Coal gasification cycle

Integrated Coal Gasification Cycle with an Air Separation Unit... 

FIGURE 11.5 Basic coal gasification cycle (CGC) flow sheet arrangement air-blown configuration. (Courtesy of Klosek, P. et al.)... 

Antill, J.E., M.J. Bennett, R.EA. Carney, G. Deamaley, F.H. Fern, P.D. Goode, B.L. Myatt, J.F. Turner and J.B. Warburton, 1976, Corros. Sci, 16, 729. Bendick, W., J. Lindeman and W. Schendler, 1990, Development of a new high-temperature alloy for coal gasification, cycle processes and waste incineration, in High-temperature Materials for Power Engineering, Vol. 1, eds E. Bachelet, R. Brunetaud and D. Coutsouradis (Kluwer Academic Publishers, Dordrecht). 

Coal Gasification Combined Cycle Power Generation... 

Fig. 1. Schematic of coal gasification combined cycle power generation.

Table 1. Coal Gasification Combined Cycle Projects...

One advantage of modem coal gasification combined cycle systems is excellent environmental performance. Not only are regulatory standards met, but emissions and effluents are well below accepted levels (13,16,28). 

Whereas near-term appHcation of coal gasification is expected to be in the production of electricity through combined cycle power generation systems, longer term appHcations show considerable potential for producing chemicals from coal using syngas chemistry (45). Products could include ammonia, methanol, synthetic natural gas, and conventional transportation fuels. 

Natural gas requires no fuel treatment however, low-Btu gas, espeeially if derived from various coal gasification processes, requires various types of cleaners for use in a gas turbine. These cycles can get very complex as indicated by a typical system, which utilizes a steam bottoming cycle to achieve high efficiency. Vaporized fuel oil gas is already cleansed of its impurities in the vaporization process. 

Because fuel costs are high, the search is on for processes with higher thermal efficiency and for ways to improve efficiencies of existing processes. One process being emphasized for its high efficiency is the gas turbine combined cycle. The gas turbine exhaust heat makes steam in a waste heat boiler. The steam drives turbines, often used as lielper turbines. References 1, 2, and 3 treat this subject and mention alternate equipment hookups, some in conjunction with coal gasification plants. 

The integrated coal gasification combined cycle plant (IGCC)... 

Component Failure and Repair Data tor Gasification-Combined-Cycle Power Generation Units Power Failure rates and averages restore times from published, analytical, and judgment data Data for 121 system/component groups from Coal Gasification Combined-Cycle Units 108. 

This report presents a set of failure rate and time-to-restore data for typical components of a coal gasification combined cycle power generation unit. The data was used to examine the reliability and availability of a generic power generation unit using risk analysis models. 

Integrated coal gasification fuel cell combined cycle. 

U.S. Department of Energy and Wabash River Coal Gasification Project Joint Venture, The Wabash River Coal Gasification Repowering Project—A 262 MWe Commercial Scale Integrated Gasification Combined Cycle Power Plant (An Update) Topical Report Number 20, September 2000. 

APAC A coal gasification combined cycle process that produces fuel gases, acetylene, and electricity. Limestone is added, which produces calcium carbide, in turn used to generate acetylene by reaction with water. Operated at the Acme power plant, Sheridan, WY. 

CGCC [Coal Gasification, Combined Cycle] A general name for processes that both gasify coal and produce electricity. One such process has been operated by Louisiana Gasification Technology, at Plaquemine, LA, since 1987. See also APAC. 

COMBISULF A process for removing sulfur compounds from the gases from combined-cycle power plants with integrated coal gasification. Carbonyl sulfide is removed by catalytic hydrolysis hydrogen sulfide is removed by selective absorbtion in aqueous MEDA and the sulfur is recovered from both processes by a modified Claus unit. Developed by Krupp Koppers and first operated in Spain in 1996. See PRENFLO. 

Hitachi Coal Energy Application for Gas, Liquid, and Electricity (EAGLE) Coal MHV IGCC, Integrated Coal Gasification Fuel Cell (IGFC) combined cycle 150 360 Oxygen or air 450... 

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