HWAHAK KONGHAK, Vol.17, No.6, 389-396, December, 1979
무연탄 연소반응기구 및 수식모델
A Study on the Combustion Mechanism of Anthracite Coal and Mathematical Modeling
초록
석탄의 연소반응은 반응경계면이 이동하는 비촉매 불균일반응으로 본 연구에서는 가정용 연료인 구공탄의 해석키 위한 기초연구로서 환상시린더형의 기하학적 구조를 갖고 있는 1구멍탄 고체시료를 이용하여 국산무연탄의 연소기구를 해석하였다. 수식모델은 반응경계면에서 평형반응과 1차반응의 두가지 가정을 사용하여 Unreacted-Core Shrinking Model을 기초로 한 물질수지 및 열수지식을 세웠다. 실험결과를 이론값과 비교하므로서 700 ℃이상의 온도에서는 평형반응 가정이 타당하며, 600 ℃이하의 온도에서는 반응표면에서 1차반응으로 보는 것이 타당함을 알 수 있었다.
In this study, the combustion mechanism of Korean anthracite coal has been studied. The combustion is a typical noncatalytic heterogeneous reaction of the unreacted-core shrinking nature. The geometry of the reacting substance employed was an annulus cylinder which could simulate, "Gugong-tan", multi-hole coal briquette, used for a residential fuel in Korea.
The theoretical solutions for the mass and heat balance equations derived from the unreacted-core shrinking model were obtained under two different assumptions, the reaction equilibrium and the first order reaction at the reacting surface.
The experimental results, obtained with pelletized 30∼60 mesh anthracite were compared with the theoretical solutions. For the temperature higher than 700 ℃, the results agreed well with the equilibrium assumption, while the results were better fitted to the first order reaction for the temperature lower than 600 ℃.
The theoretical solutions for the mass and heat balance equations derived from the unreacted-core shrinking model were obtained under two different assumptions, the reaction equilibrium and the first order reaction at the reacting surface.
The experimental results, obtained with pelletized 30∼60 mesh anthracite were compared with the theoretical solutions. For the temperature higher than 700 ℃, the results agreed well with the equilibrium assumption, while the results were better fitted to the first order reaction for the temperature lower than 600 ℃.