全文下载:
5.pdf
文章编号: 1672-6987(2025)02-0029-09 DOI: 10.16351/j.1672-6987.2025.02.005
马聪a, 楚长青b, 孟彦孝a, 贾文广a*(青岛科技大学 a. 机电工程学院; b. 气候变迁与能源可持续发展研究院, 山东 青岛266061)
摘要: 首先考察了硫代硫酸钠(ST)、三乙醇胺(TEA)、对苯二酚(HQ)和抗坏血酸钠(VC-Na)作为氧化抑制剂对Na2SO3脱硝性能的促进作用,实验结果表明,ST、TEA、HQ和VC-Na均可不同程度上抑制烟气中的O2对Na2SO3脱硝性能的不良影响,添加抑制剂后Na2SO3溶液的平均脱效率分别比未添加前提高了5%(ST),15%(TEA),20%(HQ)和32%(VC-Na)。对实验完成后的Na2SO3溶液的离子色谱分析表明,添加氧化抑制剂后的Na2SO3溶液中的含N离子总浓度(
和
)均明显高于未添加抑制剂的Na2SO3溶液,其中VC-Na具有最高的含N离子总浓度。基于VC-Na出色的氧化抑制效果,进一步研究了VC-Na的浓度、处理烟气的含氧量、脱硝剂温度
等关键工艺参数对VC-Na抑制效果的影响,结果表明:提高VC-Na浓度能明显提高吸收体系的吸收能力和吸收容量,而含氧量浓度的增加则会增大O2与液相中
接触的频率,进而加剧Na2SO3的氧化,不利于脱硝过程,碱性条件有利于VC-Na与SO32-离子氧化过程中产生的自由基相结合,阻断Na2SO3的氧化路径,进而促进VC-Na的氧化抑制效果。对比
和
离子在Na2SO3溶液与Na2SO3/VC-Na溶液中的累积情况,添加VC-Na可以切实有效的增强吸收和抑制SO32-的氧化。
关键词: 湿法脱硝; 亚硫酸盐氧化; 抗氧化剂筛选; Na2SO3; 抗坏血酸钠
中图分类号: TQ 09 文献标志码: A
引用格式: 马聪, 楚长青, 孟彦孝, 等. Na2SO3/VC-Na体系的低温烟气脱硝性能[J]. 青岛科技大学学报(自然科学版), 2025, 46(2): 29-37.
MA Cong, CHU Changqing, MENG Yanxiao, et al. Study on the performance of low temperature flue gas denitrification with Na2SO3/VC-Na[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2025, 46(2): 29-37.
Study on the Performance of Low Temperature Flue Gas Denitrification with Na2SO3/VC-Na
MA Conga, CHU Changqingb, MENG Yanxiaoa, JIA Wenguanga(a. College of Electromechanical Engineering; b. Institute of Climate Change and Energy Sustainable Development, Qingdao University of Science and Technology, Qingdao 266061, China)
Abstract: The experimental results showed that ST , TEA, HQ and VC-Na could inhibit the adverse effect of
in flue gas on denitrification performance to different degrees, and the average denitrification efficiency of
solution after the addition of inhibitors increased by 5%(
),15%(
,20%(
)and 32%(VC-Na), respectively, compared with that before the addition.The ion chromatographic analysis of the
solutions after the experiments were completed showed that the total concentrations (
and
) of N-containing ions in the
solutions after the addition of the oxidation inhibitor were significantly higher than those in the
solutions without the addition of the inhibitor, in which VC-Na had the highest total concentration of N-containing ions.Based on the excellent oxidation inhibition effect of VC-Na, the effects of key process parameters such as VC-Na concentration, oxygen content of treated flue gas, denitrifying agent temperature and pH on the inhibition effect were further investigated.The results show that increasing the concentration of VC-Na can significantly improve the absorption capacity and absorption capacity of the absorption system, while increasing the concentration of
will increase the frequency of contact between the flue gas and
in the liquid phase, which will intensify the oxidation of
, which is not conducive to the denitrification process.Alkaline conditions favor the oxidation-inhibiting effect of VC-Na by combining with free radicals generated during the oxidation of
ions, blocking the oxidation pathway of
, and thus promoting the oxidation-inhibiting effect of VC-Na.Comparing the accumulation of
and
ions in
solution and
/VC-Na solution, the addition of VC-Na can effectively enhance the oxidation of absorption and inhibition.
Key words: wet denitrification; sulfite oxidation; antioxidant screening; Na2SO3; VC-Na
收稿日期: 2024-06-01
基金项目: 国家能源集团2030重大项目先导项目(GJNY2030XDXM-19-12.4).
作者简介: 马聪(1995—),男,硕士研究生. * 通信联系人.