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Experimental investigation on a parabolic trough solar co.lector for thermal power generation

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Science china(Technological Sciences) 2010年第1期53卷 52-56页

作者： LIU QiBin1,WANG YaLong1,2,GAO ZhiChao1,2,SUI Jun1,JIN HongGuang1 & LI HePing3 1 Institute of engineering Thermophysics,Chinese Academy of Sciences,beijing 100190,china 2 Graduate University of Chinese Academy of Sciences,beijing 100049,china 3.china huadian engineering co.,ltd,beijing 100044,china Institute of engineering Thermophysics Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China china huadian engineering co. Ltd Beijing China

Developing solar thermal power technology in an effective manner is a great challenge in *** this paper an experiment platform of a parabolic trough solar co.lector system(PTCS) was developed for thermal power generation,and the performance of the PTCS was experimentally investigated with synthetic oil as the circulate heat transfer fluid(HTF).The solar co.lector's efficiency with the variation of the solar flux and the flow rate of the HTF was *** co.lector efficiency of the PTCS can be in the range of 40%-60%.It was also found that there existed a specified delay for the temperature of the HTF to response to the solar flux,which played a significant role in designing the *** heat loss effect on co.lector efficiency was also studied,which was about 220 W/m for the receiver with a 180°C temperature difference between the co.lector temperature and the ambient temperature,amounting to about 10% of the total solar energy incident on the *** enco.raging results can provide fundamental data for developing the parabolic trough solar thermal power plant in china.

关键词： solar energy parabolic trough solar co.lector co.lector efficiency lag behind heat loss

北京2022年冬奥会与冬残奥会延庆赛区,北京,中国

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世界建筑 2024年第4期 42-45页

作者： china Architecture Design&Research Group beijing General Municipal engineering Design&Research Institude co.ltd Eco.ign Moutain Resort Planners ltd Planungsbüro Deyle GmbH 中国建筑设计研究院有限公司北京市市政工程设计研究总院有限公司加拿大伊克森山地景区规划有限公司德国戴勒有限公司

北京2022年冬奥会与冬残奥会延庆赛区核心区规划和场馆及配套设施设计始于2017年1月,于2021年竣工投入使用。项目位于燕山山脉军都山以南的小海坨南麓,风景秀丽、山高林密、地形复杂、用地狭促,是最具挑战性的北京冬奥赛区。延庆赛区的... 详细信息

北京2022年冬奥会与冬残奥会延庆赛区核心区规划和场馆及配套设施设计始于2017年1月,于2021年竣工投入使用。项目位于燕山山脉军都山以南的小海坨南麓,风景秀丽、山高林密、地形复杂、用地狭促,是最具挑战性的北京冬奥赛区。延庆赛区的设计理念是“山林场馆,生态冬奥”,通过建筑、景观和赛道设计的联合创新,打造冬奥场馆历史上新的里程碑,同时最大限度减少对环境的扰动,使建筑与自然景观有机结合,在满足精彩赛事要求的基础上,建设一个融于自然山林中的冬奥赛区。

关键词：军都山残奥会联合创新延庆融于自然冬奥场馆最大限度

Experimental study on upward bubble velocity and pierce length distributions in a water model of co.per co.verter

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Journal of University of Science and Technology beijing 2003年第6期10卷 16-21页

作者： Bin Du, Jiayun Zhang, Tuping Zhou, and Qifeng ShuMetallurgical engineering School, University of Science and Technology beijing, beijing 100083, chinaLegend co. ltd., beijing 100085, china Metall. Eng. Sch. Univ. of Sci. and Technol. Beijing Beijing 100083 China Legend co. ltd. Beijing 100085 China

The upward bubble velocity and the pierce length distributions in a sectionalwater model of the co.per co.verter in Guixi Smelter in Jiangxi, china, were measured using atwo-co.tact electro-resistivity probe. In the case of using a single tuyere, the bubble velocitydistribution along longitudinal direction was similar to that derived from Guassian function. Beyondthe center of the longitudinal range, the bubble pierce length exhibited a sudden increase. Theupward bubble velocity at a specified location co.ld go up to meters per seco.d. Its probability ata fixed location obeys a lognormal function; the bubble pierce length there varies bellow a fewcentimeters. In the case of using multi-tuyeres, the upward bubble velocity was roughly uniformright above the tuyeres and showed a slow decrease beyond this region. The bubble pierce lengthwithin both of these two regions was roughly uniform. Its average value in the former region,however, was found to he somewhat lower than that in the later.

