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High Efficient Ventilation System of Metallic for Conservation of the Working Environment in a Fabrication Shop

用于保护制造车间工作环境的高效金属通风系统

基本信息

批准号：
14350522
负责人：
FUKUCHI Nobiiyoshi
金额：
$ 5.95万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Recently, the present working environment tends to be reconsidered with high interest in the environmental problem. Especially, air pollution by generating metallic fume during the progress of cutting and welling is the unavoidable issue for labor health. For settling this matter, it is necessary to design the suitable ventilation system that is desirable to be generally composed of large scaled equipments with high efficiency due to big capacity of a fabrication shop. However, the physical property and movement characteristic of fume as minute particles have not been grasped accurately even now.In this study, with a view to establishing the ventilation system with perfect control of fume flow, the transportation phenomena on fume, that are assumed minute particles to be gas-phase in turbulent flow by driving vent fans, would be clarified using experimental means and numerical calculation.Hence, the numerical analysis on the turbulent diffusion state of heat and fume, in which it has tendency to form those stagnant in absence of advection effect on turbulent gas flow, are carried out by k-ε model based on SIMPLE algorithm. Also, the experimental simulations of fume diffusion using pigmented salt water in the quasi-two dimensional models of fabrication shop are executed with the appropriate similarity law.Furthermore, the experimental simulations of fume diffusion using smoke generator in the three dimensional models of fabrication shop are executed with the appropriate similarity law. And the experimental result of fume flow shows considerably good agreement with, the calculated data using two-layers Zone model on the diffusion state of heat and fume. The relation between the ventilation system and the fume transportation state in a fabrication shop is investigated evidently using experimental data.

最近，人们对环境问题的高度关注使人们开始重新考虑目前的工作环境。特别是在切割和焊接过程中产生的金属烟雾对空气的污染是劳动者健康不可回避的问题。为了解决这个问题，有必要设计合适的通风系统，由于制造车间的大容量，通常希望由大型设备组成，并且效率高。然而，至今为止，人们还没有准确地掌握烟气作为微小颗粒的物理性质和运动特性。本研究以建立完善的烟气流动控制的通风系统为目的，通过实验手段和数值计算，对驱动排风机时，假设微小颗粒为气相的湍流烟气的输送现象进行了研究。采用基于SIMPLE算法的k-ε模型，对无平流作用的湍流气流中热量和烟气的湍流扩散状态进行了数值分析。采用合适的相似律，在准二维模型的加工车间中进行了含色素盐水烟气扩散的实验模拟，并在三维模型的加工车间中进行了含色素盐水烟气发生器烟气扩散的实验模拟。烟气流动的实验结果与采用双层区域模型计算的烟气和热量扩散状态吻合较好。本文通过实验数据，对车间通风系统与烟气输送状态的关系进行了较为深入的研究。