Hot-gas desulfurization. I. Use of gasifier ash in a fixed-bed process. Final report

Technical Report · Tue Apr 01 00:00:00 EST 1980

OSTI ID:6628451

Schrodt, J T

A method for removing gaseous sulfur compounds from coal-derived fuel gases through their reaction with the iron in gasifier coal ash has been thoroughly researched, and the results have been applied for design of a commercial scale, fixed-bed, desulfurization process. Ashes with 5-23 weight percent iron oxide have been used in small reactors to sorb hydrogen sulfide from synthesized low-Btu fuel gas. Carbonly sulfide and carbon disulfide are also removed indirectly after hydrogenation to hydrogen sulfide. Results show sulfide removal efficiencies in excess of 99 percent and ash sulfide capacities up to 5.8 weight percent. A mixture of sulfur dioxide and sulfur is recovered during regeneration of spent ashes. Cyclic use of ashes improves their overall sorption reaction rate efficiency and performance. Models have been developed, verified and used to simulate operation of commercial-scale reactors. Preliminary design of a fixed bed process suitable for desulfurization of 43 MM SCF/HR of fuel gas calls for simultaneous use of six 25 x 15 ft diameter desulfurization reactors and two regeneration reactors of equal size. The estimated plant investment is 17.5 million dollars with an annual operating cost of 4.4 million dollars that is completely offset by a 20 dollar per ton credit for by-product sulfuric acid.

• Research Organization: Kentucky Univ., Lexington (USA). Dept. of Chemical Engineering
• DOE Contract Number: AS05-76ET10463
• OSTI ID: 6628451
• Report Number(s): DOE/ET/10463-T1(Vol.1)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ASHES
SORPTIVE PROPERTIES
WASTE PRODUCT UTILIZATION
COAL GASIFICATION PLANTS
FUEL GAS
DESULFURIZATION
HOT GAS CLEANUP
ADSORPTION
CARBON OXYSULFIDE
CARBON SULFIDES
COAL GASIFICATION
EXPERIMENTAL DATA
HYDROGEN SULFIDES
IRON OXIDES
PHASE DIAGRAMS
RECOVERY
REGENERATION
SULFURIC ACID
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
DIAGRAMS
FLUIDS
FUELS
GAS FUELS
GASES
GASIFICATION
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
INORGANIC ACIDS
IRON COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PURIFICATION
RESIDUES
SORPTION
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
010402* - Coal
Lignite
& Peat- Purification & Upgrading
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
010404 - Coal
Lignite
& Peat- Gasification
010800 - Coal
Lignite
& Peat- Waste Management