CAJ | 학술논문

利用新疆长焰煤为原料在2 MW等离子体热解煤制乙炔中试装置上进行热解实验时反应器壁上有结焦物生成.为了有助于实验中减少乃至避免它们的生成,通过SEM以及XRD方法对这些结焦物进行了研究.结果表明:位于反应器不同部位处的结焦物具有不同的微观形貌.在此基础上推测了结焦物的生成机理,即混合段壁侧结焦物通过铜的催化作用生成,第1以及第2反应段壁侧结焦物由煤粉碎片所组成;相应的气体侧结焦物则分别通过气-固、气-固以及焦油的吸附/去氢反应生成.结焦物的石墨化程度往下游方向逐渐增强,这一现象由结焦物自身石墨化属性所决定.
이용신강장염매위원료재2 MW등리자체열해매제을결중시장치상진행열해실험시반응기벽상유결초물생성.위료유조우실험중감소내지피면타문적생성,통과SEM이급XRD방법대저사결초물진행료연구.결과표명:위우반응기불동부위처적결초물구유불동적미관형모.재차기출상추측료결초물적생성궤리,즉혼합단벽측결초물통과동적최화작용생성,제1이급제2반응단벽측결초물유매분쇄편소조성;상응적기체측결초물칙분별통과기-고、기-고이급초유적흡부/거경반응생성.결초물적석묵화정도왕하유방향축점증강,저일현상유결초물자신석묵화속성소결정.
The carbon deposits were formed on the reactor wall during plasma pyrolysis of Xinjiang candle coal in the 2 MW plasma pyrolysis pilot-plant. To make for reducing or avoiding their formation during the experiment, these carbon deposits were studied by the scanning electronic microscope (SEM) and X-ray diffraction (XRD) methods. The result shows that the carbon deposits located at different parts in the reactor present a distinguishing microscopic pattern, and their formation mechanism is deduced. The wall-side carbon deposits of the mixing sector are formed through copper catalysis, while wall-side carbon deposits of the first and second reaction sectors are composed of coal powder fragments. The gas-side carbon deposits accordingly are formed by gas-solid, gas-solid and tars absorption/dehydrogenation reaction respectively. The graphitization degree of the carbon deposits increases downwards, which depends on their own graphitization property.