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HWAHAK KONGHAK,
Vol.36, No.5, 687-694, 1998
Vol.36, No.5, 687-694, 1998
고정층 반응기에서의 고온건식 탈황공정 모사에 관한 연구
A Study on the Simulation of High-Temperature Desulfurization Process in a Fixed-Bed Reactor
석탄가스에 포함되어 있는 황화수소를 제거하기 위한 우수한 탈황제로 아연계 및 철계 탈황제를 선정하였고, 이들 탈황제의 성능을 모사가스를 이용하여 고정층에서 400-700℃ 온도범위에서 평가하였다. 그리고, 고정층 실험에 의해 구해진 황화수소 파과곡선을 grain model과 unreacted core model을 이용하여, 유효확산계수를 조절 가능한 변수로 선택하여 fitting 하였다. 두 모델 모두 실험에 의해 구해진 파과곡선과 비교적 잘 일치되는 파과곡선을 보여주며, 이를 통해 각 탈황제에 대한 유효확산계수를 Arrhenius식 형태로 나타냄으로써 생성물층을 통한 확산에 대한 겉보기 활성화 에너지와 빈도인자를 구하였다.
Zinc and iron-based sorbents were considered as prime candidate sorbents to remove H2S in coal-derived gas. The performance of sorbents was tested at temperature range of 400-700℃ in a fixed-bed reactor using the simulated coal gas. Then, the effective product-layer diffusion coefficient, De was estimated from the best-fittings of the experimental breakthrough curves and simulated breakthrough curves by the grain model and unreacted core model, respectively. These two models showed that the predicted and experimental breakthrough curves were in good agreement. Apparent activation energies and frequency factors were obtained for the product-layer diffusion coefficient of various sorbents by plotting in Arrhenius form.
Keywords:
High Temperature Desulfurization; Grain Model; Unreacted Core Model; Effective Diffusivity; Zinc Oxide; Ferric Oxide; Copper Oxide; Fixed-Bed Reactor
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