Thermodynamic equilibria of multicomponent gas mixtures

TL;DRAbstract

The combustion gas mixture in various coal-gasification processes generally consists of CO, CO/sub 2/, CH/sub 4/, H/sub 2/, H/sub 2/S, H/sub 2/O, and N/sub 2/. To evaluate the integrity of structural materials for application in a gasification environment, it is imperative to characterize the multicomponent gas mixture. An approach based on thermodynamic equilibrium among various molecular species in the gas mixture has been used to obtain the chemical potentials of O, C, and S in the gas streams over a wide range of gas compositions, pressures, and temperatures. Isopotential diagrams for O, S, and C are developed at different temperatures and pressures for a wide range of room-temperature gas compositions. The results show that the O and C potentials are uniquely established by the C/H and C/O atomic ratios in the gas mixture. In addition to these ratios, the S potential also depends on the C/S atomic ratio. The O and S potentials (presented as partial pressures of O/sub 2/ and S/sub

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