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氨法脫硫

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脫硫原理

  氨法煙氣脫硫工藝是用氨液洗滌含SO2的廢氣,形成(NH4)2SO3-NH4HSO3-H2O的吸收液體系,該溶液中的(NH4)2SO3對SO2具有很好的吸收能力,它是氨法中的主要吸收劑。

  氨法煙氣脫硫技術以煙氣中的SO2和氨液的反應為基礎,得到亞硫酸銨中間產品:

  SO2+H2O+XNH3=(NH4)xH2-xSO3

  亞硫酸銨再被壓縮空氣氧化成硫酸銨:

  (NH4)xH2-xSO3+1/2O2+(2-X)NH3=(NH4)2SO4

  同時利用煙氣的熱量濃縮結晶生產硫銨,投資低,能耗低。

工藝流程

  SO2吸收循環系統

  本系統有吸收塔及其附屬設備組成,是脫硫系統的核心。待處理煙氣與吸收塔內含氨循環漿液接觸反應脫除SO2,達到排放標準的煙氣經煙囪排放。

  氧化傘氣系統

  系統由氧化風機及相關管路組成,氧化風機向吸收塔底漿液送入氧化空氣,將脫硫過程牛成的業硫酸銨氧化成硫酸銨。

  吸收劑供應系統

  通常采川液氨或氨氣作為吸收劑,本系統功能為吸收系統定量提供氨液。

  硫銨后處理系統

  脫硫反應生成的硫銨漿液進入干燥造粒系統,經噴漿造粒生成2-4mm粒度的硫銨可直接銷售。

流程圖

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氨法脫硫
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