Formed Coking Through The Copreheattreatment With Additive

The co-preheattreatment of non-fusible and slightly fusible coals with A240 and hydrogenated A240high temperature-short contact-time conditions around 500 C has been examined in an attemptto produce a formed coke with anisotropic development. These conditions shortened thecopreheat-treatment time and provided better anisotropic development in the resultant coke aftercarbonization. Effectiveness of short contact-time has been examined interms of the extent ofdepolymerization of coal molecules suitable for anisotropic developmentthis being相关coal liquefaction under similar conditions.The carbonization properties ofweathered bituminous coals compared with those of the non-weathered coals. the weatheringdecreased the fusibility of the coal to leave more basic anisotropy and to diminish the size of themajority of the anisotropy in the resulting coke. On the other hand，domain and flow domain textures developed. Co-carbonization with a petroleum pitch additive was domain and flow domain textures developed. cocarbonization with a petroleum pitch additive wasfound effective enhancing the fusibility of the coal and anisotropic development in the coke。形式coking of the weathered coal by means of copreheat-treatment with the additive，provided an anisotropic, dense and strong coke of uniform size. For the weathered coal，optimum copreheat-treat-ment was shorter than that using the non-weathered coalindicating high coking reactivity of the weathered coal. transferable hydrogens from theadditive are the oxygen containing groups of the weathered coal。

The co-preheattreatment of non-fusible and slightly fusible coals with A240 and hydrogenated A240 under high temperature-short contact-time conditions around 500 ゜C has been examined in an attempt to produce a formed coke with better anisotropic development. These conditions shortened the copreheat-treatment time and provided better anisotropic development in the resultant coke after carbonization. Effectiveness of short contact-time has been examined interms of the extent of depolymerization of coal molecules suitable for anisotropic development, this being related to coal liquefaction under similar conditions.The carbonization properties of weathered bituminous coals were compared with those of the non-weathered coals. The weathering decreased the fusibility of the coal to leave more basic anisotropy and to diminish the size of the majority of the anisotropy in the resulting coke. On the other hand, more domain and flow domain textures developed. Co-carbonization with a petroleum pitch additive was found effective enhancing the fusibility of the coal and anisotropic development in the coke. Formed coking of the weathered coal by means of copreheat-treatment with the additive, provided an anisotropic, dense and strong coke of uniform size. For the weathered coal, the optimum copreheat-treat-ment was shorter than that using the non-weathered coal, indicating high coking reactivity of the weathered coal. The transferable hydrogens from the additive are rapidly consumed by the oxygen containing groups of the weathered coal.