CAJ | 학술논문

以稻秆和松木为原料，采用恒温热重法对生物质新生半焦与冷态半焦的 CO2气化特性进行了对比研究。通过酸洗脱灰和对脱灰原料添加金属催化剂，分别从半焦结构和催化剂的角度探讨两种半焦气化反应性差异的成因，并采用混合模型进行了动力学分析。结果表明：新生半焦气化反应性明显大于冷态半焦。在冷却再升温过程中，半焦残留的有机官能团发生了进一步的断裂和重组，析出挥发分并生成更稳定的芳香结构；另一方面，半焦中金属催化剂晶型发生变化，金属元素与碳基质形成了更稳定的联接，使其催化活性减弱。新生半焦与冷态半焦气化反应活化能相差不大，但指前因子相差较大，这与两种半焦表面气化活性位点的数目有关。
이도간화송목위원료，채용항온열중법대생물질신생반초여랭태반초적 CO2기화특성진행료대비연구。통과산세탈회화대탈회원료첨가금속최화제，분별종반초결구화최화제적각도탐토량충반초기화반응성차이적성인，병채용혼합모형진행료동역학분석。결과표명：신생반초기화반응성명현대우랭태반초。재냉각재승온과정중，반초잔류적유궤관능단발생료진일보적단렬화중조，석출휘발분병생성경은정적방향결구；령일방면，반초중금속최화제정형발생변화，금속원소여탄기질형성료경은정적련접，사기최화활성감약。신생반초여랭태반초기화반응활화능상차불대，단지전인자상차교대，저여량충반초표면기화활성위점적수목유관。
The CO2 gasification characteristics of in-situ char and ex-situ char of biomass were comparatively investigated by using rice straw and pine as samples. Effects of char structure and metal catalyst on difference of the char gasification reactivity were explored by acid-washing and catalyst loading, respectively. Kinetic analysis was conducted with a hybrid model. The results show that, gasification reactivity of in-situ char is significantly higher than that of ex-situ char. During the process of cooling and reheating, the organic functional groups in char undergo further breakage and recombination, leading to volatilization and more stable aromatic structures. Besides, the morphology of metal catalyst is changed and more stable linkage may be formed between metal and char matrix, which deactivate the catalyst. Activation energy of the in-situ char and the ex-situ char are slightly different from each other, while the pre-exponential factors differ widely, which can be attributed to the numbers of active spot on char surface.