scholarly journals Utilization of Coal-Derived Fuel in Advanced Power Generation Systems: An Evaluation

1982 ◽  
Author(s):  
R. D. Lessard ◽  
F. L. Robson ◽  
W. A. Blecher ◽  
A. W. Carlson
Keyword(s):  
Power Generation ◽  
Coal Gasification ◽  
Combined Cycle ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Study Program ◽  
Fuel Gas ◽  
Power Generation Systems ◽  
Power Costs ◽  
Carbonate Fuel Cell

This paper highlights a recently completed study program to evaluate the performance and cost of advanced power generation systems which utilize coal-derived, medium-Btu fuel gas. Three advanced power generation systems are covered: combined-cycle gas turbine, molten carbonate fuel cell, and open-cycle MHD/steam. Two coal gasification processes for supplying the medium-Btu fuel gas are considered; they are the oxygen-blown Texaco process and British Gas Corporation/Lurgi process or simply BGC process. Descriptions of the advanced power generation systems and of the medium-Btu fuel gas supplied by the gasification processes are provided. The performance of each of the advanced power generation systems is evaluated when utilizing coal-derived, medium-Btu fuel gas supplied 1) via pipeline from each of the two coal gasifiers, and 2) through integration with each of the two coal gasifiers. Estimates of electric power costs are given.

Efficiency Analyses of a Coal Gasification Molten Carbonate Fuel Cell With a Gas Turbine Combined Cycle Including CO2 Recovery

2008 ◽  
Author(s):  
F. Yoshiba ◽  
E. Koda
Keyword(s):  
Fuel Cell ◽  
Gas Turbine ◽  
Coal Gasification ◽  
Combined Cycle ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Coal Gas ◽  
Co2 Recovery ◽  
And Storage ◽  
Carbonate Fuel Cell

The efficiency of an integrated coal gasification system equipped with a molten carbonate fuel cell, a gas turbine and a steam turbine (IG/MCFC) is calculated. Coal is conveyed to a gasifier furnace by CO2 and changed to coal gas by adding oxygen; a methyldiethanolamine (MDEA) method is applied to initiate a cleanup procedure of the coal gas. A water-gas shift converter is employed to heat up the coal gas. The cathode gas of the MCFC is composed of CO2 and O2 with a composition of 66.7/33.3 (noble cathode gas composition). The magnitude of the system’s electrical power output is assumed to be that of a 300 MW class. The calculated net efficiency of the 2.2 MPa pressurised system reached a 60.1% high heating value (HHV) without CO2 recovery. The 2.2 MPa pressurised system, however, has a short lifetime limited by the shortening of electrodes. For this reason, a further 0.15 MPa pressurised system (low pressurised system) efficiency is recorded which has a more promising shortening time of the electrodes. The net efficiency of the low pressurised system is 51.9% HHV without CO2recovery. Since the coal is gasified using oxygen and the cathode gas of the MCFC is composed of CO2/O2, the system’s exhaust gas only includes CO2, thus the system is ready for the recovery and storage of carbon dioxide (Carbon Capture and Storage ready, CCS ready). For the purpose of estimating the net efficiency with CO2 recovery, a liquid form of CO2 with a pressure of 10MPa is assumed. Using the 2.2 MPa pressurised system, the net efficiency including the consumption of CO2 compression and liquefaction is evaluated at 58.2% HHV. Another simple CO2 closed system configuration without gas turbine is proposed; the net efficiencies of the 2.2 MPa and the 0.15 MPa system including the consumption of CO2 liquefaction are determined at 56.4% and 50.3% HHV, respectively. According to the calculation results, a high efficiency system with CO2 recovery is possible by applying the noble cathode gas in the IG/MCFC systems.

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