Numerical study of oxy-fuel combustion behaviors in a 2MWe CFB boiler
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Numerical study of oxy-fuel combustion behaviors in a 2MWe CFB boiler You Ra Gwak*, Jin Han Yun**, Sang In Keel**, and See Hoon Lee*,† *Department of Mineral Resources and Energy Engineering, Jeonbuk National University, 567, Bakje-daero, Jeonju-si, Jeollabuk-do 54896, Korea **Environment System Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, Korea (Received 2 April 2020 • Revised 5 June 2020 • Accepted 8 June 2020)
AbstractUsing modified IEA-CFBC(International Energy Association-Circulating fluidized bed combustion) model, a 2 MWe oxy-fuel CFBC boiler is simulated and analyzed as a promising solution to reduce greenhouse gas emission from coal power plants. This study evaluated and compared the oxy-combustion characteristics of various coals. Also, the effects of CO2 concentration (71-79 vol%), bed temperature (850 oC) and coal properties on combustion efficiencies, CO2 concentration, acid gas emissions were analyzed. Because of their higher N2 and S content, sub-bituminous and bituminous coals were found to have SOx and NOx concentrations higher than those of anthracite. These simulation results from Oxy-fuel CFBC simulation of various coals can be used as operating parameters for design and development of commercial Oxy-fuel CFBC boilers. Keywords: Circulating Fluidized Bed, Oxy Combustion, Anthracite, Coal, Computational Simulation
have been regarded as economical fuels for them. Since power generation relies so heavily on PC or CFB power stations, CO2 emissions resulting from coal combustion have increased CO2 concentration in the atmosphere, causing changes in global climate and increasing the earth’s temperature and sea level. As a result, many countries have been attempting to reduce greenhouse gas emissions from fossil fuels [1], including the development of CO2 capture and storage (CCS) technologies divided into pre-combustion, post-combustion, and oxy-fuel combustion for fossil power plants. Oxy-fuel combustion in particular can minimize the energy conversion penalty and CO2 carbon capture avoidance and can also be applied to existing power plants as well as new ones [9,10]. The term “Oxy-fuel CFBC” technology refers to the application of pure oxygen-fired combustion to existing CFB and CCS technologies. Oxy-fuel CFBC has been evaluated as suitable for global power generation because it has the advantages both of CFB technology and oxy-fuel combustion. For this reason, in addition to labscale studies of pure oxygen, CFB boiler technology studies have also attempted to gradually increase its scale to 30 MWth scale oxyfuel CFBC processes [4,10-18]. The studies performed so far, however, have involved only lab-scale or pilot-scale plants mostly using bituminous coals [6,18]. Moreover, the operating performance and characteristics of oxy-fuel CFBC change in response to external factors such as fuel supply volume, gas injection volume, and operating temperature. Under
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