大气污染控制Lecture 6-1 Air Pollutant Concentration Models.ppt

Air Pollution Questions for the Last Lecture Important meteorology elements on air pollution Factors that affect vertical motion Other two factors that affect vertical motion Other two factors that affect vertical motion Lecture 6 Air Pollutant Concentration Models Ⅰ What is Air pollutant Concentration Models? The perfect pollutant concentration models would allow us to predict the concentrations that would result from any specified set of pollutant emissions, for any specified meteorological conditions, at any locations, for any time period, with total confidence in our prediction. Ⅰ What is Air pollutant Concentration Models? Materials Balances Ⅱ Fixed-box models (1) Simplifying assumptions (1) Simplifying assumptions (2) Fixed-box concentration equation (2) Fixed-box concentration equation (2) Fixed-box concentration equation (3) Some applications of fixed-box models (3) Some applications of fixed-box models Ⅲ Gaussian Diffusion Models (高斯扩散模型) Assumptions Assumptions ⑤ assumption that the plume is emitted from a point with coordinates ( 0 , 0 , H ) H – effective stack height h – physical stack height - plume rise ⑥ a no buoyant pollutant at emission rate Q (normally in g/s). ⑦ velocity u , independent of time . (2) materials balance derivation equation (2) materials balance derivation equation (2) materials balance derivation equation (2) materials balance derivation equation （3） Gaussian puff ,three-dimensional spreading equation (4) Gaussian plume , two-dimensional spreading equation (4) Gaussian plume , two-dimensional spreading equation (4) Gaussian plume , two-dimensional spreading equation This Lecture and the Next Lecture Homework DISCUSSION * 1. Which two meteorological factors have great effect on air pollution transportation? 2. Which two factors ( or parameters ) affect vertical motion in the atmosphere ? 3. Which two parameters can describe the temperature change of the air parcel and the