摘要
低温等离子体裂解技术具有原料适应性强、启停迅速、工艺流程短、无碳排放等优点,适用于石油烃高效裂解制备氢气和乙炔等应用。该文选择正癸烷为石油烃模型化合物,研究鼓泡式液相脉冲火花放电裂解正癸烷的放电稳定性和转化规律。实验结果表明,极不均匀电场、高电压、高脉冲频率、高载气流速有利于提升液相火花放电稳定性。随反应进行出现气泡内放电、微气泡放电、气相区域放电3种放电阶段,放电稳定性和产气速率依次增大。考察处理时间、载气流速对正癸烷转化的影响,最大产气速率为124.4mL/min,其中氢气含量为64.1%,乙炔含量为21.0%,产氢能耗为6.1kW∙h/m^(3)。液相火花放电光谱以C_(2)、H_(α)为主,气体温度约为3500K,电子密度约为1.15×10^(17)cm^(-3),推测主要反应过程为等离子体激发正癸烷逐步裂解脱氢。该结果对液相放电稳定性和石油烃高效转化等研究具有一定参考。
The non-thermal plasma cracking technology has the advantages of wide feedstocks adaptability,quick start-up and close-down,short processing flow and non-carbon emission,which is applicable to petroleum cracking for hydrogen and acetylene.In this work,n-decane was used as the model compound of petroleum,and the characteristics of liquid spark discharge were studied in a bubble reactor.The results show that nonuniform electrode configuration,higher voltage,higher pulse frequency and faster carrier gas flow rates were in favor of discharge stability.As the plasma cracking reactions proceeded,the spark discharge took place in a bubble at first,then in microbubbles,and finally in gaseous products,of which the discharge stability and gaseous products flow rate increased in turn.The effects of treatment time and carrier gas flow rate on n-decane conversion were also investigated.The maximum of gaseous products flow rate was 124.4 mL/min(64.1%H_(2) and 21.0%C_(2)H_(2))with the hydrogen production energy consumption of 6.1 kW∙h/m^(3).The optical emission spectra mainly consisted of C_(2) and H_(α),by which the gas temperature was estimated at about 3500 K and electron density was about 1.15×10^(17) cm^(-3).These results suggest that the gradual dehydrogenation process of n-decane excited by spark plasma is the main reaction pathways.This work provides a reference for improving liquid discharge stability and petroleum hydrocarbons utilization.
作者
范喆
孙昊
张帅
章程
韩伟
邵涛
FAN Zhe;SUN Hao;ZHANG Shuai;ZHANG Cheng;HAN Wei;SHAO Tao(Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion,Institute of Electrical Engineering,Chinese Academy of Sciences,Haidian District,Beijing 100190,China;University of Chinese Academy of Sciences,Shijingshan District,Beijing 100049,China;Sinopec Research Institute of Petroleum Processing,Haidian District,Beijing 100083,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第22期7861-7870,共10页
Proceedings of the CSEE
基金
国家自然科学基金(重点项目)(51637010)
国家自然科学基金(青年科学基金项目)(52007179)
国家杰出青年科学基金项目(51925703)。
关键词
微秒脉冲放电
液相火花放电
放电稳定性
正癸烷裂解
microsecond pulsed discharge
liquid spark discharge
discharge stability
n-decane cracking
