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Influence of the electrolyte conductivity on the critical current density and the breakdown voltage

中国化学工程学报:英文版 2023年第7期59卷 169-175页

作者： Hae-Kyun Park Dong-Hyuk Park Bum-Jin Chung Department of Nuclear Engineering Kyung Hee University 1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do 17104Korea

The work investigates influence of the electrolyte conductivity on the onset of partial contact glow discharge electrolysis(CGDE)in a water *** current density(CCD)and breakdown voltage were measured together with in situ observation of hydrogen bubble behavior,whose influence has not been focused *** a fixed current during normal electrolysis,hydrogen coalescence adjacent to cathode surface was invigorated at a lower *** analyses elucidated the hydrogen coalescence characteristics by quantifying size and population of detached hydrogen *** CCD increased about 104% within given range of conductivity(11.50-127.48 mS·cm^(-1))due to impaired bubble coalescence,which delays hydrogen film formation on the ***,decreasing trend of breakdown voltage was measured with increased conductivity showing maximum drop of 74%.It is concluded that onset of partial CGDE is directly affected by hydrodynamic bubble behaviors,whereas the electrolyte conductivity affects the bubble formation characteristics adjacent to cathode electrode.

关键词： Water electrolysis Critical current density Breakdown voltage electrolyte conductivity Hydrogen bubble behavior

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Studies on electrolyte conductivity and Activity of Dehydrogenase of Chinese Fir and Masson Pine Bare-Root Seedling under Water and Cold Stress

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Forestry Studies in China 2003年第1期5卷 30-33页

作者： YuFangyuan XuXizeng GuoXinbao CollegeofForestResoureesandEnivironment NanjingForestryUniversityNanjing210037P.R.China HangzhouForestryandWaterConservancyBureau Hangzhou310016P.R.China

The electrolyte conductivity and activity of dehydrogenase of bare-root seedlings of both Chinese fir (Cunningha-mia lanceolata (Lamb.) Hook.) and Masson pine (Pinus massoniana Lamb.) under freezing and desiccation treatments were studied. The results showed that needle electrolyte conductivity of both species increase significantly after freezing treatment and there are no significant differences in needle electrolyte conductivity between the two species. The dehydrogenase activity (ARD) of fine roots of both Chinese fir and Masson pine was negatively correlated with increasing freezing and desiccation. The results suggest that both electrolyte conductivity and dehydrogenase activity could be used as quick indicators of Chinese fir and Masson pine bare-root seedling quality.

关键词： electrolyte conductivity activity of dehydrogenase (ARD) Chinese fir masson pine seedling quality

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PrF_(3)-NdF_(3)-DyF_(3)-LiF electrolyte system for preparation of Pr-Nd-Dy alloy by electrolysis

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Journal of Rare Earths 2022年第6期40卷 996-1001,I0006页

作者： Zhengping Zuo Yubao Liu Xin Yang Fengqin Liu School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

The application of Pr-Nd-Dy alloy in the field of high-performance Nd-Fe-B permanent magnet materials has great *** composition of the PrF_(3)-NdF_(3)-DyF_(3)-LiF(PND-LiF) electrolyte system used in the production of Pr-Nd-Dy alloys,the distribution of F,Li,RE and other elements in the electrolyte and their occurrence state were studied in this *** effect of temperature and lithium fluoride addition on electrolyte conductivity was revealed using the continuous conductivity cell constant(CVCC) *** thermal analysis method was used to study the influence of lithium fluoride addition on the electrolyte’s liquidus temperature and the optimal process conditions for the production of Pr-Nd-Dy alloy were *** results show that the overall distribution of praseodymium neodymium fluoride and lithium fluoride is uniform in the electrolyte and dysprosium fluoride is distributed between praseodymium-neodymium fluoride and lithium ***-neodymium oxide is embedded in praseodymium neodymium fluoride in spotty *** electrolyte’s conductivity is increased as the temperature and lithium fluoride addition are going up,while the liquidus temperature is going down with increasing lithium fluoride *** best electrolysis process conditions for the PND-LiF system to produce praseodymium neodymium dysprosium alloy are as follows:temperature1050℃ and 15.56 wt% PrF_(3)-62.22 wt% NdF_(3)-11.11 wt% DyF_(3)-11.11 wt% LiF.

关键词： Pr-Nd-Dy alloy Rare-earth electrolytic process Liquidus temperature electrolyte conductivity

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Control of hydrogen production by water electrolysis based on self-turning fuzzy-PI

Control of hydrogen production by water electrolysis based o...

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第24届中国控制与决策会议

作者： Gu deying 1 , Liu yingying 2 1. Department of Automation Engineering , Northeastern University at Qinhuangdao , Qinhuangdao 066004, China2. School of Information Science and Engineering , Northeastern University, Shenyang 110000, China

On the basis of production process requirements of hydrogen production by water electrolysis, the core controller of the control system employs S7-200 PLC. The rectified current settings are adjusted automatically according to the relationship between electrolyte conductivity and temperature. precise control of the rectifier current and accurate measurement of various parameters is realized by using PI control algorithm to ensure the hydrogen gas production and purity. The system is easy operation and high reliability .

关键词： Electrolyzer Hydrogen electrolyte conductivity fuzzy-PI

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