基于NTP的生物质热解气间接加氢提质试验研究

Experiment on Indirect Hydrogenation Upgrading of Biomass Pyrolysis Vapors Based on NTP

为提高生物质热解气的提质转化效率,以聚乙烯塑料热解气为间接加氢原料,利用低温等离子体(Non-thermal plasma,NTP)协同Ru、Ti及Sn改性HZSM5,间接加氢生物质热解气制备烃类燃料,探讨了金属改性对反应中活性自由基、有机相产率、理化特性与化学组成以及催化剂结焦率的影响。结果表明,在NTP条件下,Ru和Ti改性可以活化热解气,形成更多同尺度活性自由基,有利于混合热解气的有效整合,其中,Ti改性使有机相产率和高位热值分别达到58.73%和38.73 MJ/kg;Ru、Ti和Sn改性使有机相中芳香烃相对含量显著升高,升幅分别为109.15%、208.55%和52.52%,Ru和Ti改性导致产物有效氢碳比降低;Ru、Ti和Sn改性催化剂的结焦率从12.88%分别降至9.44%、4.95%和10.91%,Ti改性催化剂具有较高的稳定性。研究表明,在NTP作用下,Ti改性HZSM5对混合热解气具有较高的提质转化效率,且催化稳定性较高。

In order to effectively improve the upgrading efficiency of biomass pyrolysis vapors,polyethylene pyrolysis volatiles were used as indirect hydrogenation material,and indirect hydrogenation upgrading of biomass pyrolysis vapors was conducted over HZSM5 and its Ru,Ti and Sn modified versions to prepare bio-fuels.Besides,non-thermal plasma(NTP)technology was introduced to enhance the conversion process.The effects of metal modifications on the active radicals,organic phase yields,properties and compositions,and catalyst coking rates were explored.The results showed that under the action of NTP,the Ru and Ti modified species enhanced the formation of active radicals and activated more volatiles into the same radical scale,contributing to the integration of mixed vapors.Particularly,the yield and high heating value of organic phase by using TiHZ5 reached 58.73%and 38.73 MJ/kg,respectively.The modification of Ru,Ti and Sn significantly increased the relative contents of aromatic hydrocarbons in the organic phase,which were increased by 109.15%,208.55%and 52.52%,respectively,resulting in a decrease in the effective hydrogen to carbon ratio distribution of the product.In addition,the coking rates of Ru,Ti and Sn modified HZSM5 were decreased from 12.88%to 9.44%,4.95%and 10.91%,respectively.And Ti modification significantly improved the stability of catalyst.In general,under the action of NTP,Ti modified HZSM5 had higher conversion efficiency and higher catalytic stability.