Korean Journal of Chemical Engineering最新文献_第4页

System Design and Economic Evaluation of a Liquid Hydrogen Superstation 液氢超级站系统设计与经济评价

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-12-05 DOI: 10.1007/s11814-024-00351-7

Duho Kang, Haneul Mun, Jinwoo Park, Inkyu Lee

{"title":"System Design and Economic Evaluation of a Liquid Hydrogen Superstation","authors":"Duho Kang, Haneul Mun, Jinwoo Park, Inkyu Lee","doi":"10.1007/s11814-024-00351-7","DOIUrl":"10.1007/s11814-024-00351-7","url":null,"abstract":"<div><p>Liquid hydrogen (LH<sub>2</sub>)-based hydrogen refueling stations (HRSs) are promising for high-capacity refueling, given the high density of LH<sub>2</sub>, which facilitates large-scale transportation and storage. However, in LH<sub>2</sub> HRSs, the cryogenic cold energy of LH<sub>2</sub> is wasted during the vaporization process required to refuel hydrogen for fuel cell vehicles. To overcome this issue, this study proposes a novel LH<sub>2</sub>-based hydrogen superstation (HSS) that recovers the otherwise wasted cold energy to generate electricity for the station, with any excess electricity used to charge electric vehicles. To explore the most cost-effective configuration for cold energy recovery in the HSS, two power generation cycles were designed: one incorporating a Brayton cycle followed by a Rankine cycle (BC-RC), and another using two Rankine cycles in series (RC-RC). Combining the BC-RC and RC-RC configurations, this two-stage design is adopted to efficiently recover cold energy across a broad temperature range during the vaporization process. The HSS using the BC-RC configuration achieves 53% more cold energy recovery, generates 19% more power, and experiences 8% less exergy waste compared to the HSS with the RC-RC setup. However, in smaller-scale cold energy recovery systems applied to HSS, the cost savings from using pumps instead of compressors outweigh the additional power generation benefits of the Brayton cycle. Consequently, the HSS with the RC-RC configuration demonstrates the highest economic feasibility, with a 2% higher net present value.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"233 - 255"},"PeriodicalIF":2.9,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-Assembled Monolayers as Hole-Selective Contacts in Inverted Perovskite Solar Cells: A Review 自组装单层膜作为倒钙钛矿太阳能电池的孔选择接触：综述

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-12-04 DOI: 10.1007/s11814-024-00335-7

Huanxin Peng, Wenting Zheng, Ga-Yeong Kim, Jin-Wook Lee

引用次数: 0

3D CFD Analysis of Geometrical Design Impact on Hydrodynamic Performance in Hollow Fiber Membrane Contactors 几何设计对中空纤维膜接触器流体动力性能影响的三维CFD分析

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-12-02 DOI: 10.1007/s11814-024-00345-5

Ariyan Zare Ghadi, Jaeseok An, Taeho Kim, Jeongho Ko, Choongkyun Yeom, Boram Gu

{"title":"3D CFD Analysis of Geometrical Design Impact on Hydrodynamic Performance in Hollow Fiber Membrane Contactors","authors":"Ariyan Zare Ghadi, Jaeseok An, Taeho Kim, Jeongho Ko, Choongkyun Yeom, Boram Gu","doi":"10.1007/s11814-024-00345-5","DOIUrl":"10.1007/s11814-024-00345-5","url":null,"abstract":"<div><p>Hollow fiber membrane contactors (HFMCs) for degasification offer several advantages, including compact design, reduced power consumption, and higher mass transfer rate compared to conventional technologies. These characteristics make HFMCs an ideal choice for applications such as ultrapure water production and wastewater treatment, where the removal of even trace amounts of dissolved gases is critical. In this study, we conducted 3D computational fluid dynamics (CFD) simulations to explore the impact of geometric features on HFMC hydrodynamic performance. A scaled-down version of a commercial module (3 M-Liqui-Cel<sup>™</sup>) was used, preserving the actual dimensions and spacing of the hollow fiber membranes. Four different configurations were considered in the simulations based on the presence of a baffle and variations in the size and arrangement of liquid distributors. Analyses of fluid motion and pressure drop indicated that designs with larger distributors and internal baffles may reduce stagnation zones and promote more uniform flow distribution. At higher velocities, multiple recirculation areas were observed within the domain, with the size and volume of these zones varying across the different designs. These enhancements, driven by velocity fluctuations, vortex formation, and eddies, could potentially lead to higher mass transfer rates, especially at elevated flow rates. Additionally, the swirling arrangement of distributor holes in varied sizes yielded the lowest pressure drop for all flow rates studied, offering benefits in reduced energy consumption and increased operational efficiency. Our simulation results highlight the potential of optimized distributor hole sizes and patterns to enhance flow mixing and minimize pressure drop.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"271 - 289"},"PeriodicalIF":2.9,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical Studies on the Electronic Structures of Halide Perovskites: A Critical Review 卤化物钙钛矿电子结构的理论研究述评

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-27 DOI: 10.1007/s11814-024-00336-6

Seongyeon Hwang, Wooyeon Kim, Kyeounghak Kim, Min Jae Ko

引用次数: 0

A Study on the Redox Characteristics of Oxygen Carriers CaSnO3 and Materials Partially Substituted with Co and Ce for Chemical Looping Combustion

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-26 DOI: 10.1007/s11814-024-00337-5

Seung Hun Baek, Sang Jun Park, Hyang-Dong Kim, Jung Min Sohn

{"title":"A Study on the Redox Characteristics of Oxygen Carriers CaSnO3 and Materials Partially Substituted with Co and Ce for Chemical Looping Combustion","authors":"Seung Hun Baek, Sang Jun Park, Hyang-Dong Kim, Jung Min Sohn","doi":"10.1007/s11814-024-00337-5","DOIUrl":"10.1007/s11814-024-00337-5","url":null,"abstract":"<div><p>As a transition metal to be used for oxygen carrier, Sn-based oxides were expected to have high theoretical oxygen transfer capacity and have potential, and despite the low melting point, cycle stability was secured by forming a Ca–Sn perovskite structure. Nevertheless, it was also confirmed that high structural stability leads to a lower oxygen transfer rate compared to other oxygen carriers, that is, a relatively late reduction reaction completion time. In this study, in order to improve the oxygen transfer rate in the reduction reaction of Ca–Sn oxygen carriers, it was confirmed whether it was actually improved by partially replacing Co and Ce at the Ca site and whether it was applicable as oxygen carriers. It was confirmed that the substances that partially substituted Ce did not improve the oxygen transfer rate, and at the same time, the oxygen transfer capacity was partially reduced compared to CaSnO<sub>3</sub>. However, Ca<sub>0.9</sub>Co<sub>0.1</sub>SnO<sub>3</sub> reduced the reduction reaction time by 20% compared to CaSnO<sub>3</sub>. These findings suggest that Co is a promising candidate for improving the oxygen transfer rate of CaSnO<sub>3</sub>-based oxygen carriers in CLC processes.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 4","pages":"791 - 801"},"PeriodicalIF":2.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Qualitative Assessment of PC88A and HBTA Extractants in Lithium Recovery Processes Using Solvent Extraction 溶剂萃取锂回收工艺中PC88A和HBTA萃取剂的定性评价

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-26 DOI: 10.1007/s11814-024-00341-9

Junhyung Seo, Thang Toan Vu, Seungu Cho, Jieun Cha, Yeongeun Choi, Daesung Song

{"title":"Qualitative Assessment of PC88A and HBTA Extractants in Lithium Recovery Processes Using Solvent Extraction","authors":"Junhyung Seo, Thang Toan Vu, Seungu Cho, Jieun Cha, Yeongeun Choi, Daesung Song","doi":"10.1007/s11814-024-00341-9","DOIUrl":"10.1007/s11814-024-00341-9","url":null,"abstract":"<div><p>This study compares the solvent-extraction behavior of lithium (Li) using the cost-effective extractant PC88A (2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester) and the more expensive extractant HBTA (4,4,4-Trifluoro-1-phenyl-1,3-butanedione). PC88A achieved an optimal extraction rate of 37.6% at pH 5.43, with a maximum rate of 41.4% at pH 7.80. It required six stages at a 5/1 O/A ratio (organic phase-to-aqueous phase ratio) for 98% extraction and three stages at a 15/1 ratio for 100% extraction. In contrast, HBTA showed an optimal extraction rate of 86.2% at pH 6.23 and a maximum rate of 92.9% at pH 11.95. HBTA achieved 100% extraction with three stages at a 1/1 O/A ratio and 98% with one stage at a 5/1 ratio. By applying McCabe–Thiele methods, this study figured out that to achieve a 98% lithium extraction rate at 5/1 of O/A ratio, PC88A requires 6 stages, whereas HBTA achieves the same extraction rate in just 1 stage. This result indicate that a sixfold difference in efficiency if these extractants used in the counter-current solvent-extraction process. These findings reveal HBTA’s striking superiority over PC88A in terms of efficiency. Future studies should include evaluations of equipment and extractant costs, and overall efficiency.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 2","pages":"323 - 328"},"PeriodicalIF":2.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Mitigating Membrane Degradation in Degraded Membrane Electrode Assembly of Polymer Electrolyte Membrane Fuel Cell through Temperature and Humidity Control 通过温度和湿度控制减轻聚合物电解质膜燃料电池降解膜电极组件中膜降解的研究

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-25 DOI: 10.1007/s11814-024-00322-y

Seungtae Lee, Sohyeong Oh, Donggeun Yoo, Kwonpil Park

{"title":"Study on Mitigating Membrane Degradation in Degraded Membrane Electrode Assembly of Polymer Electrolyte Membrane Fuel Cell through Temperature and Humidity Control","authors":"Seungtae Lee, Sohyeong Oh, Donggeun Yoo, Kwonpil Park","doi":"10.1007/s11814-024-00322-y","DOIUrl":"10.1007/s11814-024-00322-y","url":null,"abstract":"<div><p>Polymer electrolyte membrane fuel cells (PEMFCs) have faced challenges in achieving their lifespan goals due to the degradation of the membrane electrode assembly (MEA) during long-term operation. To enhance the durability of PEMFCs, it is necessary to research materials that can improve the durability of the membrane and electrodes, as well as to study operating conditions that can reduce degradation. This paper investigated methods to mitigate the membrane degradation of electrochemically degraded MEAs by controlling humidity and temperature among the operating conditions. MEA was degraded electrochemically by conducting open circuit voltage (OCV) holding, and then the degradation rate according to temperature and humidity changes was observed through fluoride emission rate (FER) change. In a degraded MEA, it is shown that increasing cell humidity accelerates membrane degradation. According to linear sweep voltammetry (LSV) results, this was confirmed to be due to the increase in hydrogen permeability caused by the higher humidity. The decrease in temperature lowered the rate of membrane degradation, which is attributed to a decrease in the rate of radical attack and generation resulting from the temperature decrease. Therefore, it was confirmed that to mitigate membrane degradation in electrochemically degraded MEAs, it is effective to reduce temperature and humidity, thereby decreasing the rate of radical formation.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"157 - 164"},"PeriodicalIF":2.9,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing Thermal Stability with Cellulose Derivative: A Study on Porosity and Molecular Interactions 纤维素衍生物增强热稳定性：孔隙度和分子相互作用的研究

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-23 DOI: 10.1007/s11814-024-00338-4

Jae Woo Shin, Sang Wook Kang

{"title":"Enhancing Thermal Stability with Cellulose Derivative: A Study on Porosity and Molecular Interactions","authors":"Jae Woo Shin, Sang Wook Kang","doi":"10.1007/s11814-024-00338-4","DOIUrl":"10.1007/s11814-024-00338-4","url":null,"abstract":"<div><p>In the present investigation, advanced porous membranes were fabricated utilizing a cellulose derivative (CD) characterized by a molecular weight of 380,000, renowned for its thermal stability and mechanical fortitude. A vacuum-assisted technique facilitated the production of membranes endowed with vertically oriented, interconnected channels. Under a regimen of 1 bar pressure within an N<sub>2</sub> atmosphere, the membranes demonstrated specific Gurley values and porosities, illustrating the capability to modulate physical properties through alterations in the CD to glycerin ratios, notably 1:0.9 and 1:1.1. TGA highlighted CD’s elevated melting point and thermal resilience, with glycerin incorporation serving to augment thermal stability, albeit the induction of pores subsequent to the vacuum process slightly attenuated this attribute. SEM analysis substantiated the precise engineering of vertically aligned channels and pores, validating the efficacy of the production methodology. Flux measurement investigations indicated that an increase in glycerin concentration resulted in diminished curvature of the internal channels and an enhanced density of surface pores. FT-IR spectroscopy analyses shed light on the molecular interactions, revealing the influence of glycerin on the energy absorption of the O–H bond within CD, thus fortifying intermolecular bonds. This impact was consistent in samples both before and after the vacuum treatment, indicative of chemical modifications attributed to glycerin addition, particularly manifested in the peak shift around 1050 cm<sup>−1</sup>.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"133 - 142"},"PeriodicalIF":2.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interface Engineering Between Membrane and Electrodeposited-IrO2 Electrode Using One-Sided Hot Pressing to Produce Efficient Proton Exchange Membrane Water Electrolyzers 单侧热压膜与电沉积iro2电极界面工程生产高效质子交换膜水电解槽

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-23 DOI: 10.1007/s11814-024-00332-w

