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Numerical simulation on operating parameters of SNCR process in a municipal solid waste incinerator

机译：SNCR工艺运行参数在城市垃圾焚烧炉中的数值模拟

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摘要

The combustion of municipal solid waste and ammonia based selective non-catalytic reduction (SNCR) process in a moving-grate incinerator was simulated based on the computational fluid dynamics method. The combustion characteristics, overall temperature level, NOX emission, NOX removal efficiency and NH3 slip were analyzed to determine the optimal SNCR injection positions, injection speeds and injection ratios. Results showed that there was no difference in the furnace temperature and O-2 concentration under different SNCR injection positions, speeds and ratios. Moreover, the temperatures of SNCR injection zones were in the SNCR reaction temperature range of 800 degrees C-1100 degrees C under different SNCR injection positions, speeds and ratios. Further, injection positions strongly affected NOX removal efficiency and NH3 slip. Ammonia should be injected in layer and in the front region within the suitable temperature range as much as possible. Furthermore, SNCR injection speed had an optimal speed, which was 13.80 m/s with NOX removal efficiency of 51.50% and NH3 slip of 11.08 mg/Nm(3). In addition, there was a strong impact on NOX removal efficiency and NH3 slip under different SNCR injection ratios. Increasing the ratio of SNCR-1 (the first row of SNCR) was conducive to the improvement of NOX removal efficiency. The best injection ratio was the ratio of 6: 3: 1 (SNCR-1: SNCR-2 (the second row of SNCR): SNCR-3 (the third row of SNCR)), where NOX removal efficiency was 53.10% and NH3 slip was 8.43 mg/Nm(3).
机译：基于计算流体动力学方法，模拟了移动式垃圾焚烧炉中城市固体废物和基于氨的选择性非催化还原（SNCR）过程的燃烧。分析燃烧特性，总体温度水平，NOX排放，NOX去除效率和NH3泄漏，以确定最佳的SNCR喷射位置，喷射速度和喷射比。结果表明，在不同的SNCR注入位置，速度和比例下，炉温和O-2浓度没有差异。此外，在不同的SNCR注入位置，速度和比例下，SNCR注入区的温度在800-1100℃的SNCR反应温度范围内。此外，喷射位置严重影响了NOX的去除效率和NH3泄漏。氨应在合适的温度范围内尽可能多地注入到前部区域。此外，SNCR喷射速度为最佳速度，为13.80 m / s，NOX去除率为51.50％，NH3泄漏为11.08 mg / Nm（3）。此外，在不同的SNCR喷射比下，对NOx去除效率和NH3泄漏也有很大影响。 SNCR-1（SNCR的第一行）的比例增加有利于NOX去除效率的提高。最佳喷射比是6：3：1（SNCR-1：SNCR-2（SNCR的第二行）：SNCR-3（SNCR的第三行））的比率，其中NOX去除效率为53.10％，NH3漏失为8.43 mg / Nm（3）。

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  • 来源
    《Fuel》 |2019年第1期|160-173|共14页
  • 作者

    Hu Zhifeng; Jiang Enchen; Ma Xiaoqian;

  • 作者单位

    South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Guangdong, Peoples R China;

    South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Guangdong, Peoples R China;

    South China Univ Technol, Sch Elect Power, Guangzhou 510640, Guangdong, 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

    Municipal solid waste; SNCR; Numerical simulation; NOX reduction; Combustion;

    机译：城市生活垃圾SNCR数值模拟减少NOX燃烧;

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