KETTLE TYPE REBOILER PDF

Reboilers are used to generate a flux of vapor to feed to a distillation tower; the vapor rises up the tower contacting a downwards-flowing liquid stream. A whole variety of forms of reboiler have been used in practice, some of which are described briefly below. General reviews of the forms and design of reboilers are given by McKee , by Ploughman and by Whalley and Hewitt Here, boiling takes place in the pool of liquid at the bottom of the tower, the heating fluid being inside the bundle of tubes as shown. The major problem with internal reboilers is the limitation imposed by the size of the distillation column. This limits the size of the reboiler.

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Reboilers are used to generate a flux of vapor to feed to a distillation tower; the vapor rises up the tower contacting a downwards-flowing liquid stream. A whole variety of forms of reboiler have been used in practice, some of which are described briefly below. General reviews of the forms and design of reboilers are given by McKee , by Ploughman and by Whalley and Hewitt Here, boiling takes place in the pool of liquid at the bottom of the tower, the heating fluid being inside the bundle of tubes as shown.

The major problem with internal reboilers is the limitation imposed by the size of the distillation column. This limits the size of the reboiler. Another problem sometimes encountered is that of mounting the bundle satisfactorily into the column. The problem of size restriction can be overcome if compact heat exchangers are used.

Thus, Plate-Fin Exchangers are used commonly as internal reboilers in the distillation towers of air separation plant. Another form of compact heat exchanger which has been used for this type of duty is the printed circuit heat exchanger which has an even higher heat transfer surface area per unit volume.

Liquid flows from the column into a shell in which there is a horizontal tube bundle, boiling taking place from the outside this bundle. The vapor passes back to the column as shown. Kettle reboilers are widely used in the petroleum and chemical industries; their main problems are that of ensuring proper disentrainment of liquid from the outgoing vapor and the problem of the collection of scale and other solid materials in the tube bundle region over long periods of operation.

The liquid passes from the bottom of the tower into the reboiler, with the evaporation taking place inside the tubes. The two-phase mixture is discharged back into the tower, where the liquid settles back to the liquid pool and the vapor passes up the tower as shown. The heating fluid typically condensing steam is on the outside of the tubes. The vertical thermosyphon reboiler is less susceptible to fouling problems and in general has higher heat transfer coefficients than does the kettle reboiler.

However, additional height is required in order to mount the reboiler. The heating fluid is inside the tubes. This design has the advantage of preserving the natural circulation concept while allowing a lower headroom than the vertical thermosyphon type.

However, there are more uncertainties about fouling and about the prediction of the crossflow heat transfer rates. McKee, H.

Palen, J. Section 3. Hemisphere Publishing Corporation, New York. Whalley, P. Library Subscription: Guest. DOI: Internal Reboilers. Kettle Reboilers. Vertical Thermosyphon Reboiler. Horizontal Thermosyphone Reboiler. References McKee, H.

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Select the Right Reboiler

Reboilers provide vapor for a distillation tower. They hold a boiling liquid pool on a tube bundle, either by level or use of an internal overflow weir. Vertical types may have the vaporization on either the tube-side, which is most common, or shell-side. Horizontal types nearly always have boiling on the shell-side.

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Distillation Part 2 – Reboilers

Reboilers are heat exchangers typically used to provide heat to the bottom of industrial distillation columns. They boil the liquid from the bottom of a distillation column to generate vapors which are returned to the column to drive the distillation separation. The heat supplied to the column by the reboiler at the bottom of the column is removed by the condenser at the top of the column. Proper reboiler operation is vital to effective distillation.

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