Compact efficient hydrogen reactor
Methods and devices and aspects thereof for generating power using PEM fuel cell power systems comprising a rotary bed (or rotatable) reactor for hydrogen generation are disclosed. Hydrogen is generated by the hydrolysis of fuels such as lithium aluminum hydride and mixtures thereof. Water required for hydrolysis may be captured from the fuel cell exhaust. Water is preferably fed to the reactor in the form of a mist generated by an atomizer. An exemplary 750 We-h, 400 We PEM fuel cell power system may be characterized by a specific energy of about 550 We-h/kg and a specific power of about 290 We/kg. Turbidity fixtures within the reactor increase turbidity of fuel pellets within the reactor and improve the energy density of the system.
1. A rotatable reactor comprising:
an outer housing;
a fuel containment insert ( 1000 ) configured to rotate within the outer housing;
a solid fuel ( 600 ) inside the reactor ( 509 ) of the fuel containment insert;
at least one liquid inlet in fluid communication with the containment insert;
at least one atomizer in fluid communication with the liquid inlet;
at least one hydrogen outlet in fluid communication with the containment insert;
wherein at least one of the containment insert and the containment insert and liquid inlet are removable from the outer housing;
wherein the reactor comprises an outer shell ( 1201 ) and an inner shell ( 1202 ) which further contains a perforated core ( 1203 ) comprising perforations ( 1204 ), said core is configured to contain the solid fuel and allow byproducts produced during hydrolysis of the solid fuel to pass through the perforations of the perforated core.
2. The reactor of claim 1 wherein the solid fuel comprises fuel pellets, and the fuel pellets are between about 4 mm and about 15 mm in diameter.
3. The reactor of claim 1 further comprising a liquid reservoir ( 506 ) in fluid communication with the liquid inlet.
4. The reactor of claim 3 wherein the liquid reservoir further comprises:
an electrical solenoid to open and close liquid flow to the liquid inlet; and,
an end cap ( 513 ) with an external portion ( 513 ′) and a plunger portion ( 513 ″) the plunger portion being driven by a spring ( 512 ) configured to pressurize the fluid reservoir.
5. The reactor of 1 further comprising a fluid pump in fluid communication with a fluid supply and the liquid inlet.
6. The reactor of claim 1 further comprising at least one turbidity fixtures ( 602 ) and stirring element ( 604 ) formed as part of or affixed to an interior surface ( 510 ) of the reactor.
7. The reactor of claim 1 wherein solid the fuel comprises lithium aluminum hydride.
8. The reactor of claim 1 wherein solid the fuel comprises an admixture of lithium aluminum hydride and an additive comprising at least one of AlCl 3 , MgCl 2 , BeCl 2 , CuCl 2 , LiCl, NaCl, and KCl.
9. The reactor of claim 8 wherein the amount of additive in the admixture is between 5 wt.-% and 30 wt.-%.