摘要
油气类挥发性有机化合物(VOCs)是一类重要的大气污染物质。基于化学链燃烧原理,以油气类VOCs的代表性物质之一正己烷为处理对象,开展了正己烷的脱除实验研究。首先基于固定床反应器进行了正己烷与氧化态铜基载氧体的直接化学链燃烧反应实验,发现当反应温度低于350℃时,正己烷的脱除率和载氧体的还原利用率均较低,而将反应温度提高到400℃以上时,载氧体上产生了大量积炭,表明直接的化学链燃烧无法较好的脱除正己烷。为此,探索了先对正己烷进行水蒸气重整将其转化为易于化学链燃烧的H;和CO,然后再对H;和CO进行化学链燃烧,即耦合了水蒸气重整和化学链燃烧的方法。基于该方法的正己烷脱除实验中,发现在正己烷液相空速1.0 h;、水碳比1.0和反应温度高于420℃的条件下,在7.5 min时,正己烷脱除率和载氧体还原利用率均高于75%且无积炭发生,表明耦合了水蒸气重整的化学链燃烧工艺可较好的处理正己烷。载氧体的XRD表征结果表明,在本工艺的化学链燃烧反应中铜基载氧体的氧化态物种为CuO,而还原态物种为Cu。
Volatile organic compounds(VOCs) of gaseous oil are a kind of important air pollutants. Based on the principle of chemical-looping combustion, n-hexane, one of the representative substances of VOCs of gaseous oil, was treated as the object to carry out the experimental research on the removal of n-hexane. Firstly, the direct chemical-looping combustion reaction between the oxidative Cu-based oxygen carrier and n-hexane was carried out in a fixed bed reactor. It is found that when the reaction temperature is lower than 350 ℃, both of the removal ratio of n-hexane and the reduction utilization ratio of the oxygen carrier are low. And when the reaction temperature is raised up to 400 ℃ or higher, a large amount of carbon deposition is produced on the oxygen carrier, indicating that n-hexane can not be well removed by direct chemical-looping combustion. Therefore, an experimental route was explored that n-hexane is first steam reformed into H;and CO, which were easy to be treated by chemical-looping combustion,and then chemical-looping combustion of H;and CO was carried out. That is, a method combining steam reforming with chemicallooping combustion was adopted. In the experiment of n-hexane removal based on above method, it is found that under the conditions of liquid hourly space velocity of n-hexane is 1.0 h;, the steam/carbon ratio is 1 and reaction temperature is higher than 420 ℃,the removal ratio of n-hexane and the reduction utilization ratio of oxygen carrier are higher than 75% at 7.5 min, and no carbon deposition occurred, indicating that n-hexane can be treated with a process of chemical-looping combustion combined with steam reforming. The XRD characterization results of the oxygen carriers show that the oxidized species of the Cu-based oxygen carrier is CuO, and the reduced species is Cu in the chemical-looping combustion reaction of the process.
作者
唐霜
罗春欢
苏庆泉
TANG Shuang;LUO Chunhuan;SU Qingquan(School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Energy Conservation and Emission Reduction for Metallurgical Industry,University of Science and Technology Beijing,Beijing 100083,China)
出处
《天然气化工—C1化学与化工》
CAS
北大核心
2022年第3期48-54,共7页
Natural Gas Chemical Industry
基金
国家自然科学基金(51506005)
中央高校基本科研业务费资助项目(FRF-BD-20-09A)。
关键词
油气类VOCs
正己烷
化学链燃烧
水蒸气重整
脱除率
还原利用率
VOCs of gaseous oil
n-hexane
chemical-looping combustion
steam reforming
removal ratio
reduction utilization ratio
作者简介
第一作者:唐霜(1991—),硕士研究生,研究方向为油气类VOCs治理,E-mail:1325405414@qq.com;通讯作者:苏庆泉(1961—),博士,教授,研究方向为氢能与燃料电池技术、化学链燃烧技术,E-mail:suqingquan@ustb.edu.cn;通讯作者:罗春欢(1983—),博士,副教授,研究方向为吸收式热泵、化学链制氢及新能源系统技术,E-mail:luochunhuan@ustb.edu.cn。
