Additive for limestone-gypsum wet flue gas desulfurization and denitration process

一种石灰石-石膏湿法烟气脱硫脱硝添加剂

Abstract

The invention provides an additive for limestone-gypsum wet flue gas desulfurization and denitration process, which belongs to the flue gas treatment field. The additive comprises amines 40-60 wt.%, organic acids 30-45 wt.%, and polymeric organic carboxylate 10-30 wt.%. The amines can directly react with sulfur dioxide acidic gas to form ammonium sulfite, thus realizing desulfurization. The amines can react with nitrogen oxides to form nitrogen gas, thus realizing denitration. The organic acids and polymeric organic carboxylate can promote the dissolution of limestone for reducing the usage amount of limestone, promote pH buffering capability of limestone slurry, prevent rapid pH decrease during the absorption of sulfur dioxide, inhibit formation of calcium sulfite soft scale, and prevent plugging of demister. Compared with the existing limestone method, this invention has increased desulfurization efficiency (by 5-10%) and increased denitration efficiency (by above 50%) under the same liquid-gas ratio condition.
本发明公布了一种石灰石-石膏湿法烟气脱硫脱硝添加剂,属于烟气净化治理技术。本发明添加剂主要为三类物质复配而成,重量百分比为:胺类物质40~60,有机酸类物质30~45,高分子有机羧酸盐类物质10~30。该复合添加剂中胺类物质可直接与酸性气体二氧化硫直接反应生成亚硫酸铵,实现脱硫;胺类物质可与NOx反应生成N2,实现脱硝。有机酸及有机羧酸盐类物质可促进石灰石的溶解、减少石灰石的用量;提高石灰石浆液的pH值缓冲能力,减缓脱硫浆液在不断吸收二氧化硫过程中pH值快速下降;抑制亚硫酸钙软垢的生成,防止除雾器堵塞。与传统石灰石法相比,在相同液气比条件下提高脱硫效率5-10%,脱硝效率达到50%以上。

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Cited By (6)

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    CN-103143252-BJune 10, 2015广东电网公司电力科学研究院Additive capable of simultaneous desulphurization and demercuration and preparation method thereof
    CN-103272472-ASeptember 04, 2013上海电力学院一种湿法脱硫系统的烟气脱硫增效剂及其制备方法和应用
    CN-103272472-BJune 17, 2015上海电力学院一种湿法脱硫系统的烟气脱硫增效剂及其制备方法和应用
    CN-104998537-AOctober 28, 2015珲春承奕环保节能产品有限公司Efficient and environmentally-friendly desulfuration additive
    WO-2016150302-A1September 29, 2016江西永丰县博源实业有限公司一种脱硫脱硝剂