Speech Title:Roadmap to the hydrogen based sustainable energy system
Abstract: Fossil energy utilization, particularly carbon-based fuel burning, has caused great environmental pollution. Building a sustainable energy system is one of the most critical issues to address. As an ideal energy carrier, hydrogen has attracted the attention of government, industry and research institutions. Hydrogen production in large-scale and low-cost can solve the problems of sustainability and environmental emissions. It can be produced from water by using a variety of energy sources, such as solar, nuclear and fossils, and it can be converted into useful energy forms efficiently and without detrimental environmental effects. The only by-product is water or water vapor. Extensive investigations of hydrogen production were conducted in State Key Laboratory of Multiphase Flow in Power Engineering. Focuses are mainly put on high-efficient, low-cost, and large-scale operable system. A brief introduction of possible hydrogen production methods and ways are presented including coal/bio-mass/organic wastes gasification in super-critical water and solar-driven photocatalytic water splitting. Coal gasification in supercritical water takes the advantages of the unique chemical and physical properties of supercritical water to convert organic matter in coal to H2 and CO2. N, S, P, Hg and other elements are deposited as inorganic salts to avoid pollution emission. This technology has a bright future in industrialization not only in electricity generation but also in hydrogen production and high value-added chemicals. As to the solar-driven water-splitting, the low efficiency is attributed to obstacles in energy flow and mass flow, as well as non-coupling and mismatching of energy flow and mass flow. In addition to the material optimization, the scientific and engineered design of sunlight collection, interfacial reaction, and mass transfer is of great significance. Based on these technologies, hydrogen based sustainable energy system can be achieved in the foreseeable future....View More
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