Sulfur fixation during coal gasification: Fid-Bau Portal

Sulfur fixation during coal gasification

Schuhmann, R. jun. / Spitzer, R.H. / Mehta, A.J.

Research active ities are reported on the development of basic engineering data for design of a coal gasification process in which the sulfur is fixed and separated in chemical combination with iron. Thermodynamic calculations and phase equilibrium studies were conducted for the ternary condensed systems Fe-O-S and Fe-C-S, and for equilibria of condensed phases in these systems with gases containing various combinations of C, O. H. and S. These studies showed that iron oxides, metallic iron, and iron silicates should be effective sulfur fixation agents over wide ranges of gas compositions and gasification temperature, both below and above the melting point of iron sulfide. A steady state, isothermal, fixed-bed laboratory technique was developed for quantitative study of the kinetics of reactions of gases with particulate solids. This procedure was used to measure specific reaction rate and rate constants for sulfur fixation with iron as a function of temperature and iron oxide particle size. A jet-fluidized reactor, constructed and patented by the principal investigator, provided a successful simulation of combined gasification and sulfur simulation of combined gasification and sulfur fixation with iron at temperatures for which the sulfur fixation product was a molten iron oxysulfide. (Stoehr)