Hydrodynamic characteristics of sieve trays having large free areas without downcomers.

Abstract

The sieve tray without downcomeris extensively used in industrial chemical processes such as distillation and absorption because it is the simplest and cheapest type of gas-liquid contacting device.Further, the importance of saving energy has recently increased the need for high-capacity gas-liquid contacting devices.In the present study, following the previous work,8j9) experiments were carried out with trays having large free areas for the purpose of clarifying the behavior and characteristics of froth. Pressure drop, liquid holdup and stable operating range were studied.

Parametric Study of a Novel Basket Impeller Column

“…Loading and flooding limits also increased with hole size and open area. More recent work has confirmed these general findings and further defined the operating loading/flooding window (Takahashi et al, 1986).…”

Efficiency of dualflow trays in distillation

“…Previous studies of dualflow trays dealt mainly with their hydraulic characteristics (Mahendru and Hackl, 1979;Takahashi et al, 1986;Ravagnani et aI., 1990;Steiner and Standart, 1967;Standart and Relay, 1956). Mahendru and Hackl (1979) developed calculation procedures of optimum gas velocity, liquid hold-up, pressure drop and froth density based on their experimental data.…”

Experimental and Computational Fluid Dynamics Validation of Correlations for Dry Pressure Drop in Trays without Downcomer

“…In trays without downcomer, both the liquid and gas pass intermittently through the hole opening, causing a poorer contact between the phases, reducing the tray efficiency, and restricting its use for certain operating ranges . However, there are considerable advantages, such as low construction costs and maintenance, high operating capacity, low pressure drop, and the self‐cleaning capacity being ideal for situations where there is a strong tendency for fouling and corrosion .…”