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Table 1: Comparison of Technologies for CO2 Capture from Gasification Systems Capability Conventional Technologies - (physical solvent absorption process such as SelexolTM or Rectisol®) Air Products’ Advanced CO2 Capture System Applicable end markets (Clean Power/Syngas/H2) Produce product gas at pressure Power, syngas or H2 (with some limitations) or combinations thereof Yes Power, syngas, H2 or Poly-gen Yes Ability to produce high- purity H2 No, needs another unit operation (PSA). Needs a sink for low BTU PSA tail gas. Yes Ability to produce high- quality syngas Good; but limitation on purity from non-acid gas impurities; N2, Ar, CH4, etc., slip to product Better; non-acid gas impurities like N2, Ar, CH4 removed by PSA Availability of high- quality heat Single location-sour syngas cooling system Multiple locations - both oxy- combustion system and sour syngas cooling system Capital expense Economies of scale Carryover of contaminants to syngas Claus plant required Sulfur export form Amenable for CO2 capture Ability to retrofit for CO2 capture Significant portion of power plant scope Economic only at large scale Yes, solvent losses to product gas Yes H2S (for later processing) Yes, with design changes Yes, but may require major modifications Reduced portion of power plant scope Economic at small and large scale No, application of solid sorbent in a fixed bed No, optional H2SO4 or H2S (for later processing) Yes Yes, capture grade available without major modifications Operating expense Solvent costs and power costs (especially for refrigeration). CO2 compression power. Incremental O2 for combustion. CO2 compression power. % CO2 capture ~90% max; > 90% requires more extensive integration, unit operation, and capital and operating expense >95%PDF Image | Air Products Pressure Swing Adsorption at the National Carbon Capture Center
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