Simultaneous removal of SO2 and NOx by combination of ozone oxidation and Na2S2O3 solution spray

doi:10.11949/j.issn.0438-1157.20151536

Abstract

Abstract:

Ozone oxidation and Na₂S₂O₃ solution spray was combined to remove SO₂ and NO_x simultaneously. This coupling was studied experimentally. The results show that: SO₂ and NO_x can be eliminated simultaneously; at O₃/NO mole ratio 1.1—1.2, the NO_x removal efficiency increases with increasing concentration of Na₂S₂O₃; existence of SO₂ can facilitate removal of NO_x; the NO_x removal efficiency reaches 70% with low emission of SO₂ at Na₂S₂O₃concentration 2.0% and at SO₂ gas concentration 1030 mg·m^-3. Furthermore, the NO_x removal efficiency is enhanced with the pH of solution from 2.5 to 9, and reaches 75% at pH 9. The result of 3 hours running experiment indicates that NO_x and SO₂ can be removed efficiently and simultaneously and the stable and continuous operation is possible, because sodium thiosulfate can facilitate removal of NO_x and the NO_x is dominantly converted into NO₂^-. This process could be an efficient approach for eliminating SO₂ and NO_xsimultaneously and could have potential industrial application.

Key words: ozone oxidation, pollution, flue gas, simultaneous removal of SO₂ and NO_x, sodium thiosulfate, absorption

摘要：

采用臭氧氧化结合湿法喷淋硫代硫酸钠溶液的方法开展模拟烟气同时脱硫脱硝实验研究。结果表明,采用臭氧氧化结合Na₂S₂O₃-NaOH溶液湿法喷淋可以实现NO_x和SO₂协同脱除:在O₃/NO摩尔比为1.1～1.2时,溶液中Na₂S₂O₃浓度的增加会提高系统的NO_x脱除效率,烟气中SO₂的存在会促进NO_x的脱除,当SO₂浓度为1030 mg·m^-3、2.0%Na₂S₂O₃溶液作为喷淋液时可实现较高的SO₂脱除效率,同时NO_x脱除效率可达70%以上;喷淋液pH在2.5～9范围内变化时提高浆液pH有利于NO_x的脱除,当pH 9时脱硝效率可达75%。180 min连续同时脱硫脱硝实验结果表明,硫代硫酸钠可有效促进NO_x的脱除,并实现SO₂较高的脱除效率,同时可实现系统同时脱硫脱硝连续稳定运行,喷淋吸收后烟气中NO_x的主要转化产物为NO₂^-, 该方法作为一种有效的同时脱硫脱硝技术,具有一定的工业应用推广前景。

关键词: 臭氧氧化, 污染, 烟道气, 同时脱硫脱硝, 硫代硫酸钠, 吸收

CLC Number:

X511

YANG Ye, XU Chaoqun, ZHU Yanqun, LIN Fawei, MA Qiang, WANG Zhihua, CEN Kefa. Simultaneous removal of SO₂ and NO_x by combination of ozone oxidation and Na₂S₂O₃solution spray[J]. CIESC Journal, 2016, 67(5): 2041-2047.

杨业, 徐超群, 朱燕群, 林法伟, 马强, 王智化, 岑可法. 臭氧氧化结合硫代硫酸钠溶液喷淋同时脱硫脱硝[J]. 化工学报, 2016, 67(5): 2041-2047.

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Simultaneous removal of SO₂ and NO_x by combination of ozone oxidation and Na₂S₂O₃solution spray

臭氧氧化结合硫代硫酸钠溶液喷淋同时脱硫脱硝

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