Regenerative process for desulfurization of high temperature combustion and fuel gases. Quarterly progress report No. 5, April 1--June 30, 1977

Technical Report · Sat Jan 01 04:00:00 EST 1977

DOI:https://doi.org/10.2172/5231844· OSTI ID:5231844

Steinberg, M; Yang, R T

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., Upton, NY (USA)
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 5231844
• Report Number(s): BNL-50706
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402 -- Coal
Lignite
& Peat-- Purification & Upgrading
010800* -- Coal
Lignite
& Peat-- Waste Management
ADSORBENTS
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SILICATES
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
DECOMPOSITION
DESULFURIZATION
DIFFRACTION
ENERGY ANALYSIS
ENERGY SOURCES
FLUE GAS
FLUIDS
FLY ASH
FUEL GAS
FUELS
GASEOUS WASTES
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFRARED SPECTRA
INORGANIC ACIDS
LIMESTONE
NET ENERGY
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RECOVERY
REGENERATION
RESERVOIR ROCK
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SILICATES
SILICON COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLID WASTES
SORPTION
SPECTRA
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFURIC ACID
WASTE PRODUCT UTILIZATION
WASTES
X-RAY DIFFRACTION