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Study on flow-reaction desulfurization of RH by physical experiment

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

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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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Design of active power filter with LLCL filter

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2013年第SUPPL.1期28卷 203-208+223页

作者： Qi, Yu Peng, Li Wang, Qinghong Wu, Deliang Liu, Qian Zhang, Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Also School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China China Ship Development and Design Center Wuhan 430064 China

With series resonance occur though the inductor and capacitor, LLCL output filter could achieve better switching ripple filtering effect in the case of using less inductance obtained than LCL filter. This paper summarizes the LLCL filter parameters design method in the application of shunt active power filter, and passive damping characteristics are analyzed. It is propose that under the precondition of ensuring the stability, choose lower damping resistance to maintain the high switching ripple attenuation capacity. In terms of control, generalized integral controller is used to realize compensation of within 50 odd harmonic in power current. Finally, the simulation result proved the effectiveness of LLCL filter and generalized integral controller.

关键词： Controllers

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The optimal LCMV beamformer under multiple desired signals case

The optimal LCMV beamformer under multiple desired signals c...

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IET International Radar Conference 2013

作者： Xu, Zhen-Hai Chen, Ming-Zui Rao, Bin State Key Lab. of Complex Electromagnetic Environ. Effects on Electron./Info. System Changsha 410073 China School of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China

ISBN: (纸本)9781849196031

The optimal multiple linear constraint minimal variance (LCMV) beamformer is presented under multiple desired signals case. The theoretical solutions of the optimal weighted vector and maximum signal-to-interference-plus-noise-ratio (SINR) are derived by using variable substitution method. Simulation results show that the algorithm is superior to the traditional LCMV approach in the SINR, computational load and applicability. The algorithm can be applied in the area of radar tracking of low-angle targets and polarization radar signal processing.

关键词： Signal to noise ratio

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Studying on dimensional standardization of UHF partial discharge detection system

Studying on dimensional standardization of UHF partial disch...

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2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2013

作者： Hong, L. Qizheng, Ye Xingwang, Li Qifu, Lu Zhiguo, Tang Tian, Chen Electric Power Research Institute of Guangdong Power Grid Corporation Guangdong 510080 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei Province China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781479925964

In the ultra-high-frequency (UHF) partial discharge (PD) detection system, many physical quantities, such as voltage, charge, power and their normalization, were used to describe the UHF PD signal. The standardization of the dimensional has not been investigated thoroughly. Based on the PD forming mechanisms, the pulse transient electric field was presented as a main physical quantity in this paper. The minimum pulse transient electric field, which could be differentiated by the UHF PD detection system, was adopted as the sensitivity of detection system. The sensitivities of four detection systems were measured by GTEM platform, and comparison tests for Spike discharge in GIS were made. The experimental results were in accordance with the sensitivity of detection system. © 2013 IEEE.

关键词： Standardization

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Sliding Mode Pulsewidth Modulation (SMPWM) for nine-switch converter

Sliding Mode Pulsewidth Modulation (SMPWM) for nine-switch c...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Yu Chen Gang Wen Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) and College of Electrical and Electronic Engineering (CEEE) Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467351942

Nine-switch converter, which can provide two sets of three-phase outputs with independent amplitudes, phases and frequencies, has been proposed to replace two independent three-phase converters for cost- and size-reduced purposes. This paper proposes a hysteresis-modulation (HM) sliding-mode (SM) pulsewidth modulation (PWM) for the nine-switch converter. With the proposed HM-SMPWM, the phase currents of the two sets of outputs can track to their current references directly. To do this, decoupled sliding surfaces for the two sets of outputs are structured; based on the sliding surfaces, the proposed SMPWM are detailed explained; the operational range is also discussed; finally the experiments are carried out to confirm the effectiveness of analysis.

关键词： Trajectory Pulse width modulation Hysteresis Frequency conversion Frequency modulation Manifolds

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Tribological behaviors and corrosion resistance of aluminum alloys by nitrogen plasma immersion ion implantation

Tribological behaviors and corrosion resistance of aluminum ...

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作者： Jiang, Yehua Liu, Hongxi Zhou, Rong Tang, Baoyin Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 China State Key Lab. of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China

Nitrogen ions were implanted into LY12CZ aluminum alloy by plasma immersion ion implantation (PIII) technique. The chemical states, composition distributions, tribological properties, and anti-corrosion behaviors of the N-PIII coupons in 3.5% NaCl saturated solution were investigated. X-ray photoelectron spectroscopy (XPS) analysis indicates that the modified layer is mainly composed of AlN phase and a fraction of Al2O3 compounds. The depth profile of implanted nitrogen ion has two peaks, corresponding to 40 nm and 88 nm from the surface, respectively. The surface hardness is obviously improved by dispersion strengthening from AlN phase, and the maximum value increases by 140%. Friction and wear behaviors of all these samples exhibits that the friction coefficient reduces from 0.47 to 0.38. Compared with the untreated substrate, the anode polarization curves reveal that the corrosion potential (Ecorr) of all implanted samples increase and corrosion current density (Icorr) decrease, the maximum E corr increases by 200 mV and the minimum Icorr decreases by over two orders of magnitude. It also indicates that the wear tracks of modified coupons are much shallower and narrower than that of untreated sample, the minimum wear loss decreases by 43.4%. Tribological property and corrosion resistance of aluminum alloys strongly depended on the composition depth profiles of the modified layers. © 2013 advanced Study Center Co. Ltd.

关键词： Ion implantation

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