Coal Electrochemical Conversion in Solid Oxide Direct Carbon Fuel Cell (SO-DCFC)

Transcription

1 oal Electrochemical onversion in Solid Oxide Direct arbon Fuel ell (SO-DF) Prof. Dr. Ningsheng ai Deputy director of Department of Thermal Engineering at Tsinghua University; Deputy director of both National Engineering Research enter of lean oal ombustion Expert group leader for heavy-duty gas turbine grand project; Expert group member of grand project for demonstration of coal poly-generation system Assistant Prof. Dr. Yixiang Shi Assistant professor in Department of Thermal Engineering at Tsinghua University. urrent research activities include direct carbon fuel cell, solid oxide fuel cell, SOF/GT hybrid system and IG polygeneration systems evaluation. ollaboration: Prof. Ahmed F. Ghoniem from MIT Prof. B.A. Glowacki and Prof. V. Kumar from ambridge University

2 oal based SO-DFs Solid Fuel oal, oke Liquid Fuel Natural Gas Hydrogen Under development Increasing complexity of fuel processing and decreasing efficiency Gasification Gas cleaning S-Removal onversion to H 2 /O H 2 /O Shift Reaction O Selective Oxidization oal-based SOF 500 o ~1000 o H-based SOF 500 o ~1000 o SOF Thermal Reformer 500 o ~1000 o MF Thermal Reformer 600 o PAF (O<5%) 200 o PEMF (O<5ppm) 80 o Solid Oxide electrolyte DFs Electronic conductor Electronic conductorcathode Electrolyte anode Ionic conductor cathode Electrolyte anode Ionic conductor arbon particle arbon arbon particle arbon e - O e - O 2 e - 0 Lc Le La v Abundant fuel source; easy for storage and transport; v High theoretical efficiency and energy density; v High reaction activities with high operating temperature; v No needs for noble metal catalysts; x O 2 O 2 Needs for performance and operation stability improvement O 2 N. F. Brandon, S. Skinner, B.. H. Steele, Annu. Rev. Mater. Res :183~213

3 Proposed Research researches ontent Goal: High efficiency, clean, cost-effective way for coal direct electrochemical conversion to electricity Research focus: l Reaction mechanism: larify the carbon electrochemical oxidation mechanisms in SO-DF l Performance improvement: Effects of fuel type, operating conditions, contaminant compositons on the cell performance l Reactor design: Novel oal-based SO-DF proto type design, fabrication and optimization

4 Research framework Ni 2e - Mass transfer O O 2 Gasification Electrochemical oxidization YSZ Fuel inducing tube athode current collector Thermo-couple Voltage (V) Pt mesh Sealing interface Fuel eramic plate Button cell Alumina tube inducing tube chamber Anode current collector 850 o 830 o 805 o 775 o 735 o l Proto type design and optimization (Enhancement of heat and mass transport by using fluidized-bed carbon electrode ) 0.2 O l oupling effects of carbon electrochemical oxidation and gasification urrent Density (ma/cm 2 ) l Performance analysis and improvement, especially considering introducing ionic conductor catalyst Validation Feedback Mutli-physical modeling at different time-space scales (ollaboration with Prof. Ahmed F. Ghoniem- MIT, Prof. B.A. Glowacki and Prof.V. Kumar - ambridge)

5 R&D of DF in Department of Thermal Engineering, Tsinghua University Experimental setup Elementary reaction DF modeling H 2O H 2 O 2 O 2 O O2 Mass flowmeter 0 500sccm heck athode gas Anode gas ZAHNER IM6ex Electrochemical Workstation ounter Reference Performance improvement (adding K, Ni, a salt) Bubbling fluidized bed electrode design N2 flowmeter heck athode vent Test Sence 6 Ar flowmeter heck irculating cooling water Gas chromatography H2 O2 flowmeter heck Mass 0 50sccm flowmeter heck Anode vent Triple _ ondenser Drying tube