摘要
为了控制煤直接化学链燃烧中多环芳烃(PAHs)的生成,减少载氧体表面的积碳现象,在模拟化学链燃烧反应器中,采用机械混合法制备的CaSO_4/膨润土载氧体与煤发生化学链燃烧反应,利用气相色谱仪对PAHs进行定性和定量分析,研究了不同煤种、不同温度、不同载氧体/煤比例PAHs的排放特征。结果表明,随挥发分的增加,不同煤种生成的PAHs总量分布依次为:无烟煤<烟煤1<烟煤2<烟煤3。煤中含碳量、H/C摩尔比、O/C摩尔比对PAHs的生成也有一定的影响。化学链燃烧反应主要生成2环、3环芳烃,4环、5环芳烃相对较少,均没有生成6环芳烃。当温度为900℃,载氧体/煤为2.4时,CaSO_4/膨润土载氧体与烟煤3反应生成的PAHs总量最少。
To control the formation of polycyclic aromatic hydrocarbons （PAHs） and reduce the carbon deposition phenomenon on the surface of oxygen carrier,the mechanical mixing method to prepare CaSO4/bentonite oxygen carrier was adopted to react with coal in a simulated chemical-looping combustion （CLC） fuel reactor.Gas chromatography was employed for qualitative and quantitative analysis on PAHs.The emission characteristics of PAHs were discussed at different coal types,temperatures and oxygen carriers/coal ratios.The results show that with the volatile increasing,the total amount of PAHs formation at different coal types is in the order as anthracite〈 bituminous coal 1 〈 bituminous coal 2〈 bituminous coal 3.PAHs formation is also influenced by carbon content,n （H）/n （C） and n （O）/n （C） ratio.In the CLC process,2-ring and 3-ring PAHs are predominant as 4-ring and 5-ring PAHs are relatively small,while 6-ring PAHs is not produced.When the temperature is 900 C and oxygen carrier/coal ratio is 2.4,the total amount of PAHs formation is the least in the reaction of CaSO4/bentonite oxygen carrier and bituminous coal 3.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2017年第7期1854-1862,共9页
Journal of China Coal Society
基金
国家自然科学基金青年科学基金资助项目(21107040)
科技部"农业科技成果转化资金"资助项目(2014GB2A400088)
关键词
煤
化学链燃烧
多环芳烃
CaSO4/膨润土载氧体
积碳
coal
chemical-looping combustion
polycyclic aromatic hydrocarbons
CaSO4/bentonite oxygen carrier
carbon deposition