关键词： upward bubble velocity bubble pierce length distribution co.per co.verter

Mourning for renowned pharmaco.ogist Professor Geng-Tao Liu

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World Journal of Gastroenterology 2010年第20期16卷 2577-2578页

作者： Lian-Sheng Ma,beijing Baishideng BioMed Scientific co.,ltd.,beijing 100025,china beijing Baishideng BioMed Scientific co. Ltd Ocean International Center No. 62 Dongsihuan Zhonglu Chaoyang District Beijing 100025 China

At 22:08 h on February 27,2010,Professor Geng-Tao Liu,a renowned pharmaco.ogist affiliated with the Department of Pharmaco.ogy,Institute of Materia Medica,Chi-nese Academy of Medical Sciences,beijing,an academi-cian o... 详细信息

关键词： Mourning for renowned pharmaco.ogist Professor Geng-Tao Liu Figure

Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

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Science china(Technological Sciences) 2009年第1期52卷 204-209页

作者： DU GaoXiang1,3, ZHENG ShuiLin2 & DING Hao1 1 School of Materials Science and Technology, china University of Geosciences (beijing), beijing, 100083, china 2 School of Chemical and Environment engineering, china University of Mining and Technology (beijing), beijing 100083, china 3 Hebei Qinghe Refractory Group co. ltd., Xingtai 054804, china School of Materials Science and Technology China University of Geosciences (Beijing) Beijing China Hebei Qinghe Refractory Group co. ltd. Xingtai China School of Chemical and Environment engineering China University of Mining and Technology (Beijing) Beijing China

Silica is the major co.ponent of the acid leaching residue of asbestos tailing. The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution. co.pared to the high temperature reaction method, this process is environmental friendly and low co.t. In this paper, the reaction process of the residue and the sodium hydroxide aqueous solution is optimized. The optimum reaction process parameters are as follows: the usage of sodium hydroxide is 26.4 g/100 g acid leaching residue, the reaction temperature is 90℃, the reaction time is 1 h, and the ratio of the liquid/solid is 2.0. The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxide > the ratio of the liquid/solid > the reaction time > the reaction temperature. The significance sequence to the leaching ratio of SiO2 is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solid > the usage of sodium hydroxide > the reaction time > the reaction temperature. Under the optimum co.ditions, the leaching ratio of the SiO2 is 77.5%, and the modulus of the sodium silicate is 3.15. The XRD analysis result indicates that the major co.ponents of the alkali leaching residue are serpentine, talc, quartz and some albite.

关键词： asbestos tailing acid leaching residue sodium hydroxide process optimization

Biogas reco.ery from microwave heated sludge by anaerobic digestion

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Science china(Technological Sciences) 2010年第1期53卷 144-149页

作者： QIAO Wei1,WANG Wei2,ZHU CuiPing3 & ZHANG ZhongZhi1 1 co.lege of Chemical Science and engineering,china University of Petroleum,beijing 102249,china 2 Department of Environmental Science and engineering,Tsinghua University,beijing 10084,china 3 J & K china Cleaning Energy Technology co.ltd.,beijing 100085,china co.lege of Chemical Science and engineering China University of Petroleum Beijing China Department of Environmental Science and engineering Tsinghua University Beijing China J & K china Cleaning Energy Technology co. ltd. Beijing China

Biogas generated from sewage sludge,livestock waste,and food waste by anaerobic digestion is a valuable renewable energy ***,co.ventional anaerobic digestion is not an efficient process.A long hydraulic retention time and low biogas reco.ery rate hinder the applications of those *** effective pretreatment method to destroy sludge microbial cells has been one of the major co.cerns regarding improvement of the biogas *** article focuses on the effects of microwave heating on sludge anaerobic *** suspended solid(VSS) and chemical organic demand solubilization of heated sludge were *** heating was found to be a rapid and efficient process for releasing organic substrates from *** increase of organic dissolution ratio was not obvious when holding time was over 5 min with microwave *** effect of the VSS solubilization was primarily dependent on heating *** highest value of VSS dissolving ratio,36.4%,was obtained at 170°C for 30 *** co. dissolving ratio was about 25% at 170°*** organic carbon of treated sludge liquor was 1.98 and 2.73 g/L at 150°C and 170°C for 5 min,respectively.A biochemical methane potential(BMP) test of excess sludge and a mixture of primary and excess sludge demonstrated an increase in biogas *** total biogas from microwave treated mixture sludge increased by 12.9% to 20.2% over co.trol after 30 days of *** production was 11.1% to 25.9% higher for excess sludge than for untreated *** VS removal ratios of mixture sludge and excess sludge were 12% and 11% higher,respectively,co.pared to the untreated sludge.

关键词： biogas reco.ery microwave heating sludge anaerobic digestion

co.struction of High-Efficiency and Low-co.t Clean Steel Production System in Shougang Jingtang

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Journal of Iron and Steel Research International 2011年第S2期18卷 42-51页

作者： ZHANG Fu-ming,CUI Xing-chao,ZHANG De-guo(beijing Shougang International engineering Technology co.,ltd.,beijing 100043.china) beijing Shougang Int Engn Technol co.ltd Beijing 100043 Peoples R China

This paper analyzes the technology for clean steel production in modern iron and steel plant,a philosophy with production efficiency,manufacturing co.t and product performance in its *** also makes a review on functions of high-efficiency,low-co.t and high-quality steel products manufactured by the new generation iron and steel plant,in co.bination with the study on design of steelmaking-co.tinuous casting process of Shougang Jingtang iron and steel *** applying precise and dynamic design system to optimize and allocate systems and working procedures of hot metal pretreatment,co.verter smelting,seco.dary refining,co.tinuous casting process,etc,a platform of high-efficiency,low-co.t and high-quality clean steel production is built.

关键词： steelmaking co.tinuous casting clean steel hot metal pretreatment seco.dary refining

Stabilization of Chaotic Time Series by Proportional Pulse in the System Variable Based on Genetic Algorithm

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International Journal of Minerals,Metallurgy and Materials 1999年第3期13卷 228-229页

作者： Qing Li Deling Zheng Jianlong Zhou(Information engineering School, University of Science and Technology beijing, beijing 100083, china)(Handan iron and Steel co., Handan 056015, china) Information engineering School University of Science and Technology Beijing Beijing 100083 China Handan Iron and Steel co. Handan 056 015 China

The PPSV (Proportional Pulse in the System Variable) algorithm is a co.venient method for the stabilization of the chaotic time series. It does not require any previous knowledge of the system. The PPSV method also has a shortco.ing, that is, the determination off. is a procedure by trial and error, since it lacks of optimization. In order to overco.e the blindness, GA (Genetic Algorithm), a search algorithm based on the mechanics of natural selection and natural genetics, is used to optimize the λi The new method is named as GAPPSV algorithm. The simulation results show that GAPPSV algorithm is very efficient because the co.trol process is short and the steady-state error is small.

关键词： stabilization chaotic time series genetic algorithm

Soil erosion and sediment transport in the gullied Loess Plateau:Scale effects and their mechanisms

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Science china(Technological Sciences) 2009年第5期52卷 1283-1292页

作者： LI TieJian1,WANG GuangQian1,XUE Hai2,3 & WANG Kai4 1 State Key Laboratory of Hydroscience and engineering,Tsinghua University,beijing 100084,china 2 Yellow River engineering co.sulting co.,ltd.,Zhengzhou 450003.china 3 North china Institute of Water co.servancy and Hydropower,Zhengzhou 450008,china 4 china Institute of Water Resources and Hydropower Research,beijing 100038,china State Key Laboratory of Hydroscience and engineering Tsinghua University Beijing China Yellow River engineering co.sulting co. Ltd. Zhengzhou China North china Institute of Water co.servancy and Hydropower Zhengzhou China china Institute of Water Resources and Hydropower Research Beijing China

Scale effects exist in the whole process of rainfall-3-runoff-3-soil erosion-3-sediment transport in river basins. The differences of hydrographs and sediment graphs in different positions in a river basin are treated as basic scale effects, which are more co.plex in the gullied Loess Plateau, a region notorious for high intensity soil erosion and hyper-co.centrated sediment-laden flow. The up-scaling method of direct extrapolation that maintains dynamical mechanism effective in large scale application was chosen as the methodology of this paper. Firstly, scale effects of hydrographs and sediment graphs were analyzed by using field data, and key sub-processes and their mechanisms co.tributing to scale effects were clearly defined. Then, the Digital Yellow River Model that integrates sub-models for the subprocesses was used with high resolution to simulate rainfall-3-runoff-3-soil erosion-3-sediment transport response in Chabagou watershed, and the distributed results representing scale effects were obtained. Finally, analysis on the simulation results was carried out. It was shown that gravitational erosion and hyper-co.centrated flow co.tribute most to the spatial variation of hydrographs and sediment graphs in the spatial scale. Different spatial scale distributions and superposition of different sub-processes are the mechanisms of scale effects.

关键词： scale effect soil erosion hyper-co.centrated sediment-laden flow the Loess Plateau