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A steam process for coal gasification

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  • Soo, S.L.
  • Gibbs, R.T.

Abstract

A gasification process has been studied using steam as a reactant as well as a heat source to generate hydrogen, carbon monoxide, and methane by using carbon in coal as a reducing agent. Economical operation (60–70% efficiency based on the heating value of coal) can be maintained by using a large excess in steam at 1300 C level (more than 4 mole of H2O to 1 mole C). This steam is produced by burning a fraction of the product gas in a pebble-heater system. A high percentage of H2 can be produced in the product gas without the need for shift conversion. Depending on the reactor pressure and temperature, other components of varying percentages are CO, CH4 with CO2 and H2S removed by absorption; excess H2O is removed by condensation. Heat removed in condensation is recovered in steam heating and feed water heating. Ash is removed in the reactors and fines in the condensate as condensation nuclei. Large excess steam converts all sulfur to H2S with final removal as raw sulfur. Charcoal and Illinois No. 6 coal were gasified in our laboratory facility at pressures up to 10 atm. Steam was heated in an electric arc heater to simulate the pebble heaters in the prototype. All flyash and tar was removed with the condensate.

Suggested Citation

  • Soo, S.L. & Gibbs, R.T., 1979. "A steam process for coal gasification," Energy, Elsevier, vol. 4(2), pages 357-364.
    • Handle: RePEc:eee:energy:v:4:y:1979:i:2:p:357-364
    DOI: 10.1016/0360-5442(79)90135-X
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    Cited by:

    1. Anufriev, I.S., 2021. "Review of water/steam addition in liquid-fuel combustion systems for NOx reduction: Waste-to-energy trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    2. Gradisher, Logan & Dutcher, Bryce & Fan, Maohong, 2015. "Catalytic hydrogen production from fossil fuels via the water gas shift reaction," Applied Energy, Elsevier, vol. 139(C), pages 335-349.

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