Publications

Brady, Patrick D.; Jernigan, Dann A.; Lopez Mestre, Carlos L.; Luketa, Anay L.; Nissen, Mark R.; Hightower, Marion M.

At the request of GDF Suez, a Rough Order of Magnitude (ROM) cost estimate was prepared for the design, construction, testing, and data analysis for an experimental series of large-scale (Liquefied Natural Gas) LNG spills on land and water that would result in the largest pool fires and vapor dispersion events ever conducted. Due to the expected cost of this large, multi-year program, the authors utilized Sandia's structured cost estimating methodology. This methodology insures that the efforts identified can be performed for the cost proposed at a plus or minus 30 percent confidence. The scale of the LNG spill, fire, and vapor dispersion tests proposed by GDF could produce hazard distances and testing safety issues that need to be fully explored. Based on our evaluations, Sandia can utilize much of our existing fire testing infrastructure for the large fire tests and some small dispersion tests (with some modifications) in Albuquerque, but we propose to develop a new dispersion testing site at our remote test area in Nevada because of the large hazard distances. While this might impact some testing logistics, the safety aspects warrant this approach. In addition, we have included a proposal to study cryogenic liquid spills on water and subsequent vaporization in the presence of waves. Sandia is working with DOE on applications that provide infrastructure pertinent to wave production. We present an approach to conduct repeatable wave/spill interaction testing that could utilize such infrastructure.

ASME 2012 Heat Transfer Summer Conf. Collocated with the ASME 2012 Fluids Engineering Div. Summer Meeting and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels and Minichannels, HT 2012

Brown, Alexander L.; Brady, Patrick D.

Biomass pyrolysis systems can be designed to yield significant quantities of liquid. The liquids have approximately half the heating value of transportation fuels, depending strongly on the water content in the liquids. They are acidic, and tend to change with time, becoming more viscous and higher in molecular weight. However the process required to generate them is simple, and they hold promise to be a renewable source of liquid fuel if they can be produced in a way that is cost-effective. Northern New Mexico forests are mostly characterized by small diameter (less than or equal to 10 cm) conifer trees. For mitigation of fire risk, land owners are required to periodically thin their lands. This generates significant waste product with little or no commercial value. The most widely used current practice is to accumulate and burn the cut wood, or to leave it to rot. Seeking a more effective and ecologically friendly use of the waste, a scaled experimental pyrolysis system was developed using design principles focused on the portable model. The data from this test unit and historical data are used to evaluate the break-even costs of performing pyrolysis. The char co-product is found to have a slight beneficial effect on the economics of the analysis. Labor is a significant fraction of the cost. Economies of scale are important, so the largest system that can be transported will make the most economic sense. On a price per unit energy, this model may be competitive with liquid transportation fuels and fuel oil. However pyrolysis oils will have difficulty competing with natural gas at current regional prices. Other regions may show a more positive comparison, especially in parts of the world where labor is much less expensive. Copyright © 2012 by ASME.

Brady, Patrick D.; Rigali, Mark J.

Abstract not provided.