Molten iron oxysulfide as a superior sulfur sorbent. Technical progress report, December 1, 1991--February 29, 1992
Slagging combustors with injected lime or limestone are being considered as replacements for conventional coal burners. They have advantages in that they can be staged to reduce NO{sub x} and SO{sub x} emissions. Iron oxide, as an alternative to lime or limestone may be effective not only as a desulfurizing agent, but under the right conditions of oxygen potential and after combination with sulfur, the reaction products of coal gases with iron oxide can act as a flux to produce a fluid phase. The thermodynamic conditions for optimum removal of sulfur from the first stage of a coal combustor are being determined by experiment and by use of existing data. Analysis of the phase equilibria indicates that optimum conditions for deployment of the reducing stage of a multi-stage, burner operating with iron injection are close to the boundary of the liquid iron oxysulfide phase with iron-saturation. Two prior investigations differ with respect to the location of this phase boundary at temperatures over 1400{degree}C: with reference 1, showing the phase boundary nearer the iron-rich corner than reference 2 which gives the boundary further into the liquid region. In this quarter experimental studies were conducted on equilibrium compositions which are the most effective in achieving desulfurization. These conditions were studied by thermogravimetric analysis (TGA). They serve to check the data reported by the two above-reference investigations for their experimental conditions of 1200{degree}C, and also to check extend the data given in the literature to a temperature of 1300{degree}C. The model used for this interpolation was reported upon in the prior quarterly report (9/1/91-11/30/92 Appendix A).
- Research Organization:
- Minnesota Univ., St. Paul, MN (United States). Inst. of Technology
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-89PC89778
- OSTI ID:
- 10173563
- Report Number(s):
- DOE/PC/89778-T11; ON: DE93019454
- Resource Relation:
- Other Information: PBD: 28 Feb 1992
- Country of Publication:
- United States
- Language:
- English
Similar Records
Molten iron oxysulfide as a superior sulfur sorbent. Technical progress report, June 1--August 31, 1992
Molten iron oxysulfide as a superior sulfur sorbent. Technical progress report, March 1, 1991--May 30, 1991