SMV mixer

TABLE 4 Application of Chemineer Kenics and Koch/Sulzer SMV Mixers... 

Fig. 8.4a-d Several types of static mixers a Kenics mixer b Sulzer SMV mixer c Sulzer SMX mixer and d Ross-ISC mixer from [416]... 

In these experiments, oxygen was dispersed in water in a Sulzer SMV mixer and the absorption rate monitored. Plug flow was assumed in the evaluation of the experimental data. The results prove the proportionalities... 

Streiff [528] found the following dispersion characteristic for the dispersion in the Sulzer SMV mixer of a number of low viscosity material systems (continuous phase water, dispersed phase gasoline, kerosene, toluene, cyclohexane, air) ... 

Limiting ourselves to Sulzer technology, two interesting mixer types emerge. The Sulzer Mixer Reactor (SMR) is ideal for exothermal reactions, but is, however, only applicable for viscous fluids, e.g. polymers. The Sulzer SMV mixer on the other hand can be applied for mixtures in which gas is the continuous phase. For this reason jacketed cooling is of no use because the heat transfer coefficient for a gas is rather limited. An important remark must be made on this point only gas-liquid mixtures with a G/L ratio up to 10 can be handled with the SMV mixer.14 Therefore, when dealing with the model system, solutions must be found to decrease this ratio within the reaction system. 

Considerable data is available for static mixers. With the aid of the following relations applicable to Sulzer SMV mixers, a dedicated design can be made. 

FIGURE 9.45 Sauter mean drop diameter as a function of Weber and Reynolds numbers for Sulzer SMV mixer. 

Sulzer SMV mixer orifice/baffle plate 0 pipe mixer Kenics/Chemineer mixer / Schaschllk mixer... 

Data are available for the blending characteristics of the Sulzer SMV mixer, see Figure 12.10. As with the laminar data for the SMX and SMXL types the data are presented as the relationship between variation coefficient ([Pg.244]

The SMV mixer developed by the Swiss company Sulzer is made up of stacked corrugated plates with adjacent plates having opposite orientation. The length of one element is about one diameter usually several elements are placed in series with one element turned 90° relative to the element next to it. Because of the splitting and reorientation within one element, the mixing action is quite efficient. The mixer geometry and mixing action is shown in Fig. 7.139. This mixer is primarily used for low-viscosity fluids. 

Rotational flow exchange between crossing laminar streams in a SMV mixer... 

The Froude number wiU be evaluated to determine the suitability of horizontal flow. The pressure drop will then be calculated for both the gas phase and liquid phase flowing separately in the empty pipe. The pressure drop for the combined flow streams will then be determined using the method of Lockhart and Martinelli. Finally, the mixer pressure drop will be determined using the multiplier of the empty pipe pressure drop reported for the SMV mixer specified. 

Static mixing of gas—Hquid systems can provide good interphase contacting for mass transfer and heat transfer. Specific interfacial area for the SMV (Koch/Sulzer) mixer is related to gas velocity and gas holdup ( ) by the following ... 

Figure 3 Motionless mixers Chemineer HEV Sulzer/Koch SMV and SMX Chemineer Kenics.

For the Koch/Sulzer SMV in turbulent flow (Rcp > 2000), significant mixing continues to be achieved for several diameters downstream of the mixer. 

Equation 15 applies for viscosity ratios nB/nA <100 and shows that the mixing length to achieve a given CoV is 13 times shorter than for an empty pipe. To take advantage of the mixing downstream of the mixer, SMV elements are often spaced out in pairs in turbulent flow. The length of one element depends on the mixer diameter For mixer diameters <100 mm, the length of an element (LJ is equal to one pipe diameter, but for mixer diameters > 100 mm, Le = 0.5dp. 

For transitional flow, precise correlations are not available but for both SMV and Chemineer Kenics mixers, extra elements are required to achieve a certain degree of mixing. The SMV does not achieve significant mixing downstream of the mixer as in turbulent flow, so elements are not spaced out. The HEV is not recommended for transitional flow. 

More recent work (17) has covered viscous drops in turbulent flow, over a wide range of mixer types (SMV, SMX, SMXL, SMR, SMF), diameters (up to 80 mm), lengths, and dispersed-phase viscosities (up to 70 mPa) ... 

The constant has the numeric value of 64 for empty pipe, as is well known. The following numerical values apply for the static mixers whose characteristics are given in Fig. 8.5 Kenics 450 SMX (LP) 640 SMX (standard) 4000 and SMV 5600 Ross-ISG mixer 1.2 x IO. The pressure drop of these mixers is, in the laminar flow range, thus about a factor of 7 10 60 90 or 200 higher than in an empty pipe [416]. 

Kenics KM Kenics HEV Sulzer or Koch SMX Sulzer or Koch SMXL Sulzer or Koch SMV Ross LPD or LLPD Ross ISG Komax mixer Komax ulttamixer... 

In both experiments, the fuel-air mixture is prepared by separate injection of the reactants and in-line mixing using a proprietary static mixer (type SMV, Sulzer Co.). Other experiments have used this method with good results, but it is not seen as other than a convenience for the laboratory work. 

In the case of uniformly heated tubes, very high heat transfer coefficients have been obtained with the SMV Sulzer mixer (Fig. 11.27, curves i and j). Comparable heat transfer enhancement is also obtained with Kenics static mixers. 

Sulzer mixers in terms of the Newton number and other dimensionless groups defined in terms of hydraulic diameter (for the SMV element D,/D, %4.2)... 

Zalischevsky, G. D., Khutoryansky, F. M., Warsaw, O. M., Urivskii, G. M., Voronin, N. A. (2000). Pilot plant evaluation of the static mixer SMV type of firm Sulzer Hemiteh with desalting by CDU. Refining and Petrochemicals, 5, 16. 

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