| 摘要 |
<p>A two-stage rotary concentrator (20) takes the gas from a first stage desorption section (36) and passes it back into a second stage concentrator section (42). A second stage desorption gas (50) is passed over rotary concentrator (20) in a second stage desorption section (52). The gas (54) from second stage desorption section (52) may then be passed for final treatment (56). The invention greatly reduces the volume of air which must be sent for final treatment (56).</p> |
