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 (90.87 KiB) Viewed 41 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 flare 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. The dispersion coefficients are given by the formulae below. btc Inx y = a-X and o, = d.*c+/-inx 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,