Precautions to be taken in use of coil condensers :

Vapours should be passed through shell only.
Maximum pressure of coolant should be 2.7 bars.
Adequate flow of coolant should be used.
Steam should not be used in coils.
Coolant should not be heated to boiling point.
Coolant control valve should be turned slowly.
Coolant should be allowed to drain freely.
Brine can be used in coils in a closed circuit.
Water main should be connected with flexible hose.
Ensure no freezing of water remaining in the coils.
Condensers should be mounted vertically only.
Condensers can be mounted in series to provide larger surface area.

Methods of Use of Coil Condenser :

Vapours from bottom

This method is simple to install over a reactor. However this results in condensate returning substantially at its condensing temperature. In this method care must be taken that condensate is not excessive that it can lead to "logging" the coils and create back pressure in the system. Generally a reflux divider is used below the condenser to take out the distillate.

Vapors from top

This method produce a cool condensate using the entire coolinlg surface area. This method should be used where the condensate can lead to "logging" of coils.

BOILERS

Boilers are used for vaporization of liquids by passing the steam in the coils. Boilers are made by fusing number of parallel coils in a glass shell. In Boilers, coils are designed to provide bigger cross section in the shell side as compared to condensers. o The average heat transfer in Boilers is considered as 350 Kcal/m2,hr, C at a steam pressure of 3.5 bar.

Heat Exchanger - Coil Condenser

Details