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Influence of Biomass Reburning on NOx Reductions during Pulverized Coal Combustion

机译：生物质再燃对煤粉燃烧过程中NOx还原的影响

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摘要

The NOx reductions by reburning using sawdust, corn straw, and cotton straw were studied in a lab-scale and self heating drop-tube furnace with varied reaction temperatures, reburning fuel fractions, stoichiometric ratios, and residence times in the reburning zone. Results show that NOx reduction efficiency increased with reburning biomass ratio; however, the NOx reduction efficiency increased first and then decreased with the increased reburning temperature, stoichiometric ratio, and residence time with an optimal point around 1100 degrees C, 0.6-0.7, and 1.88 s, respectively. Above 1100 degrees C, thermal-NOx that originated from reburning biomass resulted in a decrease in NOx reduction efficiency. High stoichiometric ratio oxidized reducing radicals and thus decreased NOx reduction efficiency, but the NOx reductions were also inhibited when the excess air ratio was too low, which hindered the further conversion of the intermediates during NOx reductions. In a fixed-size furnace, long residence time in the reburning zone improved volatile release and NOx reductions, but shortened residence time of pulverized coal in the primary zone resulted in incomplete burnout and excess oxygen which oxidized the reducing radicals, and thus decreased NOx reduction efficiency. In addition, high volatiles and heating value (influencing furnace temperature distribution) of the reburning biomass caused high NOx reduction efficiency, and consequently, the woody biomass (sawdust) showed higher NOx reduction efficiency in comparisons with agricultural residues such as corn straw and cotton straw. Meanwhile, the Van Krevelen diagram where the fuel far from the zero point shows high NOx reduction efficiency may be used as a guideline for the selection of reburning biomass.
机译：在实验室规模和自热式滴管式炉中研究了使用木屑，玉米秸秆和棉秸秆进行再燃烧所产生的NOx还原，该反应炉具有不同的反应温度，再燃燃料分数，化学计量比和在再燃区的停留时间。结果表明，NOx的还原效率随生物质再燃比的增加而增加；然而，随着再燃温度，化学计量比和停留时间的增加，NOx的还原效率先上升，然后下降，最佳点分别在1100摄氏度，0.6-0.7和1.88 s左右。高于1100摄氏度时，源自生物质再燃的热NOx导致NOx还原效率降低。高化学计量比的氧化还原自由基被氧化，从而降低了NOx的还原效率，但是当过量空气比率太低时，NOx的还原也受到抑制，这阻碍了中间体在NOx还原过程中的进一步转化。在固定大小的炉子中，在再燃区中的较长停留时间改善了挥发物的释放和NOx的减少，但缩短了煤粉在主要区中的停留时间导致了不完全的燃尽和过量的氧气，这些氧气氧化了还原自由基，从而减少了NOx的还原效率。此外，再燃生物质的高挥发物和热值（影响炉温分布）导致较高的NOx还原效率，因此，与农业残留物（例如玉米秸秆和棉秸秆）相比，木质生物质（木屑）具有较高的NOx还原效率。 。同时，距离零点较远的燃料显示出高的NOx还原效率的Van Krevelen图可以用作选择再燃生物质的指南。

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  • 来源
    《Energy & fuels》 |2017年第5期|5597-5602|共6页
  • 作者

    Zhuang Huiyong; Niu Yanqing; Gong Yanhao; Zhang Yu; Zhang Yanru; Hui Shien;

  • 作者单位

    Tsinghua Univ, Inst Energy Environm & Econ, Beijing 100084, Peoples R China|Natl Bio Energy Co Ltd, Beijing 100052, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Natl Bio Energy Co Ltd, Beijing 100052, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Sch Energy & Power Engn, Xian 710049, Shaanxi, 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《生物学医学文摘》(MEDLINE);
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