Removal of sulfur from hot coal-derived fuel gases in a high-pressure fluid-bed reactor

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:5805385

Jain, S C ^[1]; Gupta, R P; Gangwal, S K ^[2]

---

1. USDOE Morgantown Energy Technology Center, WV (United States)
2. Research Triangle Inst., Research Triangle Park, NC (United States). Center for Process Research

Integrated Gasification Combined Cycle (IGSCC) and gasifier/molten carbonate fuel cell (MCFC) power plants employing hot-gas cleanup are two of the most promising advanced technologies for producing electric power from coal. A key component of these plants is a hot-gas desulfurization system employing regenerable sorbents capable of removing sulfur-bearing species from coal gasifier gas down to a few parts per million by volume. Fluidized-bed hot-gas desulfurization reactors offer advantages in IGCC systems compared to fixed- and moving-bed reactors because of their ability to control the highly exothermic regeneration involved. However, a durable attrition-resistant sorbent ranging from 100 to 300 {mu}m in size is needed. Therefore, a technique was identified for manufacturing zinc ferrite and zinc titanate sorbents with high long-term chemical reactivity and mechanical strength for fluidized-bed applications. These sorbents were tested in a bench-scale, high-temperature, high-pressure, fluidized-bed reactor system capable of operating up to 350 psig and 850{degrees}C. Zinc ferrite sorbents were found to be limited to 550{degrees}C and moderately reducing gases beyond which excessive sorbent weakening was observed due to chemical transformations. Zinc titanate sorbents, however, exhibited excellent sulfur capacity, regenerability, and attrition resistance at temperatures up to 750{degrees}C with virtually no zinc loss despite the highly reducing nature of simulated coal gases used. The commercial applicability of the sorbent manufacturing technique was demonstrated by producing 100 kg batches of zinc ferrite and zinc titanate. The sorbent manufacturing technique is scalable by a factor of 400 with commercially available equipment.

• Research Organization: Research Triangle Inst., Research Triangle Park, NC (United States). Center for Process Research
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-88MC25006
• OSTI ID: 5805385
• Report Number(s): DOE/METC/C-92/7003; CONF-920310--5; ON: DE92009705
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COAL
COAL GASIFICATION
DESULFURIZATION
ENERGY SOURCES
FLUIDIZED BEDS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HOT GAS CLEANUP
IRON COMPOUNDS
MATERIALS
PURIFICATION
SORBENT INJECTION PROCESSES
SORPTIVE PROPERTIES
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS