SOLID OXIDE fuel CELL HYBRID SYSTEM

• Developing a next-generation power generating system to achieve extremely high efficiency beyond 70%.

• Using an internal combustion engine as a bottoming cycle of solid oxide fuel cell.

• Finding the optimized design for this combined system.

• Exploring the operation of system when fuelled by ammonia.

• Exploring the use of this system in ships and locomotives.

• Funded by KRRI, 2023-2025.

• Minkyoung(민경) is working on this project.

SOLID OXIDE CELL WITH THERMAL BATTERY

• Developing highly efficient hydrogen and power production system using reversible solid oxide cell and thermal battery.

• Using hot blast stove as a thermal battery.

• Funded by K-Water, 2022-2023 and 2024-2027.

• Hyewon(혜원) was working on this work.

• Huiju(희주) and Dajung(다정) are working on this work.

SOLID OXIDE fuel CELL DEGRADATION MODELING AND LIFETIME PREDICTION

• Modeling the degradation of solid oxide cell.

• Developing the lifetime prediction method of solid oxide cell.

• Funded by KETEP, 2023-2025.

• Nayoung(나영) and Seowoo(서우) are working on this project.

Solid oxide cell degisn optimization

• Designing the flow channel for solid oxide cell according to its purpose.

• Using FLUENT and COMSOL simulation model to find the optimum design and verifying the design with experimental test station.

• Funded by KRRI, 2023-2025.

• Funded by K-Water, 2024-2027.

• Huiju(희주), Dajung(다정), and Nayeon(나연) are working on this work.

solid oxide cell-thermal battery system

Hyewon Hwang, Yehyeong Lim, and Wonjae Choi

Energy Conversion and Management, 2024. 

• A novel system - a reversible solid oxide cell system with a thermocline-type thermal energy storage is proposed 

• The proposed system achieves a 27.5% improvement in efficiency over the solid oxide electrolysis stand-alone system. 

• The proposed system could achieve 0 kg-CO2-eq/kg-H2 of greenhouse gas emission 

• The proposed system can reduce a hydrogen production cost from $5.15/kg-H2 to $3.03/kg-H2.

ENGINE OPERATION IN SOFC-ENGINE HYBRID SYSTEM

Wonjae Choi, Jaehyun Kim, Yongtae Kim, Seonyeob Kim, Sechul Oh, and Han Ho Song

Applied Energy, 2018. DOI: 10.1016/j.apenergy.2018.07.086

• Engine operation in the hybrid system is experimentally analysed for the first time.

• HCCI engine is experimented while varying the operating conditions of the system.

• HCCI engine yields a significant amount of power while emitting very low NOx emission.

• It has been found how each system control parameter affects HCCI engine operation.

• System operating conditions enabling successful HCCI engine operation are identified.

SOLID OXIDE FUEL CELL OPERATION IN SOFC-ENGINE HYBRID SYSTEM

Wonjae Choi, Jaehyun Kim, Yongtae Kim, and Han Ho Song

Applied Energy, 2019. DOI: 10.1016/j.apenergy.2019.113681

• System operation is analysed by combining experimental results and simulation models.

• SOFC should utilize anode inlet gas with low external reforming rate and temperature.

• Pressure pulsation caused by the engine is insignificant for the SOFC operation.

• Operational design point is determined considering performance and stability.

• 59% efficiency and near-zero pollutant emissions are achieved at the design point.

NEW HEAT TRANSFER CORRELATION FOR THE ENGINE IN THE HYBRID SYSTEM

Wonjae Choi and Han Ho Song

Energy, 2020. DOI: 10.1016/j.energy.2020.117851

• Excessive engine heat losses were analysed to be caused by unusual gas composition.

• The ‘composition-considered Woschni’ heat transfer correlation was newly proposed.

• To validate the correlation, experiments and simulations of the engine were conducted.

• The new correlation showed much improved predictivity for engine performance.

• The correlation can also be used to simulate engines using other unusual fuels.