A factory flare shown as A on the diagram below emits 60g/s of a pollutant into the air from an effective height of 30m.

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A Factory Flare Shown As A On The Diagram Below Emits 60g S Of A Pollutant Into The Air From An Effective Height Of 30m 1 (80.72 KiB) Viewed 54 times

A factory flare shown as A on the diagram below emits 60g/s of a pollutant into the air from an effective height of 30m. It is planned to extend the factory by building a second flare B at the same height 600m North from flare A. There is an existing housing development centred at point X on the diagram below, which is at the same ground level as the factory. The design wind speed is 0.75 m/s in an Easterly direction. a) Calculate the pollution level at X from flare A under Pasquill stability class B conditions (before flare b is operating) (5 Marks) b) Pick two other Pasquill stability classes and in up to 6 sentences explain what would be the difference in pollution movement. (6 marks) c) Once fiare B has been built the level of pollution at X is not allowed to more than double the value calculated in part a) above under the same conditions. Calculate the allowable flow of pollutant out of flare B (6 Marks) d) In up to 10 sentences, explain what weather conditions are needed to produce high levels of pollutants at ground level, and how can this be avoided by plant design? (8 marks) B Wind direction 600m X. 200m 1500m Diagram of flare layout, plan view. and o, = d-ze+finx The dispersion coefficients are given by the formulae below. btc inx Oy =a.x In these equations Oy and o, have units of metres and x has units of kilometres. The values of the parameters for Pasquill stability class B are; a = 154.7, b =0.8932, c= -0.006271, d = 109.8, e = 1.064 and f =0.01163.