Citation: BI Wen-zhuo, ZHAO Rui-dong, CHEN Tian-ju, WU Jing-li, WU Jin-hu. Study on the formation of PCDD/Fs in PVC chemical looping combustion[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(7): 884-889. shu

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

BI Wen-zhuo ^1,2 ,
ZHAO Rui-dong ^1,, ,
CHEN Tian-ju ¹ ,
WU Jing-li ¹ ,
WU Jin-hu ^1,,

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

Corresponding author: ZHAO Rui-dong, WU Jin-hu,
Received Date: 15 February 2015
Available Online: 6 May 2015
Fund Project: 国家重点基础研究发展规划(973 计划, 2011CB201502) (973 计划, 2011CB201502) 中国博士后科学基金(2014M551978)。 (2014M551978)

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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