Advanced gasifier-desulfurizer process development for SNG (substitute natural gas) application. Final report, August 1987-December 1988

Technical Report · Thu Jun 01 04:00:00 EDT 1989

OSTI ID:5590063

Blinn, M B; Cover, A E; Haldipur, G B; Datta, S C; Holmgren, J D

KRW conducted investigations of calcium-promoted coal pyrolysis and gasification by means of bench-scale studies and an oxygen-blown PDU test. Results were used in a design study of a commercial KRW gasifier-desulfurizer, operating on Pittsburgh No. 8 coal and limestone for production of SNG. Bench-scale fluid-bed reactor studies were conducted with various fluidizing gases at temperatures and pressures of 1650 to 1950 F and 40 to 450 psig, with and without limestone, to give methane-yield and tar-yield data. The gasification kinetics studies of chars produced gave data which showed that limestone increases char reactivity and exerts a catalytic effect. Methane yields correlated exponentially to pressure. The bench-scale test results lead to an expectation that feeding some of the coal to the upper portion of the gasifier will increase methane yield and decrease oxygen consumption. In two PDU test-set points, expected operability and performance of the oxygen-blown gasifier-desulfurizer were confirmed. In Set Point 2, in-bed desulfurization efficiency was 88% and the product-gas higher heating value was 302 Btu/scf. The test results provided inputs to the design study of a KRW gasifier-desulfurizer island for production of 125 MM Btu/day of SNG. Results included a 4 to 6% improvement in feedstock inputs when compared to an earlier GRI-sponsored study. Methane yield decreased but the number of operating gasifier-desulfurizers remained at five. Equipment costs are expected to remain well within the previous + or - 25% cost estimate.

• Research Organization: KRW Energy Systems, Inc., Pittsburgh, PA (USA)
• OSTI ID: 5590063
• Report Number(s): PB-89-232631/XAB; KRW--89-001
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ALKANES
CATALYSTS
CHARS
CHEMICAL REACTIONS
COAL GAS
COAL GASIFICATION
DECOMPOSITION
DESULFURIZATION
DOCUMENT TYPES
ENERGY STORAGE
ENERGY TRANSFER
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HIGH BTU GAS
HYDROCARBONS
KINETICS
KRW GASIFICATION PROCESS
METHANE
ORGANIC COMPOUNDS
PROGRESS REPORT
PYROLYSIS
PYROLYSIS PRODUCTS
STORAGE
THERMOCHEMICAL PROCESSES
YIELDS