CCD圆盘光透过离心沉降法测量颗粒粒度的研究
文献类型：学位论文
| 作者 | 金波 |
| 学位类别 | 硕士 |
| 答辩日期 | 2000-06 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 马兴华 |
| 关键词 | 圆盘光透过离心沉降法 颗粒 颗度 测量 递推算法 |
| 其他题名 | Studies on CCD-DCP for Particle Size Measurement |
| 学位专业 | 化学工艺 |
| 中文摘要 | 本文针对圆盘光透过离心沉降法（Disc Centrifuge Photosedimentation）测量超细颗粒粒度及其粒度分布还存在测量时间过长以及数据处理方法复杂等缺点，将线阵CCD(Charge Coupled Devices)技术应用到DCP测量中，并自行设计出新型CCD-DCP测量装置。本文对这种新型的测量装置的原理、数据处理方法以及特点进行了理论分析，并使用该测量装置对一些物料进行了实验研究。从颗粒在离心力场沉降中的受力分析入手，通过求解二阶常系数微分方程得到颗粒沉降速度的计算公式，并给出该公式近拟为目前化工专著中普遍使用的计算公式的条件；针对DCP粒度仪采用均匀采用均匀悬浮液方式进行操作时，从采样光强数据计算颗粒粒度分布的方法过于复杂，提出计算颗粒粒度分布的递推算法。该算法不仅考虑颗粒沉降的径向稀释放效应，而且考虑了颗粒消光系数的影响，实验结果表明该算法计算过程简单，结果准确。该算法也可以用于重力沉降。对该测量装置设计了单点及多点采样程度，并且实现沉降过程的可视化以及在不需要机械装置的条件下实现对整个测量区的扫描。该装置经二氧化钛标准颗粒标定后，对九种颗粒进行测定，证明其具有较好的适用性及省时性，使用该测量装置对颗粒在悬浮液中的分散进行了研究，提出用正交试验法确定颗粒在悬浮液中的最佳分散条件。定性地讨论了测试条件对测量结果的影响。实验发现三点采样得到的三条相对光强曲线的波动幅度不同，对此进行解释。 |
| 英文摘要 | Since the time for measuring the ultrafine particle size and its distribution by using the common Disc Centrifuge Photosedimentometry (DCP) apparatus is too long and the method for calculating particle size distribution is too complicated, the author applied the linear Charge Coupled Devices (DDC) to the DCP, and designed a new kind of laboratorial DCP apparatus(CCD-DCP). In these thesis the principle, method for calculation and character of this laboratorial apparatus were analyzed, and some experimental study was carried out by using this apparatus. To begin with analyzing the forces upon particles in the centrifugal field, the expression for calculating the setting velocity of particles was gained by solving the constant coefficient quadratic differential equation, and the conditions on which this expression can be approximately simplified to the expression in today chemical engineering monograph were given. A series of recurrence formulae to calculate particle size distribution from the light intensity data were advanced to replace the complicated method which are used in the common DCP apparatus operating in the homogeneous suspension mode. Not only effect of the radial dilution during particle sedimentation, but also the effect of the extinction efficiency of particles are considered. The experimental results show that the calculation process is simple and the result is accurate. This method can be also be used in gravitational field. In this laboratorial apparatus one point and many point sampling programs are compiled, view-sedimentation is realized and the whole sedimentation region scan is implemented without mechanical device. Nine kinds of particle simples are measured by this laboratorial apparatus which was calibrated by using TiO_2 standard particle. Study on particle dispersing in liquid is processed by using this laboratorial apparatus, and orthogonal experiment method is advanced to determinate to optimal condition of disperse. The effect of measuring condition on the measuring results is discussed qualitatively. The phenomenon about the difference of fluctuant amplitude on three light density curves achieved by three points sampling is discovered and explained. |
| 语种 | 中文 |
| 公开日期 | 2013-09-26 |
| 页码 | 78 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1940]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 金波. CCD圆盘光透过离心沉降法测量颗粒粒度的研究[D]. 中国科学院研究生院. 2000. |
入库方式： OAI收割
来源：过程工程研究所
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