内插扭带对鼓泡反应器脱硫脱硝效果的影响

doi:10.16085/j.issn.1000-6613.2018-1658

摘要/Abstract

摘要：

在玻璃鼓泡反应器中进行Na₂S₂O₈和H₂O₂两种混合氧化剂吸收SO₂和NO的实验研究，结果表明：在Na₂S₂O₈氧化剂中加入H₂O₂可以促进脱硫脱硝，考虑溶液的成本以及系统的整体脱硫脱硝总效率，选取质量分数为2%的H₂O₂和10%的Na₂S₂O₈混合液具有较高的性价比。基于数值模拟的方法，将扭带引入鼓泡反应器中，研究扭带直径、厚度和扭率对鼓泡反应器脱硫脱硝效率的影响。数值模拟结果表明，与普通鼓泡反应器相比，加入扭带促进脱硫脱硝的效果。脱硫脱硝效率随着扭带直径和扭带厚度的增大而增大，随着扭带扭率的增大而减小，当扭带的直径从16mm增加到24mm时，系统的脱硫率和脱硝率分别增加了3.88%和3.45%；当扭带的厚度从0.2mm增加到1mm时，系统的脱硫率和脱硝率分别增加了4.27%和1.62%；当扭带的扭率从0.25增加到0.75时，系统的脱硫率和脱硝率分别降低了3.91%和1.90%。

关键词: 鼓泡反应器, 实验验证, 数值模拟, 脱硫, 脱硝, 扭带

Abstract:

Based on bubble column reactor, experimental study on the absorption of nitric oxide (NO) and sulfur dioxide (SO₂) by two mixed liquid oxidants [hydrogen peroxide (H₂O₂) and sodium persulfate (Na₂S₂O₈)] was performed. The experimental results showed that the addition of H₂O₂ can improve the desulfurization and denitrification performance of Na₂S₂O₈ solution. Considering the cost of the solution and the total efficiency, Mixed solution of 2% H₂O₂ and 10% Na₂S₂O₈ was selected as the working medium for the subsequent experiment and simulation. Based on numerical simulation method, the twist tape was introduced to the bubble column reactor. The effect of diameter, thickness and twist rate of twist tape on desulfurization and denitrification efficiency in the bubble column reactor was investigated. The numerical results showed that compared with general bubble column reactor, the twist tape could promote desulfurization and denitrification. The efficiency of desulfurization and denitrification increases with the increase of the twist tape diameter and the twist tape thickness, decreases with the increase of the twist rate of twist tape. When the twist diameter increased from 16mm to 24mm, the desulfurization and denitrification efficiency were increased by 3.88% and 3.45% respectively. When the twist tape thickness increased from 0.2mm to 1mm, the desulfurization and denitrification efficiencywere increased by 4.27% and 1.62% respectively. When the twist tape torsion increased from 0.25 to 0.75, the desulfurization and denitrification efficiency were decreased by 3.91% and 1.90% respectively.

Key words: bubble column reactor, experimental validation, numerical simulation, desulfurization, denitrification, twist tape

中图分类号:

X736.3

许源, 陶汉中, 张栋玮. 内插扭带对鼓泡反应器脱硫脱硝效果的影响[J]. 化工进展, 2019, 38(06): 2992-3001.

Yuan XU, Hanzhong TAO, Dongwei ZHANG. Desulfurization and denitrification in a bubbling reactor with twist tape[J]. Chemical Industry and Engineering Progress, 2019, 38(06): 2992-3001.

图/表 15

图1 液相氧化法鼓泡实验流程图

图2 液相氧化法鼓泡实验布置图

图3 混合液浓度对脱硫脱硝率的影响

图4 鼓泡反应瓶结构示意图

表1 鼓泡反应瓶结构尺寸

鼓泡反应瓶直径D/mm	进口直径d/mm
160	8

图5 鼓泡反应瓶的网格分布

图6 网格独立性分析

表2 脱硫脱硝率随网格数量的计算结果

序号	网格数量	脱硫效率 /%	脱硫误差 /%	脱硝效率 /%	脱硝误差 /%
1	74.87×10³	78.08	—	17.92	—
2	115.49×10³	75.68	3.17	18.89	5.13
3	149.38×10³	73.11	3.52	19.46	2.93
4	155.07×10³	72.73	0.52	19.56	0.51
5	189.39×10³	71.56	1.63	20.33	3.79
6	240.25×10³	70.41	1.63	21.23	4.24
7	265.70×10³	69.94	0.67	21.47	1.12
8	308.43×10³	69.68	0.37	21.81	1.56
9	331.04×10³	69.54	0.20	21.99	0.82
10	361.10×10³	69.48	0.09	22.08	0.41

图7 系统脱硫率的数值模拟结果与实验结果对比

图8 系统脱硝率的数值模拟结果与实验结果对比

图 9 内插扭带鼓泡反应器结构示意图

表3 内插扭带鼓泡反应器的基本结构尺寸

参数名称	数值/mm
反应器直径D ₁	80
反应器进口直径d ₁	10
扭带直径d ₂	16～24
反应器高度H ₁	80
扭带高度l ₂	12～60
扭带厚度t ₂	0.2～1

图10 脱硫脱硝率随扭带直径变化关系图

图11 脱硫率以及脱硝率随扭带厚度变化关系图

图12 脱硫率以及脱硝率随扭带扭率变化关系图

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