脱硫废水蒸发增强电除尘脱除PM<sub>2.5</sub>和SO<sub>3</sub>实验研究

胡斌; 王晓焙; 白璐; 梁财; 杨林军

脱硫废水蒸发增强电除尘脱除PM_2.5和SO₃实验研究

东南大学能源热转换及其过程测控教育部重点实验室, 江苏南京 210096

基金项目:

国家重点基础研究发展规划 973 program

国家重点基础研究发展规划 2013CB228505

详细信息

通讯作者:
杨林军, E-mail:ylj@seu.edu.cn

中图分类号: X51
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- 被引次数: 0
出版历程
- 收稿日期: 2017-03-06
- 修回日期: 2017-04-21
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-07-10

Experimental study on strengthening the electrostatic precipitation removal of PM_2.5 and SO₃ by desulfurization wastewater evaporation

Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast University, Nanjing 210096, China

Funds:

the Major State Basic Research Development Program of China 973 program

the Major State Basic Research Development Program of China 2013CB228505

摘要

摘要: 搭建燃煤热态实验系统，研究脱硫废水蒸发对电除尘和脱硫系统的影响；考察脱硫废水蒸发前后细颗粒粒径的变化、电除尘出口PM_2.5和SO₃浓度变化；分析增强电除尘脱除PM_2.5和SO₃机理。结果表明，脱硫废水蒸发后，蒸发室出口细颗粒粒径峰值由0.1 μm增大到1.1 μm，观察脱硫废水蒸发前后扫描电镜，明显观察到废水蒸发后颗粒团聚长大，颗粒间存在絮状物；采用脱硫废水烟道蒸发后，电除尘细颗粒脱除效率提高5%左右，PM_2.5数量浓度脱除效率提高25%左右；SO₃脱除效率为60%-80%，烟气中SO₃浓度对增强电除尘脱除PM_2.5和SO₃均有影响；脱硫废水蒸发对脱硫系统的效率和脱硫浆液的pH值没有影响。
- 脱硫废水蒸发 /
- PM_2.5 /
- SO₃ /
- 电除尘 /
- 协同脱除
Abstract: In order to study the influence of desulfurization wastewater evaporation (DWE) on the ESP and the desulfurization performance, an experimental setup with DWE and the coal-fired thermal system was established. The removal of PM_2.5 and SO₃ from coal combustion with DWE and the evolution of fine particle size and PM_2.5 and SO₃ concentration at ESP outlet were investigated. Also, the mechanism of PM_2.5 and SO₃ removal was analyzed. The results show that DWE can increase the average size of particles from 0.1 μm to 1.1 μm. Compared SEM image before DWE with that after DWE, the particles reuniting and floc formation between particles are clearly observed. The ESP efficiency is increased by 5%; the removal efficiency of PM_2.5 in number concentration is increased by 25% at the ESP outlet; and the removal efficiency of SO₃ by ESP is 60%-80%. The SO₃ concentration in flue gas has an effect on PM_2.5 and SO₃ removal by ESP. However, the DWE has no effect on the desulfurization efficiency and the pH value of the desulfurization slurry.
- desulfurization wastewater evaporation /
- PM_2.5 /
- SO₃ /
- electrostatic precipitation /
- simultaneous control

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图 1 燃煤热态实验装置示意图

Figure 1 Coal-fired thermal state experiment system

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图 2 细颗粒物的粒径分布

Figure 2 Change of diameter distribution of particles

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图 3 细颗粒物的SEM照片

Figure 3 SEM of fine particles

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图 4 电除尘出口细颗粒累积分布

Figure 4 Fine particle cumulative distribution at ESP outlet

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图 5 电除尘出口细颗粒质量和数量浓度

Figure 5 Fine particle mass and number concentration at ESP outlet

: number concentration; : mass concentration

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图 6 电除尘总尘和PM_2.5脱除效率

Figure 6 ESP total dust and PM_2.5 removal efficiency

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图 7 不同温度下飞灰的比电阻

Figure 7 Fly ash resistance under different temperatures

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图 8 不同脱硫废水蒸发量下PM_2.5和SO₃的脱除效率

Figure 8 Removal efficiency of PM_2.5 and SO₃ under different flows

○: PM_2.5 removal efficiency; ■: SO₃ removal efficiency at initial 180 ℃; □: SO₃ removal efficiency at initial 150 ℃

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图 9 不同SO₃浓度下PM_2.5和SO₃的脱除效率

Figure 9 Removal efficiency of PM_2.5 and SO₃ under different SO₃ concentrations

: removal efficiency of SO₃; : removal efficiency of PM_2.5

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图 10 SO₃在飞灰上凝结机理示意图

Figure 10 SO₃ coagulation mechanism in fly ash

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图 11 脱硫系统SO₂脱除效率和浆液pH值

Figure 11 Desulfurization efficiency and slurry pH value

: desulfurization efficiency; : pH value; : system start time

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表 1 脱硫废水水质分析

Table 1 Analysis of desulfurization wastewater

表 2 不同液滴粒径烟道蒸发时间

Table 2 Evaporation time for different droplet diameters

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