Abstract
With the aid of the newly developed near IR tomography the concentration profile in the cross-section of a fixed bed adsorber was measured. The measurement technique allows in contrast to the usual local intrusive measurement principles the disturbance-free measurement of the concentration field across the adsorber layer with high time and place resolution. The maximum measurement frequency of the measurement system is 20 Hz and the local resolution 1% of the adsorber cross section (50 mm dia). The zeolite 4 Å (spherical adsorbent) and water vapor (adsorptive) system was studied. A measured concentration field is illustrated. The ratio of the layer diameter/particle diameter is 11:1. The concentration profile has a minimum in the center. Consider, as here, the layer diameter as only a small multiple of the particle diameter (D/dp < 20:1) such that edge effects occur in the fixed bed. These lead to an increased mass and heat transfer and to an early breakthrough of the column near the wall. Slender adsorbers are used industrially if at high loading the large sorption heat must be drained off through the wall. The principle and operation of near infrared tomography are described.
Translated title of the contribution | Near infrared tomography for measuring concentration fields in the fixed bed |
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Original language | German |
Pages | 1418-1419 |
Number of pages | 2 |
Volume | 76 |
No. | 9 |
Specialist publication | Chemie-Ingenieur-Technik |
DOIs | |
Publication status | Published - Sep 2004 |
Externally published | Yes |