ISSN: 2250-3005 - ijcer

International Journal Of Computational Engineering Research (ijceronline.com) Vol. 2 Issue. 82.3.4 Estimation of coefficient ‘d S ’Coefficient d S can be expressed as in the following equation:dmds (25)dcpwhere, d cp can be defined as the specific heat ratio of CO 2 to SO 2 for different temperatures. Coefficient d Cp is estimatedby using Vapour Pressure Model. d m can be defined as the mass ratio of SO 2 to total flue gas [4]d cped151.16[ 2.6790.289ln(T )]T (26)m2KsSm (27)mtot. steo.mtot. steo.2.3.5 Calculation of coefficient ‘f A ’Coefficient f A is calculated for access air amount. Coefficient fA can be expressed as in the following equation f . C(28)fA m P,ACfT 0.051P, A 0.71241.000011T(29)m. steo.(n 1)airm (30)mfluegas2.3.6 Calculation of C p,CC p,C denotes the specific heat of CO 2 . Specific heat value of CO 2 is given by [5] and adopted as a new parabola by usinghoerl model.C P,C = (0.1874) × 1.000061 T × T 0.2665 (31)3.2.4. Flue gas specific exergy valueThe flow exergy of flue gas can be expressed in the ratio form as [6] h h ) T( s )(32)(0 0s0where is the flow exergy or the availability of stream flow neglecting K.E & P.E, s is the specific entropy a nd thesubscript zero indicates the properties at the dead state of P 0 and T 0 .Entropy difference can be expressed in the form assRTP s0 Cpln Rave.ln(33)T0P0KC( 0.6927) KN(0.2968) KH(4.1249) KS(0.2596) KM(0.4615) mair. steoavemfluegasmair. steo.( n 1)(0.287))mfluegas(0.2201)where, R ave is the average universal gas constant value of flue gas. Each gas has different gas constant. So, the averageuniversal gas constants of combustion products are calculated and given in Eq. (35) [6]T P Cp,fluegas(T T0) T0( CP,fluegasln Rave.ln)(35)T0P0T Rave.P Cp,fluegas(T T0) T0Cp,fluegas(ln ln )T C P (36)0p,fluegasT Rave.P Cp,fluegas[(T T0) T0(ln ln )](37)T C P0p,fluegasWhen P ≡ P 0,General exergy flow equation can be written as:0Issn 2250-3005(online) November| 2012 Page 130(34)