Patent ID: 7083658

Claim:
A gasifler for producing a gas product from a carbonaceous fuel comprising: a first chemical process loop including an exothermic oxidizer reactor having a CaS inlet, a hot air inlet and a CaSO 4 /waste gas outlet and an endothermic reducer reactor having a CaSO 4 inlet in fluid communication with the oxidizer reactor CaSO 4 /waste gas outlet, a CaS/syngas outlet in fluid communication with the oxidizer reactor CaS inlet, and a materials inlet adapted for receiving the carbonaceous fuel; and a second chemical process loop including: a water-gas shift reactor having a syngas inlet in fluid communication with the reducer reactor CaS/syngas outlet, a CaO inlet, a steam inlet adapted for receiving gaseous H 2 O, and a CaCO 3 outlet and a calciner having a CaCO 3 inlet in fluid communication with the shift reactor CaCO 3 outlet and a CaO outlet in fluid communication with the shift reactor CaO inlet; wherein CaS is oxidized in air in the oxidizer reactor to form hot CaSO 4 which is discharged to the reducer reactor, hot CaSO 4 and carbonaceous fuel received in the reducer reactor undergo an endothermic reaction utilizing the heat content of the CaSO 4 , the carbonaceous fuel stripping the oxygen from the CaSO 4 to form GaS and the syngas, the GaS being discharged to the oxidizer reactor, and the syngas being discharged to the shift reactor, the CO of the syngas reacting with the gaseous H 2 O to produce H 2 and CO 2 , the CO 2 being captured by the CaO to form hot CaCO 3 in an exothermic reaction, the hot CaCO 3 being discharged to the calciner, the heat content of the CaCO 3 being used to strip the CO 2 from the CaO in an endothermic reaction in the calciner, and the CaO being discharged from the calciner to the shift reactor.