Evaluation of Ceramic Refractories for Corrosion Behavior by Molten Slag-Seed Mixture of a Coal-Fired Open-Cycle MHD System

摘要

In an investigation of the possible use of a refractory material on the water walls of a radiant boiler in a coal-fired open-cycle MHD plant, the corrosion of a wide variety of commercial refractories was studied under reducing conditions at approx. 1500 exp 0 C in a coal-ash slag/potassium seed mixture. For several refractories, the results appear promising. Compared with earlier results obtained with slag only at approx. 1500 exp 0 C, the presence of approx. 10 mass percent K sub 2 O seed in the Montana Rosebud slag did not result in increased corrosion, and may actually have improved the corrosion resistance of many of the refractories that were tested. Of the fused-cast materials, the chrome-spinel refractory exhibited superior corrosion resistance. The magnesia-chrome refractories have shown more resistance to corrosion than the other sintered materials that were tested. A phosphate-bonded chrome-ore ramming mix performed better than the other ramming mixes, but not as well as any of the sintered or fused-cast bricks. (ERA citation 04:056822)