Blow tank, dense-phase pneumatic

Pneumatic conveying dense phase pressure pressure, batch Cycle time 1-4 min charge 10 s convey 0.5-3 min 20-50 batches/h. nominal gas velocity horizontal 4.5-35 m/s with usual 6-10 m/s vertical 1.5-27 with usual 3 m/s. Solids loading horizontal 12-130 kg/kg air vertical 10-800 with usual 250-400 kg solids/kg air. Blow tank < 15 m. Line diameter 3-10 cm. Power 3-5.5 kJ/kg. Watch for humid air and line plugging. Pressures 0.17-0.45 MPa abs. 

Pneumatic conveying dense phase No jJow or flow < design plugged line/mal-function of line boosters because of stuck check valve/high humidity. Solids fed to conveying line < design ratio of air to fluidize in the blow tank relative to convey is too small/fault in control system. 

Dense-phase conveying, also termed "nonsuspension" conveying, is normally used to discharge particulate solids or to move materials over short distances. There are several types of equipment such as plug-phase conveyors, fluidized systems, blow tanks, and, more innovative, long-distance systems. Dilute-phase, or dispersed-phase conveyors, are more versatile in use and can be considered the typical pneumatic conveying systems as described in the literature. The most accepted classification of dilute-phase conveyors comprises pressure, vacuum, combined, and closed-loop systems. 

---