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This study presents a theoretical model describing the thermal and closed loop control behaviour of uranium-bed assemblies, used for the storage of hydrogen or its isotopes. Storage is in the form of UH(3) at ambient temperature, while heating uranium-beds to 700-900 K can deliver the desorbed gas at pressures useful for transport to other process equipment. Modern compact uranium-bed assemblies include multiple-containment stainless steel vessels to provide vacuum insulation, safety boundaries and to accommodate the heating and cooling systems. The thermal model describes the heat balance and the time evolution of the hydride powder temperature and includes radiation, dissociation and convection heat transfer processes. The process controller simulation includes PID-type control/decision and adaptive algorithms. The overall model allows for simulations of the behaviour of the closed loop system, to demonstrate its effectiveness to achieve controlled release of hydrogen gas. A numerical example is presented which is based on a typical bed assembly. The simulation methodology used can easily incorporate more complex geometries, additional process components such as control valves, pumps and reservoirs as well as advanced control strategies as a means of predicting gas flow/pressure characteristics and bed safety.

Additional information

Authors: KONSTANTELLOS A, JET Joint Undertaking, Abingdon, Oxon. (GB);KARDITSAS P J, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(92)83 EN (1992) 27 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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