Gasification combined-cycle plant configuration studies. Final report

Technical Report · Sun Jun 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/5353557· OSTI ID:5353557

Foster-Pegg, R. W.; Garland, R. V.

This report presents the results of a Texaco based coal gasification combined cycle configuration study in which current technology combustion turbines are applied with the ultimate objectives being: (1) determine a plant configuration that yields high efficiency; and (2) determine and quantify the influence of plant configuration and plant operating conditions on performance. Best efficiency, about 39% based on coal HHV (8840 Btu/kWh), is attained by integrating the gasification and gas cleanup system with the combined cycle. A reheat steam turbine operating at highest steam conditions practicable is also required along with a hot fuel gas expander which operates at 1000/sup 0/F inlet temperature. The cycle can be simplified considerably by reducing the steam temperature to 950/sup 0/F and deleting the fuel gas expander. These actions result in a heat rate increase of only about 2%. Further simplification is achieved by replacing the reheat steam turbine with a non-reheat machine which in turn simplifies the heat recovery steam generator configuration. The end result is an increase in heat rate of about 8% over the most efficient configuration, but the resultant heat rate is still lower than that expected for conventional coal fired power plants. One of the most challenging developmental efforts required to achieve a plant configuration that will operate at the highest efficiency relates to the integration of the gasification system with the combined cycle. A raw gas cooler is required which must operate in a hostile atmosphere at temperatures in the 1400/sup 0/F to 2400/sup 0/F range and must superheat and reheat steam to 1000/sup 0/F. The difference in overall plant performance using a simple design gas cooler versus a complicated one amounts to a portion of the 2% increase in heat rate mentioned above.

• Research Organization: Westinghouse Electric Corp., Concordville, PA (USA)
• OSTI ID: 5353557
• Report Number(s): EPRI-AP-1393
• 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
COAL GASIFICATION
COMBINED-CYCLE POWER PLANTS
DATA
DATA FORMS
DESIGN
EFFICIENCY
ENGINEERING
GASIFICATION
GRAPHS
INFORMATION
NUMERICAL DATA
POWER PLANTS
TABLES
TEXACO GASIFICATION PROCESS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES