CaO interactions in the staged combustion of coal. First quarterly technical progress report for the period September 23-December 31, 1980

Technical Report · Fri Jan 30 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6671445· OSTI ID:6671445

Levy, Arthur; Merryman, Earl L.

It is widely recognized that alkaline oxides, especially CaO, can be most effective in capturing sulfur in-situ. It is equally well recognized that NO/sub x/ emissions due to fuel-bound nitrogen in coal can be effectively minimized with staged combustion. Both these aspects have been demonstrated separately at Battelle and other laboratories. It is the overall objective of this program to develop the basis for optimizing sulfur capture by CaO under staged combustion. Our approach to accomplishing this goal is via an experimental and interpretative study of the chemistry and interactions of CaO under simulated and actual staged combustion conditions. In staged combustion one fires first under reducing (fuel rich) conditions prior to oxidation in the second stage. Our studies wherein coals were treated with CaO, i.e., impregnated with CaO for pulverized coal firing, or mixed and pelletized with CaO for stoker firing, suggest that conditions prevail under which CaO is first converted to CaS prior to being oxidized to CaSO/sub 4/. Since CaS has a greater thermal stability than CaSO/sub 4/, it is therefore possible to fire at temperatures above 900/sup 0/C (1650/sup 0/F) and retain sulfur under proper stoichiometric conditions. The program is aimed at defining the chemistry and combustion kinetics necessary to optimize the sulfur capture with the ultimate application of reducing SO/sub 2/ and NO/sub x/ in the firing of pulverized coal.

• Research Organization: Battelle Columbus Labs., OH (USA)
• DOE Contract Number: AC22-80PC30301
• OSTI ID: 6671445
• Report Number(s): DOE/PC/30301-1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
ELEMENTS
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FREE ENERGY
FUEL-AIR RATIO
FUELS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
POLLUTION CONTROL
RETENTION
SULFIDES
SULFUR
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS