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Past (2008~2015)

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Solid oxide based DCFC system

Project
Experimental setup (Solid oxide based DCFC system)
Electrochemical performance of FB system Design features of CFB system
  • Hybrid형 (gasifying DCFC)
  • Internal circulating fluidized bed
  • Ceramic tubular SOFC base
  • CO2 recycle for a CDU application
  • Better fuel flexibility (low grade coal, biomass)
  • Optical access for visualization

Effect of coal recycle on coal combustion

Project
Coal combustion visualization in CFB system Gas based analysis
Mass based analysis Calculation of combustion efficiency

Ignition and extinction behavior in gas oven burner

Project
Experimental setup Delay time of hot surface ignition
Schlieren images of hot surface ignition

Ignition analysis

Project

Extinction analysis

Project
Why hybrid broil burner Experimental setup
  • Hybrid broil burner : 화염이 넓은 면적의 metal mesh나 ceramics 등 radiation plate에 직접 충돌되면서 기존 버너에 비해 열전달 중 radiation heat flux를 증가시키고자 함
  • 이때 flame-wall interaction에 의해 소염이 발생하여 CO가 증가하는 경향이 나타남 : Quenching effect(kinetics), flame stretch effect, vortex downstream effect
  • 이의 검증을 위해 burner system 및 충돌물체의 단순화 필요: 소염시의 화염/경계층 위치 및 구조, 온도, CO 발생과의 연관성 확인, 소염한계에 미치는 주요 설계 인자 영향분석
Results (flame structure)

Analysis and experiment for combustion of low rank coal

Project
Background Ash reburning technology
Temperature distribution (from simulation) CO distribution
Effect of chemical structure of a single coal and its blending (low rank coal)
Coal combustion analyzers (Lab scale)
Effect of pressure effect on particle reaction and convection heat loss
  • To investigate the pressure effect on reaction and heat transfer during various operating conditions including coal gasification, combustion, devolatilization and etc.
  • Pressure : up to 25 atm
  • Temperature: 800-1500K
  • Reactants: CO2 and H2O, O2, N2
  • Heating rates: up to 105 K/sec
  • Nth order or L-H kinetics
  • Multistep gasification mechanisms and its kinetic parameters
Pressurized WHR Pressurized LFR