Showing papers by "Saurin Majumdar published in 1987"
10 Aug 1987
TL;DR: In this article, the feasibility of the MSOFC concept has been proven, fabrication processes have advanced to the point of production of near defect-free fuel cell stacks, and electrode characteristics have been significantly improved to enhance MSOC performance.
Abstract: Recent work on the MSOFC (Monolithic Solid Oxide Fuel Cell) has resulted in the following accomplishments: (1) the feasibility of the MSOFC concept has been proven, (2) the fabrication processes have advanced to the point of production of near defect-free fuel cell stacks, (3) the electrode characteristics have been significantly improved to enhance MSOFC performance, (4) single-cell performance has been demonstrated at very high current densities, and (5) multi-cell stack performance has improved significantly in terms of both higher open-circuit potential and lower cell resistance. The objectives of further development are to scale up the MSOFC in terms of power level, active area, and stack height. Scale-up to significant power levels (above 1 kw) will involve development in several areas including manifolding, insulation, gas handling and control, electrical contacts, and power control.
3 citations
01 Oct 1987
TL;DR: In this paper, a self-pumped limiter was designed as the impurity control system for the TPSS high-..beta.. power reactor conceptual design, which removes helium by trapping impinging helium ions in freshly deposited vanadium surface layers in a slot region.
Abstract: A lithium cooled self-pumped limiter has been designed as the impurity control system for the TPSS high-..beta.. power reactor conceptual design. The limiter removes helium by trapping impinging helium ions in freshly deposited vanadium surface layers in a slot region. No hydrogen is removed and no pumps or vacuum penetrations are used, thereby eliminating penetration shielding and reducing tritium handling. The limiter is composed of a vanadium alloy structure with a 2mm tungsten cladding on the front face and leading edges for sputtering control. Up to approx.3cm of vanadium trapping material is deposited in the slot region during 5 years of operation. A key design feature is the use of a calcium oxide electrical insulator which coats the limiter coolant channels to reduce MHD pressure drops. A combination of high lithium coolant velocity, made possible by the insulator, and mid-limiter manifolding has been used to obtain acceptable material temperatures with moderately high heat fluxes (3 to 5 mw/m/sup 2/). Overall, a limiter lifetime of approx.5 years is predicted by stress and lifetime analysis. This would permit maintenance free impurity control operation between first wall/blanket replacement periods. 4 refs., 3 figs., 1 tab.
2 citations