介质阻挡放电辅助甲烷蒸汽重整的实验研究

Experimental Study of the Dielectric Barrier Discharge-aided Steam Reforming of Methane

利用介质阻挡放电辅助甲烷蒸汽重整试验平台进行了大量试验,基于试验数据系统地分析了350-500℃温度下蒸汽甲烷摩尔比(S/C)、反应物驻留时间、壁面温度及输入功率等对甲烷转化率、有效碳回收率及产物选择性等指标的影响规律,并考察了不同影响因素之间的相互作用关系。研究发现:驻留时间对各指标的影响最为明显,在不同壁面温度下,随着驻留时间的增加,产物选择性出现转折性变化,由60%左右下降到20%左右;与驻留时间的影响不同,随着输入功率或S/C的增加,重整特性的各评价指标均呈现缓慢增长趋势;而温度对等离子体辅助甲烷蒸汽重整结果是否有影响与驻留时间、输入功率等参数有关,只有当驻留时间大于0.59 s时,温度对重整反应的影响变得较小,且当输入功率也大于80 W时,温度对重整反应不再有影响。

With a great number of experiments performed by making use of an dielectric barrier discharge( DBD)-aided methane steam reforming test rig and based on the test data thus obtained,systematically analyzed was a law governing the influence of the steam /methane molar ratio( S /C),reactant residence time,wall surface temperature and input power etc. on the methane conversion rate,effective carbon recovery rate and product selectivity etc. indexes and investigated was the correlation of various influencing factors at temperatures from 350 ℃ to 500 ℃. It has been found that the residence time has a most remarkable influence on various indexes. At different wall surface temperatures,with an increase of the residence time,the product selectivity will change with a turning point,declining from about60% to around 20%. Different from the influence of the residence time,various indexes for evaluating the reforming characteristics will all assume a slow growth tendency with an increase of the input power or S /C. Whether or not the temperature will affect the steam reforming of methane aided by the plasma is relevant to the residence time and input power etc. parameters. Only when the residence time is longer than 0. 59 seconds,will the influence of the temperature on the reforming reaction become relatively small. In addition,when the input power is also greater than80 W,the temperature will no longer affect the reforming reaction.