Fuel rich sulfur capture in a combustion environment
A major concern associated with the combustion of coal for heat and electricity is the emission of acid rain precursors, NO/sub x/ and SO/sub 2/. Dry calcium based sorbent injection is a potential method for reducing SO/sub 2/ emissions from existing coal-fired boilers. A great deal of study has been devoted to the fuel lean SO/sub 2/ reaction: CaO + SO/sub 2/ + 12O/sub 2/ ..-->.. CaSO/sub 4/ The fuel rich analogies: CaO + H/sub 2/S ..-->.. CaS + H/sub 2/O, CaO + COS ..-->.. CaS + CO/sub 2/ are kinetically faster than the SO/sub 2/ reaction. The fuel rich reactions have not been extensively studied particularly under combustion conditions. In this study a refraction lined, down fired natural gas furnace was used to study fuel rich sulfur capture as a function of sulfur concentration (750-3000 ppm), molar ratio of calcium to sulfur (CaS = 1 to 4), residence time (0.30 to 0.65 sec), quench rate (450 to 900/sup 0/Fsec), stoichiometric ratio in the rich zone (SR = 0.65, 0.75), and sorbent type (Marblehead hydrate and Fredonia carbonate). The fuel rich sulfur species H/sub 2/S and COS were monitored in a near continuous fashion using a gas chromatograph equipped with a flame photometric detector (GC-FPD) and an automatic sampling system which sampled every 30 seconds. Below the fuel rich zone, 25% excess air was added and the ultimate fuel lean capture was measured using a continuous SO/sub 2/ monitor. Under fuel rich conditions calcium utilization increases with increasing sulfur concentration and decreasing CaS. The results on the lean side are very typical of lean capture data reported by others; i.e. the calcium utilization is weakly dependent on CaS and sulfur concentration.
- OSTI ID:
- 5244044
- Report Number(s):
- CONF-870484-
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evaluation of fundamental phenomena associated with NO/sub X/ control and sulfur capture in slagging precombustors
CaO interactions in the staged combustion of coal. Fifth quarterly technical progress report, October 1, 1981-December 31, 1981
Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AIR POLLUTION CONTROL
ALKALINE EARTH METALS
BOILERS
CALCIUM
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION KINETICS
COMBUSTION PRODUCTS
CONTROL
DESULFURIZATION
ELEMENTS
EMISSION
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
FURNACES
GAS FUELS
GASEOUS WASTES
GASES
KINETICS
MATERIALS
METALS
NATURAL GAS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
SORPTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
WASTES
YIELDS