NEXT GENERATION CARBON-FUELED HYBRID COMBINED CYCLE POWER PLANT CONCEPT

摘要

Any future coal-fired power plant will, out of necessity, require a very high thermal efficiency (i.e., low heat rate), near-zero criteria pollutant emissions, zero net water consumption, and a competitive levelized cost of energy (LCOE). No such clean coal power plant technology is currently available for commercial implementation. It should be noted that in order to meet existing and future regulatory requirements the additional capital costs of meeting current and future pollution emissions reduction mandates will end up costing more than the initial investment for the basic coal-fired power plant infrastructure. Coal-fired power plants are evolving quickly in response to these increasingly stringent environmental regulations. The integration of several commercial and developing technologies has the potential to meet all the regulatory and performance criteria required for a future coal plant. These technologies would include flameless pressurized oxy-fuel combustors (POXC); an advanced (700oC) ultra-supercritical (A-USC) Benson boiler with horizontal furnace; an adiabatic liquefied air energy storage system (aLAES); waste heat recovery utilizing the liquid air components (LOx, LN2) including captured and liquefied combustion exhaust carbon dioxide (LCO2) as energy recovery ‘heat sinks’; coal beneficiation and pulverization with biocoal co- firing; and complete stack gas moisture recovery with capture and disposal of any remaining pollutant emissions. Life-cycle costs are expected to be comparable to a traditional USC boiler with an air separation unit (ASU), and full pollution emissions abatement systems including a partial CO2 capture and sequestration (CCS) system.