With the increasing short-circuit power of system,it is an effective way to solve the large capacity of short-circuit breaking by using parallel breaking technology which composed by a high coupling splitter reactor a...With the increasing short-circuit power of system,it is an effective way to solve the large capacity of short-circuit breaking by using parallel breaking technology which composed by a high coupling splitter reactor and two parallel breakers in series.According to research the TRV equivalent calculation circuit and initial conditions in equal current mode and limit current mode respectively,the prospective TRV of CB1and CB2have been calculated for rated voltage of 252 kV and rated short-circuit current of85 k A.The results indicate that TRV of CB1and CB2are not affected by high split coupled reactor in equal current interruption mode,and TRV of CB1is under the standard requirement values after first current zero crossing and the TRV of CB2is exceed the standard requirement values after second current zero crossing which is also higher than the ITRV and line-side TRV of SLF in limit current interruption mode.Furthermore,the research conclusions of this paper can provide the theory and reference basis for parallel breaking technology.展开更多
Research into flow instability at both subcritical and supercritical pressures has attracted attention in recent years because of its potential of occurrence in industrial heat transfer systems. Flow instability has t...Research into flow instability at both subcritical and supercritical pressures has attracted attention in recent years because of its potential of occurrence in industrial heat transfer systems. Flow instability has the potential to affect the safety of design and operation of heat transfer equipment. Flow instability is therefore undesirable and should be avoided?in the design and operation of industrial equipment. Rahman?et al. reviewed studies on supercritical water heat transfer with the aim of providing references for SCWR researchers. It was found out that most of the CFD studies and experimental studies were performed with single tube geometry due to the complexity of parallel channel geometry. Because studies performed with parallel channel geometry could provide detailed information to the design of the SCWR core, they called for more studies in parallel channel geometry at supercritical pressures in the future. In order to help understand how flow instability investigations are carried out and also highlight the need to understand flow instability phenomenon and equip the designers and operators of industrial heat transfer equipment with the needed knowledge on flow instability, this study carried out a review of flow instability in parallel channels with water at supercritical pressures.展开更多
A lab-scale parallel photoreactor model has been developed for broad applications in organic chemistry.Position,angle,and distance in the reactor are systematically optimized for achieving high reproducibility under t...A lab-scale parallel photoreactor model has been developed for broad applications in organic chemistry.Position,angle,and distance in the reactor are systematically optimized for achieving high reproducibility under the guidance of the Inverse Square Law and Lambert’s Cosine Law,which were first applied in the design of the photoreactor.Improvement of photon efficiency is realized via 3-point irradiation and broad-band light reflector of aluminum.Photon flux is measured with an optical power meter with its display and adjustment suggested being integrated into the photoreactor for the first time.展开更多
文摘With the increasing short-circuit power of system,it is an effective way to solve the large capacity of short-circuit breaking by using parallel breaking technology which composed by a high coupling splitter reactor and two parallel breakers in series.According to research the TRV equivalent calculation circuit and initial conditions in equal current mode and limit current mode respectively,the prospective TRV of CB1and CB2have been calculated for rated voltage of 252 kV and rated short-circuit current of85 k A.The results indicate that TRV of CB1and CB2are not affected by high split coupled reactor in equal current interruption mode,and TRV of CB1is under the standard requirement values after first current zero crossing and the TRV of CB2is exceed the standard requirement values after second current zero crossing which is also higher than the ITRV and line-side TRV of SLF in limit current interruption mode.Furthermore,the research conclusions of this paper can provide the theory and reference basis for parallel breaking technology.
文摘Research into flow instability at both subcritical and supercritical pressures has attracted attention in recent years because of its potential of occurrence in industrial heat transfer systems. Flow instability has the potential to affect the safety of design and operation of heat transfer equipment. Flow instability is therefore undesirable and should be avoided?in the design and operation of industrial equipment. Rahman?et al. reviewed studies on supercritical water heat transfer with the aim of providing references for SCWR researchers. It was found out that most of the CFD studies and experimental studies were performed with single tube geometry due to the complexity of parallel channel geometry. Because studies performed with parallel channel geometry could provide detailed information to the design of the SCWR core, they called for more studies in parallel channel geometry at supercritical pressures in the future. In order to help understand how flow instability investigations are carried out and also highlight the need to understand flow instability phenomenon and equip the designers and operators of industrial heat transfer equipment with the needed knowledge on flow instability, this study carried out a review of flow instability in parallel channels with water at supercritical pressures.
基金support provided by NSFC(Nos.22125103 and 21971065)STCSM(Nos.22JC1401000,20JC1416800 and 20XD1421500)the Fundamental Research Funds for the Central Universities.
文摘A lab-scale parallel photoreactor model has been developed for broad applications in organic chemistry.Position,angle,and distance in the reactor are systematically optimized for achieving high reproducibility under the guidance of the Inverse Square Law and Lambert’s Cosine Law,which were first applied in the design of the photoreactor.Improvement of photon efficiency is realized via 3-point irradiation and broad-band light reflector of aluminum.Photon flux is measured with an optical power meter with its display and adjustment suggested being integrated into the photoreactor for the first time.
