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SNCR De-NOx within a moderate temperature range using urea-spiked hydrazine hydrate as reductant

机译：使用尿素水合肼作为还原剂在中等温度范围内进行SNCR脱硝

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摘要

In this research, urea-spiked hydrazine hydrate solutions are used as reductants for the Selective Non Catalytic Reduction (SNCR) De-NOX process below 650 degrees C. The urea concentration in the urea/hydrazine hydrate solutions is chosen through experimental and theoretical studies. To determine the mechanism of the De-NOx process, thermogravimetric analysis (TGA) of the urea/hydrazine hydrate solutions and their thermal decomposition in air and nitrogen atmospheres were studied to understand their decomposition behaviours and redox characteristics. Then a plug flow reactor (PFR) model was adopted to simulate the De-NOx processes in a pilot scale tubular reactor, and the calculated De-NOX efficiency vs. temperature profiles were compared with experimental results to support the mechanism and choose the proper reductant and its reaction temperature. Both the experimental and calculated results show that when the urea is spiked into hydrazine hydrate solution to make the urea-N content approximately 16.7%-25% of the total N content in the solution, better De-NOX efficiencies can be obtained in the temperature range of 550-650 degrees C, under which NH3 is inactive in reducing NOX. And it is also proved that for these urea-spiked hydrazine hydrate solutions, the hydrazine decomposition through the pathway N2H4 + M = N2H3 + H + M is enhanced to provide radical H, which is active to reduce NO. Finally, the reaction routes for SNCR De-NOR process based on urea-spiked hydrazine hydrate at the proper temperature are proposed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在这项研究中，尿素加标的水合肼溶液用作650℃以下的选择性非催化还原（SNCR）脱硝工艺的还原剂。尿素/水合肼溶液中的尿素浓度是通过实验和理论研究选择的。为了确定脱硝过程的机理，研究了尿素/肼水合物溶液的热重分析（TGA）及其在空气和氮气气氛中的热分解，以了解其分解行为和氧化还原特性。然后采用推流反应器（PFR）模型来模拟中试规模管式反应器中的De-NOx过程，并将计算出的De-NOX效率与温度曲线与实验结果进行比较，以支持该机理并选择合适的还原剂及其反应温度。实验和计算结果均表明，将尿素加标到水合肼溶液中使尿素-N含量约为溶液中总氮含量的16.7％-25％时，在该温度下可获得更好的脱氮效率。温度范围为550-650摄氏度，在此温度下，NH3不能还原NOX。并且还证明，对于这些掺有尿素的肼水合物溶液，通过N 2 H 4 + M = N 2 H 3 + H + M途径的肼分解被增强以提供自由基H，该自由基具有还原NO的活性。最后，提出了在适当温度下，尿素水合肼基SNCR De-NOR工艺的反应路线。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Chemosphere》 |2016年第10期|208-218|共11页
  • 作者

    Chen H.; Chen D. Z.; Fan S.; Hong L.; Wang D.;

  • 作者单位

    Tongji Univ, Thermal & Environm Engn Inst, Shanghai 200092, Peoples R China;

    Tongji Univ, Thermal & Environm Engn Inst, Shanghai 200092, Peoples R China;

    Tongji Univ, Thermal & Environm Engn Inst, Shanghai 200092, Peoples R China;

    Tongji Univ, Thermal & Environm Engn Inst, Shanghai 200092, Peoples R China;

    Tongji Univ, Thermal & Environm Engn Inst, Shanghai 200092, Peoples R China|Shanghai Univ Elect Power, Inst Energy & Environm Engn, Shanghai 200090, Peoples R China;

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

    SNCR De-NOX; Hydrazine hydrate; Urea-spiked; Concentration; Temperature window;

    机译：SNCR-NOX;水合肼;加尿素;浓度;温度范围;

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