Model modification for calcium looping system for post combustion CO2 capture

Abstract

The average temperature of the globe has increased over the past 100 years and the carbon dioxide of the post combustion flue gas from fossil fuel consumption is the main cause for climate change. To reduce carbon dioxide from post combustion, a number of technologies have been studied to date. Herein, the calcium looping process to remove carbon dioxide from post combustion by cyclic adsorption-desorption through two fluidized bed reactors is discussed. In the reference model, the adsorption of carbon dioxide was modeled with a 2-phase model based on particle residence time of fluidized bed reactor. Since the model was based on an ideal flow pattern in the modeling process, additional nonidealities need to be considered. Thus, the attempt to improve the accuracy of prediction of actual operation results is conducted by introducing non-ideality parameter into the reference models. As a result of the model modification, 90% adsorption is achieved with the height of fluidized bed reactor and flow rate of sorbent recirculation being lower.|지구 평균 기온은 지난 100년간 증가하였고 화석 연료의 소비에서 기인한 연소 후 가스의 이산화탄소는 기후변화에 대한 주 원인으로 지목되고 있다. 이산화탄소 배출 감소를 위해 다양한 협약들이 체결되었으며 이 협약의 이행을 위한 연소 후 이산화탄소 저감을 위한 기술 역시 연구되고 있다. 이산화탄소 포집을 위한 기술 중, 두 개의 유동층 반응기를 통해 흡탈착을 반복하는 방법을 통해 연소 후 이산화탄소를 제거하는 칼슘 순환 흡착공정을 본 논문에서는 다루었다. 기준 모델에서는 유동층 반응기의 입자 체류시간에 기반한 두 개의 상 모델로 연소 후 이산화탄소 흡착을 모델링 하였으나, 이상적인 흐름 패턴을 기반으로 하였기 때문에 비이상성에 대한 추가적인 고려가 필요하다. 본 연구에서는 기존 모델에 유동층 흐름의 패턴에 기반한 비이상성을 고려한 파라미터 도입을 통해 실제 운전 결과에 대한 예측 정확도를 높이고자 하였고, 실제 실험 결과와의 비교를 통해 이를 검증하였다. 모델 수정을 통해 90% 흡착을 더 낮은 유동층 반응기 높이와 낮은 흡착제 순환 유량으로 성취, 경제적 이득을 얻을 수 있음을 확인하였다.; The average temperature of the globe has increased over the past 100 years and the carbon dioxide of the post combustion flue gas from fossil fuel consumption is the main cause for climate change. To reduce carbon dioxide from post combustion, a number of technologies have been studied to date. Herein, the calcium looping process to remove carbon dioxide from post combustion by cyclic adsorption-desorption through two fluidized bed reactors is discussed. In the reference model, the adsorption of carbon dioxide was modeled with a 2-phase model based on particle residence time of fluidized bed reactor. Since the model was based on an ideal flow pattern in the modeling process, additional nonidealities need to be considered. Thus, the attempt to improve the accuracy of prediction of actual operation results is conducted by introducing non-ideality parameter into the reference models. As a result of the model modification, 90% adsorption is achieved with the height of fluidized bed reactor and flow rate of sorbent recirculation being lower.