Comparative evaluation of high- and low-temperature gas cleaning for coal gasification--combined cycle power systems. [25 refs]

Technical Report · Fri Apr 01 04:00:00 EST 1977

DOI:https://doi.org/10.2172/7111997· OSTI ID:7111997

Jones, C. H.; Donohue, J. M.

The purpose of this screening study was to evaluate the incentives for developing hot gas purification technology for application to coal gasification-combined cycle power generating systems. The iron oxide process currently being developed by the Morgantown Energy Research Center for removal of hydrogen sulfide at high temperature (1,000/sup 0/F) was selected for this study. Process and economic evaluations were performed for five different coal gasification schemes, i.e. air and oxygen blown dry ash, moving bed Lurgi gasifiers; oxygen blown slagging, moving bed gasification currently being developed by the British Gas Corporation; and oxygen and air blown two-stage entrained gasifiers proposed by Foster Wheeler. For each of the above gasification schemes, four complete system flowsheets were developed for converting Illinois No. 6 coal to electricity via combined cycle power generation. Two of these processing schemes were based on high temperature iron oxide technology with gas turbine inlet temperatures of 1,950 and 2,400/sup 0/F. The other two flowsheets for each gasifier incorporated the low temperature Benfield process with gas turbine inlet temperatures of 1,950 and 2,400/sup 0/F. The results of this study indicate that there is a large economic incentive for developing hot purification technology for dry ash Lurgi gasification systems. For advanced gasification schemes such as the BGC slagger or the two-stage entrained gasifier, no incentive could be identified for the development of high temperature iron oxide gas cleaning technology. Major technical questions that were raised concerned problems associated with the regeneration of iron sulfide, the fate of trace contaminants such as ammonia and alkali metal vapors in the system, as well as the ability to remove particulates from the gas streams both before and after contacts with the iron oxide absorption equipment.

• Research Organization: Stone and Webster Engineering Corp., New York (USA)
• OSTI ID: 7111997
• Report Number(s): EPRI-AF-416
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
20 FOSSIL-FUELED POWER PLANTS
200102 -- Fossil-Fueled Power Plants-- Power Cycles
CHALCOGENIDES
CHEMICAL REACTIONS
COAL GASIFICATION
COMBINED-CYCLE POWER PLANTS
COST
DESULFURIZATION
DIAGRAMS
ECONOMICS
ENERGY SOURCES
FINANCIAL INCENTIVES
FLOWSHEETS
FLUIDS
FUEL GAS
FUELS
GAS FUELS
GASES
GASIFICATION
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
IRON OXIDES
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
REMOVAL
SORPTION
SORPTIVE PROPERTIES
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS