PVC化学链燃烧过程中二噁英生成研究

毕文卓; 赵瑞东; 陈天举; 武景丽; 吴晋沪

PVC化学链燃烧过程中二噁英生成研究

1.
中国科学院青岛生物能源与过程研究所中国科学院生物燃料重点实验室, 山东青岛 266101;
2.
中国科学院大学, 北京 100049

基金项目: 国家重点基础研究发展规划(973 计划, 2011CB201502); 中国博士后科学基金(2014M551978)。

详细信息

通讯作者:
赵瑞东, 吴晋沪

中图分类号: TQ546
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- 被引次数: 0
出版历程
- 收稿日期: 2015-02-15
- 修回日期: 2015-05-06
- 刊出日期: 2015-07-30

Study on the formation of PCDD/Fs in PVC chemical looping combustion

1.
Qingdao Institute of Bio Energy and Process, Chinese Academy of Sciences Key Laboratory of Bio Fuels, Chinese Academy of Sciences, Qingdao 266101, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 制备了负载硅溶胶的CaSO₄载氧体,并对其与CH₄、CO和H₂的反应特性进行了研究表征。采用管式炉实验系统,对PVC在基于CaSO₄载氧体的化学链燃烧和空气燃烧两种方式下,二噁英的生成特性进行了实验研究。结果表明,负载了硅溶胶的CaSO₄载氧体与CH₄、CO和H₂反应均接近完全转化,其中,与CH₄和H₂的反应时间显著短于CO。采用化学链燃烧方式可有效抑制PVC燃烧过程二噁英的生成,其生成量和毒性当量分别由空气燃烧中的34 172.5 pg/g及732.8 pg(I-TEQ)/g降到化学链燃烧的2 270.9 pg/g及290.2 pg(I-TEQ)/g,这主要是因为化学链燃烧过程中燃料与O₂不直接接触,显著减少了大分子碳结构的氧化断裂以及HCl向Cl₂的转化,从而抑制了二噁英的低温从头合成反应和前驱物生成反应。
- 化学链燃烧 /
- 二噁英 /
- PVC /
- 载氧体 /
- CaSO₄
Abstract: CaSO₄ oxygen carriers with silica sol were prepared and their reaction performances with CH₄, CO and H₂ were experimentally investigated. The formation characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in PVC combustion by means of chemical looping combustion (CLC) based on CaSO₄ oxygen carrier and air were studied in a tube furnace system. The results show that CaSO₄ oxygen carriers with silica sol can be completely reduced by CH₄, CO and H₂. The reaction time of CH₄ and H₂ is much shorter than CO. The chemical looping combustion of PVC can effectively inhibit the formation of PCDD/Fs. The yield and International Toxicity Equivalent Quantity (I-TEQ) of PCDD/Fs produced in CLC are 2 270.9 pg/g and 290.2 pg(I-TEQ)/g, much lower than those in air combustion which are 34 172.5 pg/g and 732.8 pg(I-TEQ)/g. It is mainly because fuel doesn't directly contact with O₂ in CLC, the oxidative cleavage of large carbon molecule and the conversion from HCl to Cl₂ are significantly reduced which will inhibit the low temperature de novo synthesis and precursors reaction of PCDD/Fs.
- chemical looping combustion /
- PCDD/Fs /
- PVC /
- oxygen carrier /
- calcium sulfate

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