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VRFB-ESS용 전해질의 이온가수 분석방법 및 SOC 분석
서혜경,박원식,김강산,Seo, Hai-Kyung,Park, Wonshik,Kim, Kangsan 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2
For the detection of the state of charge in VRFB-ESS, the analyses of UV-Visible spectrometry and the measurements of potential between the anolyte and catholyte were used in parallel. This paper includes the production of 4-valant ion from VOSO4 powder, 3- and 5-valant ions from electrochemical charge of 4-valant ion and 2-valant ion from 3-valant ion. It also includes the analyses of these valance ions and unknown electrolyte at any time using UV-Visible spectrometry. Through the analyses of the valance ions in samples, the SOCs of the samples at any charge-discharge times were verified.
장시간 충방전에 따른 VRFB-ESS의 용량 손실 회복에 대한 연구
서혜경,박원식,박재우,김강산,최한솔,Hai-Kyung, Seo,Wonshik, Park,Jae-woo, Park,Kangsan, Kim,Hansol, Choi 한국전력공사 2022 KEPCO Journal on electric power and energy Vol.8 No.2
As the charges/discharges of VRFB-ESS were repeated during 150cycles or more, the capacity of electrolyte in VRFB-ESS was decreased little by little. It results from the decreasing of the level of anolyte and the increasing of the valance value of the catholyte. Then, we tried to recover the capacity loss with 3 different ways. The first way was that the levels of anolyte and catholyte were allowed to be evenly equalized when the difference in the levels of two different electrolytes were severe. The second one was to lessen the valance value of the catholyte through the reduction reaction to 4-valant ions of 5-valant ions in the catholyte with the reductant, oxalic acid. The last one was that the all electrolytes of analyte and catholyte were allowed to be electro-chemically reduced to 3.5 of the valance value by oxidizing new electrolyte with 3.5 valance ions. The last way was the most effective to recover the capacity loss.
The experimental study of 1 ton/day coal gasifier using Adaro coal
박세익(Park, Seik),정재화(Jung, Jaehwa),서혜경(Seo, Hai-Kyung),이중원(Lee, Joongwon),주지선(Ju, Ji-Sun),지준화(Ji, Junhwa),김미영(Kim, Miyoung),김기태(Kim, Kitae) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Korea Electric Power Research Institute (KEPRI) has developed a compact coal-gasification system to accumulate our experiment skills. The combustion furnace for residual oil was modified as a small size coal gasifier. Recently, coal feeding system was also upgraded to control coal feed rate more accurately. Our research group has conducted several experiments to find out the effect of O₂/coal ratio on the cold gas efficiency. Furthermore, the effect of N₂/coal ratio on the transport characteristics was also studied. According to the calculation of heat and mass balance, the cold gas efficiency was estimated to the maximum at O₂/coal ratio of around 0.73. But small size gasifier such as ours required higher value of O₂/coal ratio than that of the theoretical estimation. On the optimal N₂/coal ratio, we noticed that the coal feed rate was intimately related with the transporting gas pressure and the pipe diameter.