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Technical Considerations – IGCC: The generation of electrical power by integrated gasification combined cycle (IGCC) presents an environmentally closed system with high energy conversion efficiency. Specifically, fugitive gases of high purity, particularly CO2 can be used for sequestration, or in this case scCO2-EGS. We design a plant with pre- combustion carbon capture as this allows the larger proportion of CO2 to be captured as well as the capture of other pollutants. The principal components of a pre-combustion carbon-capture IGCC plant comprise processes of (i) oxygen production (ii) oxy- gasification (iii) the cleaning of the resulting synthesis-gas (iii) prior to burning and power generation and (iv) with the resulting pure stream of CO2 used for scCO2-EGS. These functions are as follows: Oxygen production: The air separation unit splits the influent air stream into its principal components of oxygen and nitrogen. The separated oxygen is sent to the gasifier for the oxy-gasification of coal while nitrogen is sent to the gas turbine for reducing NOx production and lowering the combustion temperature in the turbine. We use cryogenic separation as the most mature of the available technologies to provide 4000 metric tons/day of oxygen to the gasifier and Claus plant. Oxy-gasification: Sub-bituminous powdered coal from the San Juan Basin is then gasified in a pure-oxygen environment to produce CO and H2. The gasifier significantly reduces water use over traditional air-combustion thermal methods. We optimize reactor conditions and reactant concentrations to maximize synthesis gas output. For a nominal power output of 550 MW-electricity we require two entrained flow reactors consuming 7000 metric tons/day of coal water slurry and 3500 metric tons/day of oxygen. Both reactors operating with an average cold gas efficiency ranging from 70–75% supply synthesis gas capable of 1000 MW-electricity. Synthesis gas cleaning: The output synthesis gas stream from the gasifier is of CO and H2 and is passed through a water-gas shift (WGS) reaction. The WGS reactors convert the majority of the CO to CO2 (97% conversion efficiency) in an effort to produce more hydrogen by freeing it from H2O (an added reactant in the form of steam). This is accomplished by using a series of two reactors at different temperatures to increase the conversion efficiency and the concurrent use of a sulfur resistant catalyst which also serves to hydrolyze COS to H2S. Sulfur-impregnated activated carbon removes 95% of the fugitive mercury. Hydrogen combustion: CO2 and H2S are then stripped from the synthesis gas in the two stage acid-gas removal (AGR) reactor using Selexol as a solvent for high pressure absorption followed by flash depressurization to recover acid gases. The two stage AGR separately recovers CO2, H2 and H2S. The H2 stream is 91.4% pure and is co-combusted with O2 and N2 in a GE H-Class turbine to reduce the burn-temperature and to generate electricity. For a net output of 550 MWe from the burning of H2, the IGCC produces a iiPDF Image | GREAT NECK WATER POLLUTION CONTROL DISTRICT NASSAU COUNTY, NEW YORK MICROTURBINE INSTALLATION FEASIBILITY STUDY
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