Impinging stream absorber

Figure 7.2 Two-impinging stream absorber for demonstrating enhancement.

Tamir et al. [109] also studied an impinging stream absorber operated in bubbling mode, as shown in Fig. 7.3. The absorber takes liquid as the continuous phase while gas is dispersed in liquid, so it actually belongs to liquid-continuous impinging streams (LIS). The experimental results obtained showed that this flow configuration exhibits a higher absorption rate than that shown in Fig. 7.2(a). Combining them with the results... 

Obviously, mass transfer coefficient is a topic of general interest. Tamir, Herskowits et at. [59, 106, 107, 109] studied experimentally the absorption of C02 and acetone into water in a two impinging stream absorber operated in various modes with various atomizers. The data they measured for the volumetric mass transfer coefficient are listed in Table 7.2, which are representative among earlier investigations. 

Volumetric mass transfer coefficient in two impinging stream absorber... 

As stated above, the key elements of a gas-continuous impinging stream absorber are the absorption chamber and the atomizers. 

Kitron, A., Elperin, T. and Tamir, A. (1991). Stochastic modeling of the effects of liquid droplets collisions in impinging stream absorbers and combustors. Inter. J. Multiphase Flow, 17 247-265. 

Tamir, A., Herskowits, D. (1985). Absorption of C02 in a new two impinging stream absorber. Chemical Engineering Science, 40 2149-2151. 

The adaptability of impinging streams to absorption systems and the features of the reactions involved in the wet desulfurization of flue gas with Ca(OH)2-suspension as the absorbent have been discussed in detail in Section 7.3. It is certain that the application of impinging streams for wet desulfurization is a good option. 

A pump is usually employed to transport the air sample along the sampling device, where the air stream Impinges on a solid surface (Impactors or adsorption tubes) or a solution (implngers) where the particles or gases settle. The solid use for impaction or adsorption and the absorbing solution are suited to the type of compound to be determined and to the nature of the sampled atmosphere. 

Impingement-plate-tower scrubbers have a number of horizontal plates or trays mounted in a tower. The gas stream is made to flow upwards, countercurrent against a downward flow of scrubbing liquid against which the desired aerosol particles and/or droplets are made to impact. The scrubbing liquid is usually an absorbent, or reactive, or solvent liquid. 

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