Abstract
The conversion characteristics of anthracite and bituminous coal were studied under preheating by a circulating fluidized bed and deep gasification technology, revealing the conversion paths of preheated fuel and gasified fuel. The operating temperature and volatile content determined the conversion characteristics of raw coal. Compared with bituminous coal, the gasification reactivity of anthracite was lower, which was reflected in the higher conversion ratios of the main components for bituminous coal during preheating-gasification. However, the gasification reactivity increased after deep gasification for anthracite. The main factors of enhanced gasification reactivity included an increase of BET surface area, an expansion of pore structure, an increase of light aromatic rings and a decrease of graphitization degree. In addition, the pyrrolic nitrogen with a relatively stable structure was the main nitrogen functionality in preheated and gasified char. The main components of preheated tar were light polycyclic aromatic hydrocarbons and chain hydrocarbons. Furthermore, the nitrogen functionalities in preheated tar were nitrogen oxide and amine nitrogen for anthracite and bituminous coal, respectively. And the conversion ratio from fuel-nitrogen to tar-nitrogen was approximately 50%, which indicated that this conversion path was indispensable during preheating. Meanwhile, a complete conversion path of fuel-nitrogen was proposed during preheating-gasification.
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