, the real scrap-EAF route share is much lower than the EAF production share. On the other hand, we reconfirmed that the scrap supply in China will rise significantly in the future. Meanwhile, the secondary production route share will grow sharply and exceed primary production share before or after 2050 depending on our options. The scrap recycling rate and construction's lifetime play a vital role in this trend. In the end, an intensive discussion on production capacities' adjustment and energy and resource consumption was conducted and relative policy suggestions were given. It is worth noting that scrap usage is crucial to future energy saving and emissions reduction of Chinese steel sector and its energy consumption might peak as early as 2015. © 2014 Elsevier B.V.


Jin P.,University of Science and Technology Beijing | Jiang Z.,University of Science and Technology Beijing | Zhang X.,Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry | Chen B.,Oxygen Company Ltd of WISCO | Tian F.,University of Science and Technology Beijing
Advanced Materials Research | Year: 2012

Thermodynamic analysis method for iron and steel manufacturing system is developed to describe the energy flow. The theoretical energy consumption for the manufacturing process is proposed to analyze the energy-saving potential. Energy balance based on enthalpy with a uniform reference state is established to analyze the amounts and forms of energy flow in the manufacturing system. The energy-saving potential of blast furnace system is discussed to choose the appropriate energy-saving methods and technologies. © (2012) Trans Tech Publications.


Jin P.,University of Science and Technology Beijing | Jiang Z.-Y.,University of Science and Technology Beijing | Jiang Z.-Y.,Energy and Environmental Research Center | Bao C.,University of Science and Technology Beijing | And 5 more authors.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2015

A one-dimensional mathematical model based on heat transfer and reaction kinetics was developed for an oxygen blast furnace and was validated with the operating conditions and dissected data of a conventional blast furnace. The influence of oxygen concentration and upper gas volume on the smooth operation and process variables of the oxygen blast furnace was investigated by the model combined with coal combustion at tuyeres and top gas balance for separation and preheating. When the oxygen blast furnace with top gas recycling is of low oxygen concentration and upper gas volume, the reduction of iron ore is worsen and massive unreduced iron oxide comes into slag. In the oxygen blast furnace with top gas recycling, oxygen concentration and upper gas volume have significant effect on the temperature, reducing ability of gas and reduction rate. A comparative analysis of the conventional blast furnace and the oxygen blast furnace with top gas recycling show that the oxygen blast furnace has a higher reducing ability of gas (1.0 to 1.5 times higher for CO content), faster reduction rate (1.49 m higher for the position of ore reduction), and less direct reduction (55.2% to 79.2% less for direct reduction degree). ©, 2015 All right reserved.


Jiang Z.,University of Science and Technology Beijing | Zhang X.,Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry | Jin P.,University of Science and Technology Beijing | Tian F.,University of Science and Technology Beijing | Yang Y.,University of Science and Technology Beijing
International Journal of Energy Research | Year: 2013

SUMMARY: Thermodynamic models for iron and steel manufacturing system are established to analyze the equilibriums of mass and energy and the characteristics of energy consumption. Based on the analysis of theoretical and practical energy consumptions, energy-saving potentials of the processes are obtained. Thermo-analysis software for iron-making process is developed and used to investigate the theoretical mechanisms and practical effects of some focused energy-saving technologies. For steel-making section, thermodynamic models of hot metal pretreatment, converter steel-making, secondary refining, and ladle transporting are established to simulate temperature and composition of liquid metal. Energy-saving measures are summarized by analyzing the effects of the operating parameters on energy-consuming process in the section. An integrated scheduling model of slab hot rolling section is established, which concerns the processes of slab transmitting, slab heating, and hot rolling. Production scheduling software and furnace control system are developed. As a result of practical application, the number of rolling units and energy consumption of reheating furnaces are minimized through the systematic optimization. Based on the physical model of dynamic ordered production, simulation platform of production and network model of energy flow are developed for iron and steel manufacturing system. The optimal operating parameters and energy distribution scheme of the main processes are obtained by using the platform and the model. © 2013 John Wiley & Sons, Ltd.


Ren L.,University of Science and Technology Beijing | Ren L.,Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry | Xia D.-H.,University of Science and Technology Beijing | Xia D.-H.,Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry
Physics Procedia | Year: 2015

The linear stability of flows with wall slip in microbearings is examined. The analytic expression of the basic flow for a narrow gap and the linearized differential equation governing flow instability for the case of axisymmetric disturbances are derived by using the Navier slip model. The generalized matrix eigenvalue problem of the flow stability is solved based on a Chebyshev collocation method. Neutral stability curves with wall slip are obtained. It is shown that, when the slip coefficient representing the degree of slip increases, the stable region expands in the instability diagram, showing the stabilizing effect of slip on the flow stability. © 2015 The Authors. Published by Elsevier Ltd.

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