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The real-time measurement of welding temperature field and closed-loop control of isotherm width

Science China(Technological Sciences) 1999年第2期42卷 129-135页

作者：张华潘际銮廖宝剑 Institute of Mechatronics Nanchang University Department of Mechanical Engineering Tsinghua University

The real-time measurement of welding temperature field by colorimetric method is described, and with the data acquired from it closed-loop control system of the parameters of temperature field is developed and tested. Experimental results prove that it has high measurement speed (time of a field within 0.5 s) and good dynamic response quality. Weld penetration.can be controlled satifactorily under unstable welding condition.

关键词： welding temperature field thermal cycle real-time measurement closed-loop control of penetration.

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Economic Feasibility of Wind-Diesel Hybrid System： A Case Study of Rural Community in Kenya

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Journal of Energy and Power Engineering 2018年第4期12卷 197-201页

作者： Tsutomu Dei Khisa Sirengo Division of Mechanical Engineering Renewable Energy CourseAshikaga UniversityOmae-ChoAshikaga-CityTochigi 326-8558 Japa

In rural area of sub-Saharan Africa, the electrification rate is only 23%. There are isolated diesel power stations in sub-Saharan countries. However, power production by diesel generator is relatively high compared to that of national grid. In addition, public facilities such as rural school and health clinic have important role inproviding adequate public services in non-electrified communities. Therefore, in order to reduce power production cost, optimum configuration of the wind diesel hybrid generation system and the economic feasibility were studied. In the study, operational data of the existing diesel generator and wind potential were analyzed and optimum configuration of wind and diesel hybrid system was proposed. In addition, economic feasibility study of the hybrid system was conducted. In the result, EIRR （economic internal rate of return） of the proposed wind-diesel hybrid power plant was obtained as 10%.

关键词： Kenya BaJcagoi wind power wind-diesel hybrid penetration.

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Application of Alumina-magnesia Precast Blocks for LF Refining Ladle

Application of Alumina-magnesia Precast Blocks for LF Refini...

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中国材料大会2012

作者： Haixia Feng Jun Liu Yi Wei Sinosteel Corporation Luoyang Institute of Refractories Research Co. Ltd State Key Laboratory of Advanced Refractories

ISBN: (纸本)9783037856079

The alumina-magnesia precast blocks developed in author’s company have been successfully used in 90-ton LF refining with an average service life 80-85 heats to meet the smelting demand of low carbon steel and ultra low carbon steel. The observation of the residual blocks revealed that the section of the used blocks was divided into four layers from inside to the surface, i.e., slag layer, reaction layer, penetration.layer and the original block. It has been found that there was a certain degree of structure spalling of the used blocks. The main factor of blocks’ damage may be due to the penetration.and erosion of molten slag. The results of SEM microstructure analysis indicated that the calcium oxide(CaO) of high basicity slag easily penetrated into the blocks and formed CA6 phase, and then transformed into CA2 or C12A7 phases gradually with the decreasing content of alumina (Al2O3 ). It has been found that an annular distribution structure, and the silicon dioxide (SiO2 ) was easily lost together with slag and formed SiO2 -rich part in the penetration.layer due to the formation of low viscosity and low melting point phase of C2 AS. A large number of -5um spinel particles (MgAl2O4 ) were synthesized at 16001700℃, which could absorb FeO, MnO and other impurities in slag to form composite spinel phase. It is believed that the high melting point phases intertwined to form a dense area which was beneficial to improve the bricks’ slag resistances to penetration.and corrosion

关键词： Alumina-magnesia Precast block LF refining penetration.

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