铸造砂处理工部多点除尘系统设计

对某铸造车间砂处理工部除尘系统方案的选择与确定进行了讨论．探讨了在技术改造中，现有工艺设备多，车间空间狭小时，进行除尘系统设计采用火工除尘系统的设计问题．     

弯曲载荷作用下薄板的金属尘化腐蚀模型

基于Fick扩散第二定律及扩散热力学,推导得到扩散和外载荷因素耦合作用下的扩散方程,并以薄板为对象,差分求解得到尘化腐蚀过程中不同σ珟ho值时基于2种扩散模型内部瞬时碳浓度分布图,通过Cr5Mo钢的尘化腐蚀试验数据进行验证,理论计算与试验结果的一致性表明:推导得到的M-Fick2模型可描述载荷作用下金属尘化腐蚀扩散过程;弯曲载荷作用下,M-Fick2中修正项系数σ珟ho值越大,对扩散的影响也就越大;在弯曲载荷作用下,对扩散除了具有加速的作用外,还包括抑制的作用,当σ珟ho≤0.01时对扩散的加速作用和抑制作用都不显著。     

荷电气-固两相流动与静电喷粉研究进展综述

评述荷电气-固两相流动与静电喷粉研究现状．着重介绍颗粒的荷电机理，气-固两相流动研究的理论、实验，激光多普勒测速技术在气-固两相流动研究中的实验技术以及静电喷粉装置与沉积特性．最后提出目前静电喷粉技术有待研究的问题．     

DEM/CFD modelling of the deposition of dilute granular systems in a vertical container

Deposition of granular materials into a container is a general industrial packing process. In this study, the deposition behaviour of dilute granular mixtures consisting of two types of particles that were of the same particle size but different particle densities in the presence of air was numerically analyzed using a coupled discrete element method （DEM） and computational fluid dynamics （CFD）. Bilayer granular mixtures with light particles at bottom and heavy particles at top were first simulated. It was found that the presence of air significantly affected the flow behaviour of the bilayer mixtures. For the system with a relatively low initial void fraction, the air entrapped inside the container escaped through the dilated zones induced due to the friction between the powder bed and wall surfaces. The escaping air streams entrained light particles that were originally located at the bottom of the granular system. Consequently, these light particles were migrated to the top of the granular bed at the end of deposition process. More light particles were migrated when the deposition distance was increased. For the system with a high initial void fraction, some light particles penetrated into the top layer of heavy particles and created a mixing zone. Deposition of random mixtures with different initial void fractions was also investigated and the influence of initial void fraction on the segregation behaviour was explored as well. It was found that the increase of void fraction promoted segregation during the deposition in air. It was demonstrated that, for granular mixtures consisting of particles of different air sensitivities, the presence of air had a significant impact on the mixing and segregation behaviour during the deposition.     

强热源诱导含尘浮射流的浓度示踪及捕集效率

通过对强热源诱导含尘浮射流各影响的分析,根据相似理论,简化了实验过程,用ＣＯ２作为示踪剂模拟开敞大空间中强热源诱导的瞬态扬尘过程的浓度变化,通过对捕集效率的实验研究,探讨了该实验技术的适应范围、优点及局限性。     

露天钻机新型除尘系统的研究

钻机除尘对于延长钻机使用寿命、保证作业人员的身体健康至关重要。目前，矿山钻机使用的除法系统存在一定的弊端，本文提出的新型除尘系统吸收了现存除尘系统的优势，为露天钻机除尘提供了新途径.本文还对新型除尘系统中文氏管的结构参数、文氏管的喉管流速和文氏管的用水量及压力损失等参数进行了探讨。