Removal Efficiency of the Combined Desulfurization/Denitration Process Using Powder-Particle Fluidized Bed

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A combined desulfurization/denitration (DeSO<SUB><I>x</I></SUB>/DeNO<SUB><I>x</I></SUB>) process has recently been proposed by using the powder-particle fluidized bed (PPFB). In the process, SO<SUB><I>x</I></SUB> is removed by a fine DeSO<SUB><I>x</I></SUB> sorbent continuously supplied and NO<SUB><I>x</I></SUB> is reduced to N<SUB>2</SUB> by ammonia under the catalysis of a coarse DeNO<SUB><I>x</I></SUB> catalyst, the fluidization medium particles. By using the simplest model gas, SO<SUB>2</SUB>-NO-Air, in a laboratory scale reactor, SO<SUB>2</SUB> and NO removals in the process are evaluated in this paper by testing the possible side reactions related to SO<SUB>2</SUB> and NO. Then, investigations are extended to the removal efficiency for the simulated flue gas SO<SUB>2</SUB>-NO-N<SUB>2</SUB>-H<SUB>2</SUB>O-Air and to the effects of operating conditions, both gas velocity and the static height of catalyst bed, upon the SO<SUB>2</SUB> and NO abatements. The DeSO<SUB><I>x</I></SUB> sorbents used were CuO·V<SUB>2</SUB>O<SUB>5</SUB>·K<SUB>2</SUB>SO<SUB>4</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> and NaHCO<SUB>3</SUB>, and the DeNO<SUB><I>x</I></SUB> catalysts were V<SUB>2</SUB>O<SUB>5</SUB>·WO<SUB>3</SUB>/TiO<SUB>2</SUB> and WO<SUB>3</SUB>/TiO<SUB>2</SUB>. It was found that this process suffers little from SO<SUB>3</SUB> exhaust at the reactor exit. SO<SUB>2</SUB> may be chemically adsorbed onto DeNO<SUB><I>x</I></SUB> catalyst, but it can be suppressed by using a highly efficient sorbent such as CuO·V<SUB>2</SUB>O<SUB>5</SUB>·K<SUB>2</SUB>SO<SUB>4</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>. Under NH<SUB>3</SUB>/NO = 1, both NO and NO<SUB>2</SUB> can be similarly reduced into N<SUB>2</SUB> and the possible side reactions between sorbent and NO<SUB><I>x</I></SUB> can also be completely abated by the NO<SUB><I>x</I></SUB> reduction. SO<SUB>2</SUB> and NO removals in the process are more or less affected by water vapor and oxygen fractions, but the removals greater than 90% for SO<SUB>2</SUB> and no less than 80% for NO can still be maintained for actual flue gas, even in a shallow bed with a static catalyst load height of 0.1 m.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 32(1), 82-90, 1999-02 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10002067157
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    4664964
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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