Capture and retention of sulfur species by calcium compounds during the combustion of pulverized coal

Conference · Fri Jan 01 04:00:00 EST 1982 · Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:7054253

Case, P L; Heap, M P; McKinnon, C N; Pershing, D W; Payne, R

An investigation has been carried out in a bench scale facility to determine under which conditions sulfur species generated during the combustion of pulverized coal can be captured and retained by calcium-containing sorbents. Two series of experiments were carried out: one in which any capture would take place primarily under oxidizing conditions and the other in which significant residence times in the rich zone would allow capture under reducing conditions. Under oxidizing conditions the thermal environment experienced by the sorbent particle appears to be the dominant parameter controlling sulfur capture. This is probably because of dead-burning: if a sorbent particle's temperature exceeds a certain limit (which depends on the particular sorbent) the sorbent deadburns and loses its reactivity. The processes controlling capture and retention when the sorbent is maintained under reducing conditions for a prolonged time are more complex. The principle gas phase sulfur species are H/sub 2/S, SO/sub 2/ and COS and, even though the sulfur species are absorbed, the possibility that the sulfide will decompose during burnout exists. The tests indicate that there is the potential to remove greater than 50% of the input sulfur with Ca/S molar ratios of two when coal is burned under low NO/sub x/ conditions. Further work is necessary to insure that the controlling conditions can be achieved in practical combustors and that the sorbent injection does not adversely impact combustor performance.

• Research Organization: Energy and Environmental Research Corp., Santa Ana, CA
• OSTI ID: 7054253
• Report Number(s): CONF-820304-Vol.2
• Conference Information: Journal Name: Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States) Journal Volume: 27:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
014000 -- Coal
Lignite
& Peat-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHEMICAL REACTIONS
COAL
COMBUSTION
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
MATERIALS
OXIDATION
OXYGEN COMPOUNDS
PYROLYSIS
RETENTION
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES