Swirling gas

In the present study, the pyrolysis of a waste polystyrene plastic (PSP) has beat investigated in a swirling fluidized-bed reactor to develop an effective reactor. Effects of the reaction time, temperature, ratio of the swirling gas and the gas velocity on the yields of an oil and a styrene monomer have been discussed. 

The principle of separation of wet and dry particles is applied in the design of a spin-flash dryer for sticky and pastelike materials (Figure 33.7). In the bottom of a cylindrical chamber a high-speed impeller disintegrates the wet feed in a rapid stream of the tangentially introduced heated gas stream. The swirling gas carries away dry particles, which are then separated in a cyclone. Partially dried particles fall back into the impeller zone and are disintegrated. This type of dryer is especially suitable for thick pastes as it can handle them without dilution. 

To optimize the bubble-vortex apparatus conducted experimental studies. The experiments were performed by a single method [1] of comparative tests on dust collectors bubble-vortex apparatus with a cylindrical chamber 0.6 m and a diameter of 0.2 and 0.4 m bubble-vortex machine with adjustable blades in accordance with Fig. 1 comprises a cylindrical chamber 1 inlet pipe 2. The cylindrical chamber 1 is three swirl gas flow, which is a four blades, curved sinusoidal curve. Adjusting the blades 2 is done by turning the eccentrics, sealed with a cylindrical chamber 1 through the spring washers and lock nuts. [2]... 

Fig. 18.14 Comparison of different process configurations left) pressure-swirl-gas atomization (PSGA) (right) fi-ee-fall atomization (FFA), arrows indicating gas (G) flow directions...

For composite-particle production in a spray process, a hybrid gas atomization nozzle configuration ideally fits the requirement of gas/particle/liquid dispersion and mixing in the spray flow field. A typical pressure-swirl-gas atomization (PSGA) configuration for composite-particle production is sketched in Fig. 18.51 (upper), where solid particles, continuously supplied by a particle pump and conveyed by the atomization gas, are co-injected and impacted with the liquid droplets in the secondary atomization zone. Figure 18.51 (lower) shows... 

Fig. 18.51 (Upper) Illustration of generation of composite particles by pressure-swirl-gas atomization (PSGA) (lower) composite particles Sn-matrix-l-SiC particulates [4]...

Fig. 22.17 Illustration of the developed gas distributor for a LamRot with D = 100 mm. Two separate gas flows operate for the particle deflection and the swirl gas flow for the reduction of the span value. In (a), a technical illustration is given in [ 11 ]. The deflection air stream is redirected by baffles from a tangential inlet into axial direction. The LamRot is installed in the center of a swirl chamber. The swirl flow enters the swirl chamber tangentially as shown in (b). The streamlines indicate flow profile around the LamRot...

In Table 22.1, the performance of the two gas distributors is compared. The adaption of the swirl gas flow reduces the gas-Weber number on all three stages. 

Regions 1 and 2 have the swirling gas flowing downward at a volumetric flow rate of Q,<, and Qfz), respectively, where is the total volumetric gas flow rate entering the cyclone. In Dietz s model, Qfz) is related to by... 

Shakutsui H, Watanabe K, Onaii H, Saga T, Kadowaki H (2000) A311 flow patterns in swirl gas-liquid two-phase flow in a vertical pipe (Phase separation), Proc. of 4th JSME-KSME Thermal Engineering Conference, October 1-6, Kobe, Japan, vol. 3, pp 69-72... 

We now look at the motion of a solid or liquid particle in a fluid, starting with a general discussion and focusing on the particle motion in swirling gas flows toward the end of the section. 

As mentioned in Chap. 1, cyclones work as a result of the centrifugal forces acting on the particles suspended in the swirling gas stream. This causes the particles, which are denser than the gas, to move outward to the cyclone wall, along which they are transported downward to the dust exit. The cleaned gas leaves near the centerline, in a reverse-flow cyclone through the roof. In a once-through or flow-through cyclone, the cleaned gas exits out the bottom. ... 

Cyclone inlet section. As the mist-laden gas enters the separator, the entrained liquids and solid particles are subjected to centrifugal force. The gas enters the cyclone tube at two points, designated A, and sets up a swirling motion. Solid and liquid particles are thrown outwardly and drop from the tube at point B. The swirling gas reverses direction at the vortex C and rises through the exit portion of the tube, designated D. See Fig. S-21. 

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