Baffle discs

Baffle cut. Baffles are used to direct the fluid stream across the tubes. The baffle cut is the height of the segment removed to form the baffle as a fraction of the baffle disc diameter. Baffle cuts from 0.15 to 0.45 are used. In conceptual design, a value of 0.25 can be assumed. 

That shown in Fig. 2.93, when fitted with flask and condenser, is suitable for extractions of about 10 ml of solution. The condensed solvent drops through the funnel and thence down through the solution and escapes via the side-arm sealed into the bottom of the extractor thimble. When assembling the apparatus it is advisable to pour a few millimetres of the extracting solvent into the thimble before pouring in the liquid to be extracted in this way contamination of the solvent in the flask by a carry-over of solution to be extracted is minimised. The apparatus shown in Fig. 2.94, when fitted with a flask and condenser, is suitable for the extraction of about 50 ml of aqueous solution the baffle discs improve the dispersion of solvent into droplets. Some of the solvent should be placed in the extraction vessel first, then the baffle plates and finally the aqueous solution further addition of solvent to prevent the passage of aqueous solution down the... 

Remove the oil baffle disc and front bearing inner race... 

To the hub will be attached any baffle discs or similar devices which the process needs. These are discussed in Section 2.4.6. 

The cake baffle disc was patented more than 15 years ago by the then Pennwalt/Sharples company [7]. It has been variously known as the Lee disc (after the inventor), a BD disc, biological disc or a baffle disc. Together with a negative ring dam (pond level higher than the cake discharge) it was known... 

The baffle disc can experience considerable axial forces, and thus a substantial thickness needs to be used with good welding where it crosses the flight. In some instances a dog-leg is used where the disc is attached to the flight. This can produce unwanted paddling of cake, by virtue of the axial component of the dog-leg. 

The baffle cone has the same function as the cake baffle disc. In place of the disc at the foot of the beach, a cone the full length of the beach or a shortened one at the foot is substituted. 

This disc is the same as the cake baffle disc but fitted close to the centrate discharge. It is only suited to the countercurrent decanter. 

The longitudinal baffle (9J perforins the same function as the cake baffle disc but in form Is a rectangular plate fitted, by welding, between two adjacent... 

In a dry solids decanter, there is generally a restriction, for example a baffle disc, against which the conveyor compresses the cake. Sometimes the cake discharge aperture forms the restriction or acts as an extra restriction in series... 

From the decanter data, various pertinent other data can be calculated such as holding volume downstream of the baffle disc, scaling factors such as Sigma, and maximum scrolling rates. 

A disc built onto the conveyor hub to baffle scrolled cake. Also known as a cake baffle Baffle disc... 

Fig. 8-10. Experimental sample collection vessel and trial baffle discs.

A version of the baffled collection vessel was fabricated from stainless steel for use at high pressure. This vessel is pictured in Fig. 8-12 and its construction detailed by Fig. 8-13. The sample collection vessel has been constructed to withstand a working pressure of up to 400 Bar (6000 psi) and contain up to 60 cm of fluid. The internal baffle discs allow the vessel to fill up from the bottom without too much mixing in order that much of the available volume is used. 

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