油页岩干馏瓦斯中的丙烯组分在不同耐热合金上的积炭特性

The Carbon Deposition Characteristics of Propylene in Oil Shale Retorting Gas on Different Heat-Resistant Alloys

采用自制的连续流动反应装置,分别以2520及316L不锈钢管为反应器,对不同气体流量（20、30、40 m L/min）、不同壁温（700、750、800℃）、恒定反应时间（20min）条件下干馏瓦斯中丙烯组分在不同反应器内的积炭特性的实验结果表明,两种管壁上初始积炭温度范围分别为630~650℃及670~690℃;扫描电镜对积炭微观形态观察表明,管内积炭都以丝状炭和无定形炭为主;程序升温氧化方法对不同工况下两种反应管内积炭量分析得出,316L耐热合金具有抗金属粉化特性;热重及差示扫描量热法对管内剥离炭样活性的表征结果证实,316L耐热合金内积炭活性比2520耐热合金内的高。

An experimental research for the carbon deposition characteristics of propylene in oil shale retorting gas was carried out under different conditions including temperatures（ 700,750 and 800 ℃）,gas flow（ 20,30 and40 m L / min） and constant time（ 20min） by a home-made continuous flow reactor system. Different reactors made by2520 and 316 L stainless steel tubes were used. The results showed that the initial carbon deposition temperature range was 630 - 650 ℃ and 670 - 690 ℃ for 2520 and 316 L,respectively. The carbon deposition morphology observed by SEM indicated that no matter 2520 or 316 L there were two species of carbon,i. e. filamentous carbon and amorphous carbon. The amount analysis of carbon deposition under different conditions by TPO methods showed that 316 L had a characteristic of metal powder resistance. The results of the TG / DSC analyses for carbons stripped proved that the carbon deposition activity of 316 L stainless steel is higher than that of 2520 stainless steel.