Combined cycle power generation

Coal Gasification Combined Cycle Power Generation... 

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

Fig. 3. Combined cycle power generation using SCGP.

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. 

Ahner, D. J., May, T. S., and Sheldon, R. C., Low BTU Gasification Combined-Cycle Power Generation, Presented at Joint Power Generation Conference, Miami Beach, September 15-19, 1974. 

Young. J.B. (1998). Computer-based project on combined-cycle power generation, Cambridge University Internal Report. 

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. 

Significant effort is underway in the United States to develop and commercialize coal gasification processes for producing gaseous fuels One of the major obstacles in the development of such a process is the presence of undesirable contaminants in the product gas stream. The major contaminant in coal gasification is hydrogen sulfide (H2S), which is toxic, poisonous to downstream catalysts and extremely corrosive in nature. Control of H2S in the fuel gas to a safe level is therefore essential. The H2S removal requirements are even more critical when the fuel gas is used in combined cycle power generation or in fuel cells. 

Figure 1. A schematic of an integrated coal gasification system for fuel cell or combined-cycle-power-generation applications.

Heavy residue gasification and combined cycle power generation a process for producing hydrogen from residua. 

Today, Low-Btu Gas (LBG) is expected to be preferred in small demand applications for single users located outside of downtown metropolitan areas. Specific industries in which LBG is expected to be most competitive include primary metals, iron ore beneficia-tion, metal finishing, lime brick refractory, and food industries. Another potential market for Low-Btu Gas is in combined cycle power generation. Cleaned Low-Btu Gas may be particularly advantageous when a plant has many separate combustors which, because of the anticipated new environmental standards, would require either multiple scrubbers or a flue gas collection system. Cleaned Low-Btu Gas is also one of the few options available to a user planning a plant expansion in a non-attainment area. 

In contrast, gasification systems are far more efficient, reaching 60 percent, versus only 20-40 percent for some direct-fired plants.31 These types of systems heat the biomass in an environment where the solid biomass breaks down into a flammable gas, such as methane.This gas can then be used in more efficient combined-cycle power-generation systems... 

Another gasification alternative under consideration is the use of entrained-bed gasification with Texas lignite, such as the Shell or Texaco processes (36). Such a gasifier could be used to produce synthesis gas or be used in conjunction with a combined-cycle power generation facility. A recent EPRI report prepared by Fluor Engineers (41) presented the results of a detailed engineering and economic evaluation of such a power... 

Spath, P.L. and Mann, M.K. Life cycle assessment of a natural gas combined-cycle power generation system. September 2000, NREL/TP-570-27715. http //www.nrel.gov/docs/fy00osti/27715.pdf. 

Fig. 2 Efficiency of combined-cycle power generation. (View this art in color at www.dekker.com.)...

Fuel processor for 5 kW PEM fuel cell unit Combined-cycle power generation Production of low-sulfur diesel fuel Waste-fuel upgrading to acetone and isopropanol Conversion of cheese whey (solid waste) to lactic acid Ethanol for gasoline from com symp... 

JCN Newswires MHI achieves 3,000 hour operation, unprecedented in Japan Iot SOFC/MGT combined-cycle power generation systems, 2 Oct 2009... 

---