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Gaseous emission and ash characteristics from combustion of high ash content antibiotic mycelial residue in fluidized bed and the impact of additional water vapor

机译：流化床中高灰分抗生素菌丝体残留物燃烧产生的气体排放和灰分特性以及额外水蒸气的影响

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摘要

The gas (mainly NO and SO2) emission and ash characteristics from combustion of high ash content antibiotic mycelial residue (AMR) rich in N and S were investigated using a laboratory scale fluidized bed combustor, and the effects of addition of water vapor studied at the same time. The tested combustion temperature, excess air ratio (alpha) and mass ratios of water vapor-to-fuel (WV/F) varied in 750-950 degrees C, 1.3-1.9 and 0.4-1.4, respectively. Without additional water vapor present, both the concentrations of NO and SO2 in flue gas increased with elevating combustion temperature and excess air ratio, corresponding to the increases in conversion ratio of fuel-N to NO and emission ratio of S. The addition of water vapor facilitated excavating organic matters in the ash to result in its lower C and N contents. Additional water vapor formed partial reducing atmospheres, which were characterized by high CO and H-2 concentrations in combustion atmosphere and low valence S in the ash, to thus visibly reduce NO. The SO2 concentration became slightly lower at the presence of additional water vapor and further decreased with more water vapor addition. Additional water vapor strengthened capture of SO2 by the ash. Higher WV/F ratios led to more porous structures in ash, accountable for NO reduction by catalytic effect as well as SO2 absorption. Nevertheless, it seems less possible to reduce NO and SO2 concentrations to meet their respective emission criteria, and other measures will thus have to be taken to control their emissions when directly combusting AMR for energy recovery. (C) 2017 Elsevier Ltd. All rights reserved.
机译：使用实验室规模的流化床燃烧器研究了高氮含量和高硫含量的高灰分抗生素菌丝体残留物（AMR）燃烧产生的气体（主要为NO和SO2）排放和灰分特性，并在实验室研究了添加水蒸气的影响同时。测试的燃烧温度，水蒸气与燃料的过量空气比（α）和质量比（WV / F）分别在750-950摄氏度，1.3-1.9摄氏度和0.4-1.4摄氏度之间变化。在不存在额外的水蒸气的情况下，烟道气中NO和SO2的浓度均随燃烧温度的升高和空气过量比的增加而增加，这对应于燃料-N转化为NO的比例和S的排放比的增加。有助于挖掘灰烬中的有机物，从而降低其C和N含量。额外的水蒸气形成部分还原性气氛，其特征在于燃烧气氛中高的CO和H-2浓度以及灰分中的低价S，从而可见地还原NO。在存在额外的水蒸气的情况下，SO2浓度会略有降低，而在添加更多水蒸气的情况下，SO2浓度会进一步降低。额外的水蒸气增强了灰分对SO2的捕获。较高的WV / F比值导致灰分中出现更多的多孔结构，这是由于催化作用以及SO2吸收而导致的NO减少。然而，减少NO和SO2浓度以满足各自的排放标准似乎不太可能，因此，当直接燃烧AMR进行能量回收时，必须采取其他措施来控制其排放。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Fuel》 |2017年第15期|66-77|共12页
  • 作者

    Zhang Guangyi; Liu Huan; Ge Yaxin; Gao Shiqiu;

  • 作者单位

    Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China|Chinese Acad Sci, Chengdu Organ Chem Co Ltd, Chengdu 610041, Sichuan, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fluidized bed combustion; NOx; SO2; Ash; Antibiotic mycelial residue; Water vapor;

    机译：流化床燃烧;NOx;SO2;灰分;抗生素菌丝体残留;水蒸气;

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