A process scheme for H/sub 2/S removal from a fixed-bed gasifier gas stream

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6595938

Reuther, R B; Bissett, L A; Strickland, L D

Integrated Gasification Combined Cycle (IGCC) systems are emerging as an important alternative technology for power generation. Methods to remove hydrogen sulfide from the product gas at elevated temperatures are necessary, however, in order to improve the process thermal efficiency of these systems. Studies with zinc ferrite and certain other metal oxides are showing promise in achieving this goal. However, to be a viable concept, the sulfur dioxide created during regeneration of the solid reactant back to the oxide(s) must be converted into a usable or disposable form. One possible process scheme to accomplish this may be to recycle the regeneration offgas stream to the gasifier where the sulfur dioxide can be captured as calcium sulfate and removed in the ash. This paper reports on activities associated with the development of an integrated process scheme utilizing a pressurized, fixed-bed gasifier coupled with a zinc ferrite desulfurization unit. Results from recent tests at the Morgantown Energy Technolgoy Center in which sulfur dioxide was injected into the bottom of a fixed-bed gasifier show that significant fixation of sulfur in the ash is possible with calcium-based sorbents. However, the capacity of the gasifier to fix sulfur in the ash must surpass a minimum level, which varies with operating parameters, in order for the integrated system to work. Also, the details of the zinc ferrite regeneration operation can have a significant impact upon the viability of the integrated process. Test results and their impact on the operation of an integrated system is discussed.

• OSTI ID: 6595938
• Report Number(s): CONF-871113-
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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
ADSORBENTS
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMICAL REACTORS
CONTROL
DESULFURIZATION
EFFICIENCY
EQUIPMENT
FERRIMAGNETIC MATERIALS
FERRITES
FLUE GAS
GASEOUS WASTES
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REGENERATION
REMOVAL
SULFATES
SULFIDES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL EFFICIENCY
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES
YIELDS
ZINC COMPOUNDS