| 摘要 |
<p>An improvement in drum mixer asphalt plants comprising a combustion chamber which substantially completely surrounds an open flame projecting into the inlet end of the drum mixer and present the temperature at any point within the drum from reaching the level where it will burn asphaltic materials to produce pollutants which would otherwise be discharged into the atmosphere. At the same time, the combustion chamber will produce heated gases flowing into the drum at a sufficiently high and uniform temperature to melt the asphalt and permit entry of the asphalt and aggregate, including recycled asphalt paving materials, close to the combustion chamber.</p> |
