[논문]0.1 MWth 급 순환유동층에서의 무연탄 연소 전산유체역학 모사

고은솔; 국진우; 서광원; 서수빈; 김형우; 강서영; 이시훈

doi:10.9713/kcer.2021.59.3.417

0.1 MWth 급 순환유동층에서의 무연탄 연소 전산유체역학 모사
Anthracite Oxygen Combustion Simulation in 0.1MWth Circulating Fluidized Bed 원문보기

Korean chemical engineering research = 화학공학, v.59 no.3, 2021년, pp.417 - 428

고은솔 (전북대학교 환경에너지융합학과) , 국진우 (경원테크) , 서광원 (경원테크) , 서수빈 (전북대학교 자원에너지공학과) , 김형우 (전북대학교 환경에너지융합학과) , 강서영 (전북대학교 자원에너지공학과) , 이시훈 (전북대학교 환경에너지융합학과)

초록
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낮은 반응성으로 인해 복잡한 공정이 필요한 무연탄은 순환유동층 내의 동적 거동을 통해 연소 특성이 고찰되어야 한다. Pilot 규모의 0.1MW_th 급 순산소 순환유동층 연소로에서의 무연탄 연소 특성을 고찰하기 위하여 본 연구에서는 전산유체해석 기법을 이용하였다. 순산소 순환유동층 보일러는 연소로(0.15 m l.D., 10 m High), 싸이클론, 재순환부 등으로 구성되었고 동일한 크기의 3D 모델 반응기를 구축하였다.실험에 사용한 무연탄은 평균 입도 1,070 ㎛, 밀도 2,326 kg/m³이다. 공기 연소에서 순산소 연소로의 연소 환경 변화에 따른 반응기 내부의 기-고 흐름 패턴을 고찰하였다. 이때, 공기 연소와 순산소 연소에서 온도 분포는 비슷한 양상을 보이지만 압력 분포는 순산소 연소에서 더 낮음을 알 수 있었다. 더불어 공기 연소에 비해 순산소 연소에서 더 높은 CO₂ 농도를 가지므로 이산화탄소 포집이 활발히 이루어질 것을 예상해 볼 수 있다. 결과적으로 본 연구를 통해 무연탄 활용 시 순환유동층 반응기의 최적화된 설계 및 운전에 기여할 수 있음을 확인하였다.

Abstract ▼ AI-Helper

The combustion characteristics of anthracite, which follow a complex process with low reactivity, must be considered through the dynamic behavior of circulating fluidized bed (CFB) boilers. In this study, computational fluid dynamics (CFD) simulation was performed to analyze the combustion characteristics of anthracite in a pilot scale 0.1 MWth Oxy-fuel circulating fluidized bed (Oxy-CFB) boiler. The 0.1MWth Oxy-CFB boiler is composed of combustor (0.15 m l.D., 10 m High), cyclone, return leg, and so on. To perform CFD analysis, a 3D simulation model reactor was designed and used. The anthracite used in the experiment has an average particle size of 1,070 ㎛ and a density of 2,326 kg/m3. The flow pattern of gas-solids inside the reactor according to the change of combustion environment from air combustion to oxygen combustion was investigated. At this time, it was found that the temperature distribution in air combustion and oxygen combustion showed a similar pattern, but the pressure distribution was lower in oxygen combustion. addition, since it has a higher CO2 concentration in oxygen combustion than in air combustion, it can be expected that carbon dioxide capture will take place actively. As a result, it was confirmed that this study can contribute to the optimized design and operation of a circulating fluidized bed reactor using anthracite.

주제어

표/그림 (13)

표 Table 1. Governing equations for gas-solid phase [42]
표 Table 2. Coal combustion chemical reaction kinetic [41]
그림 Fig. 1. Schematic diagram of the 0.1MW_th CFB boiler.
표 Table 3. Geometry of the combustor and cyclone of the 0.1 MWth CFB boiler
표 Table 4. Simulation conditions for the air fired and oxy fired CFB
그림 Fig. 2. Temperature profile by height in air and oxy fired condition (a) comparison of anthracite and sub-bituminous coal in air fired condition, (b) comparison of anthracite and sub-bituminous in oxy fired condition, (c) comparison of anthracite in air and oxy fired condition.
그림 Fig. 3. Temperature distribution of gas and particle phase in the CFB (a) air fired condition, (b) oxy fired condition.
표 Table 5. Proximate and ultimate analysis of the coals [12]
그림 Fig. 4. CFB and full loop pressure distribution profile in air and oxy fired condition.
그림 Fig. 5. Solid hold up profile with height of air and oxy fired condition.
그림 Fig. 6. CFB full loop CO₂ concentration distribution (a) air fired condition, (b) oxy fired condition.
그림 Fig. 7. Full-loop distribution of solid and gaseous species involved in the coal combustion process (a) air fired condition, (b) oxy fired condition.
그림 Fig. 8. CO₂/O₂ concentration profile according to riser height (a) air fired condition, (b) oxy fired condition.

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표제어: PCR

동의어: Packet Collision Rate

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