Conversion of hydrocarbons to carbon dioxide and electrical power

摘要

A process for the conversion of a hydrocarbon to CO2 and electrical power is described which includes subjecting a gas mixture of a hydrocarbon feed stream and steam to an integrated reforming process including stages of steam reforming in a gas-heated reformer and secondary reforming to generate a reformed gas mixture, increasing the hydrogen content of the reformed gas mixture by subjecting it to one or more water-gas-shift stages, cooling the resulting hydrogen-enriched reformed gas and separating condensed water therefrom, passing the resulting de-watered hydrogen-enriched reformed gas to one or more stages of carbon dioxide separation to recover carbon dioxide, combusting the remaining hydrogen-containing fuel stream with an oxygen containing gas in a gas turbine to generate electrical power and passing the exhaust gas mixture from the gas turbine to a heat recovery steam generation system that feeds one or more steam turbines to generate additional electrical power.

主权项

1. A process for the conversion of a hydrocarbon to CO2 and electrical power comprising the steps of:
(i) subjecting a gas mixture comprising a hydrocarbon feed stream and steam to steam reforming by passing the mixture over a catalyst disposed in externally-heated tubes in a gas-heated reformer to form a primary reformed gas, (ii) partially combusting the primary reformed gas with a first oxygen-containing gas, and bringing the resultant partially combusted gas towards equilibrium over a secondary reforming catalyst in an autothermal reformer to form a secondary reformed gas mixture comprising hydrogen, steam and carbon oxides, (iii) passing the secondary reformed gas mixture without intermediate cooling to the gas-heated reformer to heat the tubes therein and form a partially cooled reformed gas mixture, (iv) increasing the hydrogen content of the partially cooled reformed gas mixture by subjecting it to one or more water-gas-shift stages thereby producing a hydrogen enriched reformed gas, (v) cooling the hydrogen-enriched reformed gas to below a dew point of the steam therein to condense water and separating condensed water to give a de-watered hydrogen-enriched reformed gas, (vi) passing the de-watered hydrogen-enriched reformed gas to one or more stages of carbon dioxide separation to generate a carbon dioxide stream and a hydrogen-containing fuel stream, and (vii) combusting the hydrogen-containing fuel stream with a second oxygen-containing gas in a gas turbine to generate electrical power and an exhaust gas mixture and passing the exhaust gas mixture to a heat recovery steam generation system to provide steam for one or more steam turbines and generate additional electrical power.