Advanced gasification combustion

The Advanced Gasification Combustion (AGC) project was developed by the National Energy Technology Laboratory (NETL) and General Electric and Environmental Research Corporation (GE-EER), etc. The AGC process is considered to have three fluidized bed reactors. In reactor 1, coal is partly gasified with steam in the presence of a C02 sorbent. The remaining char together with the C02 sorbent is sent to reactor 2. In reactor 2, char is... 

Rizeq G., West ]., Frydman A., Subia R., Zamansky V. and Das K., Advanced Gasification-Combustion Technology for Production of Hydrogen Power and Sequestration-ready C02, Gasification Technologies 2003, Oct. 12-15, San Francisco, CA, 2003. 

Rizeq, G. et al., Advanced gasification-combustion technology for production of hydrogen, power and sequestration-ready COz, Presented at Gasification Technologies 2003, San Francisco, CA, October 12-15, 2003. 

The use of more efficient technologies or process changes can reduce PIC emissions. Advanced coal combustion technologies such as coal gasification and fiuidized-bed combustion are examples of cleaner processes that may lower PICs by approximately 10%. Enclosed coal crushers and grinders emit lower PM. 

Purification of H2 as an intermediate or final product is a pivotal process that cuts across the transportation fuels and chemical sectors. Over the past few decades, tremendous progress has been made in the development of selective polymeric, ceramic, metal, and composite membranes for H2 separation. Of particular interest has been development of highly permselective membrane systems to enable efficient, economic, and environmentally responsible production of power within the context of advanced gasification processes that employ combustion turbines and solid oxide fuel cells. 

Italy is also investigating options for power generation, based on new cycles and advanced technologies, including gas turbines, gasification of coal (and biomass), and high efficiency/ultra low-zero emissions combustion. 

A thermochemical conversion of a solid biofuel into a fuel gas is an additional operation prior to application, which can be justified by a more efficient and flexible use of the cleaner gas. The pollution and flue gas cleaning problems from direct combustion of dirty coal are expected to be reduced by more efficient and environmentally con atible integrated gasification combined cycle (IGCC) processes. This strategy for an advanced utilisation of fossil fuels is also suited for solid biofuels like the relatively clean wood, as it is even more suited for the dirtier cereal straw and related herbaceous bio-materials. 

Power and heat production by the process of pressurised air blown fluidised bed gasification of solid fuels is a promising technology with respect to emissions and efficiency. These process characteristics depend strongly on parameters like fuel type, pressure and air stoichiometry. There is a relation between these variables and the actual process configuration, like e.g. staged combustion, advanced PFBC IGCC, or the British Coal Cycle . 

The exhaust heat from the combustion turbine is recovered in the heat recovery steam generator to produce steam. The waste heat is passed to a steam turbine system, while heat is recovered from both the gasification process and the gas turbine exhaust in advanced boilers producing steam. The steam is then used in steam turbines to produce additional electrical power, while the syngas mixture could also feed a fuel cell plant (IGFC). 

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