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Optimizing the process of desulfurization by powder injection in RH by commercial test

Optimizing the process of desulfurization by powder injectio...

引用

Materials Science and technology Conference and Exhibition 2013, MS and T 2013

作者： Yang, Honbo Li, Jingshe Gao, Zengfu Yang, Shufeng School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China State Key Lab of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9781629933092

Desulfurization by powder injection in RH is an important process to produce ultra-low-sulfur steel which has been widely applied to marine industry, aviation industry and petroleum transportation industry. In this paper, the motion trajectory of desulfurizer in RH was analyzed in detail to reach the conclusion that the desulfurization efficiency could be improved through reducing the quantity of desulfurizer inhaled into hot bends and increasing the desulfurizer staying time in liquid steel. Furthermore, commercial tests were carried out to study the relationships of desulfurization efficiency and RH process parameters including desulfurizer composition, top lance height, and driving gas flow rate when desulfurization was proceeding. Based on the relationships, finally, the optimal parameters, CaO/CaF2 was 90/10, top lance height was 1.3 m, driving gas flow was 50 Nm3/h, were found, which could ensure that the sulfur content in steel after RH process was less than 15×10 -4%. Copyright © 2013 MS&T'13®.

关键词： Petroleum transportation

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Optimization of a triggered vacuum switch with multi-rod electrodes system

Optimization of a triggered vacuum switch with multi-rod ele...

引用

2013 19th IEEE Pulsed Power Conference, PPC 2013

作者： Wang, Yanzhao Lin, Fuchang Dai, Ling Yao, Xingchen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China

ISBN: (纸本)9781467351676

One of the most important characteristic of triggered vacuum switch (TVS) is the breakdown voltage affecting the operation reliability of TVS. It depends on features, such as electrode material, electrode shape, gap distance and surface condition. For an optimized electrode's geometry, FEM electrostatic field simulations were conducted to evaluate the effect of geometric parameters on the electrostatic field strength and distribution. The distribution of electrostatic field of the TVS with multi-rod system is calculated by the finite method. The simulation results show that the geometric enhancement factor (GEF) is decrease with the increase of the fillet radius of the edge of the rod. In case of the fillet radius of the side face of rod 3mm and the fillet radius of the top face of the rod is 5mm, the GEF is up to the minimum value of 3. A lot of experiments are carried out. And the breakdown voltage of TVS with multi-rod system was measured by the high voltage direct current generator after switch currents with amplitude of 63kA and width of 13ms with the interval time of 10∼15min. The influences of electrode materials and operation times on the breakdown voltage are also studied. The experimental results show that the first breakdown voltage increased with the increasing of the operation times. And the breakdown voltage of CuCr (30%Cr) is higher than that of oxygen-free copper. © 2013 IEEE.

关键词： Electric breakdown

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advanced polarization estimation method using Spatial Polarization Characteristic of antenna

Advanced polarization estimation method using Spatial Polari...

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2013 43rd European Microwave Conference, EuMC 2013 - Held as Part of the 16th European Microwave Week, EuMW 2013

作者： Chang, Yuliang Shi, Longfei Dong, Jian Wang, Xuesong Pingxiao, Shun State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha 410073 China College of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9782874870316

The polarization of radar antenna vary with scan direction. This phenomenon is called Spatial Polarization Characteristic (SPC) of antenna. Based on the SPC of single polarized antenna, a novel polarization estimation method is established. Comparing with the traditional estimation method, this one has the following advantages: (i) It does not need dual-polarization channels to estimate the signal polarization;(ii) The polarization and angle of arriving(AOA) of a periodic signal can be estimated simultaneously;(iii) The full-polarization pattern of the antenna can be matched automatically during the estimation. The feasibility of this method is proved by simulation. © 2013 European Microwave Association.

关键词： Multiple signal classification

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Design of Anti-windup Compensator for Superconducting Magnetic Energy Storage

Design of Anti-windup Compensator for Superconducting Magnet...

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IEEE Power and Energy Society General Meeting

作者： Jiakun Fang Zhe Chen Chi Su Wei Yao Jinyu Wen Department of Energy Technology Aalborg University Aalborg Denmark State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479913022

Actuator saturation is a ubiquitous phenomenon when the outputs of controllers reach the actuators' limits, and then the dynamic performances become worse. In this paper, an anti-windup compensator (A WC) is designed for the controller of the superconducting magnetic energy storage (SMES) system to increase power system stability. First, power system with actuator saturation is modeled to formulate the problem mathematically. Then, uniform anti-windup scheme is studied and compensator is designed with method of linear matrix inequality (LMI). Instead of replacing the traditional controller with a new one, this paper makes use of the difference between the controller's and the actuator's output to mitigate the adverse influence of saturation, which leaves the original controller unaffected. Hence, this method can be used to enhance power system stability under the same capacity with its unsaturated controller so that SMES is utilized more efficiently.

关键词： energy storage actuator saturation anti-windup compensation residue transient stability.

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advanced polarization estimation method using Spatial Polarization Characteristic of antenna

Advanced polarization estimation method using Spatial Polari...

