| 摘要 |
<p>The furnace, for calcination of building materials, e.g. plaster, cement, lime, etc. incorporates between the exterior surface of refractory drum and its thermally-insulated external casing, a surrounding separation forming an annular chamber which extends up to direct proximity with combustion chamber; a similar chamber surrounds the combustion chamber between its refractory framework and the external casing.</p> |
