氨法烟气脱硫SO2吸收传质系数研究

doi:10.11949/j.issn.0438-1157.20181328

化工学报 ›› 2019, Vol. 70 ›› Issue (4): 1367-1374.DOI: 10.11949/j.issn.0438-1157.20181328

氨法烟气脱硫SO₂吸收传质系数研究

贾勇^1,²(),蒋进¹,赵忍¹,荣卫龙³,殷李国¹,顾明言¹,龙红明²

1. 安徽工业大学能源与环境学院，安徽马鞍山 243002
2. 冶金减排与资源综合利用教育部重点实验室，安徽工业大学，安徽马鞍山 243002
3. 山东爱亿普环保科技有限公司，山东淄博 256400

收稿日期:2018-11-15 修回日期:2019-01-09 出版日期:2019-04-05 发布日期:2019-04-05
通讯作者: 贾勇
作者简介:贾勇（1981—），男，博士，副教授，<email>jiayong2000@163.com</email>
基金资助:
国家重点研发计划项目(2017YFB0601805);国家自然科学基金项目(51308002)

Investigation of mass transfer coefficient of absorption of sulfur dioxide by ammonia

Yong JIA^1,²(),Jin JIANG¹,Ren ZHAO¹,Weilong RONG³,Liguo YIN¹,Mingyan GU¹,Hongming LONG²

1. School of Energy and Environment, Anhui University of Technology, Ma’anshan 243002, Anhui, China
2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Ma’anshan 243002, Anhui, China
3. Air Environmental Protection Science & Technology Co. Ltd., Zibo 256400, Shandong, China

Received:2018-11-15 Revised:2019-01-09 Online:2019-04-05 Published:2019-04-05
Contact: Yong JIA

摘要/Abstract

摘要：

喷淋塔氨法脱硫技术被广泛应用于净化烟气的SO₂，传质系数是喷淋吸收塔重要的设计和运行参数，但目前文献中有关氨法脱硫传质系数的报道很少，还有待进一步研究。在喷淋塔中对氨法脱硫SO₂吸收传质过程进行了实验研究，结合对液滴和塔壁液膜运动的计算，得到不同实验条件下SO₂的吸收传质速率，并建立了氨法脱硫SO₂吸收传质系数表达式。该传质系数包含浆液pH、烟气流速u_g和液气比L/G等主要参数，能够反映不同pH、u_g和L/G条件下SO₂在单位气液接触面积上的传质速率。对比验证结果表明，该传质系数计算得到的SO₂吸收传质速率与实验值之间的相对误差小于±12%，二者能够较好地吻合。建立的传质系数表达式能够为喷淋塔氨法脱硫的优化设计和运行提供理论参考。

关键词: 氨法脱硫, 吸收, 传质, 模拟

Abstract:

The ammonia-based flue gas desulfurization (FGD) using spray scrubber is widely used for removing SO₂ from flue gas. However, the reports about mass transfer coefficient of SO₂ in the ammonia-based desulphurization process are little in the literature and a further investigation is needed, even though the mass transfer coefficient of SO₂ is much needed for optimizing the design and operation of the absorption tower of ammonia-based FGD system. On basis of experiments of absorbing SO₂ with ammonia in a lab-scale spray scrubber, the mass transfer rate per unit gas-liquid interfacial area was investigated by calculating the motion of droplets and liquid membrane. The correlation to predict the mass transfer coefficient of SO₂ absorption by ammonia was also proposed, including parameters pH, u_g and L/G. The yielding correlation could be used for quantitatively predicting the mass transfer rate per unit gas-liquid interfacial area under different operating conditions such as pH, gas flow rate and liquid-to-gas ratio. The comparison results show that the calculated SO₂ mass transfer rate agrees well with the measured data. The relative error between the calculated mass transfer rate and the measured data is within ±12%. The established mass transfer coefficient expression can provide a theoretical reference for the optimal design and operation of spray tower ammonia desulfurization.

Key words: ammonia-based FGD, absorption, mass transfer, simulation

中图分类号:

X 511

贾勇, 蒋进, 赵忍, 荣卫龙, 殷李国, 顾明言, 龙红明. 氨法烟气脱硫SO₂吸收传质系数研究[J]. 化工学报, 2019, 70(4): 1367-1374.

Yong JIA, Jin JIANG, Ren ZHAO, Weilong RONG, Liguo YIN, Mingyan GU, Hongming LONG. Investigation of mass transfer coefficient of absorption of sulfur dioxide by ammonia[J]. CIESC Journal, 2019, 70(4): 1367-1374.

图/表 11

图1 喷淋塔氨法脱硫实验系统

Fig.1 Diagram of experimental system of ammonia-based desulphurization

图2 SO2吸收物料衡算图

Fig.2 Schematic diagram of material balance for SO2 absorption

图3 +4价硫各组分的分布系数

Fig.3 Distribution coefficient of each species of total sulfite versus pH (T=298.15 K)

表1 SO2吸收实验传质速率

Table 1 Experimental mass transfer rate of SO2 absorption

u_g/ (m·s^-1)	pH	(L/G)/ (L·m^-3)	T/K	$C_{S O_{2}, o u t}$ ×10⁶	k_y/ (kmol·m^-2·h^-1)
2.16	5.5	2	298.15	253	2.04
2.16	5.5	2.5	298.15	250	2.41
2.16	5.5	3	298.15	196	2.74
2.16	5.5	3.5	298.15	214	2.85
2.16	5.5	4	298.15	184	3.20
2.16	5.15	3	298.15	202	3.21
2.16	5.39	3	298.15	198	3.34
2.16	5.44	3	298.15	196	3.38
2.16	5.58	3	298.15	188	3.62
2.16	5.68	3	298.15	184	3.75
2.16	5.7	3	298.15	179	3.89
2.16	5.73	3	298.15	174	4.05
2.16	5.83	3	298.15	165	4.35
2.16	5.95	3	298.15	162	4.45
1.77	5.5	3	298.15	184	3.11
2.16	5.5	3	298.15	196	3.28
2.56	5.5	3	298.15	220	3.39
2.95	5.5	3	298.15	226	3.43
3.34	5.5	3	298.15	233	3.54
2.56	5.5	2	298.15	262	2.14
2.56	5.5	2.5	298.15	227	2.58
2.56	5.5	3	298.15	208	2.93
2.56	5.5	3.5	298.15	199	3.12
2.56	5.5	4	298.15	188	3.37
2.56	5.15	2	298.15	181	3.54
2.56	5.39	2	298.15	177	3.65
2.56	5.44	2	298.15	173	3.75
2.56	5.58	2	298.15	164	4.01
2.56	5.68	2	298.15	159	4.15
2.56	5.7	2	298.15	153	4.33
2.56	5.73	2	298.15	148	4.50
2.56	5.83	2	298.15	137	4.84
2.56	5.95	2	298.15	134	4.95
1.77	5.5	2	298.15	215	2.80
2.16	5.5	2	298.15	208	2.93
2.56	5.5	2	298.15	201	3.07
2.95	5.5	2	298.15	197	3.15
3.34	5.5	2	298.15	193	3.26

表1 SO2吸收实验传质速率

Table 1 Experimental mass transfer rate of SO2 absorption

u_g/ (m·s^-1)	pH	(L/G)/ (L·m^-3)	T/K	$C_{S O_{2}, o u t}$ ×10⁶	k_y/ (kmol·m^-2·h^-1)
2.16	5.5	2	298.15	253	2.04
2.16	5.5	2.5	298.15	250	2.41
2.16	5.5	3	298.15	196	2.74
2.16	5.5	3.5	298.15	214	2.85
2.16	5.5	4	298.15	184	3.20
2.16	5.15	3	298.15	202	3.21
2.16	5.39	3	298.15	198	3.34
2.16	5.44	3	298.15	196	3.38
2.16	5.58	3	298.15	188	3.62
2.16	5.68	3	298.15	184	3.75
2.16	5.7	3	298.15	179	3.89
2.16	5.73	3	298.15	174	4.05
2.16	5.83	3	298.15	165	4.35
2.16	5.95	3	298.15	162	4.45
1.77	5.5	3	298.15	184	3.11
2.16	5.5	3	298.15	196	3.28
2.56	5.5	3	298.15	220	3.39
2.95	5.5	3	298.15	226	3.43
3.34	5.5	3	298.15	233	3.54
2.56	5.5	2	298.15	262	2.14
2.56	5.5	2.5	298.15	227	2.58
2.56	5.5	3	298.15	208	2.93
2.56	5.5	3.5	298.15	199	3.12
2.56	5.5	4	298.15	188	3.37
2.56	5.15	2	298.15	181	3.54
2.56	5.39	2	298.15	177	3.65
2.56	5.44	2	298.15	173	3.75
2.56	5.58	2	298.15	164	4.01
2.56	5.68	2	298.15	159	4.15
2.56	5.7	2	298.15	153	4.33
2.56	5.73	2	298.15	148	4.50
2.56	5.83	2	298.15	137	4.84
2.56	5.95	2	298.15	134	4.95
1.77	5.5	2	298.15	215	2.80
2.16	5.5	2	298.15	208	2.93
2.56	5.5	2	298.15	201	3.07
2.95	5.5	2	298.15	197	3.15
3.34	5.5	2	298.15	193	3.26

图4 ug对传质速率的影响

Fig.4 Effect of ug on mass transfer rate

图5 不同ug条件下传质速率计算值与实验值相对误差

Fig.5 Deviation of predicted mass transfer rate from experimental at different ug

图6 pH对传质速率的影响

Fig.6 Effect of pH on mass transfer performance

图7 不同pH条件下传质速率计算值与实验值相对误差

Fig.7 Deviation of predicted mass transfer rate from experimental at different pH

图8 L/G对传质速率的影响

Fig.8 Effect of L/G on mass transfer rate

图9 不同L/G条件下传质速率计算值与实验值相对误差

Fig.9 Deviation of predicted mass transfer rate from experimental at different L/G

图10 传质系数的验证

Fig.10 Verification of mass transfer coefficient

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氨法烟气脱硫SO₂吸收传质系数研究

Investigation of mass transfer coefficient of absorption of sulfur dioxide by ammonia

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