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主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
水处理用活性炭的多膛炉再生工艺与效果研究
  • Title

    Study on regeneration process and effect of activated carbon for water treatment in multiple hearth furnace

  • 作者

    解炜段超陆晓东麻荣福李小亮韩璐

  • Author

    XIE Wei,DUAN Chao,LU Xiaodong,MA Rongfu,LI Xiaoliang ,HAN Lu

  • 单位

    煤炭科学技术研究院有限公司 煤化工分院中国矿业大学(北京) 化学与环境工程学院北京市煤基节能环保炭材料重点实验室煤炭资源高效开采与洁净利用国家重点实验室国家能源煤炭高效利用与节能减排技术装备重点实验室神华新疆能源有限责任公司

  • Organization
    1.Coal Chemistry Branch,China Coal Research Institute,Beijing ,China;2.School of Chemistry and Environment Engineering,China University of Mining and Technology (Beijing),Beijing ,China; 3.Beijing Key Laboratory of Coal Based Carbon Materials,Beijing ,China;4.State Key Laboratory of Coal Mining and Clean Utilization,Beijing ,China; 5.National Energy Technology &Equipment Laboratory of Coal Utilization and Emission Control,Beijing ,China; 6.Shenhua Xinjiang Co.,Ltd.,Urumqi ,China
  • 摘要

    我国是世界上煤基活性炭消费量最高的国家,尤其在水处理领域使用量最大。若直接将饱和、失效的水处理用活性炭直接废弃,不仅是资源的浪费,还会造成二次污染等问题。热再生是饱和活性炭最有效的再生手段,多膛炉所具有的温控准确、炉内气氛可调、自动化程度高的优势,是理想的再生装备,但目前国内利用多膛炉处理水处理用活性炭再生工艺并不明确,再生效果也尚未可知。基于此,利用实验室回转炉研究饱和水处理用活性炭的再生工艺条件,再应用工业级多膛炉装置进行生产,并调节关键工艺参数,将其与再生产率、再生后活性炭碘值、强度等关联,优化再生工艺。结果表明:在多膛炉470~917 ℃的升温区间内,再生后活性炭碘值由再生前的546 mg/g提升至995 mg/g,吸附性能恢复了97.5%,优于实验室回转炉的再生效果;多膛炉底层炉膛的再生终点温度是其再生工艺的关键参数,再生后活性炭的碘值随着再生终温的降低而减小,而强度相应增加。多膛炉再生终点温度810 ℃条件下,再生后活性炭碘值达到917 mg/g,其强度达到了95.1%,再生产率约为73%。多膛炉的弱氧化性气氛条件下,少量O2促进了活性炭孔隙内有机质的氧化、分解,提高了再生后活性炭的吸附性能。同时,高温条件下O2不可避免地会烧蚀活性炭,导致再生产率及再生后活性炭强度较低。

  • Abstract
    China has the highest consumption of coal-based activated carbon in the world,especially in the field of water treatment.If saturated or ineffective activated carbon for water treatment has been abandoned without recycled,not only is a waste of resources,but also will cause secondary pollution and other problems.Thermal regeneration is the most effective regeneration method for saturated activated carbon.Multiple hearth furnace has the advantages of accurate temperature control,adjustable atmosphere in the furnace,and high degree of automation,it is ideal thermal regeneration equipment for saturated activated carbon.However,the regeneration process and regeneration effect of saturated activated carbon for water treatment by multiple hearth furnace are not clear.The thermal regeneration process conditions were initially explored by the laboratory rotary furnace,and then the industrial multiple hearth furnace was used for the thermal regeneration production.The key process parameters were adjusted and correlated with the regeneration yield,iodine value and hardness of the activated carbon after regeneration to optimize the regeneration process.The results show that the iodine value of activated carbon after regeneration is increased from 546 mg/g to 995 mg/g in the temperature range of 470~917 ℃, and the adsorption performance is recovered by 97.5%, which is better than the regeneration effect of laboratory rotary furnace; the regeneration end-point temperature of bottom furnace is the key parameter of regeneration process, and the iodine value of activated carbon after regeneration decreases with the decrease of regeneration end-point temperature,the strength increases accordingly. At 810 ℃, the iodine value of activated carbon reach 917 mg/g, the strength reach 95.1%, and the reprocessing rate is about 73%. Under the weak oxidizing atmosphere of multiple hearth furnace, a small amount of O2 promotes the oxidation and decomposition of organic matter in the pores of activated carbon, and improves the adsorption performance of regenerated activated carbon. Under high temperature,O2 will inevitably ablate the activated carbon, resulting in low reproduction rate and low strength of the regenerated activated carbon.
  • 关键词

    煤基活性炭水处理用活性炭饱和活性炭再生多膛炉

  • KeyWords

    coal-based activated carbon; activated carbon for water treatment;saturated activated carbon regeneration; multiple hearth furnace

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2016YFC0204100,2016YFB0600400);煤炭科学技术研究院科技发展基金(2019CX-Ⅱ-03)
  • 相关文章
  • 图表
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    • 回转炉试验装置

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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

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