In this work, the gas−solid flow and water vaporization process are simulated by the method of Euler−Eulerian two-fluid model in a three-dimensional spouted bed, which have a significant influence on the desulfurization efficiency. The results of simulation indicate that the change trends of the particle volume fraction are similar under superficial gas velocities of 0.7 and 0.8 m/s. The degree of particle pulsation is the highest at the bottom of the spout area, and the degree of gas pulsation is the highest at the junction of the annulus area and spout area. The temperatures of gas, liquid, and particles are also analyzed. The results demonstrate that in the spout area, the gas temperature is much higher than that of the liquid and particles, but the three phases are uniformly mixed and have similar temperatures in other areas. Moreover, water vaporization mainly occurs at the junction of the annulus area and the spout area, a small amount of liquid is vaporized at the center of the spout area, and basically no vaporization reaction occurs in the outer radius of the annulus area. With the increase in gas velocity, gas temperature, and liquid temperature and the decrease in gas humidity, water vaporization reaction is promoted.
The hydrodynamics of the gas–solid
two-phase flow and vaporization
of the water phase in an integral multijet spout-fluidized bed (IMJSFB)
and spouted beds with spherical longitudinal vortex generators (LVGs)
and an integral swirling blade nozzle (ISBN) was numerically simulated.
These three novel strengthening components are adopted for the strengthening
of the radial mixing of particles, promoting the uniformity of the
flow field velocity distribution, and increasing the water vaporization
rate. The simulation results show that the three novel strengthening
components can promote the uniformity of fluid flow velocity distribution
in beds, and the promotion effect is arranged in descending order
as follows: LVGs > swirling blades > multijet. In the case of
water
vaporization, the LVGs, swirling blade, and multijet mainly promote
the vaporization of water near the generators, in the spout zone,
and the zone near the side nozzles, respectively. Among them, the
swirling blade contributes the most to water vaporization, followed
by the multijet and then LVGs. In addition, when the gas inlet velocity
and temperature are 11.2 m/s and 520 K, respectively, water vaporization
is most obviously boosted.
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