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2013 10th European Radar Conference, EuRAD 2013 - Held as Part of 16th European Microwave Week, EuMW 2013

ISBN: (纸本)9782874870330

关键词： Multiple signal classification

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Study on flow-reaction desulfurization of RH by physical experiment

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Materials Processing Fundamentals - TMS 2013 Annual Meeting and Exhibition

作者： Yang, Hongbo Li, Jingshe Gao, Zengfu Song, Fangfang Yang, Wanliang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China State Key Lab. of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9781118605981

Powder injection desulfurization (PID) in RH was always applied to produce ultra-low sulfur steel, which was used for aerospace industry, marine and petroleum industry. The process of PID was divided into two processes: one was flow-reaction desulfurization and the other one was interface-reaction desulfurization, especially the flow-reaction desulfurization had a huge impact on desulfurization efficiency of RH. In this paper, based on similarity principle, including geometric similarity, dynamic similarity, vacuum similarity and slag-metal interface similarity, a new physical simulation experiment in which water, nitrogen and one special kind of oil were chosen as the substitutes of liquid steel, argon and desulfurizer was carried out to study on the influence rules of vacuum chamber pressure, driving gas flow and flow-reaction desulfurization efficiency, which would have an important guiding significance to the practical production.

关键词： Slags

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Water-simulation for optimizing inner structure of special-shape tundish with gas curtain, retaining wall and retaining dam

Water-simulation for optimizing inner structure of special-s...

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Materials Science and technology Conference and Exhibition 2013, MS and T 2013

作者： Yang, Hongbo Li, Jingshe Zhang, Jiangshan School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China State Key Lab. of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9781629933092

Tundish is one essential device for getting high quality steel. Reasonable tundish inner structure can increase tundish space utilization rate, improve the inclusion removal, and reduce the cost of production. In this paper, based on similarity principle , a water simulation model was built to study the flow in tundish with different combination of gas curtain, retaining wall and retaining dam. The best combination of retaining wall and retaining dam was found, which could reduce the dead volume proportion to 16.6% from 38.9% and increase the plug volume proportion to 34.1% from 17.9%. After finding the best combination of retaining wall and retaining dam, adding gas curtain not only did not improve the tundish flow characteristics but worsen. However, because of the effective ability to remove inclusions, gas curtain was still a good choice for a big task of inclusion removal. Copyright © 2013 MS&T'13®.

关键词： Retaining walls

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Numerical simulating study on the solidification process of continuous casting billet

Numerical simulating study on the solidification process of ...

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EPD Congress 2013 - TMS 2013 Annual Meeting and Exhibition

作者： Zhang, Tongbo Li, Jingshe Yang, Hongbo Song, Fangfang Huang, Ting School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China State Key Lab. of Advanced Metallurgy University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9781118605745

Liquid core length is a very important parameter of the process of continuous casting, which directly reflects the cooling status in secondary cooling zone and solidification rate of the slab. In this paper, the billet caster in some steel plant in China was chosen as the prototype of simulating. A numerical simulating model for calculating the liquid core length of continuous casting billet was built by ProCAST software, which was verified reasonable and accurate by pin-shooting technique. Based on the model, the relationships between casting speed, casting temperature and liquid core length of casting billet were found, which was very practically useful for the workers on sit to improve casting billet quality.

关键词： Continuous casting

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electromagnetic-thermal modeling of electromagnetic brake using finite-element analysis

引用

5th International Conference on Mechanical and Electrical technology, ICMET 2013

作者： Zhang, Bo Chen, Qiao Cao, Quan Liang Ji, Kai Liu, Meng Yu Peng, Tao Li, Liang Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China Wuhan Institute of Marine Electric Propulsion China Shipbuilding Industry Corporation Wuhan China

ISBN: (纸本)9783037858349

A DC-excited high torque electromagnetic brake has been designed for high-speed train in WHMFC. An electromagnetic-thermal analysis model for electromagnetic brake analysis has been developed, taking into account the specific heat capacity-temperature relation, nonlinear magnetization-saturation and the skin effect. With simplification, the complex transient electromagnetic-thermal process has been successfully solved. This paper follows a previous work in which analysis was performed with electromagnetic analysis only. © (2013) Trans Tech Publications, Switzerland.

关键词： Thermoanalysis

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An improved demon registration with mutual information for non-rigid medical images

An improved demon registration with mutual information for n...

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2nd International Conference on engineering and technology Innovation 2012, ICETI 2012

作者： Xie, Xiaohui Ma, Cui Sun, Qiang Du, Ruxu Shenzhen Institutes of Advanced Technology Chinese Acdemey of Sciences Shenzhen 518055 China State Key Lab of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China Institute of Precision Engineering Chinese University of Hong Kong 999077 Hong Kong Shenzhen key lab of precision engineering Shenzhen China

ISBN: (纸本)9783037856123

Non-rigid image registration plays an important role in medical imaging. One disadvantage of classic Demons algorithm is that the topological preservation can not be ensured, and it can only deal with the single modality image registration. The mutual information algorithm has been validated useful for multi-modality image registration. By analyzing the critical points of Demons registration like mis-registration, an improved algorithm with mutual information evaluation is proposed. Experiment results show that the proposed algorithm can deal with multi-modality image registration well and it can hold the abilities even faces the noise and distortion. © (2013) Trans Tech Publications, Switzerland.

关键词： Image registration

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