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Niagara Wet Surface Air Coolers (WSAC®) case study
Niagara WSAC for base load LNG liquefaction plants
LNG Plant / FLNG Operations
Location: Coastal locations
Application: Refrigerant condensing as part of the gas liquefaction process
The challengeTo obtain the coldest outlet temperatures possible in spite of warm climate regions and to increase production. Currently using dry air cooler technology.
The solution
An Alfa Laval Niagara Wet Surface Air Cooler is custom engineered to cool and condense to colder temperatures than those possible using dry air coolers.
Proposed improvements
A study* was done using Niagara Wet Surface Air Coolers versus dry air coolers.
• After 18 cases were ran, the cases with the lowest (2.8ºF) and highest (24ºF) difference between wet and dry bulb were chosen (ΔΔDT).
Case ΔΔDT
LNG Production Increase
HP Reduction
Increased Production Revenue
#6 2.8ºF 0.66% 2,200 BHP $535.2 MUSD
#13 24ºF 5.06% 19,950 BHP $4,184 MUSD
• The case results were applied to a 4 train 5 MTPA LNG plant, having a 20 year life-cycle, using $3.50/MMBtu of LNG and $1.50/MMBtu of feed gas.
• The increased production and HP reduction result in significant economic improvement, as shown above for a 20 year life-cycle.
What is a WSAC?
Alfa Laval Niagara Wet Surface Air Coolers (WSAC®) are efficient closed-loop, evaporative cooling systems designed for the power, process, wastewater, natural gas and petrochemical industries. These fluid cooling and vapor condensing systems are optimized for industrial applications where rugged designs, and cost-effective, efficient closed-loop cooling and condensing duties are required.
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Alfa Laval reserves the right to change specifications without prior notification.
Advantages Niagara Wet Surface Air Coolers (WSAC®) provide significant advantages versus dry air coolers in many applications.
• Latent thermal system
• Coldest practical process temperature
• Reduced power
• High cycles of concentration
• Low electrical consumption
• Low quality water can be used as makeup
• Plot space reduced by 20% to 60%
How to contact Alfa LavalContact details for all countries are continually updated on our website. Please visit www.alfalaval.com to access the information directly.
Alfa Laval NiagaraPhone +1 716-875-2000Email: [email protected]: www.niagarablower.com www.alfalaval.com/air
Required air cooler plot space
Required WSAC plot space
Before: Plot space using standard air coolers
After: *WSAC requires less plot space
* Publication: J.C. Kuo, P.E.a, Peter G Demakos, P.E.b. “Application of Hybrid Coolers for Base Load LNG Liquefaction Plant.” Proceedings of the 1st Annual Gas Processing Symposium. 10-12 January 2009. Doha, Qatar a Chevron, ETC b Niagara Blower Company
