Screening evaluation of electric power cycles integrated with coal gasification plants. [Steam-bottomed vs non-steam-bottomed cycles]

Technical Report · Sat Sep 01 00:00:00 EDT 1979

DOI:https://doi.org/10.2172/5884662· OSTI ID:5884662

Gallagher, S. P.; Ahner, D. J.

Potentially lower cost alternatives to present concepts for integrated gasification combined cycle power plants have been investigated. The study was initiated based on estimates which showed that steam-bottoming equipment would amount to 25 or 30% of the total capital cost of an integrated gasification combined cycle power plant. The capital saving of removing the steam system was obvious. The question remained whether the efficiency of a lower cost alternative could be high enough to make the system attractive. Consequently, a relatively simple, potentially low cost, non steam-bottomed cycle was evolved and the system thermal efficiency calculated. Thermal efficiencies were also determined for several steam-bottomed cycles. The non steam-bottomed cycle was found to have a thermal efficiency of 32%. However, attainment of this performance level depends on development of hot particulate removal equipment and high performance level depends on development of hot particulate removal equipment and high performance expander turbines beyond the current state-of-the-art. The steam-bottomed cycles analyzed in the study showed efficiency estimates between 38.8 and 40.3%, substantially higher than the non steam-bottomed case. High performance fuel gas expander turbines and their associated hot particulate removal and heat exchange equipment were found to be the most developmental, highest risk items considered in the study. It was also noted that if such equipment was developed, it could be applied to both steam-bottomed and non steam-bottomed cycles. The efficiency for an integrated gasification combined cycle using gas turbines at current firing temperatures was estimated at 37.7%. Performance at this level suggests the possibility that integrated gasification combined cycles using current gas turbines may be attractive for near-term application.

• Research Organization: General Electric Co., Schenectady, NY (USA)
• OSTI ID: 5884662
• Report Number(s): EPRI-AF-1160
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
01 COAL, LIGNITE, AND PEAT
COAL GASIFICATION
COMBINED-CYCLE POWER PLANTS
COMPARATIVE EVALUATIONS
BOTTOMING CYCLES
DESIGN
ECONOMICS
ENGINEERING
EQUIPMENT
FLOWSHEETS
GAS TURBINES
HEAT EXCHANGERS
HOT GAS CLEANUP
STEAM TURBINES
TEXACO GASIFICATION PROCESS
THERMAL EFFICIENCY
TOPPING CYCLES
WATER REQUIREMENTS
DIAGRAMS
EFFICIENCY
GASIFICATION
POWER PLANTS
PURIFICATION
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC CYCLES
TURBINES
TURBOMACHINERY
200102* - Fossil-Fueled Power Plants- Power Cycles
010404 - Coal
Lignite
& Peat- Gasification