Fig. 13 Variations with (a) gas phase kinetic factor and (b) liquid
spray density of the rotational flow ratio for the gas-liquid phase in
overflow distribution.
As shown in Fig. 13b, the rotational flow ratio for the gas phase
increases slowly with increasing liquid spray density. With the
increasing liquid phase spray density, the liquid layer above the sieve
holes under all flow patterns gradually thickens, resulting in an
increase in the resistance of perforated flow for the gas phase, which
decreases the proportion of perforated flow and enlarges the proportion
of rotational flow. Therefore, the gas-phase rotational flow ratio
increases gradually. The rotational flow ratio for the liquid phase
decreases first and then increases with increasing liquid spray density.
The turning point is approximately L W = 78
m3/(m2*h) because the flux for the
sieve holes is limited. Within the load capacity, the perforated flow
for the liquid phase continuously increases, and the rotational flow
ratio decreases with increasing spray density. However, after exceeding
the capacity of the sieve hole load, the perforation fluid volume
reaches its limit, and then, the perforation liquid phase will not
increase with increasing spray density. The liquid phase can only flow
out in the form of rotational flow. Thus, the rotational flow ratio
increases slightly. For a comparison, the rotational flow ratio for the
liquid phase with the gas-phase kinetic factor F s= 0 is shown in Fig. 13b. The rotational flow ratio also decreases first
and then increases, slightly less than 0.5. The turning point occurs atL W = 52
m3/(m2*h). Therefore, under the
structural parameters of this unit, when only the liquid phase is
present, the rotational flow for the liquid phase and the perforated
flow also account for roughly half. Increasing the kinetic energy factor
of the gas phase will promote the perforation flow of the liquid phase
and make the load limit of the sieve holes lag.
3.4.2. Rotational flow ratio in spray distribution