Systems and processes for providing hydrogen to fuel cells
A process and system for providing a hydrogen-containing gas stream to a fuel cell anode that includes providing a hydrogen-containing gas stream that includes carbon monoxide, introducing the hydrogen-containing gas stream into a pressure swing adsorption module that includes at least one carbon monoxide-selective adsorbent to produce a purified hydrogen-containing gas stream, and introducing the purified hydrogen-containing gas stream to the fuel cell anode. The pressure swing adsorption module can also include a second adsorbent and/or catalyst. Also disclosed is a fuel cell system coupled to an internal combustion engine and a fuel cell system that utilizes fuel cell waste heat for vaporizing a hydrocarbon/water mixture.
1. An electrical current generating system comprising:
a hydrogen-containing gas source comprising a reformer or partial oxidation reactor, wherein the reformer or partial oxidation reactor comprises a first burner and a second burner;
at least one adsorption module that can at least partially purify the hydrogen-containing gas, wherein the adsorption module includes at least a first adsorbent and at least one second material selected from a second adsorbent, a steam reforming catalyst, or a water gas shift reaction catalyst, the first adsorbent and the second adsorbent being chemically distinct;
at least one fuel cell defining an anode inlet that can receive the purified hydrogen-containing gas stream from the adsorption module; and
a turbocompressor that includes an expander,
wherein the first burner receives an exhaust gas from the adsorption module, the second burner receives a hydrocarbon fuel feed, and the expander receives a combustion gas from the second burner.
2. The system of claim 1 , wherein the turbocompressor includes a feed air compressor powered by the expander.
3. The system of claim 1 , further comprising a pressure swing adsorption module configured to produce an oxygen-enriched gas stream, wherein the turbocompressor further includes a vacuum pump powered by the expander and the vacuum pump cooperates with the pressure swing adsorption module configured to produce an oxygen-enriched gas stream.
4. The system of claim 2 , further comprising a blower coupled to the feed air compressor.