7 replies to this topic

[krasygan]

i have one questine in the exchanger condensate line operation

 

the process diagram is like in fig 1

 

 

1. what happen if we connect the condensate like in first case
 

2. what happen if we connect the condensate like in the second case( most shell and tube exchanger has like case)
 

the steam inlet pressure is 17kg/cm2

 

Attached Thumbnails

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[Zauberberg]

The way shown, the connection (and interdependence) of levels in the exchanger and the expansion vessel, would be lost. That defeats the purpose of process control scheme.

[DB Shah]

You are equalizing drum and steam pressure, in case-1 how will you lift the condensate above the drum level (what will be the driving force)

[krasygan]

the driving force for the condensate  will be the drum pressure

[DB Shah]

From drawing I understand that the condensate will be lifted at higher elevation than drum from exchanger, so if exchanger and drum pressure are same how will condensate travel from lower exchanger level to a height above drum height

[krasygan]

what u say i understand, thats why i have need clarification, the best condensate design is like in first fig or second one. or else can we reduce the riser height and not below the middle of the condensate pot. to have effective operation of the condensate

 

Edited by krasygan, 17 April 2013 - 02:25 AM.

[Zauberberg]

For the reasons mentioned above, the 2nd design is the only one that works.

[Art Montemayor]

Krasygan:

 

If you truly are trying to use a double pipe as a process heater, then you are going about it in the wrong manner.  One never uses the tube side of a double pipe heat exchanger as the steam side (where condensate is formed.  One always uses the shell side for the condensing steam.

 

Attached is a workbook showing how condensate is removed from a thermosyphon reboiler and from a double pipe steam heater.  That is way I and many others would pipe it up.  The reason(s) for doing it this way are many.

 

 Condensate Removal from Steam Heaters.xlsx   99.56KB   217 downloads