付建英,李晓东,詹明秀,林晓青,陆胜勇,陈彤.生活垃圾循环流化床焚烧锅炉飞灰中二噁英热解析特性研究[J].环境科学学报,2015,35(6):1833-1841
生活垃圾循环流化床焚烧锅炉飞灰中二噁英热解析特性研究
- Thermal releasing characteristics of PCDD/Fs in fly ash from a circulating fluidized bed municipal solid waste incinerator
- 基金项目：国家重点基础研究发展计划(973)项目(No.2011CB201503);国家高技术研究发展计划(863)项目(No.2012AA062803);环保公益性行业科研专项资助项目(No.201209022)
- 付建英
- 1. 中国联合工程公司, 杭州 310052;2. 浙江大学热能工程研究所, 能源清洁利用国家重点试验室, 杭州 310027
- 李晓东
- 浙江大学热能工程研究所, 能源清洁利用国家重点试验室, 杭州 310027
- 詹明秀
- 浙江大学热能工程研究所, 能源清洁利用国家重点试验室, 杭州 310027
- 林晓青
- 浙江大学热能工程研究所, 能源清洁利用国家重点试验室, 杭州 310027
- 陆胜勇
- 浙江大学热能工程研究所, 能源清洁利用国家重点试验室, 杭州 310027
- 陈彤
- 浙江大学热能工程研究所, 能源清洁利用国家重点试验室, 杭州 310027
- 摘要：实际垃圾焚烧系统中飞灰会在尾部烟道堆积并在受热后发生二噁英的再生成、热降解及向烟气解析等协同作用.本文研究了半干法脱硫塔前生活垃圾焚烧飞灰在受热过程中二噁英的质量变化及其气固相分布情况,重点研究了反应温度、含氧量及硫胺基复合阻滞剂的添加等对飞灰中二噁英热解析特性的影响.试验结果表明,250 ℃时飞灰析出的气相二噁英很少,而450 ℃时气相二噁英的比例高达99.7%;氧含量对飞灰中二噁英的热解析特性影响较大,当氧含量为6%时,气相二噁英的析出量最大,达到2.87 ng · g-1;350 ℃时添加硫胺基复合阻滞剂后二噁英总量明显下降,表明阻滞剂能够抑制二噁英再合成,但气相中二噁英的比例从47.69%上升到87.50%.
- Abstract：PCDD/Fs can be resynthesized, released and destructed from fly ash at the post combustion zone of a municipal solid waste incinerator (MSWI). The fly ash aggregated before the semi-dry scrubber was collected from a circulating fluidized bed MSWI to simulate the mass-change of PCDD/Fs in gas and solid phase under laboratory thermal treatment condition. The influence of reaction temperature, oxygen content and addition of thiourea on thermal releasing characteristics of PCDD/Fs was also studied. The results show that almost no gaseous PCDD/Fs present in 250 ℃. When the fly ash is heated to 450 ℃, the ratio of gaseous PCDD/Fs increases to 99.7%. The oxygen content in the reaction atmosphere greatly influences the thermal releasing of PCDD/Fs from the fly ash. Most of the PCDD/Fs is released to the gas phase when the oxygen content is 6%. The gas phase concentration of PCDD/Fs is up to 2.87 ng · g-1. The addition of thiourea decreases the total concentration of PCDD/Fs in gas and solid phase, whereas the ratio of gaseous PCDD/Fs increases from 47.69% to 87.50%.
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