4 replies to this topic

[alokjaiswal]

Prior to one year back, we were using Borewell water as Cooling water in our Ammonia-Urea complex. Now we have switched over to canal water for all the water requirement in the complex. Water requirement includes Process Water, Cooling Tower make-up water. The analysis of both types of water is attached for reference.
Earlier, we were using molybdate treatment for corrosion prevention in Cooling Tower.
My query is that whether can we stop using molybdate treatment in Cooling Tower for corrosion prevention at present with such Canal water analysis and switch over to some cheaper mode of corrosion inhibition.
To add more information, We have 14 nos. induced draft cross flow type cooling tower cells (total cooling water circulation capacity of 27130 m3/h.

Attached Files

•  Raw Water Analysis.xlsx   13.1KB   39 downloads

Edited by alokjaiswal, 28 January 2011 - 01:46 AM.

[breizh]

Hi ,
You should contact the Big guys dealing with water treatment like Nalco , GE Betz or others .
They should be able to advise , treament Phosphate based could be an option.
Breizh

[Capt.Pablo]

There are options to traditional methods of water treatment. You can contact me directly, as this is not a forum for advertising products.

In short though, the use of advanced technologies to develop and maintain dispersions allows you to carry a high TDS bulk solution. This high TDS solution, will naturally buffer out to a pH of 8.9 or so, providing the anti-corrosion qualities you seek. The persistent dispersion protects the system from scaling, along with inhibiting biological growth.

These systems are used throughout the world, and may be worth looking into if you are serious about improving the water quality and performance of your cooling tower water systems.

Prior to one year back, we were using Borewell water as Cooling water in our Ammonia-Urea complex. Now we have switched over to canal water for all the water requirement in the complex. Water requirement includes Process Water, Cooling Tower make-up water. The analysis of both types of water is attached for reference.
Earlier, we were using molybdate treatment for corrosion prevention in Cooling Tower.
My query is that whether can we stop using molybdate treatment in Cooling Tower for corrosion prevention at present with such Canal water analysis and switch over to some cheaper mode of corrosion inhibition.
To add more information, We have 14 nos. induced draft cross flow type cooling tower cells (total cooling water circulation capacity of 27130 m3/h.

[ahmedsoorma]

Please provide me with following:-
1. Total system volume.
2. Electricity Cost per Kwhr
3. System pressure for solenoid valve
4. Critical Heat Exchanger skin temperature
5. Maximum and minimum temperature drop across tower during summer and winter.
6. Is your tower working in a dusty environment?
7. What is cost of water per cubic meter charged to you while drawing from canal?
8. Has a grate or drum filter (or both) been installed at canal water intake and at pump suction end from tower basin?
This is to ensure foreign matter is not being circulated that will cause severe fouling in heat exchangers.
9. Do you have side stream filtration unit (5-7%) of recirculating water installed?
Based on your input, I can suggest parameters for you to operate in scaling zone. This is easier to cotrol than to treat for corrosion.The Ryznar Stability Index should be greater than 4 for such a treatment program.

Ahmed Soorma

[styx]

Molybdate is good for closed loop cooling water system. It is very expensive to use molybdate for an open recirculating system...you can use phosphate inhibitor as your corrosion inhibitor instead...