|Trigeneration energotechnological plant|
Within the limits of alternative power activity the new type of trigeneration power plants (fig. 1) for hydrogen, thermal energy and aluminum hydroxide production is developed. Operation of these plants is based on hydrothermal disperse aluminum oxidation reaction. The aluminum powders (marks ASD-4, ASD-6, produced commercially), and water are used as initial reagents. As a result of reaction aluminum with water hydrogen and nanocrystallized high purity aluminium hydroxide (boehmite) powders are formed. Hydrogen quality meet GOST (Russian State Standard) 3022-80 (category A) parameters. The average boehmite particles size is basically ~ 50–150 nanometers (depending on the sizes of aluminum particles and process parameters), with pores size from ~ 1 up to tens of nanometers that allows to classify them as nanostructured material. Boehmite can be used for manufacturing of sorbents, additives in cosmetics, etc., and also can be transformed in nanostructure aluminum oxide which application area is even wider (fig. 2). It needs boehmite heating up to 700–750 С γ-Al2O3 is formed, at 1200–1300 С α-Al2O3 is formed.
Trigeneration energotechnologocal plant can be used at the factories, whose activity is directly connected with boehmite processing (in this case the heat and the electric power received from hydrogen are by-products and are used for factory needs). The plant can be used for hydrogen supply in different technological processes, hydrogen refuellings in regions where there are no capacities for hydrogen manufacturing by other ways, for electric and thermal energy supply of remote consumers (at comprehensible expenses for delivery of initial raw materials), and also (in a variant of uninterruptible power supply)—for maintenance of uninterruptible power supply of objects. The basic advantage of the last variant before other ways of supplying by hydrogen of high-power electrochemical generators is large hydrogen volumes transportation and storage issues absence. All hydrogen is made and consumed in place. Lower cost of received hydrogen in comparison with other methods (electrolysis, hydrocarbons reforming) is reached by means of the reaction by-product realization—nanocrystallized boehmite.
In case of wide energotechnologocal plant usage the infrastructure for fuel delivery and the reaction products gathering (with their the subsequent recuperation, or realization) should be created. Corundum manufacturing can also be created as a part of this infrastructure.