The Diffusion Property Of The Emissions Of Fine Particulate Matter In An Elevated Point Source About The Central Heating In Xi’an

There are obvious effects to save energy and protect environment of urban centralheating, so the construction and development of urban central heating has become a universalconcern of all the problems. In recent years, experts and scholars at home and abroad havedone a lot of theoretical analysis and numerical simulation research for the effect on urbanatmospheric environment of central heating, but research for the spread and superposition ofpollutants under the action of many chimneys in the city is less. This paper, taking xi ’an as anexample, studies the spread and superposition of Particulate matter under the action of manychimneys, in addition to propagation law of Particulate matter in the flue gas under the effectof size of the chimney outlet temperature and size of wind speed.Article analyzes the city central heating condition and pollution situation withinhigh-speed beltway in xi "an using the statistical method and combining heating survey;Contrast two heating survey data, this paper analyzes improvement of pollutants in the city;And comparison and analysis of the current coal dust prevention and control method arepresented; take sample of flue gas dust particles of a typical computer correspond to differentdust removal method; And analyze the particle size distribution to dust sampling using theWinner2308A type laser granularity instrument in the laboratory; Turn out that between0.32~0.62microns in diameter distribution, particle size distribution is connected with the type ofselected filters, that results as boundary conditions for the following calculation analysis;lastly select discrete particle model on the basis of the point pollution sources and thegas-solid two phase flow research both at home and abroad combining with the characteristicsof this topic research, using numerical simulation software FLUENT to study the spread ofthe Particulate matter in flue gas under the action of more chimneys, getting a influence ruleon the spread of the particles in different air velocity, chimney outlet temperature, the densityof particles through the condition of numerical analysis of particle transport for different airvelocity, the chimney outlet temperature, density, and analyze the superposition phenomenonfor many chimneys.This paper, taking xi ’an as an example, first proposed to do the calculation andanalysis more than about the present situation of urban chimneys discharge smoke spreadingthroughout, clearly see the distribution of atmospheric diffusion of smoke exhaust in the citycentral heating of city, and the aggravating phenomenon for pollution of many chimneys emissions superposition. The research results provide a reference basis for urban heatingplanning and health development.