Gasification increasing efficiency

The increased efficiency in IGCC systems translates into environmental benefits because emissions per unit energy produced are lower. This includes CO, NOx, SOx, C02, and particulates. NOx and SOx emissions are inherently lower in biomass IGCC systems because biomass fuels tend to have low N and S contents to start with, and gas cleanup and conditioning in biomass gasification systems removes these impurities before the syngas is combusted in the gas turbine. The same is true for particulates. C02 emissions are effectively zero, because biomass is a renewable fuel. 

Staged gasification is a feature that can increase efficiency. It is used by E-Gas and two processes under development in Japan, CCP and Eagle. 

The increased efficiency of the combined cycle for electrical power generation results in a 50% decrease in carbon dioxide emissions compared to conventional coal power plants. As the technology is required to develop economical methods of carbon sequestration, the removal of carbon dioxide from combustion by-products to prevent its release to the atmosphere, coal gasification units could be modified to further reduce their climate change impact because a large part of the carbon dioxide generated can be separated from the syngas before combustion. 

The first commercial IGCC plant using the Shell Coal Gasification Process (SCGP) is Buggenum in the Netherlands, which was built in 1993. The plant achieves an overall efficiency of 43%, which could be increased to over 50% if using... 

Catalysts for low-temperature gasification include combinations of stable metals, such as rathenium or nickel bimetallics and stable supports, such as certain titania, zirconia, or carbon. Without catalyst the gasification is limited (Krase et al., 2000). Sodium carbonate is effective in increasing the gasification efficiency of cellulose (Minowa et al., 1997). Likewise, homogeneous, alkali catalysts have been employed for high-temperature supercritical water gasification. 

Biomass gasification (C6H1206) Heat (2) Hydrogen Syn gas (CO+H2) FT oil (4) US, Japan Increase of efficiency and yield of conversion by nuclear enerciv... 

A similar opportunity exists for the public utility industry in the potential of LBG and MBG. The reduced environmental impact of a coal gasification plant which produces a perfectly clean fuel equivalent to natural gas, compared to direct combustion of coal may allow increased use of coal in areas where increased pollutant emission is barred. As these PSD areas increase in number, the advantages of coal gasification become more apparent. The potential of more efficient combined cycle generation systems which can be used with coal-derived gases is an added factor for implementing coal gasification. 

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