tailieunhanh - Orr, F. M. - Theory of Gas Injection Processes Episode 3

Tham khảo tài liệu 'orr, f. m. - theory of gas injection processes episode 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . FLASH CALCULATION 31 Table Peng-Robinson Binary Interaction Parameters 99 18 Component CH4 C2 C3 CO2 N CH4 C2 C3 C4 C5 C6 C7 C8 C9 C10 C12 C16 C20 in subsequent chapters. Interaction parameters for CO2 are those recommended by Deo et al. 18 . Otherwise Table reports values of ỗij recommended by Peng and Robinson 99 . Eqs. provide the description of volumetric behavior needed to complete the calculation of the partial fugacity of a component in a mixture. Differentiation of Eq. gives an expression for dr . That expression is then substituted into Eq. and the integration is performed. The result after considerable algebraic manipulation is dj j ln iij b z -1 - ln H1 - V D xij m J am bi 2 í 1 ự2 1 V A W2 ZrJ ựm am k ixkj aa ik ln 1 - ự2 - 1 V J Flash Calculation The result of the thermodynamic analysis and the use of an equation of state to describe volumetric behavior is a set of nonlinear equations Eqs. in which each value of fij is given by an expression like Eq. that must be solved for the compositions of the phases. The following procedure can be used 1. Estimate composition xij of each of the phases present. 2. Solve Eq. for the molar volume V of each phase. 3. Use Eq. to calculate the partial fugacity f for each component in each phase. 32 CHAPTER 3. CALCULATION OF PHASE EQUILIBRIUM 4. Check to see if component partial fugacities are equal in all of the phases Eq. . If not then adjust the estimates of phase compositions and return to step 2. While this procedure will give the compositions of phases that satisfy the requirement that .