| 摘要 |
<p>A device to bring a gas into contact with a particulate solid bulk material, comprising a first and a second tubular, radially gas-permeable element (1, 2) having different diameters and which each define a central axis, wherein one of the elements is essentially coaxially placed in the second element, wherein the elements (1, 2) internally define a ring-shaped shaft (30) for a material (40) that is to be contacted by the gas, wherein the elements have essentially vertically oriented axes, a ventilation device (50) for compelling the gas radially through the shaft and the material, a first device (41) for addition of the material to an upper end of the shaft (30) and a second device (31-36) for output of dried material from the lower end of the shaft. Driving means (12) are provided for internal displacement of the elements (1, 2). At least one of the walls is provided with at least one screw line ramp which maintains a high porosity and a controlled feeding of the material.</p> |
