Electric power generation with heat exchanged membrane reactor
View Patent ↗This invention is directed to a heat exchanged membrane reactor for electric power generation. More specifically, the invention comprises a membrane reactor system that employs catalytic or thermal steam reforming and a water gas shift reaction on one side of the membrane, and hydrogen combustion on the other side of the membrane. Heat of combustion is exchanged through the membrane to heat the hydrocarbon fuel and provide heat for the reforming reaction. In one embodiment, the hydrogen is combusted with compressed air to power a turbine to produce electricity. A carbon dioxide product stream is produced in inherently separated form and at pressure to facilitate injection of the CO 2 into a well for the purpose of sequestering carbon from the earth's atmosphere.
1. A method for generating power using a heat exchanged hydrogen membrane reactor, comprising the steps of:
a. supplying a carbon containing feed and water and/or steam to a reformer side of the membrane reactor, said reactor having reforming and combustion zones separated by a membrane;
b. reacting the feed with the water to form hydrogen and at least carbon monoxide, said reacting being accomplished within the reforming zone and proximate to the membrane;
c. permeating a substantial portion of the hydrogen through the membrane to the combustion zone of the reactor;
d. combusting at least a portion of the permeated hydrogen, said combusting occurring at or proximate to the membrane whereby a portion of the heat from said combusting is transmitted through the membrane to the reforming zone of the reactor for use in further reacting the feed and water to further produce hydrogen.
2. The method of claim 1 wherein a portion of the carbon dioxide is recycled to the reforming zone to suppress carbon deposition.
3. The method of claim 1 wherein said reacting of the carbon containing feed and water is promoted by a catalyst.
4. The method of claim 3 wherein said catalyst comprises Ni, NiO, Rh, Pt or combination thereof.
5. The method of claim 3 wherein said catalyst is on or in said membrane.
6. The method of claim 1 wherein said feed and water and/or steam is supplied at a pressure ranging from about one bar to about 300 bars.
7. The method of claim 6 wherein said pressure range from about 5 bars to about 40 bars.
8. The method of claim 1 where said heated air and effluent is at a temperature ranging from about 700° C. to about 1400° C.