Evaluation of fundamental phenomena associated with NO/sub X/ control and sulfur capture in slagging precombustors

Conference · Sat Mar 01 04:00:00 EST 1986 · Energy Technol. (Wash., D.C.); (United States)

OSTI ID:5529612

La Fond, J F; Johnson, T R; Payne, R; McSorley, J A

The investigations described in this paper have been aimed at understanding capture of sulfur using calcium-based sorbents under fuel-rich precombustor conditions. These results can be summarized as follows: Under fuel-rich conditions, CaO reacts very quickly with H/sub 2/S and to a much higher level than CaO and SO/sub 2/ under corresponding fuel-lean conditions. At fuel-rich conditions that favor high carbon burnout (high temperature, near stoichiometric), sulfur evolves from the coal mainly as SO/sub 2/. Sulfur capture is enhanced by injection of the sorbent into lower temperature regions, probably due to less sorbent sintering when exposed to lower temperatures. Typical molten coal ash and mixtures of coal ash and CaO are incapable of holding large amounts of sulfur in a coal precombustor environment. Large amounts of Fe/sub 2/O/sub 3/ can help reduce the melting temperature of slag and increase the slag sulfur capacity but may be technically difficult to implement and economically impractical. Coal ash/CaO slags rapidly desulfurize from super-equilibrium levels of sulfur at precombustor temperatures and gas compositions. Additional testing is currently in progress, but the data collected so far indicates that attempts to capture sulfur by injection of dry sorbent in slagging precombustors will meet with several difficult obstacles. 13 references, 19 figures, 26 tables.

• Research Organization: Energy and Environmental Research Corp., Irvine, CA
• OSTI ID: 5529612
• Report Number(s): CONF-860303-
• Conference Information: Journal Name: Energy Technol. (Wash., D.C.); (United States) Journal Volume: 13
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REMOVAL
RESEARCH PROGRAMS
SLAGS
SULFIDES
SULFUR
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES