7 replies to this topic

[K J]

normally cooling tower blow down either contineous or intermittent is done from cooling tower bottom. is it not possible to do it from cooling water return header so that blow down pumping to ETP power cost as well as pump Installation cost can be saved.

[fallah]

k.j.

 

The location of outgoing blow down is bottom of the cooling tower basin because the concentration of dissolved solids is at the highest value there among the whole loop due to fluid stagnant condition after evaporation in cooling tower...

[curious_cat]

normally cooling tower blow down either contineous or intermittent is done from cooling tower bottom. is it not possible to do it from cooling water return header so that blow down pumping to ETP power cost as well as pump Installation cost can be saved.

 

You can try doing a lab analysis of the dissolved solids etc. at both locations. A differential will be instructive. 

[breizh]

Hi ,

What you are describing is the way the Cooling water system I was operating ( 5000 m3/h capacity) was working a couple of years ago !

 

You should consult vendors and or water treatment company for 2nd opinion .

 

Breizh

Edited by breizh, 21 November 2013 - 08:25 PM.

[thorium90]

Im curious why a simple cooling tower blowdown from the tower bottom needs a pump. Isnt it already at the bottom? Or am i misunderstanding the problem?

[K J]

@ thorium  Actualy cooling tower blowdown done from basin bottom which goes to blowdown pit and from that with pump it goes to ETP. 

I have given basin bottom sample to check how much it is differing from circuilation header.

[K J]

ok basin blowdown and return header analysis is as

parameter         basin bottom       return header

PH                         7.0                       7.1

conductivity           1874                    1862

turbidity                 13                        10

TS                         1398                    1396

TH                          829                     792

chloride                  206                     225

silica                      128                      119

TDS                       1358                    1354

SS                         40                        42

As per cooling water treatmnet company treatment chemicals are dosed in supply header so direct blowdown from return header will be loss of that chemicals.

[breizh]

K.j .,

As stated earlier your proposal is fine to me, your system is well balanced !

 

Breizh