Pressurized fluidized bed combustion

Pressurized fluidized-bed combustion (PFBC) is, as the name implies, operated at above atmospheric pressures. The beds and... 

PFBC [Pressurized Fluidized-Bed Combustion] See also AFBC. 

For this system, the data base requirements are more critical since, in pressurized fluidized bed combustion, the alkali tolerance levels for downstream turbine operation are of the order of 0.02 ppm. Spacil and Luthra (3 ) compared their thermochemical predictions with observed combustion gas stream alkali concentrations. Here, Na2S04, NaCl, NaOH, and the K-analogues were included as significant molecular species in the thermochemical model data base. Albite and sanidine were assumed to represent the coal ash alkali-getter substrates. Fair, but encouraging, agreement between calculated and observed gas phase alkali concentration was obtained. 

Glass-Combustion Gas System. Certain combustion gas components can promote alkali vapor transport in glass systems. Such transport is important in glass melting. Also, glass had heen suggested as a medium for trapping particulate material in combustion gas clean-up processes, such as for pressurized fluidized bed combustion ( ). ... 

Finally, the low-sulfur char is used as a clean boiler fuel for electric power generation. The hot char can be used directly, at pressure, with obvious advantages in thermal efficiency by using a pressurized, fluidized-bed combustion system (PFBC). The size consist of the char should ensure good performance when fluidized in the PFBC. Because the char has been partially desulfurized, the flue gas can easily meet a S02 emission specification of less than 0.8 lb per 106 Btu without the need to add limestone. This is in contrast to burning the Wyodak feed coal in a... 

Pressurized fluidized-bed combustion (PFBC) of coal This is probably the most promising application field for inorganic filters, despite the fact that only a few large-scale examples of application have been successfully tested in very recent years [14]. Dust is removed just at the outlet of the boiler, allowing heat recovery from cleaned gases. 

Hydrocarbon Technologies, Inc. integrated gasification combined-cycle Kellogg-Rust-Westinghouse process molten carbonate fuel cell methanol-to-gasoline process once-through Fischer-Tropsch process phosphoric acid fuel cell pulverized coal polymer electrolyte fuel cell pressurized fluidized bed combustion 1015 Btu... 

Coal is far from being a worn-out of faded commodity and offers much promise for future energy supply (Kavalov and Peteves, 2007 Speight, 2008, 2011 Malvid, 2011). Much research has gone into improving the efficiency of coal use, especially the implementation of coal-fired plants based on clean coal technology (pressurized fluidized bed combustion). 

Replacing the process with one that does not generate or will minimize the pollutant, for example, pressurized fluidized bed combustion instead of pulverized coal burning, and Selecting a type of coal-fuel that eliminates the pollutant, for example, use of low-sulfur coal. 

Fluidized bed combustion of coal is used to reduce the emission of sulfur dioxide and NO into the enviromnent. In this technology the pulverized fuel is burnt in a fluidized bed combustor after being blended with limestone or dolomite, which act as soibents for SO2. The burning temperature is significantly lower than is common in the production of fly ashes in suspension-fired furnace chambers, at around 850°C. The process may take place at atmospheric pressure (atmospheric fluidized bed combustion, AFBC) or elevated pressure (pressurized fluidized bed combustion, PFBC). 

Additional extensive reviews of high-temperature gas cleanup by means of, among other devices, candle filters have been summarized by Di Carlo and Foscolo [51]. Smith and Ahmadi [52] review the field of hot gas filtration in relation to pressurized fluidized bed combustion (PFBC) and integrated combined cycle gasification (IGCC). 

Wolf, K.J., Muller, M Hilpert, K. and Singheiser, L. (2004) Alkali sorption in second-generation pressurized fluidized-bed combustion. Energy Fuels, 18, 1841-1850. 

Walter E, Krartz HT, Almhen P. Lignite fired combined cycle heat and power plant using pressurized fluidized bed combustion. Proceedings of the 14th International Conference on Fluidized Bed Combustion, ASME, 1997, pp 359-369. 

Mann M, Swanson M, Yagla S. Characterization of alkali and sulfur sorbents for pressurized fluidized bed combustion. Proc 13 FBC Conf, Orlando, FL, USA, 1995, pp 333-340. 

Pressurized fluidized bed combustion Wet ash removal Ship loading Long-distance pipelines... 

Advanced Hot Gas Cleanup Systems. Advanced hot gas cleanup systems must achieve effective final particulate removal without cooling the gas. Extensive development of the technology is under way for advanced coal gasification and pressurized fluidized-bed combustion (PFBC) applications. However, per unit of coal, hot gas final particulate removal for coal gasification has only one-fifth the gas flow of PFBC. This fact is significant because the gas flow rate determines the size and cost of advanced hot gas particulate removal devices. 

Pulverized coal with no sulfur control Pulverized coal with flue gas desulfurization Atmospheric fluidized-bed combustion Pressurized fluidized-bed combustion Integrated gasification combined q cle (IGCC) Advanced IGCC... 

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