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Effect of electrolysis superheat degree on anticorrosion performance of 5Cu/(10NiO-NiFe_2O_4) cermet inert anode

Journal of Central South University of Technology 2007年第6期14卷 768-772页

作者：王家伟赖延清田忠良刘业翔 School of Metallurgical Science and Engineering Central South University

5Cu/(10NiO-NiFe2O4) cermet inert anodes were prepared by cold-pressing and sintering process, and the effect of superheat degree of melting K3AlF6-Na3AlF6-AlF3 on their anticorrosion performance was studied under electrolysis conditions. The results show that, the fluctuation of cell becomes small with increasing of superheat degree, which is helpful to inhibit the formation of cathodic encrustation; the concentration of impurities from inert anode in bath goes up to certain degree, but it is far smaller than those in traditional high-temperature bath. Increasing the superheat degree of melting K3AlF6-Na3AlF6-AlF3 has unconspicuous effect on the contents of impurities in cathodic aluminum. The total mass fractions of Fe, Ni and Cu in aluminum are 15.38% and 15.09% respectively under superheat degree of 95 and 195 ℃. From micro-topography of anode used view, increasing the superheat degree can aggravate corrosion of metal Cu in inert anode, and has negative influence on electrical conductivity of electrode to some extent.

关键词： cermets inert anode aluminum electrolysis electrolysis corrosion superheat degree

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Theoretical analysis on expansion mechanism in carbon dioxide expander

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Science China(Technological Sciences) 2011年第6期54卷 1469-1474页

作者： TIAN Hua MA YiTai LI MinXia ZHANG MeiLan Thermal Energy Research Institute Tianjin UniversiO Tianjin 300072 China

The expansion mechanism inside carbon dioxide expander is analyzed theoretically in this *** mechanism analysis of metastable equilibrium indicates that there is a potential barrier during phase change *** is to say energy is required to overcome the potential barrier when the new interface is formed from primary *** superheat of liquid is the impetus of phase change and has an exponential decrease with the increase of the saturated temperature of *** analysis also indicates that there is a critical radius during the phase change *** bubble will grow up when its radius is larger than the critical value,otherwise,will *** considering the metastable phase change,calculation of P and V during expansion process indicates that the phase-change will be delayed with the decline of pressure,which is called lag *** phase-change delay time decreases with the increase of initial *** the initial temperature is close to the critical temperature,the delay time is close to *** phase-change delay brings energy losses,which decrease with the increase of initial temperature and its decrease ratio also has a decrease *** the initial pressure is 10 MPa,the energy loss will be 1.06 W with an initial temperature of 10℃ while 0.34 W with that of 20℃.

关键词： expansion mechanism carbon dioxide expander potential barrier superheat degree phase-change delay

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Exergy Analysis and Thermal Optimization of a Double-Turbine Regeneration System in a Ultra-Supercritical Double-Reheat Unit

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Fluid Dynamics & Materials Processing 2021年第1期17卷 71-80页

作者： Shidan Chi Tao Luan Yan Liang Xundong Hu Yan Gao School of Energy and Power Engineering Shandong UniversityJinan250061China Shandong Electric Power Engineering Consulting Institute Co. Ltd.Jinan250061China School of Thermal Engineering Shandong Jianzhu UniversityJinan250061China

Improving the primary steam parameters is one of the most direct ways to improve the cycle efficiency of a powergeneration system. In the present study, the typical problem connected to the excessively high superheat degree ofextraction steam in an ultra-supercritical (USC) double-reheat unit is considered. Using a 1000 MW power plantas an example, two systems (case 1 and case 2) are proposed, both working in combination with a regenerativesteam turbine. The thermal performances of these two systems are compared with that of the original systemthrough a heat balance method and an exergy balance strategy. The results reveal that the two coupled systemscan significantly reduce the superheat degree of extraction steam, turbine heat rate, and coal consumption of theunit and improve the energy utilization efficiency. These results will provide useful theoretical guidance to futureinvestigators wishing to address the general problem relating to energy conservation and modelling of the coupledextraction steam regenerative system of USC double-reheat units.

关键词： Ultra-supercritical unit exergy loss thermal performance regenerative steam turbine superheat degree

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Pore structure of unidirectional solidified lotus-type porous silicon

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Transactions of Nonferrous Metals Society of China 2014年第11期24卷 3517-3523页

作者：杨倩倩刘源李言祥张言清华大学材料学院北京100084 清华大学先进成形制造教育部重点实验室北京100084

Lotus-type porous silicon with elongated pores was fabricated by unidirectional solidification under pressurized hydrogen. Porosity, pore diameter, and pore length can be adjusted by changing solidification speed and hydrogen pressure. The porosity of the ingot is nearly constant under different solidification speeds, but decreases with the increase of hydrogen pressure. The overall porosities of ingots fabricated at different hydrogen pressures were evaluated through a theoretical model. Findings are in good agreement with experimental values. The average pore diameter and pore length increase simultaneously while the average pore aspect ratio changes slightly with the decreases of solidification speed and hydrogen pressure. The average pore length is raised from 7 to 24 mm and the pore aspect ratio is raised from 8 to 20 respectively with the average pore diameter promoted by about 0.3 mm through improving the superheat degree of the melt from 200 to 300 K.

关键词： lotus-type porous silicon solidification speed hydrogen pressure superheat degree pore length

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An Iterative Learning Model Predictive Control Strategy for Evaporator

An Iterative Learning Model Predictive Control Strategy for ...

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第37届中国控制会议

作者： Xiaohong Yin Xinli Wang Ximei Liu Ronghu Chi Mingming Lin Yanni Wang School of Automation & Electronic Engineering Qingdao University of Science & Technology School of Control Science and Engineering Shandong University Information and Communication Academy National University of Defence Technology

superheat degree of evaporator in heating, ventilating, and air-conditioning(HVAC) systems is a crucial variable, which not only maintains the system stability, but also impacts the system efficiency. In this study, an iterative learning model predictive control(ILMPC) strategy for the evaporator in vapor compressor refrigeration cycle(VCC) system is *** of all, a simple model of evaporator has been presented by mechanism knowledge and system identification. Then, based on the iterative learning theory and model predictive control method,an ILMPC controller is proposed to control the superheat ***, a simulation is provided to test the effectiveness of the proposed control strategy.

关键词： vapor compression refrigeration cycle system superheat degree iterative learning model predictive control

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