Combination Of Multiple Sources Of Pollutions Effect On Concentration Distribution Of Indoor Pollutants Of Industrial Building

With the rapid improvement of our country’s industrial level, large amounts of pollutants which exist in the process of industrial production are increasingly endangering our life and the environment pollution is a problem which need to be solved urgently in the 21 st century.The pollutants which exist in the process of industrial production not only endanger human’s health but also influence the quality of products severely.Therefore, researching the regularities of distribution of gaseous pollutants lays the foundation of improving indoor air quality of industrial building.The research on indoor environmental impact at home and abroad is paid attention to various supply air flow which effects on concentration distribution of indoor pollutants rather than pollution emitting characteristics.The most research on pollution emitting aim at the uniform emission of indoor civil architecture. The research limit to a single pollution source instead of combined action.Therefore, this article studies on the effect which combination of multiple sources of pollutions impact on concentration distribution of indoor pollutants.The author observes the emitting of dual sources of pollution by experiment,research emitting characteristics of dual sources of pollution, analyze distribution character of indoor pollution and distribution character changing with time,conclude the concentration of two point above the sources of pollutions higher than other points and show a bimodal phenomena.At the same time, the concentration of the six measure points heightens as time goes by, and the bimodal phenomenon is existent andremarkable.In this paper, the method of Computational Fluid Dynamics(CFD) is employed here to simulate the two pollution sources emit respectively and simultaneously. By defining the concept of superposition difference, the difference between the numerical superimposed concentration field of the single pollution source and the concentration field of the double pollution source that emit simultaneously are analyzed. The numerical results show that the superimposed concentration of the single pollution source is larger than the concentration of the double pollution source as a whole, while above the source, the value of the later is larger than that of the former. Thus the multi sources cannot be treated as a simply superposition of several single sources.Furthermore, by increasing the emitting concentration of the source, the effect of concentration of the source on the superposition difference is summarized.At last, the changing elements, such as quantity,concentration, relative distance,altitude, impact on concentration distribution of indoor pollutants.If the total emitting grade is same, the concentration of indoor pollutant becomes higher when split a single source to more. At the same time, if you calculate the concentration of indoor pollutant with primary air volume, this will result in error and can’t meet requirements.It concludes that when the concentration of the source of pollutant becomes higher, the concentration of indoor pollutant becomes higher. And the concentration of the source of pollutant is principal element. So reducing the intensity of the source of pollution is the first thing when you want to control and solve the problem of indoor pollution.The more disperse the sources are, the higher the concentration of indoor pollutant is. The position of the maximum concentration will be lower, so people are more easily exposed to high concentration of pollution environment.The higher the attitude of the source of pollutant is discharged, the lower the concentration of the source of pollutant distributes near the ground. So when design and plan for the altitude of pollution source,people can increase the attitude of the source of pollutant reasonably to reduce the concentration near the ground and reduce local pollutant concentration within certain realms.