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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第10期    总第254期    2015年10月

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文章编号:1672-7207(2015)10-3603-08
硫对焦空气反应性的影响及钙硫的相互抑制作用与机理
肖劲,仲奇凡,邓松云,赖延清,李劼,刘业翔

(中南大学 冶金与环境学院,湖南 长沙,410083)

摘 要: 以二苯并噻吩、硫酸铵和稀硫酸为硫添加剂,以多种含钙化合物为钙添加剂对低杂质沥青进行掺杂,在550 ℃和1 100 ℃下制备含Ca,S杂质的半焦前驱体和沥青焦,研究空气反应中S对焦反应性的影响以及Ca与S之间的相互作用关系,并结合扫描电镜(SEM)和能谱(EDS)对其中的机理进行了探讨。研究结果表明:有机S对焦的空气反应性具有比Ca更强的催化作用,但当S和Ca同时存在于沥青焦中时,它们却会对彼此的催化作用表现出一种很强的相互抑制效果;S的催化机理极有可能是因为它在焦的表面上形成一个可直接增加焦的消耗并具有放热特性的循环反应体系;Ca与S之所以能够相互抑制很可能是因为它们生成相对稳定的CaSO4并通过其引发的一系列反应破坏了S的催化性循环反应体系平衡。

 

关键字: 焦;空气反应性;硫杂质;钙杂质;作用机理

Mechanism and effect of sulfur on coke air reactivity and mutual restrain between calcium and sulfur
XIAO JIN, ZHONG Qifan, DENG Songyun, LAI Yanqing, LI Jie, LIU Yexiang

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:Using dibenzothiophene, ammonium sulfate and dilute sulphuric acid as S-additives, and some kinds of calcium compounds as Ca-additives, S and Ca contaminated semi-coke precursor and pitch coke were prepared at 550 ℃ and 1 100 ℃ separately. The effect of S on coke reactivity and interaction between Ca and S during coke air reaction were studied. Their corresponding mechanisms were investigated with SEM and EDS. The results show that organic S acts as a stronger catalyst for the coke air reactivity than Ca. However, when both S and Ca exist in pitch coke, they restrain the catalysis of each other strongly. S has catalysis probably because it can make a cyclic reaction system with coke consumption increasing and heat releasing on the coke surface. Ca and S restrain the catalysis of each other probably because they can form stable CaSO4 and trigger a series reactions to destroy the catalytic cyclic reaction system of S.

 

Key words: coke; air reactivity; sulfur impurity; calcium impurity; mechanism of action

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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