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Absorption of Nitrogen Oxides into Sodium Hydroxide Solution in a Rotating Packed Bed with Preoxidation by Ozone
Energy & Fuels ( IF 5.3 ) Pub Date : 2017-09-26 00:00:00 , DOI: 10.1021/acs.energyfuels.7b01417
Baochang Sun 1, 2 , Miaopeng Sheng 2 , Wenlei Gao 1 , Liangliang Zhang 1, 2 , Moses Arowo 2 , Yan Liang 3 , Lei Shao 1, 2 , Guang-Wen Chu 1, 2 , Haikui Zou 1, 2 , Jian-Feng Chen 1, 2
Affiliation  

This study employed a rotating packed bed (RPB) to enhance the absorption performance of nitrogen oxides (NOx) into sodium hydroxide (NaOH) solution with the preoxidation of NO by ozone. The absorption performance of NOx was evaluated in terms of its removal efficiency (η) from a gas stream under various operating conditions including O3/NOx molar ratio (MR), rotation speed of the RPB (N), liquid flow rate (L), NaOH concentration (CNaOH), inlet NOx concentration (CNOx), and using time (t). Also, the corresponding effect of adding oxidants (NaClO, H2O2, and KMnO4) and a reductant (CO(NH2)2) into the NaOH solution on NOx removal efficiency was investigated. Results indicated that preoxidation of NO by O3 significantly improved NOx removal efficiency and the removal efficiency increased with increasing O3/NOx molar ratio, NaOH concentration, and liquid flow rate but decreased with increase in inlet NOx concentration and using time. Additionally, NOx removal efficiency first increased and then decreased with increasing rotation speed of the RPB. Both the oxidation and reduction additives enhanced NOx removal efficiency, and the order of enhancement was found to be KMnO4 > H2O2 > CO(NH2)2 > NaClO. These results further indicate that the hydrolysis reactions of NOx are the rate-determining steps in the NOx absorption process and, thus, the main factors hindering NOx removal during the wet scrubbing process. This work demonstrates that RPB has great potential for removal of NOx by a wet scrubbing process in view of the small size of the RPB, low temperature, and the short gas retention time of 0.27 s applied in this work.

中文翻译:

臭氧预氧化旋转填充床中氢氧化钠溶液中氮氧化物的吸收

这项研究采用旋转填充床(RPB)来增强氮氧化物被臭氧预氧化,从而将氮氧化物(NO x)吸收到氢氧化钠(NaOH)溶液中的性能。NO的吸收性能X中的从各种操作条件下的气体流包括o它的去除效率(η)进行评价3 / NO X的摩尔比(MR),所述RPB(转速Ñ),液体流动速率(L),NaOH浓度(C NaOH),入口NO x浓度(C NO x)和使用时间(t)。此外,加入氧化剂的相应效果(次氯酸钠,H 2 ö 2,和高锰酸钾4)和还原剂(CO(NH 22)插入NO NaOH溶液X除去效率进行了研究。结果表明,O 3对NO的预氧化作用显着提高了NO x的去除效率,且去除效率随O 3 / NO x摩尔比,NaOH浓度和液体流速的增加而增加,但随入口NO x浓度和使用时间的增加而降低。另外,NO x去除效率随RPB转速的增加先增加后降低。既增强NO的氧化和还原添加剂X除去效率,和提高的顺序被发现是高锰酸钾42 ö 2 > CO(NH 22 >的NaClO。这些结果进一步表明,NO的水解反应X是在NO速率决定步骤X吸收过程,因此,阻碍了NO的主要因素X中湿式涤气过程的去除。这项工作表明RPB具有去除NO x的巨大潜力 考虑到RPB的体积小,温度低以及在这项工作中应用了0.27 s的短气体保留时间,因此采用湿法洗涤工艺。
更新日期:2017-09-26
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