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propagate to the burner surface. Thereafter, the proper level for cooking on the lava with no further
combustion will occur primarily in the pores of the changes to the hydrogen flow valve and valve ports.
burner ring. We reinstalled the rock and food grills and made a NOx
measurement at the cooking grill surface above the
Safety First!
burner and rocks. We recorded 65-90 ppm at 50% flow
Hydrogen gas testing should be done outside or in a
and 180-260 ppm at  HIGH flow.
well ventilated area. Only pure gas should be used or
stored. Remember, though hydrogen diffuses rapidly Background NOx released by the hydrogen burner
away from a source when released, it s flammable over exposes the cook to no more than 2 ppm. The eight
wider ranges of air-fuel ratios than propane. It must be hour time-weighted average set by the U.S.
Home Power #43 " October / November 1994 27
Hydrogen
Occupational Safety and Health Administration (OSHA) Possible Future Improvements and Measurements
is 25 ppm NOx. For reference purposes, our natural 1) Coating the steel base to prevent rust caused by
gas stove burner ran at mid-range with 15 25 ppm combustion water condensation at startup and  LOW
NOx at 2.5 cm. (1 inch) above the natural gas burner hydrogen flows.
flame.
2) Venting the lid to prevent the buildup of an explosive
mixture. This could occur when the gas is  on , the
Cooking Tests were conducted: Hydrogen Steaks!!
cover is closed, and ignition has not yet occurred. An
We tried steaks for our first hydrogen barbecue as
interlock could be used to prevent hydrogen from
seen in this picture.
flowing to the burner when the barbecue cover is
closed and the flame has not yet been lit.
3) Measuring the flow rate of the hydrogen gas
delivered to the burner at different valve settings.
4) Measuring the temperature of the burner surface at
different hydrogen flow valve settings.
Acknowledgements
Ultramet, for the foam tantalum and silicon carbide
tubing samples.
A&K Machine Shop, Richmond, California for
machining the burner gas distribution plate.
Access
Authors: Walt Pyle WA6DUR 510-237-7877, John
Dabritz 510-242-5366, Reynaldo Cortz 510-237-9748,
Above: Cooking Steaks on Hydrogen Gas Barbecue
and Jim Healy WH6LZ 510-236-6745
Endurance testing is needed to determine the lifetime
Diffusion Burners for Hydrogen: Fraunhofer-Gesellschaft Institute for
of the burner. Some burner ring  break-in has
Solar Energy Systems Tel: (Freiberg, Germany) 49-761-4014-0 Ext.
occurred. After several hours of operation, the sharp
164 or 210. FAX: 49-761-4014-100
edges of the gas diffusion ring have become rounded
Diffusion Ring Tubing: Ultramet, 12173 Montague Street, Pacoima,
by excessive heating. Whether this will stabilize
CA " 818-899-0236 FAX 818-890-1946
remains to be seen. Lifting the rock grill higher above
Chemical supplies (platinum powder and wire, aqua-regia): Aldrich
the burner ring will probably reduce the reflected heat
Chemical Co., 1001 W St Paul Ave, Milwaukee, WI 53233 " 800-558-
reaching the burner ring from the glowing lava.
9160
28 Home Power #43 " October / November 1994 [ Pobierz całość w formacie PDF ]

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