| 摘要 |
<p>A gas which is neutral and non-reactive relatively to a charge of carbonaceous material passing through a newly designed calcining furnace, and heated by an electric current, is circulated in countercurrent to the charge. The gas extracted from the upper zone of the furnace goes through a condenser before it is recycled at least in part. The new furnace makes possible a very important reduction in the amt. of energy consumed by existing types of calcining furnaces for carbonaceous materials, without the need for complicated preheaters for the charge. It also improves the homogeneity of the temp. of the charge and allows all the volatile materials released during the process to be utilised for other purposes.</p> |
