ISSN: 2250-3005 - ijcer

International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 82.3. Calculation of flue gas specific heat capacityThe specific heat values of gases found in flue gas are required to be known in order to obtain the averagespecific heat capacity (C p ) of flue gas. Taking these values from thermodynamic tables, a model is formed. The referencecombustion reaction is required to generate one formulation in energy balance. Since carbon is an element found almost inall fossil fuels, the combustion reaction is considered to be a reference reaction for the model. Then, the specific heatvalues of all gases are defined depending on carbon dioxide. For that purpose, model coefficients are defined andexpressed in detail as follows (Coskun et al., 2009).Cp,C mtot. steo.Cp,fluegas fA(17)( a b c d ) mCNHSfluegasa, b, c, d and f are the model coefficients in Eq. (3.17). C p , flue gas represents the average flue gas specific heat value. C p , C isthe specific heat of CO 2 .2.3.1 Estimation of coefficient ‘a c ’Calculation method of a c is given by the following equation:amac (18)acpwhere, a cp can be defined as the specific heat ratio of CO 2 to CO 2 . So,a cp equals to 1. a m can be indicated as the mass ratio of CO 2 to flue gas for n =1.ammm3.667K (19)cCtot. steomtot. steo.2.3.2 Estimation of coefficient ‘b N ’From (Coskun et al., 2009), calculation method of b N is given by the following equation:bmbN (.20)bcpwhere, b cp can be defined as the specific heat ratio of CO 2 to N 2 for different temperatures. Coefficient b cp is estimated byusing heat capacity model. b m can be defined as the mass ratio of N 2 to total flue gas.4 11135b cp 0.9094 1.6910T2TmNbmmbtot.steo.0.767(2.9978. K 0.3747 K 0.3747 K K) (11.445) KHOS CNm (.21)mtot. steo.2.3.3 Estimation of coefficient ‘c H ’Coefficient „c H ‟ can be expressed as in the following equation:cmcH (22)ccpc cpcm6 10465 0.5657 6.6810T2TmH8.938KH KMmm (24)tot.steo.tot.steo.(23)Issn 2250-3005(online) November| 2012 Page 12