论文总字数：18858字
摘 要
关键词：超低排放；烟尘颗粒；测量方法；浊度与浓度
Experimental study on physical properties of soot particles in coal-fired power plants
Sunbin
Supervised by lu yong
Abstract：The concentration of pollutants has dropped significantly after coal-fired power plants have carried out the ultra-low emissions standard. Meanwhile, higher requirements are made to the measurement technology. In order to have a better understand of the physical properties of the dust grain in ultra-low emission conditions, a series of studies were carried out, including some basic parameters, such as the appearance characteristics, grain size distribution and actual density. The results show that the shape of dust grain is round in basic and the small particles is easily to get agglomerated. The diameter of the dust grain is mainly between 10 and 50 μm while the actual density is 1670kg/m³. On the other hand, in the modeling analysis of the forced state of dust grain in anhydrous alcohol, the dust grain with larger diameter is more easily to get sedimentation velocity when its initial velocity is fixed, which is consistent the actual experimental results. What’s more, experiment on the turbidity of the suspensions was also carried out. The result shows that, the turbidity is stable in the first 60s, which can represent the concentration of the dust grain. The current conclusion is suitable for a particular kind of dust grain. To promote this conclusion to more kinds of dust grain, more experiments are needed.
Key words: Ultra-low Emission; Dust grain; Measurement Method; Turbidity and concentration
图清单
图2-1 | 振动管简图 |
图2-2 | 烟尘颗粒的光学显微镜观察图像 |
图2-3 | 烟尘颗粒的电镜扫描图像 |
图2-4 | 烟尘颗粒的粒度分布 |
图2-5 | 烟尘颗粒的真实密度测量曲线 |
图3-1 | 悬浮液中烟尘颗粒的受力分析 |
图3-2~3-5 | 不同粒径烟尘颗粒受力状态 |
图4-1 | 燃煤电厂除尘流程图 |
图4-2 | 浊度与时间的相关关系 |
图4-3 | 浓度为0.02kg/m³的悬浮液浊度随时间变化曲线 |
图4-4 | 浓度为0.09kg/m³的悬浮液浊度随时间变化曲线 |
图4-5 | 不同浓度悬浮液法浊度对比 |
图4-6 | 高斯函数拟合参数表 |
图4-7 | 高斯函数拟合曲线 |
图4-8 | 一次除尘后烟尘颗粒悬浮液浊度随时间变化曲线 |
图4-9 | 二次除尘后烟尘颗粒悬浮液浊度随时间变化曲线 |
变量注释表
变量符号 | 意义 | 变量符号 | 意义 |
D | 当量直径 | g | 重力加速度 |
d32 | 索太尔直径 | FD0 | 流体阻力 |
D50 | 中位直径 | Ap | 投影面积 |
T | 悬浮液浊度 | ρs | 颗粒的真实密度 |
C | 颗粒物浓度 | CD | 阻力系数 |
DV50 | 体积中位径 | Re | 雷诺数 |
dp | 颗粒直径 | I | 散射光强度 |
ρp | 颗粒物密度 | I0 | 入射光强度 |
ρ | 无水乙醇密度 | n | 单位体积内悬浮颗粒数 |
目 录
封面Ⅰ
独创性声明Ⅱ
使用授权声明Ⅱ
摘要Ⅲ
AbstractⅣ
变量注释表Ⅴ
图清单Ⅴ
目录Ⅵ
1绪论1
1.1研究背景1
1.2发展现状2
1.3研究内容与思路4
2烟尘颗粒的物理性质5
2.1实验装置5
2.1.1麦克奇S3500系列激光粒度分析仪简介5
2.1.2自动密度仪简介5
2.2烟尘颗粒的形貌特征6
2.3烟尘颗粒的粒度分布7
2.3.1颗粒粒度简介7
2.3.2烟尘颗粒的粒度分布7
2.4烟尘颗粒的真密度8
2.4.1颗粒的密度概念简介8
2.4.2实验器材8
2.4.3实验原理9
2.4.4实验步骤9
2.4.5实验结果及分析10
2.5本章小结11
3烟尘颗粒混合液的悬浮状态研究12
3.1理论基础12
3.2 MATLAB简介12
3.3颗粒在悬浮液中的悬浮状态计算13
3.4本章小结15
4烟尘颗粒混合液的浊度实验研究16
4.1理论基础 16
4.1.1 浊度的概念简介16
4.1.2 除尘技术的简介16
4.2实验装置17
4.3实验步骤17
4.4实验结果及分析18
4.4.1 浊度与时间的关系18
4.4.2 浊度与震荡程度的关系19
4.4.3 浊度与浓度的关系20
4.4.4 浊度与烟尘粒度分布的关系22
4.5本章小结22
5总结与展望23
参考文献24
致谢25
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