Lagrangian기법과 Eulerian기법을 이용한 미분탄 연소 과정 모델링

Abstract

미분탄 연소 특성 해석을 하기 위한 방법으로 크게 Eulerian-Lagrangian 기법과 Eulerian-Eulerian 기법이 있다. 본 연구에서는 Eulerian-Lagrangian 기법과 Eulerian-Eulerian기법의 미분탄 연소 특성 해석 모델에 관하여 jet화염에 대해 수치해석을 수행하였다. 또한 수치해석 결과를 실험결과와 비교 검증하고, 수치해석 결과를 바탕으로 각각의 기법에 관하여 해석능력, 정확도, 계산효율 및 물리 모델이나 수치적인 문제점에 대한 한계점에 관해 분석하였다. 석탄 연소로 내부를 수치적으로 모델링 하는 것은 많은 복잡한 과정을 요구하기 때문에 현재로서는 두 가지 기법에 대해 아주 만족스러운 결과를 보이지 않았으며, 보다 나은 신뢰성 있는 해석결과를 얻기 위하여 향후 탈휘발화 및 char 산화반응 등의 물리모델의 개선에 관한 연구가 필요할 것으로 사료된다.|The numerical models dealing with pulverized coal combustion can be categorized by both Eulerian-Lagrangian and Eulerian-Eulerian formulation. In the present study, both coal combustion approaches are numerically implemented and validated against the experimental data of the pulverized coal jet flame in the horizontal chamber. Based on numerical results, the detailed discussions are made for the comparative performance, accuracy, computational efficiency, and limitation of physical and numerical models. Numerical results indicate that these two coal-combustion procedures have a reasonably good capability to numerically simulation the complex coal combustion processes in the real pulverized coal combustor. Although the preliminary results obtained in this study are encouraging, numerical and experimental researches for improving physical models especially for devolatilization and char oxidation processes need to be systematically performed for developing the reliable and efficient coal combustion model.; The numerical models dealing with pulverized coal combustion can be categorized by both Eulerian-Lagrangian and Eulerian-Eulerian formulation. In the present study, both coal combustion approaches are numerically implemented and validated against the experimental data of the pulverized coal jet flame in the horizontal chamber. Based on numerical results, the detailed discussions are made for the comparative performance, accuracy, computational efficiency, and limitation of physical and numerical models. Numerical results indicate that these two coal-combustion procedures have a reasonably good capability to numerically simulation the complex coal combustion processes in the real pulverized coal combustor. Although the preliminary results obtained in this study are encouraging, numerical and experimental researches for improving physical models especially for devolatilization and char oxidation processes need to be systematically performed for developing the reliable and efficient coal combustion model.