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February 24, 2009, 20:44 |
Coal Devolatilisation
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#1 |
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Firstly thankyou to anyone that responds to my question. Your help is greatly appreciated.
My question relates to the two competing rates devolatilisation model. I am modelling pulverised coal fired through an swirling burner into a furnace. I have information on the proximate and ultimate analysis and high temperature volatile yield of the coal. I am using the two mixture fraction/PDF approach and defining the volatiles as the emperical secondary stream. When I set values for the mass fraction of each element should I take into consideration the high temperature yield or just use the values from the ultimate analysis. From what I understand my coal flame does not necessarily achieve the high temp yield but is probably more than the proximate analysis yield that is found under slow(???) heating conditions. Also should I keep the second weighting factor as 1 or set it to the high temp yield fraction that I know. Thanks again for any help. I am stuck as to where to go with this. |
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