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Experimental study on nitric oxide reduction through calcium propionate reburning

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  • Niu, Shengli
  • Han, Kuihua
  • Zhao, Jianli
  • Lu, Chunmei

Abstract

Performances of calcium propionate (CP) on nitric oxide (NO) reduction are experimentally investigated on a drop tube furnace system from basic reburning (BR), Thermal De-NOx and advanced reburning (AR) and it is demonstrated to be feasible of using CP as reburning fuel. BR could supply about 80% efficiency with reburning fuel fraction (Rff) and residence time (τ) kept 20–25% and 0.7 s, respectively. Also, oxygen concentration is required to be less than 4%. However, initial NO concentration is not important to reduction. Characteristics of Thermal De-NOx are also studied. The maximum efficiency of 85.34% could be achieved at 1273 K with mole ratio of ammonia to nitric oxide (β) equaling to 1.75. The corresponding “temperature window” is 1215–1341 K. From 2% to 6% of oxygen concentration, the efficiency of Thermal De-NOx is constantly depressed by 16.17%. The performances of advanced reburning are greatly optimized and higher efficiency could be achieved using less calcium propionate and ammonia. At 1273 K, efficiency of 93.37% is supplied by AR with Rff = 19.83% and β = 0.8. Also, the corresponding “temperature window” is broadened to 1195–1355 K which is 1.27 times of the one in Thermal De-NOx at β = 1.75. Meanwhile, the impact of oxygen concentration on NO reduction is weakened in AR.

Suggested Citation

  • Niu, Shengli & Han, Kuihua & Zhao, Jianli & Lu, Chunmei, 2011. "Experimental study on nitric oxide reduction through calcium propionate reburning," Energy, Elsevier, vol. 36(2), pages 1003-1009.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:2:p:1003-1009
    DOI: 10.1016/j.energy.2010.12.008
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    References listed on IDEAS

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    1. Niu, Shengli & Han, Kuihua & Lu, Chunmei & Sun, Rongyue, 2010. "Thermogravimetric analysis of the relationship among calcium magnesium acetate, calcium acetate and magnesium acetate," Applied Energy, Elsevier, vol. 87(7), pages 2237-2242, July.
    2. Franco, Alessandro & Diaz, Ana R., 2009. "The future challenges for “clean coal technologies”: Joining efficiency increase and pollutant emission control," Energy, Elsevier, vol. 34(3), pages 348-354.
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