Hydrogen production technology for powering civil and industrial systems : a review
Partial use of alternative energy exemplified by hydrogen energy is expected to reduce negative impacts associated with the current dependence on fossil energy and bring net gain to regional and national economies. Hydrogen has emission levels that are far below the existing and possibly, future standards. Hydrogen energy may enhance energy security and perhaps allay concerns some concerns about global climatic change, environmental issues, energy efficiency, and infrastructure development. Since the production of hydrogen is energy-intensive, a production technique that negates this disadvantage with a high volume output within a reasonable time, is desirable.
An Overview of hydrogen production from KRW oxygen-blown gasification with carbon dioxide recovery
All the process elements are commercially available to operate coal gasification so that it can produce electricity, hydrogen, and carbon dioxide while delivering the same quantity of power as without H{sub 2} and CO{sub 2} recovery. To assess the overall impact of such a scheme, a full-energy cycle must be investigated (Figure 1). Figure 2 is a process flow diagram for a KRW oxygen-blown integrated gasification combined-cycle (IGCC) plant that produces electricity, H{sub 2}, and supercritical CO{sub 2}. This system was studied in a full-energy cycle analysis, extending from the coal mine to the final destination of the gaseous product streams [Doctor et al. 1996, 1999], on the basis of an earlier study [Gallaspy et al. 1990]. The authors report the results of updating these studies to use current turbine performance.
A systems analysis comparing conventional and hydrogen powered rail locomotives
A computer model simulating the performance of a diesel-electric locomotive over any duty cycle has been formulated. The model allows for the comparison of alternate fuels in the diesel engine mode, and the comparison of different modes of power generation, i.e., diesel electric vs electric vs fuel cell. In combination with an engine fuel consumption model, this systems analysis will compare conventional and hydrogen powered rail locomotives.