Page 3163 - Flipbook_SolidDesignSoutheast2020

TechnicalExclusive
24 Powder & Bulk Solids

Januar y 2019 could result since the inclined convey pipe (low rate 11%, high rate 15%). Qualitatively low impact on its own. However, the airflow

run is technically shorter in distance than
the inclined section in dense phase with
25-40% higher. Therefore, the extra airflow
the standard (14 ft and one elbow less): the pellets saw good slug formation through required to keep the material entrained was
• Net Benefit – The benefit of the shorter very little material sliding down the incline. and velocity had negative impacts in other
length is greater than the detriment of In dilute, the airflow had to be increased to areas of the system. Qualitatively, the seeds
using the incline keep material from dropping out of suspen- had great difficulty staying entrained in the
• Null Effect – The benefit of the shorter sion. Once saltation occurred, the system airstream which resulted in the higher air-
length balances out the detriment of us- had great difficulty trying to recover. The flows. The slide angle was measured at 28
ing the incline slide angle was measured at 35 degrees. degrees.
• Net Detriment – The detriment of the
incline outweighs the benefit of the Green Coffee Beans Natural Brown Sugar
shorter length The section results for the “green coffee The section results for the “natural brown
beans” showed a net detriment in both sugar” showed a net benefit in the dense
The results of the various convey runs can dense and dilute phase. The segment results phase flow. The segment losses for the
be found in Figure 3 and are summarized showed the incline pressure drop to be incline were equal to that of the horizontal
here by material. 4.5x higher than the horizontal in dense so the shorter length provided a lower over-
phase and 2-2.3x higher in dilute phase. The all pressure drop. No additional airflow was
Glass Filled Pellets airflow for dense phase increased a dra- required to convey through the inclined pipe
The section results for the “fiberglass filled matic 35-45% while the dilute phase airflow and good slug formation could be observed.
PE pellets” was null effect for both dense required only increased 3-9%. Qualitatively The slide angle was measured at 30 degrees.
phase and dilute phase. Approximately the beans could be seen sliding back down
the same pressure drop was observed in the incline in the dense phase which created Conclusions
both piping arrangement for both the high extra work for the system to overcome. The The effect of the incline in the pneumatic
and low rates. In the segment results, the slide angle was measured at 20 degrees. convey system varied by convey phase and
incline required 2-2.5x the pressure drop material. The dilute phase results showed
compared to the horizontal pipe. The dense Chia Seeds higher airflows were required to keep the
phase airflows were identical, while the The section results for the “chia seeds” material moving up the incline as compared
dilute phase runs required 11-15% more showed a net detriment in the dilute phase. to horizontal pipe ranging from as little as
airflow/velocity to keep material moving ef- The segment losses were 1.2-1.6x the equiva- 3% to as much as 45% extra air volume.
ficiently up the incline depending on rate lent horizontal lengths which was a rather For a single material, convey rate (or line

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