Hye Jin Lee, Seunghoe Choe, Donghoon Shin, Inki Jeong, Sung Ki Cho, Sung Jong Yoo, Jin Young Kim, Katie Heeyum Lim, So Young Lee, Hyun S. Park, Kwang Ho Song, Jong Hyun Jang, Hee Young Park

{"title":"Interface Engineering Between Membrane and Electrodeposited-IrO2 Electrode Using One-Sided Hot Pressing to Produce Efficient Proton Exchange Membrane Water Electrolyzers","authors":"Hye Jin Lee, Seunghoe Choe, Donghoon Shin, Inki Jeong, Sung Ki Cho, Sung Jong Yoo, Jin Young Kim, Katie Heeyum Lim, So Young Lee, Hyun S. Park, Kwang Ho Song, Jong Hyun Jang, Hee Young Park","doi":"10.1007/s11814-024-00332-w","DOIUrl":"10.1007/s11814-024-00332-w","url":null,"abstract":"<div><p>Designing the structure of a membrane electrolyte assembly (MEA) is essential to maximizing catalyst utilization and improving the electrode performance at the single-cell level. In this study, one-sided hot pressing was employed to enhance catalyst utilization in an electrodeposited IrO<sub>2</sub> electrode for use in proton exchange membrane water electrolyzer (PEMWE) systems. An oxygen electrode loaded with 0.13 mg<sub>Ir</sub> cm<sup>−2</sup> IrO<sub>2</sub> was prepared via the anodic electrodeposition onto a Ti porous transport layer (PTL), which was subsequently assembled with a Nafion membrane via one-sided hot pressing. The IrO<sub>2</sub>/Ti-PTL electrode penetrated the membrane, and its pores were partially filled with the membrane component. The mean vertical thickness of the zone in which the IrO<sub>2</sub>/Ti-PTL pores are filled with the membrane strongly affected the contact area between the electrode and electrolyte, with greater thickness resulting in a broader electrode/electrolyte interface but reduced reactant (H<sub>2</sub>O) accessibility. The cell current density at 1.7 V and 80 °C was significantly improved to 1.44 A cm<sup>−2</sup> using the one-sided hot pressing approach; these were comparable to the values reported for state-of-the-art particle-type electrodes bearing higher loadings of platinum group metal (PGM) catalysts (~ 0.5 mg). This work highlights the great potential of film-type electrodes for use as low-PGM oxygen electrodes in PEMWEs.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"71 - 79"},"PeriodicalIF":2.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Medium Concentration, Surface Properties, and Chemotaxis on Biofilm Formation of Pseudomonas aeruginosa in Microfluidic Channels 介质浓度、表面性质和趋化性对微流控通道中铜绿假单胞菌生物膜形成的影响

IF 2.9 4区工程技术

Korean Journal of Chemical Engineering Pub Date : 2024-11-21 DOI: 10.1007/s11814-024-00340-w

Jae Seong Kim, So-Yeon Jung, Hye-Eun Kim, Chang-Soo Lee

{"title":"Influence of Medium Concentration, Surface Properties, and Chemotaxis on Biofilm Formation of Pseudomonas aeruginosa in Microfluidic Channels","authors":"Jae Seong Kim, So-Yeon Jung, Hye-Eun Kim, Chang-Soo Lee","doi":"10.1007/s11814-024-00340-w","DOIUrl":"10.1007/s11814-024-00340-w","url":null,"abstract":"<div><p>Biofilms, groups of bacteria that adhere to wet surfaces and resist antibiotics, often cause chronic infections and complications with medical devices. Despite their critical role in various environments, a significant gap remains in understanding biofilm dynamics within common ecological settings. Here, we investigate the formation and development of biofilm streamers in microfluidic channels using <i>Pseudomonas aeruginosa</i> PAO1 and its chemotaxis-blind mutant PC4. We find that biofilm streamers consistently form at the corners of microfluidic channels under low-speed flow conditions. We observe that higher concentrations of LB medium lead to the development of mature biofilms, while lower concentrations favor the formation of streamers. Also, the surface properties of the microfluidic channels significantly influence biofilm formation. The PEL-coated surfaces are more favorable to form biofilm streamers compared to bare glass surfaces. Furthermore, we investigate the role of chemotaxis with wild-type PAO1 strains formed streamers differently compared to the PC4 mutant, which confirms that chemotaxis significantly impacts streamer formation. These findings offer valuable insights into the physical and biological factors affecting biofilm development in microfluidic environments and provide important information for further studies on bacterial biofilms.</p></div>","PeriodicalId":684,"journal":{"name":"Korean Journal of Chemical Engineering","volume":"42 1","pages":"121 - 131"},"PeriodicalIF":2.9,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142906066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0