Surrogate fuels exploratory tests. Volume II. High temperature, pressurized sulfur capture by calcium-based sorbents. Final report, 30 September 1983-30 September 1984
The principal objective of this project was to perform bench-scale experiments to determine the effect of pressure on the SO/sub 2/ sorption rate and on the extent of sorbent utilization. Experiments were performed in a pressurized, fixed-bed reactor employing simulated combustor gas compositions. The experiments covered a range of sorbent types (limestone, dolomite), sorbent sizes (10 to 500 ..mu..m diameter), and system pressures (1 to 10 atm) in the range of interest for heat engine applications. The data obtained in the experimental part of the project were used to extend the range of validity of an available porous sorbent model to include small particles and high pressures. Then, the validated porous sorbent sorption model was used to establish the feasibility of SO/sub 2/ removal from heat engines via several sorbent injection approaches. A parametric modeling study of sulfur sorption by calcined limestone in a high pressure (10 to 30 atm) environment was undertaken to determine the feasibility of in-situ sulfur removal from coal-fired gas turbine combustors. The study has shown that high pressures prevent effective in-situ calcination while high SO/sub 2/ partial pressures enhance the rate of CaSO/sub 4/ product deposition. The work described herein illustrates the conditions whereby a goal of 50% or greater sulfur reduction within 300 to 500 ms residence time may be achieved. The requirements include: Calcium-to-Sulfur (Ca/S) molar ratios of at least three; injection of small (approx. l ..mu..m) diameter sorbent particles; an external calcination device operating at relatively low temperature (750 to 850/sup 0/C) and total pressures (nominally atmospheric) to achieve specific internal surface areas of the sorbents in the range of 50 m/sup 2//g to 100 m/sup 2//g; and sorbent injection into a combustor operating at nominal temperatures of 1100/sup 0/ to 1200/sup 0/C and 30 atm pressure. The basis for these conclusions is described. Certain caveats are noted. 53 references, 32 figures, 5 tables.
- Research Organization:
- Physical Sciences, Inc., Andover, MA (USA)
- DOE Contract Number:
- AC21-83MC20486
- OSTI ID:
- 6145877
- Report Number(s):
- DOE/MC/20486-1711-Vol.2; PSI-TR-435-Vol.2; ON: DE85005426
- Country of Publication:
- United States
- Language:
- English
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