GASES

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$49,998.00
Award Year:
1986
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
3387
Agency Tracking Number:
3387
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
820 Harden Drive, Pittsburgh, PA, 15229
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
WILLIAM G. WILSON
PRINCIPAL INVESTIGATOR
() -
Business Contact:
() -
Research Institute:
n/a
Abstract
CLOSELY CONTROLLED LABORATORY RESULTS SHOW THAT CERIUM OXIDE CAN BE USED TO REDUCE THE H2S CONTENT OF FUEL GASES WITH A CO/C02 RATIO OF 5.1 FROM 10,000 PPM TO 3 TO 6 PPM AT 1601/2873F (872/1022C). THE SULFUR CONTAINING CERIUM COMPOUND WAS REGENERATED SO THAT IT WAS CAPABLE OF AGAIN REACTING WITH THE H2S. IT IS THE OBJECTIVE OF THIS PROPOSALTO DEMONSTRATE THE EXTENT OF DESULFURIZATION WITH CERIUM OXIDE OVER A RANGE 1472/2192F (800/1200C) AND CO/C02 RATIOS OF TWO TO SIX, AND TO DESULFURIZE AND REGENERATE BACK TO CERIUM OXIDE A NUMBER OF TIMES. PRESENTLY AVAILABLE TECHNOLOGY FOR DESULFURIZATION OF FUEL GASES WITH OXIDES OF IRON, ZINC, COBALT, ETC. IS LIMITED TO FUEL GASES WITH CO/C02 RATIOS THAT SELDOM EXCEED 1.0 AT TEMPERATURES THAT ARE GENERALLY LESS THAT 1200 (649 ). IT HAS BEEN CALCULATED THAT FUEL GASES PRODUCED IN AN AIR BLOWNGASIFIER AT 1200F A CO/C02 OF ONE AND A CALORIFIC VALUE OF 110 BTU/SCF. IF AN AIR BLOWN GASIFIER IS OPERATED AT 1760F (927C), THE CO/C02 RATIO OF THE FUEL GAS MAY BE AS HIGH AS EIGHT AND THE CALORIFIC VALUE HAS BEEN CALCULATED TOBE 150 BTU/SCF-A 36% INCREASE IN BTU VALUE COMPARED TO THAT OBTAINED BY LOW TEMPERATURE GASIFIER OPERATION. THIS INCREASE IN BTU VALUE OF THE FUEL GAS DUE TO HIGHER TEMPERATURE GASIFIER OPERATION, AND DESULFURIZATION WITH CERIUM OXIDE AT A HIGHER TEMPERATURE, WHICH WOULD INCREASE THE SENSIBLE HEAT IN THE FUEL GAS, SHOULD INCREASE THE OVERALL THERMAL EFFICIENCY OF ANY PROCESS USING FUEL GASES. THE DESULFURIZATION STEP IS A NON-CATALYTIC REACTION BETWEEN THE GAS AND THE SOLID, NON-STOICHIOMETRIC REACTANT: 2CEO(2-X) (S)+H2S(G)+1-2X)H2(G)= CE202S(S)+2(1-X)H20(G). REGENERATION CAN BE SIMPLY REPRESENTED BY THE FOLLOWING: CE202S(S)+202(G)=CE02(S)+S02(G) ALL OF THE CERIUM COMPOUNDS HAVE MELTING POINTS IN EXCESS OF 3000F (1649), AND THEIR CHEMICAL STABILITY IS SUCH THEY CAN NOT BE REDUCED BY FUEL GASES. THE CONCENTRATION OF S02 GIVEN OFF DURING REGENERATION IS HIGH ENOUGH TO BE SUITABLE AS A FEED FOR A CLAUS PLANT. THE RESULTS FROM PHASE I WILL DEFINE THE SULFUR CAPTURE EFFICIENCY OF CERIUM OXIDE OVER A WIDE RANGE OF GAS COMPOSITIONS AND TEMPERATURES, AND CONFIRM THE VALIDITY OF THE PREDICTED REGENERATION PROCESS FOR THE SULFUR-CONTAINING COMPOUNDS BACK TO CERIUM OXIDE. PHASE II WILL PROVIDE THE NECESSARY KINETIC DATA FOR THE DESIGN, CONSTRUCTION AND OPERATING OF A PHASE II PILOT PLANT AND THEEVENTUAL CONSTRUCTION OF A COMMERCIAL DESULFURIZATION UNIT USING THIS TECHNOLOGY. ANY ATTEMPT TO DESIGN A FACILITY USING THIS PROCESS WOULD BE INAPPROPRIATE PRIOR TO THE COMPLETION OF PHASE II. FUEL GASES PRODUCED BY COAL GASIFICATION AT HIGH TEMPERATURES AND DESULFURIZED AT HIGH TEMPERATURES, CAN BE USED WITH INCREASED THERMAL EFFICIENCY, AS A FUEL FORM COMBINED CYCLE POWER PLANTS, FUEL CELLS, AND TO AFIRE THE BOILERS OF ELECTRIC POWER GENERATING STATIONS IF THE EPA REQUIREMENTS FOR SULFUR EMISSION FROM SUCH UNITS ARE LOWERED.

* information listed above is at the time of submission.

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