摘要
氧气/甲烷摩尔比、操作负荷以及二氧化碳添加的研究对天然气非催化部分氧化转化炉运行优化和调节合成气氢气/一氧化碳摩尔比非常重要。文中搭建了天然气非催化部分氧化热模实验平台,考察了上述因素对出口合成气组成的影响。在研究范围内得出以下结论:氧气/甲烷摩尔比从0.85增加到1.10,出口甲烷摩尔分数随之降低,有效合成气(一氧化碳+氢气)摩尔分数先增大后减小,在氧气/甲烷摩尔比为0.95时达到最大值87.75%;由于壁面热损失和停留时间的影响,提升操作负荷有利于提高有效合成气摩尔分数,但会导致甲烷转化率下降;添加的二氧化碳参加了逆水蒸气变换反应及甲烷二氧化碳重整反应,使合成气中一氧化碳摩尔分数随二氧化碳/甲烷摩尔比的增加而增加,氢气的变化趋势则与之相反。
The O2/CH4 mole ratio,operation load and carbon dioxide addition to natural gas non-catalytic partial oxidation reformer are of great importance to optimize the reformer operation and adjust the syngas H2/CO mole ratio. The effects of those factors on the syngas composition were studied by hot model experiment platform of natural gas non-catalytic partial oxidation. The results show that the increase of O2/CH4 mole ratio from 0.85 to1.10,and then the mole fraction of methane decreases. The mole fraction of effective syngas（ CO ＋ H2） decreases after a first increase,and then reaches maximum 87.75% when the mole ratio of O2/CH4 is 0. 95. For the comprehensive effects of wall heat loss and residence time,the rise of methane operation load can improve the mole fraction of effective syngas,but resulting in decline in methane conversion. The added carbon dioxide participates in the reactions of reverse water gas shift and methane carbon dioxide reforming. Thus,the increase of the mole ratio of CO2/CH4 results in the increase of the mole fraction of CO and the decrease of the mole fraction of H2.
出处
《化学工程》
CAS
CSCD
北大核心
2016年第5期60-64,69,共6页
Chemical Engineering(China)
基金
中央高校基本科研业务费专项资金(WB1213004)
关键词
甲烷
非催化部分氧化
热模实验
二氧化碳添加
methane
non-catalytic partial oxidation
hot-model experiment
CO2 addition
