微流体冲击式过滤器模型及其对放射性气溶胶的收集分析
发布时间：2022-02-26 21:29
反应堆一旦发生小破口失水事故,大量的放射性气溶胶将会很快释放到安全壳内,这可能导致安全壳内的压力升高。为了在不污染大气和人类的同时降低压力,放射性粒子不能直接释放,所以,实现颗粒污染物排放前的过滤是十分必要的。因此,有必要使用适当的过滤装置,来避免放射性气溶胶扩散到大气中。过滤器是一种非常重要的颗粒收集装置,在不同的工业过程中都有应用,特别是核电站放射性气溶胶的收集。本研究建立了具有不同结构的微流体惯性过滤器的三维几何模型,探讨了过滤器内部的粒子运动和沉积。利用ICEM CFD的商业软件建立了过滤器模型,并对网格进行了精确划分。我们假设放射性气溶胶颗粒在入口喷嘴处均匀释放,并且所有假设和边界条件都设定为与核电厂条件一致。本文的第一次流动计算是在没有颗粒的情况下进行的,第二次流动模拟是在入口喷嘴中有颗粒的情况下进行的。通过数值模拟,研究了惯性过滤器对放射性气溶胶的收集效率和压力特性。此外,我们还对气溶胶颗粒的流体性质和参数进行了研究,发现关键因素（如气流速度、气溶胶颗粒直径和入口直径）的变化对收集效率有重要影响。该模型用于研究影响收集效率的因素。经研究发现,在管道长度不变的情况下,随着入...
【文章来源】：华北电力大学(北京)北京市211工程院校教育部直属院校
【文章页数】：48 页
【学位级别】：硕士
【文章目录】：
摘要
ABSTRACT
CHAPTER 1. INTRODUCTION
1.1 SIGNIFICANCE OF RADIOACTIVE AEROSOL COLLECTION
1.2 BACKGROUND
1.2.1 Particle Control Technology
1.2.2 Aerosol Filters for Nuclear Power Plant
1.3 LITERTURE REVIEW
1.3.1 Brief History & Review of Inertial Impaction
1.3.2 Research Status
1.4 STATEMENT OF OBJECTIVES
1.5 THESIS OUTLINE
CHAPTER 2. THEORY ANALYSIS OF RADIOACTIVE AEROSOL COLLECTION
2.1 PARTICLE COLLECTION BY FILTERS
2.2 INERTIAL IMPACTION THEORY
2.2.1 Conventional Inertial Impactor
2.2.2 Virtual Inertial Impactor
2.2.3 Centrifugal Impaction
2.3 MATHEMATICAL FORMULATION OF CONTINUOUS PHASE
2.4 MATHEMATICAL FORMULATION OF DISCRETE PHASE
2.5 PRESSURE DROP
2.5.1 Filter Loading Behavior
2.6 COLLECTION EFFICENCY
2.7 QUALITY FACTOR EQUATION
CHAPTER 3. DESCRIPTIONOF CFD SIMULATION
3.1 MODEL DESCRIPTION
3.2 FLUENT MESH
3.3 FLUENT SEUP
3.4 FLOW FIELD
3.5 PARTICLE DEPOSITION
CHAPTER 4. RESULTS & DISCUSSION
4.1 FLOW FIELD AND PARTICLE DEPOSITION
4.2 FACTORS AFFECTING COLLECTION EFFICIENCY
4.2.1 Effect of Inlet Diameter of Round Nozzle
4.2.2 Effect of Inlet Velocity
4.2.3 Effect of Pipe Length
4.2.4 Effect of Turning Angle
4.3 PRESSURE DROP PROFILE
4.4 FILTER LOADING BEHAVIOR
4.5 RELATIONSHIP BETWEEN √STK AND COLLECTION EFFICIENCY
CHAPTER 5. CONCLUSION &FUTURE WORK
5.1 CONCLUSION
5.2 FUTURE WORK
REFERNCES
ACKNOWLEDGEMENTS
本文编号：3645008
【文章来源】：华北电力大学(北京)北京市211工程院校教育部直属院校
【文章页数】：48 页
【学位级别】：硕士
【文章目录】：
摘要
ABSTRACT
CHAPTER 1. INTRODUCTION
1.1 SIGNIFICANCE OF RADIOACTIVE AEROSOL COLLECTION
1.2 BACKGROUND
1.2.1 Particle Control Technology
1.2.2 Aerosol Filters for Nuclear Power Plant
1.3 LITERTURE REVIEW
1.3.1 Brief History & Review of Inertial Impaction
1.3.2 Research Status
1.4 STATEMENT OF OBJECTIVES
1.5 THESIS OUTLINE
CHAPTER 2. THEORY ANALYSIS OF RADIOACTIVE AEROSOL COLLECTION
2.1 PARTICLE COLLECTION BY FILTERS
2.2 INERTIAL IMPACTION THEORY
2.2.1 Conventional Inertial Impactor
2.2.2 Virtual Inertial Impactor
2.2.3 Centrifugal Impaction
2.3 MATHEMATICAL FORMULATION OF CONTINUOUS PHASE
2.4 MATHEMATICAL FORMULATION OF DISCRETE PHASE
2.5 PRESSURE DROP
2.5.1 Filter Loading Behavior
2.6 COLLECTION EFFICENCY
2.7 QUALITY FACTOR EQUATION
CHAPTER 3. DESCRIPTIONOF CFD SIMULATION
3.1 MODEL DESCRIPTION
3.2 FLUENT MESH
3.3 FLUENT SEUP
3.4 FLOW FIELD
3.5 PARTICLE DEPOSITION
CHAPTER 4. RESULTS & DISCUSSION
4.1 FLOW FIELD AND PARTICLE DEPOSITION
4.2 FACTORS AFFECTING COLLECTION EFFICIENCY
4.2.1 Effect of Inlet Diameter of Round Nozzle
4.2.2 Effect of Inlet Velocity
4.2.3 Effect of Pipe Length
4.2.4 Effect of Turning Angle
4.3 PRESSURE DROP PROFILE
4.4 FILTER LOADING BEHAVIOR
4.5 RELATIONSHIP BETWEEN √STK AND COLLECTION EFFICIENCY
CHAPTER 5. CONCLUSION &FUTURE WORK
5.1 CONCLUSION
5.2 FUTURE WORK
REFERNCES
ACKNOWLEDGEMENTS
本文编号：3645008
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