排序方式: 共有5条查询结果,搜索用时 15 毫秒
1
1.
Effects of cooling methods on stability and methane conversion rate using dielectric-barrier discharges (DBD) were systematically investigated in this article. The results showed that the methane conversion rate was as high as 44.43% in a pure methane system at a flow rate of 100 mL·min^-1 and an input power of 234.2 W with air cooling. A dark greenish and soft film-like carbon was deposited on the outer surface of quartz tube when the outer electrode was watercooled, which decreased the methane conversion. With air cooling of inner electrode the selectivity of C2 hydrocarbons was higher than that with other cooling methods, while the C3 hydrocarbons had higher selectivity with flowing water cooling. Cooling the inner electrode could restrain the carbon deposition, but would decrease the methane conversion rate. The stability of both reaction and plasma operation can be improved through cooling the reactor. From thermodynamic analysis, it was found that the effective collisions frequency among the reactant molecules and free electrons (e^-) increased with temperature, which in turn led to a higher methane conversion rate and a change in the distribution of products. 相似文献
2.
阐述了介质阻挡放电(DBD)等离子体的基本特性、放电机理、理论模型、反应器类型及存在问题。评述了介质阻挡放电在物质合成、挥发性有机物处理、汽车尾气净化、材料表面处理、催化剂改性、沉积制膜以及等离子体催化协同作用在环境化工中的应用等方面的研究进展,分析了传统方法在这些方面应用的优缺点,指出通过与催化剂协同可以更好地发挥等离子体的优势。DBD等离子体技术在节约能源、降低成本、安全操作和环境保护等方面都有很大改进,是一种很有前途的新技术,并展望了DBD等离子体技术的发展前景和研究方向。 相似文献
3.
运用4个介质阻挡放电反应器,考察了甲烷介质阻挡放电等离子体转化过程中,高压电极位置、放电间隙、内电极形式、氢气与甲烷的体积比、空气冷却方式等因素对甲烷转化率和产物分布的影响。实验结果表明,高压加于外电极时甲烷的转化率明显低于加于内电极时甲烷的转化率;对外电极进行空气冷却后,反应温度升高速率变缓,可将反应温度控制在理想范围(60~150℃)内,同时可获得较高的甲烷转化率,且操作安全。反应器参数对甲烷转化率有明显的影响,而对产物分布影响不显著,主要产物为乙烷、乙烯和丙烷。在反应系统中加入氢气,在氢气与甲烷的体积比为1.50时,C2烃选择性为74.50%。 相似文献
4.
5.
为应对气候变化,开展低碳化变革将成为可持续发展的重要抓手。低成本可再生能源发电与氢能、碳捕集等技术深度耦合,是未来能源技术革命和产业发展的重要方向。绿色低碳发展已成为未来主旋律,通过构建氢电耦合产业发展格局,可充分发挥清洁能源在产业绿色低碳升级中的示范作用,以及在低碳技术创新应用中的主体作用。总结了近年来能源结构优化及工业低碳经济转型的迫切需求;分析了新型的“工业+绿氢”低碳发展模式;探讨了能源承载型绿氢化工产业发展可行方向,以助力低碳乃至零碳产品供给;进一步对低碳技术应用于零碳园区创建进行了展望。 相似文献
1