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Implementation of circulating fluidized bed (CFB) boilers in the energy sector has witnessed a steady increase owing to their afforded advantages of operational flexibility in terms of compliance with several low-grade fuels and in-situ DeSOx and DeNOx capabilities. In recent years, the rise in global warming and development of intermittent power-generation technologies have stressed the need for development of techniques to afford high-efficiency low-emission (HELE) power-generation, effective carbon capture and storage, and flexible operation of thermal power plants. To meet these demands, the Future Energy Plant Convergence Research Center (FEP CRC) has investigated oxy-combustion technologies for CFB boilers that use low-grade fuels with calorific values <5000 kcal/kg while maintaining high operational efficiency and low pollutant emission. Of key interest in this study is the operation of the proposed system under rapid load variations over a wide operating range, including an oxy-combustion test with high oxygen concentration more than 40% within oxidants. Efforts in this regard are underway through pilot experiments performed using demonstration-scale facilities and multidimensional numerical simulations. Additionally, studies have been performed to identify materials for use in the said high-efficiency boilers and develop techniques for exhaust-system water recovery. In this paper, the current conclusions from the research activities of FEP CRC will be presented.
Changwon Yang; YoungDoo Kim; Byeongryeol Bang; Soohwa Jeong; Jihong Moon; Tae-Young Mun; Sungho Jo; Jaegoo Lee; Uendo Lee. Oxy-CFB combustion technology for use in power-generation applications. Fuel 2020, 267, 117206 .
AMA StyleChangwon Yang, YoungDoo Kim, Byeongryeol Bang, Soohwa Jeong, Jihong Moon, Tae-Young Mun, Sungho Jo, Jaegoo Lee, Uendo Lee. Oxy-CFB combustion technology for use in power-generation applications. Fuel. 2020; 267 ():117206.
Chicago/Turabian StyleChangwon Yang; YoungDoo Kim; Byeongryeol Bang; Soohwa Jeong; Jihong Moon; Tae-Young Mun; Sungho Jo; Jaegoo Lee; Uendo Lee. 2020. "Oxy-CFB combustion technology for use in power-generation applications." Fuel 267, no. : 117206.
Oxy-combustion with a circulating fluidized bed (Oxy-CFBC) can facilitate the separation of high CO2 concentration and reduce emissions by biomass co-firing. This study investigated Oxy-CFBC characteristics such as temperature, solid hold-up, flue gas concentrations including CO2, pollutant emissions (SO2, NO, and CO), combustion efficiency and ash properties (slagging, fouling index) with increasing input oxygen levels (21–29 vol%), and biomass co-firing ratios (50, 70, and 100 wt% with domestic wood pellet). The possibility of bio-energy carbon capture and storage for negative CO2 emission was also evaluated using a 0.1 MWth Oxy-CFBC test-rig. The results show that combustion stably achieved with at least 90 vol% CO2 in the flue gas. Compared to air-firing, oxy-firing (with 24 vol% oxygen) reduced pollutant emissions to 29.4% NO, 31.9% SO2 and 18.5% CO. Increasing the biomass co-firing from 50 to 100 wt% decreased the NO, SO2 and CO content from 19.2 mg/MJ to 16.1 mg/MJ, 92.8 mg/MJ to 25.0 mg/MJ, and 7.5 mg/MJ to 5.5 mg/MJ, respectively. In contrast to blends of sub-bituminous coal and lignite, negative CO2 emission (approximately −647 g/kWth) was predicted for oxy-combustion only biomass.
Hoang Khoi Nguyen; Ji-Hong Moon; Sung-Ho Jo; Sung Jin Park; Myung Won Seo; Ho Won Ra; Sang-Jun Yoon; Sung-Min Yoon; Byungho Song; Uendo Lee; Chang Won Yang; Tae-Young Mun; Jae-Goo Lee. Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig. Energy 2020, 196, 117020 .
AMA StyleHoang Khoi Nguyen, Ji-Hong Moon, Sung-Ho Jo, Sung Jin Park, Myung Won Seo, Ho Won Ra, Sang-Jun Yoon, Sung-Min Yoon, Byungho Song, Uendo Lee, Chang Won Yang, Tae-Young Mun, Jae-Goo Lee. Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig. Energy. 2020; 196 ():117020.
Chicago/Turabian StyleHoang Khoi Nguyen; Ji-Hong Moon; Sung-Ho Jo; Sung Jin Park; Myung Won Seo; Ho Won Ra; Sang-Jun Yoon; Sung-Min Yoon; Byungho Song; Uendo Lee; Chang Won Yang; Tae-Young Mun; Jae-Goo Lee. 2020. "Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig." Energy 196, no. : 117020.
This study aims to optimize the oxy-circulating fluidized bed combustion (oxy-CFBC) process by reducing the amount of flue gas with high-purity carbon dioxide. To achieve this, the stable transition from air mode to oxy mode is tested and validated in a 0.1-MW oxy-CFBC test rig. The results prove that flue gas carbon dioxide separation can achieve 96 vol.% (dry) through a stable transition from air mode to oxy mode. Moreover, flue gas production emitted in oxy mode is reduced to one fifth compared to air mode. The proven technologies and oxy-fuel combustion database from this test rig operating experience can be used as empirical operating parameters for the next steps such as demonstration and commercial-scale operation.
Ji-Hong Moon; Sung-Ho Jo; Sung Jin Park; Nguyen Hoang Khoi; Myung Won Seo; Ho Won Ra; Sang-Jun Yoon; Sung-Min Yoon; Jae-Goo Lee; Tae-Young Mun. Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed. Energy 2018, 166, 183 -192.
AMA StyleJi-Hong Moon, Sung-Ho Jo, Sung Jin Park, Nguyen Hoang Khoi, Myung Won Seo, Ho Won Ra, Sang-Jun Yoon, Sung-Min Yoon, Jae-Goo Lee, Tae-Young Mun. Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed. Energy. 2018; 166 ():183-192.
Chicago/Turabian StyleJi-Hong Moon; Sung-Ho Jo; Sung Jin Park; Nguyen Hoang Khoi; Myung Won Seo; Ho Won Ra; Sang-Jun Yoon; Sung-Min Yoon; Jae-Goo Lee; Tae-Young Mun. 2018. "Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed." Energy 166, no. : 183-192.