CAJ | 학술논문

以氧化钙做为催化剂和CO2化学固定剂,详细考察了Ca/C摩尔比、反应温度﹑停留时间、压力等条件对泥炭在超临界水中转化的影响.在723 K,Ca/C摩尔比为0.46时,CO2被完全固定,在气相产物中只有氢气、甲烷和低碳烃,碳转化率由未添加CaO时的68.73%提高到85.36%.CaO能够促进泥炭的裂解,并对烃类的重整反应和水煤气变换反应起到催化作用.液相产物的收率在723 K达到极大值,在36.5 MPa,液相产物的收率是热解条件下的3倍,随着停留时间的延长,液相产物中的极性组分发生分解.
이양화개주위최화제화CO2화학고정제,상세고찰료Ca/C마이비、반응온도﹑정류시간、압력등조건대니탄재초림계수중전화적영향.재723 K,Ca/C마이비위0.46시,CO2피완전고정,재기상산물중지유경기、갑완화저탄경,탄전화솔유미첨가CaO시적68.73%제고도85.36%.CaO능구촉진니탄적렬해,병대경류적중정반응화수매기변환반응기도최화작용.액상산물적수솔재723 K체도겁대치,재36.5 MPa,액상산물적수솔시열해조건하적3배,수착정류시간적연장,액상산물중적겁성조분발생분해.
The effects of the addition of CaO, temperature and residence time on the conversion and product yields of a high-ash peat in supercritical water was investigated. The experiments were carried out in an autoclave in the temperature range of 623 K～773 K at pressure up to 30 MPa. At a Ca/C molar ratio of 0.46, almost no CO2 remained in gas phase. It was found that CaO facilitates the extraction of volatile matter from peat and the decomposition of volatile matter to small molecular compounds. Moreover, CaO catalyses the steam reforming reaction of hydrocarbons and the water-shift reaction. The addition of KOH might favor the reforming reaction of oil product to hydrogen and carbon dioxide. Furthermore, the yield of oil reaches a maximum at the temperature approximately 723K. A threefold increase in the yield of oil product was observed under 36.5 MPa compared with pyrolysis. However, the polar compounds decomposed with the prolongation of reaction time.