高温浮射流流场特性及其伴生粉尘控制研究
发布时间：2018-10-05 18:56
【摘要】：在现代工业生产中，诸多加工工艺都可能产生高温浮射流，这部分高温浮射流中伴生有大量余热、有害烟气及粉尘颗粒，这些有害物质的逃逸直接影响室内空气质量，并对操作者的身心健康带来严重的危害，很多企业中即使室内存在排风罩的抽吸作用，，这部分有害烟气及粉尘颗粒依然没有得到有效的控制。 为改善工业生产环境并提高粉尘捕集效率，本在总结国内外浮力羽流研究现状的基础上，结合现场实测数据、数值模计算以及理论分析确定合理、准确的边界条件及物理模型，在密度、比热等与温度相关物性线性差分进行合理设置，保证数值模拟计算结果的准确性。 分别对非受限工况下水平圆面出口、倾斜圆面出口及受限工况下倾斜圆面出口三种工况，在不同初始速度、初始温度及初始速度方向的影响因素下针对浮射流流场特性进行分析研究，并得出高温浮射流在各种影响因素下的流场特性，同时为排风罩的安置位置提供参考依据。 利用DPM离散轨道模型对非受限工况下倾斜圆面出口及受限工况下倾斜圆面出口高温浮射流中粉尘粒子进行两相流数值模拟计算，采用离散相与连续相单项耦合的方法，在排风罩高度及排风量大小不变的条件下得到不同排风罩尺寸及位置下的粉尘捕集效率，最后通过比较不同排风罩尺寸及位置下的粉尘捕集效率得到最佳的通风方案。经过分析研究后所总结出的结论为高温浮射流伴生粉尘通风设计提供相关的设计参考依据。
[Abstract]:In modern industrial production, many processing processes may produce high temperature floating jet, which is accompanied by a large amount of residual heat, harmful smoke and dust particles. The escape of these harmful substances has a direct impact on indoor air quality. And it brings serious harm to the operator's physical and mental health. Even if there is the suction effect of exhaust hood in many enterprises, this part of harmful smoke and dust particles are still not effectively controlled. In order to improve the industrial production environment and improve the dust capture efficiency, based on the summarization of the present situation of buoyancy plume research at home and abroad, the reasonable and accurate boundary conditions and physical models are determined by combining the field measured data, numerical model calculation and theoretical analysis. In order to ensure the accuracy of the numerical simulation results, the linear difference between density, specific heat and temperature related physical properties is reasonably set up. At different initial velocities, the horizontal circular outlet, the inclined circular outlet and the inclined circular outlet under the condition of non-restricted working conditions are obtained, respectively. Under the influence factors of initial temperature and initial velocity direction, the characteristics of floating jet flow field are analyzed and studied, and the flow field characteristics of high temperature floating jet under various influence factors are obtained, and the reference basis for the placement of exhaust hood is provided at the same time. The DPM discrete orbit model is used to simulate the two-phase flow of dust particles in the high-temperature floating jet at the exit of the inclined circular surface under the unconfined working condition and the exit of the inclined circular plane under the restricted condition. The discrete phase and continuous phase single coupling method is used. The dust capture efficiency of different exhaust hood sizes and positions is obtained under the condition of constant exhaust hood height and exhaust air volume. Finally, the best ventilation scheme is obtained by comparing the dust capture efficiency under different exhaust hood sizes and positions. The conclusion can be used as reference for the design of dust ventilation associated with high temperature floating jet.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：X962;X701.2
本文编号：2254503
[Abstract]:In modern industrial production, many processing processes may produce high temperature floating jet, which is accompanied by a large amount of residual heat, harmful smoke and dust particles. The escape of these harmful substances has a direct impact on indoor air quality. And it brings serious harm to the operator's physical and mental health. Even if there is the suction effect of exhaust hood in many enterprises, this part of harmful smoke and dust particles are still not effectively controlled. In order to improve the industrial production environment and improve the dust capture efficiency, based on the summarization of the present situation of buoyancy plume research at home and abroad, the reasonable and accurate boundary conditions and physical models are determined by combining the field measured data, numerical model calculation and theoretical analysis. In order to ensure the accuracy of the numerical simulation results, the linear difference between density, specific heat and temperature related physical properties is reasonably set up. At different initial velocities, the horizontal circular outlet, the inclined circular outlet and the inclined circular outlet under the condition of non-restricted working conditions are obtained, respectively. Under the influence factors of initial temperature and initial velocity direction, the characteristics of floating jet flow field are analyzed and studied, and the flow field characteristics of high temperature floating jet under various influence factors are obtained, and the reference basis for the placement of exhaust hood is provided at the same time. The DPM discrete orbit model is used to simulate the two-phase flow of dust particles in the high-temperature floating jet at the exit of the inclined circular surface under the unconfined working condition and the exit of the inclined circular plane under the restricted condition. The discrete phase and continuous phase single coupling method is used. The dust capture efficiency of different exhaust hood sizes and positions is obtained under the condition of constant exhaust hood height and exhaust air volume. Finally, the best ventilation scheme is obtained by comparing the dust capture efficiency under different exhaust hood sizes and positions. The conclusion can be used as reference for the design of dust ventilation associated with high temperature floating jet.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：X962;X701.2
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本文编号：2254503
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