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- W3047579367 abstract "Production of high Btu fuel gas from coal gasifiers involves a methanation step that can be complicated by formation and build-up of C in the methanation reactor. Carbon deposits can deactivate catalysts, plug reactors, and reduce efficiency of C conversion. Carbon deposition isotherms for ideal graphite and non-ideal C in equilibrium with gaseous CO, H/sub 2/, CH/sub 4/, CO/sub 2/, and H/sub 2/O were calculated and compared for the range 600 to 1200/sup 0/F and for pressures from 1 atm to 1000 psia. Catalysts that tend to preclude formation of graphite in favor of non-ideal C are advantageous since they permit operation over a wider range of conditions. For either type of C the equilibrium boundary for C formation can be regarded as a function of five variables - temperature, pressure, and atomic fractions of C, H, and O in the gas. For pilot plants and demonstration plants, it is recommended that during initial operation the H/sub 2//CO or steam/dry gas ratios be adjusted as necessary to ensure that the C in the gas does not exceed the equilibrium boundary for graphite. If the catalyst is believed to be one that precludes graphite formation in favor of non-ideal C, then the C in the gas should be gradually raised to demonstrate how close the non-ideal C boundary can be approached before C formation occurs. Experience gained in such plants will indicate whether any modifications should be made in the present commercial concept designs." @default.
- W3047579367 created "2020-08-10" @default.
- W3047579367 creator A5033746810 @default.
- W3047579367 date "1976-07-01" @default.
- W3047579367 modified "2023-09-26" @default.
- W3047579367 title "Carbon formation in methanators. Final report. Series No. I: E-8" @default.
- W3047579367 doi "https://doi.org/10.2172/7123874" @default.
- W3047579367 hasPublicationYear "1976" @default.
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