Keywords: CHP plants, CO2 separation, carbon dioxide emissions, gasification, hydrogen fuels, IGCC, lignite, methanol, polygeneration, synthetic natural gas, SNG, low-carbon fuels, combined heat and power, decentralised CHP
Polygeneration-IGCC concepts for the production of hydrogen rich fuels based on lignite
This paper presents three IGCC-power plant concepts for central production of a hydrogen-rich fuel (methanol, hydrogen, synthetic natural gas ? SNG) from lignite. Each concept contains a CO2-separation, which produces a sequestration-ready CO2-rich stream. Thus, CO2-emissions caused by use of lignite are considerably reduced. Furthermore, the produced low-carbon fuels are converted in decentralised Combined Heat and Power Plants (CHPP). CHPP leads to high efficiencies of fuel utilisation between 54 and 62%, which exceed the efficiencies of single power generation. Regarding to the CO2-emissions of a natural gas fired CHPP, heat and power can be generated by lignite as clean as by natural gas. The specific CO2-emissions are even much lower in the case of hydrogen production. Costs for the centrally produced methanol and hydrogen are with 29 and 19 EUR/MWh(LHV) already within an economic range. Synthetic natural gas can be produced for 23 EUR/MWh(LHV).