Regenerative process for desulfurization of high temperature combustion and fuel gases. Quarterly progress report No. 5, April 1--June 30, 1977
The sulfation rate of reagent-grade monocalcium silicate is of the same order of magnitude as that of limestone and higher than that of reagent-grade calcium oxide. It has been confirmed that the sulfated monocalcium silicate is more regenerable than the sulfated lime, i.e., the regeneration rate is higher with the silicate. X-ray diffraction and IR absorption results indicate that silica is chemically bonded to the calcium sulfate in the sulfated calcium silicate. Construction of a micro-pilot rotary kiln for regeneration of lime from the sulfated lime has been completed. The Brookhaven processes for regeneration using fly ash from FBC will be tested with this device. Design and construction of a micro-combustor which will be used to test the regenerated lime are underway. Studies on sulfation of lime continue. Sodium chloride, although catalyzing the sulfation rate, yields too much chloride in the gas phase (60 percent NaCl at 900/sup 0/C), which can chlorinate the metals and metal oxides in the combustor. The catalysis by Fe/sub 2/O/sub 3/ and/or coal ash has been established and its mechanisms have been studied. Effects of the calcination conditions on sulfation are being studied. A process flow diagram for producing commercial strength sulfuric acid from regenerator off-gas has been prepared. The process would be used in conjunction with BNL's process for regenerating CaO from CaSO/sub 4/ using carbon as a reductant. A preliminary comparison between a once through sorbent system and the combined regenerative/H/sub 2/SO/sub 4/ system indicates that the net energy outputs (useful) of the two systems are approximately the same. The quantity of solid wastes generated by the once through system is about 2.5 times the quantity generated by the combined system.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 5231844
- Report Number(s):
- BNL-50706
- Country of Publication:
- United States
- Language:
- English
Similar Records
Regeneration of lime for fluidized-bed combustion with carbon, with silica, and with coal ash. [6 refs]
Regenerative process for desulfurization of high temperature combustion and fuel gases. Quarterly progress report No. 6, July 1--September 30, 1977
Related Subjects
ADSORBENTS
REGENERATION
CALCIUM OXIDES
CHEMICAL REACTIONS
CALCIUM SILICATES
FLUE GAS
DESULFURIZATION
FUEL GAS
SULFUR DIOXIDE
SORPTION
CALCINATION
FLY ASH
INFRARED SPECTRA
LIMESTONE
NET ENERGY
RECOVERY
SODIUM CHLORIDES
SOLID WASTES
SULFURIC ACID
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBONATE ROCKS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
ENERGY ANALYSIS
ENERGY SOURCES
FLUIDS
FUELS
GASEOUS WASTES
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RESERVOIR ROCK
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SPECTRA
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
010402 - Coal
Lignite
& Peat- Purification & Upgrading