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Inaddition to naturai-gas-fired systems, SOFCo is also currently developing compact, multi-kW fuel cell generators that operate on liquid fuel oil (diesel, JP-8, for example). In conjunction with the U.S. Defense Advance Research Projects Agency and the U.S. Army, SOFCo has recently achieved a first-of-a-kind demonstration of a planar SOFC stack operating on JP-8 logistic fuel. A partial oxidation fuel processor operating at 1 bar was used to convert the liquid fuel to a hydrogen-rich gas. The small size and fuel flexibility of systems based on this technology enable a wide range of mobile and remote power system applications and represent a significant advance in SOFC system technology-

Liquid fuel processing was demonstrated through partial oxidation of the sulfur-laden (500 ppm by weight) military logistic fuel at temperatures exceeding 1100°C, steam-to-carbon ratios of about 1.6, and fuel equivalence ratios of approximately 2.6 (actual fuel-to-air ratio divided by the stoichiometric fuel-to-air ratio). Figure 4 shows the JP-8 fuel conversion efficiency during the 100-hour test of the unit (higher heating value of CO + Hj + CH4 products divided by the higher heating value of the feed stock). Extensive work was performed to characterize the product gas composition under a variety of operating conditions. Hydrocarbon speciation, sulfur analysis, and soot formation were considered. Operating conditions were chosen to maximize net system efficiency.

Recent demonstrations of liquid-fueled systems were carried out in a new SOFC system test facility designed and built at the Babcock & Wilcox Research and Development Division's Alliance (Ohio) Research Center. The facility is capable of testing systems using liquid fuels (diesel, JP-8, gasoline), hydrogen, and other bottle gases. Figure 5 shows a schematic of the test facility: A combination of automatic and manual controls

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