Gas: heating and illuminating – Processes – Fuel mixtures
Reexamination Certificate
2011-04-26
2011-04-26
Neckel, Alexa D (Department: 1723)
Gas: heating and illuminating
Processes
Fuel mixtures
C048S061000, C423S644000, C423S648100, C423S650000, C423S651000
Reexamination Certificate
active
07931712
ABSTRACT:
The present invention is a natural gas steam reforming method for generating an output gas mixture of carbon dioxide and hydrogen, including the following steps. (1) Combusting a portion of the natural gas with an oxidizing agent to generate heat, superheated steam, and a gas mixture of carbon dioxide, carbon monoxide, and hydrogen. (2) Steam reforming the gas mixture with additional superheated steam under steam-rich conditions to transform a remaining portion of the natural gas into carbon dioxide, carbon monoxide, and hydrogen. (3) Water-gas-shifting any residual carbon monoxide into additional carbon dioxide and additional hydrogen by utilizing a water-gas-shift catalyst downstream of the steam reforming step, thereby producing an effluent gas mixture that is predominantly carbon dioxide and hydrogen. (4) Boiling water in a top-to-bottom linear countercurrent heat exchanger to generate the superheated steam by transferring heat released in the water-gas-shifting step, where as the water is gravitationally and thermally stratified from top to bottom with a top portion boiling into steam, the steam continues to rise and is additionally heated in the top-to-bottom linear countercurrent heat exchanger. (5) And, utilizing the superheated steam produced as a reactant in the steam reforming step and the water-gas-shifting step to assist in reformation of the natural gas into carbon dioxide and hydrogen.
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Michael Sam G
Sargsyan Gevorg
Zubrin Robert M
American Patent Agency
Hussain Daniar
Merkling Matthew J
Neckel Alexa D
Pioneer Energy Inc.
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