1. Cooling Tower Blowdown Recovery using Thermal Desalination
A viable solution for water starved power plants to satisfy DM, service and potable water needs

2. Necessity of water reuse
Cooling water circuit should be maintained at a reasonable concentration to ensure that the condenser tubes are clean and operates as per design conditions.
To ensure concentration, a sizable portion has to be blown down and cleaner water should be made up
Becomes a problem for power plants that are in-land.
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

3. Pollution Control and Water Usage Norms
Central Pollution Control board states total dissolved solids that can be discharged to
A. inland surface waters,
B. public sewers,
C. on land for irrigation
should not exceed 2100 mg/l
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

4. MoEF Norms for Water Consumption
Period
Before 31 st December 2003
From 1st Jan 2004 to 31st Dec 2016
From 1st Jan 2017
Standard for water consumption
All plants with once through cooling to install cooling tower and have maximum specific water consumption of 3.5 m3/MWh
All existing cooling tower based plants to reduce specific water consumption to below 3.5 m3/MWh
New plants after 1st January 2017 to have maximum specific water consumption of 2.5 m3/MWh and achieve zero waste water discharged
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

5. Achievement of Standards
To achieve the standards set by the governmental agencies, it is becoming necessary to innovate and think of long term solutions that are economically and technologically feasible
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

6. Multi Effect Distillation
Mechanical equipment with minimal moving parts.
Simple construction and easy to maintain and operate
No pre treatment required.
Very minimal chemicals required ( Antiscalant of 2 ppm)
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

7. All the above are readily available in a power plant
Inputs required
Spent steam of 0.3 bar(a) pressure or 2 bar (a) bleed steam
Electricity to run 5 nos of pumps
Cooling tower blowdown water to cool the condenser of the MED and as make up to the MED
All the above are readily available in a power plant
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

8. Maximum Concentration possible
Flow Rate (kg/hr)
TDS (mg/l)
Ca++ (mg/l)
Total Salt (kg)
Input
1000
800
100
0.8
Brine
110.86
7200
900
Distillate
889.14 2 ~0
We are limited only by the concentration of the Calcium ions and sulphate ions in the blowdown water.
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

9. Water Recovery
80-90 % of blowdown water can be recovered depending on location of the plant.
This water is of high purity 2-5 ppm and can be used in the following applications.
Make up water to the boiler after passing through the existing DM plant.
Service Water
Potable Water – After remineralisation.
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

10. Brine discharge
Brine can be given as input to ZLD systems and solids can be collected and disposed off easily.
By using the MED, the load on the ZLD will be considerably reduced.
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

11. Steam Requirement Spent steam of 0.3 bar (a) at our battery limit
2 bar(a) from turbine bleed
10 bar(a) from turbine bleed - Recommended
Hot water of 90 deg C generated through a hot water generated utilising the heat of flue gas at the exhaust of ID fan.
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

12. System Description Multi effect Distillation – Evaporator Condenser
Preheaters
Pumps (Cooling Water, Brine Recirculation, Brine Blowdown, Distillate)
Valves
Piping
Vacuum system
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

13. Process Flow Diagram 31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

14. Advantages MED made of Duplex steel
Heat exchange tubes of MED made of Aluminium
Condenser and Preheater tubes made of Titanium
Tube to Tubesheet connection by Grommet. Prevents Galvanic corrosion.
Operates under vacuum. No high pressure pumps required.
Life of more than 25 years
Plant availability 95%
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

15. Techno economics Cost of water = ~ Rs. 100/m3
Detailed site specific techno economics are available on request.
Steam pressure available
Detailed chemical analysis of blowdown water.
Available sizes of MED – 150 m3/day to 500 m3/day
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

16. Desalination-Reference List
Completed Jobs
On – Going Contracts
S. No
Plant
Capacity
Location 1
MED – TVC
144 m3/day
RAMNAD, Tamilnadu 2
MED - TVC
240 m3/day
BARC, Mumbai
S. No
Plant
Capacity
Location 1
LTF - MED
120 m3/day
NTPC, Simhadri 2
Solar LTF -MED
IIT - 10 m3/day
Vivekananda Kendra, Kanyakumari
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

17. Company Profile Technology Partner - Water Edge Technologies, ITALY
Our Chairman Dr. Marco Rognoni is having a vast experience in Desalination for the Past 30 years.
He formerly served as the Founder and Director at SWS, ITALY
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

18. Manufacturing Facility
We have our own in-house Fabrication facilities with our Parent company GB Engineering Enterprises Pvt. Ltd., Trichy.
Our maximum Manufacturing capacity combined together Unit – I, II & III is 13,500 Tons / Year.
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

19. Reference Photos MED Fabricated at Shop – 144 m3/day
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

20. MED Internal – Tubesheet with hole provisions for Tubes
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

21. MED Internal – Typical Tubes arrangement in tubesheets
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

22. MED – TVC Plant Erected at site
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

23. MED-TVC Plant – 144 m3/day , RAMDAS Plant
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

24. MED-TVC Plant – 240 m3/day , BARC during Dispatch
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd

25. THANK YOU
31/03/2015 & 01/04/2016
GB Saline Water Solutions Pvt Ltd